CN111270570A - Overhead soilless roadbed structure, roadbed assembly, roadbed system and construction method - Google Patents

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 joists, a sliding layer is arranged between two joists positioned on the outermost side and the corresponding bearing plate along the length direction of the bearing plate, the sliding layer is used for relative sliding between the joists and the bearing plate, and at least one of the remaining joists is rigidly connected with the bearing plate. The overhead soilless roadbed structure has the advantages of small foundation treatment engineering amount, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.

Description

Overhead soilless roadbed structure, roadbed assembly, roadbed system and construction method

Technical Field

The invention belongs to the field of geotechnical engineering, and particularly relates to an overhead soilless roadbed structure, a roadbed component, a roadbed system and a construction method.

Background

The high-speed railway has extremely high requirements on the post-construction settlement of the roadbed, and in order to control the post-construction settlement and meet the requirements on the safe operation and the comfort level of a high-speed railway, the conventional railway roadbed usually adopts very strong foundation treatment measures, particularly for filling roadbed sections. The mode of controlling the post-construction settlement of the railway subgrade is adopted in the high-speed railway subgrade filling section, the two sides of the high-speed railway subgrade filling section are inclined to the ground, and the foundation treatment is carried out on the ground, such as 'embedded joist pile plate structure' (CN103397656A), 'four-line ballastless track subgrade pile plate structure' (CN204644799U), 'a construction method for reinforcing and treating the newly-built railway karst foundation and the subgrade structure thereof' (CN105696427A), and 'prefabricated GFRP pipe concrete pile and concrete slab overhead subgrade pile plate structure' (CN 108824097A).

The roadbed structure form of 'filling and foundation treatment' has the advantages of small post-construction settlement and high operation comfort, and is a roadbed structure form commonly used at home and abroad. However, in the structural form, as the occupied land width and the filling load are increased after filling, the area of foundation treatment is directly increased and the treatment depth is deep, so that greater engineering investment is caused; the structure form needs a large amount of qualified fillers, the fillers are difficult to source and the price is increased continuously due to the problems of environmental protection, transportation distance and the like, and the problem is particularly prominent in the plain areas of the middle east; the land occupation width of the structure is several times of the road surface width, the land acquisition and removal amount is large, and the investment is high, particularly for urban areas and cultivated land sections.

Therefore, an environment-friendly and economic high-speed railway roadbed structure form with small foundation treatment engineering amount, small occupied area, small filling material consumption and more controllable construction quality is urgently needed to replace the existing roadbed structure form of 'filling and foundation treatment'.

Disclosure of Invention

The invention aims to: the overhead soilless roadbed structure, the roadbed component, the roadbed system and the construction method are provided, aiming at the problems that the roadbed structure form of 'filling and foundation treatment' in the prior art has large foundation treatment area, the occupied land width is several times of the roadbed surface width, a large amount of roadbed fillers are needed, and the construction cost is high.

In order to achieve the purpose, the invention adopts the technical scheme that:

an overhead soilless roadbed structure comprises a bearing plate, wherein a plurality of joists are arranged at the bottom of the bearing plate, all the 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 the bottom of each joist along the length direction of the joists at intervals, wherein,

and in the length direction of the bearing plate, a sliding layer is arranged between two joists positioned on the outermost side and the corresponding bearing plate, the sliding layer is used for the relative sliding between the joists and the bearing plate, and at least one of the remaining joists is connected with the bearing plate.

The invention relates to an overhead soilless roadbed structure, which comprises a bearing plate, wherein 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 joists, when the structure is used, the lower ends of the pile foundations are buried in a foundation, only a small amount of the pile foundations are exposed out of the surface of the foundation, the whole structure does not need any roadbed filling material, and a small amount of waste soil (generated when the pile foundations are drilled) is generated, so that the adverse effect of the waste soil on the environment is greatly reduced, the engineering investment is saved, the environment is protected, meanwhile, the treatment width of the foundation is only in the width range of the base surface, and the problems of wide occupied area of the conventional roadbed structure of 'filling and foundation treatment' are solved, the bearing plate and the joist are both positioned above the surface of the foundation when in use, so that the construction quality is controllable and reliable, the inspection and the maintenance are convenient, and the problem that the traditional filling construction quality of 'filling and foundation treatment' is not easy to control is solved.

