CN114941258B - Anti-cracking construction method for CRTS I type double-block ballastless track concrete track slab of high-speed railway tunnel - Google Patents
Anti-cracking construction method for CRTS I type double-block ballastless track concrete track slab of high-speed railway tunnel Download PDFInfo
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- CN114941258B CN114941258B CN202210717475.7A CN202210717475A CN114941258B CN 114941258 B CN114941258 B CN 114941258B CN 202210717475 A CN202210717475 A CN 202210717475A CN 114941258 B CN114941258 B CN 114941258B
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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
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- 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
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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
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
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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
- 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 of a CRTS I type double-block ballastless track concrete track slab of a high-speed railway tunnel. According to the invention, a row of expansion anchor bolts near the construction joint are eliminated, free expansion of concrete at the construction joint is realized, and expansion cracks of the ballast bed plate are effectively prevented. The number of hundred-meter cracks is obviously reduced after the construction method is used. 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 track slab of a high-speed railway tunnel.
Background
CRTS I type double-block ballastless track concrete slab cracks of the high-speed rail tunnel are more in damage, high in repairing cost and poor in effect, and cracks are enlarged in the continuous 'flapping' process of the high-speed rail operation, so that quality and safety hidden hazards are caused, and even the high-speed rail operation is scrapped.
The road bed board is cast by blocks, cracks of the road bed board are fewer every 6.5m in the range of 200m of the opening, every 13m of the road bed board is separated from the opening by more than 200m, the inverted arch and the lining are 12m provided with construction joints, the structural joint width is 20mm, the road bed board is filled with a closed-pore polyethylene plastic foam board, and a silicone sealing material cover is adopted. And (3) uniformly brushing interface agents on two sides of the joint by using a brush before pouring the silicone sealant, and constructing a row of expansion anchor bolts on two sides of the sleeper. The current construction method causes more cracks to be generated on the road bed board along the construction joint.
Disclosure of Invention
The invention provides a CRTS I type double-block ballastless track concrete track bed board construction structure of a high-speed railway tunnel, and particularly, each two sections of track bed boards with the distance of more than 200m from a tunnel portal are in a group, the length of each group is 24m, each 12m section of inverted arch and lining is formed, and the initial construction joint of a first section of track bed board and the initial construction joint of a first section of inverted arch and lining are on the same vertical plane; the third construction joints of the road bed plate, the inverted arch and the lining are arranged on the same vertical plane, and the horizontal distance between the second construction joint of the road bed plate and the second construction joint of the inverted arch and the lining is 0-1m; and similarly, the odd-numbered construction joints of the road bed plate and the same odd-numbered construction joints of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even-numbered construction joints of the road bed plate and the same even-numbered construction joints of the inverted arch and the lining is 0-1m.
The invention also provides a CRTS I type double-block ballastless track concrete track slab anti-cracking construction method of the high-speed railway tunnel, which comprises the following steps: during construction, every two sections of track bed plates with the distance from the tunnel portal being more than 200m are combined into a group, the length of the group is 24m, and each 12m section of inverted arch and lining is combined; the initial construction joint of the first section of the road bed board and the initial construction joint of the first section of the inverted arch and the lining are on the same vertical plane; the horizontal distance between the second construction joint of the road bed board and the second construction joints of the inverted arch and the lining is 0-1m, and the third construction joints of the road bed board, the inverted arch and the lining are on the same vertical plane; and similarly, the odd-numbered construction joints of the road bed plate and the same odd-numbered construction joints of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even-numbered construction joints of the road bed plate and the same even-numbered construction joints of the inverted arch and the lining is 0-1m.
The invention has the advantages that:
according to the invention, the ballastless track bed board, the inverted arch and the lining construction joint are arranged, so that the occurrence of cracks of the ballast bed board caused by the stress of deformation of the lining construction joint due to uneven settlement at two sides of the inverted arch construction joint is effectively avoided, and the cracks of the ballast bed board near the construction joint (also called as settlement expansion joint) are basically avoided. According to the invention, a row of expansion anchor bolts near the construction joint are eliminated, so that the free expansion of concrete at the construction joint is realized, and the expansion crack of the road bed board is effectively prevented; according to the invention, the anti-cracking net is arranged 3cm below the concrete surface of the track bed plate, so that shrinkage cracks on the concrete surface layer are effectively avoided, and the number of thermal shrinkage spider veins is small. The concrete on the surface layer of the ballast bed plate adopts fine stone concrete, which is favorable for the close combination of the concrete and the fine wire netting. The broken stone and river sand are washed 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 number of hundred-meter cracks is obviously reduced after the construction method is used. The operation safety quality of the high-speed rail is ensured, the service life is prolonged, and the maintenance cost is reduced.
