CN209482313U - Foundation pit supporting construction - Google Patents
Foundation pit supporting construction Download PDFInfo
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- CN209482313U CN209482313U CN201822129389.6U CN201822129389U CN209482313U CN 209482313 U CN209482313 U CN 209482313U CN 201822129389 U CN201822129389 U CN 201822129389U CN 209482313 U CN209482313 U CN 209482313U
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Abstract
The utility model relates to the ultra-deep foundation pit supporting fields of more underground water, and in particular to foundation pit supporting construction, foundation pit inner wall is equipped with support pile, and support pile is at least partly embedded in underground part, and excavation portion is equipped with prestress anchorage cable, and the peripheral soil body of foundation pit is equipped with gully；Prestress anchorage cable includes the fixing end for being fixed on foundation pit inner wall and the end that anchors into for going deep into the soil body, and gully is more than or equal to the distance for anchoring into end to ground close to end setting, the distance on shaft bottom to the ground of gully is anchored into.The utility model realizes the supporting of the higher ultra-deep foundation pit of phreatic line by the supporting construction that support pile, prestress anchorage cable and gully combine, the supporting construction is not take up foundation pit inner space, be conducive to the lesser deep foundation pit construction operation of area of base, and without removing, construction in later period is not influenced, the effect of later period supporting can also be played to foundation pit.
Description
Technical field
The utility model relates to the ultra-deep foundation pit supporting fields of more underground water, in particular to foundation pit supporting construction.
Background technique
Currently, diaphram wall is generally first arranged in ultra-deep foundation pit supporting, then inner support knot is set inside foundation pit
Structure carries out supporting, and the inner supporting structure of this support pattern setting can occupy the inner space of foundation pit, influence construction in later period, sometimes
Setting needs first to remove constructs again, extends construction period, and be unfavorable for the small deep basal pit operation of area of base.
But the ultra-deep foundation pit of more water higher for phreatic line, excavation of foundation pit, drainage construction are more difficult, if not into
Row inner support supporting, it is difficult to guarantee that foundation pit inner wall is stablized.
Utility model content
The utility model embodiment is intended to provide a kind of foundation pit supporting construction, with solve in the prior art phreatic line compared with
The support issues of high ultra-deep foundation pit.
The embodiments of the present invention provide a kind of foundation pit supporting construction, and using bottom of foundation ditch as boundary, the foundation pit includes opening
Digging portion and underground part, foundation pit inner wall are located at excavation portion, and the foundation pit inner wall is equipped with support pile, and the support pile is at least partly embedded
In the underground part, the excavation portion is equipped with prestress anchorage cable, and the peripheral soil body of the foundation pit is equipped with gully；
The prestress anchorage cable includes the fixing end for being fixed on foundation pit inner wall and the end that anchors into for going deep into the soil body, the gully
Close to described anchor into end setting, the distance on shaft bottom to the ground of the gully be more than or equal to it is described anchor into hold to ground away from
From.
The supporting construction of support pile, prestress anchorage cable and gully combination, support pile and prestressing force is arranged in the utility model
Anchor cable carries out supporting to the inner wall of ultra-deep foundation pit, using the soil body of support pile stable foundation pit inner wall in advance, then uses prestressing force
Anchor cable gos deep into inside soil body from foundation pit inner wall, together by the soil body anchoring around the soil body and foundation pit of foundation pit inner wall surface, rises
To the effect of supporting.
Gully is set to the soil body around foundation pit, and gully drains in advance before construction prestressed cable, makes the soil body
Phreatic line anchor into end lower than prestress anchorage cable, reduce the pressure of inside soil body.It prevents in construction prestressed cable mistake
Cheng Zhong, soil particle and water inside foundation pit surrounding soil are depressed inside quickly to be gushed out from anchor hole, causes foundation pit collapse, or avoid
During construction prestressed cable, causes the water sealing structure of foundation pit damaged under the external force of construction and the internal force of the soil body, cause to send out
Raw water sealing structure failure causes soil destruction.
The utility model realizes phreatic line by the supporting construction that support pile, prestress anchorage cable and gully combine
The supporting of higher ultra-deep foundation pit, the supporting construction are not take up foundation pit inner space, are conducive to the lesser deep basal pit of area of base
Construction operation, and without removing, construction in later period is not influenced, the effect of later period supporting can also be played to foundation pit.
