CN208309592U - Foundation pit supporting structure - Google Patents
Foundation pit supporting structure Download PDFInfo
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- CN208309592U CN208309592U CN201721878253.4U CN201721878253U CN208309592U CN 208309592 U CN208309592 U CN 208309592U CN 201721878253 U CN201721878253 U CN 201721878253U CN 208309592 U CN208309592 U CN 208309592U
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- foundation pit
- slope protection
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Abstract
The utility model relates to a excavation supporting technology field provides a excavation supporting construction. The foundation pit supporting structure is used for being connected to the existing building foundation and comprises slope protection piles, wherein the slope protection piles are connected to the existing building foundation through anchor bars and/or brackets. The foundation pit supporting structure is connected with the existing building foundation and a slope protection pile through anchor bars, and replaces tension provided by anchor rods or inner supports; or, the bracket piles are used for sharing part of load of the original building foundation so as to reduce the pressure of the side wall of the foundation pit; or, the two connection modes are used simultaneously to replace the tension provided by the anchor rods or the inner supports and share part of the load of the original building foundation so as to reduce the pressure of the side wall of the foundation pit. The construction method avoids the problems that construction is inconvenient and the original structure is influenced when pile anchor supporting is adopted, and avoids the problems that construction cost is high and later construction is influenced when inner supporting is adopted. In addition, the problem that the supporting cost greatly rises due to the adoption of cantilever shores is solved.
Description
Technical field
The utility model relates to Base hole supporting technology field more particularly to a kind of foundation pit supporting constructions.
Background technique
With the high speed development of urban construction, the utilization of the underground space is increasingly taken seriously, so that multiple material handling method of deep foundation pit
Significant progress is obtained.Various support forms emerge one after another, and northern area preferable for geotechnical engineering geological conditions is normal
Support form has 1 wall supporting of soil nailing, cantilever pile supporting, pile-anchor retaining, inner support supporting etc., wherein piled anchor formula supporting knot
Structure, inner support supporting construction are most widely used in deep foundation pit support due to control deformation effect is good.
Referring to Figure 1,1 wall supporting of soil nailing is a kind of supporting of stability of slope formula, passes through 1 active build-in slope soil of soil nailing
To increase the stability of side slope.It is less strict to be widely used in shallower and side slope deformation requirements because of the lower advantage of its cost
Foundation pit.The advantages of 1 wall supporting of soil nailing be that construction technology is simple and short time limit, effect preferably, good economy performance, soil property preferably
Area is widely used.Disadvantage is not to be suitable for the bad area of soil property, cannot efficiently control the deformation of side slope.
Fig. 2 is referred to, cantilever retaining structure remains whole by the bending resistance of enough embedded depths and structure
Stable and structure safety.Cantilever pile formula supporting construction is suitable for the base of the preferable cutting depth of soil property shallower (generally within 6m)
Cheat engineering.Its advantage is that simple process, optional pile-type and pile making method are more.Disadvantage is, easy production very sensitive to cutting depth
Raw biggish deformation generates adverse effect to adjacent buildings or structures.
When cantilever supporting structure is unable to satisfy foundation pit deformation requirement, pile-anchor retaining or inner support branch can be generally used
Shield.
Refer to Fig. 3, anchored pile supporting is a kind of to increase one or multi-channel anchor pole 3 in the vertical direction of slope protection pile 2
The support form of (or anchor cable) offer horizontal pull.This kind of support form is because its Deformation control is good, and construction technology is mature, in north
Square area is widely used.Its advantage is that the deformation of side slope can be preferably controlled, it is small to effect of adjoining buildings.Disadvantage is side slope
The soil body must have 3 execution conditions of anchor pole.
