CN101603311A

CN101603311A - The adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method

Info

Publication number: CN101603311A
Application number: CNA2009100884779A
Authority: CN
Inventors: 何世鸣; 李江; 田震远; 周与诚; 吴盛斌; 张明中; 王之军; 贾城; 陈辉; 李长生; 司呈庆; 杨敏; 王建明; 程金霞; 黄鑫峰; 洪伟
Original assignee: Beijing Urban Construction Science And Technology Promotion Association; SINOMA GEOLOGICAL ENGINEERING EXPLORATION ACADEMY; BEIJING CONSTRUCTION MATERIAL AND GEOLOGICAL ENGINEERING Co
Current assignee: BEIJING BUILDING MATERIAL GEOLOGICAL ENGINEERING CORP; BEIJING URBAN CONSTRUCTION SCIENCE TECHNOLOGY PROMOTING ASSOCIATION; Shenzhen Nanhua Geotechnical Engineering Co ltd; Zhongcai Geological Engineering Exploration Academy Co ltd
Priority date: 2009-07-02
Filing date: 2009-07-02
Publication date: 2009-12-16
Anticipated expiration: 2029-07-02
Also published as: CN101603311B

Abstract

A kind of adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method is characterized in that: at first utilize the percussive drill pore-forming, penetrate banket, underground obstacle or quicksand or the bad grounds such as sandy gravel that easily cave in, adopt with pipe bit; When reaching projected depth, sleeve pipe also reaches target depth; In sleeve pipe, fill in soil afterwards, tamping while banketing; After tamping one section, just sleeve pipe is risen and pull out a segment distance, continue to banket and use tamping, treat just to form a rammed-soil pile after whole sleeve pipe is all extracted ground; Jet drill rig is in place afterwards, at this rammed-soil pile place descending revolution high-pressure rotary-spray concrete mud, thereby efficiently finishes jet grouting pile construction smoothly.The invention has the beneficial effects as follows: utilize adopting heavy hammer-tamping compaction soil preformed hole and form rammed-soil pile,, guarantee carrying out smoothly of jet grouting pile construction for the jet grouting pile construction of back is laid a good foundation, and economical and practical, simple to operate.

Description

The adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method

Technical field

The present invention relates to jet grouting pile construction method in the foundation basic construction of building engineering construction field, specifically is a kind of method of construction high-pressure rotary jet grouting pile under the bad ground situations such as sandy gravel of banketing, having underground obstacle or quicksand or easily cave in.

Background technology

As everyone knows, high-pressure rotary jet grouting pile and construction equipment thereof are light and handy, conveniently moving, and the characteristics of its high-pressure injection are widely used in ground stabilization, water-stop curtain or are used as female stake of foundation pile and slope protection pile.But run into banket, when underground obstacle, quicksand or the bad grounds such as sandy gravel that easily cave in, it is very difficult that construction becomes, jet drill rig playpipe injection smoothly arrives projected depth, just can not guarantee the purpose of ground stabilization, the purpose of water-stop curtain design can not be reached, the foundation pile of design or female purpose of slope protection pile can not be reached.

So people have expected drawing the hole in advance with geological drilling rig or prospecting rig, and then carry out the churning pile, can often draw not setting of casing protection of Kong Houru, the hole of then very easily collapsing makes rotary churning pile to construct, and does not reach purpose of design; As use casing protection, and drawn behind the hole before carrying out the churning operation, still the sleeve pipe of churning section must be extracted can normal operation, but existing all types of rotary jetting apparatus self can't realize that also the limit pulls out the cover tube edge up this operating type of whitewashing.So people find out further method, in the hole, add suitable auxiliary material after drawing the hole, as fill with mud or cement paste or annotate calcium plaster or the insertion pvc pipe, sleeve pipe is pulled out in recurrence then, reaches retaining wall prevents that hole wall from caving in after sleeve pipe is extracted purpose by the auxiliary material that add.But find that by practice effect is not very good, annotating mud or cement paste still annotates calcium plaster and has all increased and stir slurry process together, and require at the uniform velocity, reduce as far as possible vibration during tube drawing, also need to mend slurry at any time according to the wastage of slurries, operation easier and cost have been increased greatly, reduce work efficiency, owing to the existence of some uncertain factors, its success rate also can't reach 100% in addition; When adopting the insertion pvc pipe, its selection is very responsive, must select thin-walled type inferior for use, and quality is more crisp, and high-pressure spray can smash it when guaranteeing churning, has also increased cost and the churning effect is had certain influence.

