A municipal road widening anti-cracking structure and a construction method thereof

Abstract

The application belongs to the technical field of geological exploration sampling equipment, in particular to a municipal road widening anti-cracking structure and a construction method thereof, which comprises an old roadbed and a new roadbed, the new roadbed is overlapped with the old roadbed, and the old roadbed and the new roadbed each comprise, from bottom to top, a soil base layer, a sandstone layer, a concrete layer and an asphalt layer; further comprising an overlapping assembly, the overlapping assembly is installed between the old roadbed and the new roadbed, and is used for enhancing the connection tightness between the old roadbed and the new roadbed; in the process of road widening, the overlapping assembly is used for clamping the end of the grid net through the overlapping plate and the old roadbed, and is used for inclined fixing through the insertion rod, so that in subsequent use, the overlapping plate has a large surface area, and when the new roadbed and the old roadbed have a cracking trend, the displacement of the overlapping plate has a large acting area on the new roadbed and the old roadbed, so that the cracking probability is reduced.

Description

Technical Field

[0001] This invention belongs to the field of municipal road structure technology, specifically a municipal road widening and crack prevention structure and its construction method. Background Technology

[0002] Road traffic is an important infrastructure for urban development. With the advancement of urbanization and the increase in traffic flow, traffic congestion has become increasingly serious. Widening existing roads and adding driving lanes is one of the effective ways to alleviate traffic congestion.

[0003] When widening existing roads, the new and old roads are spliced ​​together as a whole. After the widened road is built, due to differences in the geological conditions of the soil base of the new and old roadbeds, differences in settlement, errors in the compaction degree and moisture content of the filling materials in the widened part, as well as improper treatment of the connection between the new and old roads and drainage problems, longitudinal cracks are prone to occur between the new and old roads. In road design, the phenomenon of road cracks is usually dealt with by prevention first and then repair. Therefore, in the road widening design, it is necessary to prevent the phenomenon of cracks between the new and old roads, so as to extend the service life of the widened road.

[0004] In related technologies, to prevent longitudinal cracks in widened roads, a crack-prevention structure and construction method for widened municipal roads have been disclosed (publication number CN116180536A). This scheme involves setting a connection point connected to the widening opening on the initial concrete layer, installing multiple evenly distributed inserts within the connection point and the widening opening, and a working net spanning the connection point and the widening opening. Combined with the pouring of coarse and fine stone layers at the widening and connection openings for joint support, this effectively balances the forces on the original road and the widened road, preventing breakage and greatly ensuring the safety of vehicles and pedestrians. However, in actual experiments, it was found that in the paved road, the slots are opened on the existing road, and the inserts are inserted into the slots. When the force is distributed, the working net and inserts connect the old and new roads. When the working net is under stress, the force is applied to the inserts, causing the tensile force to be concentrated on the old road. Since the old road has already been damaged when the slots are opened, the probability of longitudinal cracking of the road from the location of the slot increases under tensile force, making it difficult to distribute the force.

[0005] In view of this, the present invention proposes a crack-prevention structure for widening municipal roads and its construction method to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a municipal road widening and crack prevention structure and its construction method.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a municipal road widening and crack prevention structure of the present invention, comprising an old roadbed and a new roadbed, wherein the new roadbed overlaps with the old roadbed, and both the old roadbed and the new roadbed comprise, from bottom to top, a soil base layer, a sand and gravel layer, a concrete layer and an asphalt layer.

[0008] It also includes an overlap assembly, which is installed between the old roadbed and the new roadbed, and the overlap assembly is used to enhance the tightness of the connection between the old roadbed and the new roadbed;

[0009] The overlapping assembly includes a plug, an overlapping plate, and a grid.

[0010] The overlapping plate is fixedly installed between the new roadbed and the old roadbed, and the overlapping plate has evenly distributed positioning holes;

[0011] The insertion rod is a T-shaped structure, and the insertion rod extends obliquely into the old roadbed through the positioning hole;

[0012] The grid is installed between the old roadbed and the overlapping plate, and the grid extends into the new roadbed.

[0013] Preferably, overlapping trenches are provided on the old roadbed, and multiple overlapping trenches are distributed in a stepped shape. The overlapping plates are all installed in the overlapping trenches, and the grid is fixed to the overlapping trenches by asphalt bonding.

