CN110952389A - Pile combined structure construction method for controlling uneven settlement of transition section of high-speed railway bridge - Google Patents
Pile combined structure construction method for controlling uneven settlement of transition section of high-speed railway bridge Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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Abstract
The invention relates to a construction method of a pile combined structure for controlling uneven settlement of a transition section of a high-speed railway bridge, which comprises the following steps: s1, leveling a construction site, and dividing a road bridge transition section into a near bridge abutment and a far bridge abutment; s2, installing a reinforced concrete pile raft structure on the foundation close to the abutment; s3, installing a plain concrete pile net structure on the foundation of the remote bridge abutment; s4, layering and rolling the roadbed filling materials, and filling the roadbed filling materials to the top of the roadbed bottom layer of the roadbed at the transition section of the road bridge; s5, mounting a cement-soil mixing pile structure on the top of the bottom layer of the roadbed at the transition section of the road bridge; and S6, finishing the filling of the roadbed surface layer of the road bridge transition section. Compared with the prior art, the invention can effectively control the longitudinal uneven settlement of the road and bridge transition section by combining the combination of the cement mixing piles on the roadbed, the reinforced concrete pile raft structure and the plain concrete pile net structure on the foundation treatment and the longitudinal pile spacing with transition change, can realize rigid transition without adopting the filling of the forward and reverse trapezoidal roadbeds, and ensures the construction quality.
Description
Technical Field
The invention relates to the technical field of high-speed railway construction, in particular to a pile combined structure construction method for controlling uneven settlement of a transition section of a high-speed railway bridge.
Background
With the continuous progress of railway technology, the continuous speed increase of passenger trains and the increase of the transportation energy of freight trains are the trend of future development, for high-speed railways, the road-bridge transition section is arranged at the joint of a roadbed and a bridge, the rigidity of a track can be gradually changed, and when trains pass through at high speed, the vibration of the trains and the lines can be reduced, so that the deformation of the line structure is reduced, and therefore, the road-bridge transition section is a key link for the design and construction of the high-speed railways.
However, the road-bridge transition section also restricts the further speed increase of the train, the existing road-bridge transition section roadbed adopts a mode that high-quality fillers are filled into a regular trapezoid and an inverted trapezoid, the construction steps are simple and convenient, but the filling quality of the roadbed fillers is difficult to control, and the construction quality problem is easy to generate, so that the transition of the rigidity difference between the abutment and the roadbed is poor, and obvious longitudinal uneven settlement is caused, at the moment, if the train runs at high speed, the running safety and smoothness of the train are seriously affected, and therefore a more efficient transition form or method is needed to control the uneven settlement of the high-speed railway-bridge transition section.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a construction method of a pile combined structure for controlling the uneven settlement of a transition section of a high-speed railway bridge.
The purpose of the invention can be realized by the following technical scheme: a pile combined structure construction method for controlling uneven settlement of a transition section of a high-speed railway bridge comprises the following steps:
s1, leveling a construction site, and dividing a road and bridge transition section into a near bridge abutment and a far bridge abutment, wherein the near bridge abutment ranges from the edge of the bridge abutment to the position of 40% -50% of the total length of the road and bridge transition section, and the far bridge abutment ranges from the tail end of the near bridge abutment to the tail end of the road and bridge transition section;
s2, pile position lofting measurement is carried out on the foundation close to the bridge abutment, and a reinforced concrete pile raft structure is installed on the foundation close to the bridge abutment;
s3, pile position lofting measurement is carried out on the foundation of the far bridge abutment, and a plain concrete pile net structure is installed on the foundation of the far bridge abutment;
s4, carrying out layered rolling on the roadbed filling by using a vibratory roller, and filling the roadbed filling to the top of the roadbed bottom layer of the transition section of the road bridge;
s5, pile position lofting measurement is conducted on the top of the bottom layer of the roadbed at the transition section of the road bridge, and a cement soil mixing pile structure is installed on the top of the bottom layer of the roadbed at the transition section of the road bridge;
and S6, carrying out layered rolling on the roadbed filling by using a vibratory roller to complete filling of the roadbed surface layer of the road bridge transition section.
