Cement stabilized base edge pressing construction method

Abstract

The invention relates to the technical field of cement stabilized base construction, in particular to a cement stabilized base edge pressing construction method. The invention discloses a cement stabilized base edge pressing construction method. The method comprises the following steps: step 1, preparing materials; step 2, paving a base layer; step 3, compacting the base layer; fourthly, formwork erecting is conducted on the edge of the base layer; step 5, spraying cement paste; and step 6, maintenance. According to the cement stabilized base edge pressing construction method, the steps are adopted, the cement stabilized base is subjected to construction operation and auxiliary formwork erecting, the cement stabilized base can be compacted, the cement stabilized layer is stable in structure, the strength reaches the standard, the strength is increased along with the age, a plate body is rapidly formed, and therefore the cement stabilized base edge pressing construction method has the high strength, and the service life of the cement stabilized base edge pressing construction method is prolonged. The anti-permeability and the freezing resistance are good, and meanwhile, the problem of insufficient compaction of the edge part is solved.

Description

Technical Field

[0001] The invention relates to the technical field of cement stabilized base construction, in particular to a cement stabilized base edge pressing construction method. Background Art

[0002] Water-stabilizing layer is the abbreviation of cement-stabilized base, which is completed by cement-consolidated graded gravel through compaction and maintenance.

[0003] The water-stabilizing layer has high strength, rigidity and stability. For asphalt pavement, the water-stabilizing layer is the main load-bearing layer of the entire road structure. It is an important structure to ensure the stability of the entire road structure and can effectively transfer the vertical load of the road to the roadbed.

[0004] The mix ratio of water-stabilized concrete should be tested in the laboratory in advance to determine the cement content and the ratio of coarse and fine aggregates, as well as the maximum dry density. If the amount is large, a water-stabilized concrete mixing station can be used for mixing.

[0005] The main problems in cement-stabilized base construction include insufficient compaction, insufficient cement content, non-standard construction technology, loose rolling, separation of coarse and fine materials during paving, unqualified unconfined compressive strength, and loose base.

[0006] In view of the above-mentioned defects, the designers have actively carried out research and innovation in order to create a construction method for compacting the edge of a cement-stabilized base layer to make it more valuable for industrial use. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a method for compacting the edge of a cement-stabilized base.

[0008] A method for edge compaction of a cement stabilized base layer of the present invention comprises the following steps: Step 1: Material preparation; Step 2: paving the base layer; Step 3: Compact the base layer; Step 4: Form the edge of the base layer; Step 5: Sprinkling cement slurry; Step 6: Maintenance.

[0009] This method of constructing the edge compaction of the cement stabilized base layer adopts the above steps to carry out construction operations on the cement stabilized base layer, assisted by the erection of a formwork, and can compact the cement stabilized base layer to make the water-stabilizing layer structure stable and meet the strength standards. The strength increases with age and the board body is quickly formed, so it has higher strength, better impermeability and frost resistance, and at the same time solves the problem of insufficient edge compaction.

[0010] Furthermore, in step one, cement, graded crushed stone, a binder and water are mixed and stirred, wherein the graded crushed stone is a mixture of any one or more of crushed stone, gravel, crushed stone soil, and gravel soil, and the binder is a mixture of one or both of slag and lime.

[0011] Cement, graded crushed stone, binder and water are used as mixed materials, which are mixed to form a base material for paving.

[0012] Furthermore, step 2 includes base preparation and cement stabilized base paving: Preparation of the base layer: determine the thickness and slope of the base layer and level it; lay a layer of crushed stone with a thickness of 10-15cm on the base layer as the base layer and roll it; Cement stabilized base layer paving: Lay a layer of cement stabilized gravel with a thickness of 5-10cm on the gravel base layer and use a paver to lay it evenly.

[0013] In step two, the base layer is paved in two steps, which are used to perform paving operations on the base layer. The preparation of the base layer is used to determine the parameter information of the base layer, and the cement stabilized base layer is paved to finally form a paved structure.

[0014] Furthermore, step three includes initial pressure and final pressure; Initial compaction: Use a light two-wheel roller or tire roller to perform static compaction and light rolling to initially form the shape of the base layer; Final compaction: Use a heavy-duty vibratory roller, three-wheel roller or tire roller for further compaction.

[0015] The base layer is compacted through two steps: initial compaction and final compaction. The operation is carried out in sections, and secondary compaction is carried out on the base layer to finally form a compacted base layer.

