CN114000378A - Shield tunnel and prefabricated vibration reduction type back cover segment thereof - Google Patents
Shield tunnel and prefabricated vibration reduction type back cover segment thereof Download PDFInfo
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- CN114000378A CN114000378A CN202111150416.8A CN202111150416A CN114000378A CN 114000378 A CN114000378 A CN 114000378A CN 202111150416 A CN202111150416 A CN 202111150416A CN 114000378 A CN114000378 A CN 114000378A
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- 230000009467 reduction Effects 0.000 title claims abstract description 50
- 238000009434 installation Methods 0.000 claims abstract description 7
- 238000013016 damping Methods 0.000 claims description 144
- 238000007789 sealing Methods 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000007667 floating Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Vibration Dampers (AREA)
Abstract
The invention discloses a shield tunnel and a prefabricated vibration reduction type back cover segment thereof. The prefabricated vibration reduction type back cover duct piece is positioned at the bottom of the circular ring-shaped tunnel and used for supporting a track bed and comprises a circular arc back cover duct piece body, wherein splicing installation parts are symmetrically arranged on two sides of the inner arc surface of the back cover duct piece body, the track bed is arranged along the chord line of the back cover duct piece body, a vibration reduction groove is formed in the inner arc surface of the back cover duct piece body, which is opposite to the track bed, a vibration reduction pad is arranged in the vibration reduction groove, and the thickness of the vibration reduction pad is larger than the groove depth of the vibration reduction groove; the track bed is of a prefabricated structure, and the lower surface of the track bed is directly supported on the upper portion of the back cover segment body through the vibration reduction pad. Therefore, the prefabricated vibration reduction type back cover segment can attenuate vibration generated by train operation in the tunnel, and can reduce the influence of train operation on resident life and ancient buildings along the line.
Description
Technical Field
The invention relates to the field of rail transit vibration control, in particular to a shield tunnel and a prefabricated vibration reduction type back cover segment thereof.
Background
The large-scale construction of urban rail transit can effectively promote the current convenience of resident, but also can arouse certain structure and environmental problem. For example, the vibration of urban rail transit environment not only affects the daily life of residents, but also can cause the destruction of ancient building structures. With the increase of attention of people, the control of the environmental vibration of urban rail transit becomes one of the hot scientific problems in the field of urban rail transit.
The vibration reduction measures adopted in the field of rail transit at present are as follows: (1) rail dampers, such as those disclosed in chinese patent 202011069737.0; (2) vibration damping fasteners such as the rail vibration damping fastener described in chinese patent application 201510606515.0; (3) vibration-damping sleepers, such as those disclosed in chinese patent application 202110256896. X; (4) a floating deck track such as that disclosed in chinese patent application 202010067266.3. Among them, the point-supported floating deck rails are considered to have the best vibration damping effect, such as rubber floating deck rails and steel spring floating deck rails. At present, no main body-segment structure of the shield tunnel is designed, so that the shield tunnel has a vibration reduction function.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a prefabricated vibration reduction type back cover segment, which is characterized in that a prefabricated track bed is directly arranged above an arc-shaped segment (back cover segment) at the bottom position of a shield tunnel through a vibration reduction pad, namely the support of the prefabricated track bed only depends on the vibration reduction pad arranged on the inner arc surface of the back cover segment, so that the vibration generated by the running of a train can be transmitted along with the prefabricated track bed, and further the vibration reduction is realized through the vibration reduction pad arranged between the track bed and the back cover segment, so that the upper part vibration is blocked in the downward transmission path.
