CN111270570B - Overhead soilless roadbed structure, roadbed assembly, roadbed system and construction method - Google Patents
Overhead soilless roadbed structure, roadbed assembly, roadbed system and construction method Download PDFInfo
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- CN111270570B CN111270570B CN202010183522.5A CN202010183522A CN111270570B CN 111270570 B CN111270570 B CN 111270570B CN 202010183522 A CN202010183522 A CN 202010183522A CN 111270570 B CN111270570 B CN 111270570B
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- 238000010276 construction Methods 0.000 title claims abstract description 77
- 239000012791 sliding layer Substances 0.000 claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims description 45
- 239000002699 waste material Substances 0.000 claims description 38
- 239000002893 slag Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000004567 concrete Substances 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000000945 filler Substances 0.000 abstract description 16
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 239000002689 soil Substances 0.000 description 22
- 230000002411 adverse Effects 0.000 description 19
- 230000000694 effects Effects 0.000 description 18
- 238000012423 maintenance Methods 0.000 description 14
- 238000011065 in-situ storage Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 102100040287 GTP cyclohydrolase 1 feedback regulatory protein Human genes 0.000 description 1
- 101710185324 GTP cyclohydrolase 1 feedback regulatory protein Proteins 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000003908 quality control method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Classifications
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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
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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
- E01B2/006—Deep foundation of tracks
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Abstract
The invention belongs to the field of geotechnical engineering, and particularly relates to an overhead soilless roadbed structure, a roadbed assembly, a roadbed system and a construction method, wherein the roadbed structure comprises a bearing plate, a plurality of joists are arranged at the bottom of the bearing plate at intervals along the length direction of the bearing plate, the joists can limit the transverse displacement of the bearing plate, at least two pile foundations are arranged at the bottom of each joist at intervals along the length direction of the joist, a sliding layer is arranged between two joists positioned at the outermost side and the corresponding bearing plate along the length direction of the bearing plate, the sliding layer is used for sliding between the joists and the bearing plate relatively, and at least one joist of the rest joists is rigidly connected with the bearing plate. The overhead soilless roadbed structure has the advantages of small foundation treatment engineering quantity, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.
Description
Technical Field
The invention belongs to the field of geotechnical engineering, and particularly relates to an overhead soilless roadbed structure, a roadbed assembly, a roadbed system and a construction method.
Background
The high-speed railway has extremely high post-construction settlement requirements on the roadbed, and in order to control post-construction settlement and meet the requirements of high-speed railway safety operation and comfort, the existing railway roadbed often adopts very strong foundation treatment measures, especially for filled roadbed sections. The method is characterized in that a trapezoid type is adopted in a high-speed railway roadbed filling section, slopes are arranged on two sides of the high-speed railway roadbed filling section to the ground, foundation treatment is carried out on the ground, and patents such as a buried joist pile board structure (CN 103397656A), a four-wire ballastless track roadbed pile board structure (CN 204644799U), a construction method for reinforcing a newly-built railway karst foundation and a roadbed structure thereof (CN 105696427A), a prefabricated GFRP tube concrete pile and a concrete slab overhead roadbed pile board structure (CN 108824097A) and the like are all adopted for controlling post-construction settlement of the railway roadbed.
The roadbed structure form of filling soil and foundation treatment has the advantages of small settlement after construction and high operation comfort, and is a roadbed structure form commonly used at home and abroad. However, the structural form directly causes the increase of the area of foundation treatment and the deep treatment depth due to the increase of the occupied area and the filled load after filling, thereby causing larger engineering investment; the structure requires a large amount of qualified filler, and the filler is difficult to source and the price is continuously increased due to the problems of environmental protection, distance of transportation and the like, and the problem is particularly prominent in the plain area of the middle east; the occupied land width of the structural form is several times of the roadbed surface width, the land reclamation amount is large, the investment is high, and the structure is particularly suitable for urban areas and cultivated land sections.
Therefore, there is an urgent need for an environment-friendly and economical high-speed railway roadbed structure with small engineering amount of foundation treatment, small occupied area, less filler consumption and more controllable construction quality, which is used for replacing the existing roadbed structure of 'filling and foundation treatment'.
Disclosure of Invention
The invention aims at: aiming at the problems of large foundation treatment area, occupation of a large amount of roadbed filler and high construction cost existing in the roadbed structure form of 'filling soil + foundation treatment' in the prior art, the occupied area is several times of the roadbed surface width, the overhead soilless roadbed structure, the roadbed assembly, the roadbed system and the construction method are provided, and the construction method is low in foundation treatment engineering quantity, small in occupied area, less in filler consumption, more controllable in construction quality, environment-friendly and lower in construction cost on the premise of safety and stability.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
An overhead soilless roadbed structure comprises a bearing plate, a plurality of joists are arranged at the bottom of the bearing plate, all joists are arranged at intervals along the length direction of the bearing plate, the joists can limit the transverse displacement of the bearing plate, at least two pile foundations are connected at intervals at the bottom of each joist along the length direction of the joist,
And a sliding layer is arranged between the two joists positioned at the outermost side and the corresponding bearing plate in the length direction of the bearing plate, the sliding layer is used for sliding relatively between the joists and the bearing plate, and at least one joist of the rest joists is connected with the bearing plate.