[0016] Furthermore, before setting up the formwork in step 4, it is necessary to determine the position and height of the formwork according to the design requirements, and clean up the debris on the edge of the base to ensure that the formwork can fit closely to the base; Use formwork equipment or tools to fix the formwork in the predetermined position to ensure the verticality of the formwork; During the mold erection process, pay attention to check whether the joints of the template are tight; After the formwork is completed, the formwork needs to be inspected and maintained regularly.

[0017] The edge of the base layer is subjected to a mold-setting operation. The purpose of the mold-setting operation is to restrict the outer side of the base layer to facilitate the subsequent cement slurry sprinkling operation, avoid cement slurry overflow, and ensure the effect of cement slurry spraying.

[0018] Furthermore, in step five, a cement slurry spreader is used to spread the cement slurry, and the mass ratio of cement to water in the cement slurry is 1:1 or 2:1; the spreading amount is 0.2kg / m².

[0019] Before sprinkling cement slurry, the corresponding cement slurry needs to be prefabricated and then sprayed according to the requirement of 0.2kg / m².

[0020] Furthermore, in step six, a layer of wet sacks and water-permeable non-woven geotextiles is covered on the surface of the base layer. After covering, a sprinkler truck can be used to spray the surface in time to keep the base layer moist; The curing time is 7-14 days.

[0021] Finally, the base layer should continue to be maintained for 7-14 days to ensure its normal service life.

[0022] Through the above scheme, the present invention has at least the following advantages: this cement-stabilized base layer edge compaction construction method, the effect of cement-stabilized base layer edge compaction is directly related to the overall quality of the base layer and the service life of the road, good edge compaction can significantly improve the tensile and impact strength of the base layer, effectively avoid and delay the occurrence of early road surface sinking, depression, cracking, falling off, potholes and other diseases, and use a tire roller. Its unique rolling method can better adapt to the shape of the edge and improve the compaction effect. The sprinkling of cement slurry meets the needs of cement hydration, keeps the surface of the base layer moist, and ensures that it can harden normally and increase its strength within a certain period of time, so that the edge pressure structure of the cement-stabilized base layer obtained by this method is stable and meets the needs of road construction.

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the construction steps of the present invention. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] See also Figure 1 A method for edge compaction of a cement stabilized base layer according to a preferred embodiment of the present invention comprises the following steps: Step 1: Material preparation; Step 2: paving the base layer; Step 3: Compact the base layer; Step 4: Form the edge of the base layer; Step 5: Sprinkling cement slurry; Step 6: Maintenance.

[0028] This cement stabilized base edge compaction construction method: 1. Edge shaping and preliminary compaction: After the mixture is spread, the edges should be quickly rolled with a tire roller or similar equipment to level them and ensure initial stability and flatness of the edges.

[0029] 2. Overlap rolling and edge reinforcement: When using a heavy roller (such as a three-wheel smooth roller, heavy tire roller or vibratory roller) for rolling, ensure that the edges are rolled enough times. Usually, the edges and shoulders should be rolled 2-3 times more to enhance the density and stability of the edges.

[0030] When rolling, the overlapping width is 1 / 2 of the width of the rear wheel to ensure uniform compaction of the edges and the entire base layer.

[0031] 3. Water content control and watering: During the rolling process, the moisture content of the mixture should be closely monitored. If the edges are dry, a small amount of water should be added in time to keep the edges moist and help the hydration of cement.

[0032] After rolling is completed, curing should be carried out immediately. During the curing period, the edges should always be kept moist. The method of covering with geotextile and sprinkling water can be used for curing.

[0033] 4. Compactness detection and adjustment: During the edge compaction process, the compaction degree should be tested regularly. If the compaction degree is found to be insufficient, the compaction process should be adjusted in time, such as increasing the number of rolling passes, adjusting the weight or vibration frequency of the roller, etc., to ensure that the edge meets the specified compaction requirements.

[0034] 5. Avoid damage and protect edges: During the rolling process, avoid "turning around" or emergency braking on the completed or rolling section to avoid damaging the edge surface.

[0035] For special parts of the edges (such as corners, seams, etc.), additional protective measures should be taken, such as using edge compactors for compaction, to ensure the density and stability of these parts.

