CN111155368A - Reinforcing structure, roadbed assembly, roadbed system and construction method for high-speed railway - Google Patents
Reinforcing structure, roadbed assembly, roadbed system and construction method for high-speed railway Download PDFInfo
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- CN111155368A CN111155368A CN202010086317.7A CN202010086317A CN111155368A CN 111155368 A CN111155368 A CN 111155368A CN 202010086317 A CN202010086317 A CN 202010086317A CN 111155368 A CN111155368 A CN 111155368A
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- E—FIXED CONSTRUCTIONS
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- E01B2/00—General structure of permanent way
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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
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Abstract
The invention relates to the field of high-speed railway roadbed engineering, in particular to a reinforced structure, a roadbed component, a roadbed system and a construction method for a high-speed railway, wherein the reinforced structure comprises a first reinforced pile foundation component, two sides of the first reinforced pile foundation component are respectively provided with a second reinforced pile foundation component, the second reinforced pile foundation component comprises a first supporting pile part and a supporting frame rigidly connected with the first supporting pile part, the supporting frame is arranged at the top of the first supporting pile part, and the supporting frame is of an integral structure. The reinforcing structure for the high-speed railway effectively reduces the nonuniformity of anti-sliding stress of the first supporting pile part in the foundation in the coverage range of the side slopes on the two sides of the roadbed, and obviously improves the anti-sliding destructive capacity of the low-strength soft soil foundation, thereby improving the overall stability of the roadbed of the low-strength soft soil foundation and reducing the instability probability of the roadbed.
Description
Technical Field
The invention relates to the field of high-speed railway roadbed engineering, in particular to a reinforced structure, a roadbed assembly, a roadbed system and a construction method for a high-speed railway.
Background
At present, because of complex and various geological conditions in China, when a railway is constructed, a roadbed is sometimes constructed on a soft soil foundation, particularly for a southeast coastal region which mainly uses sea-phase soft soil and has a deep soft foundation, but the difficult problems of insufficient bearing capacity of the foundation and large roadbed settlement deformation are always the construction difficulties of a high-speed railway in the region. Therefore, effective engineering measures must be taken to reinforce the low-strength soft soil foundation.
The settlement control requirement of the high-speed railway after the construction of the roadbed is very high, the traditional method for reinforcing the discrete material pile composite foundation by taking drainage consolidation, preloading method and gravel pile and compacted sand pile as main parts is difficult to meet the engineering requirement, the application range of the flexible pile composite foundation by taking cement mixing pile and cement mortar pile as main parts is limited by the problems of low bearing capacity, relatively large settlement and the like, and the high-strength pile composite foundation adopting the strength of C15 and above becomes the main type measure for reinforcing the roadbed engineering foundation of the high-speed railway in China. However, even if the low-strength soft soil foundation is reinforced by high-strength piles, the instability and collapse of the roadbed caused by the weak foundation and the insufficient stability of the whole reinforced structure sometimes happen. Research has shown that, for rigid pile composite foundations such as CFG piles (Cement Fly-ash Gravel piles) and plain concrete piles, pile bodies near side slopes are firstly bent and damaged when a roadbed is unstable, and further gradual damage to surrounding pile bodies is caused. Numerical simulation and centrifugal tests show that the failure modes of the rigid pile composite foundation under the roadbed are different due to different pile body positions, wherein the pile bodies near the side slope are mainly subjected to bending failure, and the pile bodies near the center of the roadbed are mainly subjected to axial compression failure. Therefore, the anti-sideslip damage capability of the low-strength soft soil foundation is one of the final factors for improving the overall stability of the reinforced structure, and therefore, how to improve the anti-sideslip damage capability of the low-strength soft soil foundation becomes a key technology. However, the pile-cap structure commonly used in the engineering industry at present can fully exert the bearing performance of the pile body, coordinate the load sharing of pile soil and improve the bearing capacity of the foundation, but has limited capability of improving the anti-slip damage capability of a low-strength soft soil foundation, particularly the foundation near a slope toe.
Disclosure of Invention
The invention aims to: aiming at the problem that the roadbed instability caused by the weak foundation and the insufficient integral stability of the reinforced structure sometimes even if high-strength piles are adopted for reinforcement of the low-strength soft soil foundation in the prior art, the high-speed railway reinforced structure, the roadbed component, the roadbed system and the construction method are provided, so that the anti-sliding damage capability of piles near the side slope is improved, the integral stability of the roadbed of the low-strength soft soil foundation is improved, and the probability of the roadbed instability caused by the weak foundation and the insufficient integral stability of the reinforced structure of the low-strength soft soil foundation is reduced.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a be used for high-speed railway reinforced structure, includes first reinforcement pile foundation subassembly the both sides of first reinforcement pile foundation subassembly are provided with the second respectively and consolidate the pile foundation subassembly, the second consolidate the pile foundation subassembly include first support pile part and with first support pile part rigid connection's support frame, the support frame set up in first support pile part top, the support frame is overall structure.
