CN114941258A - Anti-cracking construction method for concrete track bed slab of CRTS I type double-block ballastless track of high-speed railway tunnel - Google Patents
Anti-cracking construction method for concrete track bed slab of CRTS I type double-block ballastless track of high-speed railway tunnel Download PDFInfo
- Publication number
- CN114941258A CN114941258A CN202210717475.7A CN202210717475A CN114941258A CN 114941258 A CN114941258 A CN 114941258A CN 202210717475 A CN202210717475 A CN 202210717475A CN 114941258 A CN114941258 A CN 114941258A
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- construction
- lining
- track bed
- inverted arch
- concrete
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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
- E01B2/00—General structure of permanent way
- E01B2/003—Arrangement of tracks on bridges or in tunnels
-
- 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
-
- 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
Abstract
The invention provides a novel construction structure and a construction method for a CRTS I type double-block ballastless track concrete track bed slab of a high-speed railway tunnel. The invention cancels a row of expanding anchor bolts near the construction joint, realizes the free expansion of concrete at the construction joint and effectively prevents the expansion crack of the track bed slab. The construction method of the invention can obviously reduce the number of hundreds of meters of cracks. The operation safety quality of the high-speed rail is ensured, the service life is prolonged, and the maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of railway tunnel construction methods, in particular to an anti-cracking construction method for a CRTS I type double-block ballastless track concrete bed slab of a high-speed railway tunnel.
Background
The slab crack of the CRTS I type double-block ballastless track concrete road of the high-speed railway tunnel is more in damage, high in repair cost and poor in effect, and the crack is enlarged in the process of continuously flapping the high-speed railway to cause quality and potential safety hazards and even scrapped.
The track bed board is poured in blocks, the track bed board has less cracks every 6.5m within the range of 200m of the opening, the track bed board has less cracks every 13m within the range of more than 200m away from the opening, the inverted arch and the lining are facility seams of 12m, the structural seam is 20mm wide, the track bed board is filled with a closed-cell polyethylene plastic foam board, and the track bed board is sealed by a silicone sealing material. Before the silicone sealant is poured, a brush is used for uniformly brushing the interface agent on two sides of the joint, and a row of expansion anchor bolts are constructed on two sides of the sleeper. The prior construction method causes a plurality of cracks to be generated on the road bed plate along the construction joint.
Disclosure of Invention
The invention provides a construction structure of a CRTS I type double-block ballastless track concrete track bed slab of a high-speed railway tunnel, which is characterized in that every two sections of the track bed slab, which are more than 200m away from a tunnel portal, are combined into a group, the length of the group is 24m, each 12m section of an inverted arch and a lining are formed, and an initial construction joint of the track bed slab of the first section, the inverted arch of the first section and an initial construction joint of the lining are on the same vertical plane; the track bed plate, the inverted arch and the third construction joint of the lining are on the same vertical plane, and the horizontal distance between the second construction joint of the track bed plate and the second construction joint of the inverted arch and the lining is 0-1 m; by analogy, the odd construction seams of the track bed plate and the same odd construction seams of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even construction seams of the track bed plate and the same even construction seams of the inverted arch and the lining is 0-1 m.
The invention also provides an anti-cracking construction method for the concrete track bed slab of the CRTS I type double-block ballastless track of the high-speed railway tunnel, which comprises the following specific steps: during construction, every two sections of the track bed slab which is more than 200m away from the opening are combined into a group, the length of one group is 24m, and every 12m section of the inverted arch and lining are formed; the initial construction joint of the first section of track bed slab and the initial construction joint of the first section of inverted arch and lining are on the same vertical plane; the horizontal distance between the second construction joint of the track bed plate and the second construction joint of the inverted arch and the lining is 0-1m, and the track bed plate, the inverted arch and the third construction joint of the lining are on the same vertical plane; by analogy, the odd construction seams of the track bed plate and the same odd construction seams of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even construction seams of the track bed plate and the same even construction seams of the inverted arch and the lining is 0-1 m.
