LU502521B1 - Anti-cracking construction process of crts i-type ballastless track concrete roadbed slab for tunnel - Google Patents
Anti-cracking construction process of crts i-type ballastless track concrete roadbed slab for tunnel Download PDFInfo
- Publication number
- LU502521B1 LU502521B1 LU502521A LU502521A LU502521B1 LU 502521 B1 LU502521 B1 LU 502521B1 LU 502521 A LU502521 A LU 502521A LU 502521 A LU502521 A LU 502521A LU 502521 B1 LU502521 B1 LU 502521B1
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- Prior art keywords
- construction joint
- construction
- roadbed slab
- lining
- inverted arch
- Prior art date
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Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/003—Arrangement of tracks on bridges or in tunnels
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/10—Making longitudinal or transverse sleepers or slabs in situ or embedding them
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The present invention provides an anti-cracking construction process of a CRTS Ⅰ-type ballastless track concrete roadbed slab for a tunnel. In the present invention, construction joints of a ballastless track roadbed slab and inverted arch and lining are arranged, which effectively avoids cracks of the roadbed slab caused by stress of uneven settlement on both sides of an inverted arch construction joint and stress of deformation of a lining construction joint, and the roadbed slab near the construction joint (also called a settlement expansion joint) is basically free of cracks. In the present invention, a row of cinch bolts near the construction joint are canceled, so that the concrete at the construction joint can freely expand and contract, and an expansion crack of the roadbed slab can be effectively prevented. After using the construction method of the present invention, the number of hundred-meter cracks is obviously reduced. The safety and quality of high-speed railway operation are ensured, the service life is prolonged, and he maintenance cost is reduced.
Description
ANTI-CRACKING CONSTRUCTION PROCESS OF CRTS I-TYPE BALLASTLESSU502521
[0001] 1. Technical Field
[0002] The present invention relates to the technical field of railway tunnel construction methods, and in particular to an anti-cracking construction process of a CRTS I-type double-block ballastless track concrete roadbed slab for a tunnel.
[0003] 2. Description of Related Art
[0004] There are many cracks in the concrete roadbed slab of a CRTS I-type double-block ballastless track for a high-speed railway tunnel, which is high in repair cost and poor in effect. The cracks in the process of "slapping" due to high-speed railway operation are enlarged, resulting in quality and safety hazards, and even being scrapped.
[0005] The roadbed slab is poured by blocks. Within 200 m of a tunnel portal, the roadbed slab has fewer parting cracks every 6.5 m, and the roadbed slab in a range of greater than 200 m away from the tunnel portal is parted every 13m. Inverted arch and lining are provided with a construction joint every 12 m, and the structural joint is 20 mm wide, filled with a closed-cell polyethylene plastic foam board and covered with a silicone sealing material. Before a silicone sealant is poured, an interface agent shall be evenly applied to both sides of the joint with a brush, and a row of cinch bolts are constructed on both sides of a sleeper. The construction method at present causes more cracks of the roadbed slab along the construction joint.
[0006] The present invention provides a CRTS I-type double-block ballastless track concrete roadbed slab construction structure for a tunnel. Specifically, every two sections of a roadbed slab in a range of more than 200 m away from a tunnel portal are as a group, with-bR@2521 group in a length of 24 m, and every 12 m of inverted arch and lining as a section, and an initial construction joint of the first section of roadbed slab is on the same vertical plane as the initial construction joint of the first section of inverted arch and lining; third construction joints of the roadbed slab, and the inverted arch and lining are on the same vertical plane, and the horizontal distance between a second construction joint of the roadbed slab and a second construction joint of the inverted arch and lining is 0-1 m; and by analogy, the odd-numbered construction joint of the roadbed slab is on the same vertical plane as the same odd-numbered construction joint of the inverted arch and lining, and the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0-1 m.
[0007] The present invention also provides an anti-cracking construction process of a CRTS I-type double-block ballastless track concrete roadbed slab for a tunnel. The specific method is as follows: during construction, every two sections of a roadbed slab in a range of more than 200 m away from a tunnel portal are as a group, with one group in a length of 24 m, and every 12 m of inverted arch and lining as a section; an initial construction joint of the first section of roadbed slab is on the same vertical plane as the initial construction joint of the first section of inverted arch and lining; the horizontal distance between a second construction joint of the roadbed slab and a second construction joint of the inverted arch and lining is 0-1 m, and third construction joints of the roadbed slab, and the inverted arch and lining are on the same vertical plane; and by analogy, the odd-numbered construction joint of the roadbed slab is on the same vertical plane as the same odd-numbered construction joint of the inverted arch and lining, and the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0-1 m.