Drawings
FIG. 1 is a schematic 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 with reference to the drawings and examples, it being noted that the examples described below are intended to facilitate the understanding of the invention and are not intended to limit the invention in any way.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a construction structure of a CRTS i type double block ballastless track concrete track slab of a high-speed railway tunnel, specifically, a conventional construction structure is used within 200m from a tunnel portal (i.e., track slabs are used as construction joints every 6.5 m).
Every two sections of track bed plates with the distance of more than 200m from the tunnel portal are in one group, the length of one group is 24m, each 12m sections of inverted arch and lining are arranged, and the initial construction joint of the first section of track bed plates and the initial construction joint of the first section of inverted arch and lining are on the same vertical plane;
the third construction joints of the road bed plate, the inverted arch and the lining are arranged on the same vertical plane, and the horizontal distance between the second construction joint of the road bed plate and the second construction joint of the inverted arch and the lining is 0-1m;
and similarly, the odd-numbered construction joints of the road bed plate and the same odd-numbered construction joints of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even-numbered construction joints of the road bed plate and the same even-numbered construction joints of the inverted arch and the lining is 0-1m.
Preferably, the horizontal distance between the even number of construction joints of the roadbed slab and the same even number of construction joints of the inverted arch and the lining is 0.3-0.5m. The distance between the second or even number of construction joints of the track bed in fig. 1 and 2 and the second or even number of construction joints of the inverted arch or lining is 0.3m, which is adopted in the north section ZWZQ-6 of Zheng Mohu in table 1.
On the basis of the scheme, no expansion anchor bolts are arranged between each construction joint and the sleeper (as in the case of the 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 a CRTS I type double-block ballastless track concrete track slab anti-cracking construction method for a high-speed railway tunnel, which comprises the following steps:
during construction, every two sections of track bed plates with the distance of more than 200m from the opening are combined into a group, the length of one group is 24m, each section of inverted arch and lining is 12m, and the initial construction joint of the first section of track bed plate and the initial construction joint of the first section of inverted arch and lining are on the same vertical plane; the third construction joints of the road bed plate, the inverted arch and the lining are arranged on the same vertical plane, and the horizontal distance between the second construction joint of the road bed plate and the second construction joint of the inverted arch and the lining is 0-1m; and similarly, the odd-numbered construction joints of the road bed plate and the same odd-numbered construction joints of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even-numbered construction joints of the road bed plate and the same even-numbered construction joints of the inverted arch and the lining is 0-1m.
The track bed plates are separated at intervals of 6.5m according to the previous construction method within the range of the opening 200 m.
The construction joint is filled with a closed-cell polyethylene foam sheet and covered with a silicone sealing material. The interfacial agent was uniformly applied to both sides of the seam using a brush prior to pouring the silicone sealant.
As a preferable scheme, the horizontal distance between the even number of construction joints of the track bed board and the same even number of construction joints of the inverted arch and the lining is 0.3-0.5m.
On the basis of the scheme, a row of expansion anchor bolts between each construction joint and the sleeper are canceled, so that the track bed plate at the position is a free end for stretching internal stress of the concrete;
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 ballast bed plate, the anti-cracking net is a 1cm multiplied by 1cm dense mesh net woven by coarser fine iron wires, and the combination degree and friction force of the fine iron wires and the concrete are increased;
on the basis of the scheme, the concrete on the surface layer (more than 26 cm) of the ballast bed plate adopts C4 fine stone concrete, and the mixing ratio of C40 concrete is as follows: and (3) cement: fly ash: river sand: broken stone: water: water reducing agent: crack resistant compaction agent = 1:0.25:1.86:2.78:0.41:0.012:0.05, 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 dedusted by water washing; after construction, the average strength of the concrete reaches 42.5MPa. The anti-cracking compacting agent used in this example was a model CA854 anti-cracking compacting agent produced by New Manchester engineering materials technology institute, inc.
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 slab and the inverted arch and the lining, meanwhile, the anti-cracking net is combined with fine stone concrete, so that the elastic deformation resisting force of the track bed slab concrete is improved, and a row of expansion anchor bolts between each construction joint and the sleeper are canceled, so that most of stress deformation can be released; the construction joints (namely the odd construction joints) of each group of the track bed boards, the inverted arch and the lining construction joints are arranged on the same vertical plane, so that the elastic deformation resistance of the section is improved, and all the stress deformation and the upper section residual stress deformation of the section are released. Therefore, the cracks and the fissures are obviously reduced, the strength is improved, and the anti-flapping capability is improved when the high-speed rail is operated.