The invention has the advantages that:
the ballastless track bed plate, the inverted arch and the lining construction joint are arranged, so that the condition that cracks appear on the bed plate under stress caused by uneven settlement of two sides of the inverted arch construction joint and deformation of the lining construction joint is effectively avoided, and the cracks of the bed plate near the construction joint (also called settlement expansion joint) are basically absent. The invention cancels a row of expanding anchor bolts near the construction joint, realizes the free expansion of concrete at the construction joint and effectively prevents the expansion crack of the track bed slab; according to the invention, the anti-cracking net is arranged 3cm below the concrete surface of the ballast bed plate, so that the shrinkage cracks of the concrete surface layer are effectively avoided, and the warm shrinkage spider veins are few. The concrete of the surface layer of the track bed slab adopts fine stone concrete, which is beneficial to the close combination of the concrete and the fine wire netting. The gravel and river sand are washed by water to remove dust, so that cement particles and other materials are fully mixed and tightly combined, the strength of the concrete is improved, and the impermeability and crack resistance of the concrete are improved. The construction method of the invention can obviously reduce the number of hundreds of meters of cracks. The high-speed rail operation safety quality is ensured, the service life is prolonged, and the maintenance cost is reduced.
Drawings
FIG. 1 is a schematic view of the layout of a construction joint in the construction method of the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
Example 1
As shown in fig. 1 and 2, the embodiment provides a construction structure of a CRTS i type double-block ballastless track concrete track bed slab of a high-speed railway tunnel, and specifically, a conventional construction structure (i.e., the track bed slab is used as construction joints every 6.5 m) is used within a range of 200m from a tunnel opening.
Every two sections of the track bed slab with the distance larger than 200m from the opening are grouped, the length of one group is 24m, every 12m section of the inverted arch and the lining are arranged, and the initial construction joint of the track bed slab at the first section and the initial construction joint of the inverted arch and the lining at the first section are on the same vertical surface;
the track bed plate, the inverted arch and the third construction joint of the lining are on the same vertical plane, and the horizontal distance between the second construction joint of the track bed plate and the second construction joint of the inverted arch and the lining is 0-1 m;
by analogy, the odd construction seams of the track bed plate and the same odd construction seams of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even construction seams of the track bed plate and the same even construction seams of the inverted arch and the lining is 0-1 m.
Preferably, the horizontal distance between the even numbered construction joints of the track bed slab and the same even numbered construction joints of the inverted arch and the lining is 0.3-0.5 m. The distance between the second or even numbered construction joints of the bed plate of the road in the figures 1 and 2 and the second or even numbered construction joints of the inverted arch and the lining is 0.3m, which is adopted by Zhengwanghu north segment ZWZQ-6 in the table 1.
On the basis of the scheme, expansion anchor bolts are not arranged between each construction joint and the sleeper (for example, expansion anchor bolts are not arranged on two sides of the construction joint in fig. 2).
Example 2
Based on the structure of embodiment 1, the embodiment provides an anti-cracking construction method for a CRTS I type double-block ballastless track concrete road bed slab of a high-speed railway tunnel, which specifically comprises the following steps:
during construction, every two sections of the track bed slab with the distance from the opening of the tunnel being more than 200m are combined into a group, the length of one group is 24m, every 12m section of the inverted arch and the lining are arranged, and the initial construction joint of the track bed slab of the first section and the initial construction joint of the inverted arch and the lining of the first section are on the same vertical plane; the track bed plate, the inverted arch and the third construction joint of the lining are on the same vertical plane, and the horizontal distance between the second construction joint of the track bed plate and the second construction joint of the inverted arch and the lining is 0-1 m; by analogy, the odd construction seams of the track bed plate and the same odd construction seams of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even construction seams of the track bed plate and the same even construction seams of the inverted arch and the lining is 0-1 m.