In an embodiment of the present invention, optionally, crown beam is set, and the crown beam will be every at the top of the support pile
A support pile is connected as one.It will be connected as one at the top of support pile by setting crown beam, form support pile whole
Support frame reinforces integer support intensity, further prevents the inner wall of foundation pit by lateral pressure deformation failure.
In an embodiment of the present invention, optionally, the prestress anchorage cable is set to the adjacent supporting
The interval position of stake.Prestress anchorage cable is set to the interval position of support pile, and support pile forms surface layer blocking portion, prestress anchorage cable
Deep layer anchoring section is formed, surface layer blocking portion replaces cooperation supporting foundation pit with deep layer anchoring section.
In an embodiment of the present invention, optionally, the peripheral soil body of the foundation pit is additionally provided with water-stop curtain, institute
It states and anchors into end across the water-stop curtain.Water-stop curtain is as the safety stock for preventing foundation pit lateral deformation, for by foundation pit
The peripheral soil body separates, and continually flows to around foundation pit to avoid the water in the soil body of distant place, plays the effect of long-acting sealing.
Water-stop curtain, gully and prestress anchorage cable cooperation are further conducive to the long-acting deep layer anchoring of surrounding soil of foundation pit.
In an embodiment of the present invention, optionally, soil nail wall, the soil nailing are set at the top of the foundation pit inner wall
Wall does slope processing.Have acclive soil nail wall by being arranged at the top of the inner wall of foundation pit, makes inner wall at the top of foundation pit to foundation pit
The whole center of gravity of outer incline, the foundation pit top soil body is moved to outside foundation pit, to reduce the unstable soil body transmitting of foundation pit upper inside wall
The pressure come.
In an embodiment of the present invention, optionally, the excavation portion includes multiple excavation layers, the excavation layer
It is arranged successively from ground to the underground part, the interval position of the support pile is at each excavation layer at least provided with one
The prestress anchorage cable.Multiple excavation layers can be excavated successively, every to excavate one layer of all setting prestress anchorage cable, each excavation layer
Successively apply deep layer anchoring, carry out next layer of excavation after waiting an excavation layer to stablize again, guarantees base pit stability and operation peace
Quan Xing.
In an embodiment of the present invention, optionally, the gully includes drainage well and relief well, described to dredge
Between the foundation pit inner wall and the water-stop curtain, the relief well is located at described anchor into and holds and the water-stop curtain dry-well
Between.By the way that the drainage well and relief well of draining are respectively set in water-stop curtain two sides, wherein drainage well drains water-stop curtain
Underground water between the inner wall of foundation pit reduces seepage through soil mass to facilitate construction prestressed cable, improves working security；Subtract
The underground water of water-stop curtain periphery is drained in kill-job, reduces the pressure of water-stop curtain periphery, prestress anchorage cable is facilitated to go deep into sealing curtain
The anchoring of curtain periphery reduces water-stop curtain in the double of peripheral pressure and drilling anchor during prestress anchorage cable passes through water-stop curtain
The probability that the lower damaged deformation of recast even fails.
In an embodiment of the present invention, optionally, the soil nail wall moves back platform to the periphery of the foundation pit, described
The relief platform that the gradient is less than soil nail wall is formed between the slope foot of soil nail wall and the foundation pit inner wall.By slope foot in soil nail wall with
Relief platform is set between the inner wall of foundation pit, the gradient of the relief platform is further less than the gradient of soil nail wall, by the way that relief platform is arranged
Be further formed pressure buffer area between soil nail wall and foundation pit inner wall, soil body load further to moving outside foundation pit, and
When soil nail wall stress deformation, buffering can be played the role of, avoid the inner wall deformation for directly causing foundation pit.
In an embodiment of the present invention, optionally, the company of each bottom for excavating layer and foundation pit inner wall
Socket part position is equipped with weeper drain.Weeper drain is used to be discharged the ponding of bottom of foundation ditch, and foundation pit inner wall bottom is avoided to soften, and guarantees every
A intensity for excavating layer bottom is not influenced by ponding, enhances the adjacent intensity excavated between layer.
