CN206902721U - A kind of foundation pit supporting system - Google Patents
A kind of foundation pit supporting system Download PDFInfo
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- CN206902721U CN206902721U CN201720870632.2U CN201720870632U CN206902721U CN 206902721 U CN206902721 U CN 206902721U CN 201720870632 U CN201720870632 U CN 201720870632U CN 206902721 U CN206902721 U CN 206902721U
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- pile
- prestressed pipe
- foundation pit
- ground cover
- pit supporting
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Abstract
The utility model discloses a kind of foundation pit supporting system, including pile for prestressed pipe cement soil wall, prestressing force balance anchor pole, ground cover and ribbed stiffener；The pile for prestressed pipe cement soil wall includes pile for prestressed pipe and triaxial cement mixing pile, and the pile for prestressed pipe is inserted in triaxial cement mixing pile；Connection is consolidated between the pile for prestressed pipe cement soil wall and ground cover；The ribbed stiffener is arranged on the boundary corner of pile for prestressed pipe cement soil wall and ground cover；In hard soil layer, its other end is worn to be fixed on ground cover the end anchorage of the prestressing force balance anchor pole；The utility model is simple in construction, easy to operate, safe and reliable, cost is cheap, and especially suitable construction space is narrow, urban central zone pattern foundation pit supporting structures close to existing buildings or structures, and practicality is very strong.
Description
Technical field
The pattern foundation pit supporting structure field that the utility model belongs in Geotechnical Engineering, and in particular to a kind of foundation pit supporting system, especially
It is related to a kind of foundation pit supporting system in narrow place.
Background technology
Improved as Chinese Urbanization is horizontal, the underground space is extensively efficiently using being used as solution urban population, resource, environment
Three big crises and the important channel for implementing urban sustainable development.Due to the limitation of town site, surrounding enviroment it is tight
High property and base pit engineering complexity and uncertainty, base pit engineering involved during excavating and going along with sb. to guard him the problem of are still
One extremely challenging, excessive risk, highly difficult problem.
In building foundation pit supporting design, flexible support and rigid protection common are.Flexible support includes plate brad supporting, hanged
The board-like supporting of arm, rigid protection is generally by enclosure wall, water seal curtain, horizontal inner support system (or anchor rod system) and support
Vertical supporting system forms.The species of enclosure wall is more, including diaphram wall, perfusion campshed enclosure wall, shaped steel soil cement stir
Mix wall, steel sheet pile enclosure wall and reinforced concrete sheet pile enclosure wall etc.；Traditional enclosure wall is typically perpendicular to the ground, and construction is compared
It is convenient, but so suffered soil pressure is maximum, and bored concrete pile belongs to non-prestressed present walling pile, and this pile quality is not allowed easily-controllable
System, bearing capacity of pile are low, it is not easy to give full play to the intensity of stake itself；
The inner support of enclosure wall combination inner support system can use bracing members or reinforced concrete support, in foundation ditch area not
When big, its Technical Economy is preferable, but when foundation ditch area reaches certain scale, due to that need to set and remove substantial amounts of interim branch
Support, thus it is economical poor, while main structure construction inconvenience in foundation ditch is easily caused using inner support, and to branch during dismounting
The destruction of shield, the construction site in general city is narrow, and foundation ditch is nearer away from existing buildings or structures, therefore can not in pattern foundation pit supporting structure
Traditional wide-angle tilt anchor pole is set, and sets wide-angle tilt anchor pole to can easily exceed construction red line；In addition, supporter
System remove when enclosure wall secondary deformation can occur, tear open support explosion and tear open support after discard broken concrete environment can all be produced
Adverse effect.
Utility model content
The technical problems to be solved in the utility model is：A kind of foundation pit supporting system is provided, to solve above-mentioned background technology
The problem of middle.