The purpose of the invention can be realized by the following technical scheme:
a prefabricated vibration reduction type back cover segment is positioned at the bottom of a circular ring-shaped tunnel and used for supporting a track bed and comprises an arc-shaped back cover segment body, wherein abutted seam installation parts are symmetrically arranged on two sides of the inner arc surface of the back cover segment body, the track bed is arranged along the chord line of the back cover segment body, a vibration reduction groove is formed in the inner arc surface of the back cover segment body, which is opposite to the track bed, a vibration reduction pad is arranged in the vibration reduction groove, and the thickness of the vibration reduction pad is larger than the depth of the vibration reduction groove; the track bed is of a prefabricated structure, the lower surface of the track bed is directly supported on the upper portion of the back cover segment body through the vibration reduction pads, and meanwhile, a gap meeting engineering requirements exists between the two transverse ends of the track bed and the inner arc surface of the back cover segment body.
Preference is given toThe vibration damping pad is arranged in the vibration damping groove in a scattered point shape, a strip shape or a sheet shape, the thickness of the vibration damping pad is 40-70 mm, the vibration damping pad is made of polyurethane, and the elastic modulus is 1-10 x 106Pa, density of 1000-2000 kg--3。
Preferably, when the vibration damping pads are distributed in the vibration damping grooves in a scattered manner, each scattered vibration damping pad is distributed on the inner arc surface of the back cover segment body in a rectangular array manner, and the distance between two adjacent scattered vibration damping pads in the circumferential direction and the lower arc length L of the scattered vibration damping pads in the circumferential direction are equal toLower partAnd the distance between two adjacent scattered vibration damping pads in the longitudinal direction is consistent with the longitudinal length of the scattered vibration damping pads.
Preferably, each discrete vibration-damping pad has a longitudinal length of 200mm and an upper arc length L in a circumferential directionOn the upper partLower arc length LLower partAre calculated by the following formulas, respectively:
wherein R isBallast bedRadius, R, of the lower bottom surface of the ballast bedTroughIs the radius of the cambered surface of the damping groove.
Preferably, when the damping pads are arranged in a strip shape inside the damping groove, the longitudinal length of each strip-shaped damping pad is matched with the longitudinal length of the damping groove, and the upper arc length L in the circumferential directionOn the upper partLower arc length LLower partAre calculated by the following formulas, respectively:
wherein R isBallast bedRadius, R, of the lower bottom surface of the ballast bedTroughIs the radius of the cambered surface of the damping groove.
Preferably, when the vibration damping pad is arranged in the vibration damping groove in a sheet shape, the longitudinal length of the sheet-shaped vibration damping pad is matched with that of the vibration damping groove, and the lower arc length of the sheet-shaped vibration damping pad in the annular direction is matched with that of the vibration damping groove in the annular direction.
Preferably, the track bed is a prefabricated structure made of C35 reinforced concrete and has an elastic modulus of 3.15 x 1010Pa, Poisson's ratio of 0.2, density of 2400 kg--3
Preferably, the vibration reduction groove is embedded in the inner arc surface of the bottom sealing segment body, two ends of the vibration reduction groove are communicated with a circular seam generated by assembling a tunnel, and the depth of the vibration reduction groove is 20-50 mm; the thickness of the bottom sealing segment body is 400-450 mm, and the longitudinal width of the bottom sealing segment body is 1200-1500 mm; the inner reinforcing steel bars of the bottom sealing segment body below the vibration reduction groove are encrypted.
Preferably, the piece joint installation part comprises a circular joint hand hole and a longitudinal joint hand hole, wherein a circular joint bolt hole is formed in the circular joint hand hole, and a longitudinal joint bolt hole is formed in the longitudinal joint hand hole.
The invention also aims to provide a shield tunnel which is of an assembled structure and comprises a plurality of ring pipe pieces which are arranged along the longitudinal direction, each ring pipe piece is formed by splicing more than two arc pipe pieces along the circumferential direction, and the arc pipe piece positioned at the bottom in each ring pipe piece is the prefabricated vibration reduction type bottom sealing pipe piece.