When the reinforcing structure for the high-speed railway is used, the first reinforcing pile foundation assembly is arranged in a foundation in the coverage range of the top surface of the roadbed and is used for supporting the middle part of the roadbed; laying the support frames in the foundation in the coverage range of the side slopes on the two sides of the roadbed, and supporting the support frames by using first support pile parts, so that the support frames can support the side slope parts on the two sides of the roadbed; the support frame is connected with first support pile part rigid coupling, just the support frame is overall structure, thereby make the top of the first support pile part of the at least part of side slope bottom connect for a whole, thereby reduce the bending tensile stress of the single support pile of side slope annex, the bending tensile stress of homogenization support pile, promote the effect such as supporting pile is anti-skidding in coordination, effectively reduced in the foundation of road bed both sides side slope coverage, the inhomogeneity of first support pile part anti-skidding atress, show the anti-skid capability that improves low strength soft soil foundation, thereby increase low strength soft soil foundation road bed overall stability, it is soft weak to reduce the soft soil gene foundation of low strength, the not enough and road bed unstability's that causes of reinforced structure overall stability probability.
Preferably, the first support pile part comprises a plurality of first support piles arranged at vertical intervals, and the first support piles are rigidly connected with the support frame.
Preferably, the support frame is provided with a plurality of pile cap plates corresponding to the first support piles, and the first support piles are rigidly connected with the corresponding pile cap plates.
Preferably, a reinforcing beam is rigidly connected between adjacent pile cap plates, so that the structure of the support frame is more stable, the support frame and the first support pile part are better integrated, and the sliding damage resistance of the first support pile part can be better improved.
Preferably, the pile cap plate and the reinforcing beam are both concrete members, tie bars are arranged in the reinforcing beam and the pile cap plate, and the tie bars in the reinforcing beam are connected with the tie bars in the adjacent pile cap plate.
Preferably, the first support piles and/or the second support piles are arranged in a grid.
Preferably, the support frame is a concrete member, and the strength of the support frame is greater than or equal to C30 concrete
Preferably, the first support piles and/or the second support piles are arranged in a grid.
Preferably, when CFG piles or concrete piles are adopted as the first supporting piles, the pile spacing is 1.5-2.0 m, and when reinforced concrete piles are adopted, the pile spacing is 2.0-2.5 m.
Preferably, when CFG piles or concrete piles are adopted as the second supporting piles, the pile spacing is 1.5-2.0 m, and when reinforced concrete piles are adopted, the pile spacing is 2.0-2.5 m.
Preferably, the support frame top is flush with the second reinforced pile foundation assembly top.
Preferably, first reinforcement pile foundation subassembly includes the second support stake that a plurality of vertical intervals set up, the top rigid connection of first reinforcement pile foundation subassembly has the pile cap, the outer edge of pile cap stretches out the lateral wall that the stake is supported to the second.
At the top rigid connection pile cap of first reinforcement pile foundation subassembly, increased the bearing area of first reinforcement pile foundation subassembly, the bearing performance of the first reinforcement pile foundation subassembly of full play coordinates the proportion that the stake soil bore the load, has improved foundation bearing capacity.
In addition, in the scheme, the support frame and the first support pile part are arranged in the foundation in the coverage range of the side slopes on the two sides of the roadbed, and the second support pile and the pile cap are arranged in the foundation in the coverage range of the top surface of the roadbed, so that the anti-skid capacity of the low-strength soft soil foundation can be improved in the area where the foundation is easy to slip and damage, and the bearing capacity of the low-strength soft soil foundation can also be improved in the area where the foundation is easy to bear and damage; the scheme is suitable for a foundation failure mode, fully exerts the anti-failure capability of the reinforced structure, greatly reduces the engineering construction cost and has remarkable economic benefit.
The invention also discloses a roadbed component for the high-speed railway, which comprises a roadbed, wherein side slopes are arranged on two sides of the roadbed, the reinforcing structure is arranged below the roadbed, the first reinforcing pile foundation component is arranged along the length direction of the roadbed, the second reinforcing pile foundation components are arranged on two sides of the first reinforcing pile foundation component, and at least part of the second reinforcing pile foundation components are arranged below the side slopes.