In an embodiment of the present invention, optionally, the soil nail wall surface adhesion has carbon fiber layer, the carbon
Fibrous layer extends to the ground far from foundation pit, to impose pulling force to the soil body on soil nail wall surface, improves the soil stabilization of soil nail wall
Property, avoid the soil body on soil nail wall surface successively to come down as far as possible.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the planar structure schematic diagram of foundation pit provided by the embodiment of the utility model；
Fig. 2 is the planar structure schematic diagram of foundation pit supporting construction provided by the embodiment of the utility model；
Fig. 3 is the schematic view of facade structure of foundation pit supporting construction provided by the embodiment of the utility model；
Fig. 4 is the enlarged drawing of II part in Fig. 2；
Fig. 5 is the enlarged drawing of the part III in Fig. 3；
Fig. 6 is the flow chart of foundation pit supporting method provided by the embodiment of the utility model.
Icon: the ground 010-；020- foundation pit；030- first excavates layer；040- second excavates layer；050- third excavates layer；
060- the 4th excavates layer；100- water-stop curtain；200- soil nail wall；300- relief platform；400- support pile；500- crown beam；600- is pre-
Stress anchor cable；700- drainage well；800- relief well；900- weeper drain.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that if occur term " center ", "upper", "lower", " close ",
The orientation or positional relationship of the instructions such as " separate ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Set relationship or the utility model product using when the orientation or positional relationship usually put, be merely for convenience of description this
Utility model and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore should not be understood as limiting the present invention.If in addition, going out in the description of the utility model
Existing term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
If being not offered as requiring component in addition, occurring the terms such as term "horizontal", "vertical" in the description of the utility model
Abswolute level or pendency, but can be slightly tilted.If "horizontal" only refers to that its direction is more horizontal with respect to for "vertical",
It is not to indicate that the structure is had to fully horizontally, but can be slightly tilted.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, if there is art
Language " setting ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or
It is integrally connected；It can be directly connected, it can also be indirectly connected through an intermediary.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment 1
A kind of 020 supporting construction of foundation pit can construct in draining in the construction process, and supporting construction does not account for after being formed
With 020 inner space of foundation pit, be particularly suitable for ultra-deep, phreatic line is higher, the lesser foundation pit 020 of area of base carries out
Supporting.
Please referring to attached drawing 1 and attached drawing 3, foundation pit 020 includes inner wall and bottom, for ease of description, hereinafter referred to as foundation pit 020
Inner wall is basal wall, 020 bottom of foundation pit is substrate.Foundation pit 020 is using substrate as boundary, including excavation portion and underground part, wherein underground part
Positioned at substrate hereinafter, excavation portion is located at substrate or more, basal wall is located at excavation portion.
Referring to shown in attached drawing 3, wherein excavation portion includes multilayer by ground 010 downwards, and in the present embodiment, excavation portion includes four
A excavation layer.Wherein substrate includes actual base and design substrate, and the first actual base for excavating layer 030 is the first substrate, the
The depth of one substrate is the depth of the first excavation layer 030；Second actual base for excavating layer 040 is the second substrate, the second substrate
Depth be the second excavation layer 040 depth；The actual base that third excavates layer 050 is third substrate, the depth of third substrate
It is the depth that third excavates layer 050；4th actual base for excavating layer 060 is the 4th substrate, and the depth of the 4th substrate is the 4th
Excavate the depth of layer 060.In the present embodiment, the 4th, which excavates layer 060, excavates layer for the last one, therefore the 4th substrate is exactly to design
Substrate.
Attached drawing 2 and attached drawing 3 are please referred to, basal wall is equipped with support pile 400, and support pile 400 at least partly extends simultaneously to underground part
It is embedded in underground part.
Further, crown beam 500 is arranged at the top of support pile 400 for attached drawing 4 and attached drawing 5, and referring to attached drawing 2, crown beam 500 will be every
A support pile 400 is connected as one, and support pile 400 forms whole support frame, reinforces integer support intensity, further
Prevent the inner wall of foundation pit 020 by lateral pressure deformation failure.
