Embankment deformation self-adaptive ventilation plate roadbed structure and design method thereof

Abstract

The invention relates to an embankment deformation self-adaptive ventilation plate roadbed structure and a design method thereof. The structure sequentially comprises a roadbed, a chain type hollow plate and a pavement base layer from bottom to top, the chain type hollow slabs are transversely arranged and are longitudinally and tightly arranged in parallel, and transverse chain type hollow slab ventilation holes are formed in the chain type hollow slabs; the two longitudinal splicing end faces of each chain type hollow slab are provided with a longitudinal cylindrical groove and a longitudinal force transmission steel bar respectively, and when every two longitudinal adjacent chain type hollow slabs are spliced, the force transmission steel bar at one end is inserted into the cylindrical groove at the other end, so that the two longitudinal adjacent chain type hollow slabs are connected with each other. After the structure is operated, when the embankment sinks in a small range, certain flexural rigidity can be provided in the longitudinal direction, subsidence is spanned, and the pavement flatness is guaranteed; when the embankment sinks in a large range, the connecting steel bars are yielded, certain rotation and longitudinal deformation can be provided to adapt to the large-range sinking, the problem that the road surface is uneven due to the settlement of the road in the frozen soil area is solved, and huge economic benefits and social values are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed construction, and in particular to an embankment deformation self-adaptive ventilation plate roadbed structure and a design method thereof. Background Art

[0002] After the expressways in permafrost areas were put into operation, the "heat blanket effect" produced by the wide black pavement and the "heat accumulation effect" of the large-scale roadbed made the "heat flow basin" effect of the permafrost beneath the roadbed more significant. The stability problem of expressways in permafrost areas with high temperature and high ice content still needs to be further solved. In recent years, roadbed and pavement diseases have frequently occurred in highway projects built in permafrost areas. For large-scale settlements over long distances and small curvatures, the danger to driving safety is relatively small, but for small-scale road subsidence and potholes, it will seriously affect driving safety.

[0003] In order to reduce the damage of thermal melting to the roadbed structure, new heat dissipation roadbed and pavement are currently used to alleviate the "heat flow basin" effect of permafrost by heat dissipation. However, most of the existing heat dissipation roadbed and pavement have problems such as inability to adapt to the deformation of the original foundation, easy to sink, complex construction, more materials, and relatively high cost.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a roadbed deformation adaptive ventilation plate roadbed structure and a design method thereof, so as to at least solve the problem that the existing heat dissipation roadbed pavement cannot adapt to the deformation of the original foundation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The embankment deformation self-adaptive ventilation plate roadbed structure comprises a roadbed, a chain hollow plate and a road surface base from bottom to top;

[0008] The chain hollow plates are arranged transversely and parallelly and closely in the longitudinal direction, and transverse chain hollow plate ventilation holes are arranged in the chain hollow plates;

[0009] The two longitudinal splicing end faces of the chain hollow plate are respectively provided with longitudinal cylindrical grooves and longitudinal force-transmitting steel bars. When two longitudinally adjacent chain hollow plates are spliced ​​together, the force-transmitting steel bars at one end are inserted into the cylindrical groove at the other end, thereby connecting them to each other.

[0010] Furthermore, a flexible filling material is provided between two longitudinally adjacent chain-type hollow plates.

[0011] Furthermore, longitudinally arranged stirrups are provided at the cylindrical grooves and the force-transmitting steel bars in the chain-type hollow slab;

[0012] Vertical reinforcing steel bars are arranged inside the cylindrical groove or the force-transmitting steel bars, and the reinforcing steel bars are tied to the stirrups.

[0013] Furthermore, the cylindrical groove in the chain-type hollow plate and the bottom of the force-transmitting steel bar are provided with transversely arranged full-length steel bars.

[0014] Furthermore, a cylindrical embedded steel plate is provided on the inner wall of the cylindrical groove.

[0015] Furthermore, the cylindrical groove and the force-transmitting steel bars are arranged centrally or staggered up and down at both ends of the chain-type hollow slab.

