CN116732835A - Suspended roadbed structure and construction method - Google Patents
Suspended roadbed structure and construction method Download PDFInfo
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- CN116732835A CN116732835A CN202310416124.7A CN202310416124A CN116732835A CN 116732835 A CN116732835 A CN 116732835A CN 202310416124 A CN202310416124 A CN 202310416124A CN 116732835 A CN116732835 A CN 116732835A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 239000011381 foam concrete Substances 0.000 claims abstract description 77
- 238000010008 shearing Methods 0.000 claims abstract description 44
- 230000002787 reinforcement Effects 0.000 claims abstract description 19
- 239000010410 layer Substances 0.000 claims description 261
- 238000003466 welding Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 13
- 239000011150 reinforced concrete Substances 0.000 claims description 10
- 239000004567 concrete Substances 0.000 claims description 8
- 239000011083 cement mortar Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 238000009417 prefabrication Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 description 10
- 238000004062 sedimentation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004746 geotextile Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/50—Removable forms or shutterings for road-building purposes; Devices or arrangements for forming individual paving elements, e.g. kerbs, in situ
- E01C19/502—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a suspended roadbed structure and a construction method, and belongs to the technical field of deep soft soil roadbed engineering of high-filling road sections. The roadbed structure comprises a tubular pile supporting structure, a leveling layer, a shearing resistant layer and a pavement structure layer, wherein the leveling layer and the shearing resistant layer are foam concrete pouring layers, and the tubular pile comprises one or more lengths and can be spliced. The construction method comprises the steps of firstly roughly leveling through the pipe pile after the pipe pile is implanted into a foundation, then finely leveling through a leveling layer, pouring construction is carried out on the leveling layer and the shearing resistant layer through a temporary platform, a working surface constructed by a butt strap and a template bound on a rigid rod piece, and the leveling layer, the shearing resistant layer and the reinforcement layer are used for transmitting constant loads and live loads of a structure to a pile cap and the pipe pile. The roadbed structure and the construction method of the invention do not need pile cutting, and have excellent structural durability, economy and practicability.
Description
Technical Field
The invention relates to the technical field of deep soft soil roadbed engineering of a high-filling road section, in particular to a suspended roadbed structure and a construction method, which are suitable for highway roadbed construction.
Background
With the encryption of national road networks, more and more road engineering is carried out on complex stratum, and the deep soft soil roadbed engineering of high-filling road sections is the most common type. For the deep soft foundation engineering of the high-filling road section, a composite foundation method (a cement mixing pile composite foundation, a CFG pile composite foundation, a prefabricated pipe pile composite foundation and the like) is usually adopted for reinforcement, and when the type of road section has strict sedimentation requirements (such as the road section belongs to a highway section or a road bridge connecting section), a mode of combining the composite foundation method with a light embankment (a foam concrete roadbed structure) is further adopted. Hereinafter, the deep soft foundation engineering of the high-fill section with strict sedimentation requirements is simply referred to as "S engineering".
The prefabricated pipe pile composite foundation in the composite foundation method is favored by engineering technicians because the prefabricated pipe pile composite foundation has the advantages of convenience in construction and deep soft foundation reinforcement depth. Therefore, a mode of combining the precast tubular pile composite foundation with the foam concrete roadbed is often adopted in S engineering. The chinese patent (CN 217352404U) published by 9/2022, which is a deep soft soil foundation treatment structure, proposes a combined foundation treatment structure of reinforced concrete precast pile, reinforced concrete precast pile cap, cushion layer and foam concrete roadbed, wherein the foam concrete roadbed replaces the conventional filled roadbed to reduce the upper load, and the reinforced concrete precast pile, reinforced concrete precast pile cap and cushion layer transmit most of the upper load to a stable stratum below the soft soil layer, so as to achieve the effect of strictly controlling sedimentation. However, this method still has the following drawbacks:
(1) The pile top elevation of the reinforced concrete precast tubular pile is required to be uniform, the implantation length of the reinforced concrete precast tubular pile is difficult to control due to the fluctuation of the stratum in the actual construction process, the pile top elevation is uneven after construction, the pile top elevation needs to meet the design requirement by a pile cutting method, and the performance of the reinforced concrete precast tubular pile is damaged by pile cutting.
(2) The foam concrete roadbed has small weight (the common dry weight of roadbed engineering is 300 kg/m) -3 ～900kg/m -3 ) The friction force generated by the dead weight is only used for contacting with the composite foundation, and the up-down connectivity is poor. Factors such as ponding in rainy season easily have negative effects on the stability of the road base structure.
(3) The foam concrete in the structural form is poured from the top of the cushion layer to the bottom of the pavement base layer, and has large using amount and relatively poor economical efficiency.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and particularly provides a suspended roadbed structure and a construction method, which can effectively solve the technical problems and generate relatively large economic benefit from the integration of a reinforced foam concrete roadbed structure and a prefabricated pipe pile.
