Road widening spliced roadbed structure

Abstract

The utility model relates to a road widening spliced roadbed structure, which comprises a field base surface paved with a first roadbed, the side edge of the first roadbed is provided with a double-layer step, and an embedded connection module is embedded on the double-layer step; a prefabricated forming baffle is further supported on the on-site base face, and the space between the prefabricated forming baffle and the first roadbed is filled with a second roadbed which wraps the embedded connection module and is flush with the first roadbed. An integrated processing assembly which is in sliding connection with the prefabricated forming baffle plate is also arranged above the second roadbed; the prefabricated forming baffle and the first roadbed are further connected in a distance limiting mode through an elastic adjustable tensioning assembly which is transversely arranged in an inserted mode. According to the utility model, the splicing stability and compactness of the old roadbed and the new roadbed are improved when the road is widened by constructing a multidirectional steel bar traction shaping structure and utilizing a splicing stability-improving structure formed by combining a plurality of connection limiting shaping modes.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled structures for subgrade expansion, in particular to a highway widening and splicing subgrade structure. Background Art

[0002] The subgrade is the foundation of the road surface and is a geotechnical structure formed by excavation or filling. In order to meet the increasing demand for vehicle traffic, it is necessary to widen and reconstruct the existing road to improve its vehicle carrying capacity. The existing road widening method usually involves directly excavating a trench on one side of the original road, and then pouring concrete directly into the trench to achieve the widening and splicing of the road, so as to increase the width of the road.

[0003] However, due to the perennial rolling of the old subgrade, its settlement deformation approaches the saturation within a certain strength range, resulting in a relatively small settlement change. However, since the new subgrade has not been fully rolled over the years, it is prone to subsidence during vehicle passage. This is because of the uneven settlement between the new and old subgrades and the interface strength between the new and old roads being lower than the strength of the structural layer material itself. When the joint between the new and old subgrades bears a large load, cracking or collapse may occur at the joint between the new and old subgrades. Although some existing technologies improve the connection strength between the old and new subgrades by horizontally inserting some of the steel bars in the steel cage embedded in the new subgrade into the old subgrade, the steel bars are connected to the old subgrade by means of single-directional hole plugging. When the new subgrade is subjected to rolling pressure, it can only provide a single-directional pulling and shaping force, and cannot achieve force balance through multi-directional pulling, resulting in the defect of insufficient stability. As a result, the connection tightness between the new and old subgrades is insufficient, and it is extremely easy to cause the failure of the pulling connection due to uneven force and different settlement strengths under long-term rolling, thus leading to cracking and collapse at the joint. Content of the Utility Model

[0004] The purpose of the utility model is to provide a highway widening and splicing subgrade structure that can improve the splicing stability and tightness between the old and new subgrades during road widening by constructing a multi-directional steel bar pulling and shaping structure and combining various connection limiting and shaping methods, so as to solve the problems that the existing road widening structure has poor connection stability and tightness between the new and old subgrades, and cannot improve its connection strength through multi-directional force and adjustable pulling and shaping, resulting in easy cracking or collapse at the joint between the new and old subgrades when subjected to uneven forces.

[0005] The technical solution adopted by the utility model is as follows: a road widening and splicing subgrade structure, including a field base surface paved with a first subgrade, a double-layer step is provided on the side of the first subgrade, and an embedding connection module is embedded on the double-layer step; a preformed baffle is also supported on the field base surface, and a second subgrade that wraps the embedding connection module and is flush with the first subgrade is filled between the preformed baffle and the first subgrade; an integrated processing component slidably connected to the preformed baffle is also arranged above the second subgrade; the preformed baffle and the first subgrade are also connected by a horizontally inserted elastic adjustable tensioning component for distance limitation.

