CN103485351A - Inclined pile vertical anchor rod supporting structure for foundation pit supporting and construction method thereof - Google Patents
Inclined pile vertical anchor rod supporting structure for foundation pit supporting and construction method thereof Download PDFInfo
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- CN103485351A CN103485351A CN201310456631.XA CN201310456631A CN103485351A CN 103485351 A CN103485351 A CN 103485351A CN 201310456631 A CN201310456631 A CN 201310456631A CN 103485351 A CN103485351 A CN 103485351A
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Abstract
The invention provides an inclined pile vertical anchor rod supporting structure for foundation pit supporting and a construction method thereof. The supporting structure comprises inclined slope protection piles, pile top beams and anchor rods. A row of the inclined slope protection piles are arranged on the edges of a foundation pit, and the bottoms of the inclined slope protection piles extend into the lower soil layer of the bottom of the foundation pit. The supporting structure is characterized in that the anchor rods comprise vertical pre-stress anchor rod bodies arranged in the stable soil layer between every two adjacent inclined slope protection piles and inserted and anchored in the stable soil layer from the ground between every two adjacent inclined slope protection piles, and the pile top beams are in rigid connection with the tops of the inclined slope protection piles and in flexible connection with the upper portions of the vertical pre-stress anchor rod bodies. The supporting structure and the construction method are particularly applied to the adjacent existing building foundation pits with limited underground space, and have the outstanding advantages of supporting the adjacent existing building deep foundation pits, and being good in supporting effect, convenient to construct, simple in working procedure and low in cost.
Description
Technical field
The present invention relates to a kind of building foundation pit supporting system and job practices thereof.
Background technology
In the building foundation pit supporting design and construction, common are the supporting types such as (compound) plate brad supporting, the supporting of stake (wall) anchor, stake (wall) support supporting and the wherein combination of two kinds and two or more supporting types, the pattern foundation pit supporting structure of current most object of construction production adopts above-mentioned supporting type.
In recent years, along with the quickening of urban construction process, in urban district, building sharply increases, building density is more and more high, a lot of buildings are seized every opportunity, other and built very nearby apart from existing building at existing building, so caused problems when taking full advantage of soil:
(1) due to newly-started building foundation pit next-door neighbour existing building, cause the slope support method of new building foundation ditch to be difficult to choose, can not take to put the slope excavation, can not carry out (compound) plate brad supporting again.
(2) if take the measures such as pile-anchor retaining or joist anchor supporting, due to the restriction in soil body space behind slope (because of the restriction on existing building basis, behind slope, soil body width is limited), so the anchor pole angle is larger, supporting effect is poor, and some side slopes anchor pole of at all can't constructing, in such cases, although feasible on employing inner support scheme, cost is higher, operation is numerous and diverse, the construction period is longer, serious to soil excavation and main structure body construction infection.
(3) in recent years, the double-row pile technology has obtained certain development, but the Double-row Piles Support cost is higher, and the pattern foundation pit supporting structure degree of depth also has certain limitation, and the supporting safety factor is lower, and after rear campshed applies and is subject to side slope, ambient influnence is larger.
With regard to present circumstances, see, the pattern foundation pit supporting structure effect of existing next-door neighbour's existing building of having constructed is all not satisfactory, and slope deforming is larger, and this type of foundation ditch accident happens occasionally, particularly the distortion of top, slope.So defect for above-mentioned all kinds supporting and protection structure self, find temporarily next-door neighbour's existing building foundation ditch that can either be limited for the underground space the supporting effect had, the while can have again easy construction, operation is simple and cost is low New Supporting pattern concurrently.
Summary of the invention
The purpose of this invention is to provide that a kind of easy to operate, operation is simple, cost is lower and have the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure and the job practices thereof of better supporting effect, solve that the support system supporting effect be applied in the limited next-door neighbour's existing building foundation ditch of the underground space is poor, loaded down with trivial details, the complex procedures of constructing and the high technical problem of cost.
For achieving the above object, the present invention adopts following technical scheme: the vertical bolt support structure of a kind of taper pile for pattern foundation pit supporting structure, include oblique slope protection pile, stake apical cap beam and anchor pole, described oblique slope protection pile is provided with a row at the margin of foundation pit place, and tiltedly the bottom of slope protection pile is stretched under substrate in soil layer, it is characterized in that: described anchor pole includes the vertical prestressing anchor pole, the vertical prestressing anchor pole is arranged in the steady soil between adjacent two oblique slope protection pile, and the ground of vertical prestressing anchor pole between adjacent two oblique slope protection pile inserts and is anchored in steady soil, described stake apical cap beam is rigidly connected with the top of oblique slope protection pile, and the top of stake apical cap beam and vertical prestressing anchor pole flexibly connects simultaneously.