The technical scheme that the utility model solves technical problem is as follows：
A kind of foundation pit supporting system of the utility model, is characterized in：Balanced including pile for prestressed pipe cement soil wall, prestressing force
Anchor pole, ground cover and ribbed stiffener；The pile for prestressed pipe cement soil wall includes pile for prestressed pipe and triaxial cement mixing pile,
The pile for prestressed pipe is inserted in triaxial cement mixing pile；The company of consolidation between the pile for prestressed pipe cement soil wall and ground cover
Connect；The ribbed stiffener is arranged on the boundary corner of pile for prestressed pipe cement soil wall and ground cover；The prestressing force balance anchor
In hard soil layer, its other end is worn to be fixed on ground cover the end anchorage of bar.
Further, for described pile for prestressed pipe cement soil wall to face upward inclined, it faces upward oblique angle ≯ 15 °.
Further, described ribbed stiffener is reinforced concrete structure.
Further, described ribbed stiffener is arranged on below ground cover or more than ground cover.
Further, the range of tilt angles of described prestressing force balance anchor pole is ≯ 45 °.
Further, described prestressing force balance anchor pole steel strand wires or churning anchor tube substitute.
Relative to prior art, the utility model enclosure wall is pile for prestressed pipe soil cement composite wall, and pile for prestressed pipe has
There are higher tension, compression strength, and with after cement mixing method combination, horizontal shear strength also greatly improves, such nothing
Doubt the shortcomings that overcoming pile for prestressed pipe, played its advantage, and building enclosure it is appropriate face upward tiltedly after, soil can be significantly reduced
Pressure, the shear stress that pile for prestressed pipe is subject to further is reduced, improve overall security；In addition, the utility model enclosure wall knot
Structure, beneficial to the rapid construction in scene, the outer row's mud amount in scene is substantially less than normal, is advantageous to construct in urban district；The utility model is set
Prestressing force balance anchor pole angle can be adjusted according to actual conditions, it may be necessary to be vertically arranged, save space.Initial
Fastening force make it that prestressing force balances anchor pole tension, enclosure wall by towards the moment of flexure on the outside of foundation ditch, on the inside of the foundation ditch of enclosure wall by
Draw, moment of flexure caused by this soil mass of foundation pit being subject to enclosure wall can improve enclosure wall stress so that go along with sb. to guard him with partial equilibrium
The strength of materials of wall can play to a high degree.This support system belongs to overall application of the prestressing force in pattern foundation pit supporting structure, system by
Power clearly, it is cost economy, easy for construction, safe and reliable.
Foundation pit supporting system described in the utility model is suitable for narrow field construction, but is not limited only to narrow place,
It can be used for the pattern foundation pit supporting structure in other places.
Brief description of the drawings
Fig. 1 is the structural representation of foundation pit supporting system facade described in the utility model.
Fig. 2 is the structural representation of foundation pit supporting system plane described in the utility model.
In figure：1. triaxial cement mixing pile, 2. pile for prestressed pipe, 3. ground covers, 4. prestressing force balance anchor pole, 5. are led
Groove, 6. pile for prestressed pipe cement soil walls, 7. ribbed stiffeners.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
As depicted in figs. 1 and 2, a kind of foundation pit supporting system of the utility model, including it is pile for prestressed pipe cement soil wall 6, pre-
Stress equilibrium anchor pole 4, ground cover 3 and ribbed stiffener 7；The pile for prestressed pipe cement soil wall 6 includes the axle of pile for prestressed pipe 2 and three
Cement mixing method 1, the pile for prestressed pipe 2 are inserted in triaxial cement mixing pile 1；The pile for prestressed pipe cement soil wall 6 with
Connection is consolidated between ground cover 3；The boundary that the ribbed stiffener 7 is arranged on pile for prestressed pipe cement soil wall 6 and ground cover 3 turns
At angle；In hard soil layer, its other end is worn to be fixed on ground cover 3 end anchorage of the prestressing force balance anchor pole 4.
Pile for prestressed pipe cement soil wall 6 described in the present embodiment is faces upward inclined, and it faces upward oblique angle ≯ 15 °, i.e., it faces upward oblique angle not
More than 15 degree, its specific dip angle base area the factor such as size, geological conditions and surrounding environment determine.
