1 work content
This section of the project consists of precast concrete block berm, gravel coarse sand bedding, slurry masonry capping, slurry masonry masonry drainage ditch, slurry masonry footing groove, dry water platform dry code block stone, catch slope stone and guide filter ditch and other parts. The thickness of the slope protection is 25cm, of which the precast concrete block slope protection is 10cm thick, the gravel bedding is 10cm thick, and the coarse sand bedding is 5cm thick; the top of the slope protection is set up with slurry masonry capping, and the top of the beach is set up with longitudinal slurry masonry drainage ditch; the surface of the slope is set up with guide filtration ditch; the foot of the slope is set up with slurry masonry footing groove and dry-yard block stone withered-water platform, and the outside of the slope catching stone connects to the thrown stone.
Masonry construction of the main amount of work: coarse sand bedding: 12079, gravel bedding 26226, C20 precast concrete block slope 18924, 24972 catch slope stone, slurry masonry 12923, dry code blocks 16846.
Masonry construction of block stone, gravel are used from the root of the hill material field and yellow mud mountain material field, the steam delivery of the work surface near the site or preparation of the yard, the sand is mainly from the Bahe Bahe, Guichi autumn in Hubei, and the sand is mainly from the root of the hill material field. Purchase water from Hubei Ba River and Guiqi Qiupu River to transport to the construction area. Sand is mainly purchased from Bahe River in Hubei and Qiupu River in Guichi and transported to the construction area by water. Cement for construction is purchased from the local Conch brand cement and transported to the construction warehouse by steam.
2 construction sequence
Masonry project set up six work areas respectively from the foot of the slope to the top of the slope construction. Each work area is about 890m long, each work area according to the slope between the two transverse drainage ditches as a compartment, compartment according to the clearing base → laying filter guide ditch → foot of the slope foot groove masonry → wither platform → catching the slope stone → laying slope surface coarse sand gravel bedding → masonry precast concrete blocks (at the same time for the next compartment in the foot groove and other construction, the construction of the construction surface of the alternating rise) → masonry slurry masonry roof → masonry top surface of the longitudinal masonry vertical drainage ditch → masonry top surface slurry masonry block retaining and precast concrete block with a slurry drainage channel → the top surface of the slope, and the top surface of the masonry masonry vertical drainage channel. Masonry of precast concrete block berm connecting with slurry masonry capping section. Slope masonry drainage ditch should be firmly connected with the top masonry, smooth transition, beautiful.
In mid-December 20** to early February 20XX when the water level of the river at the end of the lower, surprise to complete the foot groove near the foot of the slope, withered water platform, catching the slope stone and part of the precast concrete block berms, in order to ensure that the construction of the project is not affected by the Yangtze River water level rise. The process of water slope protection construction is shown in Process Flow Diagram 4-4.
3 Preparation work
(1) Improve the construction measurement and control network;
(2) Check the cross-section size, elevation, compaction, etc., after cutting the slope and clearing the foundation, and conform to the design requirements before proceeding with the masonry construction;
(3) Carry out the sample measurement of footing grooves, withered-water platforms, and guided filtration ditches;
(4) Check the masonry construction after cutting the slope and clearing the foundation, and conform to the design requirements;
(5) Carry out the sample measurement of footing grooves, withered-water platforms and guided filtration ditches; and
(4) Conduct mortar test and propose the proposed mix ratio to the supervising engineer for review;
Figure 4-4 Process flow diagram of water slope protection project
(5) Purchase selected construction materials such as sand, stone, cement, etc., and carry out the necessary tests and inspections.
4 Construction Methods
(1)Construction of Filter Guide Ditch: The location of filter guide ditch is determined on the spot by the design representative according to the water content of the soil material on the slope and the seepage water out of the escaping, etc. The spacing and structural type are executed according to the construction detail drawing. The earth is excavated manually, picked and transported to the temporary slag collection site, and after acceptance by the on-site supervisory engineer, the construction of the next process will be carried out; the backfill gravel, guamei stone and coarse sand are picked and transported manually, paved and leveled.
(2) footing construction: after the sample measurement and positioning, the first manual excavation, 1m3 excavator digging, 5t dump trucks to transport footing earth to the abandonment site, after the acceptance of the site supervision engineer, and then artificial masonry slurry masonry footing.
(3) coarse sand bedding or gravel bedding construction:
1) control of sampling;
2) division of the construction area;
3) the base surface repair, protection (additional temporary drainage ditches, to prevent rainfall scouring);
4) the base surface by the acceptance of the supervisory engineer, manually picking the transport of coarse sand or gravel to the working surface, manual paving, leveling, patting; The bedding paving rises in sections with the height of the masonry surface.
(4) precast concrete block slope construction
1) precast concrete blocks used for slope protection size, performance indicators should be in line with the provisions of the construction details or technical requirements.