[0036] In summary, the construction method of cement stabilized base edge compaction needs to comprehensively consider shaping and preliminary compaction, overlapping rolling and edge reinforcement, moisture content control and watering curing, compaction detection and adjustment, and avoiding damage and protecting the edge. Through scientific and reasonable construction methods, it can be ensured that the edge meets the specified density and stability requirements, thereby improving the quality and durability of the entire cement stabilized base.

[0037] Furthermore, in step one, cement, graded crushed stone, a binder and water are mixed and stirred, wherein the graded crushed stone is a mixture of any one or more of crushed stone, gravel, crushed stone soil, and gravel soil, and the binder is a mixture of one or both of slag and lime.

[0038] Step 1: Material preparation; Cement: It is one of the main materials for cement-stabilized base, and its quality and type have an important impact on the performance of the base. Common types of cement include Portland cement, ordinary Portland cement, etc. When selecting, the quality should be judged according to the standards, including initial setting time, final setting time, grouting strength and other indicators.

[0039] Graded crushed stone (or crushed stone, gravel, crushed stone soil, gravel soil, etc.): As aggregate, it plays a supporting and embedding role in the cement stabilized base. When selecting, ensure that the aggregate particle size meets the requirements and has no obvious cracks or broken defects.

[0040] Binders (such as slag, lime, etc.): Although not always necessary, in some cases binders may be added to improve the bond between cement and aggregate. These materials help to form a stronger base.

[0041] The base material is obtained by mixing cement, graded crushed stone, binder and water.

[0042] Furthermore, step 2 includes base preparation and cement stabilized base paving: Preparation of the base layer: determine the thickness and slope of the base layer and level it; lay a layer of crushed stone with a thickness of 10-15cm on the base layer as the base layer and roll it; Cement stabilized base layer paving: Lay a layer of cement stabilized gravel with a thickness of 5-10cm on the gravel base layer and use a paver to lay it evenly.

[0043] Step 2: paving the base layer; Base preparation: Determine the thickness and slope of the base layer and level it to ensure the firmness of subsequent layers of material.

[0044] A layer of crushed stone with a thickness of 10-15cm is laid on the base as the base layer, and rolled to achieve a certain density.

[0045] Cement stabilized gravel layer paving: A cement stabilized gravel layer with a thickness of 5-10cm (or adjusted according to specific requirements) is laid on the gravel base layer. The thickness of this layer should be adjusted according to actual conditions to ensure its bearing capacity and stability.

[0046] Use a paver for even paving, and assign a dedicated person to eliminate the segregation of coarse and fine aggregates behind the paver. Remove local coarse aggregate accumulation or segregation areas in a timely manner and fill them with freshly mixed materials.

[0047] Furthermore, step three includes initial pressure and final pressure; Initial compaction: Use a light two-wheel roller or tire roller to perform static compaction and light rolling to initially form the shape of the base layer; Final compaction: Use a heavy-duty vibratory roller, three-wheel roller or tire roller for further compaction.

[0048] Step 3: Compact the base layer; Rolling is performed to make the cement stabilized gravel layer reach the specified density. When rolling, pay attention to the weight of the machine and the pressure of the tires to avoid damage to the base layer.

[0049] During the rolling process, a dedicated person should be assigned to direct the work to ensure that there is no leakage and wheel marks. Usually, a rubber-wheeled roller is used for initial rolling, followed by a heavy-duty vibrating roller for compaction, and finally a double-steel-wheeled roller is used to roll the material to eliminate wheel marks.

[0050] Initial compaction: After the paver finishes paving the mixture, use a light two-wheel roller or tire roller immediately to perform static compaction and light rolling to initially form the shape of the base layer and lay the foundation for subsequent compaction.

[0051] Final compaction: Based on the initial compaction, use a heavy-duty vibratory roller, three-wheel roller or tire roller for further compaction. During the final compaction, ensure that the compaction thickness, compaction degree and other indicators meet the design requirements.

[0052] Compaction skills: During the rolling process, attention should be paid to the control of parameters such as overlapping width, rolling speed, and number of rolling passes. At the same time, avoid "turning around" or emergency braking on the completed or rolling section to avoid damaging the base surface.

[0053] Monitoring of compaction quality: During the construction process, there must be someone responsible for supervising and managing the compaction work. This includes continuous testing during the compaction process to ensure that various indicators such as thickness, width, compaction, moisture content, flatness, etc. meet the specification requirements.