Described vertical prestressing anchor pole and horizontal plane can be the angle of 60 °～90 °.
Described vertical prestressing anchor pole can be steel strand, reinforcing bar or steel tendon.
Can be provided with default pipe fitting on described stake apical cap beam, the top of described vertical prestressing anchor pole flexibly connects with an apical cap beam through default pipe fitting and by anchor head and backing plate.
Described stake apical cap beam can be Cast-in-situ Beam or precast beam.
Described oblique slope protection pile can be the oblique slope protection pile of rectangle or circular tiltedly slope protection pile.
The job practices of the vertical bolt support structure of a kind of above-mentioned taper pile for pattern foundation pit supporting structure is characterized in that step is as follows: step 1, discharge oblique slope protection pile stake site; Step 2, carry out oblique slope protection pile construction; Step 3, construction vertical prestressing anchor pole; Step 4, construction stake apical cap beam, be rigidly connected an apical cap beam and oblique slope protection pile, and an apical cap beam and vertical prestressing anchor pole are flexibly connected; Step 5, after oblique slope protection pile, vertical prestressing anchor pole and a stake apical cap beam reach the design strength of regulation, the vertical prestressing anchor pole is carried out to tensioning fixation; Step 6, excavation pit, and, according to the data of monitoring, optionally the vertical prestressing anchor pole is carried out to follow-up benefit stretch-draw.
When absolute altitude at the bottom of the hole of foundation ditch during lower than existing building substrate absolute altitude, in described step 6, can during to the side slope lower position, optionally lay conventional anchor pole and waist rail at excavation of foundation pit.
Compared with prior art the present invention has following characteristics and beneficial effect: in the steady soil of the present invention between adjacent two oblique slope protection pile, the vertical prestressing anchor pole is set, and the ground of vertical prestressing anchor pole between adjacent two oblique slope protection pile inserts and is anchored in steady soil, the top of vertical prestressing anchor pole is connected with stake apical cap beam simultaneously, bottom anchors in steady soil, at first design can not take the outer underground space of red line fully like this, to construction environment after side slope, require minimum, secondly can take full advantage of the higher anchored force that the deep soil layer provides, optimized whole supporting and protection structure, so be not only applicable to conventional foundation ditch, also be applicable to next-door neighbour's existing building foundation ditch that common pile-anchor supporting system can't be applied simultaneously.
The present invention is a kind of for the oblique slope protection pile that is close to existing building+vertical bolt support structural shape, be particularly useful for the limited next-door neighbour's existing building foundation ditch of the underground space, it has obvious advantage in next-door neighbour's existing building deep foundation pit support, not only supporting effect is good, and there is easy construction, simple, the lower-cost advantage of operation, certainly, the present invention also has supporting effect preferably in conventional foundation pit stope support.
The present invention can effectively reduce top, slope distortion (distortion of stake top), can implement axial prestress to oblique slope protection pile, and tiltedly the increase of the axial prestress of slope protection pile can improve the Lateral Resistance of oblique slope protection pile again, and the present invention has also improved the cantilever height of oblique slope protection pile.So in sum, the present invention has improved the pile body force-bearing situation, therefore under equal conditions, and applicable to darker foundation ditch.
All working procedures of the present invention, all at ground construction, are compared with traditional supporting and protection structure, have avoided the crossed construction in the hole, have shortened the duration, have simplified operation, have improved safety.
The present invention compares with Retaining Structure with Double-row Piles, under the prerequisite that does not affect the foundation ditch safety factor, can simplify working procedure, saves engineering material, reduces construction cost, shortens the construction period.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is facade structures schematic diagram of the present invention.
Fig. 2 is the schematic top plan view of Fig. 1.
Fig. 3 is the plan structure schematic diagram at the connected node place of an apical cap beam and vertical prestressing anchor pole.
Fig. 4 is the facade structures schematic diagram at the connected node place of an apical cap beam and vertical prestressing anchor pole.
Soil layer under ground between the oblique slope protection pile of Reference numeral: 1-, 2-stake apical cap beam, 3-vertical prestressing anchor pole, 4-anchor head, 5-backing plate, the default pipe fitting of 6-, 7-existing building basis, 8-steady soil, the adjacent two oblique slope protection pile of 9-, 10-substrate.
The specific embodiment
Embodiment is referring to shown in Fig. 1-4, and the vertical anchor pole of this taper pile for pattern foundation pit supporting structure (English of the vertical anchor pole of taper pile is inclined pile vertical anchor, is called for short IPVA) supporting and protection structure, include oblique slope protection pile 1, stake apical cap beam 2 and anchor pole.Described oblique slope protection pile 1 is provided with a row at the margin of foundation pit place, and tiltedly the bottom of slope protection pile 1 is stretched under substrate in soil layer 10, and concrete length is determined by design according to the soil layer situation at position of living in.Tiltedly slope protection pile 1 can be the oblique slope protection pile of the oblique slope protection pile of rectangle, circular tiltedly slope protection pile or other abnormity.