[0014] Preferably, the overlapping plates are all made of angle steel, and reinforcing ribs are fixedly installed on the overlapping plates. The insert rods correspond one-to-one with the reinforcing ribs, and the insert rods pass through the reinforcing ribs.

[0015] Preferably, it also includes a reinforcement component, which is installed on the new roadbed and is used to enhance the connection strength between the old roadbed and the new roadbed;

[0016] The reinforcement components include a curbstone, a curbstone backrest, and a pressure-increasing block. A filling groove is provided on the side of the new roadbed away from the old roadbed. The filling groove extends to the junction of the concrete layer and the asphalt layer. The curbstone and the curbstone backrest are installed in the filling groove. A pressure-increasing cavity is formed between the curbstone and the curbstone backrest. A pressure-increasing block is slidably installed in the pressure-increasing cavity. Both the pressure-increasing cavity and the pressure-increasing block are wedge-shaped structures. The pressure-increasing block applies lateral pressure to the curbstone and the curbstone backrest.

[0017] Preferably, a protective plate is fixedly installed at the bottom of the curb backrest. The protective plate is fixed to the new roadbed concrete layer by bolts. The side of the new roadbed away from the old roadbed is designed as a slope. The protective plate extends to the edge of the new roadbed to shield the new roadbed.

[0018] Preferably, the protective plate is made of multiple metal plates spliced ​​together, and a concrete shell is cast on the outside of the protective plate. The end of the grid away from the overlapping plate is fixedly connected to the protective plate by bolts.

[0019] Preferably, each of the multiple layers of the grid is fixedly installed with support rods, and two adjacent support rods are connected end to end. Each support rod consists of a rod body, a connecting end, and a clamping plate. The rod body is a tubular structure with open ends. The connecting end is threaded to the inner wall of the rod body. A clamping plate is fixedly installed on the connecting end by bolts. The grid extends between the clamping plate and the connecting end.

[0020] Preferably, an injection tube is fixedly installed on the grid, the injection tube is made of hollow steel pipe, the injection tube penetrates the protective plate, and the injection tube has uniformly distributed injection holes.

[0021] Preferably, the rod body has evenly distributed permeable holes, the clamp plate and the connecting end both have a hollow design, the inner cavity of the rod body is filled with filler, a drain pipe is installed in the sand and gravel layer, the drain pipe penetrates the protective plate, and the drain pipe is filled with filler.

[0022] A construction method for a crack-prevention structure for widening municipal roads, the method comprising the following steps:

[0023] S1. Preparation Phase: Workers measure and plan the old roadbed according to the construction drawings, accurately marking the construction location, and simultaneously transporting construction equipment and materials to the construction site.

[0024] S2. Assembly stage: Workers excavate and repair the old roadbed according to the construction process, and install the overlapping components one by one in the overlapping trench after the trench is opened.

[0025] S3. Widening stage: Workers widen the road according to the construction process, building the soil base, gravel layer, concrete layer and asphalt layer layer by layer, and combining the reinforcement components with it during the construction process.

[0026] S4. Maintenance phase: During the long-term use of the widened road, the widened road should be monitored in a timely manner, and any cracks that appear in the road should be repaired promptly.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The present invention discloses a municipal road widening and crack prevention structure and its construction method. By setting up overlapping components, during the road widening process, the overlapping plate first clamps the ends of the grid with the old roadbed and fixes them at an angle with the insertion rods. Therefore, in subsequent use, the overlapping plate takes advantage of its large surface area. When there is a tendency for cracking between the new and old roadbeds, the displacement of the overlapping plate has a large effect area on the new and old roadbeds, thus reducing the degree of cracking. Secondly, when fixing the grid, the old roadbed and the overlapping plate form a surface clamp, which increases the fixing area of ​​the grid on the one hand and reduces the number of insertion rods used on the other hand. Therefore, the damage to the old roadbed is small, and the probability of cracking of the old roadbed itself can be reduced under the tensile force in the later stage.