When the first reinforcing pile foundation assembly is used, the first reinforcing pile foundation assembly is arranged in a foundation in the coverage range of the top surface of the roadbed and is used for supporting the middle part of the roadbed; laying the support frames in the foundation in the coverage range of the side slopes on the two sides of the roadbed, and supporting the support frames by using first support pile parts, so that the support frames can support the side slope parts on the two sides of the roadbed; the support frame is connected with first support pile part rigid coupling, just the support frame is overall structure, thereby make the top of the at least partly first support pile part in side slope bottom connect for a whole, thereby reduce the bending tension of the single support pile of side slope annex, the bending tension of averaging support pile, promote effects such as supporting stake synergism antiskid, effectively reduced in the foundation of road bed both sides side slope coverage, the inhomogeneity of first support pile part antiskid atress, show the anti-skid failure ability that improves low strength soft soil foundation, thereby increase low strength soft soil foundation road bed overall stability, it is weak to reduce the soft soil gene foundation of low strength, the not enough and road bed unstability's that causes of reinforced structure overall stability probability.
Preferably, a cushion layer is further arranged between the roadbed and the reinforcing structure, a first tie bar is arranged in the cushion layer, and the first tie bar is a bidirectional stretching geogrid.
Preferably, the first lacing wire is transversely arranged and has at least one layer.
Preferably, the thickness H of the reinforced cushion layer is 400-600 mm; the first lacing wire in the cushion layer can be arranged in one layer or a plurality of layers, and the ultimate tensile strength of the lacing wire (2-a) is more than or equal to 80 kN/m.
The invention also discloses a roadbed system adopting the roadbed component, which comprises a foundation, wherein the roadbed is arranged on the foundation, and the lower ends of the first supporting pile part and the first reinforcing pile foundation component extend into the foundation.
When the roadbed system adopting the roadbed component is used, the first reinforced pile foundation component is arranged in a foundation in the coverage range of the top surface of the roadbed and is used for supporting the middle part of the roadbed; laying the support frames in the foundation in the coverage range of the side slopes on the two sides of the roadbed, and supporting the support frames by using first support pile parts, so that the support frames can support the side slope parts on the two sides of the roadbed; the support frame is connected with first support pile part rigid coupling, just the support frame is overall structure, thereby make the top of the at least partly first support pile part in side slope bottom connect for a whole, thereby reduce the bending tension of the single support pile of side slope annex, the bending tension of averaging support pile, promote effects such as supporting stake synergism antiskid, effectively reduced in the foundation of road bed both sides side slope coverage, the inhomogeneity of first support pile part antiskid atress, show the anti-skid failure ability that improves low strength soft soil foundation, thereby increase low strength soft soil foundation road bed overall stability, it is weak to reduce the soft soil gene foundation of low strength, the not enough and road bed unstability's that causes of reinforced structure overall stability probability.
Preferably, the ground is including being provided with ground soft soil layer and ground supporting layer from top to bottom, the lower extreme of first support stake part stretches into ground supporting layer.
The invention also discloses a construction method for forming the roadbed system, which comprises the following steps:
excavating a groove for placing the support frame on the foundation;
constructing the first supporting pile part at the bottom of the groove;
constructing the support frame in the groove;
constructing the second reinforced pile foundation assembly on the foundation between the adjacent grooves to form the reinforced structure;
and performing the roadbed construction on the reinforced structure.
According to the construction method for forming the roadbed system, during construction, firstly, a groove is dug in a foundation to be used for placing the support frame, then, the first support pile part is constructed at the bottom of the groove to be used for supporting the support frame, after the first support pile part is constructed, the support frame is constructed in the groove, the support frame is rigidly connected with the first support pile part, so that the support frame can support slope parts on two sides of the roadbed, and the top of the first support pile part and the support frame form a whole; and simultaneously or after the construction, the second reinforced pile foundation component construction is carried out on the foundation between the adjacent grooves, the first reinforced pile foundation component is arranged in the foundation with the coverage of the top surface of the roadbed and is used for supporting the middle part of the roadbed, then the roadbed construction is carried out on the reinforced structure, and the construction of a roadbed system is completed.