[0016] Furthermore, the cylindrical grooves and the force-transmitting steel bars are provided in one or two groups at both ends of the chain-type hollow slab.

[0017] Furthermore, the cylindrical groove is filled with bonding material.

[0018] On the other hand, a design method for an embankment deformation adaptive ventilation plate roadbed structure is provided, the method including a chain hollow plate design, specifically including:

[0019] Determine the load distribution width perpendicular to the span direction of the plate, establish a finite element calculation model, calculate the maximum mid-span bending moment under the vehicle load, and then calculate the mid-span bending moment and the lateral combined internal force of the road under the lateral deadweight of the road;

[0020] Determine the reinforcement inside the chain hollow slab based on the transverse combined internal force of the road.

[0021] On the other hand, a design method of an embankment deformation adaptive ventilation plate roadbed structure is provided, the method comprising a connector design, including:

[0022] The connecting member includes a cylindrical groove and a force-transmitting steel bar;

[0023] According to the bridge deck width and bridge span, the maximum bending moment in the span under the vehicle load and the maximum bending moment under the longitudinal deadweight of the road are calculated, and then the longitudinal combined internal force of the road is calculated;

[0024] The resistance of the force-transmitting steel bars is calculated based on the yield strength, the sum of the areas, and the distance between the upper and lower centers of the force-transmitting steel bars;

[0025] Determine the relevant parameters of the force-transfer reinforcement based on the assumption that the longitudinal combined internal force of the road is not greater than the resistance of the force-transfer reinforcement.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention provides an embankment deformation adaptive ventilation plate roadbed structure and a design method thereof. When the embankment sinks in a small range, a certain bending stiffness can be provided longitudinally to cross the sinking and ensure the flatness of the road surface. When the embankment sinks in a large range, the connecting steel bars yield and can provide a certain rotation and longitudinal deformation to adapt to the large-scale sinking. In addition, the embankment deformation adaptive ventilation plate roadbed structure of the present invention solves the problem of uneven road surface caused by the settlement of large-section and high-grade roads such as highways in frozen soil areas, and has huge economic benefits and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a schematic cross-sectional view of hollow plate type 1 in Example 1 of the present invention.

[0031] Figure 3 This is a schematic diagram of the connection section of the hollow plate type 1 in Example 1 of the present invention.

[0032] Figure 4 It is a schematic cross-sectional view of hollow plate type 2 in embodiment 2 of the present invention.

[0033] Figure 5 This is a schematic diagram of the connection section of the hollow plate type 2 in Example 2 of the present invention.

[0034] Figure 6 It is a schematic cross-sectional view of hollow plate type 3 in embodiment 3 of the present invention.

[0035] Figure 7 This is a schematic diagram of the connection section of the hollow plate type 3 in Example 3 of the present invention.

[0036] Figure 8 It is a schematic cross-sectional view of hollow plate type 4 in embodiment 4 of the present invention.

[0037] Fig. 9 This is a schematic diagram of the connection section of hollow plate type 4 in embodiment 4 of the present invention.

[0038] Fig.10 This is a schematic diagram of the connection of hollow slab types 1 and 2 of the present invention.

[0039] Fig.11 This is a schematic diagram of the connection of hollow slab types 3 and 4 of the present invention.

[0040] Fig.12 It is a schematic diagram of the large sample of the connecting piece of the present invention.

[0041] The symbols in the figure are:

[0042] 1-roadbed, 2-chain hollow slab, 3-pavement base, 4-cylindrical groove, 5-force-transmitting steel bars, 6-embedded steel plates, 7-reinforcement steel bars, 8-hoops, 9-through-length steel bars, 10-bonding material, 11-flexible filling material, 12-upper layer of cow-hair felt, 13-lower layer of cow-hair felt, 14-ventilation holes of chain hollow slab. DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0044] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "longitudinal", "lateral", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0047] In a specific implementation manner, the line direction is defined as the longitudinal direction, and the direction perpendicular to the line direction is defined as the transverse direction, and all descriptions are consistent with this.