[0029] 2. The municipal road widening and crack prevention structure and its construction method described in this invention involve placing a pressure-increasing block between the curb and the curb backrest through a pressure-increasing cavity. Since both the pressure-increasing cavity and the pressure-increasing block are wedge-shaped structures, the pressure-increasing block tends to move downwards under the action of gravity, thereby causing the curb and the curb backrest to tend to separate from each other. Combined with the weight of the curb itself, this creates pressure on the asphalt layer, thereby reducing the probability of cracking between the new and old roadbeds during subsequent use. Attached Figure Description

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] Figure 1 This is a perspective view of the present invention;

[0032] Figure 2 This is a three-dimensional view of the old roadbed in this invention;

[0033] Figure 3 It is a 3D diagram of the overlapping components;

[0034] Figure 4 yes Figure 3 Enlarged view of a portion of point A in the middle;

[0035] Figure 5 It is a 3D assembly diagram of the overlapping components and support rods;

[0036] Figure 6 This is a partial structural diagram of the present invention;

[0037] Figure 7 This is a cross-sectional view of the present invention;

[0038] Figure 8 yes Figure 7 A magnified view of a section at point B in the middle;

[0039] Figure 9 This is a sectional view of the support rod;

[0040] Figure 10 This is a flowchart of the method of the present invention;

[0041] In the diagram: 1. Old roadbed; 11. New roadbed; 2. Insert pole; 21. Overlap plate; 22. Grid mesh; 23. Positioning hole; 24. Overlap trench; 25. Reinforcing bar; 3. Curbstone; 31. Curbstone backing; 32. Pressure block; 33. Filling groove; 34. Pressure chamber; 4. Protective plate; 41. Support rod; 42. Rod body; 43. Connecting end; 44. Clamping plate; 45. Water permeable hole; 5. Glue injection pipe; 6. Drainage pipe. Detailed Implementation

[0042] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0043] like Figures 1 to 10 As shown, the municipal road widening and crack prevention structure of the present invention includes an old roadbed 1 and a new roadbed 11. The new roadbed 11 overlaps with the old roadbed 1. Both the old roadbed 1 and the new roadbed 11 include a soil base layer, a sand and gravel layer, a concrete layer and an asphalt layer from bottom to top. The new roadbed 11 and the old roadbed 1 adopt the same layer structure. During the construction process, the new roadbed 11 is compacted layer by layer, which can effectively reduce the settlement difference between the new roadbed 11 and the old roadbed 1 during subsequent use.

[0044] It also includes an overlapping assembly, which is installed between the old roadbed 1 and the new roadbed 11. The overlapping assembly is used to enhance the tightness of the connection between the old roadbed 1 and the new roadbed 11. The overlapping assembly includes a plug 2, an overlapping plate 21 and a grid 22. The overlapping plate 21 is fixedly installed between the new roadbed 11 and the old roadbed 1. The overlapping plate 21 has evenly distributed positioning holes 23. The overlapping plate 21 is a plate-shaped structure. It is installed between the new roadbed 11 and the old roadbed 1, and its surface area increases the contact area with the old roadbed 1 and the new roadbed 11. The positioning holes 23 on its surface are used to position the plug 2, reducing the number of manual measurement operations in the subsequent installation process.

[0045] The insertion rod 2 is a T-shaped structure. The insertion rod 2 extends obliquely into the old roadbed 1 through the positioning hole 23. The grid 22 is installed between the old roadbed 1 and the overlapping plate 21. The grid 22 extends into the new roadbed 11. The insertion rod 2 extends obliquely into the old roadbed 1, and the grid 22 is fixedly installed between the old roadbed 1 and the overlapping plate 21. The overlapping plate 21 is used to increase the fixed area of ​​the grid 22.

[0046] Specifically, during the actual operation, workers followed the planned construction scheme, first excavating the sidewall of the old roadbed 1 to remove humus, debris, etc., to provide sufficient space for the new roadbed 11. Then, workers installed the overlapping components transported to the construction site. During installation, the insert rod 2 was first inserted into the positioning hole 23 on the overlapping plate 21. Then, the grid mesh 22 was suspended on the side of the overlapping plate 21 near the old roadbed 1. With the assistance of tools and equipment, the insert rod 2 was pressed into the old roadbed 1 until the end of the insert rod 2 was tightly against the overlapping plate 21. It should be noted that the diameter of the end of the insert rod 2 is larger than the diameter of the positioning hole 23, therefore the overlap... Plate 21 can limit the insertion rod 2. After multiple overlapping components are installed, the new roadbed 11 can be constructed. When constructing the new roadbed 11, the excavated trench needs to be backfilled first, and the backfilled soil needs to be compacted repeatedly to form a soil base. Then, on the basis of the soil base, the sand and gravel layer, concrete layer and asphalt layer are constructed in sequence. During the construction of the new roadbed 11, the grid mesh 22 on the assembly components is pulled horizontally one by one. During the formation of the new roadbed 11, multiple grid meshes 22 are dispersed in the new roadbed 11, so that the new roadbed 11 and the old roadbed 1 are combined under the action of the overlapping components.

