CN219972832U - Connection structure of new and old roadbed - Google Patents

Abstract

The utility model discloses a joint structure of a new roadbed and an old roadbed, which comprises a new roadbed and the old roadbed, wherein a plurality of steps are arranged at the joint part of the old roadbed and the new roadbed, a multi-layer pavement structure is arranged in the new roadbed, the pavement structure is sequentially provided with a rubble layer, a first concrete layer, a sand cushion layer and a second concrete layer from bottom to top, a T-shaped reinforcing plate is connected between the first step surface and the second step surface of the steps, a plurality of lap joint frames are arranged on the T-shaped horizontal edge of the T-shaped reinforcing plate, the lap joint frames extend on one side of the new roadbed and comprise vertical rods which extend up and down on two sides, the vertical rods extend between adjacent pavement structures, the lap joint frames on the adjacent T-shaped horizontal edge form up-down staggered arrangement, and a grid is paved at the junction part between the multi-layer pavement structures, and the upper part of the grid is propped against the bottom of the T-shaped horizontal edge of the T-shaped reinforcing plate.

Description

Connection structure of new and old roadbed

Technical Field

The utility model relates to the technical field of braid processing equipment, in particular to a connection structure of new and old roadbed.

Background

At present, urban improvement in China is continuously advanced, and communication between cities is more frequent. In the context of the rapid development of national economy, the increase of transportation capacity is now the focus of attention. At present, there are several views for improving the highway transportation capability in China, namely, the road width is reduced on the existing highway, and the lanes are increased; secondly, a new expressway and a provincial highway are built, and traffic is split; thirdly, on the basis of the existing highway, the renewal, the expansion and the reconstruction are carried out. The third view has moderate economic benefit, fixed line and strong applicability, and can better promote the transportation capability. The treatment of the joint positions of the new roadbed and the old roadbed becomes a weak link of quality control in highway construction, and the overall safety of the roadbed and the pavement structure has great potential hazards. If the joint between the new roadbed and the old roadbed is poor, longitudinal cracks are possibly caused by the non-uniformity of the settlement of the new roadbed and the old roadbed, even the defects of instability of the widened roadbed, road surface damage, reduced road surface structural property and overall performance and the like are caused, and the cracks between the new roadbed and the old roadbed are more easily aggravated under different temperature conditions due to different expansion coefficients of materials. Aiming at the defects existing in the prior art, a connecting structure suitable for construction of new and old roadbeds needs to be designed, so that the problem of longitudinal cracks caused by uneven settlement of the new and old roadbeds is solved.

Disclosure of Invention

To achieve the above object, the present utility model is achieved by: the utility model provides a link up structure of new and old road bed, includes new road bed and old road bed, old road bed with the link up department of new road bed is provided with a plurality of steps new road bed is located to correspond the step side has multilayer road surface structure, road surface structure from down supreme setting gradually is rubble layer, first concrete layer, sand bed course and the second concrete layer, the step includes first step face and second step face, a plurality of be connected with T type reinforcing plate between the first step face of step and the second step face, every T type reinforcing plate, including T type horizontal limit and T type vertical limit, every T type horizontal limit is equipped with a plurality of overlap joint shelves, and is a plurality of the overlap joint shelf extends new road bed one side, the overlap joint shelf includes the vertical pole that both sides extend from top to bottom, the vertical pole upper and lower both sides extend between adjacent road surface structure, and in adjacent a plurality of T type horizontal limit overlap joint shelf forms up-down arrangement, the multilayer between the road surface structure the department has the grid to lay the horizontal limit of T type and is in the bottom of T type reinforcing plate is in the juncture of T type horizontal limit.

Further, a rubber buffer strip is further arranged at the abutting part between the second step surface and the T-shaped reinforcing plate. By arranging the rubber buffer strips, under different cold and hot conditions, the new roadbed and the old roadbed are regulated due to different cold and hot shrinkage, so that gaps between the new roadbed and the old roadbed can be reduced, and faults between the new roadbed and the old roadbed are avoided.

Further, a sinking groove is formed in the side, connected with the new roadbed, of the old roadbed, and the height of the sinking groove is consistent with the thickness of the T-shaped horizontal edge. Therefore, the T-shaped reinforcing plate positioned at the upper part is clamped in the sinking groove through the T-shaped horizontal edge, so that the T-shaped horizontal edge is kept flush with the road surface of the old roadbed.