[0008] The present invention has advantages that:
[0009] in the present invention, construction joints of a ballastless track roadbed slab-MP92521 inverted arch and lining are arranged, which effectively avoids cracks of the roadbed slab caused by stress of uneven settlement on both sides of an inverted arch construction joint and stress of deformation of a lining construction joint, and the roadbed slab near the construction joint (also called a settlement expansion joint) is basically free of cracks; in the present invention, a row of cinch bolts near the construction joint are canceled, so that the concrete at the construction joint can freely expand and contract, and an expansion crack of the roadbed slab can be effectively prevented. In the present invention, an anti-cracking net is disposed 3 cm below a concrete surface of the roadbed slab, so that a contraction crack of a concrete surface layer is effectively avoided, and temperature contraction spider cracks are few; fine aggregate concrete is adopted for surface concrete of the roadbed slab, which facilitates the close combination of concrete and a fine wire mesh; crushed stone and river sand are washed with water for dust removal, which facilitates full mixing and close combination of cement particles and other materials, and improves the strength of concrete, as well as the impermeability and crack resistance of concrete; after using the construction method of the present invention, the number of hundred-meter cracks is obviously reduced; and the safety and quality of high-speed railway operation are ensured, the service life is prolonged, and the maintenance cost is reduced.
[0010] FIG. 1 is a schematic layout diagram of a construction joint in a construction method of the present invention; and
[0011] FIG. 2 is an enlargement view of part A in FIG. 1.
[0012] The present invention will be further elaborated with reference to the following accompanying drawings and embodiments. It is to be pointed out that the following embodiments are intended to facilitate the understanding of the present invention, but have}#62521 limiting effect thereon.
[0013] Embodiment 1
[0014] As shown in FIGS. 1 and 2, the embodiment provides a CRTS I-type double-block ballastless track concrete roadbed slab construction structure for a high-speed railway tunnel. Specifically, a conventional construction structure (that is, a roadbed slab is provided with a construction joint every 6.5 m) is used within 200 m away from a tunnel portal.
[0015] Every two sections of the roadbed slab in a range of more than 200 m away from the tunnel portal are as a group, with each group in a length of 24 m, and every 12 m of inverted arch and lining as a section, and an initial construction joint of the first section of roadbed slab is on the same vertical plane as the initial construction joint of the first section of inverted arch and lining;
[0016] third construction joints of the roadbed slab, and the inverted arch and lining are on the same vertical plane, and the horizontal distance between a second construction joint of the roadbed slab and a second construction joint of the inverted arch and lining is 0-1 m; and
[0017] by analogy, the odd-numbered construction joint of the roadbed slab is on the same vertical plane as the same odd-numbered construction joint of the inverted arch and lining, and a horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0-1 m.
[0018] Preferably, the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0.3-0.5 m. In FIGS 1 and 2, a distance between the second or even-numbered construction joint of the roadbed slab and the second or even-numbered construction joint of the inverted arch and lining is 0.3 m, and the distance is adopted in ZWZQ-6 in the Hubei section of Zhengzhou-Chongqing High-speed Railway in Table 1.
[0019] On the basis of the above solution, no cinch bolt is disposed between each construction joint and the sleeper (as shown in FIG. 2, no cinch bolts are disposed on bdeR2521 sides of the construction joint).
[0020] Embodiment 2
[0021] On the basis of the structure in Embodiment 1, the embodiment provides an 5 anti-cracking construction process of a CRTS I-type double-block ballastless track concrete roadbed slab for a high-speed railway tunnel, which is specifically as follows:
[0022] during construction, every two sections of a roadbed slab in a range of more than 200 m away from a tunnel portal are as a group, with one group in a length of 24 m, and every 12 m of inverted arch and lining as a section, and an initial construction joint of the first section of roadbed slab is on the same vertical plane as the initial construction joint of the first section of inverted arch and lining; third construction joints of the roadbed slab, and the inverted arch and lining are on the same vertical plane, and the horizontal distance between a second construction joint of the roadbed slab and a second construction joint of the inverted arch and lining is 0-1 m; and by analogy, the odd-numbered construction joint of the roadbed slab is on the same vertical plane as the same odd-numbered construction joint of the inverted arch and lining, and the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0-1 m.