[0006] According to a preferred embodiment, the embedding connection module includes a first steel bar partially horizontally inserted into the upper vertical surface of the double-layer step, a second steel bar partially vertically inserted into the stepped plane of the double-layer step, and a third steel bar partially horizontally inserted into the lower vertical surface of the double-layer step; one end of the first steel bar away from the upper vertical surface is connected to one end of the second steel bar away from the stepped plane through a longitudinal steel bar; the longitudinal steel bar is also connected to the third steel bar through interlocking steel bars arranged at intervals in its axial direction.

[0007] According to a preferred embodiment, the upper vertical surface and the lower vertical surface are respectively located at two opposite side edges of the stepped plane, so as to cooperatively form an assembled stepped surface; a plurality of inverted ladder grooves are opened on the stepped plane of the double-layer step, and the second steel bar is inserted between adjacent inverted ladder grooves.

[0008] According to a preferred embodiment, the preformed baffle includes a main board body, a support slope body and a connecting plate. Among them, a support slope body is arranged on the side of the main board body away from the first subgrade, and the connecting plate parallel to the field base surface is connected to the side of the support slope body away from the main board body.

[0009] According to a preferred embodiment, a plurality of openings are spaced apart in the plate body of the connecting plate, and lengthened ground nails inserted into the field base surface are inserted into the openings.

[0010] According to a preferred embodiment, a sliding groove is also opened on the side of the main board body away from the first subgrade, and the pulley group sliding rail for supporting the installation plate of the integrated processing component is rail-connected in the sliding groove.

[0011] According to a preferred embodiment, a shock-absorbing guide wheel on the first subgrade is also arranged on the side of the installation plate away from the pulley group, a leveling inclined plate capable of leveling the concrete for constructing the second subgrade is arranged on the lower surface of the installation plate, and a lifting frame capable of lifting and inserting the vibration unit into the second subgrade is supported on the upper surface of the installation plate.

[0012] According to a preferred embodiment, the pulley block includes side plates, pulleys, rotating shafts, and elastic support rods. Among them, the pulleys are inserted on the side plates at intervals through the rotating shafts; the pulleys are rail-connected in the chute; the side plates are connected to the mounting plate through the elastic support rods.

[0013] According to a preferred embodiment, the elastically adjustable tensioning assembly includes a first baffle, a threading cable, a connecting screw, a strong tension spring, a positioning plate, and an adjusting nut. The threading cable is inserted in the preformed baffle and the first roadbed, and both ends thereof penetrate and abut against the first baffle on the surfaces of the preformed baffle and the first roadbed and are connected to the connecting screw; the strong tension spring is also sleeved on a partial section of the threading cable connected to the connecting screw; the connecting screw is threadedly inserted on the positioning plate, and the adjusting nut is also provided on the rod body of the connecting screw penetrating the positioning plate.

[0014] According to a preferred embodiment, a first reinforcing bar is further provided on one side of the interlocking reinforcing bar away from the first roadbed; a second reinforcing bar connected to the first reinforcing bar or the interlocking reinforcing bar is also inserted in the inverted ladder groove.

[0015] The beneficial effects of the present utility model are:

[0016] The inverted ladder groove provided in the present application can further increase the contact area between the first roadbed and the second roadbed, and at the same time, improve the stability after connection by expanding the docking form of the two. In particular, the inverted ladder groove and the concrete poured in the inverted ladder groove can limit the lateral splitting force when the two have different strength settlements, thereby improving the docking stability, reducing the possibility that the second roadbed undergoes excessive settlement and tilts relative to the first roadbed, resulting in cracks at the connection between the two, and greatly improving the connection stability and the lateral tension deformation strength.

[0017] The embedded connection module provided in the present application can ensure the connection stability strength with the first roadbed through multi-directional plugging of the steel reinforcement cage constructed by it and the original first roadbed. In particular, the horizontal and vertical plugging and matching can synergistically improve the anti-deformation ability and the balanced decomposition of the force during rolling, thereby improving the connection precision and stability.