Further, the T-shaped reinforcing plate is provided with a fixing hole on the side edge of the T-shaped horizontal edge, a connecting nail is arranged in the fixing hole, and the connecting nail is used for fixing the T-shaped reinforcing plate on an old roadbed through the fixing hole.

Further, the T-shaped reinforcing plate is provided with meshes on the surface of the T-shaped vertical edge, and the multi-layer pavement structure on the new roadbed is connected with the old roadbed through the meshes of the T-shaped reinforcing plate, so that the fixation of the T-shaped reinforcing plate is enhanced.

Further, the T-shaped reinforcing plate is made of stainless steel material with good heat conductivity, so that a rigid body connection is formed at the joint part between the new roadbed and the old roadbed through the T-shaped reinforcing plate, and gaps between the new roadbed and the old roadbed are prevented from being generated or aggravated due to cold-hot expansion difference of the material between the new roadbed and the old roadbed.

Further, the grid is a glass fiber grid. The glass fiber grille is an excellent geosynthetic material for road surface reinforcement and old road reinforcement, has excellent performances of high tensile strength, low elongation, high temperature resistance, low cold resistance, aging resistance, corrosion resistance and the like, and is paved at the juncture between the multi-layer road structures, so that the overall stability of the new and old roadbeds is improved through layer-by-layer reinforcement, the small sedimentation of the new and old roadbeds after construction is ensured, and the longitudinal cracks caused by the non-uniformity of the sedimentation of the new and old roadbeds are reduced.

Further, the steps are inclined inwards along the slope surface of the old roadside, the gradient is 1% -3%, the width of the steps is not less than 2m, and the height of the steps is not less than 1m.

According to the utility model, a plurality of steps are arranged outside an old roadbed and a new roadbed, the T-shaped reinforcing plates are arranged on the steps, and the connecting frames extending in the multi-layer pavement structure on the new roadbed are arranged on the T-shaped reinforcing plates, so that the lateral displacement of the roadbed caused by shearing deformation is controlled, the settlement after construction of the roadbed is reduced, the integrity and the stability of the new roadbed and the old roadbed are ensured, the integral construction quality of the roadbed is greatly improved, the problem that the new roadbed and the old roadbed are cracked longitudinally due to uneven settlement and reflect cracks to the pavement is solved, and the glass fiber gratings are additionally arranged between the multi-layer pavement structure to strengthen the new roadbed layer by layer, so that the difference of the new roadbed and the old roadbed in the aspects of settlement deformation, rigidity and the like is made up.

Drawings

FIG. 1 is a schematic sectional view of a joint structure of an old roadbed and a new roadbed according to the present utility model.

Fig. 2 is an enlarged schematic view of part of a in fig. 1.

Fig. 3 is a schematic perspective view of a connection structure of the new and old roadbeds.

FIG. 4 is a schematic view of a joint structure of the new and old roadbeds after the grids are removed.

FIG. 5 is a second schematic view of the joint structure of the new and old roadbed after removing the grating.

Fig. 6 is a schematic perspective view of a T-shaped reinforcing plate.

Wherein: 1-old roadbed, 11-first step surface, 12-second step surface, 13-sinking groove, 2-new roadbed, 21-broken stone layer, 22-first concrete layer, 23-sand cushion layer, 24-second concrete layer, 3-T type reinforcing plate, 31-T type horizontal edge, 32-T type vertical edge, 33-fixed hole, 34-mesh, 4-overlap joint frame, 41-vertical rod, 5-rubber buffer strip, 6-grid and 7-connection nail.

Detailed Description

Embodiments of the present utility model will be briefly described below with reference to the drawings.