Prestress anchorage cable 600 is arranged in the interval position of support pile 400, and prestress anchorage cable 600 includes fixed section and anchors into end,
The soil body that end is entered 020 periphery of foundation pit by basal wall is wherein anchored into, fixing end is fixed on 020 inner wall of foundation pit.It support pile 400 and answers in advance
Power anchor cable 600 carries out supporting to the inner wall of ultra-deep foundation pit 020, stablizes the soil body of 020 inner wall of foundation pit in advance using support pile 400,
Support pile 400 forms surface layer blocking portion, then gos deep into inside soil body, prestressing force from 020 inner wall of foundation pit using prestress anchorage cable 600
Anchor cable 600 forms deep layer anchoring section, and surface layer blocking portion replaces cooperation with deep layer anchoring section, by the soil body of 020 inner wall surface of foundation pit
Together with the soil body anchoring around foundation pit 020, the effect of combination supporting is played.
In order to further ensure construction speed and work progress safety, each interval position of support pile 400 is each
It excavates and a prestress anchorage cable 600 is at least set at layer, so that each excavation layer can maintain stability, a upper excavation respectively
Layer carries out next layer of excavation again after stablizing.Not only guarantee basal wall monolithic stability in design, it is ensured that basal wall is in step excavation mistake
Stabilization is not collapsed in journey.
Further, the prestress anchorage cable 600 being arranged in adjacent two intervals is arranged in a staggered manner, and makes prestress anchorage cable 600
It is arranged in plum blossom-shaped, so that deep soil more uniformly anchors, anchor force is avoided all to be applied to the same depth of the soil body.
The gully for soil body moisture to be discharged is arranged in the peripheral soil body of foundation pit 020, and the depth capacity of gully is greater than real
The depth of border substrate, the distance on shaft bottom to the ground 010 of gully are greater than the distance that prestress anchorage cable 600 arrives ground 010.Draining
Well drains in advance before the construction of prestress anchorage cable 600, makes the phreatic line of the soil body anchoring into lower than prestress anchorage cable 600
End, reduces the pressure of inside soil body.
It is higher that phreatic line is realized by the supporting construction that support pile 400, prestress anchorage cable 600 and gully combine
Ultra-deep foundation pit 020 supporting, which is not take up 020 inner space of foundation pit, is conducive to the lesser deep base of area of base
020 construction operation is cheated, and without removing, does not influence construction in later period, the effect of later period supporting can also be played to foundation pit 020.
Embodiment 2:
On the basis of embodiment 1, further, referring to shown in attached drawing 1 and attached drawing 3, the peripheral soil body of foundation pit 020 is arranged
Soil nail wall 200 is arranged at the top of foundation pit 020 for water-stop curtain 100, and soil nail wall 200 does slope processing, and soil nail wall 200 is to outside foundation pit 020
It encloses and moves back platform, relief platform 300 is set between the slope foot and basal wall of soil nail wall 200, the gradient of relief platform 300 is less than soil nail wall 200
The gradient, in this implementation, relief platform 300 is platform.
Water-stop curtain 100 consolidates the soil body of 020 periphery of foundation pit in advance, forms one of security protection, and foundation pit 020 is peripheral
The soil body separate, i.e., close to the part of basal wall and far from the part of basal wall, what water-stop curtain 100 will be far from the soil body of basal wall is
It separates, to stop the water of distant place constantly to flow to foundation pit 020.
Referring to attached drawing 3 and attached drawing 5, soil nail wall 200 makes the soil body at the top of basal wall to 020 outer incline of foundation pit, at the top of basal wall
The out-shift of gravity center of the soil body, relief platform 300 make center of gravity is further outer to move, reduce the pressure to basal wall.
Also, the soil body is caused to lose when the unstable or peripheral ground 010 of the top soil body of 020 periphery of foundation pit is under pressure
When steady, soil nail wall 200 stress deformation or landslide first, relief platform 300 play the effect of buffering, and deformation, landslide etc. is avoided to destroy
It is directly delivered to basal wall, causes basal wall integrally to destroy and causes safety accident, at least can also constitute safety stock, basal wall is delayed to destroy
Time reduces the probability that large-scale accident occurs, and improves safety.