The invention aims to achieve the purpose, and provides a suspended roadbed structure which sequentially comprises a tubular pile supporting structure, a leveling layer, a shearing resistant layer and a pavement structure layer from bottom to top, wherein the leveling layer and the shearing resistant layer are foam concrete pouring layers, a plurality of reinforcement layers which are parallel to the shearing resistant layer are uniformly distributed in the shearing resistant layer, the foam concrete pouring layers are poured in a block and layer mode, and expansion joints are reserved between adjacent blocks;
the tubular pile supporting structure is composed of a plurality of tubular piles which are uniformly distributed, a pile cap is welded at the top of each tubular pile, one end of each tubular pile is vertically inserted into a bearing layer below the ground, the other end of each tubular pile is vertically suspended above the ground, and the elevation of each tubular pile meets the following design requirements: when the pipe pile is inserted into the bearing layer, the top end face of the pile cap is positioned in the leveling layer.
Preferably, a protective layer is formed on the side surface of the leveling layer, the side surface of the shearing resistant layer and the lower plane of the leveling layer by spraying cement mortar.
Preferably, the reinforcement material of the reinforcement layer is a geosynthetic material or a mesh of reinforcement.
Preferably, the distance between the tubular piles, the sectional area of the pile cap, the thickness of the leveling layer, the thickness of the shearing resistant layer, the weight of the foam concrete, the compressive strength of the foam concrete, the tensile strength of the foam concrete and the shearing strength of the foam concrete are required to meet the condition that the leveling layer and the shearing resistant layer are not damaged when the roadbed is in a normal working state.
Preferably, the fact that the leveling layer and the shearing resistant layer are not damaged means that the maximum compressive stress in the leveling layer and the shearing resistant layer in the three-dimensional finite element numerical simulation result of the suspended roadbed structure is smaller than the compressive strength of foam concrete, the maximum tensile stress is smaller than the tensile strength of the foam concrete, and the maximum shearing stress is smaller than the shearing strength of the foam concrete.
Preferably, the pipe pile comprises a reinforced pipe pile and a main pipe pile, and the lengths h0 of the two pipe piles are the same and satisfy: when the pipe pile is inserted into the bearing layer, the calculated elevation of the pile cap thickness value on the pile top Gao Chengjia is positioned between the upper plane of the leveling layer and a lowest reference plane; the lowest reference surface is lower than the lower plane of the leveling layer, the vertical distance between the lowest reference surface and the lower plane of the leveling layer is denoted as h2, the thickness of the leveling layer is denoted as h1, h2+h1 is less than h0, and the pipe piles are configured according to the height of each pipe pile inserted into the bearing layer, and the concrete steps are as follows:
after the pipe pile is inserted into the bearing layer, calculating Gao Chengwei the pile cap thickness value on the pile top Gao Chengjia in the leveling layer, taking the reinforced pipe pile as the pipe pile of N rows on two sides of the pipe pile supporting structure, and taking the main pipe pile as the pipe pile of N rows on the non-two sides of the pipe pile supporting structure;
when the calculated elevation of the pile cap thickness value on the pile top Gao Chengjia of the pile is positioned between the lower plane lower than the leveling layer and the lowest reference plane after the pile is inserted into the bearing layer, pile extension is carried out, and the concrete steps are as follows: if the pipe pile is a pipe pile of N rows on two sides of the pipe pile supporting structure, the pipe pile is composed of a reinforced pipe pile and M reinforced joint pipe piles welded on the top of the reinforced pipe pile; if the pipe pile is a pipe pile of N rows on the non-two sides of the pipe pile supporting structure, the pipe pile is composed of a main pipe pile and M main joint pipe piles welded on the top of the main pipe pile; the length h3=h1 of the reinforced joint pipe pile and the main joint pipe pile.
Preferably, the reinforced pipe pile, the main body pipe pile, the reinforced joint pipe pile, the main body joint pipe pile and the pile caps are all of reinforced concrete structures and are produced by adopting a prefabrication process, wherein pre-buried welding spots are distributed on the pile caps positioned on the pipe pile at the outermost side of the pipe pile supporting structure and the pile caps positioned on the pipe piles on the dividing pouring boundary line;
the sectional area of the reinforced pipe pile is larger than that of the main pipe pile.