[0047] This invention, by setting up an overlapping assembly, firstly clamps the end of the grid 22 by cooperating with the old roadbed 1 during the road widening process through the overlapping plate 21, and then fixes it at an angle with the insertion rod 2. Therefore, in subsequent use, the overlapping plate 21 takes advantage of its large surface area. When there is a tendency for cracking between the new roadbed 11 and the old roadbed 1, the displacement of the overlapping plate 21 has a large effect area on the new roadbed 11 and the old roadbed 1, thus reducing the degree of cracking. Secondly, when fixing the grid 22, the old roadbed 1 and the overlapping plate 21 form a surface clamp, which increases the fixing area of ​​the grid 22 on the one hand, and reduces the number of insertion rods 2 used on the other hand. Therefore, the damage to the old roadbed 1 is small, and the probability of the old roadbed 1 cracking itself under the tensile force in the later stage can be reduced.

[0048] In a preferred embodiment of the present invention, overlapping grooves 24 are provided on the old roadbed 1. Multiple overlapping grooves 24 are distributed in a stepped shape. The overlapping plates 21 are all installed in the overlapping grooves 24. The grid 22 is fixed to the overlapping grooves 24 by asphalt bonding. The stepped distribution of the overlapping grooves 24 increases the contact area between the new roadbed 11 and the old roadbed 1. Furthermore, the contact position between the new roadbed 11 and the old roadbed 1 is set in a stepped shape. In the vertical direction, the proportion of the new roadbed 11 increases with the distance from the old roadbed 1. This results in a gradual transition between the new roadbed 11 and the old roadbed 1. In subsequent use, when there is a settlement difference between the new roadbed 11 and the old roadbed 1, the transitional distribution can reduce the degree of settlement difference change, thereby reducing the probability of crack formation. On the other hand, the presence of the overlapping grooves 24 also enhances the ease of installation of the overlapping components and further disperses the multiple sets of plugs 2.

[0049] In a preferred embodiment of the present invention, the overlapping plates 21 are all made of angle steel, and reinforcing ribs 25 are fixedly installed on the overlapping plates 21. The insert rods 2 correspond one-to-one with the reinforcing ribs 25, and the insert rods 2 pass through the reinforcing ribs 25. In order to cooperate with the overlapping grooves 24, the overlapping plates 21 are made of angle steel, and reinforcing ribs 25 are installed on the overlapping plates 21. By utilizing the stability of triangles, the probability of deformation of the overlapping plates 21 is reduced, thereby enhancing the fixing effect on the grid 22. At the same time, the setting of the reinforcing ribs 25 also makes it easier to open the positioning holes 23, and the positioning holes 23 have a certain depth, which effectively enhances the guiding and limiting function of the insert rods 2.