[0018] The integrated processing component provided in this application can slide along the road extension direction relative to the main board body, so that the flat inclined plate of the integrated processing component can scrape the surface of the concrete in the casting cavity where the concrete pouring is completed during the directional translation, making the upper plane of the formed second roadbed flush with the surface of the first roadbed. In addition, the vibration unit arranged in front of the movement of the flat inclined plate can penetrate into the concrete for vibration defoaming and evacuation treatment, thereby ensuring the filling saturation of the concrete forming the second roadbed.

[0019] The elastic adjustable tensioning component provided in this application can always maintain the distance between the prefabricated forming baffle and the first roadbed by adjusting the pulling strength, thereby effectively defining the relative positions of the prefabricated forming baffle, the second roadbed, and the first roadbed, and ensuring the firmness of the splicing of the three. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a preferred highway widening and splicing roadbed structure proposed by the present utility model;

[0021] Figure 2 is a schematic structural diagram of the integrated processing component of a preferred highway widening and splicing roadbed structure proposed by the present utility model;

[0022] Figure 3 is a schematic structural diagram of the elastic adjustable tensioning component of a preferred highway widening and splicing roadbed structure proposed by the present utility model.

[0023] List of Reference Numerals

[0024] 1: First roadbed; 2: Field base surface; 3: Embedded connection module; 4: Prefabricated forming baffle; 5: Second roadbed; 6: Integrated processing component; 7: Elastic adjustable tensioning component; 11: Double-layer step; 111: Upper vertical surface; 112: Step plane; 113: Lower vertical surface; 114: Inverted ladder groove; 31: First steel bar; 32: Second steel bar; 33: Third steel bar; 34: Longitudinal steel bar; 35: Interlocking steel bar; 36: First reinforcing steel bar; 37: Second reinforcing steel bar; 41: Main board body; 42: Support slope body; 43: Connecting plate; 44: Extended ground nail; 411: Chute; 431: Opening; 61: Mounting plate; 62: Pulley group; 63: Shock-absorbing guide wheel; 64: Flat inclined plate; 65: Vibration unit; 66: Lifting frame; 621: Side plate; 622: Pulley; 623: Rotating shaft; 624: Elastic support rod; 71: First baffle; 72: Threaded cable; 73: Connecting screw; 74: Strong tension spring; 75: Positioning plate; 76: Adjusting nut. Detailed Description of the Embodiment

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the accompanying drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the accompanying drawings is only some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0026] The following will refer to the accompanying drawings and describe in detail the technical solutions provided by the present invention through embodiments. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation on the present invention. In some examples, since some embodiments belong to the prior art or conventional technology, they are not described or not described in detail.

[0027] In addition, the technical features described herein, or the steps in all the methods or processes disclosed, except for mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or the operation sequence of the methods related to the embodiments provided herein can also be changed. Any sequence in the accompanying drawings and the embodiments is only for illustrative purposes and does not imply a requirement to follow a certain sequence, unless it is clearly stated that a certain sequence is required.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, under reasonable circumstances (without self-contradiction), both include direct and indirect connection (coupling).

[0029] The following will be described in detail with reference to the accompanying drawings.

[0030] Embodiment 1

[0031] This application provides a road widening and splicing subgrade structure, which includes a first subgrade 1, a field base surface 2, an embedded connection module 3, a prefabricated baffle 4, a second subgrade 5, an integrated processing component 6, and an elastic adjustable tensioning component 7.