[0023] Within 200m of the tunnel portal, still in accordance with the previous construction method, the roadbed slab is parted every 6.5 m.
[0024] The construction joint is filled with a closed-cell polyethylene plastic foam board, and covered with a silicone sealing material. Before a silicone sealant is poured, an interface agent shall be evenly applied to both sides of the joint with a brush.
[0025] As a preferred solution, the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0.3-0.5 m.
[0026] On the basis of the above solution, a row of cinch bolts between each construdt#gR2521 joint and sleeper are canceled, so that the roadbed slab here becomes a free end of expansion and contraction of concrete internal stress.
[0027] On the basis of the above solution, an anti-cracking net (an iron wire or a steel wire is used) is disposed 3 cm below a concrete surface of the roadbed slab, and a coarse fine iron wire is adopted for the anti-cracking net to weave a 1 cm x 1 cm dense mesh net to increase the bonding degree and friction between the fine iron wire and concrete.
[0028] On the basis of the above solution, C4 fine aggregate concrete is adopted for surface (greater than 26 cm) concrete of the roadbed slab, and the mixing ratio of C40 concrete is: cement: fly ash: river sand: crushed stone: water: water reducing agent: anti-cracking compaction agent = 1: 0.25: 1.86: 2.78: 0.41: 0.012: 0.05, where the particle size of the crushed stone is 5-10 mm, the river sand is medium sand, and the crushed stone and the river sand are washed with water for dust removal. After construction, the average strength of the concrete reaches 42.5 MPa. The anti-cracking compaction agent used in the embodiment is a model CA854 anti-cracking compaction agent produced by New Manchester United (Beijing) Engineering Materials Technology Research Institute Co., Ltd.
[0029] According to the construction process of the present patent, there is a 0-1 m horizontal distance between the even-numbered construction joint (also called a settlement expansion joint) of the roadbed slab and the inverted arch and lining. Meanwhile, the anti-cracking net is combined with the fine aggregate concrete, so that the elastic deformation resistance of the concrete of the roadbed slab is improved. In addition, a row of cinch bolts between each construction joint and the sleeper are canceled, so that most of stress and deformation can be released. The construction joint (that is, the odd-numbered construction joint) of each group of roadbed slab is on the same vertical plane as the construction joint of the inverted arch and lining, so that not only is the elastic deformation resistance of this section improved, but also all the stress and deformation of this section and residual stress and deformation of the previous section are released. Therefore, the cracks are obviously redudéæf2521 the strength is improved, and the "flapping" resistance to high-speed railway operation is improved.
[0030] The construction method of Embodiment 1 of the present invention is used to conduct construction on tunnels of high-speed railways in mountainous areas of Hubei and Chongqing sections of Zhengzhou-Wanzhou High-speed Railway. Table 1 Statistics of Cracks of Roadbed Slab Serial Bid section Tunnel Number of Hundred-meter Construction method number roadbed slab cracks crack Length (Piece) Number (piece) (single line m 1 Zhengzhou-Wanzhou 28170 1014 3.6 An existing method in the Hubei section ZWZQ-5 technical background, that 1s, a general method for a design drawing 2 Zhengzhou-Wanzhou 58830 882 1.5 Implementation method of Hubei section ZWZQ-6 the present invention 3 Zhengzhou-Wanzhou 62348 2556 4.1 An existing method in the Hubei section ZWZQ-7 technical background, that 1s, a general method for a design drawing 4 Zhengzhou-Wanzhou 68070 3539 52 An existing method in the Hubei section ZWZQ-8 technical background, that 1s, a general method for a design drawing 5 Zhengzhou-Wanzhou 59268 2844 4.8 An existing method in the Hubei section ZWZQ-9 technical background, that 1s, a general method for a design drawing Zhengzhou-Wanzhou 57912 2258 3.9 An existing method in the Hubei section technical background, that ZWZQ-10 1s, a general method for a design drawing 7 Zhengzhou-Wanzhou 33142 2.1 30% of the tunnel length Chongqing section uses the existing method in ZWCQZQ-2 the technical background, that 1s, the general method for a design drawing, and 70% uses the implementation method of the present invention.