The joist can limit the lateral displacement of the bearing plate, and at least one joist in the middle of the lower part of the bearing plate is connected with the bearing plate along the length direction of the bearing plate to ensure the stability between the bearing plate and the joist,

two joists that are located the outside and corresponding be provided with the sliding layer between the loading board, can allow like this to take place vertical relative dislocation and deformation between loading board and the joists, remain in the joists at least one the joists with the loading board is connected, can guarantee the relative stability between loading board and the joists, makes it can satisfy the special requirement of high-speed railway roadbed, thereby guarantees this application overhead soilless roadbed structure safety and stability, can reduce the pile foundation of this joists bottom again simultaneously and concentrate to the stress of loading board for the atress in the loading board is according to even, reasonable, simultaneously, can transmit upper portion load to the ground of lower part better.

In conclusion, the overhead soilless roadbed structure has the advantages of small foundation treatment engineering amount, small occupied area, small filler consumption, controllable construction quality, environmental friendliness and lower construction cost.

Preferably, the two adjacent pile foundations at the bottom of the same joist are connected with a transverse tie beam, and the bottoms of the adjacent joists correspond to the longitudinal tie beams connected between the pile foundations.

In a curve section, in order to better resist the adverse effect 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 bottom of the adjacent joist and the pile foundations;

preferably, flanges extending upwards are arranged at two ends of the joist, and the flanges are used for limiting the lateral displacement of the bearing plate.

The flange limits the lateral movement of the bearing plate to two sides, so that the bearing plate is ensured to be laterally stable relative to the joist.

In the prior art, the roadbed structure form of 'filling and foundation treatment' adopts filling construction, so that uneven settlement of auxiliary structures such as cable troughs and the like and a main structure often occurs in the use process, and as a result, the auxiliary structures such as the cable troughs and the like are damaged and water accumulated 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 a plurality of soil abandonment problems are often generated due to excavation of foundations during construction foundation treatment.

Preferably, protective walls are arranged on two sides of the bearing plate, protective railings are arranged on the outer sides of the protective walls, an overhaul channel is arranged between each protective railing and each protective wall, a cable trough vertical wall is arranged below each overhaul channel, and the protective railings and the cable trough vertical walls are connected with the bearing plate;

the bearing plate is provided with a water drainage hole in a penetrating mode, the bottom of the bearing plate is provided with a water drainage device, the water drainage device is communicated with the water drainage hole, the water drainage device is connected with the bearing plate, at least one joist connected with the bearing plate is connected with the water drainage device, and the water drainage hole is formed in the inner side of the protective wall.

The bearing board both sides are provided with the protecting wall, can effectively prevent the train derail.

The structure of the high-speed railway can vibrate greatly under the action of dynamic load of the train, and the drain pipe is fixed on the main body structure, so that the drain pipe and the main body structure can be prevented from being damaged due to relative movement;

the bearing plate, the joist connected with the bearing plate and the pile foundation below the joist are connected into a whole, so that drainage is introduced 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 can be damaged due to large relative longitudinal deformation 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 (the drain hole and the drainage device) of the overhead soilless roadbed structure, and is more effective and more 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 professional use requirements after a railway station are met; the guard rail with be provided with the access way between the protective wall, the cable duct erects the wall and is located access way 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 auxiliary structures and the bearing plate form a whole, the phenomenon that the auxiliary structures and the bearing plate are differentially settled 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 bearing plate both sides are provided with the protecting wall, be provided with the cable duct on the protecting wall, the protecting wall can effectively prevent the train derail and can regard as the vertical wall use of cable duct.

The invention also discloses a roadbed component which comprises at least two overhead soilless roadbed structures sequentially spliced along the length direction of the bearing plates, wherein a transverse expansion joint is arranged between every two adjacent bearing plates.

According to the roadbed component, the transverse expansion joints are matched with the sliding layer, so that when at least one overhead soilless roadbed structure is sequentially spliced along the length direction of the bearing plate, the bearing plate and the joist can be allowed to longitudinally and relatively dislocated and deformed, and the 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 embedded into the foundation, a gap is formed between the foundation and the bearing plate, and the track structure is arranged on the top surface of the bearing plate.

When the roadbed system is used, the lower end of the pile foundation is buried in the foundation, only a small amount of soil is exposed out of the surface of the foundation, the whole structure does not need any roadbed filling, and a small amount of soil abandon (generated when the pile foundation is drilled) is generated, so that the adverse effect of the soil abandon on the environment is greatly reduced, the engineering investment is saved, the environment is protected, meanwhile, because only the pile foundation is connected with the foundation, the treatment width of the foundation is only in the width range of a roadbed surface, the problems of wide treatment width and wide occupied area of the foundation in the traditional roadbed structure of 'soil filling + foundation treatment' are solved, a large amount of land resources are saved, excessive land acquisition and removal are avoided, the engineering investment is also saved, because the pile foundation is characterized in that the bearing plate and the joist are arranged on the pile foundation, a gap exists between the foundation and the bearing plate, the foundation is not in contact with the foundation, when the roadbed, the bearing plate and the joist can be positioned above the surface of the foundation, so the construction quality is controllable and reliable, the inspection and the maintenance are convenient, and the problem that the filling construction quality of the traditional 'filling and foundation treatment' is not easy to control is solved.