Has the advantages that:
compared with the prior art, the vibration reduction groove is arranged in the intrados ballast bed range of the duct piece, the vibration reduction pad is arranged in the vibration reduction groove, and when vibration generated by an upper train is transmitted to the vibration reduction pad, the vibration reduction purpose can be realized according to the damping effect of the material of the vibration reduction pad and the supporting characteristic formed by the vibration reduction pad and the ballast bed. Therefore, the invention has the following beneficial effects:
(1) so that the duct piece has a vibration reduction function;
(2) compared with vibration reduction of a floating slab track, the height of a track foundation structure is not increased, and utilization of limited space in a tunnel is facilitated.
Drawings
FIG. 1 is a schematic structural view of a first prefabricated vibration damping type back cover segment (vibration damping pads are in a scattered state) according to the present invention;
FIG. 2 is a schematic structural view of a second prefabricated vibration damping type back cover segment (vibration damping pad in the form of a strip) according to the present invention;
FIG. 3 is a schematic structural view of a third prefabricated vibration damping back-cover segment (vibration damping pad in sheet form) according to the present invention;
in fig. 1 to 3: a vibration damping tank 1; a vibration damping pad 2; a ballast bed 3; circularly sewing a hand hole 4; circumferential seam bolt holes 5; a longitudinal hand sewing hole 6; longitudinal seam bolt holes;
FIG. 4a is a schematic diagram of a dynamic analysis of a finite element model when vibration-damping pads are distributed in a scattered manner;
FIG. 4b is a schematic diagram of a dynamic analysis of a finite element model with damping pads arranged in strips;
FIG. 4c is a schematic diagram of a finite element model dynamics analysis when the damping pads are distributed in a sheet shape;
FIG. 5a is a cloud chart of vibration acceleration of the duct piece and the vibration-damping pad extracted when the vibration-damping pads are distributed in a scattered manner;
FIG. 5b is a cloud chart of vibration acceleration of the duct piece and the vibration-damping pad extracted when the vibration-damping pads are distributed in a strip shape;
FIG. 5c is a cloud chart of vibration acceleration of the duct piece and the vibration-damping pad extracted when the vibration-damping pads are distributed in a sheet shape;
fig. 6 is a comparison graph of damping effect in the case of three types of damping pads distributed (scattered points, strips, sheets).
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1 to 3, the prefabricated vibration damping type back cover segment of the present invention is a part of the main structure of a shield tunnel, is located at the bottom of an annular shield tunnel, and is used for supporting a track bed, and includes an arc-shaped back cover segment body, wherein the inner arc surface of the back cover segment body is symmetrically provided with seam splicing installation parts at two sides, the track bed is arranged along the chord line of the back cover segment body, the back cover segment body is provided with a vibration damping groove at the inner arc surface opposite to the track bed, a vibration damping pad is arranged in the vibration damping groove, and the thickness of the vibration damping pad is greater than the depth of the vibration damping groove; the track bed is of a prefabricated structure, the lower surface of the track bed is directly supported on the upper portion of the back cover segment body through the vibration reduction pad, and a gap meeting engineering requirements exists between the two transverse ends of the track bed and the inner arc surface of the back cover segment body. Therefore, the support of the prefabricated track bed only depends on the damping pads arranged on the inner cambered surfaces of the back cover segments, and the vibration transmission process generated by the running of a train is as follows:
in short, the vibration generated by the train running of the invention can be transmitted along with the prefabricated track bed, and then is damped by the damping pad positioned between the track bed and the back cover segment, so that the upper vibration is blocked in the downward transmission path.