Described anchor pole includes vertical prestressing anchor pole 3, and vertical prestressing anchor pole 3 is arranged in the steady soil 8 between adjacent two oblique slope protection pile 1, and the ground 9 of vertical prestressing anchor pole 3 between adjacent two oblique slope protection pile is inserted and is anchored in steady soil 8; Described steady soil 8 is positioned at foundation ditch and existing building basis 7(or red line zone, underground obstacle etc.) between.
Vertical prestressing anchor pole 3 is comprised of anchoring section and free segment, and the length allocation of anchoring section and free segment, prestressed stretch-draw lock value are determined by design; The rod body material of vertical prestressing anchor pole 3 adopts material commonly used, and as steel strand, reinforcing bar and steel tendon etc., the injecting paste material of the anchoring section of vertical prestressing anchor pole 3 is cement paste or other slurries; During 3 construction of vertical prestressing anchor pole, boring is by drilling machine construction or manual pore-forming.Vertical prestressing anchor pole 3 is generally to be the angle of 60 °～90 ° with horizontal plane, and in the present embodiment, vertical prestressing anchor pole 3 is horizontal by the angle of 90 °.
Described stake apical cap beam 2 is rigidly connected with the top of oblique slope protection pile 1, and stake apical cap beam 2 flexibly connects with the top of vertical prestressing anchor pole 3 simultaneously.The top of described oblique slope protection pile 1 (stake top) and main muscle thereof stretch into a height of apical cap beam 2 and meet national sector standard, as 50mm.
Stake apical cap beam 2 is reinforced concrete beams, this stud apical cap beam 2 can be Cast-in-situ Beam, it can be also precast beam, stake apical cap beam 2 is delivered to the anchored force of vertical prestressing anchor pole 3 (square) on oblique slope protection pile on the one hand, on the other hand part anchor pole power is passed to oblique slope protection pile 1, oblique slope protection pile is applied to axial prestress.
In the present embodiment, stake apical cap beam 2 is provided with default pipe fitting 6, and the top of vertical prestressing anchor pole 3 flexibly connects with stake apical cap beam 2 through default pipe fitting 6 and by anchor head 4 and backing plate 5.
In addition, during lower than existing building substrate absolute altitude, for the vertical bolt support structure of the taper pile of pattern foundation pit supporting structure, can also lay conventional anchor pole and waist rail if necessary in the side slope lower position when absolute altitude at the bottom of the hole of foundation ditch.
The job practices of the vertical bolt support structure of the described taper pile for pattern foundation pit supporting structure, its step is as follows.
Step 1, discharge oblique slope protection pile stake site; Step 2, carry out 1 construction of oblique slope protection pile, it is definite that job practices is looked stake type, soil layer situation and surrounding enviroment that design adopts, as manual pore-forming, long spiral, revolve and the job practices such as dig; Step 3, construction vertical prestressing anchor pole 3; Step 4, construction stake apical cap beam 2, be rigidly connected an apical cap beam and oblique slope protection pile 1, and an apical cap beam and vertical prestressing anchor pole 3 are flexibly connected; Step 5, after oblique slope protection pile 1, vertical prestressing anchor pole 3 and a stake apical cap beam 2 reach the design strength of regulation, vertical prestressing anchor pole 3 is carried out to tensioning fixation (utilizing hollow jack to carry out tensioning fixation); Step 6, excavation pit, and, according to the data of monitoring, optionally vertical prestressing anchor pole 3 is carried out to follow-up benefit stretch-draw.
When absolute altitude at the bottom of the hole of foundation ditch during lower than existing building substrate absolute altitude, can also be in step 6, during to the side slope lower position, optionally lay conventional anchor pole and waist rail (specifically being determined by design), to reach better combination supporting effect at excavation of foundation pit.
The described content of this manual embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also reaches conceives the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (8)
1. the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure, include oblique slope protection pile (1), stake apical cap beam (2) and anchor pole, described oblique slope protection pile (1) is provided with a row at the margin of foundation pit place, and tiltedly the bottom of slope protection pile (1) is stretched in soil layer under substrate (10), it is characterized in that:
Described anchor pole includes vertical prestressing anchor pole (3), vertical prestressing anchor pole (3) is arranged in the steady soil (8) between adjacent two oblique slope protection pile (1), and the ground (9) of vertical prestressing anchor pole (3) between adjacent two oblique slope protection pile is inserted and is anchored in steady soil (8);
Described stake apical cap beam (2) is rigidly connected with the top of oblique slope protection pile (1), and stake apical cap beam (2) flexibly connects with the top of vertical prestressing anchor pole (3) simultaneously.