2) review, determine the masonry plane contour size;
3) the construction area from the foot of the slope is divided into longitudinal 3 ~ 5m, horizontal 5m or so of the compartment, each compartment of the corners of the sample stakes, and according to the design of the slope line requirements in the sample stakes on the slope down the line;
4) masonry on the sample line hanging horizontal line, and then carry out the compartment of precast concrete masonry block - artificial Lift the precast blocks to the working surface and masonry by hand;
5) The precast concrete blocks must be masoned in the order from the bottom to the top, and the masonry should be leveled, occluded tightly, and the gaps between the precast blocks should be sealed with mortar;
6) Reviewing and trimming is completed.
(5) slurry masonry construction:
1) check whether the size and elevation of base excavation section are in accordance with the design requirements, and report it for acceptance by on-site supervising engineers;
2) the masonry mortar is mixed by 0.25m3 mobile mixer, and the strength grade of the mortar is M10, and it is strictly executed in accordance with the mixing ratio approved by supervising engineers. One mixer is set up for each working face, which is nearby on the top of the beach near the working area, and the required sand and cement are directly transferred into place.
3) Mortar for masonry is picked and transported manually or transported to the working face by bucket trucks, and stone is lifted to the working face by hand, and mortar and masonry are spread manually.4) Review and repair are completed.
(6) dry code block stone construction
1) check whether the size and elevation of the base surface of the dry water platform meet the design requirements;
2) clean up and level the base surface of the platform.
3) Artificially dry yard block stone to reach the design thickness of 50cm, the stone is lifted to the working surface by hand.
4) Add throwing slope stone, so that the withered water platform dry yard block stone and throwing stone connection smooth.
5 construction materials selection requirements
(1) block stone material
1) masonry block stone material should be hard, not easy to weather, no cracks. Its water resistance, frost resistance, compressive strength, etc. should be consistent with the provisions of the construction details or relevant technical requirements. Stone used for masonry surface must have a flat surface for masonry surface, when the size is larger, should be slightly trimmed. Its performance index should be in line with the requirements and provisions of the relevant specifications.
2) the shape of the block should be roughly square, roughly flat above and below; thickness of about 20cm ~ 30cm, the width of about 1.0 ~ 1.5 times the thickness, the length of about 1.5 ~ 3.0 times the thickness; such as sharp edges and sharp corners, should be knocked out; shall not be used on one side of the thick side of the thin block.
(2) Cement: Conch brand 32.5 ordinary silicate cement. 1) Cement into the field, there should be a certificate of conformity and factory laboratory; should be the variety of cement, standard, packaging, quantity, date of delivery, etc. Check and acceptance.
2) All incoming cement should be tested to confirm that it meets the requirements before use.
3) Cement of different grades, brands, varieties and factory dates should be stacked separately, and mixing is strictly prohibited.4) Cement with a factory date of more than three months or damp must be tested to confirm that it meets the requirements before use.5) It is strictly prohibited to use cement which has been agglomerated and deteriorated.
(3) sand: use hard texture, clean particles, good grading of natural river sand; particle shape should be square and rounded, there should be no active aggregate; water content should be balanced and less than 7%; fineness modulus should be within the range of 2.4 ~ 2.8.
(4) crushed stone: the selected crushed stone should be hard, clean, good grain shape and grading.
(5) water: mortar mixing water must be fresh, clean, non-polluting, it is appropriate to use potable water. If there is no drinking water, can be used to extract the river water after purification treatment as construction water.
6 construction quality and technical requirements
(1) footing grooves, drainage ditches, slurry masonry capping, guided filtration ditch, etc. should be in line with the design of the cross-section size requirements;
(2) selection of masonry stone, gravel, sand, and cement and other materials must be in line with the requirements of the bidding documents;
(3) the construction methods and procedures must be in line with the requirements of the construction specifications; has been paved with bedding materials, should be carried out in a timely manner for the upper layer of berm paved material. The upper layer of slope paving construction should be carried out in time, and the passage of people and vehicles is strictly prohibited.
(4) The slope is protected by hexagonal precast concrete blocks with 10cm thickness and 30cm side length, under which there is 5cm thickness of coarse sand and 10cm thickness of crushed stone, and there is jointing between precast blocks, and there is one precast board with center hole every 4m, and the diameter of the hole is 5cm;
(5) In addition to masonry construction, the mortar ratio and strength should be in accordance with the design requirements. Masonry voids filled with small stones shall not be filled with mortar; surface deviation in the range of 2m is not more than 30mm; masonry joints width of flat joints 15 ~ 20mm, vertical gaps of 20 ~ 30mm.