In conclusion, the support frame is rigidly connected with the first support pile part, so that the tops of at least one part of the first support pile parts at the bottom of the side slope are connected into a whole, the bending tensile stress of a single support pile of a side slope accessory is reduced, the bending tensile stress of the support pile is averaged, the synergistic anti-sliding effect of the support pile is promoted, the non-uniformity of the anti-sliding stress of the first support pile parts in the foundation in the coverage range of the side slopes at two sides of the roadbed is effectively reduced, the anti-sliding destructive capacity of the low-strength soft soil foundation is obviously improved, the overall stability of the roadbed of the low-strength soft soil foundation is improved, and the probability of roadbed instability caused by the weak genetic foundation of the low-strength soft soil and the insufficient overall stability of a reinforcing.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention relates to a reinforcing structure for a high-speed railway, which is characterized in that the tops of at least one part of first supporting pile parts are connected into a whole, so that the bending tensile stress of a single supporting pile of a side slope accessory is reduced, the bending tensile stress of the supporting pile is homogenized, the supporting pile is promoted to cooperate with anti-sliding and the like, the non-uniformity of anti-sliding stress of the first supporting pile parts in the foundation in the coverage range of the side slopes on two sides of the roadbed is effectively reduced, the anti-sliding destructive capacity of a low-strength soft soil foundation is obviously improved, the overall stability of the roadbed of the low-strength soft soil foundation is improved, and the probability of roadbed instability caused by the weak genetic foundation of the low-strength soft soil and the insufficient overall stability.
2. According to the reinforcing structure for the high-speed railway, the reinforcing beam is rigidly connected between the adjacent pile cap plates, so that the structure of the support frame is more stable, the support frame and the first support pile part form a whole better, and the sliding damage resistance of the first support pile part can be improved better.
3. According to the high-speed railway reinforcing structure, the support frame and the first support pile part are arranged in the foundation in the coverage range of the side slopes on the two sides of the roadbed, the second support pile and the pile cap are arranged in the foundation in the coverage range of the top surface of the roadbed, the anti-skid damage capability of the low-strength soft soil foundation can be improved in the area where the foundation is easy to slip and damage, and the bearing capability of the low-strength soft soil foundation can also be improved in the area where the foundation is easy to bear and damage; the scheme is suitable for a foundation failure mode, fully exerts the anti-failure capability of the reinforced structure, greatly reduces the engineering construction cost and has remarkable economic benefit.
4. The invention relates to a roadbed component for a high-speed railway, which is characterized in that the tops of at least one part of first supporting pile parts are connected into a whole, so that the bending tensile stress of a single supporting pile of a side slope accessory is reduced, the bending tensile stress of the supporting pile is homogenized, the supporting pile is promoted to cooperate with anti-sliding and the like, the non-uniformity of anti-sliding stress of the first supporting pile parts in the foundation in the coverage range of the side slopes on two sides of the roadbed is effectively reduced, the anti-sliding destructive capability of a low-strength soft soil foundation is obviously improved, the overall stability of the low-strength soft soil foundation roadbed is improved, and the roadbed instability probability caused by the weak gene foundation of the low-strength soft soil and the insufficient overall stability of a reinforced.
5. The roadbed system adopting the roadbed component is characterized in that the tops of at least one part of first supporting pile parts are connected into a whole, so that the bending tensile stress of a single supporting pile of a side slope accessory is reduced, the bending tensile stress of the supporting pile is homogenized, the supporting pile is promoted to cooperate with anti-sliding and the like, the non-uniformity of anti-sliding stress of the first supporting pile parts in the foundation in the coverage range of the side slopes on two sides of the roadbed is effectively reduced, the anti-sliding destructive capacity of a low-strength soft soil foundation is obviously improved, the overall stability of the low-strength soft soil foundation roadbed is improved, and the probability of roadbed instability caused by the insufficient overall stability of the low-strength soft soil gene foundation and a reinforced structure is reduced.
6. The construction method for forming the roadbed system comprises the steps of rigidly connecting the support frame with the first support pile part, so that the tops of at least one part of the first support pile parts at the bottom of the side slope are connected into a whole, thereby reducing the bending tensile stress of a single support pile of the side slope accessory, averaging the bending tensile stress of the support pile, promoting the synergistic anti-sliding effect of the support pile and the like, effectively reducing the non-uniformity of the anti-sliding stress of the first support pile part in the foundation in the coverage range of the side slopes at two sides of the roadbed, obviously improving the anti-sliding destructive capacity of the low-strength soft soil foundation, further improving the overall stability of the roadbed of the low-strength soft soil foundation, and reducing the possibility of roadbed instability caused by the weak genetic foundation of the low-strength soft soil and the insufficient overall stability of a reinforced structure.
Drawings
Fig. 1 is a cross-sectional view of a construction of a roadbed system using the roadbed assembly according to the present invention.