The invention also provides a construction method of the suspended roadbed structure, which comprises the following steps:
step 7.1, determining the edge line of the tubular pile layout range
The side line of the pipe pile layout range is determined according to the central line of the road and the width of the leveling layer, and the concrete is that: the central line of the road is taken as the center, and the width values of the leveling layers are offset to two sides by one half, and then projected to the ground, wherein the projection range is the edge line of the tubular pile laying range;
step 7.2, determining the arrangement position of the tubular piles
The pipe pile laying position is determined according to the pipe pile laying range, the pipe pile spacing and the pipe pile laying form, and marking is carried out on site through measuring paying-off, wherein the projection on the horizontal plane of the embedded welding spot at the outermost side of the pipe pile cap which is furthest from the central line of the road is positioned at the outer side of the side line of the adjacent pipe pile laying range;
step 7.3, installing and adjusting the tubular pile
Installing and adjusting the tubular pile according to the determined design parameters of the leveling layer, wherein the design parameters of the leveling layer comprise the thickness of the leveling layer and the elevation of the lower plane of the leveling layer;
the pipe piles are installed by driving each pipe pile into a bearing layer through a mechanical device, and the adjustment is performed when the pipe piles do not meet the design requirements after being inserted into the bearing layer, specifically, the on-site pile splicing is performed;
step 7.4, mounting the temporary platform
The temporary platform consists of two identical rectangular flat plates, a part of round notch is formed in the center of one long side of each rectangular flat plate, the shape of the two rectangular flat plates after the notches are spaced and aligned is matched with the outer diameter of the tubular pile, and two through holes which are parallel to the short sides and penetrate through the direction of the plate body are formed in the two ends of each rectangular flat plate long side respectively;
after the gaps of the two rectangular flat plates are aligned at intervals and then clamped on the tubular pile, two threaded rods respectively penetrate through corresponding through holes of the two rectangular flat plates and are locked by nuts, namely, the two rectangular flat plates are combined into a temporary platform sleeved on the tubular pile, and the top surface of the temporary platform plus twice the thickness of the butt strap is flush with the lower plane of the leveling layer;
step 7.5, paving the butt strap
Firstly paving a layer of lapping plate between adjacent temporary platforms, namely forming a lapping plate layer formed by the lapping plates, then paving a layer of lapping plate on the upper part of the lapping plate layer to form a second lapping plate layer, ensuring that the second lapping plate layer is level with the lower plane of the leveling layer, completely covering the gaps between the adjacent temporary platforms by the lapping plate, and then paving a layer of impermeable geotextile on the second lapping plate layer;
step 7.6, fixing the side template of the foam concrete pouring layer
The foam concrete pouring layer is poured in a block and layer mode, the length of each foam concrete layer is parallel to the road running direction, the width of each foam concrete layer is perpendicular to the road running direction, and when in block, the boundary line of each foam concrete layer falls on a row or a column formed by pile caps, and pre-buried welding spots are reserved at corresponding positions of the upper end face and the lower end face of each pile cap;
welding a rigid rod piece on each embedded welding point adjacent to a foam concrete block pouring boundary line in each horizontal projection, wherein the bottom end of the rigid rod piece at the lower part is leveled with the upper end face of the temporary platform, and the top end of the rigid rod piece at the upper part is leveled with the upper plane of the shearing resistant layer, namely, a complete template support is formed on the boundary line of each foam concrete layer through a plurality of rigid rod pieces;
according to the designed layer height of layered pouring, the adaptive lateral templates are fixed on the rigid rod piece in a layered manner, namely, the pouring template of each foam concrete layer is formed;
step 7.7, pouring the leveling layer and the shearing resistant layer
Firstly, pouring a leveling layer;
then pouring the shearing resistant layer, specifically, in the pouring process, repeating the process of pouring the foam concrete and paving the reinforced material for A times according to the layer number A of the reinforced layer to form the reinforced layer and pouring the foam concrete;
when the leveling layer and the shearing resistant layer are cast in a layered manner, after one layer is cast, removing the lateral templates of the cast foam concrete on the two sides of the layer, and filling polystyrene materials into the gaps left after the removal to form expansion joints;
step 7.8, construction of pavement structure layer and removal of temporary member
Firstly, constructing a pavement structure layer, secondly, carrying out road maintenance, dismantling a temporary platform, a butt strap and the rest lateral templates after the road maintenance is finished, and spraying cement mortar on the lateral surface of the leveling layer, the lateral surface of the shearing resistant layer and the lower plane of the leveling layer to form a protective layer.
Compared with the prior art, the invention has the beneficial effects that:
(1) The suspended roadbed structure provided by the invention adopts the reinforced joint pipe pile and the main joint pipe pile to roughly level the pile top elevation, and then finely level the pile top elevation through the leveling layer, so that the pile cutting problem is avoided;
(2) The invention adopts the form that the two ends of the tubular pile supporting structure are respectively embedded into the foundation and the roadbed to strengthen the connection performance of the roadbed and the foundation, and simultaneously, the roadbed is suspended to avoid the negative influence of accumulated water on the stability of the roadbed in rainy seasons;
(3) The invention hangs the foam concrete in the air, which increases the length of the pipe pile, but saves a great amount of foam concrete, obviously saves the construction cost and has larger economic value.