[0048] Currently, most existing frozen soil ventilation roadbeds are rigid structures that cannot adapt to foundation deformation. When the foundation deforms, it is easy to sink, cause diseases, and affect driving safety. The present invention provides an embankment deformation adaptive ventilation plate roadbed structure, in which special connectors are designed, which has a certain longitudinal bending rigidity and can even provide a certain rotation and longitudinal deformation to adapt to foundation deformation.

[0049] Specifically, Figure 1 The structure is composed of a roadbed 1, a chain hollow slab 2 and a road base 3 from bottom to top. The chain hollow slab 2 is a single-layer hollow slab structure, which is arranged horizontally and in parallel and closely arranged vertically. The chain hollow slab 2 is provided with horizontal chain hollow slab ventilation holes 14 to ensure heat dissipation of the roadbed and reduce the depth of frozen soil thawing. The length of the chain hollow slab 2 is slightly smaller than the width of the roadbed 1, and the full width is laid on the roadbed 1 horizontally.

[0050] The chain hollow slab 2 is arranged in a single layer and is spliced ​​longitudinally. The chain hollow slab 2 has a connector for realizing longitudinal vertical splicing, namely, longitudinal cylindrical grooves 4 and longitudinal force-transmitting steel bars 5 respectively arranged on the two longitudinal splicing end faces of the chain hollow slab 2, which can provide shear bearing capacity and a certain longitudinal displacement. Half of the force-transmitting steel bars 5 are prefabricated in the chain hollow slab 2, and the other half is exposed to the outside. The exposed part of the force-transmitting steel bars 5 is painted with anti-rust paint. When two longitudinally adjacent chain hollow slabs 2 are spliced ​​with each other, the force-transmitting steel bars 5 at one end are inserted into the cylindrical groove 4 at the other end, connected to each other, and the longitudinal extension is completed.

[0051] A gap is left between two longitudinally adjacent chain hollow plates 2, and a flexible filling material 11 is provided to avoid direct rigid contact between the chain hollow plates 2 and to allow the spacing between the two chain hollow plates 2 to have a certain variation range to achieve a good deformation effect.

[0052] In order to strengthen the plate body strength at the connection part, the present invention sets a special reinforcing rib combination at the connection part of the chain hollow slab 2. Specifically, longitudinally arranged stirrups 8 are set at the cylindrical grooves 4 and the force transmission steel bars 5 in the chain hollow slab 2, and vertical reinforcing steel bars 7 are set inside the cylindrical grooves 4 or the force transmission steel bars 5, and the reinforcing steel bars 7 are tied to the stirrups 8. In addition, transversely arranged full-length steel bars 9 are also set at the bottom of the cylindrical grooves 4 and the force transmission steel bars 5 in the chain hollow slab 2.

[0053] In order to improve the strength of the cylindrical groove 4, a cylindrical embedded steel plate 6 can also be arranged on the inner wall of the cylindrical groove 4. When the roadbed is bent longitudinally to adapt to the deformation of the foundation, the chain hollow plate 2 can be effectively protected from damage.

[0054] The connecting parts have different types of settings. The cylindrical grooves 4 and the force-transmitting steel bars 5 can be arranged in the center or staggered up and down at both ends of the chain hollow slab 2. The cylindrical grooves 4 and the force-transmitting steel bars 5 can be arranged in one group or two groups at both ends of the chain hollow slab 2. Specifically, the following types of hollow slabs 3 are included:

[0055] Embodiment 1:

[0056] like Figure 2 and Figure 3 This embodiment is type 1, the cylindrical groove 4 and the force transmission steel bar 5 are arranged centrally at both ends of the chain hollow plate 2, and a group is set, and no embedded steel plate 6 is set in the cylindrical groove 4.

[0057] When the chain hollow slabs 2 are longitudinally spliced, the force transmission steel bars 5 of one of the chain hollow slabs 2 are inserted into the cylindrical grooves 4 of the other chain hollow slab 2 .

