What is a test pile and an engineering pile, and the difference between a test pile and an engineeri

Engineering piles: piles used in formal projects, most of which are piles for pile foundation projects. Generally, only the integrity test of the pile is done, and the bearing capacity test is no longer done.

Pile test. The purpose of testing the pile performance in the formal project is: to test whether there is a problem in the design calculation, whether the engineering pile can meet the needs of the design ultimate bearing capacity (or pull-out force), and to test the construction quality. Generally, the test pile will be used as an engineering pile after slotting.

Destructive test pile: According to the geotechnical exploration report, the design intends to select the bearing layer.

and pile type. Destructive pile testing is used to test whether there is a problem with the design calculations and how much ultimate bearing capacity (or pull-out force) the pile type and bearing layer can provide. If the conservative value is too large, the design will be further optimized and the project cost will be reduced, and if the conservative value is too small, it needs to be strengthened.

Generally, destructive test piles will no longer be used as engineering piles, and the site is located in the adjacent buildings or open spaces in the buildings outside the site. But friction piles.

The bearing capacity can be restored, generally about a month will be restored, can still be used as engineering piles, mainly depends on the degree of conservatism of the designer.

Usually the design is carried out through the survey report and the preliminary design.

Destructive pile test Optimization design Engineering pile construction (simultaneous construction of test pile).

Engineering piles are piles that are used in engineering and are ultimately stressed in construction and structures. Engineering pile is used in the pile of the engineering entity, to bear a certain load, the test pile is used for detection design, if it is a relatively large project, to do the test pile alone, if the less important project, with the entity can also be done. The test pile is driven first, and the test can be carried out only after 28 days, and the engineering pile is driven after the test is qualified.

It is nearly 1 month slower than the working period of test piles and engineering piles. However, the main purpose of the test pile is to test whether the geological conditions are consistent with the test report, but it is not necessary to wait for the quality of the test pile to be qualified before starting to drive the engineering pile.

Pile test. It is the pile driver selection that needs to be carried out according to the characteristics and physical and mechanical properties of the soil in the geological survey report before the foundation construction of the building.

Engineering piles. It is a pile that is used in engineering to act on the final construction and structure.

The test pile is divided into design test pile, pre-construction test pile, and post-construction test pile. All projects should be tested after the construction of the pile foundation, and the quality assessment and acceptance should be carried out according to the pile test report (the pile test is completed after the construction).

The engineering pile is a pile used in the engineering entity, to bear a certain load, the test pile is used for detection design, if it is a relatively large project, it is necessary to do the test pile separately, if the project is not too important, it can also be done on the entity.

Pile test.

Pile testing is to provide first-hand information on the first construction parameters for a wide range of pile sinking operations, including effective pile length, rock depth, sediment, and penetration.

Pile welding, bearing capacity. Generally, in the case of inexperienced or important projects, the test pile should be designed first. According to the geological report and local experience, the characteristic value of the vertical bearing capacity of the pile type and the single pile is selected, and a certain number of piles are randomly selected for dynamic measurement and static load test after comprehensive construction, so as to verify that the quality of the pile, that is, the characteristic value of the vertical bearing capacity of the single pile, meets the design requirements, and reinforcing measures should be taken when it is not satisfied.

Engineering piles. It is a pile that is used in engineering and is ultimately stressed in construction or structure. Engineering piles are piles used on engineering entities, which have to bear a certain load, and test piles.

It is used for detection design, if it is a relatively large project, it is necessary to do a separate test pile, if it is not too important a project, it can also be done on the entity.

There are three types of pile test, design test pile, pre-construction test pile and post-construction test pile.

Design test pile: According to the geological report and local experience, select the pile type and the characteristic value of the vertical bearing capacity of the single pile.

The purpose is to further determine the construction feasibility of the selected pile type, so as to avoid finding that the pile type is not suitable for the construction of the site or finding that the bearing capacity of the pile is much less than the calculated value provided by the geological report. The second is to determine the characteristic value of the vertical bearing capacity of the single pile according to the vertical static load test of the single pile. Since the values provided in the geological report tend to be conservative, the bearing capacity of the piles can be increased and the number of piles can be reduced according to the static load report.

Static piles are used.

In the construction method, the construction pile pressing force is related to the characteristic value of the bearing capacity of the single pile, but it is not absolute, and it should be based on experience and local standards.

It can be eigenvalue, as long as the static load test.

To meet the requirements, (if you are sure, you can also use times) when the construction pile force can be used in full construction, the pile test standard can be used.

Pre-construction pile test: According to the actual situation of the project, decide whether to do pre-construction pile test. Pre-construction test piles can be kept as engineering piles.

Among them, there are three situations in which pre-construction pile testing must be done according to the specification:

1. The design grade is a pile foundation of grade A and grade B.

2. The geological conditions are complex and the reliability of pile construction quality is low;

3. New pile type or new process adopted in the region.

After the end of construction, test pile: according to the geological report and local experience, select the characteristic value of the pile type and the vertical bearing capacity of the single pile, and randomly select a certain number of piles for dynamic measurement and static load test after comprehensive construction, so as to verify that the quality of the pile, that is, the characteristic value of the vertical bearing capacity of the single pile, meets the design requirements, and reinforcing measures should be taken when it is not met.

Generally, in the case of inexperienced or important projects, the test pile should be designed first. After the completion of the construction of the pile foundation, all projects should be tested for construction, and the quality assessment and acceptance should be carried out according to the pile test report.

There are two types of test piles:1

For the static load test before the start of construction, the location shall not be selected at the engineering pile. The wild load is added to the maximum ultimate load capacity. The aim is to provide an accurate characteristic value of the bearing capacity of the monopile to the design. This pile cannot be used as an engineering pile after the test (because it has been damaged by compression);

In accordance with the static load test of the engineering piles sampled according to the regulations, the load is increased to be equivalent to two times or slightly larger than the bearing capacity of the single pile. The aim is to verify the capabilities of the engineering piles represented. After this pile has been tested, it proves that it can be used as an engineering pile.

Whether the test pile can be made of engineering piles depends on the supervising engineer and builder on site. The pile test is to provide first-hand first-hand construction parameter data for a wide range of pile sinking operations, including effective pile length, rock entry depth, sediment, penetration, pile welding, and bearing coarse collapse load. Generally, in the case of inexperienced or important projects, the test pile should be designed first.

The purpose of the pile test 1, when selecting the pile type, pile length and pile holding layer of the pile holder for test piling, the following provisions should be met: 1) The engineering geological conditions of the test piling location should be representative. 2) In the process of test piling, the test should be carried out one by one according to the soil layer entered by the pile end; When the bearing layer is thicker, the rock should be tested multiple times in the same soil layer.

2.The bearing layer at the end of the pile should be comprehensively determined according to the relationship between the bearing capacity and the penetration degree of the test piling results, combined with the geotechnical engineering investigation report of the site.

Pile test. There are two kinds:1

Before the start of construction. Static load.

test, the location should not be selected.

Engineering piles. Place.

Load. Add to.

Maximum limit. Carrying capacity.

The purpose of the alignment is to provide the design with an accurate monopile bearing capacity.

Eigenvalue. This pile cannot be used as an engineering pile after the test (because it has been damaged by compression);

Static load test of engineering piles sampled in accordance with regulations.

The hidden load is added to double or slightly greater than the designed load capacity of the monopile. The purpose is to verify the capability of the engineering piles represented by Pei Xian. After the test of this pile, it is further proved that it can be used as engineering piles.