Referring to attached drawing 3 and attached drawing 5, soil nail wall 200 can also be set to 100 top of water-stop curtain, on soil nail wall 200 is firm
The unstable soil body in portion, the blocking water of water-stop curtain 100, the integral protection of the two formation from top to bottom, reinforcement structure integral strength, more
Water-stop curtain 100 is consolidated well.
Referring to attached drawing 3, the soil body for anchoring into end and protruding into distant place across water-stop curtain 100 of prestress anchorage cable 600.
Referring to attached drawing 4 and attached drawing 5, gully includes drainage well 700 and relief well 800, and drainage well 700 is located at the foundation pit
Between 020 inner wall and the water-stop curtain 100, the relief well 800 be located at it is described anchor into end and the water-stop curtain 100 it
Between.Drainage well 700 drains the underground water between water-stop curtain 100 and the inner wall of foundation pit 020, to facilitate prestress anchorage cable 600 to apply
Work reduces seepage through soil mass, improves working security；Relief well 800 drains the underground water of 100 periphery of water-stop curtain, reduces sealing
The pressure of 100 periphery of curtain facilitates prestress anchorage cable 600 to go deep into 100 periphery anchoring of water-stop curtain, wears in prestress anchorage cable 600
During crossing water-stop curtain 100, reducing water-stop curtain 100, damaged deformation is even under the double action of peripheral pressure and drilling anchor
The probability of failure.
Relief well 800, drainage well 700 can also be used for a long time after the completion of 020 supporting of foundation pit, and pump drainage underground water makes base
The phreatic line height of 020 surrounding soil is cheated in the range of safety.
In the present embodiment, support pile 400 is arranged in basal wall, and water-stop curtain 100, water-stop curtain is arranged in the peripheral soil body of foundation pit 020
Soil nail wall 200,200 slope of soil nail wall is arranged in 100 tops, and is reserved between the slope foot and basal wall of soil nail wall 200 for off-load
With the relief platform 300 of buffering, gully includes drainage well 700 and relief well 800, and wherein drainage well 700 is located at water-stop curtain 100
Close to the side of foundation pit 020, relief well 800 is located at side of the water-stop curtain 100 far from foundation pit 020, specifically, referring to attached drawing 2
With attached drawing 3, drainage well 700 is set at relief platform 300, and relief well 800 is set to 100 periphery of water-stop curtain, prestress anchorage cable
600 fixing end is fixed on basal wall, anchors into end and penetrates the soil body obliquely by basal wall and pass through water-stop curtain 100.Relief well 800
Depth is more than or equal to the distance for anchoring into end to ground 010.
Support pile 400, water-stop curtain 100, drainage well 700, relief well 800 and prestress anchorage cable 600 cooperate, common supporting
The deep basal pit 020 of phreatic high line can either realize that surface layer stops, and can realize in the lesser situation of soil body hydraulic pressure deep
Layer anchoring, and basal wall destroys, the probability of 020 ponding of foundation pit is low, can also be conducive to the long-acting deep layer anchor of surrounding soil of foundation pit 020
Gu.
Embodiment 3:
A kind of 020 method for protecting support of foundation pit is used for supporting basal wall, is particularly suitable for big to phreatic line height, groundwater run off
The supporting of ultra-deep foundation pit 020 be further suitable for that phreatic line is high, groundwater run off is big, ultra-deep, area of base are small
Foundation pit 020 supporting.
020 method for protecting support of foundation pit includes first step and the second step.
First step
Water-stop curtain 100 is set:
There are many forms of water-stop curtain 100, and three axes agitating pile water-stop curtain 100 is used in the present embodiment.Use three axis
Mixing pile machine drills through and is perfused water-seal pile, the closely coupled formation water-stop curtain 100 of water-seal pile, sealing using set driller's skill is repeated
The bottom of curtain 100 is lower than design substrate, and the bottom of water-stop curtain 100 is located at least in substrate impermeable stratum below, that is, stops
The depth of water stake is at least the distance of impermeable stratum to ground 010.