In the construction of widening roadbeds, sundries such as old road shoulders, side slope turf, tree roots, humus and loose roadbed fillers are removed firstly, the earth filling with the thickness of 50cm is removed from the surface layer of the side slope, loose soil on the slope must be cleaned timely, the slope is dug into inwards inclined steps along the slope surface of the old road side, the slope is inwards inclined by 1-3%, the width of the steps is not less than 2m, the height of the steps is not less than 1m, the steps are dug in a mode of selecting from bottom to top, the steps enable the new roadbeds 2 to be effectively combined with the old roadbeds 1 in a staggered mode, the contact area of the junction of the new roadbeds 2 and the old roadbeds 1 is increased, the shearing resistance of the junction is enhanced, the soft foundation treatment of the wide road embankment is convenient, the step width is required to meet the operation requirements of paving and compacting equipment, the mechanical construction is facilitated, the actual slope is guaranteed to be combined in the process, the slope is dug in a slope is reduced to a certain degree, the slope is dug to be gradually and the slope is gradually reduced to the maximum degree, and the slope is dug is gradually reduced to the slope is gradually and the slope is gradually reduced. The novel roadbed 2 is provided with a multi-layer pavement structure on the side corresponding to the steps, the pavement structure is sequentially provided with a gravel layer 21, a first concrete layer 22, a sand cushion layer 23 and a second concrete layer 24 from bottom to top, the bottom layer of the pavement structure is provided with the gravel layer 21 with good water permeability, so that compression deformation and water stability of the roadbed are reduced, the engineering cost and construction difficulty are comprehensively considered, the gravel content with the grain size larger than 2mm in the gravel layer 21 is required to be larger than 50%, the maximum grain size is smaller than 100mm, various indexes such as liquid-plastic limit, bearing ratio (CBR) and compaction test of filling materials are controlled, the first concrete layer 22 is paved on the upper part of the gravel layer 21, the whole leveling of the novel roadbed 2 is guaranteed, the sand cushion layer 23 is paved on the upper part of the first concrete layer 22, the sand cushion layer 23 adopts sand filler with the grain size smaller than 2mm, the sand cushion layer 23 enables the novel roadbed 2 to be more compact, the post-stage deformation is small, the whole sedimentation of the novel roadbed 2 is reduced, and the whole leveling of the first concrete layer 22 is further enhanced on the upper part of the sand cushion layer 23.

In this embodiment, in order to ensure the connection between the new roadbed 2 and the old roadbed 1, prevent the new roadbed 2 and the old roadbed 1 from cracking due to the difference of expansion coefficients of materials between the new roadbed 2 and the old roadbed 1, a T-shaped reinforcing plate 3 is connected between a first step surface 11 and a second step surface 12 of a step, referring to fig. 6, each T-shaped reinforcing plate 3 comprises a T-shaped horizontal edge 31 and a T-shaped vertical edge 32, the sides of the T-shaped horizontal edge 31 are provided with fixing holes 33, the inside of the fixing holes 33 are provided with connecting nails 7, the connecting nails 7 fix the T-shaped reinforcing plate 3 on the old roadbed 1 through the fixing holes 33, the surface of the T-shaped vertical edge 32 is provided with meshes 34, the multi-layer pavement structure on the new roadbed 2 is connected with the old roadbed 1 through the meshes 34 of the T-shaped reinforcing plate 3, thereby reinforcing the fixing of the T-shaped reinforcing plate 3 is made of stainless steel material with good thermal conductivity, the joint between the new roadbed 2 and the old roadbed 1 forms a rigid connection through the T-shaped reinforcing plate 3, so that the gap between the new roadbed 2 and the old roadbed 1 is avoided or aggravated due to the difference of cold and hot expansion of materials between the new roadbed 2 and the old roadbed 1, a sinking groove 13 is formed on the side, connected with the new roadbed 2, of the old roadbed 1, of the pavement, the height of the sinking groove 13 is consistent with the thickness of the T-shaped horizontal edge 31, therefore, after the upper T-shaped reinforcing plate 3 is installed, the T-shaped horizontal edge 31 is kept flush with the pavement of the old roadbed 1, the flatness of the pavement of the road is ensured, meanwhile, a rubber buffer strip 6 is further arranged at the abutting part between the second step surface 12 and the T-shaped reinforcing plate 3, so that the rubber buffer strip 6 realizes the adjustment between the new roadbed 2 and the old roadbed 1 due to the difference of cold and hot shrinkage under the condition of different cold and hot conditions between the new roadbed 2 and the old roadbed 1, thereby, the gap between the new roadbed 2 and the old roadbed 1 can be reduced, and faults between the new roadbed 2 and the old roadbed 1 can be avoided.

