CN115418985B - Reinforced structure of transition section of expansive soil road culvert of high-speed railway and construction method thereof - Google Patents
Reinforced structure of transition section of expansive soil road culvert of high-speed railway and construction method thereof Download PDFInfo
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- 230000007704 transition Effects 0.000 title claims abstract description 122
- 239000002689 soil Substances 0.000 title claims abstract description 116
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 230000002787 reinforcement Effects 0.000 claims abstract description 63
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 238000004873 anchoring Methods 0.000 claims description 26
- 238000013461 design Methods 0.000 claims description 25
- 239000004567 concrete Substances 0.000 claims description 23
- 239000004575 stone Substances 0.000 claims description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 10
- 239000011178 precast concrete Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 7
- 239000011496 polyurethane foam Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000009471 action Effects 0.000 abstract description 7
- 238000007654 immersion Methods 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 description 13
- 230000003044 adaptive effect Effects 0.000 description 6
- 230000003993 interaction Effects 0.000 description 6
- 238000002791 soaking Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/56—Screw piles
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Abstract
The invention discloses a high-speed railway expanded soil road culvert transition section reinforcing structure and a construction method thereof, and relates to the technical field of geotechnical engineering expanded soil road culvert transition section reinforcing treatment; the reinforced structure comprises a box-type culvert structure, a foundation bed layer, an expansive soil foundation, a differential deformation self-adaptive structure layer, a geogrid reinforcement layer, a spiral pile, an inverted trapezoid transition structure and an upper grid layer. The reinforcing structure can regulate and control longitudinal differential expansion deformation generated by the high-speed railway expansion soil road culvert transition section under the action of water immersion and longitudinal differential settlement deformation generated by the high-speed railway expansion soil culvert transition section under the action of water loss, ensure that the longitudinal differential expansion deformation, the longitudinal differential settlement deformation and the longitudinal change rate of the expansion soil culvert transition section are controlled within the standard requirements, and further ensure the stability of the longitudinal deformation and the service safety of the road culvert transition section in the expansion soil area. The construction method can ensure the smooth change of the longitudinal deformation of the road culvert transition section in the expansive soil region, and effectively ensure the operation safety of the high-speed train.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a high-speed railway expansive soil road culvert transition section reinforcing structure and a construction method thereof.
Background
In the transition section of the high-speed railway road culvert, because of the rigidity difference between the roadbed structure and the culvert structure, the power and deformation characteristics of the railway roadbed are often changed drastically along the longitudinal direction of the railway, thereby affecting the running safety of the high-speed train. In order to solve the problem of huge rigidity variation difference between a culvert transition Duan Zhonglu base structure and a culvert structure, the currently proposed disposal measure is to arrange a triangle or trapezoid structure between the culvert structure and a roadbed structure and to adopt improved fillers for filling, so that the longitudinal rigidity of a line can be slowly changed to promote the smoothness of an upper track structure, and then the smooth running of a high-speed train is ensured.
However, in the expansive soil region, expansive soil has the characteristics of remarkable water-swelling deformation and water-loss shrinkage deformation, and has repeatability with climate change. In the road culvert transition section, rigidity difference exists between the roadbed structure and the culvert structure, and meanwhile, dead weight loads of the roadbed structure and the culvert structure are different, so that obvious differential expansion deformation and differential settlement deformation can be generated between the roadbed structure and the culvert structure in an expansion soil area, and therefore longitudinal differential deformation and longitudinal change rate of the road culvert transition section in the expansion soil area are obvious, and longitudinal smoothness of an upper track structure is seriously affected. The existing treatment measures of the road culvert transition section are mainly used for adjusting the longitudinal rigidity difference of the road culvert transition section, but the problems of longitudinal difference deformation and longitudinal change rate of the expanded soil road culvert transition section are ignored, so that the existing treatment measures cannot solve the actual problems faced by the expanded soil road culvert transition section.
Therefore, a new reinforcement structure for the expansion soil road culvert transition section of the high-speed railway and a construction method thereof are urgently needed to be designed, so that the problem of longitudinal differential deformation control of the expansion soil road culvert transition section is solved.
Disclosure of Invention
The invention aims to provide a reinforcing structure for an expansive soil road culvert transition section of a high-speed railway, which aims to solve the problems of obvious longitudinal differential expansion deformation and longitudinal differential settlement deformation of the expansive soil road culvert transition section provided in the background art, and ensure that the longitudinal differential deformation and the longitudinal change rate control of the expansive soil road culvert transition section meet the standard requirements.
The invention provides a reinforcement structure for an expansion soil road culvert transition section of a high-speed railway, which comprises a box-type culvert structure, a foundation bed layer, an expansion soil foundation, a differential deformation self-adaptive structure layer, a geogrid reinforcement layer, a spiral pile, an inverted trapezoid transition structure and an upper grid layer; the geogrid reinforcement layer is arranged on the top surface of the expansive soil foundation, the box-type culvert structure is arranged on the top surface of the geogrid reinforcement layer, a plurality of spiral piles are arranged, the spiral piles penetrate through the bottom plate of the box-type culvert structure and the geogrid reinforcement layer, the top ends of the spiral piles are anchored in preset anchoring holes on the bottom plate of the box-type culvert structure, and the bottom ends of the spiral piles extend into a stable region of the expansive soil foundation; the foundation bed layer is arranged on the top surface of the expansive soil foundation, and the inverted trapezoid transition structure is arranged on the top surface of the geogrid reinforcement layer and is positioned between the box culvert structure and the foundation bed layer and the expansive soil foundation; the differential deformation self-adaptive structure layers are arranged in multiple layers, the multiple layers of the differential deformation self-adaptive structure layers are vertically paved in the inverted trapezoid transition structure in parallel, one ends of the multiple layers of the differential deformation self-adaptive structure layers are connected with the box-type culvert structure, and the other ends of the multiple layers of the differential deformation self-adaptive structure layers extend into the foundation bed layer from the inverted trapezoid transition structure; the upper grid layer is paved above the box-type culvert structure, and the paving length of the upper grid layer extends to at least 2m outside the inverted trapezoid transition structure.