Fig. 2 is a top view of a roadbed system using the roadbed assembly according to the present invention.
Fig. 3 is a schematic structural view of a second reinforced pile foundation assembly of the present invention.
Fig. 4 is a schematic structural view of a first reinforced pile foundation assembly of the present invention.
Fig. 5 is a flow chart of a construction method for forming the roadbed system.
Icon: 1-a roadbed; 11-side slopes; 12-roadbed top surface; 2-a first reinforced pile foundation component; 21-a second support pile; 22-pile caps; 3-a second reinforced pile foundation component; 31-a first support pile member; 311-first support peg; 32-a support frame; 321-pile cap plate; 322-a stiffening beam; 4-foundation; 41-soft soil layer of foundation; 42-ground bearing layer; 5-cushion layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, 2 and 4, a reinforced structure for a high-speed railway comprises a first reinforced pile foundation component 2, the two sides of the first reinforced pile foundation component 2 are respectively provided with a second reinforced pile foundation component 3, the second reinforced pile foundation component 3 comprises a first supporting pile part 31 and a supporting frame 32 rigidly connected with the first supporting pile part 31, the supporting frame 32 is arranged at the top of the first supporting pile part 31, and the supporting frame 32 is of an integral structure.
The first supporting pile 311 preferably adopts a CFG pile, a concrete pile or a reinforced concrete pile, and the compressive strength of the test block of the pile body is not lower than 15 MPa; the reinforced beam 322 is a reinforced concrete beam, and the concrete strength is not lower than C30; the reinforcing beam 322 is rigidly connected to the adjacent reinforcing pile 3 a.
The pile diameter of the first supporting pile 311 is preferably 400-600 mm, the cross-sectional height h of the reinforcing beam 322 is preferably 300-500 mm, and the cross-sectional width B is greater than or equal to the pile diameter of the reinforcing pile 3 a.
In addition, in a further preferable mode, the first support piles 311 are arranged in a grid shape.
Preferably, the support frame 32 is a concrete member, and the strength of the support frame 32 is greater than or equal to C30 concrete
On the basis, in a further preferable mode, when the first supporting pile 311 is a CFG pile or a concrete pile, the pile spacing is 1.5 to 2.0m, and when a reinforced concrete pile is used, the pile spacing is 2.0 to 2.5 m.
On the basis of the above, it is further preferable that the top of the supporting frame 32 is flush with the top of the second reinforced pile foundation member 3.
When the reinforcing structure for the high-speed railway is used, the first reinforcing pile foundation component 2 is arranged in a foundation in the coverage range of the top surface 12 of the roadbed and is used for supporting the middle part of the roadbed 1; laying the support frames 32 in the foundation of the slope coverage area on two sides of the roadbed, and supporting the support frames 32 by using the first support pile parts 31, so that the support frames 32 can support the slope parts on two sides of the roadbed 1; support frame 32 and first support pile part 31 rigid connection, just support frame 32 is overall structure, thereby make the top of the at least partial first support pile part 31 of side slope bottom connect for a whole, thereby reduce the bending tension of the single support pile of side slope annex, the bending tension of homogenization support pile, promote the effect such as supporting pile collaborative anti-skidding, effectively reduced in the foundation of 1 both sides side slope coverage of road bed, the anti-skidding atress of first support pile part 31, show the anti-skid destructive power that improves low strength soft soil foundation's inhomogeneity, thereby increase low strength soft soil foundation overall stability, it is soft weak to reduce low strength soft soil gene foundation, the not enough and road bed unstability's that causes of reinforced structure overall stability probability.
On the basis, in a further preferable mode, the first support pile part 31 includes a plurality of first support piles 311 arranged at vertical intervals, and the first support piles 311 are rigidly connected to the support frame 32. .
In addition, in a further preferable mode, the support frame 32 is provided with a plurality of pile cap plates 321 corresponding to the first support piles 311, and the first support piles 311 are rigidly connected to the corresponding pile cap plates 321.
On the basis, in a further preferable mode, the reinforcing beam 322 is rigidly connected between adjacent pile cap plates 321, so that the structure of the support frame 32 is more stable, the support frame 32 and the first support pile member 31 are better integrated, and the sliding damage resistance of the first support pile member 31 can be better improved.
In addition, in a more preferable mode, the pile cap plate 321 and the reinforcing beam 322 are both concrete members, tie bars are provided in both the reinforcing beam 322 and the pile cap plate 321, and the tie bars in the reinforcing beam 322 are connected with the tie bars in the adjacent pile cap plate 321.
