CN113622238A - Novel highway widened roadbed structure and construction method thereof - Google Patents

Abstract

The invention discloses a novel widened roadbed structure of a highway, which comprises an original roadbed, wherein a slope surface of the original roadbed is provided with a plurality of steps, fixing piles are longitudinally arranged on the steps, and connecting components are arranged between the fixing piles; a reinforcing layer is arranged below the original roadbed; a new roadbed is arranged on the top surface of the fixing pile and fixedly connected with the original roadbed; and a packing layer is arranged between the new roadbed and the original roadbed and is fixedly connected with the fixing piles. The novel highway widened roadbed structure and the construction method thereof provided by the invention have the advantages that the construction is simple, the construction efficiency is high, the original roadbed and the new roadbed are effectively combined through the fixing piles, the connecting assembly and the reinforcing layer, the probability of sideslip between the new roadbed and the original roadbed is reduced, the phenomena of instability of the new roadbed, damage to a road surface, uneven settlement of a combination part of the new roadbed and the old roadbed, reduction of the overall performance and the like of the widened highway are reduced, and the novel highway widened roadbed structure has important theoretical significance and use value for improving the highway reconstruction and expansion level in China and perfecting the road reconstruction and expansion technology in China.

Description

Novel highway widened roadbed structure and construction method thereof

Technical Field

The invention relates to the technical field of highway construction, in particular to a novel highway widened roadbed structure and a construction method thereof.

Background

With the development of national economy, the automobile holding capacity is greatly increased, the road passenger and cargo transportation is continuously and rapidly increased, traffic jam is caused, even malignant traffic accidents are caused, and the road traffic capacity needs to be expanded urgently. Compared with the road network encryption and the short-distance construction of new roads, the old road widening and reconstruction occupies less land and is relatively small in engineering investment, so that the widening and the construction of the expressway is an important problem to be solved and must be solved urgently in the highway construction of China in a period of time from the aspects of long-term development and economic benefit.

However, from the investigation situation, the treatment effect of a plurality of widened projects is poor, differential settlement of new and old road beds is difficult to be effectively controlled, phenomena such as instability of the new road bed, damage of the road surface and overall performance reduction are easy to occur after construction, and serious diseases such as longitudinal crack of the road surface occur soon after traffic is on. In addition, the performance of the roadbed and the road surface is obviously attenuated in a short time due to frequent damp-heat exchange between roadbed soil and air in southern areas in China, and the implementation of highway reconstruction and expansion engineering in southern areas in China faces greater technical difficulty risk challenges due to the wide distribution of special soil bodies such as high liquid limit soil in southern areas.

Therefore, key technical researches on roadbed construction and splicing of southern expressway reconstruction and expansion projects are carried out, and the method has important significance for improving the coordination deformability of the joints of the new roadbed and the old roadbed, reducing differential settlement, improving the utilization rate of special soil bodies such as high liquid limit soil and the like. Meanwhile, the research result has important theoretical significance and use value for improving the reconstruction and extension level of the expressway and perfecting the road reconstruction and extension technology in China.

Disclosure of Invention

The invention aims to provide a novel highway widened roadbed structure to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a novel widened roadbed structure of a highway, which comprises an original roadbed, wherein a slope surface of the original roadbed is provided with a plurality of steps, fixed piles are longitudinally arranged on the steps, and connecting components are arranged between the fixed piles;

a reinforcing layer is arranged below the original roadbed and is vertical to the fixing piles; the bottom end of the fixing pile penetrates through the reinforcing layer;

a new roadbed is arranged on the top surface of the fixing pile and fixedly connected with the original roadbed;

and a packing layer is arranged between the new roadbed and the original roadbed and is fixedly connected with the fixing piles.

Preferably, the connecting assembly comprises a first connecting rod and a second connecting rod; two ends of the first connecting rod are fixedly connected with the two fixing piles which are positioned on the same straight line on the adjacent steps respectively, and the first connecting rod is obliquely arranged; the second connecting rod is an X-shaped hinged rod, and four ends of the second connecting rod are fixedly connected to four adjacent rectangular fixing piles respectively.