Summary of the invention

The invention provides a kind of adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method high-pressure rotary jet grouting pile of constructing, efficiently solve the above-mentioned shortcoming that can not guarantee the reliable smooth construction of rotary churning pile fully.

Technical scheme of the present invention is: a kind of adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method is characterized in that: at first utilize the percussive drill pore-forming, penetrate banket, underground obstacle or quicksand or the bad grounds such as sandy gravel that easily cave in, adopt with pipe bit; When reaching projected depth, sleeve pipe also reaches target depth; In sleeve pipe, fill in soil afterwards, tamping while banketing; After tamping one section, just sleeve pipe is risen and pull out a segment distance, continue to banket and use tamping, treat just to form a rammed-soil pile after whole sleeve pipe is all extracted ground; Jet drill rig is in place afterwards, at this rammed-soil pile place descending revolution high-pressure rotary-spray concrete mud, thereby efficiently finishes jet grouting pile construction smoothly.

The invention has the beneficial effects as follows: utilize adopting heavy hammer-tamping compaction soil preformed hole and form rammed-soil pile,, guarantee carrying out smoothly of jet grouting pile construction for the jet grouting pile construction of back is laid a good foundation, and economical and practical, simple to operate.

Description of drawings

Fig. 1 is a construction flow chart of the present invention;

Fig. 2～Fig. 9 is the schematic diagram of formation of pile of the present invention.

The specific embodiment

Referring to Fig. 1～Fig. 9, construction technology process of the present invention is: at first utilize percussive drill 1 at the ground G pore-forming, penetrate banket, underground obstacle, quicksand or the bad grounds such as sandy gravel that easily cave in, adopt with pipe bit and advance (referring to Fig. 2); When reaching projected depth, sleeve pipe 4 also reaches target depth, fills in soil 2 afterwards in sleeve pipe 4, tamps (referring to Fig. 3) while banketing with weight 3; After tamping one section, just sleeve pipe 4 has been made progress and pulled out a segment distance (referring to Fig. 4), treated just to form a rammed-soil pile 2 (referring to Fig. 5) after whole sleeve pipe 4 is all extracted ground; Jet drill rig 5 is in place afterwards, at descending revolution high-pressure rotary-spray concrete mud 6 (referring to the Fig. 6) of these rammed-soil pile 2 places, after jet drill rig 5 whitewashings come downwards to projected depth (referring to Fig. 7), jet drill rig 5 whitewashings are just finished a complete pile 6 (referring to Fig. 9) after transferring up (referring to Fig. 8) disengaging ground.Thereby efficiently finish jet grouting pile construction smoothly, realize the purpose of consolidated subsoil purpose or formation water seal curtain, or realize the construction of female stake of slope protection pile or foundation pile.The construction technology of above-mentioned churning cement paste (Fig. 6～shown in Figure 9, " rotary jetting apparatus is in place " and later technology among Fig. 1) adopts existing technology.

Above-mentioned construction machinery equipment comprises percussive drill, jet drill rig, change-can mixer, high-pressure hydraulic pump, high pressure slurry pump, foul water pump and mortar pump, is existing equipment.

Enumerate several specific embodiments below:

Embodiment 1:

Be positioned at the Haidian District, Beijing City and protect the good fortune Si Qiao southeast Di Ku of space center of the Chinese Academy of Sciences (nine chapter mansion scientific research complex buildings second phase underground garage) foundation pit supporting project, cheat dark 12.6m, be building around the foundation ditch, the southern side is the six layers of residential building in a building apart from foundation ditch limit 7m, underground between foundation ditch and the residential building still have a upper and lower conduit line, gas-pipe line etc., pattern foundation pit supporting structure adopts pile-anchor retaining, heavy rain causes the southern side foundation pit side-wall to cave in later, formation is about the breach that caves in of 25m, cave in the edge under Nan Lougen, comprise electric wire, the upper and lower conduit line, gas-pipe line all cuts off, and whole building, building resident all moves away.Unit in charge of construction further caves in order to prevent the southern side soil body, and the cement that is packed in bag has on the slope been piled up " wall ", and hardening behind the cement chance water hardening also has the sewage manhole that falls down to build well brick and several discarded pipelines simultaneously.Municipal government carries out quick backfill in order to speedily carry out rescue work with the prototype gradation sandstone, and wherein cobble particle diameter 2-20mm does not wait, and the backfill maximum ga(u)ge reaches 7m.Answer the resident of resident family requirement, before the building, play the reinforcing that rotary churning pile carries out backfill in the wide 7.5m scope of long 35m.For this bad ground, the rotary churning pile drilling construction is a difficult problem, adopt traditional mode can't penetrate the macadam of backfill certainly,, can't guarantee that also rotary churning pile finishes smoothly even adopted geological drilling rig or prospecting rig with Guan Yinkong, further, the bulk cobble does not cave in after injecting mud or cement paste or calcium plaster with after managing pore-forming, can't guaranteeing the pore-forming tube drawing yet, simultaneously inefficiency, with high costs, the place is also restricted.