[0031] It is to be seen from Table 1, that there are many cracks in the roadbed slab after construction with the construction process in the prior art, but the cracks in the roadbed slab may be greatly reduced by using the method of the present invention.
[0032] After construction and track laying are conducted by using the method of the present invention, the design operation speed 350 km/h is reached.
Under a dynamic condH#5A2521 an inspection car automatically detects the TQI value of six bids of 1.47, which is 2.53 less than the requirement of 4.0 in the design specification of high-speed railway, and the effect is very obvious, as shown in Table 2. Table 2 Summary of TQI Values of Fine Adjustment of Tracks in Each Bid Section of Zhengzhou-Wanzhou Hubei Section and Chongqing Section in April 2022 Serial Bid section Jurisdiction TQI value number mileage Downwar | Downward Upward Upward | Averag d DJ601 reverse reverse DJ604 € DJ602 DJ603 Speed (KM/H) 1 Zhengzhou-Wanzhou 391-421 1.89 1.95 1.83 1.87 1.89 Hubei First sections ZWZQ-1~4 2 Zhengzhou-Wanzhou 421-429.72 1.66 1.71 1.66 1.72 1.69 Hubei section ZWZQ-4 0 connection 3 Zhengzhou-Wanzhou 429.720-46 1.75 1.8 1.67 1.7 1.73 Hubei section ZWZO-5 4.830 4 Zhengzhou-Wanzhou 464.830-50 1.47 1.52 1.42 1.47 1.47 Hubei section ZWZQ-6 0.464 5 Zhengzhou-Wanzhou 500.464-53 1.59 1.58 1.62 1.6 1.60 Hubei section ZWZQ-7 5.449 Zhengzhou-Wanzhou 535.449-57 1.52 14 1.58 1.42 1.48 Hubei section ZWZQ-8 1.451 7 Zhengzhou-Wanzhou 571.451-60 1.56 1.55 1.55 1.54 1.55 Hubei section ZWZQ-9 5.243 Zhengzhou-Wanzhou 605.243-62 Ten bid speed of 180 KM/H, not participating in appraisal Hubei section ZWZQ-10 1.782 Zhengzhou-Wanzhou K648+633. 1.48 1.51 1.42 1.46 1.47 Chongqing section 278- ZWCQZQ-2 K665+214. 428-
Claims (9)
1. A CRTS I-type double-block ballastless track concrete roadbed slab construction structure for a tunnel, wherein every two sections of a roadbed slab in a range of more than 200 m away from a tunnel portal are as a group, with each group in a length of 24 m, and every 12 m of inverted arch and lining as a section, and an initial construction joint of the first section of roadbed slab is on the same vertical plane as the initial construction joint of the first section of inverted arch and lining; third construction joints of the roadbed slab, and the inverted arch and lining are on the same vertical plane, and a horizontal distance between a second construction joint of the roadbed slab and a second construction joint of the inverted arch and lining is 0-1 m; and by analogy, the odd-numbered construction joint of the roadbed slab is on the same vertical plane as the same odd-numbered construction joint of the inverted arch and lining, and the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0-1 m.
2. The CRTS I-type double-block ballastless track concrete roadbed slab construction structure for a tunnel according to claim 1, wherein the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0.3-0.5 m.
3. The CRTS I-type double-block ballastless track concrete roadbed slab construction structure for a tunnel according to claim 1, wherein no cinch bolt is disposed between each construction joint and sleeper.
4. An anti-cracking construction process of a CRTS I-type double-block ballastless track concrete roadbed slab for a tunnel, wherein the specific method is as follows: during construction, every two sections of a roadbed slab in a range of more than 200 m away from a tunnel portal are as a group, with one group in a length of 24 m, and every 12 m of inverted arch and lining as a section; LUS02521 an initial construction joint of the first section of roadbed slab 1s on the same vertical plane as the initial construction joint of the first section of inverted arch and lining; the horizontal distance between a second construction joint of the roadbed slab and a second construction joint of the inverted arch and lining is 0-1 m, and third construction joints of the roadbed slab, and the inverted arch and lining are on the same vertical plane; and by analogy, the odd-numbered construction joint of the roadbed slab is on the same vertical plane as the same odd-numbered construction joint of the inverted arch and lining, and the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0-1 m.