Drawings
FIG. 1 is a schematic view of a suspended roadbed structure according to the present invention;
FIG. 2 is a three-dimensional view of a suspended roadbed structure according to the present invention during construction;
FIG. 3 is a schematic view of a pile cap embedded welding spot and a flange plate in an embodiment of the invention;
FIG. 4 is a schematic view of a temporary platform according to an embodiment of the present invention;
FIG. 5 is a schematic view of the location of the foam concrete blocks in an embodiment of the invention.
Wherein: 1. a bearing layer; 2. ground surface; 3. leveling layers, namely a temporary platform; 41, rectangular flat plate; 42. a threaded rod; 43. a screw cap; 5. a pile cap; 6. a reinforcement layer; 7. a shear layer; 8. a pavement structural layer; 9. a butt strap; 10. a rigid rod member; 11. a protective layer; 12. pre-burying welding spots; 13. reinforced pipe piles; 14. a main body pipe pile; 15. reinforced joint pipe piles; 16. a main body joint pipe pile; 17. a lateral template; 18. an expansion joint; 19. and a flange plate.
Detailed Description
The invention will be further described with reference to specific examples and figures.
Fig. 1 is a schematic structural diagram of a suspended roadbed according to the present invention, as can be seen from fig. 1, the suspended roadbed structure sequentially includes, from bottom to top, a tubular pile supporting structure, a leveling layer 3, a shearing resistant layer 7, and a pavement structural layer 8, wherein the leveling layer 3 and the shearing resistant layer 7 are foam concrete pouring layers, a plurality of reinforcement layers 6 parallel to the shearing resistant layer 7 are uniformly arranged in the shearing resistant layer 7, the foam concrete pouring layers are poured in a block and layer manner, and expansion joints 18 are left between adjacent blocks.
The tubular pile supporting structure is composed of a plurality of tubular piles which are uniformly distributed, a pile cap 5 is welded at the top of each tubular pile, one end of each tubular pile is vertically inserted into the bearing layer 1 below the ground 2, the other end of each tubular pile is vertically suspended above the ground 2, and the height of each tubular pile meets the following design requirements: when the pipe pile is inserted into the bearing layer 1, the top end face of the pile cap 5 is positioned in the leveling layer 3.
In this embodiment, the side surface of the leveling layer 3, the side surface of the shear layer 7, and the lower plane of the leveling layer 3 are all formed with a protective layer 11 by spraying cement mortar.
In this embodiment, the reinforcement material of the reinforcement layer 6 is a geosynthetic material or a mesh of reinforcement bars.
In this embodiment, the distance between the piles, the sectional area of the pile cap 5, the thickness of the leveling layer 3, the thickness of the shear layer 7, the foam concrete weight, the foam concrete compressive strength, the foam concrete tensile strength and the foam concrete shear strength should satisfy that the leveling layer 3 and the shear layer 7 are not damaged when the subgrade is in a normal working state.
The fact that the leveling layer 3 and the shearing resistant layer 7 are not damaged means that the maximum compressive stress in the leveling layer and the shearing resistant layer in the three-dimensional finite element numerical simulation result of the suspended roadbed structure is smaller than the compressive strength of foam concrete, the maximum tensile stress is smaller than the tensile strength of the foam concrete, and the maximum shearing stress is smaller than the shearing strength of the foam concrete.
In this embodiment, the tube stake includes a reinforced tube stake 13 and a main body tube stake 14, the lengths h0 of which are the same and satisfy: after the pipe pile is inserted into the bearing layer 1, the calculated elevation of the pile top elevation plus the thickness value of the pile cap 5 is positioned between the upper plane of the leveling layer 3 and a lowest reference plane; the lowest reference surface is lower than the lower plane of the leveling layer 3, the vertical distance between the lowest reference surface and the lower plane of the leveling layer 3 is denoted as h2, the thickness of the leveling layer 3 is denoted as h1, h2+ h1 < h0, and the pipe piles are configured according to the elevation of each pipe pile inserted into the bearing layer 1, specifically as follows:
when the pipe pile is inserted into the bearing layer 1, the calculated height of the pile top height plus the thickness value of the pile cap 5 is positioned in the leveling layer 3, the reinforced pipe pile 13 is taken as the pipe pile of N rows on two sides of the pipe pile supporting structure, and the main pipe pile 14 is taken as the pipe pile of N rows on the non-two sides of the pipe pile supporting structure;
when the calculated height of the pile top height plus the thickness value of the pile cap 5 is positioned between the lower plane lower than the leveling layer 3 and the lowest reference plane after the pipe pile is inserted into the bearing layer 1, pile splicing is carried out, and the concrete steps are as follows: if the pipe pile is a pipe pile of N rows on two sides of the pipe pile supporting structure, the pipe pile is composed of a reinforced pipe pile 13 and M reinforced joint pipe piles 15 welded on the top of the reinforced pipe pile 13; if the pipe pile is a pipe pile of N rows on the non-two sides of the pipe pile supporting structure, the pipe pile is composed of a main body pipe pile 14 and M main body joint pipe piles 16 welded on the top of the main body pipe pile 14; the length h3=h1 of the reinforced joint pipe pile 15 and the main body joint pipe pile 16.
