CN104060615A - Construction method utilizing newly-built supporting structure of foundation pit to eliminate underground obstacle - Google Patents
Construction method utilizing newly-built supporting structure of foundation pit to eliminate underground obstacle Download PDFInfo
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- CN104060615A CN104060615A CN201410247776.3A CN201410247776A CN104060615A CN 104060615 A CN104060615 A CN 104060615A CN 201410247776 A CN201410247776 A CN 201410247776A CN 104060615 A CN104060615 A CN 104060615A
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Abstract
The invention discloses a construction method utilizing a newly-built supporting structure of foundation pit to eliminate an underground obstacle. The method comprises the following steps: step one, confirming the particular position of an underground obstacle and the positions of a plurality of upright post poles to be constructed; leveling ground in an obstacle clearing area; placing concrete floor; step two, conducting construction on the upright post poles; step three, conducting construction on a first concrete support of the foundation pit; step four, removing the underground obstacle until undisturbed soil is exposed; backfilling soil to the level that 100 mm under the project level of the bottom of second concrete support; step five, conducting construction on the second concrete support; step six, adopting a high pressure rotary jet pile machine to conduct construction on reinforcement of pit bottom; step seven, digging a precipitation well to conduct precipitation of the foundation pit; step eight, continuously conducting excavating construction on the foundation pit. The construction method enables the obstacle clearing in the pit and excavation of the foundation pit to conduct synchronously, and not only shortens the construction period, but also reduces the construction cost.
Description
Technical field
The present invention relates to remove in a kind of construction work the construction method of underground obstacle, be particularly related to a kind of in architectural engineering pit excavation construction process, utilize the supporting and protection structure of newly-built design of foundation pit as support system, remove the construction method of the original underground large obstacle in hole.
Background technology
Along with the development of urban construction; the exploitation of Reforming Center Urban Area and the underground space; often be faced with surrounding enviroment complexity, protection and require the difficult problems such as high, narrow field, underground obstacle are many, original building is retained in underground foundation becomes the obstacle before new building construction.Conventionally need first the underground obstacle in place to be removed obstacles.
Owing to being in area, down town, need to carry out construction pit for the removing of underground large obstacle goes along with sb. to guard him, prevent slope failure, backfill again after obstruction removing, dismounting construction pit is gone along with sb. to guard him, smooth location, the engineering pile of the new building of then constructing and bracing of foundation pit stake, finally ability excavation pit, construction underground structure.In this process, can need to do bracing of foundation pit twice, after removing obstacles, backfilling of earthwork excavates again, makes time duration long, forms the waste on definite meaning.
Summary of the invention
For addressing the above problem, the invention provides a kind of construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle, remove obstacles and excavate one-time-reach-place, avoid conventional construction method backfill after removing obstacles, go along with sb. to guard him again, excavate caused waste, reduce the duration, reduce cost.
For achieving the above object, the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle of the present invention, comprises the following steps:
Step 1, determines the particular location of underground obstacle and the position of the some root post stakes that need to construct, at the region smooth location of removing obstacles, builds at least thick concrete floor of 150mm;
Step 2, construction stand column pile;
Step 3, adopts pick machine to abolish concrete floor and underground obstacle more than design elevation at the bottom of first concrete support, the first concrete support of construction foundation pit;
Step 4, removes underground obstacle, until expose undisturbed soil, backfill is to 100mm under design elevation at the bottom of second concrete support;
Step 5, construction second concrete support;
Step 6, adopts jet grouting pile driving machine, and the construction end, hole reinforces;
Step 7, the construction end, hole, has reinforced rear complement dewatering well, carries out foundation pit dewatering.
Step 8, foundation ditch continues excavation construction.
In described step 1, the original engineering pile of underground obstacle position is avoided in the position of stand column pile 6, ensures at least 500mm of clear distance.
First concrete support in described step 3 wouldn't be constructed at the trestle plate in the region of removing obstacles, construction bridge plate again after the end, construction hole in step 6 has reinforced.
On first concrete support in described step 3, have at least a hole to reach 6m × 8m, can make pick machine pass through smoothly.
In described step 4, remove in the process of underground obstacle, if underground obstacle 2 has pile foundation, remove underground obstacle and to the operation in backfill process be: remove obstacles and expose old stake top → measure stake position → detection of pier foundation → backfill to 100mm under design elevation at the bottom of second concrete support.