Referring to fig. 4 and 5, a plurality of overlapping frames 4 are provided on each T-shaped horizontal edge 31, the overlapping frames 4 are welded by reinforcing steel bars having a certain rigidity and good heat conductivity, the overlapping frames 4 extend on one side of the new roadbed 2, the overlapping frames 4 include vertical bars 41 extending up and down on both sides, the vertical bars 41 extend between adjacent road surface structures, the overlapping frames 4 on the adjacent T-shaped horizontal edges 31 are formed to be staggered up and down, the overlapping frames 4 are clamped together by fixing holes 33, because the overlapping frames 4 are staggered up and down, the connecting nails 7 on the fixing holes 33 penetrate through the fixing holes 33 in an up and down staggered manner, thereby the fixing holes 33 of the T-shaped horizontal edges 31 can be used for connecting the connecting nails 7 to be fixed on the old roadbed 1, the old roadbed 1 and the T-shaped reinforcing plate 3 are connected longitudinally through the connecting nails 7, so that heat conduction connection between the old roadbed 1 and the T-shaped reinforcing plate 3 is guaranteed, heat conduction balance between the old roadbed 1 and the T-shaped reinforcing plate 3 is achieved, the novel roadbed 2 is connected in a staggered mode through the lap joint frame 4, the structural strength of the novel roadbed 2 is enhanced, the heat conduction balance between the multi-layer pavement structures is improved, the integral interlayer faults between the multi-layer pavement structures, which are caused by external air temperature changes, are avoided, and the heat conduction balance between the novel roadbed 2 and the old roadbed 1 is also enhanced through the lap joint frame 4, so that faults between the novel roadbed 2 and the old roadbed 1 are avoided.

In this embodiment, referring to fig. 3, a grid 6 is laid at the boundary between the multi-layer pavement structures to strengthen the strength of the new roadbed 2, the upper part of the grid 6 is pressed against the bottom of the T-shaped horizontal edge 31 of the T-shaped reinforcing plate 3, in the specific implementation process, the grid 6 is usually a glass fiber grid, which is an excellent geosynthetic material for reinforcing the pavement and the old road, and has excellent performances such as high tensile strength, low elongation, high temperature resistance, low cold resistance, aging resistance, corrosion resistance, etc., the glass fiber grid is laid at the boundary between the multi-layer pavement structures, the overall stability of the new roadbed 2 and the old roadbed 1 is improved by reinforcing layer by layer, the sedimentation of the new roadbed 2 and the old roadbed 1 after the construction is ensured to be small, and the non-uniformity of the sedimentation of the new roadbed 2 and the old roadbed 1 is reduced, so that the longitudinal cracks are caused.

In this embodiment, in order to ensure the structural strength of the new roadbed 2, reduce the uneven settlement of the new roadbed 2 and the old roadbed 1, in the process of laying the multilayer pavement structure of the new roadbed 2, the roadbed needs to be reinforced by impact rolling, after the low-filling shallow-excavation section is excavated to the bottom surface of the roadbed or the retaining wall section to excavate steps, in order to perform impact rolling reinforcing treatment on the roadbed (excluding the old pavement part) within the scope of the newly built motor vehicle lane and the hard shoulder, the GQ320 impact road roller is adopted to perform rolling operation, and the compaction coefficient, the rolling pass number, the rolling speed, the optimal water content and the like are determined through a test section (preferably 200m as the test section). After impact rolling, leveling is performed by adopting a digging machine, final compaction is performed by adopting a heavy road roller, and aiming at the position where a local large road roller cannot compact, the compaction is performed by adopting a small road roller and assisting with a manual impact rammer, so that the compactness is ensured to meet the design and specification requirements.