[0032] According to Figures 1-3A specific embodiment is shown. A first roadbed 1 is laid on the field base surface 2. An embedded connection module 3 is embedded on the double-layer step 11 opened on one side of the first roadbed 1. A prefabricated forming baffle 4 is also supported on the field base surface 2. A second roadbed 5 that wraps the embedded connection module 3 and is flush with the first roadbed 1 is filled between the prefabricated forming baffle 4 and the side of the first roadbed 1 where the double-layer step 11 is opened. An integrated processing component 6 that is slidably connected to the prefabricated forming baffle 4 is also provided above the second roadbed 5. The prefabricated forming baffle 4 and the first roadbed 1 are also connected by a horizontally inserted elastic adjustable tensioning component 7 to limit the distance, so as to limit the lateral outer dimension of the second roadbed 5. The embedded connection module 3 provided in this application can perform multi-directional plugging of the steel cage it constructs with the original first roadbed 1. Therefore, the second roadbed 5 that pours and wraps the steel cage constructed by the embedded connection module 3 can ensure the connection stability strength with the first roadbed through the multi-directional pulling and positioning of the steel bars. In particular, the horizontal and vertical plugging and matching can synergistically improve the anti-deformation ability and evenly decompose the force during rolling, thereby improving the connection precision and stability. The elastic adjustable tensioning component 7 provided in this application can always maintain the distance between the prefabricated forming baffle 4 and the first roadbed 1 by adjusting the pulling strength, thereby effectively limiting the relative positions of the prefabricated forming baffle 4, the second roadbed 5, and the first roadbed 1 and ensuring the firmness of the splicing of the three.

[0033] Preferably, a double-layer step 11 that can cooperate with the prefabricated forming baffle 4 to define a pouring cavity is opened on the side of the first roadbed 1, so that the second roadbed 5 is formed by pouring concrete between the two. Preferably, the upper vertical surface 111 and the lower vertical surface 113 are located at two opposite side edges of the stepped plane 112, so as to form a splicing stepped surface in cooperation. Further preferably, a number of inverted ladder grooves 114 are opened on the stepped plane 112 of the double-layer step 11. This application improves the surface area by setting the upper vertical surface 111, the stepped plane 112, and the lower vertical surface 113 of the double-layer step 11, thereby increasing the contact area between the casting body and the existing first roadbed 1, and improving the connection strength and effectiveness between the two by increasing the contact area. The inverted ladder grooves 114 provided in this application can further increase the contact area between the first roadbed 1 and the second roadbed 5, and improve the stability after connection by expanding the docking form between the two. In particular, the inverted ladder grooves 114 and the concrete poured in the inverted ladder grooves 114 can limit the lateral splitting force when the two have different strength settlements, thereby improving the docking stability, reducing the possibility that the second roadbed 5 undergoes excessive settlement and tilts relative to the first roadbed, resulting in cracks at the connection between the two, and greatly improving the connection stability and lateral pulling deformation strength.

[0034] Preferably, the embedded module 3 includes a first steel bar 31 partially inserted into the upper vertical surface 111 of the double-layer step 11, a second steel bar 32 partially inserted into the step plane 112 of the double-layer step 11 vertically, and a third steel bar 33 partially inserted into the lower vertical surface 113 of the double-layer step 11. Further preferably, the second steel bar 32 is inserted between two inverted ladder grooves 114 arranged side by side. Preferably, the end of the first steel bar 31 away from the upper vertical surface 111 is connected to the end of the second steel bar 32 away from the step plane 112 through the longitudinal steel bar 34. Further preferably, the longitudinal steel bar 34 is also connected to the third steel bar 33 through the interlocking steel bars 35 arranged at intervals in the axial direction thereof, so as to form a steel cage body plugged into the double-layer step 11 at multiple points. Preferably, the interlocking steel bar 35 is further provided with a first reinforcing steel bar 36 on the side away from the first roadbed 1. Preferably, a second reinforcing steel bar 37 connected to the first steel bar 31 or the interlocking steel bar 35 is also inserted in the inverted ladder groove 114. The embedded module 3 provided in the present application is multi-directionally plugged into the steel cage it constructs with the original first roadbed 1, so that the second roadbed 5 cast and wrapped with the steel cage constructed by the embedded module 3 can ensure the stability of the connection with the first roadbed through the multi-directional pulling positioning of the steel bars, especially the transverse and longitudinal insertion cooperation can synergistically enhance the anti-deformation ability and improve the balanced decomposition of force during rolling, thereby improving the precision and stability of the connection.