Further, the box culvert structure is a reinforced concrete structure, the longitudinal cross section of the box culvert structure is a rectangular cavity, and two sides on a bottom plate of the box culvert structure are respectively provided with a row of preset anchoring holes; the preset anchor holes are arranged in a downward recessed manner from the upper surface of the bottom plate of the box culvert structure, and the recessed depth of the preset anchor holes is not more than half of the thickness of the bottom plate of the box culvert structure.
Further, a plurality of twisted steel bar pieces which are arranged in a transverse and vertical matrix form are arranged on the outer surfaces of the two side walls of the box culvert structure, and hooks are arranged at one ends of the twisted steel bar pieces; one end of the twisted steel piece without the hook stretches into the corresponding side wall of the box culvert structure and is welded with the steel bar on the inner side of the side wall, and the other end of the twisted steel piece with the hook is exposed out of the corresponding side wall of the box culvert structure.
Further, the twisted steel member is made of hot rolled ribbed steel bars with diameters not smaller than 18 mm; the hooks are semicircular, and the radius of the hooks is 8 cm-15 cm; the distance between the exposed end points of the twisted steel pieces and the outer surfaces of the corresponding side walls of the box culvert structure is 10 cm-20 cm.
Further, the differential deformation self-adaptive structure layer comprises a plurality of limiting telescopic structures and a geogrid layer, wherein each limiting telescopic structure comprises a spring structure with hooks at two ends and an elastic corrugated pipe, the spring structure is arranged in a cavity of the elastic corrugated pipe, and polyurethane foam is filled in the cavity; the hooks at one end of the limiting telescopic structure are respectively connected with one end of the geogrid layer at the same elevation, and the other end of the geogrid layer extends into the foundation bed layer.
Further, the differential deformation self-adaptive structural layer is connected with the deformed steel bar piece on the side wall of the box culvert structure through a plurality of hooks at the other end of the limiting telescopic structure arranged in the differential deformation self-adaptive structural layer; the natural length of the elastic corrugated pipe is 1-3 m, the maximum telescopic amplitude of the elastic corrugated pipe is 50cm, and the two ends of the elastic corrugated pipe are provided with precast concrete cover blocks for plugging.
Further, the geogrid reinforcement layer comprises an upper gravel layer and a lower sand layer, and one geogrid layer is arranged in each of the gravel layer and the sand layer.
Further, the spiral pile is formed by pouring reinforced concrete in situ, the cross section of the spiral pile is circular, and the pile wall of the spiral pile is provided with a thread-shaped convex rib; main reinforcing steel bars in the spiral pile penetrate through the preset anchoring holes and the whole spiral pile from top to bottom, and the top ends of the main reinforcing steel bars are bent along the radial direction of the preset anchoring holes.
Furthermore, the inverted trapezoid transition structure is formed by filling graded broken stone doped with cement with the mass fraction of 2% -3%; the side face of the inverted trapezoid transition structure is in contact with the foundation bed layer and the expansive soil foundation to form an inclined interface, and the inclined slope ratio of the interface is 1:2-1:5.
The invention also provides a construction method of the high-speed railway expansion soil road culvert transition section reinforcing structure, which comprises the following steps:
S1: according to the expansion characteristics and mechanical characteristics of the expansion soil of the construction site of the transition section, determining the design size, design parameters and arrangement form of each structural component, and manufacturing a reinforcement cage, a threaded reinforcement piece, a limiting telescopic structure and a hook; meanwhile, manufacturing a precast concrete cover block, and curing until the concrete design strength is reached;
S2: cleaning a construction site to meet construction operation requirements, excavating an expansive soil foundation to a design elevation to form a transition section structure, and leveling the site; carrying out paying-off work according to the design layout, drilling pile holes for pouring spiral piles by adopting a long spiral drilling machine according to the mode of extending the central line of the expansive soil foundation to two sides, placing reinforcement cages into the drilled pile holes, and pouring concrete to finally form the spiral piles; cutting off pile heads of redundant parts of the pile tops of the spiral piles according to the elevation of the pile tops after curing to the design strength of the concrete, and reserving main reinforcing steel bars;
s3: paving a geogrid reinforcement layer on the top surface of the expansive soil foundation;
S4: firstly, installing a template and binding reinforcing steel bars on the top surface of the geogrid reinforcement layer according to the design size and the reinforcement distribution requirement; simultaneously installing and welding a twisted steel member according to a designed position, and reserving a preset anchoring hole at the pile top position of the spiral pile; then, pouring concrete and continuously curing until the concrete is designed to be strong, and removing the template to form a box-type culvert structure;
S5: bending main reinforcing steel bars extending from the pile tops of the spiral piles along the radial direction of the preset anchoring holes, then pouring concrete with the same grade strength as the box culvert structure into the preset anchoring holes, and curing until the concrete reaches the design strength;
