CN210315101U - Prestressed EPS roadbed widening structure - Google Patents
Prestressed EPS roadbed widening structure Download PDFInfo
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- CN210315101U CN210315101U CN201920510864.6U CN201920510864U CN210315101U CN 210315101 U CN210315101 U CN 210315101U CN 201920510864 U CN201920510864 U CN 201920510864U CN 210315101 U CN210315101 U CN 210315101U
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Abstract
The utility model relates to a structure is widened to prestressing type EPS road bed, be equipped with a plurality of steps on original road bed, set up the reinforced concrete bottom plate widening the road bed bottom, lay rubble drainage blanket on the reinforced concrete bottom plate, set up the reinforced concrete baffle widening the road bed side newly, EPS foamed plastic block lays on the step of rubble drainage blanket and original road bed, EPS foamed plastic block's top sets up the reinforced concrete loading board, in the reinforced concrete bottom plate, anchor the pull rod reinforcing bar respectively in each step of original road bed and the original road bed of close proximity step, and the pull rod reinforcing bar is worn out EPS foamed plastic block and reinforced concrete loading board, the nut prestressing force is screwed on each pull rod reinforcing bar to the steel backing plate cover, pavement structure layer. The utility model discloses there is new and old road bed deformation difference that vehicle live load arouses in can effectively eliminating EPS road bed expansion to lead to the technological problem of road surface fracture, unstability disease, promotes the wide application of EPS road bed material in highway engineering.
Description
Technical Field
The utility model relates to a structure is widened to prestressing force type EPS road bed.
Background
Along with the large-scale reconstruction and upgrading of highways in China, the splicing and widening projects of the original roadbed are continuously increased, the longitudinal cracking diseases of the road surface are easily caused by the settlement difference between the original roadbed and the newly-built roadbed, even the integral instability of the newly-built and widened roadbed is caused, the differential settlement diseases are more prominent in plain areas where soft soil develops, and the EPS (polystyrene foam) foam plastic block serving as a light roadbed filler can effectively reduce the settlement of the roadbed foundation, so that the EPS foam plastic block is an ideal roadbed widening and splicing filling material.
However, the EPS foamed plastic is an elastic material, and can generate elastic deformation under the action of compressive stress, and through calculation, under the action of standard live load of a highway I grade, when a vehicle passes through the EPS foamed plastic roadbed with the filling height of 5m (the elastic modulus is calculated according to 3000 KPa), additional compressive stress of about 20KPa can be formed on a 10m long top protection panel, and elastic deformation of about 30mm can be generated, namely, a settlement difference is formed between a newly-built roadbed and an existing roadbed, so that longitudinal pavement cracking diseases can be formed between the new roadbed and the old roadbed under the repeated action of the vehicle, and in the actual operation of the highway, the settlement difference is more serious than the calculation result due to the problems of vehicle overload, insufficient rigidity of concrete slabs, compact EPS stacking and the like.
Aiming at the technical problem in the practical application of the EPS foam light-weight widened roadbed, the invention provides an EPS roadbed widened structure capable of effectively eliminating the vehicle live load additional stress deformation and a construction method thereof, and promotes the popularization and application of an EPS foam filling material.
Disclosure of Invention
For solving technical problem among the background art, the utility model provides a structure is widened to prestressing type EPS road bed can effectively eliminate the EPS road bed and widen the vehicle live load that exists and arouse new, old road bed and warp the inequality, finally leads to the technical problem of road surface fracture, the whole unstability of road bed, promotes the wide application of the novel road bed material of EPS in the highway field.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the utility model provides a structure is widened to prestressing force type EPS road bed which characterized in that: the method comprises the steps of arranging a plurality of steps on an original roadbed until the lowest step is connected with the bottom of a newly widened roadbed, arranging a reinforced concrete bottom plate at the bottom of the newly widened roadbed, paving a broken stone drainage layer on the reinforced concrete bottom plate, arranging a reinforced concrete baffle plate on the side face of the newly widened roadbed, paving EPS foam plastic blocks on the broken stone drainage layer and the steps of the original roadbed, arranging a reinforced concrete bearing plate at the top of the EPS foam plastic blocks, respectively anchoring pull rod reinforcing steel bars in the reinforced concrete bottom plate, in each step excavated on the original roadbed and in an overexcavation section at the top of the original roadbed, penetrating the pull rod reinforcing steel bars out of the EPS foam plastic blocks and the reinforced concrete bearing plate, sleeving steel backing plates on each pull rod reinforcing steel bar, and locking the steel backing plates by nuts after applying prestress on the pull rod reinforcing.