Preferably, the fixed pile comprises a pile head, a top disc is fixedly connected to the lower end of the pile head, a pile body is fixedly connected to the lower end of the top disc, and an anchor head is fixedly connected to the bottom end of the pile body; a reinforcing component is arranged in the pile body; the upper ends of the pile head, the top disc and the pile body are fixedly connected with the packing layer.

Preferably, the pile body comprises a pile, the top end of the pile is fixedly connected with the top disc, and the lower end of the pile is fixedly connected with the anchor head; the outer wall of the pile is fixedly connected with a spiral rib; a cavity is formed in the pile, the top end of the cavity penetrates through the top disc and the pile head and is communicated with the outside, and the reinforcing component is arranged in the cavity; the top ends of the pile columns and the top ends of the spiral ribs are fixedly connected with the packing layer.

Preferably, the reinforcing component comprises a communication hole formed in the side wall of the pile, and the communication hole is communicated with the cavity; a fixing nail is connected in the communicating hole in a sliding way; and a plurality of limiting devices and a plurality of concrete holes are circumferentially arranged on the side wall of the communication hole.

Preferably, the limiting device comprises a limiting hole, the limiting hole is formed in the side wall of the communicating hole, the opening of the communicating hole faces the direction far away from the cavity, a limiting block is connected in the communicating hole in a sliding mode, and a limiting spring is fixedly connected between the limiting block and the hole bottom of the limiting hole; the concrete hole is arranged on the outer side of the limiting hole.

A construction method for widening a roadbed of a novel highway comprises the following construction steps:

a. clearing the surface of the original roadbed side slope, excavating the original roadbed, and excavating steps at the position of the original roadbed side slope;

b. constructing a reinforcing layer;

c. constructing a fixed pile and connecting the fixed pile;

d. pouring concrete in the fixing piles, and paving a reinforcing net;

e. paving a packing layer to be fixedly connected with the fixed piles;

f. and laying a new road surface.

Preferably, in the step a, the excavation depth of the original subgrade is 5-10 m.

Preferably, in the step d, the concrete poured into the fixed pile is poured for multiple times until the concrete surface does not sink any more.

Preferably, in the step e, the laying of the packing layer comprises a plurality of layers, and after each layer is laid, the next layer is laid after the layers are fully tamped and leveled.

The invention discloses the following technical effects: the invention provides a novel highway widened roadbed structure and a construction method thereof, wherein a plurality of steps are excavated at the side slope position of an original roadbed, so that the depth of a foundation pit of the new roadbed is ensured, the new roadbed can be conveniently subjected to multi-layer filling, the sinking rate of the new roadbed is reduced, and the collapse of the road surface of the original roadbed is prevented; the fixing piles are arranged on the steps, and the adjacent fixing piles are fixedly connected through the connecting components, so that traction is formed between the adjacent fixing piles to form a transverse and longitudinal powerful structural supporting net, longitudinal or transverse tension borne by a single fixing pile is dispersed to the fixing pile adjacent to the fixing pile, and further dispersed to the whole structure, and the stress of the single fixing pile is reduced, so that the transverse and longitudinal tension borne by the roadbed is effectively reduced; the whole fixed net formed by front, back, left and right can effectively reduce and improve the stability of the new roadbed and reduce the collapse rate of the new roadbed; the top surface of spud pile combines with the packing layer of new road bed, and the lower extreme and the step and the back up coat rigid coupling of former road bed, and then establish the connection between new road bed and the former road bed, prevent that the slope position of new road bed along former road bed from taking place to sideslip, prevent that the road surface of widening from taking place the road bed unstability, road surface damage scheduling problem, improved the stability of new road bed and new widening highway, prolonged life. The novel highway widened roadbed structure and the construction method thereof provided by the invention are simple and high in efficiency, the original roadbed and the new roadbed are effectively combined through the fixing piles, the connecting assembly and the reinforcing layer, the probability of sideslip between the new roadbed and the original roadbed is reduced, the phenomena of instability of the new roadbed, damage to a road surface, reduction of overall performance and the like of the widened highway are reduced, differential settlement between new and old roadbeds is effectively controlled, and the novel highway widened roadbed structure has important theoretical significance and use value for improving the highway reconstruction and extension level in China and perfecting the road reconstruction and extension technology in China.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a schematic structural view of a widened roadbed structure of the novel highway;