The pipe piles of the N rows on the two sides of the pipe pile supporting structure refer to 2N pipe pile longitudinal rows which are formed by the two sides of the road and are parallel to the running direction of the road. As can be seen from fig. 1 and 2, in this example, n=1, so in fig. 1 and 2, only the piles in the left and right outermost columns of the pile supporting structure employ the reinforced type piles 13.
In this embodiment, the reinforced pipe pile 13, the main body pipe pile 14, the reinforced joint pipe pile 15, the main body joint pipe pile 16 and the pile cap 5 are all of reinforced concrete structures and are produced by adopting a prefabrication process, wherein the pile cap 5 positioned on the pipe pile at the outermost side of the pipe pile supporting structure and the pile cap 5 positioned on the pipe pile on the dividing line of block pouring are provided with pre-buried welding spots 12.
The sectional area of the reinforced pipe pile 13 is larger than that of the main pipe pile 14.
In this embodiment, specific parameters are as follows: the length of the reinforced pipe pile 13 and the length of the main body pipe pile 14 are respectively 5m-30m, the length of the reinforced joint pipe pile 15 and the length of the main body joint pipe pile 16 are respectively 0.5m-5.0m, the outer diameters of the reinforced pipe pile 13 and the reinforced joint pipe pile 15 are respectively 400mm-1400mm, the wall thicknesses are respectively 95mm-150mm, and the outer diameters of the main body pipe pile 14 and the main body joint pipe pile 16 are respectively 300mm-1300mm, and the wall thicknesses are respectively 60mm-150mm.
In this embodiment, the flange 19 is pre-buried between the reinforced pipe pile 13 and the main body pipe pile 14, between the reinforced joint pipe pile 15 and the main body joint pipe pile 16, and between the pile cap 5, between the reinforced pipe pile 13 and the reinforced pipe pile 13, between the reinforced pipe pile 13 and the reinforced joint pipe pile 15, between the reinforced joint pipe pile 15 and the reinforced joint pipe pile 15, between the main body pipe pile 14 and the main body pipe pile 14, between the main body pipe pile 14 and the main body joint pipe pile 16, and between the main body joint pipe pile 16 and the main body joint pipe pile 16. Fig. 3 shows the position of the flange 19 on the bottom end surface of the pile cap 5 in this embodiment, and also shows the position of the pre-buried welding spot 12 on the pile cap 5. As can be seen in fig. 3, the pile cap 5 is a cylinder with a rectangular cross section.
The construction method of the suspended roadbed structure provided by the invention comprises the following steps:
step 7.1, determining the edge line of the tubular pile layout range
The side line of the pipe pile layout range is determined according to the central line of the road and the width of the leveling layer 3, and the concrete is that: the central line of the road is taken as the center, and the width value of the leveling layer 3 which is offset to two sides by one half is projected to the ground 2, and the projection range is the edge line of the tubular pile laying range.
Step 7.2, determining the arrangement position of the tubular piles
The pipe pile laying position is determined according to the pipe pile laying range, the pipe pile spacing and the pipe pile laying form, and marking is carried out on site through measuring paying-off, wherein the projection on the horizontal plane of the embedded welding spots 12 on the outermost side of the pipe pile cap 5 which is furthest from the central line of the road is positioned on the outer side of the side line adjacent to the pipe pile laying range;
step 7.3, installing and adjusting the tubular pile
Installing and adjusting the tubular pile according to the determined design parameters of the leveling layer 3, wherein the design parameters of the leveling layer 3 comprise the thickness of the leveling layer 3 and the elevation of the lower plane of the leveling layer 3;
the pipe piles are installed by driving each pipe pile into the bearing layer 1 through a mechanical device, and the adjustment is performed when the pipe piles do not meet the design requirements after being inserted into the bearing layer 1, specifically, the on-site pile splicing is performed;
step 7.4, installation of temporary platform 4
Fig. 2 is a three-dimensional structure view of a suspended roadbed structure in the construction process according to the present invention, and fig. 4 is a schematic view of a temporary platform structure according to an embodiment of the present invention. As can be seen from fig. 2 and fig. 4, the temporary platform 4 is formed by two identical rectangular flat plates 41, a partial circular notch is formed in the center of one side long side of each rectangular flat plate 41, the notches of the two rectangular flat plates 41 are spaced and aligned to form a shape matching with the outer diameter of the tubular pile, and two through holes parallel to the short sides and penetrating through the directions of the plate bodies are formed at two ends of the long side of each rectangular flat plate 41.
