Construction scheme of dike revetment masonry project?

The construction scheme of dike revetment masonry project is very important, and no detail of the project construction can be sloppy. Only by following the plan can we do our best and achieve the expected results. Zhong Da Consulting will explain the construction scheme of dike revetment masonry project for you.

Work content of 1

This bid section consists of concrete precast block slope protection, gravel coarse sand cushion, mortar masonry capping, mortar masonry drainage ditch, mortar masonry footwell, dry block stone of low-water platform, slope protection stone and diversion ditch. The slope protection thickness is 25cm, including the thickness of concrete precast block slope protection 10cm, gravel cushion thickness 10cm and coarse sand cushion thickness of 5 cm; The top of slope protection is capped with mortar masonry, and the beach top is provided with longitudinal mortar masonry drainage ditch; The slope is provided with a diversion and filtration ditch; The toe of the slope is provided with mortar masonry foot groove and dry block Shi Gan platform, and riprap is connected with the slope stone.

Main quantities of masonry engineering: coarse sand cushion: 12079, crushed stone cushion: 26226, C20 precast concrete slope protection: 18924, slope stone: 24972, mortar masonry: 12923, dry block stone:16844.

Stone and crushed stone used in masonry construction are all from Oushan Yard and Huangnishan Yard, close to the automobile transportation operation surface or material preparation yard. Sand is mainly purchased from Bahe River in Hubei and Qiupu River in Guichi and transported to the construction area. Manually carried (picked) to the yard and the construction site for classification and stacking. Building cement is purchased locally from Conch brand cement and transported to the building warehouse.

2 Construction sequence

Masonry engineering has six working areas, from slope toe construction to slope top. The length of each working area is about 890m, and each working area is regarded as a zone. In the area, foundation cleaning → laying diversion and filtration ditch → toe trench masonry → low-water platform → connecting slope stones → laying coarse gravel cushion on slope surface → laying concrete precast blocks (toe trench in the next area will be constructed at the same time, and each construction operation surface will rise alternately) → masonry mortar masonry capping → masonry mortar masonry longitudinal drainage ditch → concrete prefabrication. Slope protection mortar masonry drainage ditch should be firmly connected with capped mortar masonry, and the transition is smooth and beautiful.

From mid-June, 65438+20 * * to the end of early February, 20XX, when the water level of the river is low, the footpits, low-level platforms, slope stones and some concrete precast blocks near the toe of the slope were suddenly completed to ensure that the project construction is not affected by the rising water level of the Yangtze River. See process flow chart 4-4 for the process flow of water slope protection construction.

3 preparatory work

(1) Improve the construction survey control network;

(2) Check the section size, elevation, compactness, etc. After slope cutting and foundation cleaning, masonry construction can be carried out only if it meets the design requirements;

(3) The footwell, low-water platform, diversion filter ditch, etc. shall be set out and measured.

(4) Conduct mortar test and submit the proposed mixture ratio to the supervision engineer for review;

Figure 4-4 Process Flow Diagram of Water Slope Protection Project

(5) Purchase selected construction materials such as sand, stone and cement, and conduct necessary tests and tests.

4 Construction method

(1) Construction of diversion and filtration ditch: The layout position of diversion and filtration ditch shall be determined by the design representative on site according to the water content of slope soil and water seepage escape, and its spacing and structural type shall be implemented according to the construction details. Earthwork shall be excavated manually, transported to the temporary slag collection yard, and the next working procedure shall be constructed after acceptance by the on-site supervision engineer; Backfill macadam, melon rice stone and coarse sand shall be transported, paved and leveled manually.

(2) Footpit construction: After lofting, measuring and positioning, manual excavation will be adopted first, 1m3 excavator will be used for digging, 5t dump truck will transport the footpit earthwork to the spoil ground, and the footpit will be built manually after it is accepted by the site supervision engineer.

(3) Construction of coarse sand cushion or gravel cushion:

1) control lofting;

2) dividing the construction area;

3) Repair and protection of base surface (temporary drainage ditch shall be added to prevent rain from washing away);

4) After the foundation surface is accepted by the supervision engineer, the coarse sand or gravel will be transported to the working face manually, and it will be paved, leveled and compacted manually; The paving and filling of cushion will rise in stages with the increase of masonry surface.

(4) concrete precast block slope protection construction

1) The dimensions and performance indexes of precast concrete blocks for slope protection shall conform to the provisions of the detailed construction drawings or technical requirements.

