Musical Fountain Construction Requirements and Plans

1. Project Overview

In the middle of the area, the entire planned area of ??the land extends to Xinrong Road in the east and Nanshan Road in the south. It is bounded by Shili Avenue in the west and Changjiu Expressway in the north, with a total land area of ??1,433.3 acres, including 715.7 acres for the park (Luoshan Mountain) and 113.2 acres for the construction of the central square on the west side of the mountain. The park will combine garden culture and historical and cultural techniques, and use Lianxi culture as the carrier to build cultural and leisure squares, citizen service centers, cultural exhibition centers, musical fountains and other landscapes. It will be a regional park integrating administration, leisure, culture and ecology. Comprehensive park. Among them, the musical fountain is located in the center of the Nanshan Park Citizen Square, with a circular setting and a diameter of 15.50m; the bottom surface of the foundation is 0.2m graded gravel, the foundation cushion is 0.1mC15 plain concrete, and the concrete grade of the pool bottom, pool wall, roof, and column is all C25 , the impermeability grade is S6.

2. Construction preparation

Investigate and analyze the construction difficulty conditions of each construction section, the layout of the construction site, and survey, etc., make arrangements by sections, understand the current site elevation, and review Measure and confirm coordinate points and elevations. Equipped with sufficient construction machinery, equipped with sufficient labor force, and good material supply, laying the foundation for the implementation of the overall progress plan.

(1) Preparation of technical force

Establish a technical team headed by the technical director of our company, based on the system to ensure the correctness of system implementation. Arrange technical personnel with rich construction experience to station at the site.

Read the construction drawings carefully, fully understand them, and consider them carefully so that the design intentions can be fully reflected during construction.

(2) Construction machinery and equipment

Implement the machinery and equipment required for the project.

Implement machine construction personnel who are experienced in mechanical repair and maintenance.

Set up a mechanical inspection system so that after every day's work is completed, timely inspections are made, and problems are repaired in a timely manner to ensure normal construction of the project.

(3) Preparation of materials and supplies

Prepare the arrival plan of materials and supplies according to the overall progress plan.

Be well aware of the materials required on site. Proper deployment and sufficient preparation.

Adjust the preparation plan at any time to ensure the smooth progress of on-site construction.

According to the profession and process, there are dedicated personnel in charge.

(4) Labor force preparation

Arrange sufficient construction teams required for the project and equip reserve forces, and organize the labor force to enter the site according to the labor force plan.

Select personnel with good qualities, safety awareness, high technical level, and experience in similar project construction.

3. Construction Guiding Ideology

The construction of this project is guided by the guiding ideology of “One Civilization, Two Key Points, and Three Guarantees”.

1. A civilization:

Arrange construction sites, construction sequences and scientific construction methods scientifically and rationally, and do a good job in civilized construction projects.

2. Two key points:

Focus on civilized construction and green environmental protection to eliminate environmental pollution;

Focus on quality and safety, a century-old plan, and quality first. 1. Eliminate hidden dangers.

3. Three guarantees:

Ensure project quality: establish and improve the quality assurance system, operate in strict accordance with the IS09001 quality assurance system, organize standardized and standardized operations, and comprehensively carry out quality excellence activities, Control and evaluate project quality in accordance with relevant standards and requirements to ensure that the project quality level is qualified.

Ensure construction deadlines. In the construction stage, the construction climax can be quickly reached. During the construction process, network planning is used to organize the construction, and the key lines that control the construction period are closely grasped. Parallel organization and flow operations are carried out, and multiple blocks are reasonably divided to ensure the realization of the construction period goals.

Ensure construction safety: Establish and improve a safety guarantee system, formulate safety production and construction rules, determine a reward and punishment system, strictly organize safety protection, establish the concept of "safe construction, everyone is responsible", and ensure that safety goals are achieved .

(2) In addition to the preparation principles of this construction plan according to the conventional construction methods, the supplementary principles are determined as follows based on the special requirements of the geographical location, construction environment, hydrogeological data and design of the project:

1. In order to ensure project quality, the construction methods and techniques used in each individual project must be the most mature, reliable and effective.