The number of steps arranged on the original roadbed is 2-8, and the width of each step is 100-200 cm.
The reinforced concrete bottom plate is 15-30 cm thick.
The thickness of the gravel drainage layer is 10-20 cm, and the particle size of gravel is 2-4 cm.
The thickness of the reinforced concrete baffle is 30-50 cm.
The thickness of the reinforced concrete bearing plate is 20-40 cm.
A construction method of a prestressed EPS roadbed widening structure is carried out according to the following steps: excavating steps on the original roadbed until the lowest step is connected with the bottom of the newly-widened roadbed; laying a reinforced concrete bottom plate at the bottom of a newly-widened roadbed, laying a bottom broken stone drainage layer on the reinforced concrete bottom plate, arranging a reinforced concrete baffle on the side face of the newly-widened roadbed, arranging anchor rods in the reinforced concrete bottom plate, pull rod steel bars in steps excavated on the original roadbed and in an overexcavation section at the top of the original roadbed, laying EPS foam plastic blocks on the broken stone drainage layer and the steps of the original roadbed, enabling the pull rod steel bars to penetrate the EPS foam plastic blocks, arranging a reinforced concrete bearing plate at the top of the EPS foam plastic blocks, enabling the pull rod steel bars to penetrate the EPS foam plastic blocks and the reinforced concrete bearing plate, locking prestress by utilizing nuts after applying prestress on the pull rod steel bars, and paving a pavement structure layer.
A construction method of a prestressed EPS roadbed widening structure comprises the following specific steps:
step one, excavating steps on an original roadbed: cleaning the surface layer of the original roadbed, and excavating steps with the width of 100-200 cm until the slope toe of the roadbed;
step two, arranging a reinforced concrete bottom plate at the base part of the newly-widened roadbed: C20-C40 concrete is adopted, the thickness is 15-30 cm, double layers of transverse and longitudinal steel bars are arranged, the diameter of the steel bars is phi 14-18 mm, the distance is 200-400 mm, the transverse steel bars are bent by 90 degrees and extend into the reinforced concrete baffle to be not less than 100cm, and the transverse steel bars are conveniently connected with the vertical steel bars in the reinforced concrete baffle at the later stage;
paving a gravel drainage layer on the reinforced concrete bottom plate, wherein gravel with the nominal particle size of 2-4 cm is adopted, and the thickness of the gravel drainage layer is 10-20 cm;
step four, arranging a reinforced concrete baffle on the side surface of the roadbed: C20-C40 concrete is adopted, the thickness is 30-50 cm, double rows of horizontal and vertical steel bars are arranged, the diameter of the steel bars is phi 14-18 mm, the distance is 200-400 mm, and the vertical steel bars are welded with reserved transverse steel bars in a reinforced concrete bottom plate or mechanically connected with sleeves;
step five, setting the tie rod reinforcing steel bars anchored in the reinforced concrete bottom plate, the original roadbed steps and the original roadbed overexcavation section: anchoring a pull rod steel bar in the concrete bottom plate, wherein the pull rod steel bar extends to the bottom of the reinforced concrete bottom plate, is provided with a 90-degree hook, is 15-30 cm long and is welded with a transverse steel bar of the bottom plate; firstly, drilling holes downwards at the steps and the overexcavation sections of the original roadbed, wherein the hole diameter is 90-110 mm, the depth is 300-800 cm, and pouring M30 cement mortar for anchoring after the pull rod steel bar is inserted; the pull rod steel bars are phi 22-36 HRB400 steel bars, are arranged in a square shape or an equilateral triangle shape, are arranged at intervals of 1.2-2.5 m, can be lengthened in sections, are mechanically connected by sleeves, and straight threads are pre-machined at the top ends of the pull rod steel bars according to the models of matched equal-strength nuts;