Based on the prefabricated vibration reduction type back cover segment, the invention can provide a shield tunnel with a new configuration, the shield tunnel is of an assembled structure and comprises a plurality of ring pipe pieces which are longitudinally arranged, each ring pipe piece is formed by splicing more than two arc-shaped pipe pieces along the circumferential direction, and the structure of the arc-shaped pipe piece at the bottom in each ring pipe piece is consistent with that of the prefabricated vibration reduction type back cover segment. Specifically, in order to realize the splicing of each arc-shaped duct piece in the longitudinal direction and the circumferential direction, the two sides of the inner arc surface of each arc-shaped duct piece are symmetrically provided with the splicing installation parts, each splicing installation part comprises a circular seam hand hole and a longitudinal seam hand hole, a circular seam bolt hole is arranged in each circular seam hand hole, and a longitudinal seam bolt hole is arranged in each longitudinal seam hand hole. When in annular assembly, the annular seam bolt holes correspondingly arranged between two adjacent arc-shaped pipe pieces are spliced into a whole by bolts one by one, so that the annular pipe pieces are formed; and when the shield tunnel is longitudinally assembled, the longitudinal seam bolt holes correspondingly arranged between two adjacent ring segments are spliced into a whole by bolts one by one, so that the shield tunnel is obtained.
Hereinafter, 3 embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the prefabricated vibration damping type back cover segment according to this embodiment is a part of the main structure of the shield tunnel, and is located at the bottom of the circular tunnel. Including circular-arc back cover section of jurisdiction body, damping groove 1 has been seted up to the intrados of back cover section of jurisdiction body, and there is damping pad 2 damping groove 1 inside, and damping pad 2 upper portion is ballast bed 3. The two sides of the inner arc surface of the back cover segment body are symmetrically provided with a circular seam hand hole 4 and a longitudinal seam hand hole 6, a circular seam bolt hole 5 is arranged in the circular seam hand hole 4, and a longitudinal seam bolt hole is arranged in the longitudinal seam hand hole 6.
The material of the vibration damping pad is selected to be polyurethane because the polyurethane has a smaller elastic modulus and a larger damping ratio than the material of the duct piece, namely rubber concrete, and is more favorable for damping vibration waves.
The vibration damping pads 2 are distributed at the middle positions of the inner arc surfaces of the back cover segment body in a scattered manner and are right opposite to the ballast bed 3 on the upper portion, each scattered vibration damping pad is arranged on the inner arc surface of the back cover segment body in a rectangular array manner, the distance between two adjacent scattered vibration damping pads in the circumferential direction and the lower arc length L of the scattered vibration damping pads in the circumferential directionLower partAnd the distance between two adjacent scattered vibration damping pads in the longitudinal direction is consistent with the longitudinal length of the scattered vibration damping pads.
Specifically, the longitudinal length of the scattered vibration damping pad is 200mm, and the two are annular upper and lowerArc length L of stripOn the upper part、LLower partCalculated from the following formula:
wherein R isBallast bedRadius, R, of the lower bottom surface of the ballast bedTroughIs the radius of the cambered surface of the damping groove 1.
The longitudinal arrangement distance of the scattered vibration-damping pad 2 is 200mm, and the vertical distance from the circular seam is 100 mm.
The circumferential arrangement distance of the scattered vibration-damping pads 2 is consistent with the lower arc length.
And (3) vibration transmission process: the method comprises the steps of running a train, generating train excitation force, exciting vibration of a track bed structure 3, transmitting vibration acceleration to a vibration damping pad 2, damping vibration damping of the vibration damping pad, damping vibration acceleration and realizing vibration damping.
Example 2
The difference between this embodiment and embodiment 1 lies in the arrangement of the damping pad on the intrados of the back cover segment body, specifically, as shown in fig. 2, in this embodiment, the damping pad is arranged inside the damping groove in a strip shape, and the longitudinal length of each strip-shaped damping pad matches with the longitudinal length of the damping groove, and the longitudinal length of the strip-shaped damping pad in this embodiment is 3600mm, runs through the segment longitudinally, and is in the circumferential upper arc length LOn the upper partLower arc length LLower partAre calculated by the following formulas, respectively:
wherein R isBallast bedRadius, R, of the lower bottom surface of the ballast bedTroughIs the radius of the cambered surface of the damping groove.