2) Re-survey and determine the outline size of the masonry plane;

3) Divide the construction area into 3 ~ 5m vertical partitions and 5m horizontal partitions from the toe of the slope, erect sample piles at the four corners of each partition, and hang lines along the slope direction on the sample piles according to the requirements of the designed slope line;

4) Hang a horizontal line on the laying sample line, and then build concrete precast blocks in this area-manually transport the precast blocks to the working face and build them manually;

5) Precast concrete blocks must be laid in bottom-up order, and the masonry should be smooth and dense, and the gaps between precast blocks should be sealed with mortar;

6) Review and arrangement are completed.

(5) mortar masonry construction:

1) Check whether the dimension and elevation of excavation section of foundation surface meet the design requirements, and report it to the site supervision engineer for acceptance;

2) Masonry mortar shall be mixed with 0.25m3 mobile mixer, and the mortar strength grade shall be M 10, and the mixture ratio approved by the supervision engineer shall be strictly followed. Each working face is equipped with a mixer, which is arranged on the beach top near the nearby working area, and the required sand and cement are directly transported in place.

3) Masonry mortar shall be transported to the operation surface by manual transportation or hopper transportation, stone shall be transported to the operation surface by manual transportation, and mortar shall be laid manually. 4) Review and arrangement are completed.

(6) Dry code block stone construction

1) Check whether the size and elevation of the foundation surface of the low-flow platform meet the design requirements;

2) Clean and level the base surface of the platform.

3) Manually dry the stone to the designed thickness of 50cm, and carry it to the working face manually.

4) Add riprap to connect the slope stones, so that the dry block stones on the low-water platform can be connected with riprap smoothly.

5 Selection requirements of building materials

(1) stone

1) The stone used for masonry shall be hard, not easy to be weathered and free from cracks. Its water resistance, frost resistance, compressive strength, etc. Should comply with the detailed construction drawings or related technical requirements. Stone used for masonry surfaces must have a flat surface for masonry surfaces. Trim it slightly when the size is large. Its performance indicators should meet the requirements and regulations of relevant specifications.

2) The shape of the block stone should be roughly square, and the upper and lower surfaces should be roughly flat; The thickness is about 20 cm ~ 30 cm, the width is about 1.0 ~ 1.5 times and the length is about 1.5 ~ 3.0 times. If there is a sharp edge, it must be knocked off; Don't use a stone with a thick side and a thin side.

(2) Cement: Conch brand 32.5 ordinary portland cement is selected. 1) Cement shall have product certificate and ex-factory test sheet when entering the site; Check and accept the variety, label, package, quantity and factory date of cement.

2) All cement entering the site shall be inspected before use to confirm that it meets the requirements.

3) Cement with different grades, brands, varieties and production dates should be stacked separately, and it is forbidden to mix them. 4) Cement that has left the factory for more than three months or is affected with damp must be inspected and meet the requirements before it can be used. 5) It is forbidden to use caked and deteriorated cement.

(3) Sand: natural river sand with hard texture, clean particles and good grading is selected; The grain shape should be square, and there should be no active aggregate; The water content should be balanced and less than 7%; The fineness modulus should be 2.4 ~ 2.8.

(4) Gravel: The selected gravel should be hard, clean, with good particle shape and gradation.

(5) Water: The water used for mortar mixing must be fresh, clean and pollution-free, and drinking water should be selected. If there is no drinking water, the extracted river water can be purified and used as construction water.

6. Technical requirements for construction quality

(1) Footpit, drainage ditch, masonry capping, diversion and filtration ditch, etc. Should meet the design section size requirements;

(2) The selected masonry materials such as stone, gravel, sand and cement must meet the requirements of the tender documents;

(3) Construction methods and procedures must meet the requirements of construction specifications; The paved cushion material should be paved in time for the upper slope protection, and personnel and vehicles are prohibited from passing.

(4) The slope surface is protected by hexagonal concrete precast blocks with a thickness of 10㎝ and a side length of 30㎝, with coarse sand with a thickness of 5㎝ and gravel with a thickness of 10㎝ below. The precast blocks are spliced, with 1 precast every 4m.

(5) The mixture ratio and strength of mortar shall meet the design requirements in addition to the requirements of masonry construction. When laying, the gap shall be filled with pebbles, and mortar shall not be used; Surface deviation is not more than 30mm2m; The width of build by laying bricks or stones joint is flat joint 15 ~ 20mm, and the vertical joint is 20 ~ 30mm.

