Construction Section of Sintering Brick Tunnel Kiln Track Foundation

Construction procedure of sintered brick tunnel kiln track foundation: earthwork excavation-foundation treatment-foundation plain concrete-reinforced concrete foundation-earthwork backfill-reinforced concrete foundation-track beam

Track foundation: it is required that the geological conditions are balanced, the ground endurance is ≥ 180KPa, the base layer is compacted with plain soil, the lower layer is concrete cushion, and the upper layer is reinforced mixed with mud.

1. Earthwork excavation and foundation trench treatment: according to the design drawings and actual foundation conditions, mechanical excavation and manual trench cleaning are adopted.

2. After the foundation trench is processed, check whether there is any bad soil in the foundation. Bad soil usually refers to silt, quicksand, loose soil pits, caves, old foundations, etc. If any bad soil is found, the design unit shall be contacted in time to propose a technical treatment plan, and a detailed record of the good soil shall be made in the foundation inspection record table, including the type, scope, coordinate position, depth, etc. of the soil, and the quality acceptance shall be made during the treatment process. If local silt is found after excavation of the foundation pit, it is generally required to dig to the old soil. The scope and depth of the silt shall be recorded, and the materials and inspection data for backfilling and tamping of the deep excavation part shall be complete.

3, the foundation treatment immediately after the pouring of plain concrete foundation, in the construction process in strict accordance with the requirements of the ratio, can not reduce the grade and jerry-building and can not reach the design grade. In the construction of the production of test blocks, after inspection to meet the requirements of plain concrete and steel concrete design label, and do a good job of concrete proportioning test report and technical personnel to the team issued a notice of concrete proportioning. And at any time to do a good job in the maintenance of concrete.

4. Before pouring steel concrete, check whether the position, size, elevation, formwork, etc. of steel bars meet the design requirements, steel bars and embedded parts, embedded holes check whether their quantity, diameter, position and lap are in conformity with the design specifications against the drawings, and carefully make acceptance records of concealed works. The garbage, soil and oil pollution of steel bars in the formwork shall be removed, and water shall be added to wet, but no accumulated water is allowed, check the position and size of expansion joint.

5, steel concrete can refer to the ratio scheme provided by the design drawings, which is mainly to fully consider the local sand and gravel water content, mud content, choose the local cut practical ratio scheme. In the construction process in strict accordance with the requirements of the ratio, can not reduce the label and cut corners and can not reach the design label. In the construction of the production of test blocks, after inspection to the plain concrete and steel concrete requirements design label, and do a good job of concrete ratio test report and technical personnel to the team issued by the concrete ratio notice.

6, pouring concrete work should be carried out as continuously as possible, before the initial setting of a layer of concrete, the upper layer of concrete pouring, and vibration with inserted vibration rod, to meet the concrete thickness and foundation elevation design requirements. In order to make the upper and lower layers of concrete combined with dense, two layers of casting time generally should not exceed two hours.

7. The casting method of segmented layering or inclined layering is adopted.

8, the use of concrete mixer, mechanical with concrete, so that cement, sand, gravel, water evenly mixed.

9. After the foundation is poured and tamped, in order to ensure the normal operation of cement hydration, the next process construction shall be carried out after full curing. In the first few days of curing, water shall be sprayed once every 3-5 hours to keep the concrete surface moist, and then the number of watering shall be gradually reduced. After curing to a certain extent, the foundation pre-hole (sleeper hole) template shall be removed and protected.

10, track beam foundation casting reference foundation steel concrete, pouring track beam can not appear intermittent. In the process of pouring, the sleeper embedded holes shall be embedded strictly according to the size.

Track installation construction

1. Track positioning

According to the permanent center of the foundation setting-out, the 1.1 shall be rechecked again with theodolite to determine the center line of the track, make the center line pile, tighten it with 1mm steel wire, and use it as the fixed center line during lane installation and kiln construction, and recheck it at any time during construction.

The elevation of 1.2 tunnel kiln wall generally takes the elevation of track plane as the elevation zero point. During the construction, the elevation of ± 0.000 is introduced to the wall of plant on both sides of the kiln with level gauge, and marked as the control datum of kiln height and then moved to the elevation of track plane.

2. Track installation

2.1 shall be straightened before the track is laid;

When the 2.2 track is installed, an expansion joint of 8~10 ㎜ should be left between the two tracks. The direction of the track splint and bolt is correct, the bolt fastening should be appropriate, and the joint between the two tracks is best staggered by a certain distance. If the strength of the poured concrete does not reach 70%, other works and traffic shall not be carried out within the scope of the track;

Allowable deviation of 2.3 track installation:

Deviation between rail center line and tunnel kiln center line± 2.0mm;

Horizontal deviation of rail (vertical and horizontal height)± 2.0mm;

Rail joint height difference± 2.0 ㎜.

Construction requirements for track installation