Further, the step S2 specifically includes the following steps:
s21, determining that the transverse pile spacing of the reinforced concrete pile is 4 times of the pile diameter of the reinforced concrete pile;
s22, determining that the longitudinal pile spacing of the reinforced concrete pile is 4-5 times of the pile diameter of the reinforced concrete pile, and sequentially increasing and transiting from the head end to the tail end of the bridge abutment;
s23, installing a plurality of reinforced concrete piles at the foundation close to the abutment according to the transverse pile spacing and the longitudinal pile spacing of the reinforced concrete piles;
s24, arranging a gravel cushion layer on the pile top of the reinforced concrete pile, and arranging a reinforced concrete raft plate on the gravel cushion layer.
Further, the pile body intensity of reinforced concrete pile is not less than C30, reinforced concrete pile stake footpath is 500 ~ 600 mm.
Further, the thickness of rubble bed course is 200 ~ 300mm, the thickness of reinforced concrete raft board is 400 ~ 600mm, the intensity of reinforced concrete raft board is not less than C30.
Further, the step S3 specifically includes the following steps:
s31, determining that the transverse pile spacing of the plain concrete pile is 4 times of the pile diameter of the plain concrete pile;
s32, determining that the longitudinal pile spacing of the plain concrete piles is 4-5 times of the pile diameter of the plain concrete piles, and sequentially increasing and transiting from the head end to the tail end of a far bridge abutment;
s33, installing a plurality of plain concrete piles at the foundation far away from the abutment according to the transverse pile spacing and the longitudinal pile spacing of the plain concrete piles;
and S34, arranging a pile cap on the pile top of the plain concrete pile, and arranging a reinforced cushion layer on the pile cap.
Further, the pile body strength of the plain concrete pile is not less than C30, and the pile diameter of the plain concrete pile is 500-600 mm.
Further, the thickness of the reinforcement cushion is 300-600 mm, sand gravel and broken stone are adopted in the reinforcement cushion, and the maximum particle size of the sand gravel and the broken stone is not more than 30 mm.
Further, the step S5 specifically includes the following steps:
s51, arranging a cement soil mixing pile group with a square structure;
s52, determining that the distance between the transverse pile groups of the cement soil mixing pile groups is 2 times of the pile diameter of the cement soil mixing pile groups;
s53, determining that the longitudinal pile group spacing of the cement mixing pile groups is 3-5 times of the pile diameter of the cement mixing pile groups, and sequentially increasing and transiting from the head end of the near bridge abutment to the tail end of the far bridge abutment;
and S54, installing a plurality of cement-soil mixing pile groups on the top of the foundation bed bottom layer of the road-bridge transition section according to the transverse pile group spacing and the longitudinal pile group spacing of the cement-soil mixing pile groups.
Furthermore, the side length of the cement-soil mixing pile group is 3 times of the pile diameter of the cement-soil mixing pile, the pile diameter of the cement-soil mixing pile is 500mm, and the cement-soil mixing pile is made of ordinary portland cement with the strength grade being greater than or equal to 42.5.
Further, the roadbed filling materials in the steps S4 and S6 are the same as the roadbed filling materials in the general section of the line.
Compared with the prior art, the invention has the following advantages:
according to the invention, the road and bridge transition section foundation is divided into a near bridge abutment and a far bridge abutment, a reinforced concrete pile raft structure and a plain concrete pile net structure are respectively installed on the foundation of the near bridge abutment and the foundation of the far bridge abutment, and longitudinal pile intervals for sequentially increasing the transition are correspondingly arranged, so that longitudinal differential settlement of the road and bridge transition section can be effectively controlled, and the driving smoothness of the road and bridge transition section is improved.
The invention respectively carries out different pile body direct reinforcement on the foundation and the roadbed of the road and bridge transition section, wherein the foundation adopts the combination of a reinforced concrete pile raft structure and a plain concrete pile net structure, the roadbed adopts a cement soil mixing pile structure, and the longitudinal pile spacing is ensured to be sequentially increased and transited, so that the longitudinal rigidity of the whole road and bridge transition section is also transited, therefore, the rigidity transition from the road foundation section to the bridge abutment section is not required to be realized according to the form of a forward and reverse trapezoidal roadbed, and the construction quality problem of filling the forward and reverse trapezoidal roadbeds is also avoided.