2. The construction process highlights scientific management.

3. The use of information management during the construction process is also the key point in the design and preparation of this construction organization, which is mainly reflected in the following four aspects:

Monitoring and management:

Project safety, quality, progress and environmental protection shall be monitored and managed.

Production management:

Analyze the primary and secondary relationships of each branch and sub-project, and make the schedule arrangement scientific and rigorous so that the project construction can proceed smoothly.

Technical management:

The construction plan is scientific, reasonable and operable.

Computer-aided management:

Use planning, cost and other management software to control and manage the project.

IV. Construction technology

(1) Earth excavation

1. Make preparations for construction and carry out measurement and setting out. According to the soil quality and excavation depth, construction shall be carried out according to the requirements of the construction plan. The soil at the bottom of the trench shall not be disturbed during excavation. If over-excavation is found, it is strictly prohibited to backfill with soil. Drainage in the trench must be done well, and the bottom of the trench must not be soaked by water.

2. During the trenching process, a backhoe excavator is used, and a dedicated person is responsible for digging the trench. When digging the trench, stop mechanical excavation when it reaches 200mm above the design elevation. After the trench bottom is dry, clean the trench bottom manually to ensure that the trench bottom elevation is correct and flat, and the soil at the bottom of the trench is not disturbed.

3. After the foundation trench is excavated, acceptance inspection should be organized in time. After the acceptance is passed, the next process of construction should be carried out in time to reduce the time of drying the trench as much as possible. Weather changes should be grasped in time during construction and the next step should be done well. Preparations before the rain.

4. The excavated earth must be piled according to the requirements of the construction plan and shall not be piled on the edge of the trench to avoid overloading the ground and causing earth displacement, collapse, etc.

5. Insufficient excavation size: the excavation width at the bottom of the foundation pit (trough) or pipe trench, in addition to the structural width, increases the working surface width according to construction needs.

6. The slope of the foundation pit (trough) or pipe ditch is not straight and uneven, and the base is uneven: inspections should be strengthened, repairs should be made as they are excavated, and acceptance should be carefully checked.

(2) Formwork production and installation

1. The formwork is designed and produced strictly in accordance with the construction drawings and building structure dimensions.

2. The formwork support ensures firm support, stable erection, sufficient rigidity and strength, and can withstand various loads during concrete pouring.

3. Before the formwork is erected, surveyors will first lay out the structural edges, axes, and elevation control points of the building according to the construction drawings, and clearly mark them. The construction personnel will strictly follow the measurement points to erect the formwork. The support deviation should meet the allowable deviation regulations for formwork production. After the formwork is erected and passed the inspection and acceptance by quality inspection and measurement personnel, the next construction process can be carried out.

4. After each use of the template, clean it, trim it, and apply release agent.

5. The formwork removal time shall be carried out in accordance with the construction drawings and specifications.

6. The formwork must be firmly supported and stable, and there must be no looseness, mold running, excessive sinking, etc.

7. The seams of the template should be smooth and tight without leakage of slurry. The inner surface of the mold should be cleaned and water-stop tape should be applied inside the seams to prevent leakage of slurry.

8. Before the formwork is installed, it must be laid out correctly and the formwork can be installed only after checking that it is correct.

(3) Production and installation of steel bars

Materials and main machines and tools:

○1 Steel bars: There should be factory certificates and mechanical properties retest according to regulations. When special circumstances such as brittle fracture occur during processing, chemical composition testing is also required. The steel bars should be free of rust and oil stains.

○2 Iron wire: No. 20~22 iron wire (fired wire) or galvanized iron wire (lead wire) can be used.

○3 Control the mortar pads and plastic cards used for the concrete protective layer.

○4 Tools: Rebar hooks, crowbars, steel plates, lashing racks, wire brushes, trolleys, chalk, rulers, etc.

Preparation and installation of steel bars

A. Foundation steel bars

○1 The base plate is double-layer steel bars. After tying the lower steel bars, place steel stirrups or Reinforcement brackets (the spacing should be about 1.5 meters apart) are placed on the stirrups to position the steel bars in both horizontal and vertical directions. The upper and lower order of the steel bars and the fastening method are the same as the lower steel bars of the floor.