Preferably, a waste slag filling body is arranged on the foundation and located below the bearing plate, and a gap is formed between the waste slag filling body and the bearing plate.

By utilizing a small amount of waste soil generated in the construction of the roadbed system in situ, the adverse effect of waste soil on the environment is avoided, the engineering investment is saved, the environment is protected, and meanwhile, the waste slag filling body reinforces the pile foundation, so that the overhead soilless roadbed structure is more stable.

Preferably, as same adjacent two in joist bottom be connected with horizontal tie beam between the pile foundation, it is adjacent the joist bottom corresponds when being connected with the vertical tie beam between the pile foundation, horizontal tie beam top with the vertical tie beam top all flushes with the ground surface for whole structure is more stable and pleasing to the eye.

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 out of the foundation;

s2: the joist construction is carried out on the top of the pile foundation, the sliding layer construction is carried out on the tops of two joists which are positioned on the outermost side in the length direction of the bearing plate, and the construction of connecting steel bars is carried out on at least one of the remaining joists, wherein the connecting steel bars extend out of the tops of the joists, and a gap is formed between the bearing plate and the foundation;

s3: and carrying out the construction of the bearing plate, wherein the connecting steel bars are connected with the steel bar cage in the bearing plate.

The construction method for forming the roadbed system has the advantages that during construction, the lower end of the pile foundation is buried in the foundation, only a small amount of roadbed filling is needed, a small amount of waste soil is generated (generated during pile foundation drilling), the adverse effect of the waste soil on the environment is greatly reduced, the engineering investment is saved, the environment is protected, meanwhile, because only the pile foundation is connected with the foundation, the treatment width of the foundation is only within the width range of a roadbed surface, the problems of wide treatment width and wide occupied area of the conventional roadbed structure of 'filling and foundation treatment' are solved, a large amount of land resources are saved, excessive land acquisition and removal are avoided, the engineering investment is also saved, and because of the properties, the bearing plate and the joist on the bearing plate are arranged on the pile foundation, and a gap exists between the foundation and the bearing plate, the bearing plate and the joist can be positioned above the surface of the foundation when the bearing plate and the joist are used, so that the construction quality is controllable and reliable, the inspection and the maintenance are convenient, and the problem that the filling construction quality of the traditional 'filling and foundation treatment' is not easy to control is solved.

Preferably, when the two adjacent pile foundations at the bottom of the joist are connected with a transverse tie beam, the bottom of the joist corresponds to the longitudinal tie beam connected between the pile foundations, the step S1 specifically includes:

s11: excavating a pile foundation pit, and carrying out construction on the underground part of the pile foundation;

s12: excavating the transverse tie beam and the longitudinal tie beam foundation pit, and binding the transverse tie beam reinforcement cage and the longitudinal tie beam reinforcement cage;

s13: and integrally pouring concrete of the overground part of the pile foundation, the transverse tie beams and the longitudinal tie beams to finish the construction of the transverse tie beams, the longitudinal tie beams and the pile foundation.

Preferably, the step S3 is followed by construction of waste slag filling:

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, and enabling a gap to exist between the waste slag filling body and the bearing plate.

A 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, the engineering investment is saved, and the environment is protected.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the overhead soilless roadbed structure has the advantages of small foundation treatment engineering amount, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.

2. In the overhead soilless roadbed structure, in a curve section, in order to better resist the adverse effect 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 bottom of the adjacent joist corresponding to the pile foundations.

3. According to the overhead soilless roadbed structure, the cable groove vertical walls and other auxiliary structures are fixed on the bearing plate, so that the auxiliary structures and the bearing plate form a whole, differential settlement between the auxiliary structures and the bearing plate is avoided, and the problem of damage of the auxiliary structures caused by non-uniform 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, drainage is introduced into the ground through the joist connected with the bearing plate, the relative displacement is small, and a drainage device can be effectively protected.