[0058] Embodiment 2:

[0059] like Figure 4 and Figure 5 This embodiment is type 2, the cylindrical groove 4 and the force transmission steel bar 5 are arranged in an up-and-down staggered manner at both ends of the chain hollow plate 2, and two groups are provided, and no embedded steel plate 6 is provided in the cylindrical groove 4.

[0060] When the chain hollow slabs 2 are longitudinally spliced, the force transmission steel bars 5 of the first chain hollow slab 2 are inserted into the cylindrical grooves 4 of the second chain hollow slab 2, and at the same time, the force transmission steel bars 5 of the second chain hollow slab 2 are inserted into the cylindrical grooves 4 of the first chain hollow slab 2.

[0061] Embodiment 3:

[0062] like Figure 6 and Figure 7 This embodiment is type 3, the cylindrical groove 4 and the force transmission steel bar 5 are arranged centrally at both ends of the chain hollow plate 2, and a group is set, and an embedded steel plate 6 is set in the cylindrical groove 4.

[0063] When the chain hollow slabs 2 are longitudinally spliced, the force transmission steel bars 5 of one of the chain hollow slabs 2 are inserted into the cylindrical grooves 4 of the other chain hollow slab 2 .

[0064] Embodiment 4:

[0065] like Figure 8 and Fig. 9 This embodiment is type 4, the cylindrical groove 4 and the force transmission steel bar 5 are arranged in an up-and-down staggered manner at both ends of the chain hollow plate 2, and two groups are provided, and an embedded steel plate 6 is provided in the cylindrical groove 4.

[0066] When the chain hollow slabs 2 are longitudinally spliced, the force transmission steel bars 5 of the first chain hollow slab 2 are inserted into the cylindrical grooves 4 of the second chain hollow slab 2, and at the same time, the force transmission steel bars 5 of the second chain hollow slab 2 are inserted into the cylindrical grooves 4 of the first chain hollow slab 2.

[0067] In the above-mentioned embodiments 1 and 2, before the force transmission steel bar 5 is inserted into the cylindrical groove 4, a bonding material 10 can be poured into the cylindrical groove 4, so that the force transmission steel bar 5 can be bonded to each other after insertion. Fig.10 In the third and fourth embodiments, the cylindrical groove 4 may not be filled with the cementing material 10. Fig.11 Of course, the bonding connection and the telescopic connection can also be used in combination, with a row of longitudinal telescopic connections set at a certain interval to meet the structural integrity while allowing the structure to adapt to a certain deformation.

[0068] In the same chain hollow slab 2, type 1 and type 2 can be used together. In the same chain hollow slab 2, type 2 can be used alone, but type 1 cannot be used alone.

[0069] In other embodiments, the top surface of the roadbed 1 and the top surface of the chain hollow slab 2 are also paved with an upper layer of cow hair felt 12 and a lower layer of cow hair felt 13, which can achieve the effects of ventilation, heat preservation and shock absorption.

[0070] A plurality of connecting pieces are evenly arranged at both ends of the chain hollow slab 2 in the horizontal direction. After the adjacent chain hollow slabs 2 are longitudinally spliced, the following is achieved: Fig.12 When a small-scale subsidence occurs on the embankment, the present invention can provide a certain bending stiffness in the longitudinal direction to overcome the subsidence and ensure the flatness of the road surface. When a large-scale subsidence occurs on the embankment, the force-transmitting steel bars 5 in the present invention yield and can provide a certain rotation and longitudinal deformation to adapt to the large-scale subsidence.

[0071] The construction method of the embankment deformation adaptive ventilation plate roadbed structure specifically includes the following steps:

[0072] S1: Design the chain hollow slab 2 according to the parameters such as roadbed width, height, road grade, etc.;

[0073] S2: prefabricated chain hollow slab 2, transported to the construction site;

[0074] S3: constructing a roadbed 1, and laying a lower layer of cow hair felt 13 on the roadbed 1;

[0075] S4: Pre-assemble the end chain hollow slab 2 at the designed position of the lower embankment. For Type 1 and Type 2, after the pre-assembly is correct, pour the bonding material 10 into the cylindrical groove 4, and then insert the force-transmitting steel bar 5 into the groove. After the bonding material 10 hardens, construct the flexible filling material 9 at the plate joint; for Type 3 and Type 4, after the pre-assembly is correct, directly insert the force-transmitting steel bar 5 into the cylindrical groove 4, and then construct the flexible filling material 9 at the plate joint.