The invention discloses an overhead soilless roadbed structure, which comprises a bearing plate, wherein a plurality of joists are arranged at the bottom of the bearing plate along the length direction of the bearing plate, the joists can limit the transverse displacement of the bearing plate, at least two pile foundations are arranged at the bottom of each joist along the length direction of the joist at intervals, when the overhead soilless roadbed structure is used, the lower end of each pile foundation is buried in a foundation, only a small amount of foundation surface is exposed, the whole structure does not need any roadbed filling material, a small amount of waste soil (generated when pile foundations are drilled), the adverse effect of the waste soil on the environment is greatly reduced, the engineering investment is saved, the environment is also protected, meanwhile, the treatment width of the foundation is only in the width range of a roadbed base, the problem that the traditional roadbed structure is formed by filling soil + foundation treatment is wide is solved, a large amount of land resources are saved, the excessive land is avoided, meanwhile, the engineering investment is also saved, the pile foundations are arranged on the bearing plate and the pile foundations are not in contact with the joists, the conventional roadbed structure is easy to control the quality and the quality of the foundation, and the foundation is easy to control and the quality of the foundation is easy to be maintained, and the foundation is easy to control and the quality is easy to be controlled.
The joists can limit the transverse displacement of the bearing plate, and at least one of the joists in the middle of the lower part of the bearing plate is connected with the bearing plate in the length direction of the bearing plate so as to ensure the stability between the bearing plate and the joists,
The sliding layer is arranged between the two joists positioned at the outermost side and the corresponding bearing plate, so that longitudinal relative dislocation and deformation can be allowed to occur between the bearing plate and the joists, at least one of the rest joists is connected with the bearing plate, the relative stability between the bearing plate and the joists can be ensured, the special requirements of the high-speed railway roadbed can be met, the safety and stability of the overhead soilless roadbed structure can be ensured, and meanwhile, the stress concentration of pile foundations at the bottom of the joists on the bearing plate can be reduced, so that the stress in the bearing plate is uniform and reasonable according to the requirement, and meanwhile, the upper load can be better transferred to the foundation at the lower part.
In conclusion, the overhead soilless roadbed structure disclosed by the invention has the advantages of small foundation treatment engineering quantity, small occupied area, small filler consumption, more controllable construction quality, environmental friendliness and lower construction cost.
Preferably, a transverse tie beam is connected between two adjacent pile foundations at the bottom of the same joist, and a longitudinal tie beam is connected between the corresponding pile foundations at the bottom of the adjacent joist.
In a curve section, in order to better resist adverse effects of centrifugal force, a transverse tie beam is connected between two adjacent pile foundations at the bottom of the same joist, and a longitudinal tie beam is connected between the corresponding pile foundations at the bottom of the adjacent joist;
preferably, flanges extending upwards are arranged at two ends of the joist, and the flanges are used for limiting the transverse displacement of the bearing plate.
The lateral movement of the bearing plate to two sides is limited by the flanges, so that the bearing plate is ensured to be stable laterally relative to the joist.
In the prior art, the roadbed structure form of filling soil and foundation treatment is filled with filling construction, so that uneven settlement of auxiliary structures such as cable grooves and the like and main structures often occurs in the use process, and as a result, the auxiliary structures such as the cable grooves and the like are often damaged and accumulated water on a roadbed surface infiltrates into roadbed filling soil; in addition, the construction process of roadbed filling and rolling is greatly influenced by weather change, the construction quality is not easy to control, and the problem of spoil caused by excavation of foundation is often generated during foundation treatment.
Preferably, the two sides of the bearing plate are provided with protective walls, the outer sides of the protective walls are provided with protective rails, an overhaul channel is arranged between the protective rails and the protective walls, a cable groove vertical wall is arranged below the overhaul channel, and the protective rails and the cable groove vertical wall are connected with the bearing plate;
the bearing plate is provided with a water draining hole in a penetrating mode, the bottom of the bearing plate is provided with a water draining device, the water draining device is communicated with the water draining hole, the water draining device is connected with the bearing plate, at least one joist connected with the bearing plate is connected with the water draining device, and the water draining hole is formed in the inner side of the protective wall.
The two sides of the bearing plate are provided with the protective walls, so that the derailment of the train can be effectively prevented.
Because the structure of the high-speed railway can generate larger vibration under the action of train dynamic load, the drain pipe is fixed on the main structure, and the damage caused by the relative movement of the drain pipe and the main structure can be avoided;
Because the bearing plate, the joist connected with the bearing plate and the pile foundation below the joist are connected into a whole, the drainage is led into the ground through the joist connected with the bearing plate, the relative displacement is small, and the drainage device can be effectively protected;
If the drainage device is connected to the joist provided with the sliding layer, the drainage device is damaged due to the fact that large relative longitudinal deformation occurs between the joist and the bearing plate;
therefore, the arrangement mode of the drainage device can ensure the safety and durability of the whole drainage system (drain hole and drainage device) of the overhead soilless roadbed structure, and is more effective and attractive compared with scattered drainage.
The outer side of the protective wall is provided with a protective railing, so that the protective railing can play a role in protecting maintenance personnel and cables; a cable groove vertical wall is arranged below the overhaul channel, so that communication, signal and power cables can be separated, and the use requirements of the post-railway station profession are met; the protection railing with be provided with the maintenance passageway between the protection wall, the cable duct erects the wall and is located the maintenance passageway below can make things convenient for the maintenance and the maintenance in railway later stage to protect the cable in the cable duct well.