step six, filling the roadbed by using EPS foam plastic blocks: the EPS foam plastic block is regularly arranged on a gravel drainage layer and steps of an original roadbed, holes can be punched on the foam plastic block when meeting the pull rod steel bars, and the pull rod steel bars can penetrate through the holes;
step seven, the reinforced concrete bearing plate: C20-C40 concrete is adopted, the thickness is 20-40 cm, double-layer transverse and longitudinal steel bars are arranged, the diameter of the steel bars is 14-20 mm, the distance is 100-200 mm, holes with the diameter of 30-50 mm are reserved at the pull rod steel bars during pouring, the pull rod steel bars can conveniently penetrate through the holes, a groove with the depth of 6-10 cm is formed in the top of a reinforced concrete bearing plate of each pull rod steel bar, and the groove with the depth of 30cm multiplied by 30cm is formed in the top of the reinforced concrete bearing;
step eight, sleeving a steel base plate on the pull rod steel bar of each groove, adopting a steel plate of 20cm multiplied by 20cm as a pressure-bearing steel base plate, wherein the thickness of the steel base plate is 10-20 mm, applying prestress, then utilizing a nut to twist and fix the steel base plate, detecting that the prestress reaches a design value, fixing the nut and the pull rod steel bar in a spot welding manner, and finally pouring hot-melt rubber in the groove for filling and sealing;
step nine, paving the pavement structure layer: after the EPS roadbed widening construction is finished, paving operation of a pavement structure layer is carried out on the surface.
The utility model discloses a prestressing force type EPS road bed is widened structure can effectively eliminate the vehicle live load that exists and arouse new, old road bed and warp inequality in the EPS road bed is widened, finally leads to the technical problem of road surface fracture, the whole unstability of road bed, promotes the wide application of the novel road bed material of EPS in the highway field.
Drawings
Fig. 1 is the utility model discloses the schematic diagram of structure is widened to prestressing force type EPS road bed.
Fig. 2 is the utility model discloses a pull rod reinforcing bar tip nut locking node schematic diagram.
Illustration of the drawings:
1-original roadbed side slope, 2-original roadbed excavation step, 3-original roadbed top face overexcavation, 4-reinforced concrete bottom plate, 5-tie rod reinforcing steel bar, 6-rubble cushion layer, 7-reinforced concrete baffle, 8-EPS foam plastic block, 9-reinforced concrete bearing plate, 10-reserved groove, 11-pavement structure layer, 12-reserved tie rod hole, 13-steel backing plate, 14-nut, 15-hot melt rubber.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1 and fig. 2, the utility model discloses a structure is widened to prestressing force type EPS road bed, its characterized in that: the method comprises the steps of arranging six steps on an original roadbed until the lowest step is connected with the bottom of a newly widened roadbed, arranging a reinforced concrete bottom plate at the bottom of the newly widened roadbed, paving a broken stone drainage layer on the reinforced concrete bottom plate, arranging a reinforced concrete baffle plate on the side face of the newly widened roadbed, paving EPS foam plastic blocks on the broken stone drainage layer and the steps of the original roadbed, arranging a reinforced concrete bearing plate at the top of the EPS foam plastic blocks, respectively anchoring pull rod reinforcing steel bars in the reinforced concrete bottom plate, in each step excavated on the original roadbed and in an overexcavation section at the top of the original roadbed, penetrating the pull rod reinforcing steel bars out of the EPS foam plastic blocks and the reinforced concrete bearing plate, sleeving steel backing plates on the pull rod reinforcing steel bars, applying prestress on the pull rod reinforcing steel bars, locking the steel backing plates by nuts and. The width of each step was 100 cm. The reinforced concrete bottom plate is 30cm thick. The thickness of the gravel drainage layer is 10cm, and the particle size of gravel is 3 cm. The reinforced concrete baffle is 30cm thick. The thickness of the reinforced concrete bearing plate is 30 cm.