[0054] Furthermore, before setting up the formwork in step 4, it is necessary to determine the position and height of the formwork according to the design requirements, and clean up the debris on the edge of the base to ensure that the formwork can fit closely to the base; Use formwork equipment or tools to fix the formwork in the predetermined position to ensure the verticality of the formwork; During the mold erection process, pay attention to check whether the joints of the template are tight; After the formwork is completed, the formwork needs to be inspected and maintained regularly.

[0055] Step 4: Form the edge of the base layer; The edge formwork of cement stabilized base is an important part of road construction. It is of great significance to ensure the neatness and stability of the edge of the base and the smooth progress of subsequent construction. The following is a detailed answer to the edge formwork of cement stabilized base: The edge formwork of the cement-stabilized base mainly uses special formwork equipment or tools, such as formwork artifacts, to fix and support the formwork to ensure the neatness and stability of the edges of the cement-stabilized base during paving and compaction.

[0056] Moulding equipment or tools: In actual construction, special equipment such as formwork tools are often used to assist in formwork. These devices are ingeniously designed to easily fix and support the formwork, ensuring that the formwork will not move or deform during the paving and compaction process.

[0057] Moulding operation: Before erecting the formwork, it is necessary to determine the position and height of the formwork according to the design requirements, and clean up the debris on the edge of the base layer to ensure that the formwork can fit tightly to the base layer.

[0058] Use formwork equipment or tools to fix the formwork in the predetermined position to ensure the verticality and stability of the formwork.

[0059] During the formwork process, pay attention to check whether the joints of the formwork are tight to avoid leakage or deformation.

[0060] Maintenance after mold erection: After the formwork is completed, the formwork needs to be inspected and maintained regularly to ensure that it remains stable throughout the construction process.

[0061] If the template is found to be loose or deformed, it should be adjusted or replaced in time to avoid affecting the quality of the base layer.

[0062] Related construction technology: When constructing a cement-stabilized base, in addition to erecting the formwork, attention should also be paid to quality control of the mixing, transportation, spreading and compacting of the mixture.

[0063] In particular, the mixture must be mixed evenly, segregation must be avoided during transportation, the thickness and flatness must be controlled during paving, and the compaction degree and density must meet the requirements during compaction.

[0064] Furthermore, in step five, a cement slurry spreader is used to spread the cement slurry, and the mass ratio of cement to water in the cement slurry is 1:1 or 2:1; the spreading amount is 0.2kg / m².

[0065] Step 5: Sprinkling cement slurry; Cement slurry sprinkling on cement stabilized base is an important part of road construction, which aims to enhance the strength and stability of the water-stabilizing layer and improve the service life of the road. The following is a detailed explanation of cement slurry sprinkling on cement stabilized base: Function and purpose: Cement slurry sprinkling can enhance the strength and stability of the water-stabilizing layer and improve the overall bearing capacity and durability by filling the cracks and voids in the water-stabilizing layer.

[0066] Sprinkling cement slurry can also improve the performance of the water-stabilizing layer, making it more resistant to compression and thus extending the service life of the road.

[0067] Operation requirements: Before sprinkling cement slurry, it is necessary to ensure that the tonnage of the cement slurry truck meets the project requirements, check the vehicle appearance and system, including the tank sealing, spraying system, etc., to ensure that there is no blockage or leakage, and ensure the normal operation of each system.

[0068] Adjust the slurry concentration and spraying pressure of cement slurry according to the project requirements to ensure uniform and stable spraying. At the same time, control the spraying speed and spraying distance to ensure that the coverage area and slurry thickness meet the design requirements.

[0069] During the operation, operators must wear safety equipment and are strictly prohibited from standing in the spraying area to avoid injury caused by splashing slurry.

[0070] Equipment and options: Cement slurry sprinkling is usually carried out using a cement slurry spreader. This type of vehicle is divided into self-propelled and trailer types. The selection needs to be determined based on specific construction requirements and project scale.

[0071] The vehicle's tonnage, construction efficiency, driving requirements, applicable terrain and road conditions, and safety issues are all factors that need to be considered when making a selection.

[0072] Construction precautions: When spraying cement slurry, make sure the vehicle is stable to prevent uneven spraying or waste of cement slurry.

[0073] Adjust the spraying thickness according to the design requirements and construction plan to ensure that the cement slurry forms a uniform coating on the surface of the water-stabilizing layer.

[0074] Reasonably control the spraying amount to avoid excessive waste or too little affecting the construction effect.