○2 When tying steel bars, the intersection points of the two rows near the periphery are tied, and the intersection points in the middle part can be tied staggeredly. If one side buckle is used, the direction should be changed in a staggered manner, or a figure-eight buckle can be used, but the steel bar must not be displaced.

○3 Place mortar pads for the bottom concrete protective layer. The thickness of the pads is equal to the thickness of the protective layer and placed in a plum blossom pattern every 1 meter or so.

B. Column reinforcement

Install the lamppost reinforcement skeleton: Calculate the number of stirrups for each column according to the drawing requirements and spacing, and first put the stirrups on the protruding strips of the lower layer. Connect the bars, and then erect the column steel bars. Within the overlapping length, there should be no less than 3 fasteners, and the fasteners should be toward the center of the column. The overlapping multiple should not be less than 35d, and the elevation line should be aligned. After the skeleton is adjusted, stirrups in the root density area can be tied. The number of tied, missing and loose steel bars shall not exceed 10% of the number of tied openings and shall not be concentrated. The hooks should be oriented correctly, the joints should be tied, and the test pieces should be taken as required. The mechanical performance test results must comply with the steel welding and acceptance specifications.

(4) Concrete pouring quality control

1. Check the quality, quantity and position of the formwork one by one and make records.

2. Remove silt and debris from the formwork that is in direct contact with the concrete and moisten it with water. Gaps in the formwork should be sealed tightly.

3. Prepare heatstroke prevention items according to project needs.

4. Concrete should be poured continuously and should be completed at one time as much as possible. When intervals are required, the interval time should be shortened as much as possible and the second layer of concrete should be poured before the front layer of concrete solidifies.

5. When using a vibrator to tamp concrete, the vibrating time, vibrating point spacing and insertion depth should be strictly controlled to avoid leakage of vibration at the intersection of each pouring zone. To improve the holding force between concrete and steel bars and increase the density, the concrete should be tamped until floating slurry appears on the surface and no longer sinks.

6. Surface and bleeding treatment: The cement mortar on the surface of the concrete after pouring and molding is relatively thick. It should be scraped with a scraper at the designed elevation to drive away surface bleeding. Before initial setting, it should be rolled repeatedly. Use a wooden trowel to rub the surface 2-3 times to close water cracks.

7. Increase measurement intensity and on-site tracking and control to ensure accurate concrete baselines and dimensions.

(5) Waterstop quality control

1) Waterstop construction method

The waterstop is poured and buried during the concrete pouring process. in concrete. Before pouring concrete, it should be kept flat at the interface, and the joints should be bonded and tightened. Then, pour it fully with appropriate force and vibrate the concrete to position the waterstop so that it is well combined with the concrete to avoid affecting the stopper. water effect.

2) Precautions for waterstop construction

A. When fixing the waterstop, do not damage the main body.

B. When positioning the waterstop, be sure to keep it flat at the interface. If any flatness is found, it should be adjusted in time.

C. When pouring the fixed waterstop, the waterstop should be prevented from deflecting to avoid shortening on one side and affecting the waterstop effect.

D. When pouring concrete, it must be fully vibrated to avoid poor combination between the waterstop and concrete and affecting the waterstop effect.

(6) Construction of waterproof layer:

(1) Basic regulations: The surface of the base layer should be flat, solid, rough, and clean. The cement mortar waterproof layer requires that the surface be fully moist and free of water. ; The waterproof layer of cement mortar mixed with additives must be spread in two layers regardless of the front surface or the back surface. The surface should be calendered and the total thickness should not be less than 20mm; the inner and outer corners of the structure should be rounded with an average arc radius. The inner angle is 50mm and the outer angle is 10mm. The construction joints of the waterproof layer need to be in the shape of slopes and steps, and they should be constructed continuously in accordance with the order of layering operations, and the layers should be closely overlapped. The location of the anchorage should generally be left on the ground or on the wall, but it must be 200mm away from the yin and yang corners.