Fig. 4 is referred to, inner support supporting construction is that slope protection pile 2 or board wall increase together in vertical direction on the inside of foundation pit
Or the support 4 of multiple tracks reinforced concrete is to provide enough drags.This kind of supporting construction is mostly used to want deformation in foundation pit surrounding environment complexity
Ask high, and in the case that anchor pole 3 can not construct or cannot provide enough pulling force.Its advantage is that not changing slope soil status, become
Shape is controlled.Disadvantage is support cost height, and the construction period is long, gives work to subsequent underground part and is affected.
Refer to Fig. 5, often encountered in engineering practice fluting boundary close to existing building basis 5 the case where.Fig. 5
In, existing building uses CFG stake 7 (cement fly ash gravel pile) composite foundation.Existing building upper load is by CFG stake 7
With 8 shared of existed building ground, no matter individual CFG stakes 7 are destroyed or the inter-pile soil of existed building ground 8 is laterally wriggled change
Shape all can cause to seriously affect to inhering architecture, therefore proposed building foundation pit supporting structure is higher to deformation requirements.In this feelings
The selection of support system is the key point of Foundation Pit Support Design under condition.And existing building exterior wall as can see from Figure 5
6, slot boundary 9 and proposed building of proposed building is slotted slot bottom 10.
First 1 wall support system Deformation control ability difference of soil nailing and cannot select.Cantilever pile Deformation control is slightly compared with 1 wall of soil nailing
It is good, but it is big for this top of the slope additional load under conditions of pair potential necessity increase that stake is long and the rigidity of stake is to meet deformation requirements,
This results in sharp rising for support cost.Pile-anchor retaining needs anchor pole 3 of constructing under existing building ground, not can avoid pair
The destruction of CFG stake 7, and the construction of anchor pole 3 can disturb foundation soil, therefore pile-anchor retaining can not use.And for inner support
Although support system Deformation control is good, phase is used in northern area due to its cost is high and has on construction in later period and centainly influences
To less.
Utility model content
The utility model aims to solve at least one of technical problems existing in the prior art or related technologies.
One of purpose of the utility model is: providing a kind of foundation pit supporting construction, solves existing in the prior art
It is unable to satisfy deformation requirements when foundation pit supporting construction is close to existing building basis or cost is high or influence construction in later period
Problem.
In engineering practice often encounter fluting boundary close to existing building basis situation.
In order to realize the purpose, the utility model provides a kind of foundation pit supporting construction, builds for being fixedly connected on to have
On the basis of building object, including slope protection pile, the slope protection pile are connected on the basis of the existing building by dowel and/or bracket.
Preferably, crown beam is installed, the crown beam is connected to described existing by dowel and/or bracket in the slope protection pile
On the basis of building.
Preferably, on the basis of the slope protection pile is connected to the existing building by dowel and bracket, and the dowel
With the interspersed setting of bracket.
Preferably, the slope protection pile is connected on the basis of the existing building by dowel.
Preferably, crown beam is installed, described dowel one end is inserted into the crown beam, and the other end is inserted into institute in the slope protection pile
It states in existing building basis.
Preferably, the slope protection pile is connected on the basis of the existing building by bracket.
Preferably, crown beam is installed, slope protection pile bracket one end is fixed in the crown beam, another in the slope protection pile
The existing building ground beneath is inserted at end.
Preferably, the lower section on the existing building basis is cement fly ash gravel pile and existed building ground.
Preferably, the slope protection pile is building concrete column or steel column.