5. According to the roadbed component, the transverse expansion joints are matched with the sliding layer, so that when at least one overhead soilless roadbed structure is sequentially spliced along the length direction of the bearing plate, the bearing plate and the joist can be allowed to longitudinally and relatively dislocated and deformed, and the 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 abandoned slag filling body is arranged on the foundation and is positioned below the bearing plate, a gap exists between the abandoned slag filling body and the bearing plate, and a small amount of abandoned soil generated in the roadbed system construction process is utilized in situ, so that adverse effects of abandoned soil on the environment are avoided, the engineering investment is saved, and the environment is protected.

8. The construction method 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.

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, the engineering investment is saved, and the environment is protected.

Drawings

Fig. 1 is a schematic cross-sectional view of the overhead soilless subgrade structure of the invention.

FIG. 2 is a schematic view showing the connection of reinforcing bars between a bearing plate and a joist according to the present invention.

Fig. 3 is a schematic longitudinal section of the roadbed system according to the invention.

FIG. 4 is a schematic cross-sectional view A-A of the present invention.

Icon: 1-a carrier plate; 2-a joist; 3-an installation part; 4-pile foundation; 5-transverse expansion joint; 6-sliding layer 7-track structure; 8, a protective wall; 9-vertical wall of cable trough; 10-protective railing foundation; 11-maintenance channel; 12-protective railing; 13-a weep hole; 14-a transverse drain pipe; 15-longitudinal drainage pipe; 16-vertical drain pipes; 17-a drain pipe clamp; 18-a flange; 19-pile foundation main reinforcement; 20-connecting reinforcing steel bars; 21, embedding steel bars in the protective wall; 22-embedding steel bars in a vertical wall of the cable trough; 23, embedding steel bars in a railing foundation; 24-discarding the slag filling body; 25-ground surface; 26-a transverse tie beam; 27-longitudinal tie beam; 28-foundation; 29-contact net support foundation.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

As shown in fig. 1-4, the overhead soilless roadbed structure of the embodiment comprises a bearing plate 1, wherein a plurality of joists 2 are arranged at the bottom of the bearing plate 1, all the joists 2 are arranged at intervals along the length direction of the bearing plate 1, the joists 2 can limit the lateral displacement of the bearing plate 1, at least two pile foundations 4 are arranged at the bottom of each joists 2 at intervals along the length direction of the joists 2, wherein,

in the length direction of the bearing plate 1, a sliding layer 6 is arranged between two joists 2 located at the outermost side and the corresponding bearing plate 1, the sliding layer 6 is used for relative sliding between the joists 2 and the bearing plate 1, and at least one of the joists 2 in the rest joists 2 is connected with the bearing plate 1.

In practical engineering, the connection form of the joist 2 and the bearing plate 1 is mainly rigid connection or semi-rigid connection, wherein,

the rigid connection is as follows: the joist 2 and the bearing plate 1 do not move relatively and rotate relatively;

semi-rigid connection: under the condition that the stability can be ensured, 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 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 arranged at the bottom of each joists 2 at intervals along the length direction of the joists 2, when the structure is used, the lower ends of the pile foundations 4 are embedded into a foundation, only a small amount of the pile foundations are exposed out of the surface of the foundation, the whole structure does not need any roadbed filling material, and a small amount of spoiled pile foundations 4 are drilled, so that the adverse effect of spoil on the environment is greatly reduced, the engineering investment is saved, the environment is protected, and meanwhile, as only the pile foundations 4 are connected with the foundation, the treatment width of the foundation is only in the width range of the roadbed, and the problem that the foundation treatment width in the traditional, The problem of occupying a large amount of land resources has been practiced thrift, excessive land acquisition removal has been avoided, the engineering investment has also been practiced thrift simultaneously, because pile foundation 4 nature, and loading board 1 and joist 2 on it all set up on pile foundation 4, it does not contact with the ground, when using, loading board 1 and joist 2 all can be located the ground surface above, so construction quality is controllable, reliable and be convenient for inspect and maintain, the difficult problem of control of traditional "fill soil + foundation treatment" filling construction quality has been solved.

The joist 2 can limit the lateral displacement of the bearing plate 1, and at least one joist 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, connect into whole through connecting reinforcement 20 between joist 2 and the loading board 1, can reduce the stress concentration of pile foundation 4 to loading board 1 of this joist 2 bottom for the atress in the loading board 1 is more even, reasonable.

In particular, the pile foundation studs 19 in the pile foundation 4 extend into the reinforced concrete of the corresponding joist 2 so as to rigidly connect the joist 2 to the pile foundation 4.

Specifically, the distance between the adjacent joists 2 is 5-12 m.