The auxiliary structures such as the protective wall, the cable groove vertical wall and the protective railing are fixed on the bearing plate, so that the protective wall, the cable groove vertical wall and the protective railing are integrated with the bearing plate, differential settlement of the auxiliary structures and the bearing plate is avoided, and the problem that the auxiliary structures such as the protective wall, the cable groove vertical wall and the protective railing are damaged due to uneven settlement is solved.
Preferably, the two sides of the bearing plate are provided with protective walls, the protective walls are provided with cable grooves, and the protective walls can effectively prevent the train from derailing and can be used as vertical walls of the cable grooves.
The invention also discloses a roadbed assembly, which comprises at least two overhead soilless roadbed structures spliced in sequence along the length direction of the bearing plates, wherein transverse expansion joints are arranged between adjacent bearing plates.
According to the roadbed assembly, the transverse expansion joints are matched with the sliding layer, so that when at least one overhead soilless roadbed structure is spliced in sequence along the length direction of the bearing plate, longitudinal relative dislocation and deformation between the bearing plate and the joist can be allowed, and adverse effects of temperature and shrinkage creep in the structure are reduced.
The invention also discloses a roadbed system adopting the overhead soilless roadbed structure, which comprises a foundation and a track structure, wherein the lower end of the pile foundation is buried in the foundation, a gap exists between the foundation and the bearing plate, and the track structure is arranged on the top surface of the bearing plate.
The roadbed system is characterized in that the lower end of the pile foundation is embedded into the foundation, the surface of the foundation is only required to be exposed in a small amount, the whole structure does not need any roadbed filler, a small amount of spoil (generated during pile foundation drilling) is generated, the adverse effect of spoil on the environment is greatly reduced, engineering investment is saved, the environment is also protected, meanwhile, the treatment width of the foundation is only in the range of the width of a roadbed surface because only the pile foundation is connected with the foundation, the problems of wide treatment width and wide occupation area of the foundation in the traditional roadbed structure form of 'filling soil + foundation treatment' are solved, a large amount of land resources are saved, excessive land reclamation is avoided, engineering investment is also saved, and because of pile foundation properties, bearing plates and joists on the pile foundation are arranged on the pile foundation, gaps exist between the foundation and the bearing plates, the bearing plates and the bearing plates are not contacted with the foundation.
Preferably, the foundation is provided with a waste slag filling body, the waste slag filling body is located below the bearing plate, and a gap exists between the waste slag filling body and the bearing plate.
The small amount of waste soil generated during the construction of the roadbed system is utilized in situ, so that adverse effects of waste soil taking on the environment are avoided, engineering investment is saved, the environment is protected, and meanwhile, the pile foundation is reinforced by the waste slag filling body, so that the overhead soilless roadbed structure is more stable.
Preferably, when a transverse tie beam is connected between two adjacent pile foundations at the bottom of the same joist, and a longitudinal tie beam is connected between the pile foundations at the bottom of the same joist, the top ends of the transverse tie beams and the top ends of the longitudinal tie beams are flush with the surface of the foundation, so that the whole structure is more stable and attractive.
The invention also discloses a construction method for forming the roadbed system, which comprises the following steps:
s1: performing the pile foundation construction on a foundation, and enabling the top of the pile foundation to emerge from the foundation;
s2: carrying out joist construction on the top of the pile foundation, carrying out sliding layer construction on the tops of two joists positioned at the outermost side along the length direction of the bearing plate, and carrying out connection reinforcing steel bar construction on at least one joist of the rest joists, wherein the connection reinforcing steel bars extend out of the tops of the joists, and a gap exists between the bearing plate and the foundation;
S3: and carrying out construction of the bearing plate, wherein the connecting steel bars are connected with a steel bar cage in the bearing plate.
According to the construction method for forming the roadbed system, the lower end of the pile foundation is buried in the foundation, only a small amount of roadbed filler is needed to be exposed out of the surface of the foundation, the whole structure does not need any roadbed filler, a small amount of spoil (generated during pile foundation drilling) is generated, adverse effects of spoil on the environment are greatly reduced, engineering investment is saved, the environment is protected, meanwhile, the treatment width of the foundation is only in the range of the width of a roadbed due to the fact that only the pile foundation is connected with the foundation, the problems of wide foundation treatment width and wide occupation area of a traditional roadbed structure form of filling soil and foundation treatment are solved, a large amount of land resources are saved, excessive land reclamation is avoided, meanwhile, engineering investment is also saved, due to the pile foundation property, bearing plates and supporting beams on the pile foundation are arranged on the pile foundation, gaps exist between the foundation and the bearing plates, and the supporting beams can be located above the surface of the foundation during use, and the construction quality is controllable, reliable and convenient to check and maintenance, and the problem of poor control of the traditional filling soil and foundation treatment is solved.
Preferably, when a transverse beam is connected between two adjacent pile foundations at the bottom of the same joist, and a longitudinal beam is connected between two adjacent pile foundations at the bottom of the joist, the step S1 specifically comprises:
S11: digging a pile foundation pit, and constructing a pile foundation underground part;
S12: excavating the transverse tie beam and the longitudinal tie beam foundation pit, and binding the transverse tie beam reinforcement cages and the longitudinal tie beam reinforcement cages;
S13: and (3) integrally pouring concrete of the overground part of the pile foundation, the transverse tie beam and the longitudinal tie beam, and completing construction of the transverse tie beam, the longitudinal tie beam and the pile foundation.
Preferably, the step S3 is followed by the construction of a waste slag filling body:
and filling the drilled waste slag of the pile foundation on the surface of the foundation below the bearing plate to form a waste slag filling body, wherein a gap exists between the waste slag filling body and the bearing plate.