After the gaps of the two rectangular flat plates 41 are clamped on the tubular pile after being spaced and aligned, two threaded rods 42 respectively penetrate through corresponding through holes of the two rectangular flat plates 41 and are locked by nuts 43, namely the two rectangular flat plates 41 are combined into a temporary platform 4 sleeved on the tubular pile, and the top surface of the temporary platform 4 plus twice the thickness of the butt strap 9 is flush with the lower plane of the leveling layer 3.
Step 7.5, laying the butt strap 9
Firstly paving a layer of bonding plates 9 between adjacent temporary platforms 4 to form a bonding plate layer formed by the bonding plates 9, then paving a layer of bonding plates 9 at the upper part of the bonding plates to form a second bonding plate layer, ensuring that the second bonding plate layer is level with the lower plane of the leveling layer 3, and completely covering the gaps between the adjacent temporary platforms 4 by the bonding plates 9; then, a layer of impermeable geotextile is paved on the second lapping layer.
Step 7.6, fixing the foam concrete casting layer side form 17
The foam concrete pouring layer is poured in a block and layer mode, the length of each foam concrete layer is parallel to the road running direction, the width of each foam concrete layer is perpendicular to the road running direction, and when in block, the boundary line of each foam concrete layer falls on a row or a column formed by the pile caps 5, and pre-buried welding spots 12 are reserved at corresponding positions of the upper end face and the lower end face of the pile caps 5.
Welding a rigid rod piece 10 on each embedded welding point 12 adjacent to the foam concrete block pouring boundary line in each horizontal projection, wherein the bottom end of the lower rigid rod piece 10 is leveled with the upper end face of the temporary platform 4, and the top end of the upper rigid rod piece 10 is leveled with the upper plane of the shear layer 7, namely, a complete template support is formed on the boundary line of each foam concrete layer through a plurality of rigid rod pieces 10;
and according to the designed layer height of layered pouring, the matched lateral templates 17 are fixed on the rigid rod piece 10 in a layered manner, namely, the pouring template of each foam concrete layer is formed.
In the embodiment, the thickness of the single layer casting of the foam concrete is 0.3m-1.0m. The rigid rod piece 10 is a round steel pipe with the outer diameter of 1cm-3cm or a square steel pipe with the outer length of 1cm-3 cm.
FIG. 5 is a schematic view of the location of the foam concrete blocks in an embodiment of the invention.
Step 7.7, pouring the leveling layer 3 and the shear layer 7
Firstly, pouring a leveling layer 3;
then pouring the shear layer 7, specifically, in the pouring process, repeating the process of pouring the foam concrete and paving the reinforced material for A times according to the layer number A of the reinforced layer 6 to form the reinforced layer 6-pouring the foam concrete;
when the shear layer foam concrete of the leveling layer 3 and the shear layer 7 is poured in layers, after one layer is poured, the lateral templates 17 of which foam concrete is poured on two sides of the layer are removed, and polystyrene materials are filled in gaps left after the lateral templates are removed, so that expansion joints 18 are formed.
In this embodiment, a=1, i.e. the reinforcement layer 6 is one layer. The concrete pouring process is as follows:
pouring foam concrete with the thickness of 0.5m on the leveling layer 3;
laying a layer of reinforcement material to form a first layer of reinforcement layer 6;
and pouring foam concrete.
Step 7.8 construction of pavement Structure layer 8 and removal of temporary Member
Firstly, constructing a pavement structural layer, secondly, carrying out road maintenance, dismantling the temporary platform 4, the access boards 9 and the residual lateral templates 17 after the road maintenance is finished, and spraying cement mortar on the side surfaces of the leveling layer 3, the side surfaces of the shearing resistant layer 7 and the lower plane of the leveling layer 3 to form the protection layer 11.
Claims (7)
1. The suspended roadbed structure is characterized by sequentially comprising a tubular pile supporting structure, a leveling layer (3), a shearing resistant layer (7) and a pavement structure layer (8) from bottom to top, wherein the leveling layer (3) and the shearing resistant layer (7) are foam concrete pouring layers, a plurality of reinforcement layers (6) parallel to the shearing resistant layer (7) are uniformly arranged in the shearing resistant layer (7), the foam concrete pouring layers are poured in a block and layer mode, and expansion joints (18) are reserved between adjacent blocks;
the tubular pile supporting structure is composed of a plurality of tubular piles which are uniformly distributed, a pile cap (5) is welded at the top of each tubular pile, one end of each tubular pile is vertically inserted into a bearing layer (1) below the ground (2), the other end of each tubular pile is vertically suspended above the ground (2), and the elevation of each tubular pile meets the following design requirements: after the pipe pile is inserted into the bearing layer (1), the top end face of the pile cap (5) is positioned in the leveling layer (3).
