CN1974941A - Bottom reaming piling method - Google Patents

Abstract

The present invention discloses a construction method of building pile foundation engineering, in particular, it relates to a belling pile-forming method of pipe-sinking belled pile. Said belling pile-forming method includes the following steps: pressing the sinking pipe with metal pile head to the hard soil layer with designed level; taking out metal pile head; utilizing belling equipment to enlarge base and make the base be formed into a base hollow cavity,; using camera to record the image formation in the base hollow cavity; pouring the prepared concrete into the base hollow cavity to form concrete base; downwards placing the prefabricated reinforced concrete pile body and making said prefabricated reinforced concrete pile body and cast-in-situ concrete base be butt-connected together and anchored into one body; drawing out said sinking pipe and pouring cement slurry so as to obtain the invented pile.

Description

At the bottom of a kind of expansion, piling method

Technical field

At the bottom of the present invention relates to the expansion of a kind of construction of building pile foundation engineering, particularly ram-expanded pile, piling method.

Background technology

The quality of building foundation engineering quality will directly influence the quality of building, so each unit in charge of construction not only payes attention to the construction quality of superstructure, and more pay attention to the quality of Foundation Design.And drop into scientific research strength and tap the latent power to pile foundation engineering, make it in the utilization rate of guaranteeing to improve under the prerequisite of workmanship the strength of materials.For the expanded bore pile that improves bearing capacity of single pile, composite foundation stake etc. occur in succession, although this bearing capacity of single pile than traditional foundation pile is significantly improved, but because traditional pile foundation engineering job practices is with manually bit by bit cutting the earth, fetch earth and dig pile body soil, and for prevent that landslide from digging next section of certain depth immersed tube downwards thereupon, when waiting to dig design elevation, the people is sling, expand the end with traditional bottom-expanding equipment again, and be positioned on the hardpan, hang out after the moulding and directly water the concrete pile after bottom-expanding equipment fetches earth.Thereby visible traditional pile foundation expands the end, also there is following defective in piling method: the pile body part soil body is with manually diging up, and working face is too big, and the workload that fetches earth obviously increases, inefficiency, cost height; Bottom-expanding equipment is not owing to there is immersed tube to do support, and the location is inaccurate, and the base expanded-angle is too little, and each parameter that expands in the end process can not guarantee, thereby makes the quality of stake be not easy control, and is difficult to reach designing requirement, causes the bearing capacity of single pile to be had a greatly reduced quality; Have constructor's potential safety hazard, the constructor does not note just being prone to accidents slightly; The scope of application is narrow, not only is not suitable for the minor diameter pile body and expands the end, nor can be used for expanding the end and pile under precast pile and the high complicated geological situation.Based on above-mentioned situation, for improving bearing capacity of single pile, reduce the Foundation Design cost, must be improved.

Summary of the invention

The present invention is directed to the problem that above-mentioned technology exists, all kinds of pile bodies that are applicable to various building safety grades, geological condition are provided, guarantee the pile foundation engineering quality, obviously improve bearing capacity of single pile, improve the strength of materials and utilization rate, raising pile efficient, at the bottom of the expansion of safety, piling method.

In order to solve the problems of the technologies described above, the present invention be achieved in that expand the end, piling method is as follows: the immersed tube that it comprises following processing step: a, will have a metal pile head passes weak soil and is laminated to the design elevation hardpan; B, taking-up metal pile head are thrown away discrete object from the immersed tube mouth, cut the earth with bottom-expanding equipment and expand the bottom application worker, and the vertical earlier expansion end is the level expansion end again, expands the end and cuts the earth till reaching designing requirement base cavity pocket type; C, the surflaes in the base is taken out; D, usefulness have the video camera of light source and check in base cavity pocket whether its quality reaches designing requirement, and record by imaging is filed the correction in time of pinpointing the problems; E, will be in the good concrete of floor manufacture be packed long bucket into, be put into the immersed tube bottom from the immersed tube mouth, when being located at the iron staff contact pan soil of bucket bottom, the bucket bottom door is backed down, concrete in it falls into base cavity pocket and forms cast-in-situ base, is lowered to the precast reinforced concrete pile body and docks anchoring by its bottom joint bar with the Cast-in-place concrete base to be integral; F, extract immersed tube, along the slit grout injection pile of extracting behind the immersed tube.