The small amount of waste soil generated during pile foundation construction is utilized in situ, so that adverse effects of the waste soil on the environment are avoided, engineering investment is saved, and the environment is protected.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. The overhead soilless roadbed structure has the advantages of small foundation treatment engineering quantity, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.
2. In order to better resist the adverse effect of centrifugal force in a curve section, a transverse tie beam is connected between two adjacent pile foundations at the bottom of the same joist, and a longitudinal tie beam is connected between the corresponding pile foundations at the bottom of the adjacent joist.
3. According to the overhead soilless roadbed structure, the auxiliary structures such as the vertical walls of the cable grooves are fixed on the bearing plate, so that the auxiliary structures and the bearing plate form a whole, differential settlement of the auxiliary structures and the bearing plate is avoided, and the problem that the auxiliary structures are damaged due to uneven settlement is solved.
4. According to the overhead soilless roadbed structure, the bearing plate, the joist connected with the bearing plate and the pile foundation below the joist are connected into a whole, and drainage is led into the ground through the joist connected with the bearing plate, so that the relative displacement is small, and a drainage device can be effectively protected.
5. According to the roadbed assembly, the transverse expansion joint is matched with the sliding layer, so that when at least one overhead soilless roadbed structure is spliced in sequence along the length direction of the bearing plate, longitudinal relative dislocation and deformation between the bearing plate and the joist can be allowed, and adverse effects of temperature and shrinkage creep in the structure are reduced.
6. The roadbed system has the advantages of small foundation treatment engineering quantity, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.
7. According to the roadbed system, the waste slag filling body is arranged on the foundation and is positioned below the bearing plate, and a gap exists between the waste slag filling body and the bearing plate.
8. The construction method has the advantages of small engineering quantity of foundation treatment, small occupied area, small filling material consumption, more controllable construction quality, environmental protection and lower construction cost.
9. According to the construction method, a small amount of waste soil generated during pile foundation construction is utilized in situ to form the waste slag filling body, so that adverse effects of waste soil taking on the environment are avoided, engineering investment is saved, and the environment is protected.
Drawings
Fig. 1 is a schematic cross-sectional view of an overhead soilless roadbed structure of the present invention.
Fig. 2 is a schematic view showing the connection of the reinforcing bars of the bearing plate and joist of the present invention.
FIG. 3 is a schematic vertical section of the subgrade system of the present invention.
FIG. 4 shows a schematic A-A section of the present invention.
Icon: 1-a bearing plate; 2-joists; 3-an installation part; 4-pile foundation; 5-a transverse expansion joint; 6-sliding layer 7-track structure; 8-a protective wall; 9-cable groove vertical wall; 10-a protective railing foundation; 11-an overhaul channel; 12-a protective railing; 13-a water discharge hole; 14-a transverse drain pipe; 15-a longitudinal drain pipe; 16-a vertical drain pipe; 17-a drain pipe clamp; 18-flange; 19-pile foundation main tendons; 20-connecting reinforcing steel bars; 21. -guard wall embedded bars; 22-embedded bars of the vertical wall of the cable trough; 23-embedded bars of the railing foundation; 24-waste slag filling body; 25-foundation surface; 26-a transverse tie beam; 27-a longitudinal beam; 28-foundation; 29-contact net support foundation.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1-4, the overhead soilless roadbed structure according to the present embodiment includes a carrier plate 1, a plurality of joists 2 are arranged at the bottom of the carrier plate 1, all joists 2 are arranged at intervals along the length direction of the carrier plate 1, the joists 2 can limit the lateral displacement of the carrier plate 1, at least two pile foundations 4 are arranged at intervals along the length direction of the joists 2 at the bottom of each joist 2, wherein,
And a sliding layer 6 is arranged between the two joists 2 positioned at the outermost side and the corresponding bearing plate 1 along the length direction of the bearing plate 1, the sliding layer 6 is used for sliding the joists 2 and the bearing plate 1 relatively, and at least one joist 2 of the rest joists 2 is connected with the bearing plate 1.
In actual engineering, the joist 2 is connected with the carrier plate 1 mainly in a rigid or semi-rigid connection, wherein,
The rigid connection is as follows: the joist 2 and the bearing plate 1 do not move relatively and do not rotate relatively;
Semi-rigid connection: in the case of ensuring stability, the joist 2 and the bearing plate 1 do not move relatively, but can rotate relatively within a certain range.
The invention relates to an overhead soilless roadbed structure, which comprises a bearing plate 1, wherein a plurality of joists 2 are arranged at the bottom of the bearing plate 1 along the length direction of the bearing plate 1, the joists 2 can limit the transverse displacement of the bearing plate 1, at least two pile foundations 4 are arranged at the bottom of each joist 2 along the length direction of the joist 2 at intervals, when the overhead soilless roadbed structure is used, the lower ends of the pile foundations 4 are embedded into a foundation, only a small amount of exposed foundation surfaces are needed, the whole structure does not need any roadbed filler, and a small amount of waste soil pile foundations 4 are generated when drilling holes, thereby greatly reducing the adverse influence of waste soil on the environment, saving engineering investment, protecting the environment, simultaneously, solving the problems that the foundation treatment width of the foundation is only within the width range of a roadbed base surface, and the occupied area is wide, saving a large amount of land resources, avoiding excessive land removal, simultaneously saving the pile foundations, and simultaneously saving the engineering, and ensuring that the quality of the pile foundations 4 is easy to be in contact with the bearing plate 1 and the carrier beam 2 and the foundation 2 is not in the control and the quality of the foundation is easy to be controlled when the bearing plate is arranged on the bearing plate 1 and the foundation surface and the foundation is not in the control and the quality is not in the control and the control of the conventional foundation 1.
