CN110206043A - Soil nailing and construction method for supporting - Google Patents
Soil nailing and construction method for supporting Download PDFInfo
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- CN110206043A CN110206043A CN201910529087.4A CN201910529087A CN110206043A CN 110206043 A CN110206043 A CN 110206043A CN 201910529087 A CN201910529087 A CN 201910529087A CN 110206043 A CN110206043 A CN 110206043A
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- soil nailing
- side slope
- soil
- hangnail
- construction
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The application discloses a kind of soil nailing and construction method for supporting, is related to foundation pit construction technical field.Soil nailing includes cylinder and hangnail, and multiple hangnail inclinations are connected to the outer wall of cylinder.Since soil nailing has hangnail, contact area can be increased, prevent soil nailing from moving or sliding out of side slope the soil body, soil nailing and the soil body is set to form a structure entirety by cement injection, give full play to soil body self structure potential strength, change slope deforming and collapse state, significantly improves side slope overall stability.
Description
Technical field
This application involves foundation pit construction technical fields, in particular to a kind of soil nailing and construction method for supporting.
Background technique
Pattern foundation pit supporting structure is the safety to guarantee Underground Construction and foundation pit surrounding environment, to foundation pit side-wall and peripheral ring
Supporting and retaining system, reinforcing and the safeguard measure that border uses.Conventional segmented is divided into excavation pit method to be influenced by geologic(al) factor, is often easily caused
The problems such as pattern foundation pit supporting structure collapses, platform is unstable, side slope compressive resistance is insufficient, sedimentation is uneven.
Summary of the invention
This application provides a kind of soil nailing and construction method for supporting, can enrich in branch sheath internal pore water preservation, soil layer
Under the loose or execution conditions without cementing sandy soil or more closely knit gravel soil or mixed gravelly soil, it effectively prevent hole wall easy
It collapses, enables the smooth pore-forming of armored concrete, to guarantee the stabilization of pattern foundation pit supporting structure.
In a first aspect, providing a kind of soil nailing, soil nailing includes cylinder and hangnail；Multiple hangnail inclinations are connected to cylinder
Outer wall.
Above-mentioned technical proposal can increase the contact area of soil nailing and side slope, prevent soil nailing since soil nailing has hangnail
It moves or slides out of side slope the soil body, and then can be improved the stability of pattern foundation pit supporting structure.
With reference to first aspect, in the first possible implementation of the first aspect of the application, soil nailing includes multiple
Cylinder, multiple cylinders are sequentially connected along its axial direction.
Above-mentioned technical proposal, soil nailing can be required according to practice of construction, be connected using multiple cylinders, be arranged to be suitble to beat
Enter the length of specific side slope, to improve applicability.
The possible implementation of with reference to first aspect the first, second in the first aspect of the application are possible
In implementation, the junction of multiple cylinders is fixed with reinforcement steel band.
Above-mentioned technical proposal, the junction of multiple cylinders is fixed to reinforce steel band, can enhance the strong of the soil nailing of more piece setting
Degree, and then improve the firm performance of pattern foundation pit supporting structure.
With reference to first aspect, in the third possible implementation of the first aspect of the application, hangnail and cylinder
The angle of axis is 10 ° -30 °.
Above-mentioned technical proposal is arranged, to increase itself and side slope in 10 ° -30 ° of angle by the axis of hangnail and cylinder
Contact area, so as to prevent soil nailing from moving or sliding out of side slope the soil body, and then can be improved the steady of pattern foundation pit supporting structure
Solidity.
Second aspect provides a kind of construction method for supporting, and construction method for supporting is the following steps are included: earth excavation, shape
At foundation pit and side slope；Side slope drills, to form the multiple mounting holes for being in blossom type arranged；Pacify in mounting hole
Fill soil nailing, wherein soil nailing includes cylinder and hangnail, and multiple hangnail inclinations are connected to the outer wall of cylinder；Slip casting is carried out to soil nailing；
Tapping pipe is installed；Linked network；Construction of shotcrete.