2. The suspended roadbed structure according to claim 1, wherein a protective layer (11) is formed by spraying cement mortar on the side surface of the leveling layer (3), the side surface of the shearing resistant layer (7) and the lower plane of the leveling layer (3).
3. A suspended roadbed structure according to claim 1, characterized in that the reinforcement material of the reinforcement layer (6) is a geosynthetic material or a mesh of reinforcement.
4. The suspended roadbed structure according to claim 1, wherein the distance between the pipe piles, the sectional area of the pile caps (5), the thickness of the leveling layer (3), the thickness of the shearing resistant layer (7), the weight of foam concrete, the compressive strength of foam concrete, the tensile strength of foam concrete and the shear strength of foam concrete are required to meet the requirement that the leveling layer (3) and the shearing resistant layer (7) are not damaged when the roadbed is in a normal working state.
The fact that the leveling layer (3) and the shearing resistant layer (7) are not damaged means that the maximum compressive stress in the leveling layer (3) and the shearing resistant layer (7) in the three-dimensional finite element numerical simulation result of the suspended roadbed structure is smaller than the compressive strength of foam concrete, the maximum tensile stress is smaller than the tensile strength of the foam concrete, and the maximum shearing stress is smaller than the shearing strength of the foam concrete.
5. A suspended roadbed structure according to claim 1, characterized in that the piles comprise reinforced piles (13) and main body piles (14), the lengths h0 of the two piles being the same and satisfying: after the pipe pile is inserted into the bearing layer (1), the calculated height of the pile top height plus the thickness value of the pile cap (5) is positioned between the upper plane of the leveling layer (3) and a lowest reference plane; the lowest reference surface is lower than the lower plane of the leveling layer (3), the vertical distance between the lowest reference surface and the lower plane of the leveling layer (3) is recorded as h2, the thickness of the leveling layer (3) is recorded as h1, h2+h1 is less than h0, the pipe piles are configured according to the elevation of each pipe pile inserted into the bearing layer (1), and the concrete steps are as follows:
after the pipe pile is inserted into the bearing layer (1), the calculated height of the pile top height plus the thickness value of the pile cap (5) is positioned in the leveling layer (3), the reinforced pipe pile (13) is taken as the pipe pile of N rows on two sides of the pipe pile supporting structure, and the main pipe pile (14) is taken as the pipe pile of N rows on the non-two sides of the pipe pile supporting structure;
when the tubular pile is inserted into the bearing layer (1), and the calculated height of the pile top height plus the thickness value of the pile cap (5) is positioned between the lower plane lower than the leveling layer (3) and the lowest reference plane, pile extension is carried out, and the concrete steps are as follows: if the pipe pile is a pipe pile of N rows on two sides of the pipe pile supporting structure, the pipe pile is composed of a reinforced pipe pile (13) and M reinforced joint pipe piles (15) welded on the top of the reinforced pipe pile (13); if the pipe pile is a pipe pile of N rows on the non-two sides of the pipe pile supporting structure, the pipe pile is composed of a main body pipe pile (14) and M main body joint pipe piles (16) welded on the top of the main body pipe pile (14); the length h3=h1 of the reinforced joint pipe pile (15) and the main body joint pipe pile (16).
6. The suspended roadbed structure according to claim 5, wherein the reinforced pipe piles (13), the main pipe piles (14), the reinforced joint pipe piles (15), the main joint pipe piles (16) and the pile caps (5) are all reinforced concrete structures and are produced by adopting a prefabrication process, wherein pre-buried welding spots (12) are distributed on the pile caps (5) positioned on the pipe piles at the outermost side of the pipe pile supporting structure and the pile caps (5) positioned on the pipe piles on the parting line of block casting;
the sectional area of the reinforced tubular pile (13) is larger than that of the main tubular pile (14).