And the joist 2 can limit the transverse displacement of the bearing plate 1, and at least one joist 2 of the joists 2 in the middle of the lower part of the bearing plate 1 is connected with the bearing plate 1 along the length direction of the bearing plate 1 so as to ensure the stability between the bearing plate 1 and the joist 2.
Specifically, the joist 2 and the bearing plate 1 are connected into a whole through the connecting steel bars 20, so that the stress concentration of the pile foundation 4 at the bottom of the joist 2 to the bearing plate 1 can be reduced, and the stress in the bearing plate 1 is more uniform and reasonable.
Specifically, the pile foundation main tendons 19 in the pile foundation 4 extend into the reinforced concrete of the corresponding joist 2, so that the joist 2 is rigidly connected with the pile foundation 4.
Specifically, the distance between the adjacent joists 2 is 5 m-12 m.
In addition to the above, it is further preferable that flanges 18 extending upward are provided at both ends of the joist 2, and the flanges 18 are used for restricting the lateral displacement of the bearing plate 1.
The movement of the carrier plate 1 to both sides is limited by the flanges 18, so that the stability of the carrier plate 1 with respect to the joist 2 is ensured.
Specifically, the two ends of the joist 2 are provided with flanges 18 extending upwards, a placement space is arranged between the flanges 18 at the two ends of the same joist 2, the bottom of the bearing plate 1 is provided with an installation part 3, and the installation part 3 is matched with the placement space, so that the flanges 18 can limit the transverse displacement of the bearing plate 1.
A sliding layer 6 is arranged between the two joists 2 positioned at the outermost side and the corresponding bearing plate 1, so that longitudinal relative dislocation and deformation between the bearing plate 1 and the joists 2 can be allowed, and adverse effects of temperature and shrinkage creep in the structure are reduced; at least one joist 2 of the rest joists 2 is rigidly connected with the bearing plate 1, so that the relative stability between the bearing plate 1 and the joist 2 can be ensured, the special requirement of the high-speed railway roadbed is met, the stress concentration of the pile foundation 4 at the bottom of the joist 2 on the bearing plate 1 can be reduced, the stress in the bearing plate 1 is uniform and reasonable, and meanwhile, the upper load can be better transferred to the foundation 28 at the lower part.
The overhead soilless roadbed structure has the beneficial effects of small foundation treatment engineering quantity, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.
Example 2
As shown in fig. 1, the overhead soilless roadbed structure according to the present embodiment is different from embodiment 1 in that, in order to better resist the adverse effect of centrifugal force in a curve section of a high-speed railway, a transverse tie beam 26 is connected between two adjacent pile foundations 4 at the bottom of the same joist 2, and a longitudinal tie beam 27 is connected between two adjacent pile foundations 4 corresponding to the bottom of the joist 2.
Example 3
As shown in fig. 1, the overhead soilless roadbed structure according to the present embodiment is different from embodiment 1 or 2 in that, two sides of the bearing plate 1 are provided with a protection wall 8, the protection wall 8 extends towards the length direction of the bearing plate 1, so that a train can be effectively prevented from derailing and can be used as a vertical wall of a cable trough, a protection rail 12 is provided at the outer side of the protection wall 8, a maintenance channel 11 is provided between the protection rail 12 and the protection wall 8, a cable trough vertical wall 9 is provided below the maintenance channel 11, and the protection rail 12 and the cable trough vertical wall 9 are both connected with the bearing plate 1.
In the prior art, uneven settlement of auxiliary structures such as cable grooves and the like and main structures often occurs in the use process, and as a result, the auxiliary structures such as the cable grooves and the like are often damaged and the roadbed is filled with soil by accumulated water on the road surface; in addition, the construction process of roadbed filling and rolling is greatly influenced by weather change, the construction quality is not easy to control, and the problem of spoil caused by excavation of foundation is often generated during foundation treatment.
The bearing plate 1 is provided with a drain hole 13 in a penetrating manner, the bottom of the bearing plate 1 is provided with a drainage device, the drainage device is communicated with the drain hole 13, the drainage device is connected with the bearing plate 1, at least one joist 2 connected with the bearing plate 1 is connected with the drainage device, and the drain hole 13 is arranged on the inner side of the protective wall 8.
The outer side of the protective wall 8 is provided with a protective railing base 10, and the protective railing base 10 is connected with a protective railing 12 which can play a role in protecting maintenance personnel and cables; a cable groove vertical wall 9 is arranged below the overhaul channel 11, so that communication, signal and power cables can be separated, and the use requirements of the post-railway station profession can be met; the maintenance channel 11 is arranged between the protective rail 12 and the protective wall 8, the vertical wall 9 of the cable groove is positioned below the maintenance channel 11, so that the maintenance and the maintenance of the later stage of the railway can be facilitated, and the cable in the cable groove can be well protected.
Specifically, the protection wall 8, the cable trough vertical wall 9 and the protection railing foundation 10 are connected with the bearing plate 1 into a rigid whole through embedded bars in the protection wall, so that differential settlement between the auxiliary structure and the main structure can be effectively reduced, and the service life of the auxiliary structure is prolonged.