Soil nail wall 200 is set:
Simultaneously slope is excavated at the basal wall edge of design, the anchoring of the anchorages such as soil nailing, anchor pole is set in slopes, in slope surface
Binding is laid with steel mesh, and in slope surface setting cementing layer to stablize slope surface.In the present embodiment, the slope gradient is 1:0.3, specifically
Depending on the gradient is with 200 height of soil nail wall, soil property situation, soil nail wall 200 of being subject to is stablized.Cementing layer can be using injection coagulation
Other glueing materials such as soil or epoxy resin can also be in glueing material surface adhesion carbon fiber for further stable slopes
Dimension.
Carbon fiber layer can extend with to the ground 010, to impose pulling force to the soil body on 200 surface of soil nail wall, improve soil nail wall
200 soil body stability avoids the soil body on 200 surface of soil nail wall from successively coming down as far as possible.
Note that in order to not influence the construction of relief platform 300, it can be mobile to basal wall periphery by 200 slope foot of soil nail wall, that is, it excavates
Position is far from basal wall.
Smooth relief platform 300:
Platform between the slope foot and basal wall of smooth soil nail wall 200, and be compacted.
Excavate drainage well 700:
Drainage well 700 is excavated straight down close to the side of foundation pit 020 in water-stop curtain 100, it is flat from off-load in this implementation
It is excavated vertically downwards at platform, when excavation, layout water can be excavated with side.The depth of drainage well 700 is more than or equal to design base depth.
Excavate relief well 800:
Relief well 800 is excavated straight down in side of the water-stop curtain 100 far from foundation pit 020, and the depth of relief well 800 is big
In the depth for being equal to water-stop curtain 100, and it is lower than the depth for anchoring into end of prestress anchorage cable 600.
Support pile 400 is set:
From 020 sideline of foundation pit, that is, stake holes is drilled through at the position of the basal wall designed, and transfer framework of steel reinforcement, casting concrete,
At the top of support pile 400, setting crown beam 500 is connected together, and optionally, crown beam 500 is along 020 sideline of foundation pit around foundation pit
020 1 circles.
The second step
After the completion of first step, start foundation pit 020 and excavate work, when excavation referring to shown in attached drawing 3, excavates layer by first
030, second excavation layer 040, third excavate layer 050 to the 4th excavate layer 060 stop, successively excavate.It is every to excavate one layer, in base
Prestress anchorage cable 600 is arranged in wall, and weeper drain 900 is arranged in the junction of substrate and basal wall.
Prestress anchorage cable 600 is set:
It first passes through drainage well 700 to walk the underground water pump drainage near foundation pit 020, at least pump drainage to phreatic line is lower than and works as
Then preceding substrate carries out the construction that full-sleeve wet construction pore-forming technique carries out extra long anchor bar with pipe drilling machine using hydraulic；
The underground water pump drainage of the periphery of water-stop curtain 100 soil body is walked by relief well 800 simultaneously, at least pump drainage is to being lower than anchor
Enter the design position at end；
Then, using hydraulic with pipe drilling machine, progress full-sleeve wet construction pore-forming technique continues extra long anchor bar to be applied machinery
Work makes to anchor into hold and fix after water-stop curtain 100.
Further, secondary splitting grouting is carried out after outer tube extraction, filling anchors into the hole after the surrounding soil draining of end
Gap solidifies the soil body nearby, increases the bond stress for anchoring into end and the soil body.
Further, anchor cable axle power can be also monitored, it is ensured that the pulling force moment of anchor cable is within the scope of design requirement.
Weeper drain 900 is set:
Attached drawing 3 is please referred to, one layer of excavation layer of every construction is all arranged in the junction of the basal wall and substrate that currently excavate layer and arranges
Water french drain 900.Attached drawing 1 and attached drawing 2 are please referred to, weeper drain 900 is along 020 sideline of foundation pit around substrate.
Wherein, the weeper drain 900 of excavation layer when not reaching design base depth is temporary drainage french drain 900, is reached
The weeper drain 900 of excavation layer when designing base depth is long-acting weeper drain 900.
As first in the present embodiment is excavated, layer 030, second excavates layer 040, third excavates the weeper drain that layer 050 is arranged
900 dismountings when continuing lower digging only excavate temporary drainage use when layer is constructed as current；And the 4th base of the 4th excavation layer 060
Bottom is design substrate, and the weeper drain 900 that the 4th excavation layer 060 is arranged can be used to drain for a long time.