FIG. 2 is a three-dimensional view of a connecting assembly of the present invention;

FIG. 3 is a three-dimensional view of a spud pile according to the present invention;

FIG. 4 is a schematic view of the inventive spud pile construction;

FIG. 5 is an enlarged view of a portion of A in FIG. 4;

FIG. 6 is a schematic view of a communication hole according to the present invention;

FIG. 7 is a schematic view of the staple of the present invention;

wherein, 1, the original roadbed; 2. a step; 3. fixing the pile; 4. a reinforcement layer; 5. a new roadbed; 6. a filler layer; 7. a first connecting rod; 8. a second connecting rod; 9. pile head; 10. a pile body; 11. a top tray; 12. an anchor head; 601. layering; 602. a reinforcing mesh; 1001. pile columns; 1002. a helical rib; 1003. a cavity; 1004. a communicating hole; 1005. fixing nails; 1006. concrete holes; 1007. a limiting hole; 1008. a limiting spring; 1009. a limiting block; 10041. a limiting groove; 10042. a sealing gasket; 10051. a nail head; 10052. a nail body; 10053. a wire; 10054. a connector lug; 10055. a slider; 1201. the disc is enlarged.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1-7, the invention provides a novel widened roadbed structure of a highway, which comprises an original roadbed 1, wherein a slope surface of the original roadbed 1 is provided with a plurality of steps 2, fixed piles 3 are longitudinally arranged on the steps 2, and connecting components are arranged between the fixed piles 3;

a reinforcing layer 4 is arranged below the original roadbed 1, and the reinforcing layer 4 is vertical to the fixing piles 3; the bottom end of the fixed pile 3 penetrates through the reinforcing layer 4; the bottom end of the slope of the original roadbed 1, which is far away from the original road surface, needs to dig a foundation pit with a certain depth, and the construction of the reinforcing layer 4 starts from the side wall of the foundation pit and is carried out towards the original roadbed 1, so that the foundation strength below the original roadbed 1 is enhanced, and the combination of the fixing pile 3 and the original roadbed 1 is facilitated.

A new roadbed 5 is arranged on the top surface of the fixed pile 3, and the new roadbed 5 is fixedly connected with the original roadbed 1;

a packing layer 6 is arranged between the new roadbed 5 and the original roadbed 1, and the packing layer 6 is fixedly connected with the fixed piles 3.

Furthermore, the reinforced layer 4 is selected from high-pressure concrete jet grouting piles, namely the high-pressure jet grouting piles are made of cement paste, the cement paste is sprayed into the soil layer through a rotating nozzle at high pressure to be mixed with the soil body to form a cement soil reinforced body, and the cement paste and the soil body are mutually overlapped to form row piles. Further construction process and principle are prior art, and are not described herein.

Further, in order to further improve the strength of the reinforcing layer 4, reinforcing steel may be added to the reinforcing layer 4.

Further, packing layer 6 contains a plurality of layering 601, and during the construction, the layer-by-layer construction, need all tamp after every construction one deck, then one deck after the construction, still need add reinforcing mesh 602 according to the standard requirement during the construction, and reinforcing mesh 602 chooses geogrid for use, and the material is plastics, and toughness, intensity are high, and the pull resistance is good, long service life.

Furthermore, the material of the packing layer 6 is the same as that of the original roadbed 1, if the material can not be the same as that of the original roadbed 1, mountain skin soil or sand gravel with more stone content is selected as far as possible, the compressibility is small, the compression modulus is large, the water stability is good, the compression deformation of the roadbed can be greatly reduced, and the bearing capacity of the roadbed is improved.

Furthermore, the filler can be made of light materials such as lime, fly ash, polystyrene block EPS, fly ash, foamed light concrete and the like under the condition that the conditions allow; the light material has low self weight. The compression deformation is small, and the packing layer 6 for the roadbed can not only reduce the rigidity and strength difference between the new roadbed and the old roadbed, but also reduce the plastic deformation cumulant of the new roadbed 5 and reduce the uneven settlement of the new roadbed and the old roadbed.