On the basis, in a further preferable mode, flanges 18 extending upwards are arranged at two ends of the joist 2, and the flanges 18 are used for limiting the lateral displacement of the bearing plate 1.

The movement of the carrier plate 1 to both sides is limited by the flanges 18, thus ensuring that the carrier plate 1 is stable relative to the joists 2.

Specifically, 2 both ends of joist are provided with the edge of a wing 18 that extends towards the top, and 2 both ends of same joist be provided with between the edge of a wing 18 and place the space, loading board 1 bottom is provided with installation department 3, installation department 3 with place the space and cooperate, make edge of a wing 18 can restrict 1 lateral displacement of loading board.

A sliding layer 6 is arranged between the two joists 2 positioned at the outermost side and the corresponding bearing plate 1, so that the bearing plate 1 and the joists 2 can be allowed to longitudinally and relatively dislocated and deformed, and the adverse effects of temperature and shrinkage creep in the structure are reduced; at least one joist 2 in the rest of the joists 2 is rigidly connected with the bearing plate 1, so that the relative stability between the bearing plate 1 and the joists 2 can be ensured, the special requirements of the high-speed railway roadbed are met, the stress concentration of the pile foundation 4 at the bottom of the joists 2 on the bearing plate 1 can be reduced, the stress in the bearing plate 1 is uniform and reasonable, and simultaneously, the upper load can be better transmitted to the foundation 28 at the lower part.

The invention has the beneficial effects that the overhead soilless roadbed structure has small foundation treatment engineering amount, small occupied area, small filler consumption, more controllable construction quality, environmental protection and lower construction cost.

Example 2

As shown in fig. 1, the difference between the overhead soilless roadbed structure of this embodiment and embodiment 1 is that, in a curved section of a high-speed railway, in order to better resist the adverse effect of centrifugal force, 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 bottom of the adjacent joist 2 corresponding to the pile foundations 4.

Example 3

As shown in fig. 1, the difference between the overhead soilless roadbed structure of this embodiment and embodiment 1 or 2 lies in that, bearing board 1 both sides are provided with protective wall 8, protective wall 8 orientation bearing board 1 length direction extends, can effectively prevent the train derailment and can regard as the perpendicular wall use of cable duct, protective wall 8's the outside is provided with guard rail 12, guard rail 12 with be provided with maintenance passageway 11 between the protective wall 8, maintenance passageway 11 below is provided with cable duct perpendicular wall 9, guard rail 12 with cable duct perpendicular wall 9 all with bearing board 1 is connected.

In the prior art, uneven settlement of auxiliary structures such as cable troughs and the like and main structures often occurs in the use process, so that the auxiliary structures such as the cable troughs and the like are damaged, and accumulated water on a roadbed surface infiltrates 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 a plurality of soil abandonment problems are often generated due to excavation of foundations during construction foundation treatment.

The bearing plate 1 is provided with a water drainage hole 13 in a penetrating mode, the bottom of the bearing plate 1 is provided with a water drainage device, the water drainage device is communicated with the water drainage hole 13, the water drainage device is connected with the bearing plate 1, at least one joist 2 connected with the bearing plate 1 is connected with the water drainage device, and the water drainage hole 13 is formed in the inner side of the protective wall 8.

A protective barrier foundation 10 is arranged on the outer side of the protective wall 8, and a protective barrier 12 is connected to the protective barrier foundation 10, so that the protective barrier can protect maintainers 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 professional use requirements after a railway station are met; guard rail 12 with be provided with between the protective wall 8 and overhaul channel 11, the cable duct erects wall 9 and is located overhaul channel 11 below, can make things convenient for the maintenance and the maintenance in railway later stage to protect the cable in the cable duct well.

Specifically, the protective wall 8, the cable duct vertical wall 9 and the protective railing foundation 10 are connected with the bearing plate 1 through the embedded steel bars in the protective wall and the cable duct vertical wall to form a rigid whole, so that the difference settlement between the auxiliary structure and the main structure can be effectively reduced, and the service life of the auxiliary structure is prolonged.

Set up contact net support basis 29 along longitudinal direction interval 40 ~ 100m between cable duct vertical wall 9 and protection railing basis 11, contact net support basis 29 and loading board 1 connect into whole through the built-in fitting in the loading board.

On the basis, in a further preferable mode, a drainage hole 13 is formed in the carrying plate 1 in a penetrating manner, a drainage device is arranged at the bottom of the carrying plate 1, the drainage device is communicated with the drainage hole 13, and the drainage hole 13 is formed in the inner side of the protective wall 8.