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FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the construction effect of the longitudinal section of the transition section of the road and bridge in the embodiment;
FIG. 3 is a schematic view of the foundation treatment construction effect of the transition section of the road and bridge in the embodiment;
FIG. 4 is a schematic diagram of the construction effect of a roadbed cement-soil mixing pile structure at the transition section of the road and bridge in the embodiment;
FIG. 5 is a schematic diagram of the cross section construction effect of the road and bridge transition section in the embodiment;
the notation in the figure is: 1. the method comprises the following steps of 1, preparing a roadbed bed surface layer, 2, a roadbed bed bottom layer and a roadbed below the roadbed, 3, a reinforced concrete raft, 4, a gravel cushion layer, 5, a reinforced concrete pile, 6, a reinforced cushion layer, 7, a plain concrete pile and 8, and a cement mixing pile.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, a construction method of a pile combination structure for controlling uneven settlement of a transition section of a high-speed railway bridge comprises the following steps:
s1, leveling a construction site, and dividing a road and bridge transition section into a near bridge abutment and a far bridge abutment, wherein the near bridge abutment ranges from the edge of the bridge abutment to the position of 40% -50% of the total length of the road and bridge transition section, and the far bridge abutment ranges from the tail end of the near bridge abutment to the tail end of the road and bridge transition section;
s2, pile position lofting measurement is carried out on the foundation close to the bridge abutment, and a reinforced concrete pile raft structure is installed on the foundation close to the bridge abutment;
s3, pile position lofting measurement is carried out on the foundation of the far bridge abutment, and a plain concrete pile net structure is installed on the foundation of the far bridge abutment;
s4, carrying out layered rolling on the roadbed filling by using a vibratory roller, and filling the roadbed filling to the top of the roadbed bottom layer of the transition section of the road bridge;
s5, pile position lofting measurement is conducted on the top of the bottom layer of the roadbed at the transition section of the road bridge, and a cement soil mixing pile structure is installed on the top of the bottom layer of the roadbed at the transition section of the road bridge;
and S6, carrying out layered rolling on the roadbed filling by using a vibratory roller to complete filling of the roadbed surface layer of the road bridge transition section.
Specifically, the construction method provided by the invention mainly comprises the following four processes:
firstly, foundation treatment is carried out by adopting a mode of combining a reinforced concrete pile raft structure with a plain concrete pile net structure
Before construction, firstly leveling a field, accurately carrying out pile position lofting measurement, dividing a road and bridge transition section into a near bridge abutment section and a far bridge abutment section according to the total length of the road and bridge transition section, wherein the near bridge abutment section starts from the edge of the bridge abutment, the length of the near bridge abutment is 40-50% of the total length of the transition section, a reinforced concrete raft structure is adopted for foundation treatment of the near bridge abutment, the strength of a pile body is not less than C30, the pile diameter is 500-600 mm, the distance between fixed piles in the transverse direction is 4 times of the pile diameter, the longitudinal pile distance is transited in the direction far away from the bridge abutment according to 4-5 times of the pile diameter, a 200-300 mm broken stone cushion layer is arranged on the pile top, and a reinforced concrete raft plate with the thickness of 400-600 mm and the strength of not less than C30 is arranged on;
the far bridge abutment section starts from the tail end of the near bridge abutment, the length of the far bridge abutment is 50-60% of the total length of the transition section, a plain concrete pile net structure is adopted for foundation treatment of the far bridge abutment, the strength of a pile body is not less than C30, the pile diameter is 500-600 mm, the fixed pile spacing is 4 times of the pile diameter in the transverse direction, the longitudinal pile spacing is in transition in the direction of being away from the bridge abutment according to 3-5 times of the pile diameter, a pile cap and a 300-600 mm reinforced cushion layer are arranged at the pile top, the cushion layer material is sand gravel and broken stone, and the maximum grain diameter is not more than 30 mm;
for the foundation processed by the pile-raft structure, the distance between the central line of the first row of piles and the end part of a raft board close to the central line in the longitudinal direction is not more than 2 times of pile diameter, the pile interval of the first 3 or 4 rows of piles is taken as 4 times of pile diameter, the first-stage pile interval is adopted, the pile interval is gradually increased when the foundation is transited to the far end, each stage can be selected from 150mm, 200mm and 300mm from the second stage when being increased compared with the previous stage, the increase value is ensured to be monotonous and not reduced when being selected, the pile interval of each stage is enabled to appear once, and if the pile interval is increased to the maximum stage (namely 5 times of pile diameter), the piles are arranged far to the tail part of a bridge abutment section according;
for the foundation processed by the pile network structure, the distance between the central line of the first row of piles and the end part of the reinforcement cushion layer close to the first row of piles in the longitudinal direction is not more than 3 times of the pile diameter, the pile distance of the first 3 or 4 rows of piles is taken as 4 times of the pile diameter and is the first-stage pile distance, when the foundation is transited to the far end, the pile distance is gradually increased, from the second stage, each stage is increased compared with the last stage and can be selected from 150mm, 200mm and 300mm, the increase value is ensured to be monotonous and not reduced when the pile distance is selected, the pile distance of each stage is enabled to appear once, and if the pile distance is increased to the maximum stage (namely 5 times of the pile diameter), the piles are arranged far;
the pile spacing between the reinforced concrete piles in the last row close to the bridge abutment and the plain concrete piles in the first row far from the bridge abutment can be selected to be a value within the range of 3-4 times of the average pile diameter of the two piles.