s6: firstly assembling a limiting telescopic structure, then filling polyurethane foam into a cavity of an elastic corrugated pipe, and plugging two ends of the elastic corrugated pipe by adopting a precast concrete cover block; secondly, filling graded broken stone with mass fraction of 2% -3% on two sides of the box culvert structure in a layered manner, compacting the graded broken stone, installing and paving a differential deformation self-adaptive structural layer at a position corresponding to a designed elevation in time, and synchronously filling and compacting a foundation bed layer in a layered manner, wherein the differential deformation self-adaptive structural layer is connected with a threaded steel bar piece on the side wall of the box culvert structure through a hook, and finally an inverted trapezoid transition structure is formed;
s7: and paving two geogrids on the top surfaces of the box-type culvert structure and the inverted trapezoid transition structure in a layered manner to form an upper grid layer.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the reinforcement structure for the transition section of the expansion soil road culvert of the high-speed railway, the box culvert structure is fixed on the top surface of the expansion soil foundation through the spiral piles, the spiral pile bodies are fixed in the expansion soil foundation through the interface interaction of the spiral piles and the soil body of the expansion soil foundation, the pile lengths of the spiral piles extend into the stable area of the expansion soil foundation, and the spiral piles cannot generate (soaking) expansion deformation and (water loss) sedimentation deformation due to the interface interaction in the stable area, so that the box culvert structure cannot generate expansion deformation and sedimentation deformation; the screw thread-shaped convex ribs on the surface of the screw pile can play a role in increasing the friction force of pile soil interface, further ensure the reliability of the screw pile in no expansion deformation and no sedimentation deformation, and simultaneously help to shorten the pile length of the screw pile and reduce the construction cost and construction difficulty; the elastic elongation generated by the limiting telescopic structure in the differential deformation self-adaptive structural layer increases the longitudinal change width of the differential expansion deformation and the differential settlement deformation between the box culvert structure and the inverted trapezoid transition structure, so that the change gradient of the differential expansion deformation and the differential settlement deformation along the longitudinal direction is reduced, and the change rate of the longitudinal differential deformation is reduced; the reverse trapezoid transition structure can transfer expansion deformation and settlement deformation of the reverse trapezoid transition structure to the box culvert structure through the differential deformation self-adaptive structure layer, and then the reverse trapezoid transition structure is transferred to the spiral pile anchored on the bottom plate of the reverse trapezoid transition structure through the box culvert structure, and is restrained by interface interaction between the spiral pile and an expansion soil foundation soil body, so that the expansion deformation and settlement deformation of the reverse trapezoid transition structure are reduced. Meanwhile, the differential deformation self-adaptive structural layer paved in the inverted trapezoid transition structure can regulate and control and reduce differential change rates of expansion deformation and sedimentation deformation in the inverted trapezoid transition structure along the longitudinal direction of the road base, and the expansion deformation and the sedimentation deformation between the inverted trapezoid transition structure and the foundation bed layer can form coordination and continuity through the geogrid layer, so that the differential deformation self-adaptive structural layer is beneficial to reducing the longitudinal differential expansion deformation and differential sedimentation deformation of the expanded soil road culvert transition section and the longitudinal change rate thereof. The upper grid layer laid on the top of the box culvert structure and the geogrid reinforcement layer laid on the bottom of the box culvert structure are capable of further regulating and controlling the expansion deformation and sedimentation deformation among the box culvert structure, the inverted trapezoid transition structure and the foundation bed layer through the longitudinal deformation capacity of the geogrid reinforcement layer, so that the longitudinal differential expansion deformation (sedimentation deformation) of the expansion soil culvert transition section under the action of soaking (water loss) and the longitudinal change rate of the expansion soil culvert transition section are reduced. Therefore, the reinforcing structure can regulate and control longitudinal differential expansion deformation of the expansion soil road culvert transition section of the high-speed railway under the action of water immersion and longitudinal differential settlement deformation of the expansion soil road culvert transition section under the action of water loss, ensure that the longitudinal differential expansion deformation, the longitudinal differential settlement deformation and the longitudinal change rate of the expansion soil road culvert transition section are controlled within the standard requirements, and further ensure the stability of the longitudinal deformation and the service safety of the road culvert transition section of the expansion soil region.
