Ask for 2 cast in situ reinforced concrete inspection well construction plans!!

1. The strength grade of structural concrete must meet the design requirements. Specimens used to check the concrete strength of structural components should be randomly selected at the place where the concrete is poured. Sampling and specimen retention shall comply with the following provisions:

1) For every 100 trays of concrete with the same mix ratio of no more than 100m3, sampling shall not be less than once;

2) When the concrete of the same mix ratio is less than 100 trays mixed in each working shift, sampling shall not be less than once;

3) When a continuous pouring exceeds 1000m3, the concrete of the same mix ratio is sampled not less than once every 200m3;

4) For each floor and the concrete of the same mixture, sampling shall not be less than once;

5) At least one group of standard curing specimens should be retained for each sampling, and the number of retention groups for curing specimens under the same conditions should be determined according to actual needs.

Inspection method: check the construction record and the test report of the strength of the specimen.

2. For concrete structures with impermeability requirements, the concrete specimens should be randomly sampled at the pouring site. For the same project and the same mix ratio of concrete, sampling should not be less than once, and the number of retention groups can be determined according to actual needs.

Test method: check the impermeability test report of the specimen.

2) General items.

1. The retention position of the post-pouring belt should be determined according to the design requirements and the construction technical plan. The concrete pouring of the post-pouring belt should be carried out according to the construction technical plan. The supervising engineer shall inspect all of them.

Inspection method: Observe and check the construction records.

2. After the concrete is poured, effective maintenance measures should be taken in a timely manner according to the construction technical plan, and the following provisions should be met:

1) The concrete should be covered and moisturized within 12h after pouring;

2) Concrete watering and curing time: for the concrete mixed with Portland cement, ordinary Portland cement or slag Portland cement, it shall not be less than 7d, and for the concrete mixed with retarder type admixture or impermeability requirements, it shall not be less than 14d;

3) The number of watering should be able to keep the concrete in a wet state; The water used for concrete curing should be the same as that used for mixing;

4) The concrete covered with plastic sheeting should be covered tightly, and the condensate should be kept in the plastic sheeting;

5) before the concrete strength is reached, shall not step on it or install formwork and support. Remarks:

1. When the average temperature of the day is lower than 5, no watering is allowed;

2. When the concrete surface is inconvenient to water or use plastic sheets, it is advisable to apply curing agent;

3. For the maintenance of large-area concrete, temperature control measures should be taken according to the climatic conditions according to the construction technical plan.

Number of inspections: All inspections.

Inspection method: Observation, check the construction record.

Table of allowable errors in rebar machining.

1) The formwork adopts light composite steel formwork, which is ordered by the manufacturer. When the commercial concrete is vibrating, the formwork joint must meet the requirements of no slurry leakage, and a sponge strip is added at the joints of the formwork, and the sponge strip is flush with the inner surface of the formwork. 48 steel pipe fasteners are used for fastening, and the reinforced commercial concrete well wall is supported by tension bolts and steel pipe fasteners.

2) Measure the lofting according to the true shape and size of the permanent project shown in the drawings. The formwork should be installed in the correct position, the support is stable, there are enough pillars, struts and tie bars, and it can withstand the lateral pressure generated when the commercial concrete is poured and vibrate, and is not affected by the climate. When erecting the formwork, the formwork should be arranged evenly and straightly, so that the surface of the commercial concrete at the joint is smooth and uniform.

The seam design of the formwork should be in harmony with the appearance of the structure, so that the vertical and flat seams are kept straight. The formwork shall not be directly connected with the structural reinforcement, nor shall it be connected with the construction scaffolding, so as not to cause deformation and dislocation of the formwork.

3) The inner surface of the formwork is coated with a release agent to prevent adhesion with commercial concrete and facilitate mold removal. The adjacent commercial concrete or reinforced structures must not be contaminated during the coating operation. Before pouring the commercial concrete, remove sawdust, shavings, dust, other chores and stagnant water on the forming surface of the formwork.

4) Fix the embedded parts or reserved pipes on the template according to the position and elevation required by the drawing. Before pouring commercial concrete, determine the position and quantity of embedded parts and reserved holes consistent with the design drawing, and install firmly.

5) The strength of commercial concrete when the formwork is dismantled shall meet the relevant requirements of the design code. The structure of the formwork and support that has been dismantled can bear all the use load only after the strength of the commercial concrete reaches the strength level of the designed commercial concrete.

1. The concrete inspection well involves the construction specifications of each sub-item, and there is no special or special acceptance specification;

Code for Engineering Surveying (GBJ50026).

Code for Construction Quality Acceptance of Concrete Structure Engineering" (GB50204), "Code for Construction and Quality Acceptance of Urban Road Engineering" (CJJ1), "Code for Construction and Acceptance of Water Supply and Drainage Structures" (GB50141), "Standard for Inspection and Evaluation of Concrete Strength" (GB50107), "Atlas of Drainage Inspection Wells" (02S515).

2. Reference Atlas of Specific PracticesNational Building Standard Design Atlas (05SS521);

3. Cast-in-situ reinforced concrete inspection well construction technology standard, version: 1st edition file number: JGSZ-JS04-007.

Inspection wells are used in the construction area (residential areas, public building areas, factories, etc.) within the scope of the buried plastic drainage pipe outer diameter is not more than 800mm, buried depth is not more than 6m, generally located at the drainage pipe intersection, turn, pipe diameter or slope change, water fall, etc., in order to facilitate regular inspection, cleaning and dredging or down the well operation inspection with plastic integrated injection molding or brick well-shaped structure.

The inspection well is composed of a well seat, a wellbore, a manhole cover and related accessories, etc., and is used to clear and inspect the well-shaped structure.

The types are: A, B, C, D, and E.

A, B, C, D, and E inspection wells are mainly distinguished by depth: 6m in the inspection wells: 6m in the inspection wells: A type well, B type well, C type well, D type well, and E type well.

Type A inspection well: suitable for pipe inner diameter d=200 500mm, h 1400mm, h is the distance between the ground and the bottom of the large pipe.

Type B inspection well: suitable for pipe inner diameter d=200 500mm, 1400mm h 6000mm; The inner diameter of the tube is d=600mm, and the h6000mm.

Type C inspection well: suitable for pipe inner diameter d=700 800mm, h 6000mm.

D-type inspection well: suitable for pipe inner diameter d=900 1500mm, h 8000mm.

There are two types of plane shapes: round and square.

Size, depth, nothing? Geological report: reinforcement, reinforcement, etc.

1. Basic method: the bottom of the well should be tamped, the compactness should be more than 95%, and 10 cm gravel or C15 cushion should be laid.

2. Wellbore connection method: tongue and groove type, 1:2 waterproof mortar seat slurry.

3. The connection between the inspection well and the pipeline: different pipes are treated separately, and the cement pipe should be chiseled. Treated with 1:2 expansion mortar. Other pipes are treated according to the requirements of the pipes.

In the construction of concrete inspection wells, there are still many places that need to be paid attention to, and we should pay more attention to them in the installation process!