The technical solution of the utility model has the advantage that the foundation pit supporting construction of the utility model, is connected by dowel
Existing building basis and slope protection pile are connect, come the pulling force for replacing anchor pole or inner support to provide；Alternatively, being shared by bracket stake original
The fractional load of building foundation, to mitigate foundation pit side-wall pressure；Or two kinds of connection types are used simultaneously, bar planting and shield be both set
The mode of slope stake connection gets off to share original come the pulling force for replacing anchor pole or inner support to provide further through bracket stake insertion original base
There is the fractional load of building foundation, to mitigate foundation pit side-wall pressure.Which obviate construction inconvenience when using pile-anchor retaining with
And the problem of influencing original structure, and avoid using cost height caused by inner support supporting and influence asking for construction in later period
Topic.In addition, which obviate sharp risen using support cost existing for the supporting of the cantilever village.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the soil-nail wall support of the prior art；
Fig. 2 is the structural schematic diagram of the cantilever pile supporting of the prior art；
Fig. 3 is the structural schematic diagram of the pile-anchor retaining of the prior art；
Fig. 4 is the structural schematic diagram of the inner support supporting of the prior art；
Fig. 5 is the structural schematic diagram of the pattern foundation pit supporting structure close to existed building of the prior art；
Fig. 6 is the structural schematic diagram of the foundation pit supporting construction of embodiment one；
Fig. 7 is the structural schematic diagram of the foundation pit supporting construction of embodiment two；
Fig. 8 is the structural schematic diagram of the foundation pit supporting construction of example IV；
Fig. 9 is the schematic cross-sectional view in Fig. 8 at A-A；
Figure 10 is the schematic cross-sectional view in Fig. 8 at B-B；
Figure 11 and Figure 12 is the scheme of installation of the dowel of example IV；
Figure 13 and Figure 14 is the scheme of installation of the bracket of example IV；
In figure: 1, soil nailing；2, slope protection pile；3, anchor pole；4, reinforced concrete supports；5, existing building basis；6, existed building
Beyond the region of objective existence wall；7, CFG；8, existed building ground；9, proposed building fluting boundary；10, proposed building fluting slot bottom；11,
Crown beam；12, dowel；13, bracket；14, foundation pit top curve；15, foundation pit lower collar thread；16, bar planting column；17, bracket column；18, first
Dotted line；19, the second dotted line；20, overstriking black line；21, the area C Building B valve plate basis；22, main reinforcement；23, remaining soils；24, bed course knot
Structure；25, original base；26, stirrup.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.It should be noted that in the absence of conflict, this Shen
The feature in embodiment and embodiment please can be combined with each other.
In the description of the present invention, it should be noted that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For limitations of the present invention.In addition, term " first ", " second ", " third " are used for description purposes only, and should not be understood as
Indication or suggestion relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " phase
Even ", " 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
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embedding re-bar technique is widely used in reinforced concrete work, be one kind in reinforced concrete structural element with
Structure glue plants the post-anchoring technology of Ribbed Bar or full flight screw.There is building strengthening shortly, obtain in building rectification
It is widely applied.But there is no apply in foundation pit supporting project.
Likewise, the effect of bracket 13 is primarily used to backbar, it is generally located on building concrete column, on steel column, factory
Room is more for shelving crane girder, and rarely has use on pattern foundation pit supporting structure.
The foundation pit supporting construction of the application, for being connected to existing building basis 5, including slope protection pile 2, the slope protection
Stake 2 is connected on the existing building basis 5 by dowel 12 and/or bracket 13.
The foundation pit supporting construction of the application connects existing building basis 5 and slope protection pile 2 by dowel 12, to replace anchor
The pulling force that bar 3 or inner support provide；Alternatively, sharing the fractional load on existing building basis, by bracket 13 to mitigate foundation pit
Lateral wall pressure；Or simultaneously use two kinds of connection types, the mode that bar planting is connect with slope protection pile 2 had both been set replace anchor pole 3 or
The pulling force that inner support provides is inserted into the fractional load that original base 25 gets off to share existing building basis further through bracket 13,
To mitigate foundation pit side-wall pressure.The problem of construction when which obviate using pile-anchor retaining is inconvenient and influences original structure,
And the problem of avoiding using cost height caused by inner support supporting and influencing construction in later period.In addition, which obviate using outstanding
The problem of support cost existing for the supporting of the arm village sharp rises.
The foundation pit supporting construction of the application preferably but is necessarily equipped with crown beam 11 in the slope protection pile 2, and described
Crown beam 11 is connected on the existing building basis 5 by dowel 12 and/or bracket 13.