In described step 4, remove in the process of underground obstacle, being divided into some sections along the order of removing obstacles constructs, every section width is not more than 15m, first remove the superstructure of underground obstacle, on first concrete support, lay again steel guidance tape, pick machine is removed underground obstacle on steel guidance tape, and the area of the underground space reaches after 200m2, and a pick machine enters the bottom removing underground obstacle of first concrete support.
The construction end, hole of second concrete support and the step 6 of constructing in described step 5, reinforces a point section and carries out, after the second concrete support of one of them section has been constructed, on first concrete support, jet grouting pile driving machine is set, the construction end, hole of carrying out this section, reinforces.
Effect of the present invention is: the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle of the present invention, make to remove obstacles and synchronize and carry out with excavation of foundation pit in hole, in the work progress of whole underground construction, do not take separately the duration, than conventional construction method few the operations such as region supporting, backfill, excavation of removing obstacles, reduce backfill, also the workload that has just reduced the reinforcing of the end, hole, has therefore not only reduced the duration, also reduces construction costs.And to have reduced the duration be exactly to have shortened the time that foundation ditch exposes, can control preferably bracing of foundation pit distortion, reduce to greatest extent the impact on environment.
Brief description of the drawings
Fig. 1 is the schematic diagram that adopts full circle swinging obstacle cleaning machine targeted elimination stand column pile position underground obstacle;
Fig. 2 is the schematic diagram that adopts bored concrete pile machine construction stand column pile;
Fig. 3 adopts pick machine to abolish more than first concrete support design end absolute altitude sclerosis terrace and the schematic diagram of obstruction;
Fig. 4 is the schematic diagram of construction first concrete support;
Fig. 5 is the top view of Fig. 4;
Fig. 6 is the schematic diagram that adopts pick crusher machine underground obstacle;
Fig. 7 is the schematic diagram of construction second concrete support;
Fig. 8 is the schematic diagram that adopts the end reinforcing of jet grouting pile driving machine construction hole;
Fig. 9 is the remove obstacles schematic diagram of trestle plate in region of construction;
Figure 10 is the top view after the construction of trestle plate in Fig. 9.
Detailed description of the invention
Referring to Fig. 1～10, the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle of the present invention, step is as follows:
Step 1, determines the particular location of underground obstacle and the position of the some root post stakes 6 that need to construct, at the region smooth location of removing obstacles, builds at least thick concrete floor 20 of 150mm.By measuring unwrapping wire, determine the particular location and the position that needs some root post stakes 6 of constructing of underground obstacle, stand column pile 6 tops are lattice steel column, insert in castinplace pile at the end, hole.The underground obstacle here refers to original building basement.And the original engineering pile of underground obstacle (claiming again old pile foundation) position is avoided, at least 500mm of guarantee clear distance in the position that makes stand column pile 6.Construction stand column pile 6 need to be passed underground obstacle 2 top boards and base plate, and inner building waste.Stand column pile 6 positions adopt RTP-350E full circle swinging obstacle cleaning machines 21 to remove to 500mm under underground obstacle 2 bottoms, aperture 1000mm, more than the large 100mm of aperture ratio castinplace pile diameter, adopt full circle swinging obstacle cleaning machine 21 targeted elimination stand column pile 6 position underground obstacles 2 as shown in Figure 1.Construction process: stand column pile location → obstacle cleaning machine is in place → hanging device is in place → sleeve pipe convolution is pressed into → circle round in eccentric cutting → groove and draws water, clear soil → full section circles round cut-out → handling obstruction → hole in backfill cement-soil → densification → telephone-moving carry out next hole removing.
Step 2, adopts bored concrete pile machine 22 stand column pile 6 of constructing, as shown in Figure 2, and castinplace pile diameter 850mm.The position of removing obstacles arranges the steel sleeve of full circle swinging obstacle cleaning machine 21, prevents from that underground water from entering in bored pile hole to cause that slurry coat method denseness declines, and causes hole wall collapse.
Step 3, adopts PC220 type to excavate pick machine 8 and abolishes more than 1 end of first concrete support absolute altitude concrete floor 20 and indoor wall 3, the exterior wall 4 of underground obstacle 2, and the first concrete support 1 of construction foundation pit, as shown in Fig. 3, Fig. 4 and Fig. 5.The trestle plate 12 in the non-region of removing obstacles on first concrete support 1 can first be constructed, and the trestle plate 13 in the region of removing obstacles wouldn't be constructed, and joint (reserved constuction joint) is located reserved straight screw sleeve, for the remove obstacles connection of trestle plate 13 in region of construction in later period.The hole of removing obstacles between the support of region needs to optimize, and ensureing has a hole to reach 6m × 8m on first concrete support 1, can make pick machine 10 pass through smoothly, sails the end, hole into.