Example 2
As shown in fig. 1-3, a what be said in this embodiment is used for high speed railway reinforced structure, the difference with embodiment 1 lies in, first reinforcement pile foundation subassembly 2 includes the second support stake 21 that a plurality of vertical intervals set up, the top rigid connection of first reinforcement pile foundation subassembly 2 has pile cap 22, the outer edge of pile cap 22 stretches out the lateral wall of second support stake 21, at the top rigid connection pile cap 22 of first reinforcement pile foundation subassembly 2, has increased the bearing area of first reinforcement pile foundation subassembly 2, the bearing capacity of first reinforcement pile foundation subassembly 2 of full play, the proportion of coordination pile soil bearing load has improved foundation bearing capacity.
In addition, it is further preferable that the second support piles 21 are arranged in a grid.
Specifically, the preferable pile diameter of the second support pile 21 is 400-600 mm; the height of pile cap 22 is 300 ~ 400mm, the external diameter of pile cap 22 is more than or equal to two adjacent second support stake 21 between half of the distance, and be less than two adjacent second support stake 21 between the distance.
On the basis, in a further preferable mode, when the second support piles 21 are CFG piles or concrete piles, the pile spacing is 1.5 to 2.0m, and when reinforced concrete piles are used, the pile spacing is 2.0 to 2.5 m.
The beneficial effects of this embodiment: according to the reinforcing structure for the high-speed railway, the supporting frame 32 and the first supporting pile part 31 are arranged in the foundation in the coverage range of the side slopes on the two sides of the roadbed, the second supporting pile 21 and the pile cap 22 are arranged in the foundation in the coverage range of the top surface of the roadbed, the anti-skid damage capability of the low-strength soft soil foundation can be improved in the area where the foundation is easy to slip and damage, and the bearing capability of the low-strength soft soil foundation can also be improved in the area where the foundation is easy to bear and damage; the scheme is suitable for a foundation failure mode, fully exerts the anti-failure capability of the reinforced structure, greatly reduces the engineering construction cost and has remarkable economic benefit.
Example 3
As shown in fig. 1 and 2, the embodiment discloses a roadbed component for a high-speed railway, which comprises a roadbed 1, wherein side slopes 11 are arranged on two sides of the roadbed 1, a reinforcing structure is arranged below the roadbed 1 according to the embodiment 1 or 2, a first reinforcing pile foundation component 2 is arranged along the length direction of the roadbed 1, a second reinforcing pile foundation component 3 is arranged on two sides of the first reinforcing pile foundation component 2, and at least one part of the second reinforcing pile foundation component 3 is arranged below the side slopes 11.
Specifically, the thickness H of the reinforced cushion layer 2 is 400-600 mm; the first lacing wire in the cushion layer 5 can be arranged in one layer or a plurality of layers, and the ultimate tensile strength of the lacing wire 2-a is more than or equal to 80 kN/m.
On the basis, in a further preferable mode, a cushion layer 5 is further arranged between the roadbed 1 and the reinforcing structure, a first tie bar is arranged in the cushion layer 5, and the first tie bar is a bidirectional-stretching high-strength low-strain geogrid.
Specifically, the cushion layer 5 is formed by paving broken stones.
On the basis, in a further preferable mode, the first lacing wire is transversely arranged and is arranged in at least one layer.
When the assembly is used, the first reinforced pile foundation assembly 2 is arranged in a foundation covered by the top surface 12 of the roadbed and is used for supporting the middle part of the roadbed 1; laying the support frames 32 in the foundation of the slope coverage area on two sides of the roadbed, and supporting the support frames 32 by using the first support pile parts 31, so that the support frames 32 can support the slope parts on two sides of the roadbed 1; support frame 32 and first support pile part 31 rigid connection, just support frame 32 is overall structure, thereby make the top of the at least partly first support pile part 31 of side slope bottom connect for a whole, thereby reduce the bending stress of the single support pile of side slope annex, the bending stress of averaging support pile, promote the effect such as supporting pile collaborative anti-skidding, effectively reduced in the ground of 1 both sides side slope coverage of road bed, the anti-skidding atress of first support pile part 31, show the anti-skid destructive power that improves low strength soft soil foundation inhomogeneity, thereby increase low strength soft soil foundation overall stability, reduce the soft weak of low strength soft soil gene foundation, the not enough and road bed unstability's that causes of reinforced structure overall stability probability.
Example 4
As shown in fig. 1 and 2, the present embodiment discloses a roadbed system using the roadbed component according to embodiment 3, which includes a foundation 4, wherein the roadbed 1 is disposed on the foundation 4, and the lower end of the first support pile part 31 and the lower end of the first reinforced pile foundation component 2 both extend into the foundation 4.