[0035] Preferably, the prefabricated forming baffle 4 includes a main body 41, a supporting slope body 42, a connecting plate 43 and an extended ground nail 44. Preferably, a supporting slope body 42 is provided on the side of the main body 41 away from the first roadbed 1. Further preferably, a connecting plate 43 parallel to the solid foundation surface 2 is connected to the side of the supporting slope body 42 away from the main body 41. Specifically, a plurality of openings 431 are provided at intervals in the plate body of the connecting plate 43. Preferably, an extended ground nail 44 that penetrates into the solid foundation surface 2 is inserted into the opening 431. Preferably, a slide groove 411 is also provided on the side of the main body 41 away from the first roadbed 1. The prefabricated forming baffle 4 provided in the present application can ensure the morphological contour of the second roadbed 5 by limiting and shaping, so as to assist in completing the effective forming and pouring, and at the same time can improve the stability of the second roadbed 5 on the solid foundation surface 2, so as to ensure that it is not prone to defects such as edge collapse during use. The supporting slope body 42 provided by itself can improve the lateral supporting strength, so as to more effectively ensure the structural stability of the second roadbed 5 when under pressure, and avoid its collapse due to the settlement of the marginal strata. The main body 41, the supporting slope body 42, and the connecting plate 43 are effectively connected to the actual base surface 2 through the extended ground nails 44 that penetrate the connecting plate 43, thereby ensuring the stability of the connection and the accuracy of the positioning.

[0036] Preferably, the integrated processing component 6 includes a mounting plate 61, a pulley set 62, a shock-absorbing guide wheel 63, a leveling inclined plate 64, a vibration unit 65 and a lifting frame 66. Preferably, the pulley set 62 for supporting the mounting plate 61 is slidably connected in the chute 411. Preferably, a shock-absorbing guide wheel 63 located on the first roadbed 1 is further provided on one side of the mounting plate 61 away from the pulley set 62. A leveling inclined plate 64 capable of leveling the concrete for constructing the second roadbed 5 is provided on the lower surface of the mounting plate 61. A lifting frame 66 capable of lifting and inserting the vibration unit 65 into the second roadbed 5 is supported on the upper surface of the mounting plate 61. The integrated processing component 6 provided in this application can slide along the road extension direction relative to the main board body 41, so that the leveling inclined plate 64 of the integrated processing component 6 can scrape the surface of the concrete in the casting cavity where the concrete pouring is completed during the directional translation, making the upper plane of the formed second roadbed 5 flush with the surface of the first roadbed. In addition, the vibration unit 65 provided in front of the movement of the leveling inclined plate 64 can penetrate into the concrete for vibration defoaming and evacuation treatment, thereby ensuring the filling saturation of the concrete forming the second roadbed 5.

[0037] Preferably, the pulley set 62 includes side plates 621, pulleys 622, rotating shafts 623, and elastic support rods 624. Preferably, the pulleys 622 are arranged at intervals on the side plates 621 through the rotating shafts 623. Preferably, the pulleys 622 are slidably connected in the chute 411. Further preferably, the side plates 621 are connected to the mounting plate 61 through the elastic support rods 624. Preferably, the elastic support rod 624 includes a rod, a sleeve, and a shock-absorbing spring body that defines the length of the rod inserted into the sleeve. Further preferably, the shock-absorbing solution of the shock-absorbing guide wheel 63 adopts a similar buffer shock-absorbing structure. The pulley set 62 provided in this application limits and supports the mounting plate 61 by inserting from the end of the chute 411, and at the same time facilitates the translation of the mounting plate 61 according to requirements to complete the leveling and defoaming and filling processing of the concrete.