7 construction quality control
(1) carefully do a good job of measurement and control, sampling, marking work;
(2) strictly in accordance with the reported and approved plan of construction measures, in accordance with chapter operation, civilized construction, strengthen the quality and technical management, do a good job of recording and organizing the original information and project summary work;
(3) strict process management, the previous process by the supervising engineer acceptance before the next process of construction;
(4) precast concrete block berm construction: strict control of the quality of the precast concrete blocks; masonry shall not destroy the completed bedding layer; should be Bottom-up masonry, masonry should be close and seal the gap between the precast blocks with mortar, the bottom of the pad is stable and fill, no hollow. Neutral sample pile in masonry process, longitudinal and transverse are hanging line construction, and often carry out flatness test to prevent the phenomenon of unevenness. The bedding under the hole should be paved in layers strictly according to the requirements. And report to the supervisor for approval after implementation.
(5) slurry masonry construction: 1) mortar is strictly in accordance with the approved ratio, and mixed with the use of each mixing control in the mixing of the amount of 3h after use.
2) the use of laying mortar masonry. Masonry should be laid first mortar after masonry, stone should be layered lying masonry, upper and lower staggered joints, inside and outside the lap, masonry stabilization. Adjacent work section of the masonry height difference should not be greater than 1.2m, each layer should be generally leveling, segmental location should be located in the settlement joints or expansion joints as far as possible.
3) Before masonry, the stone should be sprinkled with water and wet, so that its surface is fully absorbent, but there shall be no residual water. The thickness of the mortar joints is generally 20 ~ 35mm, the larger gaps should be filled with gravel, but shall not be on the base or the stone below the mortar layer with a higher than the small stone support.
4) the first layer of masonry foundation stone should be the large face down. Larger leveled blocks should be used for the first layer of masonry and its corners, intersections with caves and orifices.
5) All masonry stones are placed on freshly mixed mortar, the mortar joints must be full and dense, the stone joints shall not be directly adjacent to each other, and it is not permitted to use the method of masonry of outside side standing stones and center filling.
6) the structural size and location of the masonry, should be in line with the design and relevant specifications. The masonry joints are required to be full of mortar, the exposed surface is smooth and beautiful, the masonry joints on the exposed surface should be reserved about 4cm deep gap for hooking treatment; hooking should be natural, well-proportioned and beautiful, the form of the blocks is prominent, the surface is smooth. The mortar spattered on the exposed surface of the masonry should be cleaned up, and the interface between the slurry masonry and the dry masonry should be straight and close to ensure that the masonry appearance is beautiful.
7) When the temperature is 0℃～5℃, the masonry should be well protected from freezing and warmth to prevent the surface from freezing, and at the same time, the temperature of the mortar should be controlled to be not less than 5℃; when the temperature is lower than 0℃, the construction should be stopped; the construction in rainy days should be appropriately reduce the mortar water-cement ratio and exclude the working area from the water in a timely manner.
(8) arrange special person and class to carry out maintenance within 12~18h after masonry, keep the exposed surface of slurry masonry masonry wet; maintenance time depends on the temperature, generally 14d.
8 construction intensity analysis
(1) slope coarse sand gravel bedding volume of 10069, 19254, respectively, on January 22, 20XX to April 17, 20XX, *** counted 86d, effective working time of 64d, an average of 1.42 per person per day paving and filling, the labor required is: 323 people / day; guide filter ditch coarse sand gravel backfill, *** 32d, effective working time of 24 days, an average of 1.42m3 per person per day of integrated backfill, the labor required 108 people / day.
(2) slope prefabricated hexagonal block slope protection, project volume 18924, January 24, 20XX ~ April 20, 20XX, *** counted 87d, the effective working time of 65d, an average of each person per day masonry (lifting) 0.78, an average of 373 people / day construction operations.
(3) slurry masonry project: foot slot slurry masonry project volume 6568, January 6, 20XX ~ February 8, 20XX, *** 34d, effective working time 26d, average daily per person masonry 0.51, need labor 495 people / day; capping slurry masonry project volume 1983, March 25, 20XX ~ April 18, 20XX, *** 25d, effective working time 18d, average daily per person masonry (lifting) 0.78, average need labor / day construction work. Effective working time 18d, each person per day masonry 0.51, need labor 216 people / day. Drainage ditch slurry masonry 4372, each person masonry 0.51 per day, the effective working time of 15d, requiring labor 571 people.
(4) dry code block stone and catch slope stone *** counting the volume of 41,818, January 10, 20XX ~ February 17, 20XX, *** 49d, the effective working time of 37d, each person lifting the code of 2 per day, requiring labor 565 people / day.
"River embankment protection masonry construction program" detailed information in the Zhongda Consulting construction pass, want to have all the relevant building construction information.
For more information on engineering/service/procurement bid writing and production, to improve the bidding rate, you can click on the bottom of the official website customer service free consultation:/#/?source=bdzd