2. the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure according to claim 1 is characterized in that: described vertical prestressing anchor pole (3) is horizontal by the angle of 60 °～90 °.
3. the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure according to claim 1, it is characterized in that: described vertical prestressing anchor pole (3) is steel strand, reinforcing bar or steel tendon.
4. the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure according to claim 1, it is characterized in that: described stake apical cap beam (2) is provided with default pipe fitting (6), and the top of described vertical prestressing anchor pole (3) is through presetting pipe fitting (6), also flexibly connecting with stake apical cap beam (2) by anchor head (4) and backing plate (5).
5. the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure according to claim 1 is characterized in that: described stake apical cap beam (2) is Cast-in-situ Beam or precast beam.
6. the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure according to claim 1 is characterized in that: described oblique slope protection pile (1) is the oblique slope protection pile of rectangle or circular tiltedly slope protection pile.
7. the job practices of the vertical bolt support structure of the described taper pile for pattern foundation pit supporting structure of any one in a claims 1-6 is characterized in that step is as follows:
Step 1, discharge oblique slope protection pile stake site;
Step 2, carry out oblique slope protection pile (1) construction;
Step 3, construction vertical prestressing anchor pole (3);
Step 4, construction stake apical cap beam (2), be rigidly connected an apical cap beam and oblique slope protection pile (1), and an apical cap beam and vertical prestressing anchor pole (3) are flexibly connected;
Step 5, after oblique slope protection pile (1), vertical prestressing anchor pole (3) and a stake apical cap beam (2) reach the design strength of regulation, vertical prestressing anchor pole (3) is carried out to tensioning fixation;
Step 6, excavation pit, and, according to the data of monitoring, optionally the vertical prestressing anchor pole is carried out to follow-up benefit stretch-draw.
8. the job practices of the vertical bolt support structure of the taper pile for pattern foundation pit supporting structure according to claim 7, it is characterized in that: when absolute altitude at the bottom of the hole of foundation ditch during lower than existing building substrate absolute altitude, in described step 6, when excavation of foundation pit arrives the side slope lower position, lay conventional anchor pole and waist rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310456631.XA CN103485351A (en) | 2013-09-30 | 2013-09-30 | Inclined pile vertical anchor rod supporting structure for foundation pit supporting and construction method thereof |
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| CN201310456631.XA CN103485351A (en) | 2013-09-30 | 2013-09-30 | Inclined pile vertical anchor rod supporting structure for foundation pit supporting and construction method thereof |
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Cited By (7)
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| CN105649089A (en) * | 2016-01-13 | 2016-06-08 | 江西博慧工程技术服务有限公司 | Construction method for excavating foundation pit close to existing shallow foundation protection structure |
| CN105986580A (en) * | 2015-04-29 | 2016-10-05 | 孔志坚 | Subway station basement support construction method |
| CN108611961A (en) * | 2018-01-25 | 2018-10-02 | 中铁建设集团有限公司 | It is standardized to have enough to meet the need steel construction driving channel and its construction method |
| CN110130397A (en) * | 2019-05-15 | 2019-08-16 | 天津大学 | Tilt hexagon piping lane system and its construction method of the supporting in conjunction with main structure |
| CN110130399A (en) * | 2019-05-15 | 2019-08-16 | 天津大学 | Tilt trapezoidal piping lane system and its construction method of the supporting in conjunction with main structure |
| CN111648377A (en) * | 2020-06-16 | 2020-09-11 | 深圳市勘察测绘院(集团)有限公司 | Vertical and inclined pile combined foundation pit supporting method |
| CN115198762A (en) * | 2022-07-22 | 2022-10-18 | 中建一局集团第二建筑有限公司 | Supporting structure next to existing building foundation pit and construction method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105986580A (en) * | 2015-04-29 | 2016-10-05 | 孔志坚 | Subway station basement support construction method |
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| CN110130397A (en) * | 2019-05-15 | 2019-08-16 | 天津大学 | Tilt hexagon piping lane system and its construction method of the supporting in conjunction with main structure |
| CN110130399A (en) * | 2019-05-15 | 2019-08-16 | 天津大学 | Tilt trapezoidal piping lane system and its construction method of the supporting in conjunction with main structure |
| CN111648377A (en) * | 2020-06-16 | 2020-09-11 | 深圳市勘察测绘院(集团)有限公司 | Vertical and inclined pile combined foundation pit supporting method |
| CN115198762A (en) * | 2022-07-22 | 2022-10-18 | 中建一局集团第二建筑有限公司 | Supporting structure next to existing building foundation pit and construction method thereof |
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Application publication date: 20140101 |