Above-mentioned technical proposal, the soil nailing arranged by the way that blossom type is arranged in the soil body of side slope, since soil nailing has
Thorn, can increase contact area, prevent soil nailing from moving or sliding out of side slope the soil body, infuse soil nailing and the soil body by cement
Slurry forms a structure entirety, gives full play to soil body self structure potential strength, changes slope deforming and collapse state, significantly
Improve side slope overall stability.Construction method for supporting directly squeezes into soil nailing after piercing and carries out slip casting, does not need to be protected
Wall process more efficiently compared with conventional construction method, while avoiding environmental pollution caused by mud off；In addition, soil nailing carries out
Slip casting is capable of forming stable support construction, and traditional plate brad supporting does not carry out grouting with plunger just after squeezing into soil nailing
Gunite concrete is directly carried out, the effect of temporary support is only served.Construction method for supporting can efficiently solve soil body of deep foundation pit
One-time formed pile rate is excavated, and shorter than traditional deep pit construction time, not only can guarantee construction speed, but also can guarantee
Construction quality indirectly saves cost simultaneously as its reliability reduces engineering accident risk for engineering project.
In conjunction with second aspect, in the first possible implementation of the second aspect of the application, side slope is bored
Hole includes: the transverse direction interval between multiple mounting holes along side slope with multiple mounting holes that formation is in blossom type arranged
500mm-1300mm setting；It is 15 ° -20 ° that soil nailing is installed in mounting hole, which includes: the angle of soil nailing and side slope,.
Above-mentioned technical proposal, blossom type arrangement can choose the transverse direction interval 500mm-1300mm setting along side slope,
To be suitable for different geological conditions；Soil nailing is at a certain angle with side slope, and soil nailing and the soil body is made to form one by cement injection
A structure is whole, gives full play to soil body self structure potential strength, changes slope deforming and collapse state, significantly improves side slope
The angle of overall stability, soil nailing and side slope can choose 15 ° of -20 ° of settings, to be suitable for different geological conditions.
In conjunction with second aspect, in second of possible implementation of the second aspect of the application, side slope is bored
Hole includes: to be drilled using pneumatic impact machine side slope.
Above-mentioned technical proposal is drilled using pneumatic impact machine, and it is convenient to operate with, and recruitment cost is low.
In conjunction with second of possible implementation of second aspect, the third in the second aspect of the application is possible
In implementation, the drilling parameter of pneumatic impact machine are as follows: 78-120r/min revolving speed, 60-80Mpa bit pressure and 15m3/ h clear water is big
Pump amount drilling；It is crept into when side slope is crushed zone using carbide drill, drilling parameter are as follows: 45-65r/min revolving speed,
10-30Mpa bit pressure and 10m3/ h pump amount drilling.
The drilling parameter of above-mentioned technical proposal, pneumatic impact machine is determined according to strata condition difference, to guarantee that soil nailing is squeezed into
Safety and firmness.
In conjunction with second aspect, in the 4th kind of possible implementation of the second aspect of the application, tapping pipe packet is installed
It includes: digging out sluicing pore in side slope, be inserted into drain hole after one end of tapping pipe is wrapped up with nylon wire, so that tapping pipe
The other end towards foundation pit, the other end of tapping pipe is inserted into cobble.
One end of above-mentioned technical proposal, tapping pipe embedment is wrapped up with nylon wire, prevents foreign matters from being blocked；Tapping pipe is exposed
Cobble is inserted in one end, cobble is removed again after the completion of subsequent construction of shotcrete, to prevent construction of shotcrete
Tapping pipe is blocked in the process.
In conjunction with second aspect, in the 5th kind of possible implementation of the second aspect of the application, gunite concrete is applied
Work includes: that construction of shotcrete includes just spray and multiple spray.
Above-mentioned technical proposal, construction of shotcrete is using just spray and sprays two procedures again, reaches concrete cover
Design requirement, so that it is guaranteed that the stability of pattern foundation pit supporting structure.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment
Attached drawing is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of soil nailing in first alternative embodiment of the application；
Fig. 2 is the structural schematic diagram of soil nailing in second alternative embodiment of the application；
Fig. 3 is the structural schematic diagram of pattern foundation pit supporting structure in one alternative embodiment of the application；
Fig. 4 is the flow chart of construction method for supporting in one alternative embodiment of the application.