When the roadbed system adopting the roadbed component is used, the first reinforced pile foundation component 2 is arranged in the foundation 6 covered by the roadbed top surface 12 and is used for supporting the middle part of the roadbed 1; laying the support frames 32 in the foundation 6 in the coverage area of the slopes on the two sides of the roadbed, and supporting the support frames 32 by using the first support pile parts 31, so that the support frames 32 can support the slope parts on the two sides of the roadbed 1; support frame 32 and first support pile part 31 rigid connection, just support frame 32 is overall structure, thereby make the top of the at least partly first support pile part 31 of side slope bottom connect for a whole, thereby reduce the bending stress of the single support pile of side slope annex, the bending stress of averaging support pile, promote the effect such as supporting pile collaborative anti-skidding, effectively reduced in the ground of 1 both sides side slope coverage of road bed, the anti-skidding atress of first support pile part 31, show the anti-skid destructive power that improves low strength soft soil foundation inhomogeneity, thereby increase low strength soft soil foundation overall stability, reduce the soft weak of low strength soft soil gene foundation, the not enough and road bed unstability's that causes of reinforced structure overall stability probability.
On the basis, in a further preferable mode, the foundation 4 includes a foundation soft soil layer 41 and a foundation support layer 42 arranged from top to bottom, and the lower end of the first support pile member 31 extends into the foundation support layer 42.
Example 5
As shown in fig. 1 and 2, this embodiment discloses a construction method for forming the roadbed system according to embodiment 4, which includes the following steps:
excavating a groove for placing the support frame 32 on the foundation 4;
performing construction of the first support pile member 31 at the bottom of the groove;
constructing the support frame 32 in the groove, so that the top of the support frame 32 is flush with the top of the foundation 4;
constructing the second reinforced pile foundation assembly 3 on the foundation 4 between the adjacent grooves to form the reinforced structure; and the top of the second reinforced pile foundation component 3 is flush with the top of the support frame 32
And constructing the roadbed 1 on the reinforced structure.
According to the construction method for forming the roadbed system, during construction, firstly, a groove is dug in the foundation 4 to be used for placing the support frame 32, then, the first support pile part 31 is constructed at the bottom of the groove to be used for supporting the support frame 32, after the first support pile part 31 is constructed, the support frame 32 is constructed in the groove, the support frame 32 is rigidly connected with the first support pile part 31, so that the support frame 32 can support slope parts on two sides of the roadbed 1, and the top of the first support pile part 31 and the support frame 32 form a whole; simultaneously with or after the above construction, the second reinforced pile foundation assembly 3 construction is performed on the foundation 4 between the adjacent grooves to dispose the first reinforced pile foundation assembly 2 in the foundation 6 of the area covered by the roadbed top surface 12 for supporting the middle portion of the roadbed 1, and then the roadbed 1 construction is performed on the reinforced structure, thereby completing the construction of the roadbed system.
The beneficial effects of this embodiment: according to the construction method for forming the roadbed system, the support frame 32 is rigidly connected with the first support pile part 31, so that the tops of at least one part of the first support pile parts 31 at the bottom of the side slope are connected into a whole, the bending tensile stress of a single support pile of a side slope accessory is reduced, the bending tensile stress of the support pile is averaged, the synergistic anti-sliding effect of the support piles is promoted, the non-uniformity of the anti-sliding stress of the first support pile part 31 in the foundation in the coverage range of the side slopes on two sides of the roadbed 1 is effectively reduced, the anti-sliding destructive capacity of the low-strength soft soil foundation is obviously improved, the overall stability of the roadbed of the low-strength soft soil foundation is improved, and the probability of roadbed instability caused by the insufficient soft and weak gene foundation of the low-strength soft soil and the overall stability of a reinforced structure is.
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.
Claims (10)
1. The utility model provides a be used for high-speed railway reinforced structure, its characterized in that includes first reinforcement pile foundation subassembly (2) the both sides of first reinforcement pile foundation subassembly (2) are provided with second reinforcement pile foundation subassembly (3) respectively, second reinforcement pile foundation subassembly (3) including first support pile part (31) and with first support pile part (31) rigid connection's support frame (32), support frame (32) set up in first support pile part (31) top, support frame (32) are overall structure.
2. A reinforcement structure for high-speed railways according to claim 1, characterized in that the first support pile member (31) comprises a number of vertically spaced first support piles (311), the first support piles (311) being rigidly connected to the support frame (32).