Patent of the present invention " adopting heavy hammer-tamping compaction soil preformed hole method " has been adopted in design, with the H-30 percussive drill with the pipe pore-forming, behind the pore-forming toward the limit compacting of banketing of hole inner edge, segmentation compacting segmentation tube drawing, treat to have formed after homogeneous tube is extracted one " rammed-soil pile ", implement " jump and beat " technology, jet drill rig is in place afterwards, the follow-up of churning limit, limit, after reaching projected depth, rise on the limit gunite limit again, form the churning concrete stake, reached the purpose that the soil that will loose bankets and reinforces.Its excess-three side comes off because of inter-pile soil, and seepage is washed away in addition, has formed many cavities between stake, and same the employing is somebody's turn to do " adopting heavy hammer-tamping compaction soil preformed hole method ", and XianCheng's " rammed-soil pile " carries out high pressure jet grouting, filling cavity with the high-pressure rotary-spray rig then.

Embodiment 2:

10m deep foundation ditch of construction on the sandy beach, beach, Qinhuangdao, the thick 20m of sand bed wherein, and communicate cloth decompression precipitation well in the hole with ocean water.The pile-anchor retaining scheme of inserting the reinforcing cage pile behind the long spiral pore-forming guncreting has been adopted in the slope protection pile design, does the high-pressure rotary-spray pile water stopping curtain between stake, and this " adopting heavy hammer-tamping compaction soil preformed hole method " patented technology has been adopted in design, has finished the construction of rotary churning pile.

Embodiment 3:

Beijing viaduct after having used 3 years wherein two bridge pier sedimentations reach 34mm, it is investigated that the same with other bridge piers each 4 of this two pier foundations stake design is 32m and grows, only reach 25m and 29.5m respectively but hold back resistance during practice of construction.Designing institute requires this two pier is reinforced for this reason, and design has been adopted and executed a 1.5m place at the pier external distance and respectively add two diameter 1.5m, and 40m stake deeply wherein enters cobble 2m.And this bridge below highly has only the operations of all can not entering such as 7m, heavy mechanical equipment such as rotary drilling rig, percussive drill, direct and reverse circulation drilling machine, and manually digging hole underground water is too big, and three layers on sand-pebble layer is arranged again, and personal safety does not have guarantee, can't implement.And can not separate the difficult problem that stake has been executed in never disturbance.Prove repeatedly through the expert, " the heavy tamping compaction soil preexisting hole method " high-pressure rotary jet grouting pile of constructing was somebody's turn to do in use after design adopted small-sized geological drilling rig and SH-30 rig to draw the hole, the first rotary churning pile of in the castinplace pile scope, constructing, form big " cement earth pile ", adopt the construction of manually digging hole method smooth implementation steel concrete perfusion bridge pier afterwards, solved the difficult problem that stake has been executed in not disturbance simultaneously.

Claims

1, a kind of adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method is characterized in that: at first utilize the percussive drill pore-forming, penetrate banket, underground obstacle or quicksand or the bad grounds such as sandy gravel that easily cave in, adopt with pipe bit; When reaching projected depth, sleeve pipe also reaches target depth; In sleeve pipe, fill in soil afterwards, tamping while banketing; After tamping one section, just sleeve pipe is risen and pull out a segment distance, continue to banket and use tamping, treat just to form a rammed-soil pile after whole sleeve pipe is all extracted ground; Jet drill rig is in place afterwards, at this rammed-soil pile place descending revolution high-pressure rotary-spray concrete mud, thereby efficiently finishes jet grouting pile construction smoothly.

2, adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method according to claim 1, it is characterized in that: before with described percussive drill pore-forming, at first measure the fixed stake of unwrapping wire position, percussive drill is in place, adopt with pipe bit and advance to reach projected depth, and determine accurately position of stake, get rid of underground obstacle.

3, adopting heavy hammer-tamping compaction soil preformed hole jet grouting pile construction method according to claim 1, it is characterized in that: described rotary churning pile can realize the consolidated subsoil purpose or form the purpose of water seal curtain, or the purpose of female stake of be used to construct slope protection pile, resistance to plucking anti-floating composite pile or foundation pile.