(2) The construction method is suitable for an expansive soil road culvert transition section with obvious longitudinal differential expansion deformation and longitudinal differential settlement deformation, specifically adopts in-situ pouring of a spiral pile, lays a geogrid reinforcement layer on the top surface of an expansive soil foundation, and pours the top surface of the geogrid reinforcement layer to form a box culvert structure, bends main reinforcements on the pile top of the spiral pile along the radial direction of a preset anchoring hole, so that the spiral pile fixes the box culvert structure on the top surface of the expansive soil foundation, then fills and compacts graded broken stone with the mass fraction of 2% -3% cement on two sides of the box culvert structure, timely installs and lays a differential deformation self-adaptive structure layer at a corresponding design elevation position, and synchronously fills and compacts a foundation layer in a layered manner, and the differential deformation self-adaptive structure layer is connected with hooks of screw reinforcement pieces on the side wall of the box culvert structure through hooks to form an inverted trapezoid transition structure; and finally, paving two geogrids on the top surfaces of the box-type culvert structure and the inverted trapezoid transition structure in a layered manner to form an upper grid layer. By adopting the reinforcing structure of the construction method, the longitudinal differential expansion deformation and the longitudinal differential settlement deformation of the expansion soil road culvert transition section of the high-speed railway can be regulated and controlled, so that the longitudinal differential deformation and the longitudinal change rate of the expansion soil road culvert transition section are reduced, the smooth change of the longitudinal deformation of the expansion soil road culvert transition section is ensured, and the running safety of the high-speed train is ensured.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic view of a longitudinal cross-section of a preferred embodiment of a high-speed railway expanded soil culvert transition section reinforcing structure (only half of the longitudinal cross-section of the reinforcing structure is shown);
FIG. 2 is a schematic diagram of a box culvert structure according to one embodiment of the invention;
FIG. 3 is a schematic structural view of a screw pile according to one embodiment;
FIG. 4 is a schematic structural view of a differential deformation adaptive structural layer according to one embodiment of the present invention;
FIG. 5 is a schematic view of the structure of a geogrid reinforcement layer according to one embodiment of the present invention;
Wherein, 1-box culvert structure; 1.1-presetting an anchor hole; 1.2-rebar pieces; a 2-bed; 3-expanding the soil foundation; 4-a differential deformation adaptive structural layer; 4.1-a limiting telescopic structure; 4.11-hooking; 4.12-spring structure; 4.13-elastic bellows; 4.14-polyurethane foam; 4.15-prefabricating concrete cover blocks; 4.2-geogrid layers; 5-a geogrid reinforcement layer; 5.1-geogrid; 5.2-a crushed stone layer; 5.3-a sand layer; 6-spiral piles; 6.1-ribs; 6.2-main reinforcement; 7-an inverted trapezoid transition structure; 8-upper grid layer.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
Referring to fig. 1 to 5, the present embodiment provides a reinforcement structure for an expansion soil culvert transition section of a high-speed railway, which comprises a box-type culvert structure 1, a foundation bed layer 2, an expansion soil foundation 3, a differential deformation adaptive structural layer 4, a geogrid reinforcement layer 5, a screw pile 6, an inverted trapezoid transition structure 7 and an upper grid layer 8; the specific structure is as follows:
The geogrid reinforcement layer 5 is arranged on the top surface of the expansive soil foundation 3, and the box-type culvert structure 1 is arranged on the top surface of the geogrid reinforcement layer 5; the spiral piles 6 are arranged in a plurality, and the spiral piles 6 penetrate through the bottom plate of the box-type culvert structure 1 and the geogrid reinforcement layer 5; the top ends of the spiral piles 6 are anchored in preset anchoring holes 1.1 on the bottom plate of the box-type culvert structure 1, and the bottom ends of the spiral piles 6 extend into a stable area of the expansive soil foundation 3; the foundation bed layer 2 is arranged on the top surface of the expansive soil foundation 3, and the inverted trapezoid transition structure 7 is arranged on the top surface of the geogrid reinforcement layer 5 and is positioned between the box culvert structure 1 and the foundation bed layer 2 and the expansive soil foundation 3; the differential deformation self-adaptive structural layers 4 are arranged in a plurality, the differential deformation self-adaptive structural layers 4 are paved (layered) in the inverted trapezoid transition structure 7 at intervals in an up-down parallel manner, one ends of the differential deformation self-adaptive structural layers 4 are connected with the box-type culvert structure 1, and the other ends extend into the foundation bed layer 2 from the inverted trapezoid transition structure 7; it should be noted that, a plurality of differential deformation adaptive structural layers 4 are respectively disposed on two sides of the box-type culvert structure, and the differential deformation adaptive structural layers on two sides are symmetrically disposed. The upper grating layer 8 is paved above the box-type culvert structure 1 and the inverted trapezoid transition structure 7, and both ends of the paving length of the upper grating layer 8 extend to at least 2m outside the inverted trapezoid transition structure on the corresponding side. In the structural arrangement, the stable region of the expansive soil foundation refers to a region where the expansive soil foundation does not generate expansion and contraction deformation under the environmental influence factors such as temperature, evaporation, rainfall, groundwater level fluctuation and the like, and the depth of the region can be determined by combining local hydrogeologic observation data, if no related data exists, the depth can also be determined according to related specifications/standards.
In the preferred embodiment of the invention, the box culvert structure 1 is a reinforced concrete structure, the longitudinal cross section of the box culvert structure 1 is a rectangular cavity, a row of preset anchoring holes 1.1 are respectively arranged on the bottom plate of the box culvert structure 1 and on two sides of the box culvert structure 1 in the width direction, and each row of preset anchoring holes 1.1 comprises a plurality of preset anchoring holes 1.1 which are uniformly arranged at intervals along the length direction of the box culvert structure 1; the preset anchoring holes 1.1 are arranged in a downward concave manner from the upper surface of the bottom plate of the box culvert structure 1, the preset anchoring holes 11 are round holes with diameters of 0.3 m-0.6 m, and the concave depth of the preset anchoring holes 1.1 is not more than half of the thickness of the bottom plate of the box culvert structure 1. The structure enables the spiral pile to effectively fix the box-type culvert structure, and meanwhile, main reinforcing steel bars at the pile top of the spiral pile cannot leak outwards to influence the attractiveness.
In the preferred embodiment of the present invention, the outer surfaces of the two side walls of the box culvert structure 1 are respectively provided with a plurality of twisted steel members 1.2 arranged in a matrix form along the transverse direction and the vertical direction, and it is understood that the transverse direction of the box culvert structure 1 is the length direction of the box culvert structure 1, and the vertical direction of the box culvert structure 1 is the height direction along the box body. One end of the screw-thread steel bar 1.2 is provided with a semicircular arc-shaped hook; the screw thread steel bar 1.2 is made of hot rolled ribbed steel bars with the diameter not smaller than 18mm, and the radius of the hook is 8 cm-15 cm. One end of the twisted steel member 1.2 without the hook extends into the corresponding side wall of the box culvert structure 1 and is welded with the steel bars on the inner side of the side wall, and the other end of the twisted steel member 1.2 with the hook is exposed out of the corresponding side wall of the box culvert structure 1; specifically, the distance between the end point of the exposed end (hook) of the twisted steel 1.2 and the outer surface of the corresponding side wall of the box culvert structure 1 is 10 cm-20 cm.