A construction method of a prestressed EPS roadbed widening structure is characterized by comprising the following specific steps:
(1) performing surface cleaning treatment on the original roadbed slope, excavating steps, wherein the width of each step is 100-200 cm, and the top surface of the original roadbed is subjected to inward overexcavation for 100-200 cm;
(2) excavating a foundation pit at the bottom of an excavated foundation, pouring a reinforced concrete bottom plate, wherein the thickness of the bottom plate is 15-30 cm, C20-C40 concrete is adopted, double-layer transverse and longitudinal steel bars are arranged, HRB400 steel bars can be adopted, the diameter phi is 14-18 mm, the distance is 200-400 mm, the outer transverse steel bars are bent by 90 degrees and extend into a reinforced concrete side plate to be not less than 100cm, and the outer transverse steel bars are connected with the vertical steel bars of the side plate in the later period and are mechanically connected by sleeves;
(3) when binding the reinforcing steel bars of the bottom plate, embedding the pull rod reinforcing steel bars anchored in the bottom plate, arranging 90-degree hooks at the end parts of the pull rod reinforcing steel bars, wherein the length of each hook is 15-30 cm, and welding the hook with the transverse reinforcing steel bars of the bottom plate;
(4) paving a bottom broken stone drainage layer on the upper part of the bottom plate, wherein the nominal particle size is 2-4 cm, and the thickness is 10-20 cm;
(5) erecting a vertical template, pouring a reinforced concrete baffle, wherein the thickness of a single plate is 30-50 cm, C20-C40 concrete is adopted, double rows of horizontal and vertical steel bars are arranged, HRB400 steel bars can be adopted, the diameter phi is 14-18 mm, the distance is 200-400 mm, and the vertical steel bars are welded with reserved transverse steel bars in a reinforced concrete bottom plate or mechanically connected with sleeves;
(6) the pull rod reinforcing steel bars are divided into pull rod reinforcing steel bars anchored in the bottom plate and pull rod reinforcing steel bars anchored in the original roadbed, HRB400 reinforcing steel bars can be adopted, the diameter phi of the HRB400 reinforcing steel bars is 22-36, the HRB400 reinforcing steel bars can be lengthened in sections so as to facilitate construction, the lengthened portions are mechanically connected through sleeve threads, and straight threads are pre-machined at the top of each pull rod according to the type of a matched nut;
(7) the pull rod steel bars anchored in the bottom plate are embedded and anchored in the bottom plate when the reinforced concrete bottom plate is poured;
(8) firstly, drilling holes downwards at the original roadbed step and the top surface overexcavation section, wherein the hole diameter is 90-110 mm, the depth is 300-800 cm, M30 cement mortar is poured into the holes for anchoring after the tie bars are inserted, and the anchoring force of the tie bars is not less than 1.5 times of the prestress;
(9) an EPS foam plastic block is filled in the expanded roadbed range between the reinforced concrete baffle and the original roadbed, and the EPS foam plastic block can be perforated at the position of the pull rod reinforcing steel bar;
(10) the EPS plastic foam block body is filled with a certain additional height delta h, the block body is guaranteed to reach the designed elevation of the road surface after being compressed after prestressing, and the additional height delta h can be calculated according to the following formula:
in the formula: f. ofp-prestressing (KPa)
The stress generated by the pavement structure layer and the bearing plate above the top surface of the P-EPS foam plastic block can be calculated according to the thickness and the volume weight of the pavement structure layer and the bearing plate to obtain (KPa)
E-EPS foam block modulus of elasticity, obtained by the manufacturer or by compression test (KPa)
H-roadbed filling height, considering the difference (cm) caused by road surface cross slope
The gamma-coefficient can be 1.1-1.2