And a contact net support foundation 29 is arranged between the cable trough vertical wall 9 and the protective railing foundation 11 along the longitudinal direction at intervals of 40-100 m, and the contact net support foundation 29 and the bearing plate 1 are connected into a whole through embedded parts in the bearing plate.
On the basis of the above, in a further preferred manner, the carrying plate 1 is provided with a drain hole 13 in a penetrating manner, the bottom of the carrying plate 1 is provided with a drainage device, the drainage device is communicated with the drain hole 13, and the drain hole 13 is arranged inside the protective wall 8.
Specifically, drain holes 13 are symmetrically arranged near slab seams of the high-speed railway track structures 7 on two sides above the bearing plate 1, water above the bearing plate 1 is collected to the drain holes 13, and is guided to pile foundations 4 through longitudinal drain pipes 15, transverse drain pipes 14 and vertical drain pipes 16, and then is guided to the ground along the pile foundations 4; meanwhile, drain pipe clamps 17 are arranged on the bearing plate 1, the joist 2 and the pile foundation 4 at intervals, and the drain pipe clamps 17 fix the longitudinal drain pipe 15, the transverse drain pipe 14 and the vertical drain pipe 16 on corresponding structures.
Specifically, the drainage device comprises a longitudinal drainage pipe 15, a transverse drainage pipe 14 and a vertical drainage pipe 16, wherein the longitudinal drainage pipe 15 is arranged at the bottom of the bearing plate 1, the transverse drainage pipe 14 and the vertical drainage pipe 16 are connected to a joist 2 connected with the bearing plate 1, and the drainage pipe is fixed on a main structure due to certain vibration of the structure of a high-speed railway under the action of train dynamic load, so that the damage caused by the relative movement of the drainage pipe and the main structure can be avoided; drainage is led into the ground through the joist 2 connected with the bearing plate 1 instead of the side pile foundation, and because the bearing plate 1, the joist 2 connected with the bearing plate 1 and the pile foundation 4 below the joist 2 are connected into a whole, the relative displacement is small, the drainage device can be effectively protected, and the drainage device can be damaged due to the large relative longitudinal deformation between the joist 2 provided with the sliding layer 6 and the bearing plate 1. Therefore, the safety and durability of the drainage system can be ensured by adopting the drainage device, and the drainage device is more effective and attractive compared with scattered drainage.
The beneficial effects of this embodiment are: the auxiliary structures such as the cable trough vertical wall and the drain pipe are fixed on the corresponding overhead soilless roadbed structure, so that the auxiliary structures and the overhead soilless roadbed structure form a whole, differential settlement of the auxiliary structures and the overhead soilless roadbed structure is avoided, and the problem that the auxiliary structures are damaged due to uneven settlement is solved.
Example 4
As shown in fig. 1, the roadbed assembly according to this embodiment includes at least two overhead soilless roadbed structures according to any one of embodiments 1, 2 or 3, which are sequentially spliced along the length direction of the bearing plate 1, and a transverse expansion joint 5 is disposed between adjacent bearing plates 1.
According to the roadbed assembly, the transverse expansion joints 5 are matched with the sliding layer 6, so that when at least one overhead soilless roadbed structure is spliced in sequence along the length direction of the bearing plate 1, longitudinal relative dislocation and deformation between the bearing plate 1 and the joist 2 can be allowed, and adverse effects of temperature and shrinkage creep in the structure are reduced.
The carrier plate 1 adopts distributed steel bar connection with the joist 2 of mid portion to reduce stress concentration, and the setting of sliding layer 6 and horizontal expansion joint 5 on the joist 2 of the outermost side has reduced the temperature effect, can effectively control post-construction subsidence and can guarantee long-term stability.
Example 5
The subgrade system according to this embodiment includes the overhead soilless subgrade structure according to any one of embodiments 1,2 or 3, a foundation 28 and a track structure 7, wherein the lower end of the pile foundation 4 is embedded in the foundation 28, a gap exists between the foundation 28 and the bearing plate 1, and the track structure 7 is disposed on the top surface of the bearing plate 1.
On the basis of the above, it is further preferable that the foundation 28 is provided with a waste slag filling body 24, the waste slag filling body 24 is located below the bearing plate 1, and a gap exists between the waste slag filling body 24 and the bearing plate 1.
The small amount of waste soil generated during the construction of the roadbed system is utilized in situ, so that adverse effects of waste soil taking on the environment are avoided, engineering investment is saved, and the environment is protected.
On the basis of the above, in a further preferred mode, when a transverse tie beam 26 is connected between two adjacent pile foundations 4 at the bottom of the same joist 2, and a longitudinal tie beam 27 is connected between two adjacent pile foundations 4 at the bottom of the joist 2, the top ends of the transverse tie beam 26 and the top ends of the longitudinal tie beams 27 are all flush with the foundation surface 25, so that the whole structure is more stable and attractive.
The subgrade system of the embodiment is characterized in that the lower end of the pile foundation 4 is embedded into the foundation, the surface of the foundation is only required to be exposed in a small amount, the whole structure does not need any subgrade filler, and the production is carried out when a small amount of spoil pile foundation 4 is produced during drilling, the adverse effect of spoil on the environment is greatly reduced, engineering investment is saved, the environment is also protected, meanwhile, the treatment width of the foundation is only in the range of the width of the foundation surface because only the pile foundation 4 is connected with the foundation, the problems of wide foundation treatment width and wide occupation area of the traditional roadbed structure form of 'filling soil + foundation treatment' are solved, a large amount of land resources are saved, excessive land reclamation is avoided, engineering investment is also saved, and because of the nature of the pile foundation 4, the bearing plate 1 and the supporting beam 2 are arranged on the pile foundation 4, a gap exists between the foundation 28 and the bearing plate 1 and the bearing plate is not in contact with the foundation, and the bearing plate 1 and the supporting beam 2 can be positioned above the surface of the foundation during use, so that the construction quality is controllable, the reliability and easy to check and the maintenance and the 'filling quality of the foundation + filling quality of the traditional foundation treatment' are not controlled.