The sequence of above-mentioned each step can be adjusted flexibly, and be subject to and adapt to condition of construction, in order to shorten the construction period.
For example, please referring to shown in attached drawing 6 in the present embodiment, setting soil nail wall synchronous can be carried out with smooth relief platform, be opened
Dig relief well, excavation drainage well can synchronize progress.
Alternatively, it is also possible that resynchronizing smooth relief platform in the first excavation layer for excavating top, after relief platform is smooth immediately
The draining of drainage well is excavated, until starting to excavate layer first after the phreatic line of the first excavation layer is reduced to the first substrate or less
Basal wall prestress anchorage cable is set, excavate relief well and drain at the same time.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of foundation pit supporting construction, it is characterised in that: using bottom of foundation ditch as boundary, the foundation pit includes excavation portion and underground part,
Foundation pit inner wall is located at excavation portion, and the foundation pit inner wall is equipped with support pile, and the support pile is at least partly embedded in the underground part,
The excavation portion is equipped with prestress anchorage cable, and the peripheral soil body of the foundation pit is equipped with gully；
The prestress anchorage cable includes the fixing end for being fixed on foundation pit inner wall and the end that anchors into for going deep into the soil body, and the gully is close
Described to anchor into end setting, the distance on shaft bottom to the ground of the gully is more than or equal to the distance for anchoring into and holding to ground.
2. foundation pit supporting construction according to claim 1, it is characterised in that: crown beam is set at the top of the support pile, it is described
Each support pile is connected as one by crown beam.
3. foundation pit supporting construction according to claim 1, it is characterised in that: the prestress anchorage cable is set to adjacent institute
State the interval position of support pile.
4. foundation pit supporting construction according to claim 1, it is characterised in that: the peripheral soil body of the foundation pit is additionally provided with sealing
Curtain, the end that anchors into is across the water-stop curtain.
5. foundation pit supporting construction according to claim 1, it is characterised in that: soil nail wall is set at the top of the foundation pit inner wall,
The soil nail wall does slope processing.
6. foundation pit supporting construction according to claim 3, it is characterised in that: the excavation portion includes multiple excavation layers, institute
State excavate layer be arranged successively from ground to the underground part, the interval position of the support pile at each excavation layer at least
Equipped with a prestress anchorage cable.
7. foundation pit supporting construction according to claim 4, it is characterised in that: the gully includes drainage well and decompression
Well, for the drainage well location between the foundation pit inner wall and the water-stop curtain, the relief well anchors into end and institute positioned at described
It states between water-stop curtain.
8. foundation pit supporting construction according to claim 5, it is characterised in that: the soil nail wall is moved back to the periphery of the foundation pit
Platform forms the relief platform that the gradient is less than soil nail wall between the slope foot of the soil nail wall and the foundation pit inner wall.
9. foundation pit supporting construction according to claim 6, it is characterised in that: each bottom for excavating layer and the base
The connecting portion for cheating inner wall is equipped with weeper drain.
10. foundation pit supporting construction according to claim 5, it is characterised in that: the soil nail wall surface adhesion has carbon fiber
Layer, the carbon fiber layer extend to the ground far from foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703874A (en) * | 2022-04-15 | 2022-07-05 | 内蒙古满世煤炭集团点石沟煤炭有限责任公司 | Anti-landslide structure of strip mine refuse dump and construction method thereof |
| CN114775686A (en) * | 2022-05-23 | 2022-07-22 | 中国建筑土木建设有限公司 | Construction method of underpass under highway |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703874A (en) * | 2022-04-15 | 2022-07-05 | 内蒙古满世煤炭集团点石沟煤炭有限责任公司 | Anti-landslide structure of strip mine refuse dump and construction method thereof |
| CN114703874B (en) * | 2022-04-15 | 2024-04-30 | 内蒙古满世煤炭集团点石沟煤炭有限责任公司 | Anti-slip slope structure of strip mine dumping site and construction method thereof |
| CN114775686A (en) * | 2022-05-23 | 2022-07-22 | 中国建筑土木建设有限公司 | Construction method of underpass under highway |
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