A combined honeycomb subgrade structure based on recycled concrete

Abstract

The present invention discloses a combined honeycomb subgrade structure based on recycled concrete, belonging to the technical field of subgrade structure design. It includes a pipe fitting retaining structure formed by splicing multiple layers of tiled pipe fitting groups. A backfill area is formed between the pipe fitting retaining structures. Each layer of tiled pipe fitting group includes multiple honeycomb precast pipe fittings arranged side by side, and adjacent honeycomb precast pipe fittings are arranged in a fitting manner. The pipe fitting retaining structure is longitudinally divided into multiple backfill layers, and each backfill layer includes several layers of tiled pipe fitting groups. Two sets of limiting rod assemblies are arranged on the backfill layer. The limiting rod assembly includes at least two limiting rods arranged along the axial direction of the honeycomb precast pipe fitting. The two sets of limiting rod assemblies are arranged in an X shape, and the limiting rods in each set of limiting rod assemblies penetrate the backfill layer along the vertical direction of the inclined plane of the honeycomb precast pipe fitting. The limiting rod assemblies in adjacent backfill layers form a rhombic closed area in the cross section. By arranging the limiting rods to penetrate the backfill layers in sequence, the stability of the spliced honeycomb precast pipe fittings is improved in the present invention.

Description

Technical Field

[0001] The invention belongs to the technical field of roadbed structure design, and in particular relates to a combined honeycomb roadbed structure based on recycled concrete. Background Art

[0002] A large amount of construction waste will be generated during the construction of highways. If the construction waste is not placed in an area with good geology, a large amount of engineering treatment costs will be incurred and large-scale landslides will occur. Therefore, properly handling the construction waste generated during the construction process has become the main means to reduce the cost of project engineering. The preparation of construction waste into recycled concrete has been widely used in the field of domestic infrastructure construction. In road construction, recycled concrete can be used as base and subbase materials, effectively reducing dependence on natural resources and improving the durability and bearing capacity of roads.

[0003] In order to better carry out the construction of expressways, the anti-overturning performance of traditional retaining walls is optimized, the amount of backfill soil required is reduced by optimizing the retaining wall structure, and the recycling efficiency of construction waste during the construction process is improved; in the prior art, a Chinese patent with announcement number CN118273179A proposes a honeycomb roadbed retaining structure and a construction method thereof, in which honeycomb prefabricated pipe parts made of construction waste are laid and assembled in multiple layers to form a right-angled trapezoid as a whole, and the soil excavated by backfilling the embankment is supported on the inclined side of the right-angled trapezoid, so that the roadbed retaining structure has excellent anti-overturning ability and stability, reduces the mining of backfill soil in existing projects, and improves the utilization efficiency of construction residues. However, in the above technology, when backfilling the soil, only the friction force of the contact surface of the honeycomb prefabricated pipe is used to resist the overturning of the retaining wall caused by the active earth pressure generated by the backfill soil. The active earth pressure generated by the backfill soil is relatively large. Only the friction force of the contact surface of the prefabricated pipe is used to resist it, which may easily cause the prefabricated pipes located at the edge to topple, thereby reducing the stability of the prefabricated pipes after splicing. In addition, during the operation of the roadbed, the prefabricated pipes may be easily dislocated or collapsed due to vehicle load and soil settlement.

[0004] Therefore, it is necessary to propose a combined honeycomb roadbed structure based on recycled concrete to solve the above problems. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a combined honeycomb roadbed structure based on recycled concrete, so as to solve the problem of insufficient stability of honeycomb prefabricated pipes after splicing in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a combined honeycomb subgrade structure based on recycled concrete, including a pipe fitting retaining structure formed by splicing multiple layers of horizontally laid pipe fitting groups. A backfill area for backfilling soil is formed between the pipe fitting retaining structures. The backfill area is an isosceles trapezoid with a wider top and a narrower bottom. Each layer of horizontally laid pipe fitting group includes multiple honeycomb precast pipe fittings arranged side by side in the horizontal direction. The cross-section of the honeycomb precast pipe fitting is a regular hexagon. In adjacent layers of horizontally laid pipe fitting groups, adjacent honeycomb precast pipe fittings are arranged in a fitting manner. The pipe fitting retaining structure is longitudinally divided into multiple backfill layers. Each backfill layer includes several layers of horizontally laid pipe fitting groups. Two sets of limiting rod assemblies are arranged on the backfill layer. The limiting rod assembly includes at least two limiting rods arranged along the axial direction of the honeycomb precast pipe fitting. The two sets of limiting rod assemblies are arranged in an X shape. And the limiting rods in each set of limiting rod assemblies penetrate the backfill layer along the vertical direction of the inclined plane of the honeycomb precast pipe fitting. The limiting rod assemblies in adjacent backfill layers form a diamond-shaped closed area in the cross-section.

[0008] Further, through holes cooperating with the limiting rods are provided on the honeycomb precast pipe fittings through which the limiting rods pass.

[0009] Further, a threaded section is provided on the side of the limiting rod extending out of the bottom end of the backfill layer. A limiting block is fixedly arranged on the side of the limiting rod away from the threaded section. The diameter of the limiting block is larger than that of the limiting rod. The outer diameter of the threaded section is smaller than that of the limiting rod. A nut is threadedly connected to the threaded section. The threaded connection between the nut and the threaded section can fix multiple honeycomb precast pipe fittings through which the limiting rods pass between the nut and the limiting block.

[0010] Further, a positioning groove is provided on one side of the honeycomb precast pipe fitting. A positioning plate cooperating with the positioning groove is provided on the side of the honeycomb precast pipe fitting opposite to the positioning groove. The through hole penetrates through the positioning groove and the positioning plate.

[0011] Further, the construction method of the combined honeycomb subgrade structure based on recycled concrete includes the following steps:

[0012] S1, splicing the first backfill layer: Horizontally install multiple honeycomb precast pipe fittings side by side to form the first layer of horizontally laid pipe fitting group. Then install the honeycomb precast pipe fittings of the second layer between adjacent honeycomb precast pipe fittings in the first layer of horizontally laid pipe fitting group to form the second layer of horizontally laid pipe fitting group. Install multiple layers of horizontally laid pipe fitting groups in the above-mentioned manner in sequence to form the first backfill layer. Among them, then penetrate the two sets of limiting rod assemblies obliquely through the honeycomb precast pipe fittings from both ends at the top of the first backfill layer until they extend out a preset distance from both ends at the bottom of the first backfill layer. Then use the threaded connection between the nut and the threaded section to fix multiple honeycomb precast pipe fittings through which the limiting rods pass between the nut and the limiting block;

[0013] S2. Backfill the soil in the first backfill layer so that the backfill soil covers the part of the limiting rod extending from the bottom end of the first backfill layer, and there is a height of the limiting rod extending from the bottom end of the second backfill layer reserved between the backfill soil and the top end of the first backfill layer. After backfilling, compact it 3 - 4 times.

[0014] S3. Sequentially splice the backfill layers and backfill the soil according to steps S1 - S2 until a combined honeycomb roadbed structure based on recycled concrete is formed.

[0015] Furthermore, baffles that can block the openings of the honeycomb prefabricated pipe fittings are thread - connected to both sides of the honeycomb prefabricated pipe fittings. In step S1, after arranging each layer of the flat - laid pipe fitting group, thread - connect the baffles to the openings on both sides of the honeycomb prefabricated pipe fittings to block the honeycomb prefabricated pipe fittings.

[0016] Furthermore, the baffle includes a first baffle thread - connected to the honeycomb prefabricated pipe fitting away from the backfill area and a second baffle thread - connected to the honeycomb prefabricated pipe fitting close to the backfill area. A grouting port is arranged in the first baffle, and a plug block that can close the grouting port is thread - connected in the grouting port. A piston is connected to the second baffle in a limited - sliding manner. A spring is fixedly connected between the piston and the second baffle. A sliding rod is fixedly connected to the piston, and a limiting hole for the limited - sliding connection of the sliding rod is arranged on the second baffle.

[0017] The beneficial effects of the present invention are as follows:

[0018] After the limiting rod penetrates through the backfill layers in sequence in the present invention, it can initially fix the spliced honeycomb prefabricated pipe fittings in the backfill layer. After backfilling, the backfill soil covers the part of the limiting rod extending from the backfill layer, improving the connection stability between the pipe fitting soil - retaining structure and the backfill soil. Moreover, the rhombic closed area formed by the limiting rod components in the adjacent backfill layers in the cross - section can strengthen the limiting effect on the honeycomb prefabricated pipe fittings within the closed area, improving the stability of the spliced honeycomb prefabricated pipe fittings. During the operation of the roadbed, it reduces the influence of soil settlement on the pipe fitting soil - retaining structure. And through the setting of the limiting rod, it reduces the tipping of the honeycomb prefabricated pipe fittings caused by the active earth pressure during the soil backfilling process. And due to the fixing effect of the limiting rod on the honeycomb prefabricated pipe fittings, it can reduce the requirement for the surface roughness of the honeycomb prefabricated pipe fittings, making the installation alignment process more labor - saving. And during the process of the limiting rod penetrating through the honeycomb prefabricated pipe fittings, it can detect whether the honeycomb prefabricated pipe fittings are assembled in place.

[0019] Other advantages, objectives, and features of the present invention will be described in the subsequent specification, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0021] Figure 1 Schematic diagram of the splicing structure of the backfill layer in an embodiment of the present invention;

[0022] Figure 2 Side view of the splicing of the backfill layer in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the backfilling of the backfill soil in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the limiting rod in an embodiment of the present invention;

[0025] Figure 5 Assembly schematic diagram of the limiting rod passing through adjacent honeycomb prefabricated pipe fittings in an embodiment of the present invention;

[0026] Figure 6 Cross-sectional view of the structure of the honeycomb prefabricated pipe fitting in an embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the operating state of the combined honeycomb roadbed structure based on recycled concrete in an embodiment of the present invention.

[0028] The reference signs in the drawings are as follows: honeycomb prefabricated pipe fitting 1, through hole 101, positioning groove 102, positioning plate 103, first baffle 104, second baffle 105, plugging block 106, piston 107, spring 108, sliding rod 109, limiting hole 110, pipe fitting soil retaining structure 2, backfill layer 201, closed area 202, backfill soil 203, backfill area 3, limiting rod 4, threaded section 401, limiting block 402, nut 403. Detailed implementation manners

[0029] As Figures 1 to 7As shown in the figure, the present invention provides a combined honeycomb subgrade structure based on recycled concrete, including: a pipe fitting retaining structure 2 formed by splicing multiple layers of horizontally laid pipe fitting groups. A backfill area 3 for backfilling soil is formed between the pipe fitting retaining structures 2. The backfill area 3 is an isosceles trapezoid with a wider top and a narrower bottom. Each layer of horizontally laid pipe fitting group includes multiple honeycomb precast pipe fittings 1 arranged side by side in the horizontal direction. The cross-section of the honeycomb precast pipe fitting 1 is a regular hexagon, and in adjacent layers of horizontally laid pipe fitting groups, adjacent honeycomb precast pipe fittings 1 are arranged in contact. The pipe fitting retaining structure 2 is longitudinally divided into multiple backfill layers 201. Each backfill layer 201 includes several layers of horizontally laid pipe fitting groups. Two sets of limiting rod 4 assemblies are arranged on the backfill layer 201. The limiting rod 4 assembly includes at least two limiting rods 4 arranged along the axial direction of the honeycomb precast pipe fitting 1. The two sets of limiting rod 4 assemblies are arranged in an X shape, and the limiting rods 4 in each set of limiting rod 4 assemblies penetrate the backfill layer 201 along the vertical direction of the inclined plane of the honeycomb precast pipe fitting 1. The limiting rod 4 assemblies in adjacent backfill layers 201 form a rhombus-shaped closed area 202 in the cross-section.

[0030] Among them, through holes 101 cooperating with the limiting rods 4 are arranged on the honeycomb precast pipe fittings 1 for the limiting rods 4 to pass through.

[0031] Among them, a threaded section 401 is arranged on the side of the limiting rod 4 extending out of the bottom end of the backfill layer 201. A limiting block 402 is fixedly arranged on the side of the limiting rod 4 away from the threaded section 401. The diameter of the limiting block 402 is larger than the diameter of the limiting rod 4. The outer diameter of the threaded section 401 is smaller than the diameter of the limiting rod 4. A nut 403 is threadedly connected to the threaded section 401. The threaded connection between the nut 403 and the threaded section 401 can fix multiple honeycomb precast pipe fittings 1 for the limiting rods 4 to pass through between the nut 403 and the limiting block 402.

[0032] In this solution, the construction method of the combined honeycomb subgrade structure based on recycled concrete includes the following steps:

[0033] S1, splicing the first backfill layer 201: Horizontally install multiple honeycomb precast pipe fittings 1 side by side to form the first layer of horizontally laid pipe fitting group, and then install the honeycomb precast pipe fittings 1 of the second layer between adjacent honeycomb precast pipe fittings 1 in the first layer of horizontally laid pipe fitting group to form the second layer of horizontally laid pipe fitting group. Install multiple layers of horizontally laid pipe fitting groups in the above manner to form the first backfill layer 201. Among them, then penetrate the two sets of limiting rod 4 assemblies obliquely from both ends at the top of the first backfill layer 201 through the honeycomb precast pipe fittings 1 until they extend a preset distance from both ends at the bottom of the first backfill layer 201, and then use the threaded connection between the nut 403 and the threaded section 401 to fix multiple honeycomb precast pipe fittings 1 for the limiting rods 4 to pass through between the nut 403 and the limiting block 402;

[0034] S2. Backfill the soil of the first backfill layer 201 so that the backfill soil 203 covers the part of the limiting rod 4 extending out of the bottom end of the first backfill layer 201, and a height of the limiting rod 4 extending out of the bottom end of the second backfill layer 201 is reserved between the backfill soil 203 and the top end of the first backfill layer 201. After backfilling, compact it 3 to 4 times.

[0035] S3. Sequentially splice the backfill layers 201 and backfill the soil according to steps S1 - S2 until a combined honeycomb roadbed structure based on recycled concrete is formed.

[0036] In this solution, after the limiting rod 4 sequentially penetrates through the backfill layers 201, it can initially fix the honeycomb prefabricated pipe fittings 1 in the backfill layer 201 after splicing. After backfilling, the backfill soil covers the part of the limiting rod 4 extending out of the backfill layer 201, improving the connection stability between the pipe fitting retaining structure 2 and the backfill soil. Moreover, the diamond - shaped closed area 202 formed by the limiting rod components in adjacent backfill layers in the cross - section can strengthen the limiting effect on the honeycomb prefabricated pipe fittings 1 within the closed area 202, improving the stability of the spliced honeycomb prefabricated pipe fittings 1. During the operation of the roadbed, it reduces the influence of soil settlement on the pipe fitting retaining structure 2. And through the setting of the limiting rod 4, it reduces the tipping of the honeycomb prefabricated pipe fittings 1 caused by the active earth pressure during soil backfilling, and the fixing effect of the limiting rod 4 on the honeycomb prefabricated pipe fittings 1 can reduce the requirement for the surface roughness of the honeycomb prefabricated pipe fittings 1, making the installation alignment process more labor - saving. And during the process of the limiting rod 4 penetrating through the honeycomb prefabricated pipe fittings 1, it can detect whether the honeycomb prefabricated pipe fittings 1 are assembled in place.

[0037] In an embodiment of the present invention, a positioning groove 102 is provided on one side of the honeycomb prefabricated pipe fitting 1, a positioning plate 103 cooperating with the positioning groove 102 is provided on the side of the honeycomb prefabricated pipe fitting 1 opposite to the positioning groove 102, and the through - hole 101 penetrates through the positioning groove 102 and the positioning plate 103.

[0038] This solution, through the cooperation of the positioning groove 102 and the positioning plate 103, when splicing the honeycomb prefabricated pipe fittings 1 with through - holes 101, can ensure that after splicing, the through - holes 101 on adjacent honeycomb prefabricated pipe fittings 1 are on the same axis, facilitating the splicing of the honeycomb prefabricated pipe fittings 1 and ensuring the alignment of the through - holes 101.

[0039] In an embodiment of the present invention, baffles capable of blocking the openings of the honeycomb prefabricated pipe fittings 1 are thread - connected to both sides of the honeycomb prefabricated pipe fitting 1. After arranging each layer of the flat - laid pipe fitting group, thread - connect the baffles to the openings on both sides of the honeycomb prefabricated pipe fitting 1 to block the honeycomb prefabricated pipe fitting 1, preventing the backfill soil 203 from pouring into the honeycomb prefabricated pipe fitting 1 during the dumping process.

[0040] In an embodiment of the present invention, the baffle includes a first baffle 104 threadedly connected to the honeycomb prefabricated pipe fitting 1 away from the backfill area 3 and a second baffle 105 threadedly connected to the honeycomb prefabricated pipe fitting 1 close to the backfill area 3. A grouting port is provided in the first baffle 104, and a plug block 106 capable of closing the grouting port is threadedly connected in the grouting port. A piston 107 is connected to the second baffle 105 in a limited sliding manner. A spring 108 is fixedly connected between the piston 107 and the second baffle 105. A sliding rod 109 is fixedly connected to the piston 107, and a limiting hole 110 for limited sliding connection with the sliding rod 109 is provided on the second baffle 105.

[0041] In this solution, for areas with high requirements for subgrade support strength, to avoid damage to the hollow honeycomb prefabricated pipe fitting 1 caused by high-strength loads on the road surface during the operation of the subgrade, after the honeycomb prefabricated pipe fitting 1 is blocked by the baffle, the plug block 106 located at the grouting port can be screwed out. The grouting mechanism is connected to the grouting pipe, and the grouting pipe is inserted along the grouting port. The grouting mechanism is used for grouting operations to make the hollow honeycomb prefabricated pipe fitting 1 solid, so as to improve the support capacity of the honeycomb prefabricated pipe fitting 1 and the stability of the subgrade structure. And during the grouting process, the slurry squeezes the piston 107, thereby compressing the spring 108 to drive the sliding rod 109 to slide along the limiting hole 110 to ensure that the slurry can fill the honeycomb prefabricated pipe fitting 1.

[0042] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A combined honeycomb roadbed structure based on recycled concrete, comprising a pipe retaining structure formed by splicing a multi-layer flat pipe assembly, characterized in that: A backfill area for backfilling soil is formed between the pipe retaining structures, and the backfill area is in the shape of an isosceles trapezoid which is wide at the top and narrow at the bottom. Each layer of the flat pipe group includes a plurality of honeycomb prefabricated pipes arranged side by side in the horizontal direction, and the cross-section of the honeycomb prefabricated pipes is a regular hexagon. In the adjacent layers of the flat pipe groups, adjacent honeycomb prefabricated pipes are arranged in a close fit. The pipe retaining structure is divided into a plurality of backfill layers in the longitudinal direction, and each backfill layer includes a plurality of layers of the flat pipe groups. Two groups of limiting rod assemblies are arranged on the backfill layers, and the limiting rod assemblies include at least two limiting rods arranged axially along the honeycomb prefabricated pipes. The two groups of limiting rod assemblies are arranged in an X shape, and the limiting rods in each group of limiting rod assemblies penetrate the backfill layer in the vertical direction of the inclined surface of the honeycomb prefabricated pipe. The limiting rod assemblies in adjacent backfill layers form a diamond-shaped closed area in the cross section.

2. The combined honeycomb roadbed structure based on recycled concrete according to claim 1 is characterized in that: A through hole matching with the limiting rod is arranged on the honeycomb prefabricated pipe member for the limiting rod to pass through.

3. The combined honeycomb roadbed structure based on recycled concrete according to claim 2 is characterized in that: A threaded section is provided on the bottom end side of the limiting rod extending out of the backfill layer, a limiting block is fixedly provided on the side of the limiting rod away from the threaded section, the diameter of the limiting block is larger than the diameter of the limiting rod, the outer diameter of the threaded section is smaller than the diameter of the limiting rod, a nut is threadedly connected on the threaded section, and the threaded connection between the nut and the threaded section can fix multiple honeycomb prefabricated pipe fittings through which the limiting rod passes between the nut and the limit block.

4. The combined honeycomb roadbed structure based on recycled concrete according to claim 3 is characterized in that: A positioning groove is arranged on one side of the honeycomb prefabricated pipe, and a positioning plate cooperating with the positioning groove is arranged on a side opposite to the positioning groove of the honeycomb prefabricated pipe, and the through hole passes through the positioning groove and the positioning plate.

5. The combined honeycomb roadbed structure based on recycled concrete according to claim 4 is characterized in that: The construction method of the combined honeycomb roadbed structure based on recycled concrete comprises the following steps: S1, splicing the first backfill layer: multiple honeycomb prefabricated pipe fittings are installed side by side in the horizontal direction to form a first layer of flat pipe fittings group, and then the second layer of honeycomb prefabricated pipe fittings are installed between adjacent honeycomb prefabricated pipe fittings in the first layer of flat pipe fittings group to form a second layer of flat pipe fittings group, and multiple layers of flat pipe fitting groups are installed in sequence in the above manner to form the first backfill layer, wherein two groups of limiting rod assemblies are then obliquely penetrated through the honeycomb prefabricated pipe fittings from both ends of the top of the first backfill layer until they extend a preset distance from both ends of the bottom of the first backfill layer, and then the multiple honeycomb prefabricated pipe fittings through which the limiting rods pass are fixed between the nut and the limit block by threading the nut and the threaded section; S2, backfill the first backfill layer with soil, so that the backfill soil covers the limit rod extending from the bottom end of the first backfill layer, and a limit rod height extending from the bottom end of the second backfill layer is reserved between the backfill soil and the top of the first backfill layer, and compact 3 to 4 times after backfilling; S3, splicing the backfill layers in sequence according to steps S1 to S2 and backfilling the soil until a combined honeycomb roadbed structure based on recycled concrete is formed.

6. The combined honeycomb roadbed structure based on recycled concrete according to claim 5, characterized in that: The honeycomb prefabricated pipe is threadedly connected to the two sides with baffles capable of blocking the openings of the honeycomb prefabricated pipe. In step S1, after each layer of flat pipe groups is arranged, the baffles are threadedly connected to the openings on both sides of the honeycomb prefabricated pipe to block the honeycomb prefabricated pipe.

7. The combined honeycomb roadbed structure based on recycled concrete according to claim 6, characterized in that: The baffle comprises a first baffle threadedly connected to the honeycomb prefabricated pipe away from the backfill area and a second baffle threadedly connected to the honeycomb prefabricated pipe close to the backfill area, the first baffle is provided with a grouting port, a sealing block capable of closing the grouting port is threadedly connected to the grouting port, a piston is slidably connected to the upper limit position of the second baffle, a spring is fixedly connected between the piston and the second baffle, a sliding rod is fixedly connected to the piston, and a limiting hole slidably connected to the sliding rod is provided on the second baffle.

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