Ribbed stiffener 7 described in the present embodiment is reinforced concrete structure, the ribbed stiffener 7 can be arranged on ground cover 3 with
Under, ground cover more than 3 can also be arranged on.
Angle of inclination ≯ 45 ° of prestressing force balance anchor pole 4 described in the present embodiment, i.e. its angle of inclination are not more than 45 degree,
Generally, the angle of inclination is smaller, and in especially narrow field construction, prestressing force balance anchor pole 4 if necessary can be with
It is vertically arranged with foundation ditch ground.
Prestressing force balance anchor pole 4 described in the present embodiment can use steel strand wires or churning anchor tube to substitute, with steel strand wires or rotation
Spray anchor tube can reach the equal effect of prestressing force balance anchor pole 4.
As shown in figure 1, the length of ground cover described in the present embodiment could be arranged to formula H/2tan (45+ φ/2) institute
Evaluation, H be foundation depth in formula, and φ is soil body weighting internal friction angle in foundation ditch, with the formula income value with for floor lid
The length of plate 3 can cause the coverage to foundation pit supporting system of 3 outer additional load of ground cover, control in foundation ditch height
Less than half.
During using the utility model, before construction, ensure the three supplies and one leveling in place, i.e. connecting to water and electric power supplies and roads and field first
Ground is smooth, it is ensured that electricity consumption, water safety.The construction technology of the foundation pit supporting system is followed successively by：Well-points dewatering, surveying setting-out, open
Dig guide groove 5, triaxial cement mixing pile machine constructs, inserts pile for prestressed pipe 2, pours ground cover 3, prestressing force balance anchor in place
The hole position of bar 4 determines, pore-forming simultaneously borehole cleaning, slip casting, comprises the following steps that：
A. well-points dewatering；Precipitation is carried out to the well point of foundation ditch in earth excavation the last fortnight or so the time, treats underground water potential drop
Earth excavation is as little as carried out after construction requirement, level of ground water is typically reduced to 0.5m~0.8m below foundation ditch；
B. surveying setting-out；The coordinate basis point provided according to designing unit, setting-out and height are carried out according to design drawing
Journey pilot measurement works, and carries out permanent mark and temporary sign；
C. guide groove 5 is excavated；Excavate guide groove 5 and reach construction requirement, the width of the guide groove 5 is according to pile for prestressed pipe soil cement
The thickness exactness of wall (6), its depth are 1m, the important role of the guide groove 5, have both played a part of tentatively being oriented to, and are storage again
Encircle the needs of slurry；
D. triaxial cement mixing pile machine is constructed in place；Carried out by the way of tri-axial deep stirring pile machine is by one hole of socket
The construction of triaxial cement mixing pile 1, i.e., after first stirring construction first pass (being commonly called as " significantly ") along the hole of barricade direction interval one, tightly
Then " significantly " construction spacer holes bit position in a hole continues to construct for socket, and makes and inclining according to the angle requirement in design drawing
Tiltedly；
E. pile for prestressed pipe 2 is inserted；After triaxial cement mixing pile 1 is constructed, by pile for prestressed pipe 2 in cement initial set
Preceding insertion, the pile for prestressed pipe 2 should keep identical angle of inclination with triaxial cement mixing pile 1, be collectively forming prestressed pipe
Stake cement soil wall 6；
F., ribbed stiffener 7 is set；After the construction of pile for prestressed pipe cement soil wall 6 terminates, to reduce the load of corner,
According to design requirement, ribbed stiffener 7 is poured；
G. ground cover 3 is poured；After the completion of the construction of ribbed stiffener 7, ground cover 3 is poured, the reinforcing bar of the ground cover 3 should
It is anchored in pile for prestressed pipe cement soil wall 6, and is connected with ribbed stiffener 7 so that ground cover 3 and pile for prestressed pipe cement soil wall
6 consolidation connections, while moment of flexure can be transmitted in building enclosure stress, and act on enclosure wall；