Step 4, removes underground obstacle, as shown in Figure 6.Adopt 8 fragmentations of pick machine since a vertex angle part.In underground obstacle reset procedure, preferably, observe excavation based on space, take reasonable partitioned mode, be conducive to accelerate the speed of removing obstacles, as shown in Figure 5, the region of removing obstacles can be divided into some sections, shown in figure, be 3 sections, as 1st district in Fig. 5,2nd district, 3rd district, every section width is not more than 15m.First remove the superstructure of underground obstacle 2, on first concrete support 1, lay again steel guidance tape 9, pick machine 8 is removed underground obstacle 2 on steel guidance tape 9, the area of the underground space reaches after 200 ㎡, a pick machine 10 enters the hole end (being the bottom of first concrete support 1) and removes underground obstacle 2, until expose undisturbed soil.If underground obstacle 2 has pile foundation, can cut the earth afterwards time, remove with pick machine again.For the construct impact of the old pile foundation of not removed of the high-pressure rotary jet grouting pile after ensureing to remove obstacles and piling, or need to utilize the old pile foundation under underground obstacle 2, the operation of removing obstacles in backfilling process is: remove obstacles and expose old stake top → measure stake position → detection of pier foundation → backfill to 100mm under design elevation at the bottom of second concrete support.
Step 5, construction second concrete support 7.In step 4, will remove obstacles region when being divided into some sections and constructing, until a region wherein complete can be in backfill after removing obstacles formwork, the second concrete support 7 in this region of constructing, as shown in Figure 7.When part second concrete support 7 completes, the pick machine 8 on first concrete support 1 continues broken underground obstacle 2, and in hole, pick machine 10 is broken below, and so closely broken effect is than large in effect of pick machine 8.
Step 6, adopts jet grouting pile driving machine 11, and the construction end, hole reinforces.After the second concrete support 7 in this region has been constructed, jet grouting pile driving machine 11 is set on first concrete support 1, the construction end, hole, reinforces, as shown in Figure 8.The construction end, hole, reinforces and can carry out with removing obstacles of other regions simultaneously.After second concrete support 7 has all been constructed, in the backfill 23 of compacting in foundation ditch, the plank 24 of laying depth 50mm is set up framed bent 24 on plank 24, the constructed residual remaining trestle plate 13 in region of removing obstacles, as shown in Figures 9 and 10.Because trestle plate 13 is shelved on the beam of first concrete support 1, bottom framed bent 24 can be removed after concrete strength reaches C20.But the trestle plate 13 newly watering, can not load-bearing not reaching before design strength.
Step 7, the construction end, hole, has reinforced rear complement dewatering well, carries out foundation pit dewatering.
Step 8, foundation ditch continues excavation construction.Foundation ditch continues excavation construction, carries out follow-up construction according to conventional construction method.
Those skilled in the art will recognize that; above-mentioned detailed description of the invention is exemplary; in order to make those skilled in the art can better understand this patent content; should not be understood as the restriction to this patent protection domain; change or modify as long as disclose spiritual any being equal to of doing according to this patent, all fall into this patent protection domain.
Claims (7)
1. utilize newly-built foundation pit supporting construction to remove a construction method for underground obstacle, it is characterized in that, comprise the following steps:
Step 1, determines the particular location of underground obstacle and the position of the some root post stakes that need to construct, at the region smooth location of removing obstacles, builds at least thick concrete floor of 150mm;
Step 2, construction stand column pile;
Step 3, adopts pick machine to abolish concrete floor and underground obstacle more than design elevation at the bottom of first concrete support, the first concrete support of construction foundation pit;
Step 4, removes underground obstacle, until expose undisturbed soil, backfill is to 100mm under design elevation at the bottom of second concrete support;
Step 5, construction second concrete support;
Step 6, adopts jet grouting pile driving machine, and the construction end, hole reinforces;
Step 7, the construction end, hole, has reinforced rear complement dewatering well, carries out foundation pit dewatering.
Step 8, foundation ditch continues excavation construction.
2. the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle according to claim 1, is characterized in that, in described step 1, the original engineering pile of underground obstacle position is avoided in the position of stand column pile 6, ensures at least 500mm of clear distance.
3. the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle according to claim 1, it is characterized in that, first concrete support in described step 3 wouldn't be constructed at the trestle plate in the region of removing obstacles, construction bridge plate again after the end, construction hole in step 6 has reinforced.