Secondly, filling and rolling roadbed fillers to the top of the bottom layer of the foundation bed in a layered manner
Compared with the common road sections of the lines, the conventional forward and reverse trapezoidal subgrades at the transition section of the high-speed railway bridge have higher compaction standards when being filled; compared with various alternatives of roadbed filling in general road sections of lines, the conventional forward and reverse trapezoidal roadbeds usually adopt graded broken stones doped with not less than 3% of cement as filling materials of the foundation bed bottom layer and the roadbed below the bottom layer, and due to the existence of the forward and reverse trapezoids, the two differences can cause that the filling materials need to be continuously replaced and equipment construction parameters need to be adjusted when the filling materials are filled and rolled in a layered mode, so that the construction process is complicated and inconvenient, and the filling quality is not easy to control;
in the invention, the selection and compaction of the roadbed filler at the transition section are the same as those of the ordinary road section of the line, which is beneficial to enhancing the uniformity of the roadbed bottom layer and the roadbed below the bottom layer, and under the condition of reinforcing the roadbed and the foundation by combining piles, the defects of the forward and reverse trapezoidal roadbeds are avoided while the transition function is ensured.
Thirdly, carrying out cement soil mixing pile construction from the top of the bottom layer of the foundation bed
Pile position lofting measurement is accurately carried out on the top of the bottom layer of the foundation bed, square structural cement soil mixing pile groups with the side length of 1.5m and the pile diameter of 500mm are arranged, each group consists of 4 cement soil mixing piles, the cement soil mixing piles are distributed at four corners of a square, the clear distance between longitudinal pile groups is 3-5 times of the pile diameter, namely 1.5-2.5 m, common portland cement with the strength grade of 42.5 and above is selected for the cement soil mixing piles, the cement mixing amount can be 12% -20% of the mass of the reinforced wet soil, the water cement ratio is 0.45-0.55, the method is different from a method for reinforcing a composite foundation in foundation treatment, and no cushion layer is arranged on the pile top.
Fourthly, filling and rolling the surface layer of the foundation bed
And selecting the roadbed surface layer filler of the common road section of the line to complete the filling of the roadbed surface layer of the transition section.
In the embodiment, the total length of the road and bridge transition section is 27.1m, the near bridge abutment is 12m, the far bridge abutment is 15.1m, a bulldozer and an excavator are used for leveling the ground before construction, pile position lofting measurement is accurately carried out, and the error is not more than 5 cm. Fig. 2 is a schematic diagram showing the construction effect of the longitudinal section of the transition section of the road and bridge, wherein the reinforced concrete rafts 3, the broken stone cushions 4 and the reinforced concrete piles 5 are sequentially arranged at the foundation near the abutment from top to bottom, the reinforced cushions 6 and the plain concrete piles 7 are sequentially arranged at the foundation far from the abutment from top to bottom, and the cement mixing piles 8 are arranged between the surface layer of the roadbed of the transition section and the foundation.
In this embodiment, for the reinforced concrete raft structure, pile body design is performed according to a reinforced concrete cast-in-place pile with the strength of C30 and the pile diameter of 600mm, pile positions are arranged in a rectangular manner, as shown in fig. 3, the transverse pile spacing of the pile is fixed to be 2.4m, and the longitudinal pile spacing is respectively 2.4m, 2.6m and 2.8m from left to right; for the plain concrete pile net structure, pile body design is carried out according to plain concrete piles with the strength of C30 and the pile diameter of 600mm, pile positions are arranged in a rectangular mode, as shown in figure 3, the transverse pile spacing of the piles is fixed to be 2.4m, and the longitudinal pile spacing is respectively 2.4m, 2.6m, 2.8m and 3.0m from left to right; the pile spacing between the reinforced concrete piles in the last row close to the bridge abutment and the plain concrete piles in the first row far from the bridge abutment is 2.0 m.