Icon: 10- soil nailing；110- cylinder；120- hangnail；10a- soil nailing；130- reinforces steel band；20- pattern foundation pit supporting structure；210-
Foundation pit；220- side slope；A- is once excavated；B- secondary excavation.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is implemented
The component of example 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 herein provided in the accompanying drawings below to protect
The scope of the present application of shield, but it is merely representative of the selected embodiment of the application.Based on the embodiment in the application, this field
Those of ordinary skill's every other embodiment obtained without creative efforts belongs to the application guarantor
The range of shield.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain item exists
It is defined in one attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present application, it should be noted that the orientation or positional relationship of the instructions such as term "inner", "lower" is
Be based on the orientation or positional relationship shown in the drawings or this application product using when the orientation or positional relationship usually put,
It is merely for convenience of description the application and simplifies description, rather than the device or element of indication or suggestion meaning must have spy
Fixed orientation is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
In the description of the present application, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be with
It is mechanical connection, can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary
It is logical.For the ordinary skill in the art, can be understood with concrete condition above-mentioned term in this application specifically contain
Justice.
In this application unless specifically defined or limited otherwise, fisrt feature can be on or below second feature
It is directly contacted including the first and second features, also may include that the first and second features are not direct contacts but pass through them
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature the
Right above two features and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is second
Under feature, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of fisrt feature water
Flat height is less than second feature.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
First alternative embodiment of the application provides a kind of soil nailing 10, can since soil nailing 10 has hangnail 120
The contact area for increasing soil nailing 10 and side slope 220 (please referring to shown in Fig. 3), prevents soil nailing 10 from moving out of side slope 220 the soil body
Or it slides, and then can be improved the stability of pattern foundation pit supporting structure 20 (please referring to shown in Fig. 3).
Referring to FIG. 1, Fig. 1 shows the specific structure of the soil nailing 10 of first alternative embodiment of the application offer.
Soil nailing 10 includes cylinder 110 and hangnail 120.Cylinder 110 usesSteel pipe, under cylinder 110
End is taper tip, is squeezed into the soil body of side slope 220 convenient for soil nailing 10；It is split on the outer wall of the close taper tip of cylinder 110Injected hole (being not drawn into figure), to soil nailing 10 carry out slip casting when, cement slurry by injected hole flow into soil nailing 10 and
In the soil body attaching space of side slope 220.Hangnail 120 uses 30*30 angle steel, multiple 120 (particular numbers of hangnail 120 of hangnail
Can according to actual needs depending on, can be 6,10 or other quantity) be welded on to interleaved on cylinder 110, hangnail
120 can be any one angle within the scope of 10 ° -30 ° with the angle of the axis of cylinder 110.Since soil nailing 10 has
Thorn 120, by the setting of hangnail 120 and the inclined angle of axis of cylinder 110, Lai Zengjia hangnail 120 and 220 soil body of side slope
Contact area, so as to prevent soil nailing 10 from moving or sliding out of side slope 220 the soil body, and then can be improved foundation pit branch
The stability of shield 20.
It should be noted that it is attached based on specification for describing words such as " lower ends " of positional relationship in the embodiment of the present application
Positional relationship in figure repeats no more hereinafter come what is determined.
In the embodiment of the present application, the specific material and size of cylinder 110 and hangnail 120 are not limited, in others
In alternative embodiment, cylinder 110 can also use the metal tube of other sizes according to particular condition in use, such asAluminium-alloy pipe；Hangnail 120 can also use the sheet metal of other sizes according to particular condition in use, than
Such as 40*40 iron plate.
Second alternative embodiment of the application provides a kind of soil nailing 10a, referring to FIG. 2, Fig. 2 shows the application
The specific structure for the soil nailing 10a that second alternative embodiment provides.
Soil nailing 10a is roughly the same with the structure of soil nailing 10, unlike, soil nailing 10a includes multiple being connected with hangnail 120
The cylinder 110 of (please referring to shown in Fig. 1) (shows situation when two cylinders 110, the quantity of cylinder 110 can root in Fig. 2
Depending on actual demand), multiple cylinders 110 are successively welded along its axial direction.Soil nailing 10a can be wanted according to practice of construction
It asks, is connected using multiple cylinders 110, be arranged to be suitble to squeeze into the length of specific side slope 220, to improve applicability.For example, can
According to cutting depth and to excavate slope slope than the following length of different settings: L=10000mm, L=9000mm, L=8000mm,
L=7000mm, L=5000mm.The junction of multiple cylinders 110, which is welded with, reinforces steel band 130, and reinforcing steel band 130 can increase
The intensity of the soil nailing 10a of strong more piece setting, and then improve the firm performance of pattern foundation pit supporting structure 20.
