Low-carbon port open yard paving structure
By adopting a low-carbon pavement structure in the port's open storage yard, consisting of a solidified dredged soil subbase, a recycled graded aggregate base, and a high-strength interlocking block pavement layer, the problems of high cost and improper dredged soil treatment in traditional pavement structures have been solved, achieving resource recycling and environmental friendliness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN PORT (GROUP) COMPANY
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional port open-air storage yards have high material costs and large carbon emissions, and improper handling of dredged soil leads to land occupation and environmental pollution.
The solidified dredged soil is used as the subbase, the base layer uses recycled graded aggregate, the surface layer is high-strength interlocking blocks, combined with the leveling sand cushion layer, to form a low-carbon surface structure, realizing the resource utilization of dredged soil and the recycling of construction waste.
It reduces engineering costs, carbon emissions, enhances the load-bearing capacity and durability of the stockpile, reduces dependence on natural resources, solves the problem of dredged soil disposal, and conforms to the concepts of green building and sustainable development.
Smart Images
Figure CN224494787U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of port infrastructure construction technology, and in particular relates to a low-carbon port open-air storage yard pavement structure. Background Technology
[0002] As a crucial component of port logistics operations, the design of open-air storage yards directly impacts their load-bearing capacity, durability, construction costs, and environmental impact. Traditional pavement structures typically employ cement concrete or asphalt concrete surface layers, with inorganic binder-stabilized base courses and granular subbase courses. Inorganic binder-stabilized base courses include cement-stabilized, cement-fly ash-stabilized, and lime-fly ash-stabilized types, while granular subbase courses include graded crushed stone and graded gravel. This type of pavement structure usually results in higher carbon emissions, resource consumption, and construction costs.
[0003] With increasing global emphasis on environmental protection and sustainable development, the application of green and low-carbon technologies in port infrastructure construction is gaining increasing attention. In response to this trend, how to innovatively design a pavement structure that can fully meet the functional requirements of port storage yards while effectively reducing carbon emissions and promoting resource recycling has become a pressing technical challenge for both industry insiders and outsiders. The large amount of dredged soil generated during port dredging operations, which is not effectively treated and utilized, occupies significant land resources and may pose potential environmental hazards. Therefore, exploring resource utilization pathways for dredged soil is also a crucial issue that urgently needs to be addressed in the current port construction sector. Utility Model Content
[0004] In view of this, the purpose of this utility model is to provide a low-carbon port open-air storage yard pavement structure to alleviate the increase in engineering costs caused by the rising material costs of traditional pavement structures, and to solve the problems of land occupation and environmental pollution caused by dredged soil stockpiling.
[0005] In a first aspect, this utility model embodiment provides a low-carbon port open-air storage yard pavement structure, which includes, from top to bottom, a pavement layer, a leveling sand cushion layer, a base layer, and a subbase layer. The base layer is laid on the subbase layer, the top surface of the base layer is covered with a leveling sand cushion layer, and the top surface of the leveling sand cushion layer is covered with a pavement layer.
[0006] The subbase uses solidified dredged soil, and the base course uses recycled graded aggregate.
[0007] Preferably, the pavement layer is a high-strength interlocking block pavement layer with a thickness of 10-15cm and a flexural strength of not less than 4MPa at 28 days.
[0008] Preferably, the leveling sand cushion layer has a thickness of 3-5 cm, a mud content of less than 3%, and is evenly and loosely laid on the top surface of the base layer.
[0009] Preferably, the thickness of the base layer is 15-22cm, and the recycled graded aggregate is a material made by mixing construction waste, including but not limited to concrete and brick, after crushing, washing, and grading, according to a certain particle size ratio and gradation requirements; wherein the concrete particle content is not less than 90%, the crushing value is not higher than 30%, and the content of needle-like and flaky particles is not higher than 18%.
[0010] Preferably, the thickness of the subbase is 20-100cm, and its 7-day unconfined compressive strength is 2-5MPa.