[0050] In a preferred embodiment of the present invention, a reinforcement component is further included. This reinforcement component is installed on the new roadbed 11 and is used to enhance the connection strength between the old roadbed 1 and the new roadbed 11. The reinforcement component includes a curbstone 3, a curbstone backrest 31, and a pressure-increasing block 32. A filling groove 33 is formed on the side of the new roadbed 1 away from the old roadbed 1, extending to the junction of the concrete layer and the asphalt layer. The curbstone 3 and the curbstone backrest 31 are installed within the filling groove 33, forming a pressure-increasing cavity 34 between the curbstone 3 and the curbstone backrest 31. A pressure-increasing block 32 is slidably installed within the pressure-increasing cavity 34. Both the pressure-increasing cavity 34 and the pressure-increasing block 32 are wedge-shaped structures. The pressure-increasing block 32 applies lateral pressure to the curbstone 3 and the curbstone backrest 31. To further reduce cracks between the new roadbed 11 and the old roadbed 1, the new roadbed 11 is constructed with... After completion, a filling trench 33 is excavated on the side of the new roadbed 11 away from the old roadbed 1. The filling trench 33 penetrates the asphalt layer and extends to the junction of the asphalt layer and the concrete layer. Then, a curbstone 3 and a curbstone backing 31 are placed in the filling trench 33. The sidewall of the curbstone 3 is in close contact with the sidewall of the asphalt layer. A pressure-increasing cavity 34 is formed between the curbstone backing 31 and the curbstone 3. With the assistance of a crane, a pressure-increasing block 32 is placed between the curbstone 3 and the curbstone backing 31 through the pressure-increasing cavity 34. Since both the pressure-increasing cavity 34 and the pressure-increasing block 32 are wedge-shaped structures, the pressure-increasing block 32 tends to move downwards under the action of gravity, which in turn causes the curbstone 3 and the curbstone backing 31 to tend to separate from each other. Combined with the weight of the curbstone 3 itself, this creates pressure on the asphalt layer, thereby reducing the probability of cracking between the new roadbed 11 and the old roadbed 1 during subsequent use.

[0051] In a preferred embodiment of the present invention, a protective plate 4 is fixedly installed at the bottom of the curb backrest 31. The protective plate 4 is bolted to the concrete layer of the new roadbed 11. The side of the new roadbed 11 away from the old roadbed 1 is designed as a slope. The protective plate 4 extends to the edge of the new roadbed 11 to shield it. The protective plate 4 is fixedly installed on the concrete layer of the new roadbed 11 and secured with bolts. Then, the curb backrest 31 is fixed to the protective plate 4, so that the curb backrest 31 is fixed to the new roadbed 11. The concrete layer of the base 11 is stably bonded. When the pressure block 32 compresses the curb stone 3 and the curb stone backing 31, the pressure can be concentrated towards the curb stone 3 under the condition that the curb stone backing 31 is stably installed. This can enhance the pressure on the new base 11 and the old base 1, reduce the probability of cracks. At the same time, the protective plate 4 extends to the edge of the new base 11 and forms a shield on the edge of the new base 11, which reduces the probability of lateral flow of the filling materials of each layer of the new base 11, thereby delaying the settlement of the new base 11.

[0052] In a preferred embodiment of the present invention, the protective plate 4 is composed of multiple metal plates spliced ​​together. The outer side of the protective plate 4 is cast with a concrete shell. The end of the grid 22 away from the overlapping plate 21 is fixedly connected to the protective plate 4 by bolts. When constructing the new roadbed 11, the bottommost protective plate 4 is fixed first. Then, filling and compacting filling material is poured between the protective plate 4 and the old roadbed 1. When the height of the filling material is level with the height of the grid 22, the grid 22 is fixedly connected to the end of the protective plate 4 by bolts. Then, the filling material is compacted again. In this process, the combination of the protective plate 4 and the grid 22 can limit the side wall of the filling material. With the help of the compaction equipment, the compaction effect of the filling material is effectively enhanced. At the same time, after the new roadbed 11 is built, since the grid 22 is fixed at both ends, the grid 22 can play a certain supporting role, further reducing the settlement of each layer of the new roadbed 11.

[0053] In a preferred embodiment of the present invention, support rods 41 are fixedly installed on each of the multiple layers of grid 22. Adjacent support rods 41 are connected end-to-end. Each support rod 41 consists of a rod body 42, a connecting end 43, and a clamping plate 44. The rod body 42 is a tubular structure with open ends. The connecting end 43 is threaded to the inner wall of the rod body 42. The clamping plate 44 is fixedly installed on the connecting end 43 by bolts. The grid 22 extends between the clamping plate 44 and the connecting end 43. The support rods 41 create a three-dimensional structure for the multiple layers of grid 22. After the new roadbed 11 is put into use, the three-dimensional network structure effectively enhances the support effect on each layer of the new roadbed 11 material, reducing the settlement degree of each layer of filling material in the new roadbed 11. The composition of the support rods 41 also enhances the ease of installation. Specifically, before the bottom soil layer is compacted, the rod body 42 is inserted into the soil, and then the soil layer is compacted until the soil layer and the rod body are compacted. With the top of 42 aligned, unfold the corresponding grid 22, remove the clamps 44 from each support rod 41, and then use the clamps 44 and connecting ends 43 to hold the grid 22. With the aid of tools, twist the connecting ends 43 into the inner cavity of the rod 42, so that the connecting ends 43 and clamps 44 pull the grid 22. Combined with the connection between the grid 22 and the protective plate 4, the laid grid 22 is in a taut state. When laying multiple layers, align the two adjacent support rods 41 and fix the two support rods 42 under the pressure of the surrounding filling material. This allows the two adjacent support rods 41 to transmit force in the vertical direction. Since the support rods 41 are evenly distributed, there are many fixing points for the grid 22. On the one hand, this enhances the support effect of the grid 22 on the filling material during subsequent use. On the other hand, since the grid 22 is fixed at multiple points, even if the grid 22 is partially damaged, it can still provide a certain support effect.