Other parts of this embodiment are substantially the same as embodiment 1, and are not described herein again.
Example 3
The difference between this embodiment and embodiment 1 lies in the arrangement of damping pad at the intrados of back cover segment body, specifically, as shown in fig. 3, in this embodiment, the damping pad is the slice and arranges inside the damping groove, and the longitudinal edge section of jurisdiction of slice damping pad vertically runs through, and the hoop length is unanimous with the arc length in damping groove 1.
Other parts of this embodiment are substantially the same as embodiment 1, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Aiming at different damping requirements, different damping pad structures are adopted, and the damping pad structure is as follows:
(1) in the scene of more than 10dB of vibration needs to be attenuated, a sheet-shaped vibration damping pad is suggested.
(2) In the scene of needing to attenuate vibration above 15dB, a strip-shaped vibration damping pad is suggested.
(3) In the scene of more than 20dB of vibration needs to be attenuated, scattered vibration damping pads are suggested.
In order to compare the damping effect of the three damping pads under the actual train running condition, a finite element model is established for dynamic analysis, and the calculation models of the three damping pads are shown in fig. 4a, 4b and 4 c.
And extracting a vibration acceleration cloud chart of the duct piece and the vibration reduction pad, so that the distribution condition of the vibration acceleration in the model can be obtained. As shown in fig. 5a, 5b and 5c, it can be seen that the damping cushion layer can effectively isolate the vibration transmitted from the upper track bed, so that the vibration acceleration of the segment portion is attenuated, and a good damping function is realized.
To further compare the damping effect of the three damping pads, the vibration acceleration at different frequencies at a specific point on the tube sheet was extracted as shown in fig. 6. The vibration acceleration peak value is known as follows: flake > strip > scatter. Therefore, the vibration damping effect is as follows: scattered points > strips > sheets.
Claims (10)
1. A prefabricated vibration damping type back cover segment is positioned at the bottom of a circular ring-shaped tunnel and used for supporting a track bed (3), and comprises an arc-shaped back cover segment body, wherein abutted seam installation parts are symmetrically arranged on the two sides of the inner arc surface of the back cover segment body, and the track bed (3) is arranged along the chord line of the back cover segment body; the track bed (3) is of a prefabricated structure, the lower surface of the track bed (3) is directly supported on the upper portion of the back cover segment body through the vibration reduction pads (2), and gaps meeting engineering requirements exist between the inner arc surfaces of the track bed (3) at the two transverse ends and the back cover segment body.
2. The prefabricated vibration-damping type back cover segment as claimed in claim 1, wherein the vibration-damping pads (2) are arranged in the vibration-damping grooves (1) in a scattered point shape, a strip shape or a sheet shape, the thickness of the vibration-damping pads (2) is 40-70 mm, the vibration-damping pads are made of polyurethane, and the elastic modulus of the vibration-damping pads is 1-10 x 106Pa, density of 1000-2000 kg--3。
3. The prefabricated vibration damping type back cover segment as claimed in claim 2, wherein when the vibration damping pads (2) are arranged in a scattered manner inside the vibration damping grooves (1), each scattered vibration damping pad is arranged on the inner arc surface of the back cover segment body in a rectangular array manner, and the distance between two adjacent scattered vibration damping pads in the circumferential direction and the lower arc length L of the scattered vibration damping pad in the circumferential directionLower partAnd the distance between two adjacent scattered vibration damping pads in the longitudinal direction is consistent with the longitudinal length of the scattered vibration damping pads.
4. A prefabricated vibration damping back cover segment as defined in claim 3 wherein each discrete vibration damping pad (2) has a longitudinal length of 200mm and an upper arc length in a circumferential directionLOn the upper partLower arc length LLower partAre calculated by the following formulas, respectively:
wherein R isBallast bedRadius, R, of the lower bottom surface of the ballast bedTroughIs the radius of the cambered surface of the vibration reduction groove (1).