[0011] The present invention provides the following beneficial effects:
[0012] This utility model's pavement structure consists of a surface layer, a base layer, and a subbase layer. The surface layer utilizes interlocking blocks to enhance stability and durability. Its modular design and ease of replacement allow for repairs without large-scale destruction of the original pavement structure, reducing subsequent maintenance costs, shortening the maintenance period, minimizing the impact of repair work on port operations, and improving port yard operational efficiency. The base layer uses recycled graded aggregates, achieving resource utilization of waste and effective recycling of construction waste, significantly reducing the need for natural resource extraction, thereby significantly reducing carbon emissions and environmental pollution. Simultaneously, using solidified dredged soil as the subbase layer material effectively solves the problem of large-scale dredged soil stockpiling generated from port dredging operations, avoiding waste of land resources and potential environmental risks. The subbase layer uses solidified dredged soil, with the solidification process improving the soil's bearing capacity.
[0013] This utility model realizes the resource utilization of construction and environmental waste, reduces dependence on natural sand and gravel materials, and effectively controls engineering costs, providing an economical and efficient solution for port infrastructure construction. The pavement structure design features low investment, short construction period, convenient maintenance, and environmental friendliness, while significantly reducing carbon emissions from port operations and improving the load-bearing capacity and durability of storage yards. Furthermore, the pavement structure is green, low-carbon, and easy to repair, with excellent load-bearing capacity and durability, making it suitable for container yards and bulk cargo yards of all grades. It not only meets the functional requirements of port storage yards but also embodies the concepts of green building and sustainable development, possessing significant practicality and promotional value.
[0014] Other features and advantages of this invention will be set forth in the following description, and some features will become apparent from the description or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.
[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the low-carbon port open-air storage yard pavement structure according to an embodiment of the present utility model.
[0017] In the attached diagram, the symbols represent the following structures: 1-surface layer, 2-base layer, 3-subbase layer, 4-leveling sand cushion layer. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Based on this, the present invention provides a low-carbon port open-air storage yard pavement structure, such as... Figure 1 As shown, from top to bottom, it includes surface layer 1, base layer 2, and subbase layer 3. Base layer 2 is laid on the subbase layer 3, and a leveling sand cushion layer 4 is set between the top surface of base layer 2 and surface layer 1. The subbase layer 3 is made of solidified dredged soil, and the base layer 2 is made of recycled graded aggregate.
[0020] The pavement layer 1 is a high-strength interlocking block pavement layer with a thickness of 10-15cm and a flexural strength of not less than 4MPa at 28 days. The maximum joint width between the interlocking blocks should be less than 5mm, and the average joint width should not be greater than 3mm. The interlocking blocks are laid in sections and zones.
[0021] Furthermore, high-strength interlocking blocks are chosen because of their modular design and ease of replacement, eliminating the need for large-scale damage to the original pavement structure during repairs.
[0022] The base layer 2 uses recycled graded aggregate with a thickness of 15-22cm. The recycled graded aggregate refers to a material made by mixing waste concrete, bricks and other construction waste through a series of processing processes, including crushing, washing and grading, according to a certain particle size ratio and gradation requirements; wherein the concrete particle content is not less than 90%, the crushing value is not higher than 30%, and the content of needle-like and flaky particles is not higher than 18%.
[0023] The subbase 3 is made of solidified dredged soil with a thickness of 20-100cm and a 7-day unconfined compressive strength of 2-5MPa.
[0024] Furthermore, solidified dredged soil was chosen to improve the soil's bearing capacity through the solidification process.
[0025] The leveling sand cushion layer 4 is evenly and loosely laid on the top surface of the base layer 2, with a thickness of 3-5cm and a mud content of less than 3%.
[0026] The construction steps of this utility model are as follows:
[0027] 1. Construct a 60cm subbase. 3. First, perform foundation treatment. The foundation bearing capacity after treatment should not be less than 120kPa, and it should be stable, dense, uniform, and have sufficient strength. Prepare solidified dredged soil in advance to prepare the subbase layer. That is, spread the prepared solidified dredged soil in layers with a thickness of 20cm and compact it.