(2) Operation process: The base layer for paving the waterproof layer must be completed according to the design, and dried after curing, with a moisture content of no more than 9%; the base layer should be flat, firm, clean, and free from hollowing and cracking. , no sand; the base surface should be cleaned before applying primer during waterproofing layer construction; construction materials are all flammable, so corresponding fire-fighting equipment should be prepared.

(3) Process flow:

A. Base layer cleaning: Clean the qualified base layer before construction.

B. Apply base treatment agent: Apply a layer of neoprene asphalt adhesive diluted with gasoline on the surface of the base layer. The application should be even and non-transparent.

C. Paving an additional layer: paving an additional layer of roll material at the pipe root and yin and yang corners. Cut the roll material into corresponding shapes according to specifications and design requirements for paving.

D. Paving membrane: Cut the modified asphalt waterproof membrane according to the paving length and roll it for later use. During operation, insert the rolled membrane into the roll with a diameter of 30 mm. Center, the ends of the coil are aligned with the starting point for paving, ignite the gasoline blowtorch or special flame spray gun, heat the junction between the base layer and the coil, keep the distance of the spray gun about 300mm from the heating surface, spray and bake back and forth, and observe the condition of the coil. When the asphalt has just melted, the two ends of the hand-held pipe core are laid forward slowly. It is required to use even force and no air pockets. The width of the laying edge should be controlled well. The overlap width is 80mm for the full-paste method and 100mm for the strip-glue method. .

E. Hot-melt edge sealing: Make a protective layer of cement mortar or fine stone concrete on the flat surface; after the construction of the waterproof layer on the facade, spread the gravel in time and then apply the protective layer of cement mortar.

(7) Paving

1) Granite material requirements

Each type of stone should meet and comply with the construction unit and design requirements, and more importantly, Engineering requirements. During the supply process, the stone grade or supply source shall not be changed. The quality of the board is guaranteed to be strong and durable, without compromising strength or obvious appearance defects. The tone and pattern of the board must be coordinated and unified, and defects such as pits, scratches, missing edges, missing corners, cracks, stains, and color lines are not allowed in the front appearance. The allowable size deviations, allowable limit tolerances of flatness, allowable limit tolerances of angles, appearance quality, physical properties and inspection rules of various brands of granite required are strictly implemented in accordance with the relevant provisions of the industry standard JC205-92.

Mineral pigment: color coordinated with the decorative panel (combined with white cement for wiping joints)

Sand: medium to coarse sand, with a mud content of less than 3%, and is removed through sieving The markings of sundries and stone line mortar shall be according to the design requirements, and the test blocks shall be delivered according to the specifications.

Cement: Ordinary Portland cement or slag Portland cement of grade 32.5 and above.

Stone panels: Specifications, varieties, colors, and patterns are subject to design regulations (natural stone panels).

2) Construction preparation

1. Remove the mortar, dirt and other garbage on the structural floor, water it to moisten it, and brush it once with plain cement slurry with a water-cement ratio of 0.5. Do not If there is any leakage, any loose parts should be cleaned up and reinforced.

2. According to the height of the standard bar, pave 1:2.5 dry hard cement mortar, scrape it flat with a short scraper, tap it flat with an iron trowel, and then use a long scraper to check the surface smoothness vertically and horizontally.

3. Trial paving according to the stone markings provided by the stone supplier. Use suction cups for trial paving. After trial paving, loosen the cement mortar, sprinkle a little water and pour a layer of pure cement slurry (1:1--- 1:1.5), let it penetrate before laying. The four corners of the laying board should be dropped evenly at the same time, and the seams should be aligned and laid flat. Use a rubber hammer to hit them flat. If hollows, unevenness or uneven joints are found, the board should be re-installed. Set off resurfacing. After the model room is inspected and approved by the owner and supervisor, large-scale construction will begin based on this model.

4. In the laying sequence, first lay the four boards at the intersection as the control board. This board is the horizontal standard of the entire floor and the standard of vertical and horizontal joints. Pay attention to correcting it with a level ruler and full-length steel wire, and then Lay them sequentially to both sides and in the backward direction, and use a level and ruler at any time to keep track.