Specifically, drain holes 13 are symmetrically arranged near slab joints 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 the pile foundation 4 through a longitudinal drain pipe 15, a transverse drain pipe 14 and a vertical drain pipe 16 and then guided to the ground along the pile foundation 4; simultaneously on loading board 1, joist 2 and pile foundation 4 the interval set up drain pipe strap 17, and drain pipe strap 17 all fixes vertical drain pipe 15, horizontal drain pipe 14 and vertical drain pipe 16 on corresponding structure.

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 the main structure due to certain vibration of the structure of the high-speed railway under the action of dynamic load of a train, so that the damage caused by the relative motion of the drainage pipe and the main structure can be avoided; drainage is introduced into the ground through the joist 2 connected with the bearing plate 1 instead of introducing the side pile base into the ground, 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 by large relative longitudinal deformation between the joist 2 provided with the sliding layer 6 and the bearing plate 1. Therefore, the drainage device can ensure the safety and durability of a drainage system, and is more effective and more attractive compared with scattered drainage.

The beneficial effects of this embodiment: the cable duct vertical wall and other accessory structures and the drain pipe are fixed on the corresponding overhead soilless roadbed structure, so that the cable duct vertical wall and other accessory structures and the drain pipe form a whole with the overhead soilless roadbed structure, differential settlement between the accessory structures and the overhead soilless roadbed structure is avoided, and the problem of accessory structure damage caused by uneven settlement is solved.

Example 4

As shown in fig. 1, the roadbed component according to this embodiment includes at least two overhead soilless roadbed structures as in any one of embodiments 1, 2 or 3, which are sequentially spliced along the length direction of the bearing plates 1, and a transverse expansion joint 5 is provided between adjacent bearing plates 1.

The roadbed component comprises a transverse expansion joint 5 and a sliding layer 6, wherein the transverse expansion joint 5 is matched with the sliding layer 6, so that when at least one overhead soilless roadbed structure is sequentially spliced along the length direction of a bearing plate 1, longitudinal relative dislocation and deformation between the bearing plate 1 and a joist 2 can be allowed, and adverse effects of temperature and shrinkage creep in the structure are reduced.

The bearing plate 1 and the joist 2 in the middle part are connected by adopting distributed steel bars, so that stress concentration is reduced, the temperature effect is reduced by arranging the sliding layer 6 and the transverse expansion joint 5 on the joist 2 at the outermost side, the post-construction settlement can be effectively controlled, and the long-term stability can be ensured.

Example 5

The roadbed system comprises the overhead soilless roadbed structure as in any one of the embodiments 1, 2 or 3, and further comprises 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 is formed 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.

On the basis, in a further preferable mode, the foundation 28 is provided with a waste slag filling body 24, the waste slag filling body 24 is located below the carrying plate 1, and a gap exists between the waste slag filling body 24 and the carrying plate 1.

By utilizing a small amount of spoil generated during the construction of the roadbed system, the in-situ utilization is carried out, so that the adverse influence of spoil taking on the environment is avoided, the engineering investment is saved, and the environment is protected.

On the basis, further preferred mode, it is same be same 2 adjacent two in joist the bottom be connected with horizontal tie beam 26 between the pile foundation 4, adjacent 2 bottoms of joist correspond when being connected with vertical tie beam 27 between the pile foundation 4, horizontal tie beam 26 top with vertical tie beam 27 top all flushes with ground surface 25 for whole structure is more stable, and pleasing to the eye.

In the roadbed system, when the roadbed system is used, the lower end of the pile foundation 4 is buried in the foundation, only a small amount of roadbed filling is required to be exposed out of the surface of the foundation, the whole structure does not need any roadbed filling, and a small amount of abandoned soil pile foundation 4 is generated when drilling, so that the adverse effect of abandoned soil on the environment is greatly reduced, the engineering investment is saved, the environment is protected, meanwhile, because only the pile foundation 4 is connected with the foundation, the treatment width of the foundation is only within the width range of a roadbed surface, the problems of wide foundation treatment width and wide occupied area in the traditional roadbed structure form of 'filling and foundation treatment' are solved, a large amount of land resources are saved, excessive land acquisition and removal are avoided, the engineering investment is also saved, because the pile foundation 4 is in nature, the bearing plate 1 and the joist 2 on the pile foundation are both arranged on the pile foundation 4, and a gap exists between the foundation 28 and the bearing plate 1, and the, when the bearing plate is used, the bearing plate 1 and the joist 2 can be positioned above the surface of the foundation, so that the construction quality is controllable and reliable, the inspection and the maintenance are convenient, and the problem that the filling construction quality of the traditional 'filling and foundation treatment' is difficult to control is solved.

