How to leave the test block of concrete cast in place support pile?

Requirements for the retention of concrete cast-in-place pile test blocks:

1. A set of standard maintenance.

2. A group of maintenance under the same conditions.

3. If it is winter construction, leave a group of test blocks for normal temperature maintenance.

4. Each construction team must retain a group of test blocks of up to 100 cubic meters.

For piles with a diameter of more than 1m or piles with a single pile concrete of more than 25m3, 1 group of specimens should be left in the concrete of each pile; For piles with a diameter of no more than 1m or piles with a single pile of concrete not exceeding 25m3, 1 group of specimens shall be left for each pouring shift, and 3 specimens shall be left for each group of specimens.

How to place concrete test blocks in concrete cast-in-place piles.

1. Article (strong article) of the national standard "Code for Acceptance of Construction Quality of Building Foundation Engineering" GB50202-2002 stipulates:

For piles of cast-in-place piles, there must be 1 set of specimens for every 50m3 poured, and for piles less than 50m3, there must be 1 set of specimens for each pile. (For some piles with large diameters, pouring less than 50 cubic meters, each one does a group of specimens, and more than 50 cubic meters according to every 50 cubic meters, one more group).

2. Article (non-strong) of the industry standard JGJ94-2008 "Code for Building Pile Foundation":

For piles with a diameter of more than 1m or piles with a single pile concrete of more than 25m3, 1 group of specimens should be left in the concrete of each pile; For piles with a diameter of no more than 1m or piles with a single pile of concrete not exceeding 25m3, 1 group of specimens shall be left for each pouring shift, and 3 specimens shall be left for each group of specimens.

3. There is no need to set up a test block under the same condition for cast-in-place piles, because it cannot be maintained under the same conditions.

Each pile retains a group of standard sample test blocks, and the curing age of the standard sample test blocks is 3-7 days after the test blocks are formed, and they are sent to the standard curing room for curing. It is also said that the amount of watering on the day does not exceed 50m to make a group of standard sample test blocks, and more than 50m part to do another group.

The supporting pile test block can be carried out in accordance with the construction quality acceptance specifications of the building foundation engineering, which is a group of every 50m3, and if the area is not strictly implemented, it can be implemented in accordance with a group of every 100m3, which should be implemented according to the requirements of the local quality supervision station.

GB50204-2002 stipulates that the sampling requirements for concrete are not less than 100m3 in a group, if according to the pile, it should be each, I don't know how big your pile is!!

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The latest specifications for pile foundation test block retention are as follows:

1. Sampling and retention of concrete test blocks for foundation engineering, for composite foundations: when there are requirements for the strength inspection of a single pile, the number of inspections is 1% of the total amount, but not less than 3, and each pile is retained with 1 group of standard test blocks.

For pile foundation (cast-in-place pile): in accordance with GB50202 (mandatory provisions), there must be 1 group of test blocks for every 50m2 poured, and for piles less than 50m3, each pile must have 1 group of test blocks (standard maintenance); For pile foundations, it is not necessary to retain the specimens under the same conditions, and it is recommended that the construction party and the supervision party jointly negotiate and determine before construction.

2. Sampling and retention of concrete test blocks for concrete structure engineering, the principle of sampling and retention of standard curing test blocks, when the amount of concrete poured continuously at one time is less than or equal to 1000 cubic meters, the concrete sampling of the same mix ratio shall not be less than once every 100m3; When the amount of concrete poured continuously exceeds 1,000 cubic meters, the concrete of the same mix ratio shall not be less than once every 200m3.

The principle of sampling and retention of the same condition curing test block (an important basis for the acceptance of concrete structures): the structural components or structural parts corresponding to the curing test pieces under the same conditions should be jointly selected by the supervision (construction), construction and other parties.

According to the principle of reflecting the important parts of the building structure and appropriately controlling the number of physical inspections of Wang demolition trouble, the important parts are recommended as follows: walls, columns, and core tubes in the vertical components, beams with a span of 8m, unidirectional slabs with a span of 5m, two-way slabs with a span of 6m, prestressed concrete beams, and cantilever beams with a span of 2m.

If the project does not meet the above conditions, the same condition of the same strength level should be maintained according to the specification of the specimen should not be less than 10 groups, and should not be trapped in 3 groups, the project can be determined in the specific implementation of the project on the basis of consultation with the supervision.

3. The principle of retention of waterproof concrete test blocks, and the standard maintenance of waterproof concrete. Impermeability test block retention principle: a group of impermeability test blocks (a group of 6 impermeability test blocks) should be retained every 500m3 of continuous pouring concrete, and each project shall not be less than two groups.

When the mix ratio is adjusted, the number of indwelling groups of the test block should be increased accordingly.

The pile foundation test block retention is the concrete specimen that the pile pouring molding is the retention is very important, and the acquisition of each data is very important for the subsequent construction, and the data obtained through the pile foundation test block is very critical.