3) Construction methods

1. Brush the back of the stone slab clean first and keep it moist when paving it.

2. According to the horizontal line and center line (cross line), lay out each part according to the pre-arranged number, and then perform wire laying.

3. Spread dry hard cement mortar (generally the mix ratio is 1:2.5), which should be moist and loose, and hold into a ball without bleeding. The thickness of the leveling layer should be 25-30mm. Place it on The height of the stone slab should be about 3-4mm on the finished surface. Use an iron trowel to flatten it, and then pre-pave the stone slab. The vertical and horizontal seams should be aligned, and the middle of the slab should be struck with a wooden hammer, and the mortar should be vibrated to the laying height. , lift up the slate, check that the mortar surface matches the slate (if there is any void, fill it with mortar), first use a watering can to sprinkle an appropriate amount of water on the mortar surface, sprinkle a layer of cement powder evenly, align the slate pieces, and pave. At this time, the four corners should land at the same time, and then use a wooden hammer to tap hard until it is flat.

4. The order of paving should be from the inside to the outside.

5. 24 hours after the paving is completed, after checking that there are no breaks or hollows on the surface of the stone slabs, fill the seams with dilute cement and wipe them with a dry cloth at any time until there is no residual dust or dirt. , pedestrians and stacking of items are prohibited within two days after the stone slabs are laid.

4) Quality standards

Guarantee items

1. The variety and quality of the plates used in the surface layer must meet the design requirements.

2. The connection between the surface layer and the base layer must be firm without hollowing.

Inspection method: tap with a small hammer and observe and inspect.

Basic Items

The surface quality of the plate surface meets the following requirements:

Qualified: The color is uniform, and the plate has no defects such as cracks, corners, or chips.

Excellent: The surface is clean, the pattern is clear, the color is consistent, the seams are even, the same edge is straight, the board has no cracks, no corners, no defects, etc.

5) Construction precautions

Avoid common project quality problems

1. Holes between the stone slabs and the base layer: Mainly due to the base layer not being cleaned cleanly and not having enough moisture Wet, the mortar of the binding layer is too thin (the mortar should not be less than 25-30mm if it is empty, and the thickness should not be less than 20mm after the block material is solid), the mortar of the binding layer is not full, and the water-cement ratio is too large, etc.

2. There are large and small gaps on the edges: due to the unevenness of the board itself, improper operation during paving, pedestrians trampling on the board too early after paving (sometimes loosening of the board, etc.), generally two days after paving. The Queen of Heaven strictly prohibits pedestrians from trampling on it.

Main safety measures

(1) When loading and unloading stone slabs, handle them with care to avoid squeezing your hands or hitting your feet.

(2) When using a portable motor, it must pass the trial operation, and the leakage switch and reliable grounding device must be taken into account. The operator must wear protective glasses and insulating gloves.

Product Protection

(1) The granite slabs provided by the supplier must be packed in wooden boxes, firmly packed, with the smooth surfaces facing each other and lined with soft paper. The project areas are packaged separately and marked with "handle with care" and "up" signs. Rolling or collision is strictly prohibited during transportation, loading and unloading.

(2) Stone slabs should be stored away from rain and long-term sunlight. They should generally be placed vertically, with the smooth surfaces facing each other, and the bottom of the slab should be supported by square wood; they should be handled with care during transportation.

(3) Operators who test, adjust and clean seams must wear soft-soled shoes.

(4) On the completed ground, pedestrians are prohibited from walking or stacking objects within two days, and the surface must be covered with protective materials (such as sawdust, straw curtains, plastic woven cloth, linoleum, etc.).

(5) After the completion of the ground, when the strength of the cement mortar bonding layer reaches 60-70%, local grinding is allowed.

(6) When transporting materials, do not damage the column surface. During construction, various pipelines and embedded parts must not be damaged by collision. If there is contamination during construction, it should be cleaned up in time.

Beijing Yihai Jiahua Technology Development Co., Ltd.