In the range of 200m of the opening, the bed slab is divided every 6.5m according to the previous construction method.
The construction joints are filled with closed-cell polyethylene foam boards and are sealed with silicone sealing material. The interface agent is brushed evenly across the joint with a brush prior to pouring the silicone sealant.
As a preferable scheme, the horizontal distance between the even numbered construction joints of the track bed slab and the same even numbered construction joints of the inverted arch and the lining is 0.3-0.5 m.
On the basis of the scheme, a row of expansion anchor bolts between each construction joint and the sleeper are cancelled, so that the track bed plate at the position becomes a free end of concrete internal stress expansion;
on the basis of the scheme, an anti-cracking net (using iron wires or steel wires) is arranged 3cm below the concrete surface of the track bed plate, the anti-cracking net is a 1cm multiplied by 1cm dense mesh net woven by coarse fine iron wires, and the combination degree and the friction force of the fine iron wires and the concrete are increased;
on the basis of the scheme, the concrete of the surface layer (more than 26 cm) of the track bed slab is C4 fine-stone concrete, and the mixing ratio of C40 concrete is as follows: cement: fly ash: river sand: breaking stone: water: water reducing agent: 1, cracking-resistant compacting agent: 0.25: 1.86: 2.78: 0.41: 0.012: 0.05, wherein the particle size of the broken stone is 5-10mm, the river sand is medium sand, and the broken stone and the river sand are washed by water for dedusting; after construction, the average strength of the concrete reaches 42.5 MPa. The anti-cracking compacting agent used in this example is an anti-cracking compacting agent of model number CA854, manufactured by new manlian (beijing) engineering materials technical research institute limited.
According to the construction method, the horizontal distance of 0-1m is reserved between the even number of construction joints (also called settlement expansion joints) of the track bed plate and the inverted arch and the lining, meanwhile, the anti-cracking net is combined with the fine aggregate concrete, the elastic deformation resisting force of the track bed plate concrete is improved, and in addition, a row of expansion anchor bolts between each construction joint and a sleeper are cancelled, so that most of stress deformation can be released; the construction joints (namely odd construction joints) of each group of the track bed slab and the construction joints of the inverted arch and the lining are on the same vertical plane, so that the elastic deformation resisting force of the section is improved, and the whole stress deformation and the residual stress deformation of the upper section of the section are released. Therefore, the cracks and the fissures are obviously reduced, the strength is improved, and the beating resistance is improved when the high-speed rail operates.
The construction method of the embodiment 1 of the invention is used for construction in the tunnels of high-speed railways in mountain areas of north sections of Zhengwan high-speed railway lakes and Chongqing sections.
TABLE 1 ballast bed plate crack statistics
As can be seen from table 1, the track bed slab has many cracks after being constructed by the construction method in the prior art, but the track bed slab cracks can be greatly reduced by the method of the present invention.
After the construction and the track laying are carried out by using the method, the designed operation speed is 350 km/h, the six standard values of the TQI value of the detection vehicle are automatically detected to be 1.47 under the dynamic condition, the TQI value is reduced by 2.53 compared with the requirement of 4.0 on the high-speed railway design specification, and the effect is very obvious, which is shown in Table 2.
Table 22022 year 4 month Zhengwan Hubei section Chongqing section each standard section orbit fine tuning TQI value summary
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A construction structure of a concrete bed slab of a CRTS I type double-block ballastless track of a high-speed railway tunnel is characterized in that,
every two sections of the track bed slab with the distance larger than 200m from the opening are grouped, the length of one group is 24m, every 12m section of the inverted arch and the lining are arranged, and the initial construction joint of the track bed slab at the first section and the initial construction joint of the inverted arch and the lining at the first section are on the same vertical surface;
the track bed plate, the inverted arch and the third construction joint of the lining are on the same vertical plane, and the horizontal distance between the second construction joint of the track bed plate and the second construction joint of the inverted arch and the lining is 0-1 m;
by analogy, the odd construction seams of the track bed plate and the same odd construction seams of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even construction seams of the track bed plate and the same even construction seams of the inverted arch and the lining is 0-1 m.