In the preferred embodiment of the invention, each differential deformation self-adaptive structural layer 4 comprises a plurality of limiting telescopic structures 4.1 and a geogrid layer 4.2, each limiting telescopic structure 4.1 comprises a spring structure 4.12 and elastic corrugated pipes 4.13, two ends of each spring structure 4.12 are respectively provided with a hook 4.11, each spring structure 4.12 is arranged in a cavity of the corresponding elastic corrugated pipe 4.13, and the inside of the cavity of each elastic corrugated pipe is filled with polyurethane foam 4.14. Each differential deformation self-adaptive structural layer 4 is connected with the box culvert structure 1 through a plurality of limiting telescopic structures 4.1 arranged in the differential deformation self-adaptive structural layer, specifically, hooks 4.11 at one end of each limiting telescopic structure 4.1 are respectively connected with a plurality of threaded steel bar pieces 1.2 in the same horizontal row on the side wall of the box culvert structure 1, hooks 4.11 at the other end of each limiting telescopic structure 4.1 are respectively connected with one end of a geogrid layer 4.2 at the same elevation, and the other end of the geogrid layer 4.2 extends into a foundation bed layer 2, and the length in the foundation bed layer 2 is not less than 2m. The natural length of the elastic corrugated pipe 4.12 is 1 m-3 m, the maximum telescopic amplitude of the elastic corrugated pipe is 50cm, and both ends of the elastic corrugated pipe 4.12 are plugged by adopting precast concrete cover blocks 4.15. Preferably, the number of the limiting telescopic structures 4.1 arranged in each differential deformation self-adaptive structural layer 4 is the same as the number of columns of the deformed steel bar pieces 1.2 arranged in a matrix form, the number of the differential deformation self-adaptive structural layers 4 is the same as the number of rows of the deformed steel bar pieces 1.2 arranged in a matrix form, and each differential deformation self-adaptive structural layer can be well connected with the box culvert structure 1 through the arrangement, so that the soil body reinforcing effect of a reinforcing area is improved.
In the preferred embodiment of the invention, the limiting telescopic structure 4.1 in the differential deformation adaptive structure layer 4 has the functions of elasticity and flexibility, and can generate telescopic deformation in any angle direction so as to adapt and adjust differential expansion deformation or sedimentation deformation between the box culvert structure 1.1 and the inverted trapezoid transition structure 7, thereby reducing longitudinal differential deformation and longitudinal change rate between the box culvert structure 1.1 and the inverted trapezoid transition structure 7. The geogrid layer 4.2 in the differential deformation self-adaptive structural layer 4 adjusts the expansion deformation or sedimentation deformation of the inverted trapezoid transition structure 7 and the longitudinal change rate thereof through the self-flexible function, and simultaneously, the longitudinal differential deformation and the longitudinal change rate thereof between the inverted trapezoid transition structure 7 and the foundation bed 2 are reduced through connecting the inverted trapezoid transition structure 7 and the foundation bed 2. Therefore, the differential deformation self-adaptive structural layer 4 can regulate and control and reduce the longitudinal differential deformation and the longitudinal change rate thereof among the box culvert structure 1, the inverted trapezoid transition structure 7 and the foundation bed layer 2, and promote the longitudinal deformation smoothness thereof.
In the preferred embodiment of the present invention, the geogrid reinforcement layer 5 comprises an upper crushed stone layer 5.2 and a lower sand layer 5.3, and one geogrid 5.1 is arranged in each of the crushed stone layer 5.2 and the sand layer 5.3. In this structural arrangement, the crushed stone layer 5.2 in the geogrid reinforcement layer 5 is intermeshed with the geogrid 5.1 placed therein, forming a good integral structure. The sand stone layer 5.3 has excellent fluidity, and can increase the flexible deflection performance of the geogrid reinforcement layer 5, thereby adjusting the uneven deformation of the expansive soil foundation 3 and reducing the influence of the uneven deformation of the expansive soil foundation 3 on the longitudinal differential deformation of the transition section.
In the preferred embodiment of the invention, the screw pile 6 is formed by pouring reinforced concrete in situ, the cross section of the screw pile 6 is circular, and the radius is 20 cm-40 cm; the pile wall of the spiral pile 6 is provided with screw thread-shaped ribs 6.1, the ribs 6.1 protrude from the pile wall surface by 6 cm-12 cm, and the distance between adjacent ribs 6.1 along the pile length direction is 20 cm-50 cm. The main steel bar 6.2 in the screw pile 6 penetrates through the preset anchoring hole 1.1 and the whole screw pile 6 from top to bottom, the top end of the main steel bar 6.2 is bent along the radial direction of the preset anchoring hole 1.1, and the main steel bar 6.2 of the bent part is positioned in the preset anchoring hole 1.1. In this structure setting, main reinforcing bar is arranged along spiral stake whole length, and main reinforcing bar extends the pile bolck simultaneously, runs through and predetermines the anchor hole, again along predetermineeing anchor Kong Shewan. The spiral ribs 6.1 are arranged on the surface of the spiral pile 6, so that the interfacial friction between pile soil can be obviously increased, further, the expansion deformation and sedimentation deformation of the expansion soil foundation 3 between piles can be effectively restrained, and meanwhile, the expansion soil foundation 3 also forms effective anchoring for the spiral pile 6. Therefore, the vertical deformation of both the screw piles 6 and the expansive soil foundation 3 is reduced, and the vertical deformation of the box culvert structure 1 disposed above is also reduced.