Example 6
As shown in fig. 1, a construction method of forming the roadbed system according to embodiment 5 according to the present embodiment comprises the following steps,
1. Performing simple field leveling on a natural ground, positioning pile holes, drilling to a specified depth, temporarily and intensively placing drilling waste slag in a safe area, hoisting a reinforcement cage at one time, pouring concrete below the ground of a pile foundation 4, chiseling off pile foundations with poor pile forming quality near the ground, removing floating paste and sundries on the concrete surface of a construction joint, treating the construction joint, standing a mould, pouring concrete above the ground of the pile foundation, and completing the construction of the pile foundation 4 when the strength of the pile foundation reaches more than 75% of the design strength;
2. Performing quality detection on the pile foundation 4, setting a template of the joist 2 after the pile foundation is qualified, roughening the foundation pile top, binding a reinforcement cage of the joist 2, setting a bearing plate 1 to connect with the reinforcement 20, pouring concrete on site, and removing the template when the structural strength reaches more than 75% of the design strength, so as to finish the construction of the joist 2;
3. the joist 2 is subjected to quality detection, the top surfaces of the two joists 2 positioned at the outermost sides in the length direction of the bearing plate 1 are polished to be smooth after being qualified, and a sliding layer 6 is paved to finish the construction of the sliding layer 6;
4. performing quality detection on the rest joists 2 and the sliding layer 6, setting templates of the bearing plate 1 after the joists are qualified, binding reinforcement cages in the bearing plate 1, setting protection wall embedded bars 21, cable duct vertical wall embedded bars 22, railing foundation embedded bars 23, contact net support foundation embedded parts and water discharge holes 13, pouring concrete in situ, and removing the templates when the structural strength reaches more than 75% of the design strength, so as to finish the construction of the bearing plate 1;
5. Carrying out quality detection on the bearing plate 1, arranging templates of the protective wall 8, the cable groove vertical wall 9, the protective rail foundation 10 and the contact net support foundation 29 after the templates are qualified, binding steel bars in the protective wall 8, the cable groove vertical wall 9, the protective rail foundation 10 and the contact net support foundation 29, pouring concrete in situ, and completing construction of the protective wall 8, the cable groove vertical wall 9, the protective rail foundation 10 and the contact net support foundation 29 after the structural strength reaches more than 75% of the design strength; the overhaul channel 11 is prefabricated in the field or factory and is directly placed at a corresponding position to finish construction.
6. After the construction of the overhead main body structure is completed, arranging a drain pipe clamp 17 on the bearing plate 1, the middle joist 2 and the middle pile foundation, and simultaneously constructing a longitudinal drain pipe 15, a transverse drain pipe 14 and a vertical drain pipe 16;
7. the pile foundation 4, the transverse beams 26 and the longitudinal beams 27 are evenly filled with the earth surface below the main structure to form an earth waste filling body 24, and a small amount of earth waste generated during construction is utilized in situ, so that adverse effects of earth waste taking on the environment are avoided, engineering investment is saved, and the environment is protected.
8. And after the whole construction of the high-speed railway overhead non-filling road base structure is finished, the high-speed railway track structure 7 is constructed.
In the curve section, in order to better resist the adverse effect of centrifugal force, be connected with the crossbeam 26 between two adjacent pile foundations 4 of same joist 2 bottom, adjacent joist 2 bottom corresponds be connected with between the pile foundations 4 and indulge the roof beam 27, specifically: after the underground part of the pile foundation 4 is constructed, excavating foundation pits of the transverse beams 26 and the longitudinal beams 27, chiseling pile foundations with poor pile forming quality near the ground, processing construction joints, binding reinforcement cages of the transverse beams 26 and the longitudinal beams 27, and integrally pouring concrete of the overground part of the pile foundation 4, the transverse beams 26 and the longitudinal beams 27 by a vertical mould to finish the construction of the transverse beams 26, the longitudinal beams 27 and the pile foundation 4.