7. A construction method of a suspended roadbed structure according to any one of claims 1 to 6, characterized in that the construction method comprises the following steps:
step 7.1, determining the edge line of the tubular pile layout range
The side line of the pipe pile layout range is determined according to the central line of the road and the width of the leveling layer (3), and is specific: the central line of the road is taken as the center, and the width value of the leveling layer (3) is offset to two sides by one half, and then the leveling layer is projected to the ground (2), wherein the projection range is the edge line of the tubular pile laying range;
step 7.2, determining the arrangement position of the tubular piles
The pipe pile laying position is determined according to the pipe pile laying range, the pipe pile spacing and the pipe pile laying form, and marking is carried out on site through measuring paying-off, wherein the projection on the horizontal plane of the embedded welding spot (12) on the outermost side of the pipe pile cap (5) which is furthest from the central line of the road is positioned at the outer side of the side line of the adjacent pipe pile laying range;
step 7.3, installing and adjusting the tubular pile
Installing and adjusting the tubular pile according to the determined design parameters of the leveling layer (3), wherein the design parameters of the leveling layer (3) comprise the thickness of the leveling layer (3) and the elevation of the lower plane of the leveling layer;
the pipe piles are installed by driving each pipe pile into the bearing layer (1) through a mechanical device, and the adjustment is performed when the pipe piles do not meet the design requirement after being inserted into the bearing layer (1), in particular to on-site pile splicing;
step 7.4, mounting the temporary platform (4)
The temporary platform (4) is composed of two identical rectangular flat plates (41), a part of round notch is formed in the center of one long side of each rectangular flat plate (41), the notches of the two rectangular flat plates (41) are matched with the outer diameter of the tubular pile in shape after being spaced and aligned, and two through holes which are parallel to the short sides and penetrate through the directions of the plate bodies are formed in the two ends of the long side of each rectangular flat plate (41);
after gaps of the two rectangular flat plates (41) are aligned at intervals and then clamped on the tubular pile, two threaded rods (42) respectively penetrate through corresponding through holes of the two rectangular flat plates (41) and are locked by nuts (43), namely the two rectangular flat plates (41) are combined into a temporary platform (4) sleeved on the tubular pile, and the top surface of the temporary platform (4) is level with the lower plane of the leveling layer (3) together with the thickness of the double-layer butt strap (9);
step 7.5, laying the butt strap (9)
Firstly paving a layer of bonding plates (9) between adjacent temporary platforms (4), namely forming a bonding plate layer formed by the bonding plates (9), then paving a layer of bonding plates (9) at the upper part of the bonding plates to form a second bonding plate layer, ensuring that the second bonding plate layer is flush with the lower plane of the leveling layer (3), completely covering the gaps between the adjacent temporary platforms (4) by the bonding plates (9), and then paving a layer of impermeable geotechnical cloth on the second bonding plate layer;
step 7.6, fixing the foam concrete pouring layer side form (17)
The foam concrete pouring layers are poured in a block-by-block layered mode, the length of each foam concrete layer is parallel to the road running direction, the width of each foam concrete layer is perpendicular to the road running direction, and when in block, the boundary line of each foam concrete layer falls on a row or a column formed by the pile caps (5), and pre-buried welding spots (12) are reserved at corresponding positions of the upper end surfaces and the lower end surfaces of the pile caps (5);
welding a rigid rod piece (10) on each embedded welding point (12) adjacent to a foam concrete block pouring boundary line in each horizontal projection, wherein the bottom end of the rigid rod piece (10) at the lower part is leveled with the upper end face of the temporary platform (4), and the top end of the rigid rod piece (10) at the upper part is leveled with the upper plane of the shear layer (7), namely, a complete template support is formed on the boundary line of each foam concrete layer through a plurality of rigid rod pieces (10);
according to the designed layer height of layered pouring, the adaptive lateral templates (17) are fixed on the rigid rod piece (10) in a layered manner, namely, the pouring template of each foam concrete layer is formed;
7.7, pouring the leveling layer (3) and the shearing resistant layer (7)
Firstly, pouring a leveling layer (3);
then pouring the shearing resistant layer (7), specifically, in the pouring process, repeating the process of pouring the foam concrete and paving the reinforced material for A times according to the layer number A of the reinforced layer (6) to form the reinforced layer (6) -pouring the foam concrete;
when the shear layer foam concrete of the leveling layer (3) and the shear layer (7) is poured in layers, after one layer is poured, removing the lateral templates (17) of which foam concrete is poured on both sides of the layer, and filling polystyrene materials into gaps left after the removal to form expansion joints (18);
step 7.8 construction of pavement Structure layer (8) and removal of temporary Member
Firstly, constructing a pavement structure layer, secondly, carrying out road maintenance, dismantling the temporary platform (4), the access boards (9) and the residual lateral templates (17) after the road maintenance is finished, and spraying cement mortar on the side surface of the leveling layer (3), the side surface of the shearing resistant layer (7) and the lower plane of the leveling layer (3) to form the protective layer (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310416124.7A CN116732835A (en) | 2023-04-13 | 2023-04-13 | Suspended roadbed structure and construction method |
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| CN202310416124.7A CN116732835A (en) | 2023-04-13 | 2023-04-13 | Suspended roadbed structure and construction method |
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