5. The process according to claim 4, wherein the horizontal distance between the even-numbered construction joint of the roadbed slab and the same even-numbered construction joint of the inverted arch and lining is 0.3-0.5 m.
6. The process according to claim 4, wherein during construction, a row of cinch bolts between each construction joint and sleeper are canceled.
7. The process according to claim 4, wherein an anti-cracking net is disposed 3 cm below a concrete surface of the roadbed slab.
8. The process according to claim 4, wherein C4 fine aggregate concrete is adopted for surface concrete of the roadbed slab, and the mixing ratio of C40 concrete is: cement: fly ash: river sand: crushed stone: water: water reducing agent: anti-cracking compaction agent = 1: 0.25: 1.86: 2.78:
0.41: 0.012: 0.05, wherein the particle size of the crushed stone is 5-10 mm, the river sand is medium sand, and the crushed stone and the river sand are washed with water for dust removal.
9. The process according to claim 4, wherein the construction joint is filled with a closed-cell polyethylene plastic foam board, and covered with a silicone sealing material, and before a silicone sealant is poured, an interface agent is evenly applied to both sides of the joint with a brush.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210717475.7A CN114941258B (en) | 2022-06-23 | 2022-06-23 | Anti-cracking construction method for CRTS I type double-block ballastless track concrete track slab of high-speed railway tunnel |
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| Publication Number | Publication Date |
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| LU502521B1 true LU502521B1 (en) | 2023-01-19 |
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| LU502521A LU502521B1 (en) | 2022-06-23 | 2022-07-19 | Anti-cracking construction process of crts i-type ballastless track concrete roadbed slab for tunnel |
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| LU (1) | LU502521B1 (en) |
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| CN117127440B (en) * | 2023-10-27 | 2024-03-12 | 中国铁路设计集团有限公司 | Double-block ballastless track structure of railway tunnel and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2639878B2 (en) * | 1993-03-05 | 1997-08-13 | 鹿島建設株式会社 | Shield tunnel with secondary lining |
| AT409641B (en) * | 1999-04-13 | 2002-09-25 | Porr Allg Bauges | Ballastless superstructure with prefabricated concrete support plates as well as a procedure for the replacement of the same |
| CN202194031U (en) * | 2011-05-04 | 2012-04-18 | 中铁第一勘察设计院集团有限公司 | Large unit type track plate for ballastless tracks |
| CN103603236A (en) * | 2013-11-06 | 2014-02-26 | 中铁四局集团有限公司 | Method for controlling cracks of double-block type ballastless track bed slabs |
| JP6257398B2 (en) * | 2014-03-19 | 2018-01-10 | キヤノン株式会社 | Image forming apparatus |
| CN106868959B (en) * | 2017-03-17 | 2018-10-12 | 中铁三局集团有限公司 | A kind of method that high ferro non-fragment orbit circuit is quickly repaired |
| CN107988852B (en) * | 2017-11-27 | 2019-06-11 | 中交隧道工程局有限公司 | The III new structural construction method of plate-type non-fragment orbit of tunnel location CRTS |
| CN108952754A (en) * | 2018-09-12 | 2018-12-07 | 中铁二局第工程有限公司 | A kind of lining-up construction joint anticracking bridging arrangement and construction method |
| CN109667602A (en) * | 2018-11-28 | 2019-04-23 | 中铁隧道局集团有限公司 | For preventing the construction method of concrete capping at two lining circular construction joints |
| CN209637782U (en) * | 2019-02-20 | 2019-11-15 | 中铁隧道局集团有限公司 | Tunnel water proofing discharge structure |
| CN110617077B (en) * | 2019-09-20 | 2021-03-30 | 中铁十八局集团有限公司 | Construction method for preventing floor heave of tunnel bottom inverted arch |
| CN111270565A (en) * | 2020-03-03 | 2020-06-12 | 中铁二十二局集团轨道工程有限公司 | Ballastless track in high-speed rail turnout area and anti-cracking construction method thereof |
| CN111576106A (en) * | 2020-05-18 | 2020-08-25 | 重庆交通大学 | Construction method for rapidly pushing and replacing ballastless track structure of passenger special line |
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| CN114941258A (en) | 2022-08-26 |
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