阅读说明：本技术 一种非截桩法静压预应力管桩试桩桩顶标高控制施工工艺 (Pile top elevation control construction process for static pressure prestressed pipe pile test by non-pile cutting method ) 是由 汪程锦 刘宝堂 于 2021-08-19 设计创作，主要内容包括：本发明公开了一种非截桩法静压预应力管桩试桩桩顶标高控制施工工艺,属于建筑施工技术领域。本发明的步骤为：步骤一、测量原始土方方格网,现场原始场地清表；步骤二、预先选取有代表性的三根试桩进行提前施工并做静压荷载试验；步骤三、对试验数据进行分析；步骤四、根据桩顶标高、嵌入基础承台的高度、试桩最终沉降量,预制统一的试桩桩顶接桩长度的桩基；步骤五、对现场原始场地标高进行适当清表,保证后期桩基静压荷载逐步开展；步骤六、桩基开挖完成后,对桩顶接桩的桩基进行切割,进行下道工序施工。本发明可以有效保证试桩桩基的施工质量,减少桩顶标高不到位的截桩工艺,有效的保证了工期及试桩数据的准确性。(The invention discloses a non-pile cutting method static pressure prestressed pipe pile test pile top elevation control construction process, and belongs to the technical field of building construction. The method comprises the following steps: measuring an original earthwork square grid, and clearing a surface of an original field on site; secondly, selecting three representative test piles in advance for construction in advance and carrying out a static pressure load test; analyzing the test data; step four, prefabricating a pile foundation with uniform pile-splicing length of the pile top of the test pile according to the pile top elevation, the height of the embedded foundation bearing platform and the final settlement of the test pile; step five, carrying out appropriate clearing on the elevation of the original site on site, and ensuring that the static pressure load of the pile foundation at the later stage is gradually developed; and step six, after the excavation of the pile foundation is finished, cutting the pile foundation of the pile top pile, and performing next procedure construction. The invention can effectively ensure the construction quality of the pile foundation of the test pile, reduce the pile cutting process with the height mark of the pile top not in place and effectively ensure the construction period and the accuracy of the test pile data.)

1. A pile top elevation control construction process for a non-cut pile method static pressure prestressed pipe pile test is characterized in that: the method comprises the following steps:

measuring an original earthwork square grid, and clearing a surface of an original field on site;

secondly, selecting three representative test piles in advance for construction in advance and carrying out a static pressure load test according to drawing design requirements, a geological survey report, soil layer distribution conditions and test pile position positions;

analyzing the test data, then carrying out data comparison analysis according to the nature of soil reported by a geological survey, the model of a pile foundation, the diameter of the pile and the previous construction experience, estimating the settling volume and the pile foundation floating condition of the test pile at other positions after pressure test, and comprehensively judging the final settling volume of the test pile;

step four, prefabricating a pile foundation with uniform pile-splicing length of the pile top of the test pile according to the pile top elevation, the height of the embedded foundation bearing platform and the final settlement of the test pile;

step five, according to the pile foundation of the pile splicing of the prefabricated test pile top, according to the elevation of the pile top, the elevation of the original site on site is properly cleared, and the static pressure load of the pile foundation in the later period is ensured to be gradually developed;

and step six, after the excavation of the pile foundation is finished, cutting the pile foundation of the pile top pile, and performing next procedure construction.

Technical Field

The invention relates to the technical field of building construction, in particular to a pile top elevation control construction process for a non-pile cutting method static pressure prestressed pipe pile test.

Background

At present, the static pressure load test aiming at the tubular pile test is mainly to carry out the pile foundation load test directly on the pile top after the earthwork excavation molding, but the scheme can cause the excavated foundation pit to be soaked by rainwater for carrying out the foundation pit treatment due to the influence of the test period, particularly in rainy season, because the pile foundation static pressure load test is carried out from the earthwork excavation to the elevation of the pile top. At present, most of construction management is to excavate foundation pit interfaces simultaneously, and the whole inspection and acceptance cannot be realized, so that the construction period and the construction cost are influenced, and the significance of application research on the control of the pile top elevation of the static pressure prestressed pipe pile test pile by the non-pile cutting method is mainly as follows:

(1) the traditional static pressure load of the tubular pile is mainly used for setting a test pile according to the original site elevation during the construction of the tubular pile, so that the condition that after a foundation pit is excavated and formed, one more construction process, namely pile cutting construction, is not considered, and the construction process is not consistent with the method specified by a drawing; aiming at the application research of pile top elevation control of a non-pile cutting method static pressure prestressed pipe pile test, the short pile for pile splicing is specially customized to carry out a load test through the difference value of the pile top elevation of the position of the test pile and the original elevation, so that after the excavation of a foundation pit is finished, the short pile for pile splicing at the pile top is only required to be cut off, and then the inserted bars are placed into the short pile, and the requirements of the non-pile cutting method construction process designed by a drawing are still met.

(2) In the traditional static pressure load test of the tubular pile, because of the construction of a pile cutting method in the later stage, a series of procedures such as pile cutting, hole cleaning, pile head treatment and the like exist, the construction process is rough, the quality of the pile head is not easy to control, and the cost of the pile head treatment is increased; however, the application research of pile top elevation control of the non-pile cutting method static pressure prestressed pipe pile can reduce certain procedures, and the method is simple to operate and high in efficiency.