In the preferred embodiment of the invention, the inverted trapezoid transition structure 7 is filled by graded broken stone doped with 2-3% of cement by mass fraction; the side surface of the inverted trapezoid transition structure 7 is in contact with the foundation bed layer 2 and the expansive soil foundation 3 to form an inclined interface, and the inclination slope ratio of the interface is 1:2-1:5.
The embodiment of the invention also provides a construction method of the high-speed railway expansion soil road culvert transition section reinforcing structure, which comprises the following steps:
S1: according to the expansion characteristics and mechanical characteristics of the expansion soil of the construction site of the transition section, determining the design size, design parameters and arrangement form of each structural component, and manufacturing reinforcement processing operations such as reinforcement cages, threaded reinforcement members 1.2, limiting telescopic structures 4.1 and hooks 4.11; meanwhile, manufacturing a precast concrete cover block 4.15, and curing until the concrete has the designed strength;
S2: cleaning a construction site to meet construction operation requirements, excavating an expansive soil foundation 3 to a design elevation to form a transition section structure, and leveling the site; carrying out paying-off work according to the design layout, drilling pile holes for pouring the spiral piles 6 by adopting a long spiral drilling machine which meets the design parameter requirements of the pile body in a mode of extending from the central line of the expansive soil foundation 3 to two sides, placing a reinforcement cage into the drilled pile holes, and pouring concrete to finally form the spiral piles 6; after curing to the concrete design strength, cutting off the pile head of the redundant part of the pile top of the spiral pile 6 according to the elevation of the pile top, and reserving the main reinforcing steel bars 6.2;
S3: paving a geogrid reinforcement layer 5 on the top surface of the expansive soil foundation 3;
S4: firstly, installing a template and binding reinforcing steel bars on the top surface of a geogrid reinforcement layer 5 according to the design size and the reinforcement distribution requirement; simultaneously installing and welding a twisted steel member 1.2 according to a designed position, and reserving a preset anchoring hole 1.1 at the pile top position of the screw pile 6; then, pouring concrete and continuously curing until the concrete is designed to be strong, and removing the template to form the box-type culvert structure 1;
S5: bending main steel bars 6.2 extending from the pile tops of the spiral piles 6 along the radial direction of the preset anchoring holes 1.1, then pouring concrete with the same level strength as that of the box culvert structure 1 into the preset anchoring holes 1.1, and curing until the concrete reaches the design strength;
S6: firstly, assembling a limiting telescopic structure 4.1, then filling polyurethane foam 4.14 into a cavity of an elastic corrugated pipe 4.13, and plugging two ends of the elastic corrugated pipe 4.13 by adopting a precast concrete cover block 4.15; secondly, filling and compacting graded broken stone doped with cement with mass fraction of 2% -3% on two sides of the box culvert structure 1 in a layered manner, timely installing and paving a differential deformation self-adaptive structural layer 4 at a position corresponding to a designed elevation, and synchronously filling and compacting a foundation bed layer 2 in a layered manner, wherein the differential deformation self-adaptive structural layer 4 is connected with a threaded steel bar piece 1.2 on the side wall of the box culvert structure 1 through a hook 4.11, and finally forms an inverted trapezoid transition structure 7;
S7: two geogrids are layered on the top surfaces of the box-type culvert structure 1 and the inverted trapezoid transition structure 7 to form an upper grid layer 8; and finally, the construction of the reinforced structure of the transition section of the expansive soil road culvert of the high-speed railway is completed.
In the embodiment of the invention, under the action of soaking (water loss), the expansive soil absorbs water to expand (shrink), so that the expansive soil foundation 3 is expanded and deformed (subsided and deformed). The box culvert structure 1 is secured to the top surface of the expansive soil foundation 3 by helical piles 6 anchored to its bottom plate. At the same time, the interface interaction of the spiral pile 6 and the soil body of the expansive soil foundation 3 fixes the pile body of the spiral pile 6 in the expansive soil foundation. Since the pile length of the helical pile 6 extends into the stable region of the expansive soil foundation 3, the interface interaction in the stable region causes no expansion deformation (sedimentation deformation) of the helical pile 6, and thus causes no expansion deformation (sedimentation deformation) of the box culvert structure 1. In addition, the screw thread-shaped convex ribs 6.1 on the pile surface of the screw pile 6 can increase the pile-soil interface friction effect, further ensure the reliability of no expansion deformation (expansion deformation) of the screw pile 6, and simultaneously help to shorten the pile length of the screw pile 6 and reduce the engineering cost and construction difficulty. The limiting telescopic structure 4.1 in the differential deformation self-adaptive structural layer 4 generates elastic elongation in an oblique upward direction (oblique downward direction), so that the longitudinal change width of differential expansion deformation (differential settlement deformation) between the box culvert structure 1 and the inverted trapezoid transition structure 7 is increased, further, the change gradient of the differential expansion deformation (differential settlement deformation) along the longitudinal direction is reduced, and the change rate of the longitudinal differential expansion deformation (differential settlement deformation) is reduced. In addition, the reverse trapezoid transition structure 7 can transmit expansion deformation (settlement deformation) of the reverse trapezoid transition structure to the box culvert structure 1 through the differential deformation self-adaptive structural layer 4, and then the reverse trapezoid transition structure is transmitted to the spiral pile 6 anchored on the bottom plate of the reverse trapezoid transition