2. The construction structure for the concrete track bed slab of the CRTS I type double-block ballastless track of the high-speed railway tunnel according to claim 1, wherein the horizontal distance between the even number of construction joints of the track bed slab and the same even number of construction joints of the inverted arch and the lining is 0.3-0.5 m.
3. The construction structure of the CRTS I type double-block ballastless track concrete bed slab of the high-speed railway tunnel according to claim 1, wherein no anchor expansion bolt is arranged between each construction joint and a sleeper.
4. An anti-cracking construction method for a concrete track bed slab of a CRTS I type double-block ballastless track of a high-speed railway tunnel is characterized by comprising the following specific steps of:
during construction, every two sections of the track bed slab which is more than 200m away from the opening are combined into a group, the length of one group is 24m, and every 12m section of the inverted arch and lining are formed;
the initial construction joint of the first section of track bed slab and the initial construction joint of the first section of inverted arch and lining are on the same vertical plane;
the horizontal distance between the second construction joint of the track bed plate and the second construction joint of the inverted arch and the lining is 0-1m, and the track bed plate, the inverted arch and the third construction joint of the lining are on the same vertical plane;
by analogy, the odd construction seams of the track bed plate and the same odd construction seams of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even construction seams of the track bed plate and the same even construction seams of the inverted arch and the lining is 0-1 m.
5. A method according to claim 4, characterized in that the horizontal distance between the even numbered construction joints of the bed slab and the same even numbered construction joints of the invert and lining is 0.3-0.5 m.
6. The method of claim 4, wherein during construction, a row of expansion anchor bolts between each construction joint and the tie is eliminated.
7. The method of claim 4, wherein the anti-spalling net is disposed 3cm below the concrete surface of the ballast bed slab.
8. The method as claimed in claim 4, wherein the concrete for the surface layer of the track bed slab is C4 fine-stone concrete, and the mixing ratio of C40 concrete is as follows: cement: fly ash: river sand: crushing stone: water: water reducing agent: 1, cracking-resistant compacting agent: 0.25: 1.86: 2.78: 0.41: 0.012: 0.05, wherein the particle size of the broken stone is 5-10mm, the river sand is medium sand, and the broken stone and the river sand are washed by water for dedusting.
9. The method of claim 4, wherein the construction joint is filled with a closed cell polyethylene foam board and covered with a silicone sealant, and the interface agent is uniformly applied to both sides of the joint by using a brush before the silicone sealant is poured.
Priority Applications (2)
| 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 |
| 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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| 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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| CN114941258A true CN114941258A (en) | 2022-08-26 |
| CN114941258B CN114941258B (en) | 2023-05-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127440A (en) * | 2023-10-27 | 2023-11-28 | 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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| 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 |
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| JP6257398B2 (en) * | 2014-03-19 | 2018-01-10 | キヤノン株式会社 | Image forming apparatus |
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2022
- 2022-06-23 CN CN202210717475.7A patent/CN114941258B/en active Active
- 2022-07-19 LU LU502521A patent/LU502521B1/en active IP Right Grant
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| JPH06257398A (en) * | 1993-03-05 | 1994-09-13 | Kajima Corp | Shield tunnel having secondary lining |
| ATA65299A (en) * | 1999-04-13 | 2002-02-15 | Porr Allg Bauges | Ballastless superstructure with prefabricated concrete support plates as well as a procedure for the replacement of the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127440A (en) * | 2023-10-27 | 2023-11-28 | 中国铁路设计集团有限公司 | Double-block ballastless track structure of railway tunnel and construction method thereof |
| 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 | Publication date |
|---|---|
| CN114941258B (en) | 2023-05-23 |
| LU502521B1 (en) | 2023-01-19 |
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