Example 6

As shown in fig. 1, the construction method for forming the roadbed system according to the embodiment 5 includes the following steps,

1. simply flattening the natural ground, positioning pile holes, drilling to a specified depth, temporarily and intensively placing drilling waste residues in a safe area, hoisting a reinforcement cage at one time, pouring concrete of the part below the ground of a pile foundation 4, chiseling the pile foundation with poor pile forming quality near the ground, removing floating slurry and sundries on the surface of construction joint concrete, treating the construction joint, pouring concrete above the ground part of the pile foundation through a vertical formwork, and removing the formwork when the strength of the pile foundation reaches over 75 percent of the designed strength to finish the construction of the pile foundation 4;

2. detecting the quality of the pile foundation 4, arranging a template of the joist 2 after the pile foundation is qualified, chiseling the foundation pile top, binding a reinforcement cage of the joist 2, arranging a bearing plate 1 to connect with the reinforcement 20, casting concrete on site, and removing the template when the structural strength reaches more than 75% of the design strength to complete the construction of the joist 2;

3. carrying out quality detection on the joists 2, polishing the top surfaces of the two joists 2 which are positioned on the outermost side in the length direction of the bearing plate 1 to be smooth after the quality detection is qualified, and paving a sliding layer 6 to finish the construction of the sliding layer 6;

4. performing quality detection on the rest of joists 2 and the sliding layer 6, setting a template of the bearing plate 1 after the quality detection is qualified, binding a reinforcement cage in the bearing plate 1, setting a protective wall embedded reinforcement 21, a cable duct vertical wall embedded reinforcement 22, a railing foundation embedded reinforcement 23, a contact net support foundation embedded part and a drain hole 15, pouring concrete on site, and removing the template when the structural strength reaches over 75% of the design strength to complete 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 trough vertical wall 9, the protective railing foundation 10 and the contact net support foundation 29 after the bearing plate is qualified, binding reinforcing steel bars in the protective wall 8, the cable trough vertical wall 9, the protective railing foundation 10 and the contact net support foundation 29, pouring concrete in situ, and removing the templates when the structural strength reaches over 75% of the design strength to complete the construction of the protective wall 8, the cable trough vertical wall 9, the protective railing foundation 10 and the contact net support foundation 29; the access passage 11 is prefabricated on site or in a factory and can be directly placed at a corresponding position to complete construction.

6. After the construction of the overhead main structure is finished, 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 excavated waste slag of the pile foundation 4, the transverse tie beams 26 and the longitudinal tie beams 27 is uniformly filled on the ground surface below the main body structure to form a waste slag filling body 24, a small amount of waste soil generated during construction is utilized in situ, the adverse effect of the excavated waste soil on the environment is avoided, the engineering investment is saved, and the environment is protected.

8. And after the whole construction of the high-speed railway overhead type non-fill roadbed structure is finished, constructing the high-speed railway track structure 7.

In the curved section, in order to better resist the adverse effect of centrifugal force, it is same 2 adjacent two in the joist bottom be connected with horizontal tie beam 26 between the pile foundation 4, adjacent 2 bottoms of joist correspond be connected with vertical tie beam 27 between the pile foundation 4, specifically do: after the underground part of the pile foundation 4 is constructed, foundation pits of the transverse tie beams 26 and the longitudinal tie beams 27 are excavated, the pile foundation with poor pile forming quality near the ground is chiseled, construction joints are processed, reinforcement cages of the transverse tie beams 26 and the longitudinal tie beams 27 are bound, concrete of the overground part of the pile foundation 4, the transverse tie beams 26 and the longitudinal tie beams 27 is integrally poured at one time through a vertical die, and the construction of the transverse tie beams 26, the longitudinal tie beams 27 and the pile foundation 4 is completed.

The beneficial effect of this embodiment does: the construction method for forming the overhead soilless roadbed structure has the advantages that during construction, the lower end of a pile foundation 4 is buried in a foundation, only a small amount of roadbed filling is needed, a small amount of spoil is generated, the adverse effect of the spoil on the environment is greatly reduced, the engineering investment is saved, the environment is protected, meanwhile, only the pile foundation 4 is connected with the foundation, the treatment width of the foundation is only within the width range of a roadbed surface, the problems of wide treatment width and wide occupied area of the conventional roadbed structure of 'filling and foundation treatment' are solved, a large amount of land resources are saved, excessive land acquisition and removal are avoided, the engineering investment is also saved, due to the nature of 4, a bearing plate 1 and a joist 2 on the bearing plate are arranged on the pile foundation 4, and a gap exists between the foundation 28 and the bearing plate 1, it does not contact the foundation 28, and when using, loading board 1 and joist 2 all can be located above the foundation surface, so construction quality is controllable, reliable and be convenient for inspect and maintain, has solved the not easily controllable problem of traditional "fill soil + foundation treatment" filling construction quality.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An overhead soilless roadbed structure is characterized in that: comprises a bearing plate (1), a plurality of joists (2) are arranged at the bottom of the bearing plate (1), all the 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 the bottom of each joists (2) at intervals along the length direction of the joists (2), wherein,