The added height delta h can be only calculated at the maximum height of the edge of the roadbed, and then the lapping position of the added height delta h and the original roadbed is taken as 0, and a simple and convenient method for interpolation calculation of the middle part is adopted;
(11) pouring a reinforced concrete bearing plate on the top of the EPS foam plastic block, wherein C20-C40 concrete can be adopted, the thickness is 20-40 cm, double layers of transverse and longitudinal reinforcing bars are arranged, the diameter of the reinforcing bar is 14-20 mm, the distance is 100-200 mm, holes with the diameter of 30-50 mm are reserved at the reinforcing bar of the pull rod, the reinforcing bar of the pull rod can conveniently penetrate through the holes, a steel base plate with the diameter of 30cm multiplied by 30cm is reserved on the top, and the depth of the grooves is 6-10 cm;
(12) when the strength of the reinforced concrete reaches over 70 percent of the designed strength, the prestressed concrete can be prestressed, a steel backing plate with the thickness of 20cm multiplied by 20cm is installed, and a jack is utilized to apply prestress NpAnd locking by using a nut, fixing by spot welding, and pouring hot-melt rubber (such as EVA hot-melt adhesive) in the groove for filling and sealing.
Applying a prestress NpCan be calculated according to the following formula:
Np＝α(P+fp)Ac
in the formula: n is a radical ofp-applying a pre-stressing value (KN)
NkMaximum combination of pressures (KN) of a standard vehicle load on a monolithic carrier plate according to Standard road engineering (JTG B01)
B-calculating the width, 2.5m (m) of standard vehicle load of level I road in road engineering Standard (JTG B01)
L-calculating the Length, distance between expansion joints of reinforced concrete slab (m)
AcArea of membership (m) of a single tie bar2)
α -coefficient, 1.2-1.3
(13) After the EPS roadbed widening construction is finished, paving operation of a pavement structure layer is carried out on the surface.
The specific embodiment is as follows:
the implementation case is an expressway, the load grade is a grade I highway, the original roadbed height is 6.0m, the outside terrain is flat, the slope rate of the original roadbed side slope is 1:1.5, the thickness of a pavement structure layer is 75cm, and the comprehensive unit weight is 23.0KN/m3Preferably, the EPS foam plastic block is selected, all technical indexes meet the requirements of relevant standards, and the elastic modulus E is 3200 KPa.
1. The method comprises the steps of clearing the surface of an original roadbed side slope, excavating original framework protection and surface layer planting soil, excavating steps, wherein the width of each step is 150cm, the height of each step is 100cm, excavating grades are 4, the top of each step is 150cm towards the inside of an original roadbed top, and the thickness of a reinforced concrete bearing plate is 30 cm.
2. And excavating a foundation pit at the bottom of the excavated foundation, wherein the depth of the foundation pit is 20cm, binding reinforcing steel bars and pull rod reinforcing steel bars anchored in the bottom plate, pouring a reinforced concrete bottom plate, and adopting C30 concrete, wherein the thickness of the bottom plate is 20 cm.
3. The bottom plate reinforcing steel bar adopts HRB400 reinforcing steel bar, and double-deck horizontal, longitudinal reinforcement arranges, and lower floor's reinforcing steel bar diameter phi 16mm, horizontal, longitudinal spacing 200mm, upper strata reinforcing steel bar diameter phi 14mm, horizontal, longitudinal spacing 400mm, protective layer thickness 7mm, outside bending 90, crotch length 100cm, bent section reinforcing steel bar interval 26 cm.
4. The pull rod steel bars pre-embedded and anchored in the reinforced concrete bottom plate are made of HRB steel bars, the diameter phi of the HRB steel bars is 28mm, the end parts of the pull rod steel bars are provided with 90-degree hooks, the length of the pull rod steel bars is 25cm, the pull rod steel bars are welded with the bottom transverse steel bars, the length of a first section of each pull rod steel bar is 100cm, and the non-bending end of each pull rod steel.