3. A reinforcing structure for high-speed railways according to claim 2, characterized in that a plurality of pile cap plates (321) corresponding to the first supporting piles (311) are arranged on the supporting frame (32), and the first supporting piles (311) are rigidly connected with the corresponding pile cap plates (321).
4. The reinforcing structure for high-speed railways according to claim 3, characterized in that a reinforcing beam (322) is rigidly connected between adjacent cap plates (321).
5. The reinforcing structure for the high-speed railway according to any one of claims 1 to 4, wherein the first reinforcing pile foundation assembly (2) comprises a plurality of second supporting piles (21) which are vertically arranged at intervals, a pile cap (22) is rigidly connected to the top of the first reinforcing pile foundation assembly (2), and the outer edge of the pile cap (22) extends out of the side wall of the second supporting pile (21).
6. A roadbed component for a high-speed railway, comprising a roadbed (1), wherein the two sides of the roadbed (1) are provided with side slopes (11), and the roadbed (1) is provided with the reinforced structure as claimed in any one of claims 1 to 5 below, wherein the first reinforced pile foundation component (2) is arranged along the length direction of the roadbed (1), the second reinforced pile foundation component (3) is arranged on the two sides of the first reinforced pile foundation component (2), and at least a part of the second reinforced pile foundation component (3) is arranged below the side slopes (11).
7. A roadbed assembly for a high speed railway according to claim 6, characterized in that a cushion layer (5) is arranged between the roadbed (1) and the reinforcing structure, and a first tie bar is arranged in the cushion layer (5), wherein the first tie bar is a bi-directional stretched geogrid.
8. A foundation system using a foundation assembly according to any one of claims 6 or 7, comprising a foundation (4), wherein said foundation (1) is placed on said foundation (4), and wherein the lower end of said first support pile member (31) and the lower end of said first reinforcing pile element (2) both extend into said foundation (4).
9. A foundation system according to claim 8, characterized in that the foundation (4) comprises a soft soil layer (41) and a supporting layer (42) from top to bottom, and the lower end of the first support pile element (31) extends into the supporting layer (42).
10. A construction method for forming a foundation system according to claim 8 or 9, characterized in that it comprises the following steps:
excavating a groove for placing the support frame (32) on the foundation (4);
-performing the construction of the first support pile element (31) at the bottom of the groove;
constructing the support frame (32) in the groove, and rigidly connecting the support frame (32) with the first support pile part (31);
constructing the second reinforced pile foundation assembly (3) on the foundation (4) between the adjacent grooves to form the reinforced structure;
and then constructing the roadbed (1) on the reinforced structure.
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| CN202010086317.7A CN111155368A (en) | 2020-02-11 | 2020-02-11 | Reinforcing structure, roadbed assembly, roadbed system and construction method for high-speed railway |
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| CN202010086317.7A CN111155368A (en) | 2020-02-11 | 2020-02-11 | Reinforcing structure, roadbed assembly, roadbed system and construction method for high-speed railway |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6040413A (en) * | 1983-08-11 | 1985-03-02 | Tenotsukusu:Kk | Improvement of horizontal ground |
| CN202323568U (en) * | 2011-11-16 | 2012-07-11 | 中铁二院昆明勘察设计研究院有限责任公司 | Pipe pile network/beam structure strengthening high-speed railway soft soil subgrade |
| CN205576637U (en) * | 2016-04-06 | 2016-09-14 | 中铁第四勘察设计院集团有限公司 | Processing closes on roadbed structure of existing line soft soil foundation |
| CN212611699U (en) * | 2020-02-11 | 2021-02-26 | 中铁二院工程集团有限责任公司 | Be used for high-speed railway reinforced structure, road bed subassembly and road bed system |
-
2020
- 2020-02-11 CN CN202010086317.7A patent/CN111155368A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6040413A (en) * | 1983-08-11 | 1985-03-02 | Tenotsukusu:Kk | Improvement of horizontal ground |
| CN202323568U (en) * | 2011-11-16 | 2012-07-11 | 中铁二院昆明勘察设计研究院有限责任公司 | Pipe pile network/beam structure strengthening high-speed railway soft soil subgrade |
| CN205576637U (en) * | 2016-04-06 | 2016-09-14 | 中铁第四勘察设计院集团有限公司 | Processing closes on roadbed structure of existing line soft soil foundation |
| CN212611699U (en) * | 2020-02-11 | 2021-02-26 | 中铁二院工程集团有限责任公司 | Be used for high-speed railway reinforced structure, road bed subassembly and road bed system |
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