4. the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle according to claim 1, is characterized in that on the first concrete support in described step 3, having at least a hole to reach 6m × 8m, can make pick machine pass through smoothly.
5. the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle according to claim 1, it is characterized in that, in described step 4, remove in the process of underground obstacle, if underground obstacle 2 has pile foundation, remove underground obstacle and to the operation in backfill process be: remove obstacles and expose old stake top → measure stake position → detection of pier foundation → backfill to 100mm under design elevation at the bottom of second concrete support.
6. the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle according to claim 1, it is characterized in that, in described step 4, remove in the process of underground obstacle, being divided into some sections along the order of removing obstacles constructs, every section width is not more than 15m, first remove the superstructure of underground obstacle, on first concrete support, lay again steel guidance tape, pick machine is removed underground obstacle on steel guidance tape, the area of the underground space reaches after 200m2, and a pick machine enters the bottom removing underground obstacle of first concrete support.
7. the construction method of utilizing newly-built foundation pit supporting construction to remove underground obstacle according to claim 6, it is characterized in that, the construction end, hole of second concrete support and the step 6 of constructing in described step 5, reinforces a point section and carries out, after the second concrete support of one of them section has been constructed, on first concrete support, jet grouting pile driving machine is set, the construction end, hole of carrying out this section, reinforces.
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Cited By (8)
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| CN105155516A (en) * | 2015-08-14 | 2015-12-16 | 江苏省华建建设股份有限公司 | Method for constructing cast-in-situ bored pile before comprehensively removing underground barriers |
| CN105735383A (en) * | 2016-03-25 | 2016-07-06 | 上海建工四建集团有限公司 | Partial underground obstacle removing construction method capable of reserving structural system |
| CN109914507A (en) * | 2019-03-18 | 2019-06-21 | 上海市基础工程集团有限公司 | Abolish the device of underground obstacle under the conditions of deep-cutting |
| CN110173274A (en) * | 2019-05-31 | 2019-08-27 | 武汉市武昌市政建设(集团)有限公司 | A kind of head is removed obstacles method |
| CN110952916A (en) * | 2019-11-28 | 2020-04-03 | 武汉金瑞威基础工程有限公司 | Construction method for crushing and dismantling deep part of old building pile foundation |
| CN112538981A (en) * | 2020-11-26 | 2021-03-23 | 上海建工四建集团有限公司 | Old building basement obstacle removing and new building pile foundation synchronous construction method |
| CN113322965A (en) * | 2021-06-11 | 2021-08-31 | 中国建筑第八工程局有限公司 | Deep foundation clearing construction method for near-subway deep foundation pit |
| CN114753381A (en) * | 2022-05-23 | 2022-07-15 | 中铁七局集团郑州工程有限公司 | Method for clearing underground obstacles in non-excavation construction path range in limited space |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105155516A (en) * | 2015-08-14 | 2015-12-16 | 江苏省华建建设股份有限公司 | Method for constructing cast-in-situ bored pile before comprehensively removing underground barriers |
| CN105155516B (en) * | 2015-08-14 | 2016-11-30 | 江苏省华建建设股份有限公司 | The method of construction drill bored concrete pile before making an overall screening underground obstacle |
| CN105735383A (en) * | 2016-03-25 | 2016-07-06 | 上海建工四建集团有限公司 | Partial underground obstacle removing construction method capable of reserving structural system |
| CN109914507A (en) * | 2019-03-18 | 2019-06-21 | 上海市基础工程集团有限公司 | Abolish the device of underground obstacle under the conditions of deep-cutting |
| CN110173274A (en) * | 2019-05-31 | 2019-08-27 | 武汉市武昌市政建设(集团)有限公司 | A kind of head is removed obstacles method |
| CN110952916A (en) * | 2019-11-28 | 2020-04-03 | 武汉金瑞威基础工程有限公司 | Construction method for crushing and dismantling deep part of old building pile foundation |
| CN112538981A (en) * | 2020-11-26 | 2021-03-23 | 上海建工四建集团有限公司 | Old building basement obstacle removing and new building pile foundation synchronous construction method |
| CN113322965A (en) * | 2021-06-11 | 2021-08-31 | 中国建筑第八工程局有限公司 | Deep foundation clearing construction method for near-subway deep foundation pit |
| CN114753381A (en) * | 2022-05-23 | 2022-07-15 | 中铁七局集团郑州工程有限公司 | Method for clearing underground obstacles in non-excavation construction path range in limited space |
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| CN104060615B (en) | 2016-06-15 |
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