structure through the box culvert structure 1, and is further restrained by interface interaction between the spiral pile 6 and the soil body of the expansion soil foundation 3, so that the expansion deformation (settlement deformation) of the reverse trapezoid transition structure 7 is reduced. Meanwhile, the differential deformation self-adaptive structural layer 4 paved in the inverted trapezoid transition structure 7 can regulate and control and reduce the differential change rate of the expansion deformation (differential settlement deformation) in the inverted trapezoid transition structure 7 along the longitudinal direction of the road base, and the expansion deformation (differential settlement deformation) between the inverted trapezoid transition structure 7 and the foundation bed layer 2 can form coordination and continuity through the geogrid layer 4.2, so that the differential deformation self-adaptive structural layer is beneficial to reducing the longitudinal differential expansion deformation (longitudinal differential settlement deformation) and the longitudinal change rate of the expansion soil culvert transition section. The upper grid layer 8 laid on the top of the box culvert structure 1 and the geogrid reinforcement layer 5 laid on the bottom of the box culvert structure 1 further regulate and control the expansion deformation among the box culvert structure 1, the inverted trapezoid transition structure 7 and the foundation bed layer 2 through the longitudinal deformation capacity of the geogrid reinforcement layer, so that the longitudinal differential expansion deformation (longitudinal differential settlement deformation) of the expansion soil culvert transition section under the action of soaking (water loss) and the longitudinal change rate of the expansion soil culvert transition section are reduced. Therefore, the invention can regulate and control the longitudinal differential expansion deformation and longitudinal differential settlement deformation of the expansion soil road culvert transition section of the high-speed railway, thereby reducing the longitudinal differential deformation and the longitudinal change rate of the expansion soil road culvert transition section, and further ensuring the longitudinal deformation stability and the service safety of the road culvert transition section in the expansion soil area.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-speed railway expansion soil road culvert transition section reinforcing structure is characterized by comprising a box-type culvert structure (1), a foundation bed layer (2), an expansion soil foundation (3), a differential deformation self-adaptive structure layer (4), a geogrid reinforcement layer (5), a spiral pile (6), an inverted trapezoid transition structure (7) and an upper grid layer (8); the geogrid reinforcement layer (5) is arranged on the top surface of the expansive soil foundation (3), the box-type culvert structure (1) is arranged on the top surface of the geogrid reinforcement layer (5), the spiral piles (6) are arranged in a plurality, the spiral piles (6) penetrate through the bottom plate of the box-type culvert structure (1) and the geogrid reinforcement layer (5), the top ends of the spiral piles (6) are anchored in preset anchor holes (1.1) on the bottom plate of the box-type culvert structure (1), and the bottom ends of the spiral piles (6) extend into a stable region of the expansive soil foundation (3); the foundation bed layer (2) is arranged on the top surface of the expansive soil foundation (3), and the inverted trapezoid transition structure (7) is arranged on the top surface of the geogrid reinforcement layer (5) and is positioned between the box culvert structure (1) and the foundation bed layer (2) and the expansive soil foundation (3); the differential deformation self-adaptive structure layers (4) are arranged in a plurality, the differential deformation self-adaptive structure layers (4) are vertically and parallelly paved in the inverted trapezoid transition structure (7), one ends of the differential deformation self-adaptive structure layers (4) are connected with the box culvert structure (1), and the other ends extend into the foundation bed layer (2) from the inverted trapezoid transition structure (7); the upper grid layer (8) is paved above the box-type culvert structure (1), and the paving length of the upper grid layer (8) extends to at least 2m outside the inverted trapezoid transition structure (7).
2. The reinforced structure of the expansion soil road culvert transition section of the high-speed railway according to claim 1, wherein the box culvert structure (1) is a reinforced concrete structure, the longitudinal cross section of the box culvert structure (1) is a rectangular cavity, and two sides on a bottom plate of the box culvert structure (1) are respectively provided with a row of preset anchoring holes (1.1); the preset anchor holes (1.1) are arranged in a downward recessed manner from the upper surface of the bottom plate of the box culvert structure (1), and the recessed depth of the preset anchor holes (1.1) is not more than half of the thickness of the bottom plate of the box culvert structure (1).
3. The reinforced structure of the transition section of the expanded soil culvert of the high-speed railway according to claim 1, wherein a plurality of screw reinforcement pieces (1.2) which are arranged in a matrix form along the transverse direction and the vertical direction of the outer surfaces of the two side walls of the box culvert structure (1) are respectively arranged, and one end of each screw reinforcement piece (1.2) is provided with a hook; one end of the screw thread steel bar piece (1.2) without a hook stretches into the corresponding side wall of the box culvert structure (1) and is welded with steel bars on the inner side of the side wall, and the other end of the screw thread steel bar piece (1.2) with the hook is exposed out of the corresponding side wall of the box culvert structure (1).
4. A high-speed railway expansive soil road culvert transition section reinforcing structure according to claim 3, characterized in that said screw reinforcement member (1.2) is made of hot rolled ribbed steel bars having a diameter of not less than 18 mm; the hooks are semicircular, and the radius of the hooks is 8 cm-15 cm; the distance between the exposed end point of the screw reinforcement piece (1.2) and the outer surface of the corresponding side wall of the box culvert structure (1) is 10 cm-20 cm.