The beneficial effects of this embodiment are: according to the construction method for forming the overhead soilless roadbed structure, in construction, the lower end of the pile foundation 4 is buried in the foundation, only a small amount of foundation surface is required to be exposed, any roadbed filler is not required for the whole structure, a small amount of spoil is generated, adverse effects of spoil on the environment are greatly reduced, engineering investment is saved, the environment is protected, meanwhile, the treatment width of the foundation is only in the range of the width of a roadbed surface because only the pile foundation 4 is connected with the foundation, the problems of wide foundation treatment width and wide occupation area in the traditional roadbed structure form of filling and foundation treatment are solved, a large amount of land resources are saved, excessive land reclamation is avoided, meanwhile, engineering investment is also saved, due to the nature of the pile foundation 4, the bearing plates 1 and the joists 2 on the pile foundation are arranged on the pile foundation 4, gaps exist between the foundation 28 and the bearing plates 28 and are not in contact with the foundation, and in use, the bearing plates 1 and the joists 2 can be located above the foundation surface, and construction quality is easy to control, reliable and convenient to check and maintain, and conventional filling and quality control is not solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. An overhead soilless roadbed structure which is characterized in that: comprises a bearing plate (1), wherein a plurality of joists (2) are arranged at the bottom of the bearing plate (1), all joists (2) are arranged at intervals along the length direction of the bearing plate (1), the joists (2) can limit the transverse displacement of the bearing plate (1), at least two pile foundations (4) are connected at intervals along the length direction of the joists (2) at the bottom of each joist (2), wherein,
A sliding layer (6) is arranged between two joists (2) positioned at the outermost side and the corresponding bearing plate (1) along the length direction of the bearing plate (1), the sliding layer (6) is used for sliding the joists (2) and the bearing plate (1) relatively, and at least one joist (2) in the rest joists (2) is connected with the bearing plate (1);
The novel cable groove type elevator is characterized in that protective walls (8) are arranged on two sides of the bearing plate (1), protective rails (12) are arranged on the outer sides of the protective walls (8), an overhaul channel (11) is arranged between each protective rail (12) and each protective wall (8), a cable groove vertical wall (9) is arranged below each overhaul channel (11), and each protective rail (12) and each cable groove vertical wall (9) are connected with the bearing plate (1);
The bearing plate (1) is provided with a water drain hole (13) in a penetrating manner, the bottom of the bearing plate (1) is provided with a water drain device, the water drain device is communicated with the water drain hole (13), the water drain device is connected with the bearing plate (1), at least one joist (2) connected with the bearing plate (1) is connected with the water drain device, and the water drain hole (13) is arranged at the inner side of the protective wall (8);
The drainage device comprises a longitudinal drainage pipe (15), a transverse drainage pipe (14) and a vertical drainage pipe (16), wherein the longitudinal drainage pipe (15) is arranged at the bottom of the bearing plate (1), and the transverse drainage pipe (14) and the vertical drainage pipe (16) are connected to a joist (2) connected with the bearing plate (1).
2. An overhead soilless roadbed structure according to claim 1, wherein a transverse tie beam (26) is connected between two adjacent pile foundations (4) at the bottom of the same joist (2), and a longitudinal tie beam (27) is connected between the corresponding pile foundations (4) at the bottom of the adjacent joist (2).
3. The subgrade assembly is characterized by comprising at least two overhead soilless subgrade structures as claimed in any one of claims 1-2 spliced in sequence along the length direction of the bearing plate (1), and a transverse expansion joint (5) is arranged between adjacent bearing plates (1).
4. A subgrade system adopting the overhead soilless subgrade structure as claimed in any of claims 1-2, characterized by comprising a foundation (28) and a track structure (7), wherein the lower end of the pile foundation (4) is embedded into the foundation (28), a gap exists between the foundation (28) and the bearing plate (1), and the track structure (7) is arranged on the top surface of the bearing plate (1).
5. A subgrade system as claimed in claim 4, characterized in that said foundation surface (25) is provided with a waste slag filling body (24), said waste slag filling body (24) being located below said carrier plate (1), a gap being present between said waste slag filling body (24) and said carrier plate (1).
6. A subgrade system as claimed in claim 4 or 5, wherein when a transverse tie beam (26) is connected between two adjacent pile foundations (4) at the bottom of the same joist (2), and a longitudinal tie beam (27) is connected between the adjacent pile foundations (4) at the bottom of the joist (2), the top ends of said transverse tie beam (26) and the top ends of said longitudinal tie beam (27) are both flush with the foundation surface (25).
7. A construction method for forming the roadbed system according to any one of claims 4 to 6, comprising the steps of:
S1: -performing said pile foundation (4) construction on a foundation (28), and said pile foundation (4) top portion emerging from said foundation (28);
s2: the construction of the joists (2) is carried out on the top of the pile foundation (4), the construction of the sliding layer (6) is carried out on the tops of the two joists (2) which are positioned on the outermost side along the length direction of the bearing plate (1), the construction of the connecting reinforcing steel bars (20) is carried out on at least one joist (2) of the rest joists (2), and the connecting reinforcing steel bars (20) extend out
The top of the joist (2);
S3: and carrying out construction on the bearing plate (1), wherein the connecting steel bars (20) are connected with a steel bar cage in the bearing plate (1).
8. The construction method according to claim 7, wherein when a transverse beam (26) is connected between two adjacent pile foundations (4) at the bottom of the same joist (2), and a longitudinal beam (27) is connected between two adjacent pile foundations (4) at the bottom of the joist (2), the step S1 specifically comprises:
S11: excavating a foundation pit of the pile foundation (4), and constructing an underground part of the pile foundation (4);
S12: excavating foundation pits of the transverse tie beams (26) and the longitudinal tie beams (27), and binding reinforcement cages of the transverse tie beams (26) and reinforcement cages of the longitudinal tie beams (27);
S13: and (3) integrally pouring concrete of the overground part of the pile foundation (4), the transverse tie beam (26) and the longitudinal tie beam (27), and completing construction of the transverse tie beam (26), the longitudinal tie beam (27) and the pile foundation (4).
9. The construction method of an overhead soilless roadbed structure according to any one of claims 7 or 8, wherein the construction of the waste slag filling body (24) is further performed after the step S3: uniformly filling the drilled waste slag of the pile foundation (4) on the foundation surface (25) below the bearing plate (1) to form a waste slag filling body (24), and enabling a gap to exist between the waste slag filling body (24) and the bearing plate (1).
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