In the embodiment of the present application, the connection of hangnail 120, multiple cylinders 110 and reinforcement steel band 130 is all made of welding
Form, it should be noted that the embodiment of the present application does not limit hangnail 120, multiple cylinders 110 and the company for reinforcing steel band 130
Mode is connect, in some other alternative embodiment, the form that can also be bolted and fixed is connected.
In addition, another embodiment of the application additionally provides a kind of construction method for supporting, it can be in branch sheath internal pore water
Under preservation is abundant, soil layer is loose or the execution conditions without cementing sandy soil or more closely knit gravel soil or mixed gravelly soil,
It effectively prevent hole wall easily to collapse, enables the smooth pore-forming of armored concrete, to guarantee the stabilization of pattern foundation pit supporting structure 20.It please refers to
Shown in Fig. 3 and Fig. 4, Fig. 3 shows the specific structure of the pattern foundation pit supporting structure 20 of one alternative embodiment of the application offer, and Fig. 4 shows
The detailed process of the construction method for supporting of one alternative embodiment of the application offer has been provided.
In the embodiment of the present application, construction method for supporting is used to construct to Urban Underground pipe gallery, it should be noted that
The embodiment of the present application does not limit the scope of application of construction method for supporting, in some other alternative embodiment, supporting construction side
Method also can be applied to following scene: gib when soil excavation, as Deep Excavation for High-rise Building, underground mechanism apply
Work is excavated, slight slope excavates etc.；Permanent soil-baffling structure, such as tunnel portal end wall；To existing soil-baffling structure and unstability side slope
Reinforce etc.；Deep foundation pit earthwork digging and supporting construction under complex geological condition such as backfill rubbish and miscellaneous fill stratum, cobble
With rubble stratum, the uneven, soil layer for not being able to satisfy load-bearing of soil layer geology etc.；In addition, narrow on construction ground, building distance
Closely, large-scale slope protection construction equipment does not have equally applicable when enough working faces.
Construction method for supporting the following steps are included:
One, earth excavation is carried out, forms foundation pit 210 and side slope 220, as shown in Figure 3.Before carrying out earth excavation, also
The sloping coefficient for needing base area to survey report and drawing requirement carries out the work of surveying and locating early period, and checks mechanical equipment as dug
Whether the operating condition of pick machine, loading machine etc. is normal, whether meets construction requirement.210 main body of foundation pit is using " open cut is suitable to build " method
Construction, it may be assumed that the stage excavation earthwork from top to bottom is successively suitable from bottom to top after plain concrete bed course of constructing to make each layer structure to bottom is cheated.
It is carried out according to the basic principle of " segmentation, layering, sub-unit, piecemeal, symmetrical, parallel, completion excavation and support of prescribing a time limit ".Wherein
Segmentation principle is: dividing the excavation stage by bid duration, pipeline protection, by code requirement, is drawn with construction joint, deformation joint position
Separation structure construction section；Layering principle is: being layered according to longitudinal length and 210 base bearing capacity of foundation pit, every layer of junction is set
Gentle slope overlap joint；Slope principle is: according to drawing and ground survey data decision sloping coefficient；Excavating unit is: with 30 meters of a length of 1 lists
Member, each each layer of unit should excavate completion within 48 hours, and hereafter the last layer completes bed course in 8 hours after excavating
Operation reduces 210 exposure duration of foundation pit to the greatest extent, and a settlement observation point is arranged at 210 edge of gallery foundation pit in each unit, with
210 sedimentation and deformation of periodic observation foundation pit, and corresponding supporting scheme is made to guarantee construction safety according to its deformation；Piecemeal principle
Be: first big face excavates main center side and digs Bian Shunzuo slope process, excavates to specified supporting section, it is artificial to reserve 200mm soil layer
Cooperate excavator to carry out fine levelling operation, and secondary excavation B is carried out to catch pit or other structures layer excavation section.Wherein base
The excavation point in hole 210 is primary to excavate A and secondary excavation B, as shown in figure 3,210 depth of foundation pit of secondary excavation B is excavated than primary
210 depth of foundation pit of A increases -6.25%~+18.75%, the reserved primary foundation pit 210 for excavating A of the substrate after secondary excavation B
The 5% of depth, so that using mechanical bond manually clear bottom after the completion of the last layer supporting.During earth excavation, to reserve
Work surface guarantees that piping lane construction can be gone on smoothly, and intercepting ditch is arranged at excavating sideline again.