In a further optimized scheme, the connecting assembly comprises a first connecting rod 7 and a second connecting rod 8; two ends of a first connecting rod 7 are fixedly connected with two fixing piles 3 which are positioned on the same straight line on the adjacent steps 2, and the first connecting rod 7 is obliquely arranged; the second connecting rod 8 is an X-shaped hinged rod, and four ends of the second connecting rod 8 are fixedly connected to four adjacent rectangular fixing piles 3 respectively. Two ends of a first connecting rod 7 are respectively connected with two adjacent fixing piles 3 which are positioned on the same straight line on the adjacent steps 2, wherein one end of the step 2 positioned at the lower part is higher than the other end to form a supporting angle opposite to the slope surface of the original roadbed 1, the direction of relative sliding between the new roadbed 5 and the original roadbed 1 is opposite, and the first connecting rod has better supporting effect on the sliding between the new roadbed and the old roadbed; simultaneously all be connected with head rod 7 between per two adjacent spud piles 3 that accord with the condition, even become a whole with spud pile 3 from top to bottom on the line, the pulling force that will take place to slide disperses, prevents that the excessive concentration of pulling force from damaging spud pile 3. Second connecting rod 8 is the X type, has four to connect, comprises two connecting rods at the mutual articulated in middle part, and its four connect respectively with arbitrary adjacent be rectangular distribution's four spud piles 3 on, form a network structure, with spud pile 3 on the 1 face of whole former road bed be connected into a whole, all have fine dispersion effect to the horizontal pulling force and the vertical pulling force that new road bed 5 received, can effectively reduce new road bed 5 collapse rate.

According to a further optimized scheme, the fixed pile 3 comprises a pile head 9, wherein a top disc 11 is fixedly connected to the lower end of the pile head 9, a pile body 10 is fixedly connected to the lower end of the top disc 11, and an anchor head 12 is fixedly connected to the bottom end of the pile body 10; a reinforcing component is arranged in the pile body 10, and a reinforcing component is arranged in the pile body 10; the upper ends of the pile head 9, the top disc 11 and the pile body 10 are fixedly connected with the packing layer 6; the pile body 10 comprises a pile 1001, the top end of the pile 1001 is fixedly connected with the top disc 11, and the lower end of the pile 1001 is fixedly connected with the anchor head 12; the outer wall of the pile 1001 is fixedly connected with a spiral rib 1002; a cavity 1003 is formed in the pile 1001, the top end of the cavity 1003 penetrates through the top disc 11 and the pile head 9 and is communicated with the outside, the reinforcing component is arranged in the cavity 1003, and the top end of the pile 1001 and the top end of the spiral rib 1002 are fixedly connected with the packing layer 6; the reinforcing component comprises a communication hole 1004 which is arranged on the side wall of the pile 1001, and the communication hole 1004 is communicated with the cavity 1003; a fixing nail 1005 is slidably connected in the communication hole 1004; the side wall of the communication hole 1004 is circumferentially provided with a plurality of limiting devices and a plurality of concrete holes 1006; the limiting device comprises a limiting hole 1007, the limiting hole 1007 is formed in the side wall of the communicating hole 1004, the opening of the communicating hole 1004 faces the direction far away from the cavity 1003, a limiting block 1009 is connected in the communicating hole 1004 in a sliding mode, and a limiting spring 1008 is fixedly connected between the limiting block 1009 and the bottom of the limiting hole 1007; the concrete hole 1006 is disposed outside the stopper hole 1007. The pile head 9 is a hollow sleeve, external threads are arranged on the outer edge of the pile head, the pile head is fixedly connected with a pile driver (not shown) through the external threads, the pile driver drives the pile head 9, a top disc 11 fixedly connected with the pile head 9 and a pile body 10 to rotate, an anchor head 12 is pushed to drill downwards, and the fixed pile 3 is constructed in a foundation below the step 2. The communicated side wall is connected with the outer wall of the fixing nail 1005 in a sealing manner and can slide at the same time, and the sliding direction is a direction far away from the cavity 1003; after the fixed pile 3 is driven to a preset depth by the pile driver, the pile driver is disconnected from the pile head 9, an air compressor (not shown in the figure) is communicated with the pile head 9, and then high-pressure air is introduced into the cavity 1003 through the pile head 9; due to the sealing design of the cavity 1003 and the communication hole 1004, compressed air in the cavity 1003 cannot be exhausted, the pressure in the cavity 1003 is increased, and the fixing nail 1005 is connected with the communication hole 1004 in a sliding mode, the sliding direction is far away from the cavity 1003, so that the high-pressure compressed air pushes the fixing nail 1005 to slide outwards of the communication hole 1004; in the sliding process of the fixing nail 1005, the tail end of the fixing nail 1005 moves in the direction away from the cavity 1003, then the limiting device is released, the outer wall of the fixing nail 1005 does not press the limiting block 1009 any more, and the limiting block 1009 slides out of the limiting hole 1007 under the pushing of the limiting spring 1008; because spacing hole 1007 slant is seted up, consequently stopper 1009 also is diagonal bracing staple 1005, when staple 1005 rolled back, by stopper 1009 died, can't return, staple 1005 continues to slide under highly compressed promotion, until spilling concrete hole 1006, concrete hole 1006 communicates cavity 1003 with the external world, cavity 1003 internal pressure no longer risees, staple 1005 stretches out during intercommunicating pore 1004 alternates into earth all around this moment, the associativity of spud pile 3 with foundation earth all around has been increased, the stability of spud pile 3 has been improved. Disconnecting the pile head 9 from the air compressor, then injecting the stirred concrete fluid into the cavity 1003 through the pile head 9, enabling the concrete fluid to flow into the cavity 1003 and then enter the communication hole 1004, and finally flowing out of the cavity 1003 through the concrete hole 1006 to permeate into the foundation around the pile 1001; the concrete fluid is injected for multiple times, the concrete liquid level is pressed and tamped after the concrete fluid is injected for each time until the liquid level of the concrete is not lowered, and the concrete fluid is solidified to tightly combine the foundations around the pile body 10 of the pile body 10, so that the stability of the foundation is further improved, the combination strength of the fixing pile 3 and the foundation is also improved, and the new foundation at the top end of the fixing pile 3 and the new pavement on the new foundation are prevented from sliding and breaking.