[0076] S5: Lay the upper layer of cowhide felt 12 and construct the road surface base 3.

[0077] In addition, the present invention also provides a design method for an embankment deformation adaptive ventilation plate roadbed structure, which specifically includes the following steps:

[0078] S1: In the transverse direction of the road, the prefabricated hollow slab 2 is designed according to the width of the roadbed. The transverse load of the road is borne by the prefabricated hollow slab 2, and the design principle is that the hollow slab can withstand potholes with a maximum width of the roadbed width. According to the span of the roadbed width L, the load is the most unfavorable value of the upper load evenly distributed within the width of a plate, and the support condition is simply supported at the plate end, the prefabricated hollow slab 2 is designed in the plate length direction. This step can be more safe to ensure that the ventilation plate roadbed mechanism will not be damaged along the transverse direction of the road surface. Specifically include:

[0079] S101: Finite element modeling to calculate the maximum mid-span bending moment M of a 1m wide simply supported slat under vehicle load op1 , the model needs to consider the wheel load distribution width a, that is, the effective calculation width of the plate perpendicular to the plate span direction.

[0080] When a single wheel acts on the middle of the plate span:

[0081]

[0082] When multiple identical wheels are in the middle of the span of the plate, and the wheels overlap within the distribution width calculated for a single wheel:

[0083]

[0084] When the wheel is on the support of the plate:

[0085] a=(a1+2h)+t

[0086] in:

[0087] a1 is the wheel contact dimension perpendicular to the board span direction;

[0088] t is the mid-span thickness of the plate;

[0089] h is the pavement thickness;

[0090] d is the center distance of the wheels when multiple wheels act within the distribution width.

[0091] S102: Calculate the maximum bending moment M under the lateral deadweight of the road og1 :

[0092]

[0093] in:

[0094] g1 is the transverse linear weight of the hollow slab and the road structure above it within the effective distribution width.

[0095] S103: Calculate the combined lateral internal force M of the road ud1 :

[0096] M ud1 =1.2M og1 +1.8M op1

[0097] The calculation of resistance M is the same as that of conventional hollow slabs, and the hollow slabs can be designed according to the conventional bearing capacity limit state.

[0098] S2: In the longitudinal direction of the road, the minimum acceptable diameter of the embankment settlement area D is assumed considering the underlying soil conditions, load and traffic conditions, etc. When the diameter of the roadbed settlement area is less than D, the load on the roadbed is borne by the hollow slab and the connecting parts of the force-transmitting steel bars. When the roadbed settlement diameter is greater than D, it is considered that the settlement curvature is small and has little impact on driving. Within the acceptable range for driving, the force-transmitting steel bars of this structure yield to adapt to the settlement deformation.

[0099] S3: Design connector type 2 according to the minimum acceptable diameter D of the embankment settlement area. In the longitudinal direction of the road, the load is borne by the connector, and the hollow slab bearing capacity requirement is not less than the connector bearing capacity. According to the span D, the load is the most unfavorable value of the longitudinal upper load borne by the roadbed, and the support condition is simply supported at the beam end. The most unfavorable bending moment and shear force are obtained. According to the most unfavorable internal force, the type 2 force transmission steel bar 5 and reinforcing steel bar 7, stirrups 8, and full-length steel bar 9 are designed, as well as the hollow slab width direction design. Specifically include:

[0100] S301: The span is the assumed diameter of the subsidence area D, the beam width is the roadbed width, and the beam end is simply supported. According to the principle of the most unfavorable arrangement of lane loads within the span D, calculate the maximum bending moment M under the lane load op2 :

[0101]

[0102] in:

[0103] n is the number of lanes;

[0104] γ is the lane reduction coefficient;

[0105] μ is the impact coefficient;

[0106] q k is the standard value of uniformly distributed load on the lane;

[0107] P k is the standard value of lane concentrated load;

[0108] S302: Calculate the maximum bending moment M under the longitudinal deadweight of the road og2 :

[0109]

[0110] in:

[0111] g2 is the longitudinal linear weight of the hollow slab and the road structure above it within the effective distribution width.