The construction method of the embodiment 1 of the invention is used for constructing the tunnels of high-speed railways in the mountainous areas of Zheng Mogao iron Hubei section and Chongqing section.
Table 1 ballast crack statistics
As can be seen from Table 1, the road bed plate has more cracks after construction by the construction method in the prior art, but the method can greatly reduce the cracks of the road bed plate.
After the method is used for construction and rail laying, the design operation speed is 350 km/h, the detection vehicle automatically detects that the TQI value is six-marked as 1.47 under the dynamic condition, the TQI value is reduced by 2.53 compared with the requirement of 4.0 of the design specification of the high-speed railway, and the effect is obvious, as shown in Table 2.
Table 2 summary of the track fine tuning TQI values for each of the index segments of the Chongqing segment of the Hubei segment of 4 months Zheng Mo of 2022
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (9)
1. A construction structure of a CRTS I type double-block ballastless track concrete track bed board of a high-speed railway tunnel is characterized in that,
every two sections of track bed plates with the distance of more than 200m from the tunnel portal are in one group, the length of one group is 24m, each 12m sections of inverted arch and lining are arranged, and the initial construction joint of the first section of track bed plates and the initial construction joint of the first section of inverted arch and lining are on the same vertical plane;
the third construction joints of the road bed plate, the inverted arch and the lining are arranged on the same vertical plane, and the horizontal distance between the second construction joint of the road bed plate and the second construction joint of the inverted arch and the lining is 0-1m;
and similarly, the odd-numbered construction joints of the road bed plate and the same odd-numbered construction joints of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even-numbered construction joints of the road bed plate and the same even-numbered construction joints of the inverted arch and the lining is 0-1m.
2. The construction structure of the CRTS I type double-block ballastless track concrete track slab of the high-speed railway tunnel according to claim 1, wherein the horizontal distance between the even number of construction joints of the track slab and the same even number of construction joints of the inverted arch and the lining is 0.3-0.5m.
3. The construction structure of the CRTS I type double-block ballastless track concrete track slab of the high-speed railway tunnel according to claim 1, wherein an expansion anchor bolt is not arranged between each construction joint and the sleeper.
4. A CRTS I type double-block ballastless track concrete track bed board anti-cracking construction method for a high-speed railway tunnel is characterized by comprising the following specific steps:
during construction, every two sections of track bed plates with the distance from the tunnel portal being more than 200m are combined into a group, the length of the group is 24m, and each 12m section of inverted arch and lining is combined;
the initial construction joint of the first section of the road bed board and the initial construction joint of the first section of the inverted arch and the lining are on the same vertical plane;
the horizontal distance between the second construction joint of the road bed board and the second construction joints of the inverted arch and the lining is 0-1m, and the third construction joints of the road bed board, the inverted arch and the lining are on the same vertical plane;
and similarly, the odd-numbered construction joints of the road bed plate and the same odd-numbered construction joints of the inverted arch and the lining are on the same vertical plane, and the horizontal distance between the even-numbered construction joints of the road bed plate and the same even-numbered construction joints of the inverted arch and the lining is 0-1m.
5. The method of claim 4, wherein the horizontal distance between the even number of construction joints of the track bed and the same even number of construction joints of the inverted arch and the lining is 0.3-0.5m.
6. The method of claim 4, wherein a row of expansion anchor bolts between each of the construction joints and the tie is eliminated during construction.
7. The method of claim 4, wherein the anti-cracking net is disposed 3cm below the concrete surface of the ballast bed slab.
8. The method according to claim 4, wherein the concrete on the surface layer of the ballast bed plate adopts C4 fine stone concrete, and the mixing ratio of the C40 concrete is as follows: and (3) cement: fly ash: river sand: broken stone: water: water reducing agent: crack resistant compaction agent = 1:0.25:1.86:2.78:0.41:0.012:0.05, 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 dedusted by water washing.
9. The method of claim 4 wherein the construction joint is filled with a closed cell polyethylene plastic foam sheet and covered with a silicone sealant material and the interface agent is applied uniformly across the joint using a brush prior to pouring the silicone sealant.
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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| 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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| CN114941258B true CN114941258B (en) | 2023-05-23 |
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- 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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| CN114941258A (en) | 2022-08-26 |
| LU502521B1 (en) | 2023-01-19 |
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