[0054] A glue injection pipe 5 is fixedly installed on the grid 22. The glue injection pipe 5 is made of hollow steel pipe and penetrates the protective plate 4. The glue injection pipe 5 has evenly distributed glue injection holes. During the construction of the grid 22, the glue injection pipe 5 is placed below the grid 22 and the end of the glue injection pipe 5 penetrates the protective plate 4, so that the glue injection pipe 5 can cooperate with the grid 22 to support the filling material. On the other hand, after the new roadbed 11 is completed and before the operation stage, after a period of settlement, the workers pump highly permeable fillers, such as highly permeable emulsified asphalt, into the new roadbed 11 through the glue injection pipe 5, so that it slowly penetrates into the new roadbed 11. This can effectively seal the pores between the filling materials and pressurize the new roadbed 11, further reducing the settlement difference between the new roadbed 11 and the old roadbed 1 after it is put into use.

[0055] The pole body 42 has evenly distributed permeable holes 45. The clamping plate 44 and the connecting end 43 are both designed with a hollow shape. The inner cavity of the pole body 42 is filled with filler. A drainage pipe 6 is installed in the sand and gravel layer. The drainage pipe 6 penetrates the protective plate 4. The drainage pipe 6 is filled with filler. The clamping plate 44 and the connecting end 43 are both designed with a hollow shape. After the clamping plate 44 and the connecting end 43 move into the inner cavity of the pole body 42, filler is filled into the inner cavity of the pole body 42. The filler is permeable material such as gravel and sand. Together with the permeable holes 45 on the pole body 42 and the drainage pipe 6, multiple permeable channels are formed in the new roadbed 11, which facilitates the outflow of water that has seeped into the new roadbed 11 and reduces the damage of seepage water to the roadbed.

[0056] A construction method for a crack-prevention structure for widening municipal roads, the method comprising the following steps:

[0057] S1. Preparation Phase: Workers measure and plan the old roadbed 1 according to the construction drawings, accurately marking the construction location, and simultaneously transporting construction equipment and materials to the construction site.

[0058] S2. Assembly stage: The staff excavates and repairs the old roadbed 1 according to the construction process, and installs the overlapping components one by one in the overlapping trench 24 after the overlapping trench 24 is opened.

[0059] S3. Widening stage: Workers widen the road according to the construction process, building the soil base, gravel layer, concrete layer and asphalt layer layer by layer, and combining the reinforcement components with it during the construction process.

[0060] S4. Maintenance phase: During the long-term use of the widened road, the widened road should be monitored in a timely manner, and any cracks that appear in the road should be repaired promptly.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A municipal road widening and crack prevention structure, comprising an old roadbed (1) and a new roadbed (11), wherein the new roadbed (11) overlaps with the old roadbed (1), and both the old roadbed (1) and the new roadbed (11) comprise, from bottom to top, a soil base layer, a gravel layer, a concrete layer and an asphalt layer; Its features are: It also includes an overlap assembly, which is installed between the old roadbed (1) and the new roadbed (11) to enhance the tightness of the connection between the old roadbed (1) and the new roadbed (11); The overlapping assembly includes a plug (2), an overlapping plate (21), and a grid (22). The overlapping plate (21) is fixedly installed between the new roadbed (11) and the old roadbed (1), and the overlapping plate (21) is provided with evenly distributed positioning holes (23). The insertion rod (2) is a T-shaped structure, and the insertion rod (2) extends obliquely into the old roadbed (1) through the positioning hole (23); The grid (22) is installed between the old roadbed (1) and the overlapping plate (21), and the grid (22) extends into the new roadbed (11); It also includes a reinforcement component, which is installed on the new roadbed (11) and is used to enhance the connection strength between the old roadbed (1) and the new roadbed (11); The reinforcement components include a curbstone (3), a curbstone backrest (31), and a pressure block (32). A filling groove (33) is provided on the side of the new roadbed (11) away from the old roadbed (1). The filling groove (33) extends to the junction of the concrete layer and the asphalt layer. The curbstone (3) and the curbstone backrest (31) are installed in the filling groove (33). A pressure chamber (34) is formed between the curbstone (3) and the curbstone backrest (31). A pressure block (32) is slidably installed in the pressure chamber (34). Both the pressure chamber (34) and the pressure block (32) are wedge-shaped structures. The pressure block (32) applies lateral pressure to the curbstone (3) and the curbstone backrest (31). Each of the multi-layered grid (22) is fixedly equipped with a support rod (41), and two adjacent support rods (41) are connected end to end. The support rod (41) is composed of a rod body (42), a connecting end (43) and a clamping plate (44). The rod body (42) is a tubular structure with open ends. The connecting end (43) is threaded to the inner wall of the rod body (42). The clamping plate (44) is fixedly installed on the connecting end (43) by bolts. The grid (22) extends between the clamping plate (44) and the connecting end (43). The rod (42) has evenly distributed permeable holes (45), and the clamp (44) and the connecting end (43) are both provided with hollow design. The inner cavity of the rod (42) is filled with filler.

2. The municipal road widening and crack prevention structure according to claim 1, characterized in that: Overlapping trenches (24) are provided on the old roadbed (1). Multiple overlapping trenches (24) are distributed in a stepped shape. Overlapping plates (21) are installed in the overlapping trenches (24). The grid (22) is fixed to the overlapping trenches (24) by asphalt bonding.

3. The municipal road widening and crack prevention structure according to claim 2, characterized in that: The overlapping plates (21) are all made of angle steel. Reinforcing ribs (25) are fixedly installed on the overlapping plates (21). The insert rods (2) correspond one-to-one with the reinforcing ribs (25). The insert rods (2) pass through the reinforcing ribs (25).

4. The municipal road widening and crack prevention structure according to claim 1, characterized in that: The bottom of the curb back (31) is fixedly installed with a protective plate (4). The protective plate (4) is fixed to the concrete layer of the new roadbed (11) by bolts. The new roadbed (11) is designed with a slope on the side away from the old roadbed (1). The protective plate (4) extends to the edge of the new roadbed (11) to shield the new roadbed (11).

5. The municipal road widening and crack prevention structure according to claim 4, characterized in that: The protective plate (4) is made of multiple metal plates spliced ​​together. The outer side of the protective plate (4) is cast with a concrete shell. The end of the grid (22) away from the overlapping plate (21) is fixedly connected to the protective plate (4) by bolts.

6. The municipal road widening and crack prevention structure according to claim 5, characterized in that: A glue injection tube (5) is fixedly installed on the grid (22). The glue injection tube (5) is made of hollow steel pipe. The glue injection tube (5) penetrates the protective plate (4). The glue injection tube (5) has evenly distributed glue injection holes.

7. A municipal road widening and crack prevention structure according to claim 6, characterized in that: A drainage pipe (6) is installed in the sand and gravel layer. The drainage pipe (6) penetrates the protective plate (4) and is filled with filler.

8. A construction method for a crack-prevention structure for widening municipal roads, characterized in that: This method is applicable to the municipal road widening and crack prevention structure described in claim 7 above, and the construction method includes the following steps: S1. Preparation stage: Staff members measure and plan the old roadbed (1) according to the construction drawings, accurately mark the construction location, and transport the construction equipment and materials to the construction site. S2, Assembly stage: The staff excavated and modified the old roadbed (1) according to the construction process, and installed the overlapping components one by one in the overlapping trench (24) after the overlapping trench (24) was opened. S3. Widening stage: Workers widen the road according to the construction process, building the soil base, gravel layer, concrete layer and asphalt layer layer by layer, and combining the reinforcement components with it during the construction process. S4. Maintenance phase: During the long-term use of the widened road, the widened road should be monitored in a timely manner, and any cracks that appear in the road should be repaired promptly.

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