Further, in order to improve the drilling capability of the anchor head 12 and prevent hard objects such as underground stones from damaging the anchor head 12, an expansion disc 1201 is fixed to the top end of the anchor head 12, and the diameter of the expansion disc 1201 is smaller than that of the pile 1001, so that the anchor head 12 can be effectively prevented from being damaged.

Further, in order to improve the air tightness between the cavity 1003 and the communication hole 1004, a sealing gasket 10042 is provided between the communication hole 1004 and the sidewall of the fixing nail 1005, so that when the cavity 1003 is inflated, the gap between the fixing nail 1005 and the communication hole 1004 is prevented from being leaked, and the air pressure cannot be increased.

Further, in order to facilitate the detachment of the fixing pile 3, the fixing nail 1005 includes a nail head 10051 and a nail body 10052, the nail head 10051 and the nail body 10052 are fixedly connected, and the nail body 10052 is located at a side of the communicating hole 1004 facing the cavity 1003; nail body 10052 is made for the metal of easy fusing, and nail body 10052 has connector 10054 through wire 10053 electric connection, and when needs demolish spud pile 3, connector 10054 switch on (not shown in the figure), and the circular telegram back nail body 10052 generates heat and fuses, separates with pin head 10051, then through pile driver counter-rotation pile head 9, can take out spud pile 3.

Further, in order to limit the sliding of the fixing nail 1005, a limit groove 10041 is formed in the side wall of the communication hole 1004 along the sliding direction of the fixing nail 1005, a slider 10055 matched with the limit groove 10041 is fixedly connected to the outer wall of the nail body 10052, and when the fixing nail 1005 is displaced under the action of compressed air, the displacement is performed along the limit groove 10041, so that the displacement of the fixing nail 1005 is prevented from being deviated. Limiting device and concrete hole 1006 all set up the tank bottom at spacing groove 10041.