Two, side slope 220 drills, to form the multiple mounting holes for being in blossom type arranged.Using Pneumatic immpacting
Machine side slope 220 drills, drill bit specification: usingCarbide drill also needs to pacify pneumatic impact machine before spudding in
The inspection of row repetition measurement is put into, to ensure to install, in place accurate.Drilling parameter is determining according to strata condition difference, drilling parameter
Are as follows: 78-120r/min revolving speed, 60-80Mpa bit pressure and 15m3The big pump amount drilling of/h clear water；Crushed zone is bored using alloy bit
Into drilling parameter are as follows: 45-65r/min revolving speed, 10-30Mpa bit pressure and 10m3/ h pump amount drilling, on the stratum for having sliding surface
In, forbid band water drilling into.Along transverse direction interval 1000mm setting (the specific interval of side slope 220 between plurality of mounting hole
Numerical value can be any one numerical value in the range of 500mm-1300mm depending on practice of construction demand).Boring positioning
Shi Caiyong total station makes foundation pit 210 and excavates control sideline and 210 top line elevation of foundation pit, then according to elevation parameter and peace
The array pitch in dress hole determines the vertical position of first row mounting hole.
Three, soil nailing is installed in mounting hole.Soil nailing uses soil nailing 10 (or soil nailing 10a) according to Specific construction situation, passes through
Brad driver directly squeezes into soil nailing 10 (or soil nailing 10a) in mounting hole.The wherein folder of soil nailing 10 (or soil nailing 10a) and side slope 220
Angle is any one in 15 ° -20 °, and soil nailing 10 (or soil nailing 10a) position error is not more than 20mm, and driving depth error is small
In 100mm, angular error is squeezed into less than 1.5 °.Soil nailing 10 (or soil nailing 10a) and side slope 220 are at a certain angle, make soil nailing 10
(or soil nailing 10a) and the soil body form a structure entirety by cement injection, give full play to soil body self structure potential strength,
Change 220 deformation and failure state of side slope, significantly improves 220 overall stability of side slope.
Four, slip casting is carried out to soil nailing 10 (or soil nailing 10a).Soil nailing 10 (or soil nailing 10a) slip casting uses ratio of mud 0.5-
0.6,42.5 ordinary portland cement of cement selection carries out material inspection first after marching into the arena, and when construction prepares in strict accordance with specification
Pure water cement paste.After soil nailing 10 (or soil nailing 10a) installs, grout pipe is slowly inserted into the hole of the upper end of cylinder 110,
Grout pipe is preferably 25-50mm away from bottom hole, forbids to shake up and down, and torsion and vibration, are extracted again after slip casting finishes back and forth
Grout pipe, grouting pressure use 4.0-6.0Mpa.Stop grouting plug is arranged in slip casting, guarantees grouting pressure.When slip casting, grouting amount according to
The depth and drilling diameter of mounting hole determine mortar theoretical amount, guarantee that grouting amount is greater than theoretical amount, until soil nailing 10 (or
Soil nailing 10a) around occur stopping slip casting after returning slurry, to ensure that slip casting is full.
Five, tapping pipe is installed.The installation number of tapping pipe, will also according to soil layer in the case where meeting design requirement
Matter situation suitably increases the quantity of tapping pipe on aqueous high stratum and position.It manually digs out and is not less than in 210 wall of foundation pit
The sluicing pore of 50mm, depth are greater than 500mm；It is put intoPVC (Polyvinyl chloride polyvinyl chloride) material
Matter tapping pipe, sluicing pipe orifice are wrapped up with nylon wire；Exposed pore is inclined downwards towards foundation pit 210, fills out in exposed pore
Enter 10-20mm partial size cobble.Tamper is removed after the 7th step construction of shotcrete, prevents gunite concrete from blocking
Tapping pipe.