1. Article (strong article) of the national standard "Code for Acceptance of Construction Quality of Building Foundation Engineering" GB50202-2002 stipulates:

There must be 1 set of specimens for every 50m3 poured, and for piles less than 50m3, each pile must have a set of specimens. (For some piles with large diameters, the amount of pouring is less than 50 cubic meters, each one makes a group of specimens, and more than 50 cubic meters is made according to every 50 cubic meters, and one more group is made).

2. Article (non-strong strip) in the industry standard JGJ94-2008 "Code for Building Pile Foundation": piles with a diameter of more than 1m or piles with a single pile of concrete exceeding 25m3, each pile pile body concrete should be left with 1 group of specimens; For piles with a diameter of no more than 1m or piles with a single pile of concrete not exceeding 25m3, 1 group of specimens shall be left for each pouring shift, and 3 specimens shall be left for each group of specimens.

3. There is no need to set up a test block under the same condition for cast-in-place piles, because it cannot be maintained under the same conditions.

Regardless of the GB50202-2002 or JGJ94-2008, it is only said that one group of specimens should be retained, and it is not like other concrete specifications to say that a group of standard maintenance and a group of the same conditions are left. Therefore, combined with the actual situation, the cast-in-place pile cannot be left with the same condition test block, therefore, there is no provision in the specification.

Generally speaking, the pile foundation of the bridge, CFG, are not wanted, which means that the concrete buried in the ground is not to be done, and the homotrophic specimen is leaked outside the pouring body (important part) bearing cap does not need to be done, and the pier body, pier cap, and beam must be done (downstairs, the landlord said that it is the same condition, see clearly, it is not standard, and the standard is now standardized or done on the construction site, and the next day it is taken back to the curing room to dismantle the mold for maintenance).

The requirements for the indwelling of concrete cast-in-place pile test blocks are as follows:

1. A set of standard maintenance.

2. A group of maintenance under the same conditions.

3. If it is winter construction, leave a group of test blocks for normal temperature maintenance.

4. Each construction team must retain a group of test blocks of up to 100 cubic meters.

Details are as follows:

For piles with a diameter of more than 1m or piles with a single pile concrete of more than 25m3, one group of specimens should be left for each pile body concrete; For piles with a diameter of no more than 1m or piles with a single pile of concrete not exceeding 25m3, 1 group of specimens should be left for each pouring platform, and 3 specimens should be left for each group of specimens.

Control the quality of raw materials for concrete. The cement entering the site should be verified with the factory certificate, and the stability and strength of the cement should be tested, such as the cement that has been stored for more than 3 months or agglomerated by moisture, and must be applied according to the retest mark after the retest. Choose clean medium coarse sand, and choose stones with good grading and mud content of no more than 2%.

The specific regulations are as follows:

The mixing ratio of mixed concrete should be based on the required strength grade, the slump of construction, and the raw materials by the laboratory from the best mix ratio of high quality, low quality, and conducive to construction. The grinding ruler is measured correctly, and the material weight deviation of each tray of concrete should not exceed the following provisions: cement, external mixture; 2%；Coarse and fine aggregates:

3%。Water and admixture solution: 2%.

Summary. Hello dear! Article GB50202-2002 of the national standard "Code for Acceptance of Construction Quality of Building Foundation Engineering" stipulates:

There must be 1 group of specimens for every 50m3 poured, and 1 group of specimens for piles less than 50m3 must be there for each pile. (For some piles with large diameters, pouring less than 50 cubic meters, each one to do a group of specimens, more than 50 cubic meters according to every 50 cubic meters, one more group) 2, industry standard JGJ94-2008 "Building Pile Foundation Specification" in the first article (non-strong strip): Piles with a diameter greater than 1m or piles with a single pile concrete of more than 25m3, each pile pile body concrete should be left with 1 group of specimens:

For piles with a diameter of no more than 1m or piles with a single pile of concrete not exceeding 25m3, 1 group of specimens shall be left for each pouring shift, and 3 specimens shall be left for each group of specimens.

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Hello dear! 1. A set of standard maintenance. 2. A group of maintenance under the same conditions. 3. If it is winter construction, leave another acre of celery group to transfer to the test block of normal temperature maintenance and brigade protection. 4. A maximum of 100 cubic meters must be left for each demolition wheel construction team.

Hello dear! Article GB50202-2002 of the national standard "Code for Acceptance of Construction Quality of Building Foundation Lack of Hall Cavity Engineering" stipulates that there must be 1 group of specimens for every 50m3 poured, and 1 group of specimens must be there for piles less than 50m3.

For some piles with a large diameter, the amount of pouring is less than 50 cubic meters, each one makes a group of specimens, and more than 50 cubic meters will be done according to every 50 cubic meters, one more group) 2, the industry standard JGJ94-2008 "Code for Building Pile Foundation" in the first article (non-strong strip): For piles with a diameter of more than 1m or piles of more than 25m3 on a single pile concrete, 1 group of specimens should be left for each pile pile body concrete: piles with a diameter of no more than 1m or piles with a single pile concrete not exceeding 25m3, and 1 group of volcanic test pieces should be set up for each pouring platform. 3 pieces should be left for each group of test pieces.

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