H. the hole position of prestressing force balance anchor pole 4 determines；Go out the hole position of prestressing force balance anchor pole 4 using total powerstation setting-out, and
It is marked and numbers on ground cover 3；
I. pore-forming and borehole cleaning；Row drilling is crept into using pore-forming anchor pole, bore diameter, position, depth etc. should meet that design will
Ask, and after pore-forming reaches projected depth, emptied using water under high pressure, sediment in evacuation aperture, until aperture return out it is more clean
Untill water without a large amount of sediments；
J. slip casting；The prestressing force made balance anchor pole 4 is transferred to pore-forming, ensures that prestressing force balances anchor pole 4 in hole
In it is placed in the middle, must not keep to the side, prestressing force then is balanced into the end of anchor pole 4 transfers to away from bottom hole about 0.5m or so, and this is pre- for general warranty
Then the end of stress equilibrium anchor pole 4 carries out slip casting, after the completion of slip casting, using height away from bottom hole 0.4m~0.6m with grouting pump
Strength bolt or OVM anchorages, prestressing force is balanced into the upper end of anchor pole 4 and is fixed on ground cover 3, treats that slurry intensity reaches design requirement
When, anchor pole 4 can be balanced to prestressing force and carry out tensioning operation.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Part is not described in detail for the utility model, is the known technology of those skilled in the art of the present technique.
Claims (6)
- A kind of 1. foundation pit supporting system, it is characterised in that：Including pile for prestressed pipe cement soil wall (6), prestressing force balance anchor pole (4), ground cover (3) and ribbed stiffener (7)；The pile for prestressed pipe cement soil wall (6) includes pile for prestressed pipe (2) and three axle water Soil mixing pile (1), the pile for prestressed pipe (2) are inserted in triaxial cement mixing pile (1)；The pile for prestressed pipe cement soil wall (6) connection is consolidated between ground cover (3)；The ribbed stiffener (7) is arranged on pile for prestressed pipe cement soil wall (6) and ground cover The boundary corner of plate (3)；In hard soil layer, its other end wears solid the end anchorage of the prestressing force balance anchor pole (4) Due on ground cover (3).
- A kind of 2. foundation pit supporting system according to claim 1, it is characterised in that：Described pile for prestressed pipe cement soil wall (6) to face upward inclined, it faces upward oblique angle ≯ 15 °.
- A kind of 3. foundation pit supporting system according to claim 1, it is characterised in that：Described ribbed stiffener (7) mixes for reinforcing bar Xtah Crude Clay structure.
- A kind of 4. foundation pit supporting system according to claim 1, it is characterised in that：Described ribbed stiffener (7) is arranged on ground Surface cover (3) is below or more than ground cover (3).
- A kind of 5. foundation pit supporting system according to claim 1, it is characterised in that：Described prestressing force balance anchor pole (4) Angle of inclination ≯ 45 °.
- A kind of 6. foundation pit supporting system according to claim 1, it is characterised in that：Described prestressing force balance anchor pole (4) Substituted with steel strand wires or churning anchor tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720870632.2U CN206902721U (en) | 2017-07-18 | 2017-07-18 | A kind of foundation pit supporting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720870632.2U CN206902721U (en) | 2017-07-18 | 2017-07-18 | A kind of foundation pit supporting system |
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| Publication Number | Publication Date |
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| CN206902721U true CN206902721U (en) | 2018-01-19 |
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| CN201720870632.2U Active CN206902721U (en) | 2017-07-18 | 2017-07-18 | A kind of foundation pit supporting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165173A (en) * | 2017-07-18 | 2017-09-15 | 中冶华天南京工程技术有限公司 | A kind of foundation pit supporting system and its construction method |
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2017
- 2017-07-18 CN CN201720870632.2U patent/CN206902721U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165173A (en) * | 2017-07-18 | 2017-09-15 | 中冶华天南京工程技术有限公司 | A kind of foundation pit supporting system and its construction method |
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