[0028] The process for preparing solidified dredged soil is as follows: dredged soil is mixed with a solidifying agent, stirred until homogeneous, and then compacted. The dosage of the solidifying agent should be determined through testing. In this embodiment, the basic physical properties of dredged soil from a port are shown in Table 1.
[0029] Table 1 Basic Physical Properties of Dredged Soil
[0030]
[0031]
[0032] In this embodiment, the mix proportions and basic physical and mechanical properties determined by experiments are shown in Table 2.
[0033] Table 2 Mix proportions and basic physical and mechanical properties of dredged and solidified soil
[0034]
[0035] The specimen preparation and unconfined compressive strength testing methods were carried out in accordance with Appendices A and B of the "Specification for Cement-Soil Mix Proportion Design" (JGJ / T233—2011).
[0036] 2. Construct a 20cm base course 2 on the top surface of the subbase course 3. Use a paver to lay the recycled graded aggregate evenly, with a loose paving coefficient of 1.25, and compact it using a 12t roller. In this embodiment, the recycled graded aggregate contains 92% concrete particles, has a crushing value of 20%, and contains 10% needle-like and flaky particles. The particle size distribution is shown in Table 3.
[0037] Table 3. Particle composition of recycled aggregate
[0038]
[0039] 3. Construct a 5cm leveling sand cushion layer 4 on the top surface of base layer 2. The sand cushion layer is evenly and loosely spread on the top surface of base layer 2, and no vehicles or people are allowed to walk or stand on it. It is then leveled according to the slope requirements. In this embodiment, the particle size distribution of the sand cushion layer is shown in Table 4.
[0040] Table 4. Particle composition of sand cushion layer
[0041]
[0042] 4. Construct a 13cm paving layer 1 on top of the leveling sand cushion layer 4. First, a simulation arrangement should be conducted before paving to determine the interlocking block paving scheme. Second, control lines should be drawn during paving, with the road segment length and the edge line of the storage yard zone being 5m, and paving should proceed in a herringbone pattern from the bottom slope to the ridge. Finally, after paving, a high-powered plate vibrator should be used to vibrate and compact the top surface 2-3 times.
[0043] In this embodiment, the maximum gap width between interlocking blocks should be less than 5mm, the average gap width should not be greater than 3mm, and the interlocking blocks should be laid in segments and zones.
[0044] 5. Water and maintain for 5-7 days.
[0045] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A low-carbon port open-air storage yard pavement structure, characterized in that, From top to bottom, it includes a surface layer, a leveling sand cushion layer, a base layer, and a subbase layer. The base layer is laid on the subbase layer, the top surface of the base layer is covered with a leveling sand cushion layer, and the surface layer is laid on the top surface of the leveling sand cushion layer. The subbase uses solidified dredged soil, and the base course uses recycled graded aggregate.
2. The low-carbon port open-air storage yard pavement structure according to claim 1, characterized in that, The pavement layer is a high-strength interlocking block pavement layer with a thickness of 10-15cm and a flexural strength of not less than 4MPa at 28 days.
3. The low-carbon port open-air storage yard pavement structure according to claim 2, characterized in that, The maximum gap width between interlocking blocks is less than 5mm, the average gap width is no more than 3mm, and the interlocking blocks are laid in sections and zones.
4. The low-carbon port open-air storage yard pavement structure according to claim 1, characterized in that, The leveling sand cushion layer has a thickness of 3-5cm, a mud content of less than 3%, and is evenly and loosely laid on the top surface of the base layer.
5. The low-carbon port open-air storage yard pavement structure according to claim 1, characterized in that, The thickness of the base layer is 15~22cm, and the recycled aggregate includes construction waste from concrete and brickwork. The concrete contains no less than 90% particles, no more than 30% crushing value, and no more than 18% needle-like and flaky particles.
6. The low-carbon port open-air storage yard pavement structure according to claim 1, characterized in that, The thickness of the subbase is 20~100cm, and its 7-day unconfined compressive strength is 2~5MPa.