5. A prefabricated vibration damping back cover segment as defined in claim 2, wherein when the vibration damping pads (2) are arranged in the form of strips inside the vibration damping groove (1), the longitudinal length of each strip matches the longitudinal length of the vibration damping groove (1), and the upper arc length L in the circumferential direction is the same as the upper arc length L in the circumferential directionOn the upper partLower arc length LLower partAre calculated by the following formulas, respectively:
wherein R isBallast bedRadius, R, of the lower bottom surface of the ballast bedTroughIs the radius of the cambered surface of the vibration reduction groove (1).
6. The prefabricated vibration damping type back cover segment as claimed in claim 2, wherein when the vibration damping pads (2) are arranged inside the vibration damping grooves (1) in a sheet shape, the longitudinal length of the sheet-shaped vibration damping pads is matched with that of the vibration damping grooves (1), and the lower arc length of the sheet-shaped vibration damping pads in the circumferential direction is matched with that of the vibration damping grooves (1) in the circumferential direction.
7. According toThe prefabricated vibration damping back-cover segment as defined in claim 1, wherein said track bed (3) is of prefabricated construction and is made of C35 reinforced concrete with an elastic modulus of 3.15 x 1010Pa, Poisson's ratio of 0.2, density of 2400 kg--3
8. The prefabricated vibration-damping type back cover segment as claimed in claim 1, wherein the vibration-damping groove (1) is embedded in the inner arc surface of the back cover segment body, two ends of the vibration-damping groove (1) are communicated with a circular seam generated by assembling a tunnel, and the depth of the vibration-damping groove (1) is 20-50 mm; the thickness of the bottom sealing segment body is 400-450 mm, and the longitudinal width of the bottom sealing segment body is 1200-1500 mm; the inner steel bars of the bottom sealing segment body below the vibration reduction groove (1) are encrypted.
9. The prefabricated vibration damping type back cover segment as claimed in claim 1, wherein the abutted seam mounting portion comprises a circular seam hand hole and a longitudinal seam hand hole, a circular seam bolt hole is formed in the circular seam hand hole, and a longitudinal seam bolt hole is formed in the longitudinal seam hand hole.
10. A shield tunnel is a split mounting type structure, which comprises a plurality of ring pipe pieces arranged along the longitudinal direction, each ring pipe piece is formed by splicing more than two arc-shaped pipe pieces along the circumferential direction, and the shield tunnel is characterized in that the arc-shaped pipe piece at the bottom in each ring pipe piece is the prefabricated vibration reduction type back cover pipe piece of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111150416.8A CN114000378A (en) | 2021-09-29 | 2021-09-29 | Shield tunnel and prefabricated vibration reduction type back cover segment thereof |
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| CN202111150416.8A CN114000378A (en) | 2021-09-29 | 2021-09-29 | Shield tunnel and prefabricated vibration reduction type back cover segment thereof |
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| CN210033456U (en) * | 2019-03-25 | 2020-02-07 | 河北冀科工程项目管理有限公司 | Shield constructs underground transportation system sleeper shock attenuation anticreep rail and prevents damaged device of section of jurisdiction |
| CN210509200U (en) * | 2019-07-13 | 2020-05-12 | 常州中铁蓝焰构件有限公司 | Novel high-strength concrete tunnel segment |
| CN210460683U (en) * | 2019-08-13 | 2020-05-05 | 佛山市南海商邦混凝土构件有限公司 | Wear-resisting shield constructs section of jurisdiction for subway |
| CN111425211A (en) * | 2020-03-13 | 2020-07-17 | 中国水利水电科学研究院 | Stacked multilayer rubber bag sealing structure capable of meeting large-gap requirement and using method thereof |
| CN111395074A (en) * | 2020-03-25 | 2020-07-10 | 江苏锡沂钢模有限公司 | Storage battery car runway sleeper for shield tunnel construction |
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