5. The reinforced structure of the expansion soil culvert transition section of the high-speed railway according to claim 1, wherein the differential deformation self-adaptive structural layer (4) comprises a plurality of limiting telescopic structures (4.1) and a geogrid layer (4.2), the limiting telescopic structures (4.1) comprise spring structures (4.12) with hooks (4.11) at two ends and elastic corrugated pipes (4.13), the spring structures (4.12) are arranged in cavities of the elastic corrugated pipes (4.13), and polyurethane foam (4.14) is filled in the cavities; the hooks (4.11) at one end of the limiting telescopic structures (4.1) are respectively connected with one end of the geogrid layer (4.2) at the same elevation, and the other end of the geogrid layer (4.2) extends into the foundation bed layer (2).
6. The reinforced structure of the transition section of the expanded soil culvert of the high-speed railway according to claim 5, wherein the differential deformation self-adaptive structural layer (4) is connected with the screw reinforcement piece (1.2) on the side wall of the box culvert structure (1) through hooks (4.11) at the other ends of a plurality of limiting telescopic structures (4.1) arranged in the differential deformation self-adaptive structural layer; the natural length of the elastic corrugated pipe (4.12) is 1-3 m, the maximum telescopic amplitude of the elastic corrugated pipe is 50cm, and prefabricated concrete cover blocks (4.15) for plugging are arranged at two ends of the elastic corrugated pipe (4.12).
7. The reinforced structure of the expansion soil culvert transition section of the high-speed railway according to claim 1, wherein the geogrid reinforcement layer (5) comprises an upper gravel layer (5.2) and a lower sand layer (5.3), and one geogrid (5.1) is arranged in each of the gravel layer (5.2) and the sand layer (5.3).
8. The reinforced structure of the transition section of the expansion soil road culvert of the high-speed railway according to claim 1, wherein the spiral pile (6) is formed by pouring reinforced concrete in situ, the cross section of the spiral pile (6) is circular, and a thread-shaped convex rib (6.1) is arranged on the pile wall of the spiral pile (6); main reinforcement (6.2) in screw pile (6) from top to bottom run through predetermine anchor hole (1.1) and whole screw pile (6), just the top of main reinforcement (6.2) is followed predetermine radial bending setting of anchor hole (1.1).
9. The reinforced structure of the expansion soil road culvert transition section of the high-speed railway according to claim 1, wherein the inverted trapezoid transition structure (7) is formed by filling graded broken stone doped with 2-3% of cement by mass fraction; the side face of the inverted trapezoid transition structure (7) is in contact with the foundation bed (2) and the expansive soil foundation (3) to form an inclined interface, and the inclined slope ratio of the interface is 1:2-1:5.
10. The construction method of the high-speed railway expansion soil road culvert transition section reinforcing structure is characterized by comprising the following steps of:
S1: according to the expansion characteristics and mechanical characteristics of the expansion soil of a construction site of the transition section, determining the design size, design parameters and arrangement form of each structural component, and manufacturing a reinforcement cage, a threaded reinforcement member (1.2), a limiting telescopic structure (4.1) and a hook (4.11); meanwhile, manufacturing a precast concrete cover block (4.15), and curing until the concrete has the designed strength;
S2: cleaning a construction site to meet construction operation requirements, excavating an expansive soil foundation (3) to a design elevation to form a transition section structure, and leveling the site; carrying out paying-off work according to the design layout, drilling pile holes for pouring the spiral piles (6) by adopting a long spiral drilling machine meeting the design parameter requirements of the pile body in a mode of extending from the central line of the expansive soil foundation (3) to two sides, placing reinforcement cages into the drilled pile holes, and pouring concrete to finally form the spiral piles (6); cutting off pile heads of redundant parts of pile tops of the spiral piles (6) according to the elevation of the pile tops after curing to the design strength of the concrete, and reserving main reinforcing steel bars (6.2);
S3: paving a geogrid reinforcement layer (5) on the top surface of the expansive soil foundation (3);
s4: firstly, installing a template and binding reinforcing steel bars on the top surface of the geogrid reinforcement layer (5) according to the design size and the reinforcement distribution requirement; simultaneously installing and welding a twisted steel member (1.2) according to a designed position, and reserving a preset anchoring hole (1.1) at the pile top position of the spiral pile (6); then, pouring concrete and continuously curing until the concrete is designed to be strong, and removing the template to form a box-type culvert structure (1);
S5: bending main steel bars (6.2) extending from the pile tops of the spiral piles (6) along the radial direction of the preset anchoring holes (1.1), then pouring concrete with the same grade strength as the box culvert structure (1) into the preset anchoring holes (1.1), and curing until the concrete reaches the design strength;
S6: firstly assembling a limiting telescopic structure (4.1), then filling polyurethane foam (4.14) into a cavity of an elastic corrugated pipe (4.13), and plugging two ends of the elastic corrugated pipe (4.13) by adopting a precast concrete cover block (4.15); secondly, filling and compacting graded broken stone doped with cement with mass fraction of 2% -3% on two sides of the box culvert structure (1) in a layered manner, timely installing and paving a differential deformation self-adaptive structure layer (4) at a position corresponding to a designed elevation, and synchronously filling and compacting a foundation bed layer (2) in a layered manner, wherein the differential deformation self-adaptive structure layer (4) is connected with a screw reinforcement piece (1.2) on the side wall of the box culvert structure (1) through a hook (4.11), and finally forms an inverted trapezoid transition structure (7);
s7: two geogrids are layered on the top surfaces of the box-type culvert structure (1) and the inverted trapezoid transition structure (7) to form an upper grid layer (8).
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