[0038] Preferably, the elastically adjustable tensioning assembly 7 includes a first baffle 71, a threading cable 72, a connecting screw 73, a strong tension spring 74, a positioning plate 75, and an adjusting nut 76. Preferably, the threading cable 72 is inserted into the preformed baffle 4 and the first roadbed 1. Further preferably, both ends of the threading cable 72 penetrate through the first baffle 71 that is abutted against the surfaces of the preformed baffle 4 and the first roadbed 1 and are connected to the connecting screw 73. Preferably, a strong tension spring 74 is further sleeved on a partial section of the threading cable 72 that is connected to the connecting screw 73. Preferably, the connecting screw 73 is threadedly inserted into the positioning plate 75. Preferably, an adjusting nut 76 is further provided on the rod body that penetrates through the positioning plate 75. Preferably, the connecting screw 73 includes a rope sleeve, a rotating connecting collar, and a screw. The rope sleeve is rotatably connected to the round head end of the screw through the transmission connecting collar. The elastically adjustable tensioning assembly 7 provided in the present application can always maintain the distance between the preformed baffle 4 and the first roadbed 1 by adjusting the pulling strength, thereby effectively defining the relative positions of the preformed baffle 4, the second roadbed 5, and the first roadbed 1, ensuring the firmness of the splicing of the three. In particular, the pulling relaxation caused by stress fatigue can be eliminated by regularly adjusting the pulling strength, and the vibration impact during the use of the splicing structure can be buffered by an elastic limiting method to ensure the stability of the splicing. The threading cable 72 provided in the present application sequentially penetrates through the preformed baffle 4, the second roadbed, and the first roadbed 1, thereby realizing the limiting of the connection of the three. In particular, both ends of the threading cable 72 cooperate with the first baffle 71, the connecting screw 73, the strong tension spring 74, the positioning plate 75, and the adjusting nut 76 to realize the adjustable pulling clamping strength and elastic limiting, so as to ensure the firmness and stability of the limiting, especially the stability of the relative position after assembly, further avoiding the generation of splicing cracks, effectively resisting the separation force caused by uneven stress and different settlement strengths, improving the connection stability and tightness, and reducing the risk of cracking or collapse at the joint.

[0039] The working principle of the present application is as follows:

[0040] When widening a road, the ground on one side of the original first roadbed 1 is excavated to expose the relatively hard in-situ base surface 2. According to the size of the second roadbed 5 to be poured as required, the prefabricated formwork 4 is positioned and installed on the in-situ base surface 2. Then, a double-layer step 11 is formed on the side of the first roadbed 1 close to the prefabricated formwork 4. Reinforcing bars are inserted by drilling holes in different areas of the double-layer step 11, and a pouring receiving groove is constructed. The reinforcing bars inserted in several different directions are connected to construct a reinforcing cage body. Concrete is poured according to requirements. After the pouring is completed, the surface of the concrete is leveled and tamped to remove air bubbles through the integrated processing component 6, so as to ensure the structural stability of the second roadbed 5 and the flush expansion with the first roadbed 1. An elastic adjustable tensioning component 7 is penetrated through the expanded roadbed formed by the prefabricated formwork 4, the second roadbed, and the first roadbed 1, so that during subsequent use, according to the use state and the use duration, the intensity of the pulling and clamping force provided by the elastic adjustable tensioning component 7 can be adjusted, thereby ensuring the firmness and tightness of the connection.

[0041] The present utility model is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present utility model, they shall fall within the protection scope of the present utility model. Those skilled in the art should understand that the description and drawings of the present utility model are illustrative and do not constitute a limitation on the claims. The protection scope of the present utility model is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional manner and should not be understood as being necessarily provided. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A highway widening and splicing roadbed structure, comprising a solid base surface (2) on which a first roadbed (1) is laid, characterized in that: A double-layer step (11) is provided on the side of the first roadbed (1), and an embedded module (3) is embedded on the double-layer step (11); A prefabricated shaped baffle (4) is also supported on the solid foundation surface (2), and a second roadbed (5) covering the embedded module (3) and flush with the first roadbed (1) is filled between the prefabricated shaped baffle (4) and the first roadbed (1); An integrated processing assembly (6) is also provided above the second roadbed (5) and is slidably connected to the prefabricated forming baffle (4); The prefabricated formed baffle plate (4) and the first roadbed (1) are also connected to each other at a limited distance via a transversely inserted elastically adjustable tensioning component (7).