Six, linked network.Linked network uses reinforced mesh: horizontal direction (i.e. the transverse direction of side slope 220),Reinforcing bar
Mesh sheet；Vertically (i.e. the longitudinal direction of side slope 220),Reinforced mesh.The mesh sheet lap of splice is not less than 300mm.Soil nailing
10 (or soil nailing 10a) and linked network surface layer are connected with well word liner, well word pad size are as follows:L=200mm, well word lining
Pad is welded with soil nailing 10 (or soil nailing 10a), and is welded with reinforced meshReinforcing rib.
Seven, construction of shotcrete.According to the use of the good cement hardener of spray-up workload computing, cement sandstone raw material
Amount, with guarantee spray-up work it is continuous, go on smoothly.For gunite concrete because cement consumption is larger, sand factor is higher, and adds
A certain amount of accelerator, reduces the shrinkage of setting period, and the shrinkage of hardening period increases, and if not being controlled, spray-up is past
Toward the well-regulated shrinkage cracking of appearance.
(1) whitewashing sprays pea gravel concreten using C20 slope surface linked network, and match ratio is according to water: cement: sand: rubble: rapid hardening
Agent=0.4:1:4:4.5:0.03, ballast grain sizes < 12mm；
(2) preferably from top to bottom, be ejected into vertical wall distance is 0.8m to injection order, and injection direction is perpendicular to by spray plane
(when nozzle is perpendicular to by spray plane, rebound loss is minimum, and concrete is also most closely knit), nozzle with by spray plane spacing with 0.6-1m
Left and right is advisable；
(3) injection includes just spray and multiple spray, and first time 30mm just sprays, and second of 70mm sprays again, sprays protective layer in total and exists
Interior 100mm, it is 0.3Mpa that slope surface, which sprays pressure,.
By in the soil body of side slope 220 be arranged blossom type arrange soil nailing 10 (or soil nailing 10a), due to soil nailing 10 (or
Soil nailing 10a) there is hangnail 120, contact area can be increased, prevent soil nailing 10 (or soil nailing 10a) out of, side slope 220 the soil body
Mobile or landing, makes soil nailing 10 (or soil nailing 10a) and the soil body form a structure entirety by cement injection, gives full play to soil
Body self structure potential strength changes 220 deformation and failure state of side slope, significantly improves 220 overall stability of side slope.Supporting
Construction method can efficiently solve the one-time formed pile rate of 210 soil excavation of deep basal pit, and excavate than traditional deep basal pit 210
Construction time is short, not only can guarantee construction speed, but also can guarantee construction quality, simultaneously as its reliability reduces engineering
Accident risk indirectly saves cost for engineering project.In addition, construction method for supporting does not need to carry out retaining wall process, boring
Soil nailing 10 (or soil nailing 10a) is directly squeezed into behind hole and carries out slip casting, construction efficiency is effectively promoted, while avoiding mud shield
Environmental pollution caused by wall destroys.
And traditional plate brad supporting includes bored grouting type soil nailing, directly squeezes into type soil nailing and squeeze into slip casting type soil nailing.Drilling
For slip casting type soil nailing after soil body drilling, the merging reinforcing bar body of rod carries out gunite concrete again, loosely waits unfavorable geologies item for soil layer
The soil body of part cannot form effective support, be easy to cause and collapse.Directly squeezing into type soil nailing is that steel pipe is directly squeezed into the soil body,
Slip casting is no longer carried out, the effect of gib is only served, support construction steady in a long-term cannot be formed.Squeeze into slip casting type soil nailing
It is directly to squeeze into steel pipe in the soil body and carry out slip casting, cost is excessively high, and is not suitable for permanent work.Soil in the application
10 (or soil nailing 10a) are followed closely, steel pipe is directlyed adopt and is made, and offers injected hole and is provided with hangnail, cost is lower；It constructed
Cheng Zhong, first drilling forms the mounting hole of blossom type arranged before squeezing into the soil body, then is squeezed into, and last slip casting makes
Soil nailing 10 (or soil nailing 10a) and the soil body give full play to soil body self structure intensity by cement injection one structure entirety of formation
Potentiality, have combined the advantage of three kinds of soil nailings in traditional plate brad supporting, and are suitble to support construction steady in a long-term.