5. Binding horizontal and vertical steel bars of the vertical reinforced concrete baffle, welding the bottom of the vertical steel bar with the transverse bent steel bar in the reinforced concrete bottom plate, erecting a template, and pouring concrete for maintenance.
6. The reinforced concrete side plate is 40cm in thickness, C30 concrete is adopted, double rows of horizontal and vertical steel bars are arranged, HRB400 steel bars are adopted, the diameter phi is 16mm, and the distance is 200 mm.
7. A row of drainage holes with the diameter of 50mm and the distance of 200cm are reserved at the bottom of the reinforced concrete baffle.
8. The tie bar reinforcing steel bars are divided into three parts, namely tie bar reinforcing steel bars anchored in a reinforced concrete bottom plate, anchored in an original roadbed excavation step and anchored in an original roadbed top surface overexcavation section, and the tie bar reinforcing steel bars anchored in the reinforced concrete bottom plate are pre-embedded; and (3) firstly, drilling holes downwards in the steps and the top super-excavation section according to the arrangement condition of the pull rod steel bars, wherein the hole diameter is 110mm, the depth is 600cm, M30 cement mortar is poured into the holes after the pull rod steel bars are inserted for anchoring, and the next construction is carried out after the anchoring force is detected to meet the design requirement.
9. The pull rod reinforcing steel bars are HRB400 reinforcing steel bars, the diameter phi is 28mm, the pull rod reinforcing steel bars are arranged in a square mode, the distance between each two adjacent pull rod reinforcing steel bars is 1.5m, the distance from the outermost pull rod reinforcing steel bar to the edge of the outermost pull rod reinforcing steel bar is not more than 0.75m, the length of each pull rod reinforcing steel bar is reserved to be 1m so as to facilitate building block construction, and the end portions of.
10. And paving a broken stone cushion layer on the base reinforced concrete bottom plate, wherein broken stones with the nominal particle size of 2-4 cm and the thickness of 15cm are adopted.
11. And EPS foam plastic blocks are filled in the expanded roadbed range between the reinforced concrete baffle and the original roadbed, the tie bar reinforcing steel bars can be perforated on the EPS foam plastic blocks, and then the EPS is filled, and sleeves are adopted to lengthen the tie bar reinforcing steel bars.
And 12, a certain additional height delta h is reserved for filling the EPS plastic foam block, and the block is ensured to reach the designed elevation of the pavement after being compressed after prestressing.
13. Pouring a reinforced concrete bearing plate on the top of the EPS foam plastic block, adopting C30 concrete, the thickness of the bearing plate is 30cm, double-layer transverse and longitudinal reinforcing bars are arranged, the reinforcing bars adopt HRB400, the diameter phi of the reinforcing bars is 16mm, the distance between the reinforcing bars is 120mm, the thickness of the lower layer reinforcing bar protective layer is 7mm, the thickness of the upper layer reinforcing bar protective layer is 80mm, holes with the phi of 50mm are arranged at the positions of the tie bar reinforcing bars, the tie bar reinforcing bars can conveniently penetrate through the holes, square grooves with the depth of 7cm are reserved on;
14. when the strength of the reinforced concrete reaches over 70 percent of the designed strength, the prestressed concrete can be prestressed, a steel backing plate with the thickness of 20cm multiplied by 20cm is installed, and a jack is utilized to apply prestress NpAnd locking by using a nut, fixing by spot welding, and pouring EVA hot-melt rubber in the groove for filling and sealing.
And 15, after the EPS roadbed widening construction is finished, paving the pavement structure layer on the surface.