A construction method for widening a roadbed of a novel highway comprises the following construction steps:

a. clearing the side slope of the original roadbed 1, excavating the original roadbed 1, and excavating steps 2 at the side slope position of the original roadbed 1; the surface soil on the slope surface of the slope of the original roadbed 1 and the outside road shoulder within the range of 0.3-0.5 m is removed, because the surface soil is eroded by the external environment and water flow for a long time, the structure is loose, the side limit effect is low, and if the surface soil is used as a combined part of a new roadbed and an old roadbed, the deformation resistance is low, and the splicing effect of the new road surface and the old road surface is poor. The method has the advantages that grass roots, tree roots, branches and the like in the near-layer soil of the ground surface are cleaned, so that firstly, the phenomenon that the roadbed collapses caused by gaps generated on splicing surfaces of new and old roadbeds due to the rot and growth of ground surface plants is prevented; secondly, the roadbed filling is prevented from being polluted, so that the roadbed filling is softened, and the new roadbed 5 is easy to generate sliding cracks; thirdly, water is easily poured into along the gap, the drainage effect is reduced, and the roadbed is easily scoured and softened. According to the design requirements and the surrounding environment and widening conditions of the original roadbed 1, the excavation depth of the tail end of the original roadbed 1 is 5-10 m, so that a compact foundation is excavated, and the subsequent construction of the reinforcing layer 4 is facilitated. And then, excavating steps 2 on the slope surface of the original roadbed 1, and specifically designing and determining the height and width of the steps 2 according to actual construction conditions and geological conditions.

b. Constructing a reinforcing layer 4; constructing a high-pressure concrete jet grouting pile in the direction of the original roadbed 1 by using a high-pressure jet grouting machine, wherein the construction depth is directly reached to the lower end of the original pavement; the construction is carried out on the side wall of the foundation pit.

c. Constructing a fixed pile 3 and connecting the fixed pile 3; driving a fixed pile 3 into the step 2 through a pile driver, wherein the construction density is determined by the site geological conditions and the construction conditions; then connect first connecting rod 7 and second connecting rod 8 between spud pile 3 in proper order, link spud pile 3 into a whole, improve the whole longitudinal tensile resistance and the horizontal tensile resistance of spud pile 3.

d. The fixed pile 3 is poured with concrete, and a reinforcing net 602 is laid; injecting the stirred fluid concrete into the fixed pile 3 for multiple times, and pressurizing and tamping the liquid level of the concrete after each injection until the liquid level of the concrete is not lowered; then, the reinforcing net 602 is laid according to the requirements of the geotechnical engineering construction specifications, the geogrid is selected as the reinforcing net 602, the material is selected from a plastic material, the strength is high, the corrosion resistance is good, and the service life is long.

e. Paving a packing layer 6 to be fixedly connected with the fixed pile (3); the packing layer 6 comprises a plurality of layers, and during construction, the layer-by-layer construction is carried out, the tamping is needed after each layer of construction is finished, then the reinforcing mesh 602 is added according to the standard requirement during the construction of the later layer, and the reinforcing mesh 602 is made of plastic and selected from geogrids.

f. Laying a new road surface, laying a filler layer 6 to a certain height from the original road surface, laying the filler layer 6 in a plurality of layers, tamping each layer after laying, laying a plurality of layers of materials with the same quality as the original road surface materials as the new road surface, and tightly combining the layers to ensure that the original road surface is tightly combined with the new road surface.

The using method comprises the following steps:

cleaning and excavating an original roadbed 1, and excavating a step 2 on the original roadbed 1; removing surface soil within the range of 0.3-0.5 m on the slope surface and the outside shoulder of the original roadbed 1, and cleaning grass roots, tree roots and branches and the like in the near-layer soil on the surface of the roadbed; and finally, excavating the tail end of the original roadbed 1 to a depth of 5-10 m according to the environment and widening conditions around the original roadbed 1, and excavating steps 2 on the slope surface of the original roadbed 1.

Constructing a reinforcing layer 4; and constructing a high-pressure concrete jet grouting pile in the direction of the original roadbed 1 by using a high-pressure jet grouting machine, wherein the construction depth reaches the lower end of the original pavement.