In actual different geological conditions construction application, construction method for supporting is had the advantage that
(1) economic and practical, easy construction, short construction period.Place needed for constructing is small, and mobile flexible, supporting construction is basic
Not independent occupied space can be excavated close to existing building, be applied when, slope surface inclination in irregular shape not by excavation face
The influence of work.
(2) foundation pit collapse under complicated geological, platform unstable be can solve, slope inclination, foundation pit 210 settle uneven etc. ask
Topic.
(3) do not need to carry out mud off, can effectively improve that deep foundation pit earthwork digging under complicated geological constructs it is primary at
Type rate.
(4) influence and destruction of the retaining wall process to environment in conventional construction method are avoided, is significantly improved deep under complicated geological
It excavation quality and eliminates safe hidden trouble.
(5) construction efficiency is high.Soil nail wall is constructed with earth excavation, and layer and section carries out, and earth excavation basic synchronization,
It is verified through site operation, the efficiency of construction method for supporting is the decades of times of " traditional deep pit digging ".
(6) construction equipment and simple process, do not need special installation and material, and common steel pipe is carried out improvement upgrading
Soil nailing is made；Common machinery simple refit can put into construction.Construction equipment and simple process do not need complicated technology
With large-scale equipment, construction interferes ambient enviroment small.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any
Modification, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of soil nailing, it is characterised in that:
The soil nailing includes cylinder and hangnail；
Multiple hangnail inclinations are connected to the outer wall of the cylinder.
2. soil nailing according to claim 1, it is characterised in that:
The soil nailing includes multiple cylinders, and multiple cylinders are sequentially connected along its axial direction.
3. soil nailing according to claim 2, it is characterised in that:
The junction of multiple cylinders is fixed with reinforcement steel band.
4. soil nailing according to claim 1, it is characterised in that:
The angle of the axis of the hangnail and the cylinder is 10 ° -30 °.
5. a kind of construction method for supporting, which comprises the following steps:
Earth excavation forms foundation pit and side slope；
It drills to the side slope, to form the multiple mounting holes for being in blossom type arranged；
Soil nailing is installed in the mounting hole, wherein the soil nailing includes cylinder and hangnail, and multiple hangnail inclinations are connected to
The outer wall of the cylinder；
Slip casting is carried out to the soil nailing；
Tapping pipe is installed；
Linked network；
Construction of shotcrete.
6. construction method for supporting according to claim 5, it is characterised in that:
It is described to drill to the side slope, include: in multiple mounting holes of blossom type arranged to be formed
It is arranged between multiple mounting holes along the transverse direction interval 500mm-1300mm of the side slope；
It is described in the mounting hole installation soil nailing include:
The soil nailing and the angle of the side slope are 15 ° -20 °.
7. construction method for supporting according to claim 5, it is characterised in that:
It is described to the side slope carry out drilling include:
It is drilled using pneumatic impact machine to the side slope.
8. construction method for supporting according to claim 7, it is characterised in that:
The drilling parameter of the pneumatic impact machine are as follows: 78-120r/min revolving speed, 60-80Mpa bit pressure and 15m3The big pump amount of/h clear water
Drilling；It is crept into when the side slope is crushed zone using carbide drill, drilling parameter are as follows: 45-65r/min revolving speed, 10-
30Mpa bit pressure and 10m3/ h pump amount drilling.
9. construction method for supporting according to claim 5, it is characterised in that:
The installation tapping pipe includes:
Sluicing pore is dug out in the side slope, and the drain hole is inserted into after one end of the tapping pipe is wrapped up with nylon wire
It is interior, so that the other end of the tapping pipe inserts cobble towards the foundation pit, by the other end of the tapping pipe.
10. construction method for supporting according to claim 5, it is characterised in that:
The construction of shotcrete includes:
The construction of shotcrete includes just spray and multiple spray.
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| CN201910529087.4A CN110206043A (en) | 2019-06-18 | 2019-06-18 | Soil nailing and construction method for supporting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910529087.4A CN110206043A (en) | 2019-06-18 | 2019-06-18 | Soil nailing and construction method for supporting |
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