2. The highway widening and splicing roadbed structure according to claim 1, characterized in that: The embedded module (3) comprises a first steel bar (31) partially inserted transversely into the upper vertical surface (111) of the double-layer step (11), a second steel bar (32) partially inserted vertically into the step plane (112) of the double-layer step (11), and a third steel bar (33) partially inserted transversely into the lower vertical surface (113) of the double-layer step (11); An end of the first steel bar (31) away from the upper vertical surface (111) is connected to an end of the second steel bar (32) away from the stepped plane (112) via a longitudinal steel bar (34); The longitudinal steel bars (34) are also connected to the third steel bars (33) via interlocking steel bars (35) arranged at intervals in the axial direction thereof.

3. The highway widening and splicing roadbed structure according to claim 2, characterized in that: The upper vertical surface (111) and the lower vertical surface (113) are located at two opposite side edges of the step plane (112), thereby cooperating with each other to form an assembled step surface; A plurality of inverted ladder grooves (114) are provided on the step plane (112) of the double-layer step (11), and the second steel bars (32) are inserted between adjacent inverted ladder grooves (114).

4. The highway widening and splicing roadbed structure according to claim 3, characterized in that: The prefabricated baffle (4) comprises a main plate body (41), a supporting slope body (42) and a connecting plate (43), wherein: A supporting slope body (42) is provided on a side of the main body (41) away from the first roadbed (1), and a side of the supporting slope body (42) away from the main body (41) is connected to the connecting plate (43) parallel to the solid foundation surface (2).

5. The highway widening and splicing roadbed structure according to claim 4, characterized in that: A plurality of openings (431) are arranged at intervals in the plate body of the connection plate (43), and extended ground nails (44) that penetrate deeply into the solid foundation surface (2) are inserted into the openings (431).

6. The highway widening and splicing roadbed structure according to claim 5, characterized in that: A sliding groove (411) is also provided on a side of the main body (41) away from the first roadbed (1). The integrated processing assembly (6) is used to support the pulley group (62) of the mounting plate (61) to slide in the slide groove (411).

7. The highway widening and splicing roadbed structure according to claim 6, characterized in that: A shock-absorbing guide wheel (63) located on the first roadbed (1) is also provided on the side of the mounting plate (61) away from the pulley block (62). The lower surface of the mounting plate (61) is provided with a leveling inclined plate (64) capable of leveling the concrete for constructing the second roadbed (5). The upper surface of the mounting plate (61) supports a lifting frame (66) capable of inserting the vibration unit (65) into the second roadbed (5) in a liftable manner.

8. The highway widening and splicing roadbed structure according to claim 7, characterized in that: The pulley block (62) comprises a side plate (621), a pulley (622), a rotating shaft (623), and an elastic support rod (624), wherein: The pulleys (622) are inserted on the side plates (621) at intervals through the rotating shafts (623); The pulley (622) is tracked in the slide groove (411); The side plate (621) is connected to the mounting plate (61) via the elastic support rod (624).

9. The highway widening and splicing roadbed structure according to claim 8, characterized in that: The elastically adjustable tensioning assembly (7) comprises a first baffle (71), a threaded cable (72), a connecting screw (73), a strong tensioning spring (74), a positioning plate (75) and an adjusting nut (76). The threading cable (72) is inserted in the prefabricated shaped baffle (4) and the first roadbed (1), and its two ends pass through the first baffle (71) abutting against the surface of the prefabricated shaped baffle (4) and the first roadbed (1) and are connected to the connecting screw (73); The strong tension spring (74) is also sleeved on the section where the threading cable (72) is connected to the connecting screw (73); The connecting screw rod (73) is threadedly inserted into the positioning plate (75), and the adjusting nut (76) is also arranged on the rod body that passes through the positioning plate (75).

10. The highway widening and splicing roadbed structure according to claim 9, characterized in that: A first reinforcing steel bar (36) is further provided on a side of the interlocking steel bar (35) away from the first roadbed (1); A second reinforcing steel bar (37) connected to the first steel bar (31) or the interlocking steel bar (35) is also inserted in the inverted ladder groove (114).

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