(3) Tubular pile load test after traditional foundation ditch shaping, because of test period's influence, especially in rainy season, thereby can cause the excavation foundation ditch rainwater to soak and carry out the foundation ditch and handle, present construction management, the majority is excavation foundation ditch interface simultaneously, unable whole acceptance, thereby influence time limit for a project and construction cost, but the application research of control of pile head elevation is tried to the static pressure prestressing force tubular pile of non-cutting method, can guarantee completely when other pile foundations are under construction, the work of trying the pile can be carried out in step to corresponding pressure testing pile, effectively practice thrift the time limit for a project.

Disclosure of Invention

1. Problems to be solved

Aiming at the defects and shortcomings in the prior art, the invention provides a construction process for controlling the elevation of the pile top of a non-pile cutting method static pressure prestressed pipe pile test pile, which is used for carrying out construction research on the test pile through analysis control on the elevation of the pile top of the test pile, analysis on the elevation of a pile end bearing layer at the position of the test pile, control research on the pile splicing length of the pile top of the test pile, unified planning on the original site elevation, analysis on test pile data and the like.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a pile top elevation control construction process for a non-pile cutting method static pressure prestressed pipe pile test comprises the following steps:

measuring an original earthwork square grid, and clearing a surface of an original field on site;

secondly, selecting three representative test piles in advance for construction in advance and carrying out a static pressure load test according to drawing design requirements, a geological survey report, soil layer distribution conditions and test pile position positions;

analyzing the test data, then carrying out data comparison analysis according to the nature of soil reported by a geological survey, the model of a pile foundation, the diameter of the pile and the previous construction experience, estimating the settling volume and the pile foundation floating condition of the test pile at other positions after pressure test, and comprehensively judging the final settling volume of the test pile;

step four, prefabricating a pile foundation with uniform pile-splicing length of the pile top of the test pile according to the pile top elevation, the height of the embedded foundation bearing platform and the final settlement of the test pile;

step five, according to the pile foundation of the pile splicing of the prefabricated test pile top, according to the elevation of the pile top, the elevation of the original site on site is properly cleared, and the static pressure load of the pile foundation in the later period is ensured to be gradually developed;

and step six, after the excavation of the pile foundation is finished, cutting the pile foundation of the pile top pile, and performing next procedure construction.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

the pile top elevation control construction process for the non-pile-cutting static-pressure prestressed pipe pile is used for carrying out construction research on pile testing through analysis control on the height of the pile top of the pile to be tested, analysis on the elevation of a pile end bearing layer at the position of the pile to be tested, control research on the pile-connecting length of the pile top of the pile to be tested, unified planning on the original site height, analysis on pile testing data and the like, is applied to actual engineering, can effectively guarantee the construction quality of the pile foundation of the pile to be tested, reduces the pile-cutting process with the height of the pile top not in place, and effectively guarantees the construction period and the accuracy of the pile testing data.

Drawings

Fig. 1 is a schematic view of the construction structure of the present invention.

In the figure: 1. the original site elevation; 2. clearing the site; 3. prefabricating a pile foundation of a pile top splicing pile; 4. pile top; 5. other soil layers; 6. a cushion layer; 7. a bearing stratum; 8. an end plate; 9. and (6) pile testing.

Detailed Description

The invention will be further described with reference to specific embodiments and the accompanying drawings in which:

example 1

Referring to fig. 1, the construction process for controlling the pile top elevation of the non-pile cutting method static pressure prestressed pipe pile test of the embodiment includes the following steps:

firstly, measuring an original earthwork square grid 1, and clearing a table 2 of an original field on site;

secondly, selecting three representative test piles 9 in advance for construction in advance and carrying out a static pressure load test according to drawing design requirements, a geological survey report, soil layer distribution conditions and test pile position positions;

analyzing the test data, then carrying out data comparison analysis according to the nature of soil reported by a geological survey, the model of a pile foundation, the diameter of the pile and the previous construction experience, estimating the settling volume and the pile foundation floating condition of the test pile at other positions after pressure test, and comprehensively judging the final settling volume of the test pile;

step four, prefabricating a pile foundation 3 with uniform pile-splicing length of the pile top of the test pile according to the pile top elevation 4, the height of the embedded foundation bearing platform and the final settlement of the test pile;

and step five, according to the pile foundation 3 of the prefabricated test pile top pile extension, according to the pile top elevation, properly clearing the elevation of the original site on site 2, and ensuring that the static pressure load of the pile foundation in the later period is gradually developed.

And step six, after the excavation of the pile foundation is finished, cutting the end plate 8 of the pile foundation 3 of the pile top pile, and performing next procedure construction.

The method carries out construction research on the test pile by analyzing and controlling the elevation of the pile top of the test pile, analyzing the elevation of the pile end bearing layer at the position of the test pile, controlling and researching the pile extension length of the pile top of the test pile, uniformly planning the original elevation of the field, analyzing the data of the test pile and the like, is applied to actual engineering, can effectively ensure the construction quality of the pile foundation of the test pile, reduces the pile cutting process with the elevation of the pile top not in place, and effectively ensures the construction period and the accuracy of the data of the test pile.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, to which the actual method is not limited. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.