[0112] S303: Calculate the longitudinal combined internal force M of the road ud2 :

[0113] M ud2 =1.2M og2 +1.4M op2

[0114] S304: Calculate the resistance M of the connector k :

[0115] M k =f y A s d0

[0116] in:

[0117] f y The yield strength of type 2 force transmission reinforcement 5;

[0118] A s is the sum of the areas of type 2 force-transmitting reinforcement 5 (when force-transmitting reinforcement 5 is ordinary ribbed reinforcement, A s =nπD 钢筋 2 / 4, n is the number of steel bars arranged horizontally, D 钢筋 is the diameter of the force transmission steel bar 5);

[0119] d0 is the center distance between the upper and lower force transmission steel bars 5 of type 2.

[0120] According to M k ≥Mud2, determine the design parameters of force transmission reinforcement 5.

[0121] S4: According to the calculation results of S3, design the horizontal arrangement of connector type 1 and type 2. It is recommended that the same spacing be used for the connectors of the same project, with type 2 being the main load-bearing device and type 1 being the structural ductility guarantee device.

[0122] S5: Design the longitudinal retractable connection spacing. Considering factors such as local temperature and acceptable embankment settlement D, a row of non-grouting connectors is set at each interval.

[0123] Taking the permafrost roadbed melting interlayer quality improvement project at a certain location on the G109 line of the Qinghai-Tibet Highway as an example, the present invention is specifically described:

[0124] The roadbed width of this section is 11.7m, with a two-way single lane and a road surface of 30cm thick gravel base + 30cm asphalt concrete. According to the ground temperature test results of the frozen soil profile, the melting interlayer section area A = 45m 2 ,

[0125] S1: Chain Hollow Slab 2 Design:

[0126] a1=0.2m

[0127] The load distribution width a perpendicular to the span direction of the plate is:

[0128]

[0129] According to the lateral distribution width of 9.2m, a hollow slab with C40 concrete, 60cm thickness, 40cm hole diameter and 60cm hole spacing was selected to establish a finite element calculation model. The maximum bending moment in the mid-span under vehicle load was calculated to be 94.1kN·m, and the bending moment in the mid-span under self-weight was 427.8kN·m.

[0130] M ud1 =1.2×M og1 +1.8×M op1 =1.2×427.8+1.8×94.1=682.7kN·m

[0131] S2: Assuming that the minimum acceptable diameter of the subsidence area is D=8m, for subsidence exceeding 8m, the connecting rod of the present invention yields, and the hollow slab adapts to the subsidence to form a relatively smooth pit with a gentle slope.

[0132] S3: Design the connectors based on the bridge deck width of 11.7m, bridge span of 8m, and simple support at the beam ends:

[0133]

[0134] The maximum bending moment under deadweight is:

[0135]

[0136] The combined internal force is:

[0137] M ud2 =1.2×1896+1.4×1335.6=4145.04kN·m

[0138] The resistance of the connector is:

[0139] M k =f y A s d0

[0140] According to the force transmission steel bar type 2, diameter 28mm, d0 = 500mm, the steel bar strength design value f y =250Mpa, then:

[0141]

[0142] n0=53.8

[0143] 54 groups of force transmission steel bars need to be set horizontally to meet the requirements. n0 is the number of steel bar groups, and the upper and lower steel bars are a group.