Constructing a fixed pile 3 and connecting the fixed pile 3; driving a fixed pile 3 into the step 2 through a pile driver, wherein the construction density is determined by the site geological conditions and the construction conditions; after the fixed pile 3 is driven to a preset depth through the pile driver, the pile driver is disconnected with the pile head 9, then the air compressor is communicated with the pile head 9, and then high-pressure air is introduced into the cavity 1003 through the pile head 9; the high-pressure compressed air pushes the fixing nail 1005 to slide out of the communication hole 1004; in the sliding process of the fixing nail 1005, the tail end of the fixing nail 1005 moves in the direction away from the cavity 1003, then the limiting device is released, the limiting block 1009 slides out of the limiting hole 1007 under the pushing of the limiting spring 1008, the fixing nail 1005 is deadly jacked, and cannot return; the staple 1005 continues to slide under the promotion of high pressure, leaks concrete hole 1006 until, and concrete hole 1006 communicates cavity 1003 with the external world, and cavity 1003 internal pressure no longer risees this moment, and staple 1005 stretches out during the intercommunicating pore 1004 alternates into earth all around, has increased the associativity of spud pile 3 and foundation earth all around, has improved the stability of spud pile 3 this moment.

Then, connecting a first connecting rod 7 and a second connecting rod 8 between the fixing piles 3 in sequence, wherein two ends of the first connecting rod 7 are respectively connected with two adjacent fixing piles 3 which are positioned on the same straight line on the adjacent steps 2, and one end of the lower step 2 is higher than the other end of the lower step to form a supporting angle opposite to the slope of the original roadbed 1; four joints of the second connecting rod 8 are respectively connected with any adjacent four fixing piles 3 which are distributed in a rectangular mode to form a net structure, the fixing piles 3 on the surface of the whole original roadbed 1 are connected into a whole, the fixing piles 3 are connected into a whole, and the whole longitudinal tensile resistance and the transverse tensile resistance of the fixing piles 3 are improved.

The fixed pile 3 is poured with concrete, and a reinforcing net 602 is laid; injecting the stirred fluid concrete into the fixed pile 3 for multiple times, and pressurizing and tamping the liquid level of the concrete after each injection until the liquid level of the concrete does not descend any more; then, the reinforcing net 602 is laid according to the requirements of the geotechnical engineering construction specifications, the geogrid is selected as the reinforcing net 602, and the material is plastic.

Paving a packing layer 6; the packing layer 6 comprises a plurality of layers, and during construction, the layer-by-layer construction is carried out, the tamping is needed after each layer of construction is finished, then the reinforcing mesh 602 is added according to the standard requirement during the construction of the later layer, and the reinforcing mesh 602 is made of plastic and selected from geogrids.

Laying a new road surface, laying a filler layer 6 to a certain height from the original road surface, tamping, and laying a plurality of layers of materials with the same quality as the original road surface as the new road surface to tightly combine the original road surface and the new road surface.

The novel highway widened roadbed structure and the construction method thereof provided by the invention are simple and high in efficiency, the original roadbed 1 and the new roadbed 5 are effectively combined through the fixing piles 3, the connecting components and the reinforcing layer, the probability of sideslip between the new roadbed 5 and the original roadbed 1 is reduced, the phenomena of instability of the new roadbed 5, pavement damage, overall performance reduction and the like of the widened highway are reduced, differential settlement between new and old roadbeds is effectively controlled, and the novel highway widened roadbed structure has important theoretical significance and use value for improving the highway reconstruction and expansion level in China and perfecting the road reconstruction and expansion technology in China.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (10)

1. The utility model provides a novel roadbed structure is widened to highway, includes former road bed (1), its characterized in that: the slope surface of the original roadbed (1) is provided with a plurality of steps (2), fixed piles (3) are longitudinally arranged on the steps (2), and connecting assemblies are arranged among the fixed piles (3);

a reinforcing layer (4) is arranged below the original roadbed (1), and the reinforcing layer (4) is vertical to the fixing piles (3); the bottom end of the fixed pile (3) penetrates through the reinforcing layer (4);

a new roadbed (5) is arranged on the top surface of the fixing pile (3), and the new roadbed (5) is fixedly connected with the original roadbed (1);

a packing layer (6) is arranged between the new roadbed (5) and the original roadbed (1), and the packing layer (6) is fixedly connected with the fixing piles (3).