For the reinforced concrete pile close to the bridge abutment, a gravel cushion layer with the thickness of 200mm is paved on the pile top, the material is gravel or gravel which is hard in texture, difficult to weather and good in gradation, the maximum grain diameter is not more than 50mm, the mud content is not more than 5%, the compaction quality of the cushion layer is controlled according to the filling requirement of the roadbed body, and then a reinforced concrete raft with the thickness of 400mm and the strength of C30 is arranged on the gravel cushion layer;
for a plain concrete pile far away from an abutment, a reinforced concrete square pile cap with the length and width of 1000mm, the height of 300mm and the strength of C30 is arranged at the pile top, and a reinforced cushion layer with the thickness of 300mm is paved at the pile cap top and is made of sand gravel, broken stone and the like with the maximum grain diameter of not more than 30 mm.
Then selecting the same filler as the common road section of the line for filling, carrying out layered rolling on the road foundation filler by using a vibratory roller, wherein each layer is 25cm, the compaction standard is the same as the common road section of the line, filling the road foundation filler to the top of the bottom layer of the foundation bed, reinforcing the foundation bed bottom layer and the roadbed below the bottom layer in the form of a cement-soil mixing pile group, and realizing transition by adjusting the distance between groups, as shown in figure 4, each group of cement-soil mixing piles consists of 4 cement-soil mixing piles with the pile diameter of 500mm, the material is common silicate cement with the strength grade of 42.5 grade and above, the cement mixing amount can be 16 percent of the mass of the reinforced wet soil, the water cement ratio is 0.5, each group is arranged according to a square with the side length of 1.5m, the 4 piles are distributed at the four corners of the square, the pile body is also arranged by taking the group as a unit during construction, the minimum distance between the cement-soil mixing piles and the edge of the bridge abutment, the transverse inter-group clear distance of the pile group is fixed to be 1.0m, and the longitudinal inter-group clear distance is respectively 1.5m, 2.0m and 2.5m from left to right.
And finally, selecting roadbed foundation bed surface layer fillers identical to the roadbed foundation bed surface layers of the general sections of the lines to complete filling and rolling of the roadbed foundation bed surface layers of the transition sections, wherein the compaction standard is identical to the roadbed foundation bed surface layers of the general sections of the lines, and the final cross section construction effect of the bridge transition sections is shown in fig. 5.
Claims (10)
1. A pile combined structure construction method for controlling uneven settlement of a transition section of a high-speed railway bridge is characterized by comprising the following steps:
s1, leveling a construction site, and dividing a road and bridge transition section into a near bridge abutment and a far bridge abutment, wherein the near bridge abutment ranges from the edge of the bridge abutment to the position of 40% -50% of the total length of the road and bridge transition section, and the far bridge abutment ranges from the tail end of the near bridge abutment to the tail end of the road and bridge transition section;
s2, pile position lofting measurement is carried out on the foundation close to the bridge abutment, and a reinforced concrete pile raft structure is installed on the foundation close to the bridge abutment;
s3, pile position lofting measurement is carried out on the foundation of the far bridge abutment, and a plain concrete pile net structure is installed on the foundation of the far bridge abutment;
s4, carrying out layered rolling on the roadbed filling by using a vibratory roller, and filling the roadbed filling to the top of the roadbed bottom layer of the transition section of the road bridge;
s5, pile position lofting measurement is conducted on the top of the bottom layer of the roadbed at the transition section of the road bridge, and a cement soil mixing pile structure is installed on the top of the bottom layer of the roadbed at the transition section of the road bridge;
and S6, carrying out layered rolling on the roadbed filling by using a vibratory roller to complete filling of the roadbed surface layer of the road bridge transition section.
2. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge as claimed in claim 1, wherein the step S2 specifically comprises the following steps:
s21, determining that the transverse pile spacing of the reinforced concrete pile is 4 times of the pile diameter of the reinforced concrete pile;
s22, determining that the longitudinal pile spacing of the reinforced concrete pile is 4-5 times of the pile diameter of the reinforced concrete pile, and sequentially increasing and transiting from the head end to the tail end of the bridge abutment;
s23, installing a plurality of reinforced concrete piles at the foundation close to the abutment according to the transverse pile spacing and the longitudinal pile spacing of the reinforced concrete piles;
s24, arranging a gravel cushion layer on the pile top of the reinforced concrete pile, and arranging a reinforced concrete raft plate on the gravel cushion layer.
3. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge, according to claim 2, is characterized in that the strength of the pile body of the reinforced concrete pile is not less than C30, and the pile diameter of the reinforced concrete pile is 500-600 mm.
4. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge, according to claim 2, is characterized in that the thickness of the gravel cushion layer is 200-300 mm, the thickness of the reinforced concrete raft plate is 400-600 mm, and the strength of the reinforced concrete raft plate is not less than C30.
5. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge as claimed in claim 1, wherein the step S3 specifically comprises the following steps:
s31, determining that the transverse pile spacing of the plain concrete pile is 4 times of the pile diameter of the plain concrete pile;
s32, determining that the longitudinal pile spacing of the plain concrete piles is 4-5 times of the pile diameter of the plain concrete piles, and sequentially increasing and transiting from the head end to the tail end of a far bridge abutment;
s33, installing a plurality of plain concrete piles at the foundation far away from the abutment according to the transverse pile spacing and the longitudinal pile spacing of the plain concrete piles;
and S34, arranging a pile cap on the pile top of the plain concrete pile, and arranging a reinforced cushion layer on the pile cap.
6. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge, according to claim 5, is characterized in that the pile body strength of the plain concrete pile is not less than C30, and the pile diameter of the plain concrete pile is 500-600 mm.
7. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge, according to claim 6, is characterized in that the thickness of the reinforcement cushion is 300-600 mm, sand gravel and broken stones are adopted for the reinforcement cushion, and the maximum particle size of the sand gravel and the broken stones is not more than 30 mm.
8. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge as claimed in claim 1, wherein the step S5 specifically comprises the following steps:
s51, arranging a cement soil mixing pile group with a square structure;
s52, determining that the distance between the transverse pile groups of the cement soil mixing pile groups is 2 times of the pile diameter of the cement soil mixing pile groups;
s53, determining that the longitudinal pile group spacing of the cement mixing pile groups is 3-5 times of the pile diameter of the cement mixing pile groups, and sequentially increasing and transiting from the head end of the near bridge abutment to the tail end of the far bridge abutment;
and S54, installing a plurality of cement-soil mixing pile groups on the top of the foundation bed bottom layer of the road-bridge transition section according to the transverse pile group spacing and the longitudinal pile group spacing of the cement-soil mixing pile groups.
9. The construction method of the pile combination structure for controlling the uneven settlement of the transition section of the high-speed railway bridge as claimed in claim 8, wherein the side length of the cement-soil mixing pile group is 3 times of the pile diameter of the cement-soil mixing pile, the pile diameter of the cement-soil mixing pile is 500mm, and the cement-soil mixing pile is made of ordinary portland cement with the strength grade greater than or equal to 42.5.
10. The method of claim 1, wherein the roadbed filling material in the steps S4 and S6 is the same as the roadbed filling material in the general section of the line.
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| CN112211040A (en) * | 2020-09-29 | 2021-01-12 | 同济大学 | Composite pile plate structure of track-joining engineering roadbed and construction method |
| CN112211052A (en) * | 2020-09-29 | 2021-01-12 | 中南大学 | Long and short pile-plate structure for controlling uneven settlement of transition section of highway and construction method thereof |
| CN113931212A (en) * | 2021-11-25 | 2022-01-14 | 中铁四院集团西南勘察设计有限公司 | Road and bridge transition section structure for tramcar and construction method thereof |
| CN114737490A (en) * | 2021-11-25 | 2022-07-12 | 上海建工集团股份有限公司 | Comprehensive treatment device and method for bridge head part suitable for coastal hydraulic reclamation area |
| CN115839045A (en) * | 2022-12-15 | 2023-03-24 | 中铁西北科学研究院有限公司 | Roadbed uneven settlement deformation area renovation process and frozen soil renovation roadbed structure |
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| CN112211040A (en) * | 2020-09-29 | 2021-01-12 | 同济大学 | Composite pile plate structure of track-joining engineering roadbed and construction method |
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| CN114737490B (en) * | 2021-11-25 | 2023-09-08 | 上海建工集团股份有限公司 | Bridge head part comprehensive treatment device and method suitable for coastal hydraulic reclamation area |
| CN115839045A (en) * | 2022-12-15 | 2023-03-24 | 中铁西北科学研究院有限公司 | Roadbed uneven settlement deformation area renovation process and frozen soil renovation roadbed structure |
| CN115839045B (en) * | 2022-12-15 | 2023-10-20 | 中铁西北科学研究院有限公司 | Roadbed differential settlement deformation region remediation process and frozen soil remediation roadbed structure |
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