[0144] S4: According to the calculation results of S3, the spacing of force transmission steel bars is designed to be 150mm, the roadbed width is 11.7m, and a total of 78 groups of force transmission steel bars are arranged, including 60 groups of force transmission steel bars of type 2 and 18 groups of force transmission steel bars of type 1. It is sufficient to ensure that the actual number of force transmission steel bars of type 2 is greater than the number required by calculation. Force transmission steel bars of type 1 can be arranged in appropriate amounts to make the spacing of the connection structure more reasonable and to avoid interference between the connection steel bars and the original transverse steel bars of the hollow slab as much as possible.

[0145] S5: Considering factors such as local temperature and acceptable embankment settlement D, a row of non-grouting connectors is set every 30m, that is, 60 groups of force-transmitting steel bars of type 3 and 18 groups of force-transmitting steel bars of type 4 are arranged. The number of force-transmitting steel bars of type 3 is the same as that of type 2, except that type 3 is not grouted and has a pre-buried steel plate. Type 4 is the same as type 1.

[0146] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. The embankment deformation adaptive ventilation plate roadbed structure is characterized by: The structure comprises, from bottom to top, a roadbed (1), a chain hollow slab (2) and a road surface base (3); The chain-type hollow plates (2) are arranged transversely and are closely arranged in parallel longitudinally, and transverse chain-type hollow plate ventilation holes (14) are provided in the chain-type hollow plates (2); The two longitudinal splicing end faces of the chain-type hollow slab (2) are respectively provided with longitudinal cylindrical grooves (4) and longitudinal force-transmitting steel bars (5). When two longitudinally adjacent chain-type hollow slabs (2) are spliced ​​together, the force-transmitting steel bars (5) at one end are inserted into the cylindrical groove (4) at the other end, thereby connecting them to each other.

2. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized by: A flexible filling material (11) is arranged between two longitudinally adjacent chain-type hollow plates (2).

3. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized by: The cylindrical groove (4) and the force transmission steel bar (5) in the chain-type hollow plate (2) are provided with stirrups (8) arranged longitudinally; A vertical reinforcing steel bar (7) is arranged inside the cylindrical groove (4) or the force-transmitting steel bar (5), and the reinforcing steel bar (7) is tied to the stirrup (8).

4. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized in that: The cylindrical groove (4) in the chain-type hollow plate (2) and the bottom of the force-transmitting steel bar (5) are provided with transversely arranged full-length steel bars (9).

5. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized by: The inner wall of the cylindrical groove (4) is provided with a cylindrical embedded steel plate (6).

6. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized by: The cylindrical groove (4) and the force-transmitting steel bars (5) are arranged centrally or staggered up and down at both ends of the chain-type hollow slab (2).

7. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized by: The cylindrical grooves (4) and the force-transmitting steel bars (5) are arranged in one or two groups at both ends of the chain-type hollow slab (2).

8. The embankment deformation adaptive ventilation plate roadbed structure according to claim 1 is characterized by: The cylindrical groove (4) is filled with a bonding material (10).

9. A design method for an embankment deformation adaptive ventilation plate roadbed structure, characterized in that: The method comprises a chain hollow slab (2) design, specifically comprising: Determine the load distribution width perpendicular to the span direction of the plate, establish a finite element calculation model, calculate the maximum mid-span bending moment under the vehicle load, and then calculate the mid-span bending moment and the lateral combined internal force of the road under the lateral deadweight of the road; The reinforcement inside the chain hollow slab (2) is determined according to the combined transverse internal force of the road.

10. A design method for an embankment deformation adaptive ventilation plate roadbed structure, characterized in that: The method includes connector design, including: The connecting piece comprises a cylindrical groove (4) and a force transmission steel bar (5); According to the bridge deck width and bridge span, the maximum bending moment in the span under the vehicle load and the maximum bending moment under the longitudinal deadweight of the road are calculated, and then the longitudinal combined internal force of the road is calculated; The resistance of the force transmission reinforcement (5) is calculated based on the yield strength, the sum of the areas, and the distance between the upper and lower centers; Based on the fact that the longitudinal combined internal force of the road is not greater than the resistance of the force-transmitting reinforcement, the relevant parameters of the force-transmitting reinforcement (5) are determined.

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