In the embodiment, the values of the main technical parameters are as follows:
1) the longitudinal expansion joint distance L of the reinforced concrete bearing plate at the top is 10m, and the load N is based on the standard vehicle load of the level I of the highway in the technical Standard of Highway engineering (JTGB01)kThe maximum value is 520KN, and the calculated width B is 2.5m in the most unfavorable condition. Calculating the prestress fpIs 20.8 KPa;
2) the thickness of the reinforced concrete top plate is 30cm, and the unit weight is 25KN/m3The thickness of the pavement structure layer is 75cm, and the comprehensive volume weight is 23KN/m3The load P above the top surface of the EPS foam block is 24.8 KPa.
3) Preferably, the elasticity modulus of the EPS foam plastic block is 3200KPa, the height of the roadbed is 6.0m, the thickness H of the deducting pavement structure layer and the reinforced concrete bearing plate is 495cm, the gamma coefficient is 1.2, and the calculated additional height delta H is 8.6 cm.
4) The tie bar steel bars are arranged in a square mode, the distance is 1.5m, the dependent area Ac is 2.25m2, the coefficient of α is 1.25, and the prestress N is calculatedpIs 128.3KN
5) The design value of the anchoring force of the pull rod steel bar anchored in the original roadbed excavation step and the overexcavation section of the top surface of the original roadbed is 1.5Np192.4 KN.
Claims (6)
1. The utility model provides a structure is widened to prestressing force type EPS road bed which characterized in that: the novel road bed comprises a plurality of steps, a reinforced concrete bottom plate is arranged at the bottom of a newly-widened road bed, a broken stone drainage layer is laid on the reinforced concrete bottom plate, reinforced concrete baffles are arranged on the side face of the newly-widened road bed, EPS foam plastic blocks are laid on the broken stone drainage layer and the steps of the original road bed, a reinforced concrete bearing plate is arranged at the top of each EPS foam plastic block, pull rod steel bars are respectively anchored in the reinforced concrete bottom plate, in each step of the original road bed and in the original road bed adjacent to the step, the pull rod steel bars penetrate out of the EPS foam plastic blocks and the reinforced concrete bearing plate, nuts are screwed on the pull rod steel bars to pre-stress the steel base plate sleeves, and a pavement structure layer.
2. The pre-stressed EPS roadbed widening structure of claim 1, wherein: the number of steps arranged on the original roadbed is 2-8, and the width of each step is 100-200 cm.
3. The pre-stressed EPS roadbed widening structure of claim 1, wherein: the reinforced concrete bottom plate is 15-30 cm thick.
4. The pre-stressed EPS roadbed widening structure of claim 1, wherein: the thickness of the gravel drainage layer is 10-20 cm, and the particle size of gravel is 2-4 cm.
5. The pre-stressed EPS roadbed widening structure of claim 1, wherein: the thickness of the reinforced concrete baffle is 30-50 cm.
6. The pre-stressed EPS roadbed widening structure of claim 1, wherein: the thickness of the reinforced concrete bearing plate is 20-40 cm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110106758A (en) * | 2019-04-15 | 2019-08-09 | 湖北省交通规划设计院股份有限公司 | A kind of prestress type EPS roadbed widening structure and construction method |
| CN112501973A (en) * | 2020-12-21 | 2021-03-16 | 江苏金贸科技发展有限公司 | Concrete precast block for repairing cement road |
| CN113201985A (en) * | 2021-04-06 | 2021-08-03 | 中铁大桥勘测设计院集团有限公司 | Transition section connection structure at junction of tunnel roadbed and highway roadbed |
-
2019
- 2019-04-15 CN CN201920510864.6U patent/CN210315101U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110106758A (en) * | 2019-04-15 | 2019-08-09 | 湖北省交通规划设计院股份有限公司 | A kind of prestress type EPS roadbed widening structure and construction method |
| CN112501973A (en) * | 2020-12-21 | 2021-03-16 | 江苏金贸科技发展有限公司 | Concrete precast block for repairing cement road |
| CN113201985A (en) * | 2021-04-06 | 2021-08-03 | 中铁大桥勘测设计院集团有限公司 | Transition section connection structure at junction of tunnel roadbed and highway roadbed |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |