Mortise and tenon structure prefabricated base block assembly type roadbed structure based on bulk solid waste

Abstract

The invention belongs to the technical field of assembly type roads, and discloses a mortise and tenon structure prefabricated base block assembly type roadbed structure based on bulk solid waste, which comprises a soil matrix, composite geotechnical cloth is arranged above the soil matrix, and two geogrids are arranged above the composite geotechnical cloth. According to the invention, the geogrids are combined for integral assembly and are matched with joint filling and grouting to form an integral roadbed structure, so that the roadbed stability is better, the integral strength is higher, a bulk solid waste high-value efficient resource utilization mode with regional characteristics is provided, bulk solid wastes are effectively recycled, the roadbed construction effect is further improved, and the construction cost is reduced. The stability and service performance of the roadbed structure are remarkably improved, meanwhile, the problems that the load transfer capacity between traditional road prefabricated parts is poor, plates are relatively independent, and coordinative deformation cannot be achieved are effectively solved, solid waste filling roadbed green construction capable of being popularized is formed, and convenience is provided for recycling of bulk solid waste materials, environmental protection and the roadbed structure of the road.

Description

Technical Field

[0001] The present invention belongs to the technical field of assembled roads, and in particular is an assembled roadbed structure with prefabricated base blocks of mortise and tenon structures based on bulk solid waste. Background Art

[0002] Bulk solid waste refers to large amounts of low-value solid waste generated during production, consumption, construction, demolition and other activities. Compared with other solid wastes, bulk solid waste usually has a larger volume, lower hazard, and a simpler composition. It mainly comes from industries, construction projects, urban garbage and other fields.

[0003] In the existing technology, in order to solve the prominent contradictions and common problems such as large local solid waste production and inventory, large land occupation, low high-value resource utilization, high environmental protection requirements, and difficulty in taking abandoned soil for road construction, it is considered to use bulk solid waste to fill the roadbed. However, directly using solid waste to fill the roadbed may cause pollution to the construction site, and the existing prefabrication in the civil engineering field is mainly based on concrete and other materials, and the utilization of solid waste is relatively small. Moreover, the existing prefabricated structures are mainly used in road pavements and base layers. There are few studies on the assembly of mortise and tenon structure prefabricated blocks using bulk solid waste as raw materials to form roadbed structures. It is impossible to use prefabricated blocks to fill the roadbed after considering the comprehensive problems of bulk solidification. The actual application of bulk solidification in the roadbed field has a general effect and a low environmental protection utilization rate. Summary of the invention

[0004] The object of the present invention is to provide a prefabricated block assembled roadbed structure with mortise and tenon structures based on bulk solid waste, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mortise and tenon structure prefabricated base block assembled roadbed structure based on bulk solid waste, comprising a soil base, a composite geotextile is provided above the soil base, a geogrid is provided above the composite geotextile, the number of the geogrids is two, and they are symmetrically distributed up and down, a prefabricated base block is nested between the two geogrids, and both sides of the geogrid are provided with edge soil slope protection;

[0006] The prefabricated base block comprises an A-shaped surface and a B-shaped surface, the A-shaped surface and the B-shaped surface are of the same shape and are upside down, and the A-shaped surface and the B-shaped surface are each in two groups and are alternately distributed around the outer surface of the prefabricated base block;

[0007] The geogrid includes ribs, raised blocks and grouting ports. The ribs include transverse ribs and longitudinal ribs, which are vertically connected. The raised blocks are fixed on the top of the rib connection. The grouting ports are opened on the top of the raised blocks and penetrate the ribs.

[0008] Preferably, the A-type surface and the B-type surface both include section one, section two and section three, section one in the A-type surface and section one in the B-type surface are inverted, and section one and section three are located on the upper and lower sides of section two, and the A-type surface and the B-type surface are both stepped, and the A-type surface of one prefabricated block and the B-type surface of another prefabricated block are in contact and locked with each other.

[0009] Preferably, a plurality of groups of the prefabricated base blocks are assembled into a base block layer by means of mortise and tenon joints, and a fitting opening is provided inside the base block layer, and the fitting opening is enclosed by the prefabricated base blocks in the base block layer.

[0010] Preferably, the fitting openings correspond to the protruding blocks one by one, and the protruding blocks are sleeved in the fitting openings.

[0011] Preferably, the composite geotextile comprises a geotextile and a geomembrane, and the geomembrane is located between the upper and lower geotextiles.

[0012] Preferably, the geogrid is a special steel-plastic bonded-welded bidirectional tension grid, and the top of the geogrid is the road surface portion.

[0013] Preferably, the thickness of the edge soil slope protection is 1.5 m, and the slope protection soil of the edge soil slope protection is clay soil.

[0014] Preferably, the raw materials of the prefabricated base block are as follows by weight: 500-550 parts of fly ash, 300-350 parts of water, 50-100 parts of water glass, 10-60 parts of sodium hydroxide, and 140-190 parts of polypropylene fiber. The main components of the fly ash are 20% calcium oxide, 41% silicon dioxide, and 34% aluminum oxide.

[0015] Preferably, the weight proportions of the grouting slurry in the geogrid are: 100-150 parts of cement, 600-650 parts of sand, 100-150 parts of fly ash, 150-200 parts of water, and 50-100 parts of rubber particles.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) The present invention makes bulk solid waste into prefabricated blocks, and makes the assembled prefabricated roadbed parts in the roadbed interlock with each other through the prefabricated blocks, and then combines them with geogrids for overall assembly, and cooperates with grouting to form an overall roadbed structure, so that the roadbed has better stability and higher overall strength, and has a high-value and efficient resource utilization model of bulk solid waste with regional characteristics. While effectively recycling bulk solid waste, it further improves the roadbed construction effect, significantly improves the stability and serviceability of the roadbed structure, and effectively solves the problems of poor load transfer capacity between traditional road prefabricated components, relatively independent panels, and inability to coordinate deformation, forming a popularizable green construction of solid waste-filled roadbed, which provides convenience for the reuse of bulk solid waste materials, environmental protection and road subgrade structure.

[0018] (2) The present invention is assembled on site, has strong practical applicability, reduces the use of manpower, improves construction efficiency, saves production costs to a certain extent, and can achieve integrated design and construction and standardization, while facilitating the later renovation of damaged areas.

[0019] (3) The present invention uses prefabricated blocks that are mainly made of solid waste materials mixed with other materials. It can be manufactured using raw materials in different proportions, which meets the needs of actual production and provides a new method for the recycling and treatment of bulk solid waste, which is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 is a schematic diagram of a prefabricated base block of the present invention;

[0022] Figure 3 is a schematic diagram of the geogrid of the present invention;

[0023] Figure 4 It is a schematic diagram of the mortise and tenon interlocking of the prefabricated base block of the present invention;

[0024] Figure 5 It is a schematic diagram of the coordination of the geogrid and the prefabricated base block of the present invention.

[0025] In the figure: 100, prefabricated base block; 110, section one; 120, section two; 130, section three; 200, geogrid; 210, ribs; 220, raised block; 230, grouting opening; 300, soil base; 400, composite geotextile; 500, edge soil slope protection; 600, fitting opening. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 5As shown, the embodiment of the present invention provides a mortise and tenon structure prefabricated block assembled roadbed structure based on bulk solid waste, including a soil base 300, a composite geotextile 400 is arranged above the soil base 300, a geogrid 200 is arranged above the composite geotextile 400, the number of the geogrids 200 is two, and they are symmetrically distributed up and down, a prefabricated base block 100 is nested between the two geogrids 200, and both sides of the geogrid 200 are provided with edge soil slope protection, and the prefabricated base block 100 includes A A-shaped surface and B-shaped surface, A-shaped surface and B-shaped surface have the same shape and are upside down, A-shaped surface and B-shaped surface are two groups and are alternately distributed on the outer surface of the prefabricated base block 100, the geogrid 200 includes ribs 210, protruding blocks 220 and grouting ports 230, the ribs 210 include transverse ribs and longitudinal ribs, the transverse ribs and the longitudinal ribs are vertically connected, the protruding blocks 220 are fixed on the top of the connection between the ribs 210, and the grouting ports 230 are opened on the top of the protruding blocks 220 and pass through the ribs 210.

[0028] Among them, the A-type surface and the B-type surface both include section one 110, section two 120 and section three 130, section one 110 in the A-type surface and section one 110 in the B-type surface are upside down, section one 110 and section three 130 are located on the upper and lower sides of section two 120, and the A-type surface and the B-type surface are both stepped, the A-type surface of a prefabricated base block 100 and the B-type surface of another prefabricated base block 100 are in contact and interlocked with each other, and multiple groups of prefabricated base blocks 100 are assembled into a base block layer by mortise and tenon interlocking, and the base block layer is provided with a fitting opening 600, which is enclosed by the prefabricated base blocks 100 in the base block layer, and the fitting opening 600 corresponds one-to-one to the protruding block 220, and the protruding block 220 is sleeved in the fitting opening 600.

[0029] The composite geotextile 400 includes a geotextile and a geomembrane, and the geomembrane is located between the upper and lower geotextiles.

[0030] The geogrid 200 is a special steel-plastic bonded and welded bidirectional tension grid, and the top of the geogrid 200 is the road surface part.

[0031] The thickness of the edge soil slope protection 500 is 1.5 m, and the slope protection soil of the edge soil slope protection 500 is clay soil.

[0032] Among them, the weight proportions of raw materials of the prefabricated base block 100 are: 500-550 parts of fly ash, 300-350 parts of water, 50-100 parts of water glass, 10-60 parts of sodium hydroxide, and 140-190 parts of polypropylene fiber. The main components of fly ash are 20% calcium oxide, 41% silicon dioxide, and 34% aluminum oxide. The weight proportions of the grouting slurry in the geogrid 200 are: 100-150 parts of cement, 600-650 parts of sand, 100-150 parts of fly ash, 150-200 parts of water, and 50-100 parts of rubber particles.

[0033] Water glass is a soluble alkali metal silicate, which can stimulate the activity of silicon dioxide and aluminum oxide in fly ash. The alkalinity of water glass can dissolve the active substances in fly ash to form gel to achieve a solidification effect. In addition, water glass itself is sticky, which can bond fly ash particles and gel products together. After water loss and condensation, water glass will produce a certain strength, thereby improving the strength of fly ash materials. Polypropylene fiber can enhance the bending and folding properties of fly ash prefabricated components. The production of prefabricated base block 100 mainly adopts press dry pressing molding method, which has high environmental protection degree, high production efficiency, low water content, high degree of automation, and can realize mass production.

[0034] After being prefabricated in the factory, it is cured in a specific manner for a certain period of time and then transported to the road construction site.

[0035] The selected rubber particles come from waste tires. The shear and compression strength of rubber particles can enhance the rigidity of the grouting material. In a cement slurry mixer, a certain amount of cement, sand, fly ash, water and rubber particles are added and mixed to make a filling material. Using cement mortar with this ratio as a filling material can meet the fluidity requirements required for on-site filling, and can also meet the compressive and flexural strength requirements.

[0036] Embodiment 1: The prefabricated base blocks 100 in the roadbed can be filled to a height of 0.6 meters to 0.8 meters. The highway grade is a highway. The design flood frequency of the roadbed is 1 / 100. The frozen depth of the roadbed is 4.8 meters. It is determined to use a large-sized prefabricated base 100 and a large-sized special geogrid 200. A plurality of large-sized prefabricated base blocks 100 are interlocked with each other, and then assembled into one with the large-sized special geogrid 200. Grouting is performed through the grouting opening 230 on the grid to form an integral roadbed.

[0037] The weight proportions of raw materials of the prefabricated base block 100 are: 550 parts of fly ash, 350 parts of water, 100 parts of water glass, 60 parts of sodium hydroxide, and 190 parts of polypropylene fiber; the prefabricated base block 100 is dry-pressed in a factory press, and then steam-cured in a curing room for 2 days at a curing temperature of 75°C and a curing humidity of 98%; and then cured at a constant temperature for 27 days at a curing temperature of 25°C and a curing humidity of 98%.

[0038] The weight proportions of the grouting slurry are: 150 parts of cement, 650 parts of sand, 150 parts of fly ash, 200 parts of water, and 100 parts of rubber particles, which are stirred in a cement slurry mixer for no less than 200 seconds.

[0039] The fly ash, water, water glass, sodium hydroxide, and polypropylene fiber used in the raw materials of the prefabricated base block 100 in this example are all at the maximum value, and the prefabricated base block 100 has excellent strength performance and can meet the needs of roadbed filling. The cement, sand, fly ash, water, and rubber particles used in the raw materials of the grouting slurry in this example are all at the maximum value, the stirring time is 200s, and the mortar fluidity is 300 and the compressive strength is 27.1 MPa after inspection.

[0040] Example 2: The filling height of the prefabricated blocks in the roadbed can be between 0.3 meters and 0.6 meters. The highway grade is a first-class or second-class highway. The design flood frequency of the roadbed is 1 / 100 or 1 / 50. The frozen depth of the roadbed is 3.5 meters. It is determined to use medium-sized prefabricated blocks 100 and medium-sized special geogrids 200. Multiple medium-sized prefabricated blocks 100 are interlocked with each other and then assembled into one with the medium-sized special geogrids 200. Grouting is carried out through the grouting holes on the grid to form an integral roadbed.

[0041] The weight proportions of raw materials of the prefabricated base block 100 are as follows: 525 parts of fly ash, 325 parts of water, 75 parts of water glass, 35 parts of sodium hydroxide, and 165 parts of polypropylene fiber. The prefabricated base block 100 is dry pressed in a factory press, and then steam cured in a curing room for 2 days, a curing temperature of 75°C, and a curing humidity of 98%. The prefabricated base block 100 is cured for 27 days, a curing temperature of 25°C, and a curing humidity of 98%.

[0042] The weight proportions of the grouting slurry are: 125 parts of cement, 625 parts of sand, 125 parts of fly ash, 175 parts of water, and 75 parts of rubber particles. Stir in a cement slurry mixer for no less than 200 seconds.

[0043] Compared with Example 1, the amount of fly ash, water, water glass, sodium hydroxide and polypropylene fiber in the raw materials of the prefabricated base block 100 of this example is reduced by 25 parts. The strength after dry pressing can reach 2.2 MPa. Steam curing is first carried out in the curing room, with a curing period of 2 days, a curing temperature of 75°C, a curing humidity of 98%, and a compressive strength of 5.6 MPa; constant temperature curing, a curing period of 27 days, a curing temperature of 25°C, a curing humidity of 98%, and a compressive strength of 21.1 MPa. The strength growth trend curve is good. The prefabricated base block 100 has excellent strength performance and can meet the needs of roadbed filling. The amount of cement, sand, fly ash, water and rubber particles in the raw materials of the grouting slurry of this example is reduced by 25 parts, the stirring time is 200s, and the mortar fluidity is 295 and the compressive strength is 26.4 MPa. Compared with Example 1, the amount of various materials is reduced, but the strength can still meet the requirements of roadbed strength, so it is more valuable.

[0044] Embodiment 3: The prefabricated blocks 100 in the roadbed can be filled with a height of 0 meters to 0.3 meters, the highway grade is a third-class or fourth-class highway, the design flood frequency of the roadbed is 1 / 25, and the frozen depth of the roadbed is 2.7 meters; it is determined to select small-sized prefabricated blocks 100 and small-sized special geogrids 200, multiple small-sized prefabricated blocks 100 are interlocked with each other, and then assembled into one with small-sized special geogrids 200, and grouting is performed through the grouting holes on the grid to form an integral roadbed;

[0045] The weight proportions of the raw materials of the prefabricated base block are as follows: 500 parts of fly ash, 300 parts of water, 50 parts of water glass, 10 parts of sodium hydroxide, and 140 parts of polypropylene fiber. The prefabricated base block is dry-pressed in a factory press, and then steam-cured in a curing room for 2 days at a curing temperature of 75°C and a curing humidity of 98%; and constant temperature-cured for 27 days at a curing temperature of 25°C and a curing humidity of 98%.

[0046] The weight proportions of the grouting slurry are: 100 parts of cement, 600 parts of sand, 100 parts of fly ash, 150 parts of water, and 50 parts of rubber particles, which are stirred in a cement slurry mixer for no less than 200 seconds.

[0047] Compared with Example 1, the amount of fly ash, water, water glass, sodium hydroxide and polypropylene fiber in the raw materials of the prefabricated base block in this example is the minimum. The strength can reach 1.7 MPa after dry pressing. Steam curing is first carried out in the curing room with a curing period of 2 days, a curing temperature of 75°C, and a curing humidity of 98%. The compressive strength can reach 3.9 MPa. Constant temperature curing, a curing period of 27 days, a curing temperature of 25°C, and a curing humidity of 98%, can reach a compressive strength of 19.8 MPa. The strength of the prefabricated base block 100 is normal and can meet the needs of roadbed filling. The amount of cement, sand, fly ash, water and rubber particles in the raw materials of the grouting slurry in this example is the minimum, the stirring time is 200s, and the mortar fluidity is 290 after inspection, and the compressive strength is 25.6 MPa. Compared with Example 1, the amount of various materials is the minimum, but the strength can still meet the requirements of roadbed strength, but the strength performance of each item is poor compared with Example 2.

[0048] The working principle and use process of the present invention are as follows: During construction, a plurality of prefabricated base blocks 100 are first interlocked with each other through mortise and tenon structures to form a whole, a composite geotextile 400 is laid on the top of the soil foundation 300, a group of geogrids 200 are laid on the top of the composite geotextile 400, and the interlocked base block layer is placed on the top of the geogrid 200 at the bottom, keeping the raised block 220 in the bottom geogrid 200 nested in the bottom of the fitting opening 600 of the base block layer, and then another group of geogrids 200 is laid on the top of the base block layer, keeping The raised blocks 220 of the geogrid 200 face downwards, and similarly, the raised blocks 220 of the upper geogrid 200 are nested in the top fitting openings 600 of the base block layer. The raised blocks 220 in the upper and lower geogrids 200 are aligned, and their corresponding grouting openings 230 are aligned and connected. Grouting is performed through the top grouting opening 230, and the slurry is filled to form an integral roadbed portion of the prefabricated base blocks 100 and geogrids 200 assembled with mortise and tenon joints. Subsequently, 1.5m thick edge soil slope protection 500 is arranged on both sides of the roadbed formed above to complete the roadbed paving.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated mortise and tenon structure roadbed structure based on bulk solid waste, comprising a soil foundation (300), characterized in that: A composite geotextile (400) is provided above the soil foundation (300), a geogrid (200) is provided above the composite geotextile (400), two geogrids (200) are provided and are symmetrically distributed up and down, a prefabricated base block (100) is nested between the two geogrids (200), and both sides of the geogrid (200) are provided with edge soil slope protection; The prefabricated base block (100) comprises an A-shaped surface and a B-shaped surface, the A-shaped surface and the B-shaped surface are of the same shape and are upside down, and the A-shaped surface and the B-shaped surface are each in two groups and are alternately distributed around the outer surface of the prefabricated base block (100); The geogrid (200) comprises ribs (210), raised blocks (220) and grouting ports (230), wherein the ribs (210) comprise transverse ribs and longitudinal ribs, wherein the transverse ribs and longitudinal ribs are vertically connected, the raised blocks (220) are fixed to the top of the connection between the ribs (210), and the grouting ports (230) are opened at the top of the raised blocks (220) and penetrate the ribs (210).

2. The prefabricated mortise and tenon structure block-assembled roadbed structure based on bulk solid waste according to claim 1, characterized in that: The A-shaped surface and the B-shaped surface both include a section one (110), a section two (120) and a section three (130), the section one (110) in the A-shaped surface and the section one (110) in the B-shaped surface are upside down, the section one (110) and the section three (130) are located on the upper and lower sides of the section two (120), the A-shaped surface and the B-shaped surface are both stepped, and the A-shaped surface of one prefabricated base block (100) and the B-shaped surface of another prefabricated base block (100) are in contact and locked with each other.

3. The prefabricated block-assembled roadbed structure with mortise and tenon structure based on bulk solid waste according to claim 2 is characterized by: A plurality of groups of the prefabricated base blocks (100) are assembled into a base block layer by means of mortise and tenon joints. A fitting opening (600) is provided inside the base block layer. The fitting opening (600) is enclosed by the prefabricated base blocks (100) in the base block layer.

4. The prefabricated mortise and tenon structure block assembled roadbed structure based on bulk solid waste according to claim 3, characterized in that: The fitting opening (600) corresponds to the protruding block (220) in a one-to-one manner, and the protruding block (220) is sleeved in the fitting opening (600).

5. The prefabricated mortise and tenon structure block assembled roadbed structure based on bulk solid waste according to claim 1, characterized in that: The composite geotextile (400) comprises a geotextile and a geomembrane, wherein the geomembrane is located between the upper and lower geotextiles.

6. The prefabricated mortise and tenon structure block assembled roadbed structure based on bulk solid waste according to claim 1, characterized in that: The geogrid (200) is a special steel-plastic bonded and welded bidirectional tension grid, and the top of the geogrid (200) is a road surface portion.

7. The prefabricated mortise and tenon structure block assembled roadbed structure based on bulk solid waste according to claim 1, characterized in that: The thickness of the edge soil slope protection (500) is 1.5 m, and the slope protection soil of the edge soil slope protection (500) is clay soil.

8. The prefabricated mortise and tenon structure block assembled roadbed structure based on bulk solid waste according to claim 1, characterized in that: The raw materials of the prefabricated base block (100) are as follows: 500-550 parts by weight of fly ash, 300-350 parts by weight of water, 50-100 parts by weight of water glass, 10-60 parts by weight of sodium hydroxide, and 140-190 parts by weight of polypropylene fiber. The fly ash mainly comprises 20% calcium oxide, 41% silicon dioxide, and 34% aluminum oxide.

9. The prefabricated mortise and tenon structure block assembled roadbed structure based on bulk solid waste according to claim 6, characterized in that: The weight proportions of the grouting slurry for filling the geogrid (200) are: 100-150 parts of cement, 600-650 parts of sand, 100-150 parts of fly ash, 150-200 parts of water, and 50-100 parts of rubber particles.

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