In this embodiment, the multi-layer pavement structure and the grating 6 should be layered and filled and compacted according to the design section, the maximum loose thickness of the layered pavement structure is not more than 30cm, and the ultra-wide filling parts on two sides of the roadbed should be layered and filled and compacted together with the roadbed, so that the slope sticking phenomenon cannot occur. Meanwhile, the foundation and the bottom and the middle of the roadbed are reinforced by adopting the geosynthetic, so that the whole body is formed between the new roadbed 2 and the old roadbed 1, the grille 6 belongs to the most common geosynthetic, the connection position of the new roadbed 2 and the old roadbed 1 adopts the grille 6 to effectively prevent differential settlement, the grille 6 and the soil body are rubbed with each other, the vertical stress of the soil at the widened position is reduced, the bearing performance of the soil body is improved, the horizontally laid grille 6 has an elastic effect, and certain tension and ductility exist, so that the roadbed and the grille 6 are fused into a continuous and soft overall frame. Under the influence of the back-and-forth automobile load, accumulated change cannot occur, a locking effect is achieved on soil, the shear strength of the soil is fully highlighted, the lateral change of the soil is limited, a layer of high-strength grids 6 are paved at the bottom of an excavation step (the backfill surface of a clear surface of a substrate), a layer of high-strength grids 6 are respectively arranged at the middle part and the bottom of a spliced wide roadbed, a spliced wide roadbed with a filling size larger than 6m is filled, and a layer of high-strength grids 6 are additionally arranged every 4m except the high-strength grids 6 arranged on the substrate and the roadbed. The high-strength grille 6 is reversely wrapped at a position close to the slope, the reverse wrapping length is 2m, the high-strength grille 6 adopts a steel-plastic composite bidirectional grille 6, two rows of U-shaped steel nails are fixed on steps, the steel nail spacing at the steps is 0.5m, the spacing at other positions is 2m, the distance between the outermost steel nails and the edge of the grille 6 is 20cm, and the grille 6 is stretched in place when being covered with a net, buried in time and tightly prevented from insolation.

The foregoing examples merely illustrate embodiments of the utility model and are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (8)

1. The utility model provides a new old roadbed's linking structure, includes new roadbed and old roadbed, old roadbed with the linking department of new roadbed is provided with a plurality of steps, its characterized in that: the novel roadbed is located and corresponds to the step side has multilayer pavement structure, pavement structure sets gradually to rubble layer, first concrete layer, sand bed course and second concrete layer from down to up, the step includes first step face and second step face, is a plurality of be connected with T type reinforcing plate between first step face and the second step face of step, every T type reinforcing plate includes T type horizontal limit and T type vertical flange, every T type horizontal limit is equipped with a plurality of overlap joint frame, and a plurality of overlap joint frame extends new roadbed one side, the overlap joint frame includes the vertical pole that both sides extended from top to bottom, the extension of vertical pole upper and lower both sides is adjacent between the pavement structure, and a plurality of adjacent T type horizontal limit overlap joint frame forms the upper and lower staggered arrangement, and the multilayer the grid has been laid in juncture between the pavement structure, just grid upper portion supports presses the bottom of the T type horizontal limit of T type reinforcing plate.

2. The joint structure of new and old roadbed according to claim 1, wherein: and a rubber buffer strip is further arranged at the abutting part between the second step surface and the T-shaped reinforcing plate.

3. The joint structure of new and old roadbed according to claim 1, wherein: and the side, connected with the new roadbed, of the old roadbed is also provided with a sinking groove, and the height of the sinking groove is consistent with the thickness of the T-shaped horizontal edge.

4. The joint structure of new and old roadbed according to claim 1, wherein: the T-shaped reinforcing plate is characterized in that a fixing hole is formed in the side edge of the T-shaped horizontal edge of the T-shaped reinforcing plate, a connecting nail is arranged in the fixing hole, and the connecting nail penetrates through the fixing hole to fix the T-shaped reinforcing plate on an old roadbed.

5. The joint structure of new and old roadbed according to claim 1, wherein: the T-shaped reinforcing plate is provided with meshes on the surface of the T-shaped vertical edge, and the multilayer pavement structure on the new roadbed is connected with the old roadbed through the meshes of the T-shaped reinforcing plate.

6. The joint structure of new and old roadbed according to claim 1, wherein: the T-shaped reinforcing plate is made of stainless steel material with good heat conductivity.

7. The joint structure of new and old roadbed according to claim 1, wherein: the grid is a glass fiber grid.

8. The joint structure of new and old roadbed according to claim 1, wherein: the steps are inclined inwards along the slope surface of the old roadside, the gradient is 1% -3%, the width of the steps is not less than 2m, and the height of the steps is not less than 1m.