7 Construction quality control

(1) Do well in survey control, lofting and marking;

(2) Strictly follow the approved construction measure plan, operate by the chapter, conduct civilized construction, strengthen quality and technical management, and record, sort out and summarize the original data;

(3) Strict process management, and the next process can only be carried out after the last process is accepted by the supervision engineer;

(4) Slope protection construction of precast concrete blocks: strictly control the quality of precast concrete blocks; When laying, the completed cushion shall not be damaged; Masonry should be carried out from bottom to top. Masonry should be tight, and the gaps between precast blocks should be sealed with mortar. The bottom pad should be filled and not overhead. In the process of laying, neutral sample piles should be hung vertically and horizontally, and the flatness should be tested frequently to prevent unevenness. The cushion under the hole should be laid in layers in strict accordance with the requirements. And report to the supervisor for approval before implementation.

(5) Mortar masonry construction: 1) Mortar shall be used in strict accordance with the approved mixture ratio, and the mixing amount shall be controlled to be used up within 3h after mixing.

2) Masonry by mortar method. When laying, mortar should be laid first, then stones should be laid, masonry should be done in layers, staggered joints should be made up and down, and internal and external joints should be overlapped to ensure stable masonry. The masonry height difference between adjacent working sections shall not be greater than 1.2m, and each floor shall be roughly leveled, and the subsection position shall be located at settlement joint or expansion joint as far as possible.

3) Before laying, the stone should be wetted with water to make its surface fully absorb water, but there should be no residual water. The thickness of mortar joint is generally 20 ~ 35mm, and larger cracks should be filled with gravel, but pebbles higher than mortar layer should not be used to pave the ground at the grass-roots level or under stones.

4) The first layer of stones of masonry foundation should face downwards. The first layer of masonry and its corners, intersections, caves, orifices, etc. It should be made of large flat stones.

5) All masonry stones are placed on the freshly mixed mortar, and the mortar joint must be full and dense, and the stone joint shall not be directly adjacent. It is not allowed to build stones by standing stones outside and filling the heart in the middle.

6) The structural size and position of masonry shall meet the requirements of design and relevant specifications. Build by laying bricks or stones seam requirements do mortar, exposed surface smooth and beautiful, build by laying bricks or stones seam exposed surface should be reserved about 4cm deep gap, in order to tick off seam processing; Arm should be natural, symmetrical and beautiful, with prominent stone shape and smooth surface. The mortar splashed on the exposed surface of masonry should be removed, and the interface between mortar masonry and dry masonry should be straight and tight to ensure the beauty of masonry.

7) When the temperature is between 0℃ and 5℃, the masonry shall be well protected against freezing and heat preservation to prevent the surface from freezing, and the warehousing temperature of mortar shall be controlled at not less than 5℃; When the temperature is lower than 0℃, the construction shall be stopped; In rainy days, the water-cement ratio of mortar should be reduced appropriately, and the accumulated water in the working area should be eliminated in time.

(8) After masonry is laid, special personnel will be arranged for maintenance within 12 ~ 18h to keep the appearance of mortar masonry moist; The curing time depends on the temperature and is generally 14d.

8 construction strength analysis

(1) The quantities of the coarse sand gravel cushion on the slope are 10069, 19254, 20xx65438+1October 22nd to 20xx April17th, * * is 86d, and the effective working time is 66 days. It takes ***32d to backfill the coarse sand and gravel in the guide filter ditch, and the effective working time is 24 days, with an average of 1.42m3 per person per day and labor 108 person per day.

(2) Six pieces of slope protection are prefabricated, with the engineering quantity of 18924, 20XX years of 65438+20XX1from October 24th to April 20th of 20xx, * * * days of 87d, and the effective working time of 65d, with an average of 0.78 buildings per person per day.

(3) Mortar masonry project: the amount of mortar masonry work in footwell is 6568, 20XX 65438+20XX year1from October 6th to February 8th * * 34d, and the effective working time is 26d, with an average of 0.5 1 per person per day, which requires 495 labor/day; The quantity of masonry with capped mortar is 1983, 20XX March 25th to 20xx April 18, * * 25d, the effective working time is 18d, and the masonry is 0.5 1 per person per day, which requires 2 16 people per day. There are 4372 mortar masonry buildings in the drainage ditch, with a masonry capacity of 0.5 1 per person per day. The effective working day is 15d, and the required labor force is 57 1 person.

(4) * * Dry code block stone and slope stone works 4 18 18, 20XX 65438+ 10/0 ~ 20xx2 17, * * 49d, with effective working hours of 37d.

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