The construction period of municipal landscape engineering is long, and the construction involves many contents, which increases the difficulty of project cost management to some extent. However, municipal landscape engineering plays an extremely important role in urban construction, and its construction quality can often directly affect the image of the city. Therefore, the construction unit should strengthen the control of landscape engineering construction, especially pay attention to the cost control of landscape engineering. This is because the cost control of municipal landscape engineering can ensure the construction quality of landscape engineering and effectively control the construction cost.

2 municipal garden project cost management problems

2. 1 project cost decision-making First of all, there are some problems in the cost decision-making stage of municipal garden projects, which have a negative impact on project cost management. Because the cost decision-making stage of landscape engineering is an important stage of cost management, in this stage, relevant staff are required to audit the project cost plan in accordance with relevant regulations to avoid unreasonable parts and realize the optimization of the project cost plan. However, some construction units are not well managed in the decision-making stage of municipal garden project cost, which leads to some problems that affect the project cost management. Common problems are mainly reflected in the following two aspects: First, the cost management of square bricks and granite plates is not perfect, because a large number of decorative materials are involved, and the types and specific quantities used are different, which further increases the difficulty of cost management. The cost management of greening main materials is not strong enough, mainly including trees, shrubs and herbs which are most used in municipal landscape engineering. When purchasing these greening main materials, the construction unit should not only consider purchasing, but also pay attention to accounting transportation costs. Some construction units did not carefully check the cost list when purchasing greening main materials, which laid a hidden danger for the cost management of municipal landscape engineering.

2.2 Problems in the design stage At the same time, the design stage of municipal landscape engineering is another important stage of municipal engineering cost management. At the same time, once the construction unit does not control this link well, the project cost will easily increase. In order to save time, some designers neglected the preliminary investigation of the site environment when designing municipal landscape engineering, which led to loopholes in the design scheme. Once the construction is carried out according to this design scheme, it is easy for the design to be inconsistent with the actual situation, which will lead to the increase of construction cost. Some designers blindly pursue the color matching of landscape engineering, without considering the planting conditions and survival rate of seedlings, resulting in a large number of plants dying in greening, which not only wastes resources, but also increases the project cost and affects the effect of municipal landscape engineering cost management.

2.3 Problems in the construction stage, which is an important stage of municipal landscape engineering. At this stage, the constructors can turn the engineering design scheme into real objects, which is also an important link in the engineering cost management. In the construction stage of municipal landscape engineering, it is easily influenced by various factors, which leads to the emergence of engineering changes and increases the project cost. Including building materials, construction equipment and construction personnel, as an important part of the cost management of municipal landscape engineering, once there are changes, such as material changes, it will have a certain impact on the cost of municipal landscape engineering, and even lead to construction interruption and increase the cost of the project. 2.4 Problems in the maintenance management stage Compared with other projects, municipal landscape engineering has certain particularity, that is, it needs later maintenance management. This is because the greening plants in landscape engineering are alive, and once they are not properly maintained, they may be damaged or even killed, leading to an increase in project cost. At present, there is a general problem of lack of reasonable maintenance in municipal garden projects in China, which has a negative impact on project cost management. The reasons for this problem mainly include the following two aspects: First, the lack of maintenance and management personnel. Second, the maintenance management lacks sufficient financial support, which leads to improper maintenance management and ineffective implementation of municipal landscape engineering, which greatly reduces the survival rate of seedlings and increases the cost of landscape engineering.

3 Suggestions on strengthening the cost management of municipal landscape engineering

3. 1 Strengthening the cost management in the decision-making stage The construction unit and relevant staff should strengthen the cost management in the decision-making stage to lay a good foundation for the cost management of municipal garden projects. This requires the construction unit and staff to fully understand the actual situation of the project at this stage, judge the rationality of the decision according to the relevant standards, and ensure the effect of municipal garden project cost management to the maximum extent. At the same time, at this stage, once the deficiencies in the project decision are found, they should be improved immediately to optimize the project cost decision, so as to ensure that the project cost management results can meet the relevant requirements.

3.2 Strengthen the cost management in the design stage. The construction unit and relevant staff should also pay attention to the effective cost management in the design stage of municipal landscape engineering. This requires the construction unit to pay attention to the following aspects: first, designers are required to comprehensively consider the cost of landscape engineering, rather than just paying attention to the visual effect and artistry of landscape greening. Only in this way can the design scheme meet the requirements of cost management effectively. Second, the whole design process. This requires cost control personnel to track the whole design process of landscape engineering, ensure that the design scheme is consistent with the actual environment of the construction site, and make a reasonable evaluation of the design scheme according to relevant standards, and constantly optimize the deficiencies in the design scheme, so as to improve the design scheme and realize the reasonable control of the project cost. In a word, the construction unit should pay attention to effective cost control in the design stage of landscape engineering, ensure the rationality and feasibility of the engineering design scheme to the maximum extent, and avoid the engineering change and increase the engineering cost due to unreasonable design in the construction process.

3.3 Strengthen the cost management in the construction stage. The construction unit should also strengthen the cost management in the construction stage and effectively control the factors that may affect the project cost in the construction process. This requires the construction unit to pay attention to the following four points: First, reasonably control the labor cost, ensure the reasonable composition of construction personnel, ensure that the collocation and number of each type of work meet the relevant requirements, strictly control the problem of surplus personnel, and achieve effective control of labor costs. Second, the reasonable control of material cost requires the construction unit to pay attention to the selection, procurement, transportation and storage of materials. Whether the quality of selected materials is unqualified, the purchase cost is too high, the transportation cost of materials is high, or the materials are stored unreasonably, it will have an adverse impact on the cost management of landscape engineering. Therefore, the construction unit should pay attention to the material quality and control of these links. At the same time, construction personnel should be required to use materials. Follow the principle of taking materials on demand to avoid unnecessary waste of materials and increase the project cost. Third, reasonably control the cost of construction equipment. Similar to material cost control, the construction unit should make standard requirements for equipment selection, procurement, transportation and requisition to ensure effective control of equipment cost. In addition, the construction unit should also pay attention to the maintenance of equipment to ensure that the equipment can maintain a stable running state. Avoid the adverse impact of failure on the cost control of landscape engineering. Fourthly, we should also pay attention to the formulation of landscape contracts to ensure that they can give full play to the legal basis. This requires the construction unit and relevant staff to strengthen their understanding of the contract law, improve their legal awareness, and fully grasp the relevant terms when signing the contract, so as to avoid disputes and claims and threaten the economic interests of the construction unit.

3.4 Strengthen the cost management in the maintenance stage. Attach importance to the necessary maintenance management of landscape engineering to improve the survival rate of greening plants and realize effective control of greening costs. This is because the maintenance stage of landscape engineering is an important stage of cost control, which is directly related to whether the budget can be exceeded. Therefore, the construction unit should implement the necessary cost management means in the maintenance stage of landscape engineering.

Conclusion To sum up, it is very important to implement the cost management measures of municipal landscape engineering, which can not only effectively ensure the quality of municipal landscape engineering, but also effectively ensure the economic benefits of the construction unit and make certain contributions to the urban ecological environment.

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