Advantage of the present invention and effect are as follows:

The present invention compared with prior art, owing to utilized a series of technical measures such as immersed tube, bottom-expanding equipment and precast pile with metal pile head, and the advanced production technology of employing, there is process simply advanced through evidence, expand chamber, end regular geometry, needn't get pile body chamber soil, pile-forming speed is fast, the efficient height, and the ratio range that expands bottom face diameter and pile body cross section is big, effectively improve bearing capacity of single pile, and reach designing requirement, and guarantee the pile foundation engineering quality, reduce building costs, improve strength of materials utilization rate, stake is worked under most economical state; The scope of application is wide simultaneously, adopt the pile body and corresponding base-enlarging method, the plant equipment that are complementary with it to replace manually-operated according to building safety grade and different geological conditions, not only improve operating efficiency, shortened the construction period, but also obviously reduced the earth volume of cutting the earth, improved working security, accident potential appears in minimizing.And adopt video camera to check in base cavity pocket whether its construction quality reaches designing requirement with light source, and record by imaging is filed, pinpoint the problems and in time correct, in time adjusting job practices and material therefor when promptly pinpointing the problems adopts remedial measures, construction quality is guaranteed, and the underground construction situation can be allowed the ground handling personnel in time grasp.

The specific embodiment

The present invention expands the end, piling method: it is to be realized by following activities: a, the immersed tube that will have a metal pile head pass weak soil and are laminated to the design elevation hardpan; B, taking-up metal pile head are thrown away discrete object from the immersed tube mouth, cut the earth with bottom-expanding equipment and expand the bottom application worker, and the vertical earlier expansion end is the level expansion end again, expands the end and cuts the earth till reaching designing requirement base cavity pocket type; C, the surflaes in the base is taken out; D, usefulness have the video camera of light source and check in base cavity pocket whether its quality reaches designing requirement, and record by imaging is filed the correction in time of pinpointing the problems; E, will be in the good concrete of floor manufacture be packed long bucket into, be put into the immersed tube bottom from the immersed tube mouth, when being located at the iron staff contact pan soil of bucket bottom, the bucket bottom door is backed down, concrete in it falls into base cavity pocket and forms cast-in-situ base, is lowered to the precast reinforced concrete pile body and docks anchoring by its bottom joint bar with the Cast-in-place concrete base to be integral; F, extract immersed tube, along the slit grout injection pile of extracting behind the immersed tube.

Method of the present invention can be built according to different safety class, geological condition and adopt pile body and the base-enlarging method that is complementary with it, and the scope of application is wide.

Claims (1)

1, at the bottom of a kind of expansion, piling method, the immersed tube that it comprises following processing step: a, will have a metal pile head passes weak soil and is laminated to the design elevation hardpan; B, taking-up metal pile head are thrown away discrete object from the immersed tube mouth, cut the earth with bottom-expanding equipment and expand the bottom application worker, and the vertical earlier expansion end is the level expansion end again, expands the end and cuts the earth till reaching designing requirement base cavity pocket type; C, the surflaes in the base is taken out; D, usefulness have the video camera of light source and check in base cavity pocket whether its quality reaches designing requirement, and record by imaging is filed the correction in time of pinpointing the problems; E, will be in the good concrete of floor manufacture be packed long bucket into, be put into the immersed tube bottom from the immersed tube mouth, when being located at the iron staff contact pan soil of bucket bottom, the bucket bottom door is backed down, concrete in it falls into base cavity pocket and forms cast-in-situ base, is lowered to the precast reinforced concrete pile body and docks anchoring by its bottom joint bar with the Cast-in-place concrete base to be integral; F, extract immersed tube, along the slit grout injection pile of extracting behind the immersed tube.