2. The novel highway widening roadbed structure according to claim 1, wherein: the connecting assembly comprises a first connecting rod (7) and a second connecting rod (8); two ends of the first connecting rod (7) are fixedly connected with the two fixing piles (3) which are positioned on the same straight line on the adjacent steps (2) respectively, and the first connecting rod (7) is obliquely arranged; the second connecting rod (8) is an X-shaped hinged rod, and four ends of the second connecting rod (8) are fixedly connected to four adjacent rectangular fixing piles (3) respectively.

3. The novel highway widening roadbed structure according to claim 1, wherein: the fixed pile (3) comprises a pile head (9), the lower end of the pile head (9) is fixedly connected with a top disc (11), the lower end of the top disc (11) is fixedly connected with a pile body (10), and the bottom end of the pile body (10) is fixedly connected with an anchor head (12); a reinforcing component is arranged in the pile body (10); the upper ends of the pile head (9), the top disc (11) and the pile body (10) are fixedly connected with the packing layer (6).

4. The novel highway widening roadbed structure according to claim 3, wherein: the pile body (10) comprises a pile (1001), the top end of the pile (1001) is fixedly connected with the top disc (11), and the lower end of the pile (1001) is fixedly connected with the anchor head (12); the outer wall of the pile column (1001) is fixedly connected with a spiral rib (1002); a cavity (1003) is formed in the pile column (1001), the top end of the cavity (1003) penetrates through the top disc (11) and the pile head (9) and is communicated with the outside, and the reinforcing component is arranged in the cavity (1003); the top ends of the pile columns (1001) and the spiral ribs (1002) are fixedly connected with the packing layer (6).

5. The novel highway widening roadbed structure according to claim 4, wherein: the reinforcing component comprises a communication hole (1004) formed in the side wall of the pile (1001), and the communication hole (1004) is communicated with the cavity (1003); a fixing nail (1005) is connected in the communication hole (1004) in a sliding way; the side wall of the communication hole (1004) is circumferentially provided with a plurality of limiting devices and a plurality of concrete holes (1006).

6. The novel highway widening roadbed structure according to claim 5, wherein: the limiting device comprises a limiting hole (1007), the limiting hole (1007) is formed in the side wall of the communicating hole (1004), the opening of the communicating hole (1004) faces the direction far away from the cavity (1003), a limiting block (1009) is connected in the communicating hole (1004) in a sliding mode, and a limiting spring (1008) is fixedly connected between the limiting block (1009) and the hole bottom of the limiting hole (1007); the concrete hole (1006) is arranged on the outer side of the limiting hole (1007).

7. A construction method of a novel highway widened roadbed structure, according to any one of claims 1-6, is characterized by comprising the following construction steps:

a. clearing the surface of the side slope of the original roadbed (1), excavating the original roadbed (1), and excavating steps (2) at the position of the side slope of the original roadbed (1);

b. constructing a reinforcing layer (4);

c. constructing a fixed pile (3) and connecting the fixed pile (3);

d. concrete is poured into the fixing piles (3), and reinforcing nets are laid;

e. paving a packing layer (6) and fixedly connecting the packing layer with the fixed piles (3);

f. and laying a new road surface.

8. The construction method of the novel highway widened roadbed according to claim 7, wherein the construction method comprises the following steps: in the step a, the excavation depth of the original roadbed (1) is 5-10 m.

9. The construction method of the novel highway widened roadbed according to claim 7, wherein the construction method comprises the following steps: and in the step d, pouring concrete for the fixed piles (3) for multiple times until the concrete surface does not sink any more.

10. The construction method of the novel highway widened roadbed according to claim 7, wherein the construction method comprises the following steps: in the step e, the laying of the packing layer (6) comprises a plurality of layers, and after each layer is laid, the next layer is laid after the layers are fully tamped and tamped.

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