[0075] Mix ratio of cement slurry: The mix ratio of cement slurry is usually determined according to the project requirements and actual conditions. Generally speaking, the mass ratio of cement to water is 1:1 or 2:1. This ratio ensures that the cement slurry has appropriate fluidity and adhesion, thereby effectively covering and bonding the water-stabilizing layer.

[0076] Sprinkling amount: Sprinkling amount refers to the amount of cement slurry that needs to be sprinkled on each square meter of the water-stabilized layer. It directly affects the coverage effect and bonding strength of the cement slurry. The spreading amount is usually determined based on the engineering design requirements, the type of water-stabilized layer, the moisture content, and climate factors. For example, in some projects, 1:1 cement slurry should be sprinkled between two layers of cement-stabilized crushed stone, and the spreading amount is 0.2kg / m².

[0077] Furthermore, in step six, a layer of wet sacks and water-permeable non-woven geotextiles is covered on the surface of the base layer. After covering, a sprinkler truck can be used to spray the surface in time to keep the base layer moist; The curing time is 7-14 days.

[0078] Step 6: Maintenance: The maintenance operation process of cement stabilized base mainly includes the following steps: 1. Maintenance start time and cycle: The cement-stabilized base should be maintained immediately after construction to ensure its normal service life.

[0079] The curing time is generally not less than 7 days, and it is also recommended that the curing time be 14 days or longer to ensure that the cement stabilized base reaches sufficient strength.

[0080] 2. Maintenance method: Moisture maintenance: Cover the surface of the base with a layer of moist sacks, permeable non-woven geotextiles or other suitable materials and keep it moist. After covering, sprinkle with a sprinkler truck to keep the base moist.

[0081] Spray maintenance: Use a water spray truck to spray water mist on the surface of the base. The spraying time should be reasonably arranged according to the season and weather conditions. Generally, maintenance should be carried out two to three times to ensure that the base remains moist.

[0082] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for compacting the edge of a cement stabilized base, characterized in that: The steps include: Step 1: Material preparation; Step 2: paving the base layer; Step 3: Compact the base layer; Step 4: Form the edge of the base layer; Step 5: Sprinkling cement slurry; Step 6: Maintenance.

2. A cement stabilized base edge pressing construction method according to claim 1, characterized in that: In step one, cement, graded crushed stone, a bonding material and water are mixed and stirred, wherein the graded crushed stone is a mixture of any one or more of crushed stone, gravel, crushed stone soil, and gravel soil, and the bonding material is a mixture of one or both of slag and lime.

3. A cement stabilized base edge pressing construction method according to claim 1, characterized in that: Step 2 includes base preparation and cement stabilized base paving: Preparation of the base layer: determine the thickness and slope of the base layer and level it; lay a layer of crushed stone with a thickness of 10-15cm on the base layer as the base layer and roll it; Cement stabilized base layer paving: Lay a layer of cement stabilized gravel with a thickness of 5-10cm on the gravel base layer and use a paver to lay it evenly.

4. A cement stabilized base edge pressing construction method according to claim 1, characterized in that: Step three includes initial pressure and final pressure; Initial compaction: Use a light two-wheel roller or tire roller to perform static compaction and light rolling to initially form the shape of the base layer; Final compaction: Use a heavy-duty vibratory roller, three-wheel roller or tire roller for further compaction.

5. The method for edge compaction of a cement stabilized base according to claim 1, characterized in that: Before setting up the formwork in step 4, it is necessary to determine the position and height of the formwork according to the design requirements, and clean up the debris on the edge of the base to ensure that the formwork can fit closely to the base; Use formwork equipment or tools to fix the formwork in the predetermined position to ensure the verticality of the formwork; During the mold erection process, pay attention to check whether the joints of the template are tight; After the formwork is completed, the formwork needs to be inspected and maintained regularly.

6. A cement stabilized base edge pressing construction method according to claim 1, characterized in that: In step 5, a cement slurry spreader is used to spread cement slurry, and the mass ratio of cement to water in the cement slurry is 1:1 or 2:1; the spreading amount is 0.2kg / m².

7. The method for edge compaction of a cement stabilized base according to claim 1, characterized in that: In step 6, a layer of wet sacks and permeable non-woven geotextiles is covered on the surface of the base layer. After covering, a sprinkler truck can be used to spray the surface in time to keep the base layer moist; The curing time is 7-14 days.

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