in the length direction of the bearing plate (1), a sliding layer (6) is arranged between two joists (2) located on the outermost side and the corresponding bearing plate (1), the sliding layer (6) is used for relative sliding between the joists (2) and the bearing plate (1), and at least one of the joists (2) in the rest joists (2) is connected with the bearing plate (1).

2. An overhead soilless roadbed structure according to claim 1, characterized in that 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 bottom of the joist (2) corresponding to the pile foundations (4).

3. An overhead soilless roadbed structure according to claim 1, characterized in that two sides of the bearing plate (1) are provided with guard walls (8), the outer side of the guard wall (8) is provided with a guard rail (12), an access passage (11) is arranged between the guard rail (12) and the guard wall (8), a cable trough vertical wall (9) is arranged below the access passage (11), and the guard rail (12) and the cable trough vertical wall (9) are both connected with the bearing plate (1);

the bearing plate (1) is provided with a water drainage hole (13) in a penetrating mode, the bottom of the bearing plate (1) is provided with a water drainage device, the water drainage device is communicated with the water drainage hole (13), the water drainage device is connected with the bearing plate (1), at least one supporting beam (2) connected with the bearing plate (1) is connected with the water drainage device, and the water drainage hole (13) is formed in the inner side of the protective wall (8).

4. Roadbed assembly, characterized in that it comprises at least two elevated soilless roadbed structures according to any of claims 1-3, which are spliced in sequence along the length direction of the bearing plates (1), and that between adjacent bearing plates (1) there are provided transverse expansion joints (5).

5. A roadbed system adopting the overhead soilless roadbed structure as claimed in any one of claims 1-3, characterized in that it comprises a foundation (28) and a track structure (7), the lower end of the pile foundation (4) is embedded in the foundation (28), a gap is formed 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).

6. A roadbed system according to claim 5, characterized in that the foundation surface (25) is provided with a spoil filling (24), which spoil filling (24) is located below the bearing plate (1), there being a gap between the spoil filling (24) and the bearing plate (1).

7. A foundation system according to claim 5 or 6, characterized in that 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 same joist (2), the top ends of the transverse tie beam (26) and the longitudinal tie beam (27) are flush with the foundation surface (25).

8. A construction method for forming a foundation system according to any of the claims 5-7, characterized in that it comprises the following steps:

s1: carrying out the pile foundation (4) construction on a foundation (28), and enabling the top of the pile foundation (4) to emerge out of the foundation (28);

s2: the joist (2) construction is carried out on the top of the pile foundation (4), the sliding layer (6) construction is carried out on the tops of two joists (2) located on the outermost side in the length direction of the bearing plate (1), connecting steel bars (20) construction are carried out on at least one of the remaining joists (2), and the connecting steel bars (20) extend out of the tops of the joists (2);

s3: and (3) carrying out construction of the bearing plate (1), and connecting steel bars (20) are connected with a steel bar cage in the bearing plate (1).

9. The construction method according to claim 8, 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 bottom of the adjacent joist (2) corresponding to the pile foundations (4), the step S1 is specifically:

s11: excavating a foundation pit of the pile foundation (4) and carrying out underground part construction on the pile foundation (4);

s12: excavating foundation pits of the transverse tie beam (26) and the longitudinal tie beam (27), and binding a reinforcement cage of the transverse tie beam (26) and a reinforcement cage of the longitudinal tie beam (27);

s13: and integrally pouring concrete of the overground part of the pile foundation (4), the transverse tie beam (26) and the longitudinal tie beam (27) to finish the construction of the transverse tie beam (26), the longitudinal tie beam (27) and the pile foundation (4).

10. A method for constructing an overhead soilless subgrade structure according to any one of claims 8 or 9, characterized in that, after step S3, a waste slag filling body (24) is constructed: and uniformly filling the drilling waste slag of the pile foundation (4) on the foundation surface (25) below the bearing plate (1) to form the 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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