Embodiment one
Refer to Fig. 6, the foundation pit supporting construction of the present embodiment one, the slope protection pile 2 by dowel 12 be connected to it is described
Have on building basis 5.
It, will by being connected after inhering architecture foundation holes are implanted into dowel 12 with slope protection pile 2 in the case of this kind
Slope protection pile 2, dowel 12 are connected with existing building basis 5, by existing building basis 5 and existed building ground 8
Frictional force between soil provides pulling force, reduces the deformation of side slope, it is ensured that the stability of side slope.Dowel therein 12 is preferably but not
It must be Ribbed Bar.
In Fig. 6, crown beam 11 is installed in the slope protection pile 2, described 12 one end of dowel is inserted into the crown beam 11, the other end
It is inserted into the existing building basis 5.
Wherein, the concrete form on existing building basis 5 is unrestricted, and form disclosed in any prior art all should
Comprising within the scope of protection of this application.
In addition, the lower section on the existing building basis 5 is cement fly ash gravel pile and existed building ground in Fig. 6
8.Certainly, the structure of 5 lower section of existing building basis is not limited by the accompanying figures.
It is noted that the concrete form of the slope protection pile 2 of the present embodiment one is also unrestricted, such as it can be
Building concrete column or steel column.
In the present embodiment one, the mode of bar planting provides pulling force on the basis of existing building concrete column, makes foundation pit branch
Protection structure is in equilibrium state, achievees the effect that stability of slope.
Embodiment two
Refer to Fig. 7 and embodiment one the difference is that, the foundation pit supporting construction of the present embodiment two, the slope protection pile 2
It is connected on the existing building basis 5 by bracket 13.
Bracket 13 is set in 2 upper end of slope protection pile in design.When being equipped with crown beam 11 in slope protection pile 2, the bracket 13 1
End is fixed in the crown beam 11.On this basis, by 5 lower section of other end insertion existing building basis of bracket 13.This kind
In the case of, the fractional load on existing building basis 5 can be passed in slope protection pile 2 by bracket 13, while in bracket 13
When stress, slope protection pile 2 generates lateral pressure to the soil of existed building ground 8, not only plays reinforcing to existed building ground 8 and makees
With, and increase the stability of proposed building side slope.
The foundation pit supporting construction of the present embodiment two is not only held in such a way that bracket 13 is inserted under existing building basis 5
Part basis load has been carried on a shoulder pole, load has been reached into bearing course at pile end by 2 pile body of slope protection pile, while after 13 stress of bracket, slope protection
Stake 2 is displaced to ground direction under basis, and the effect of ground extruding is generated to the soil body, while stake can be made to be in stress equilibrium shape
State, to achieve the effect that stability of slope.
Embodiment three
The difference is that, the foundation pit supporting construction of the present embodiment three, slope protection pile 2 passes through with embodiment one and embodiment two
Dowel 12 and bracket 13 are connected on the existing building basis 5, and the dowel 12 and the interspersed setting of bracket 13.
Wherein, " dowel 12 and the interspersed setting of bracket 13 " includes being spaced M bracket 13 per N number of dowel 12 to be arranged, wherein N
It is random natural number with M.
Example IV
Certain sci-tech industrial park area C Building A podium is F3/B3, on the ground five layers of building, frame structure, raft foundation,
Embedded depth of foundation -15.1m.The area C Building B podium is located at the area C Building A podium east side, is basement one, on the ground five layers of building, frame
Structure, raft foundation, embedded depth of foundation -7.05m, ground are 7 composite foundation of CFG stake.Distance between Building A podium and Building B podium
7.6m, proposed at basement one channel, which is isolated footing, frame structure, embedded depth of foundation -7.05m.
According to exploration report, the stratum that this slope retaining is related to is as follows:
3. loess-like silt: pale yellow-lark, soil property is uneven, slightly wet, in it is close, shake reaction is medium, matt, does
Intensity is low, toughness is low, thickness 1.50-6.90m.
3. -1: fine sand: slightly wet, slightly close, gradation is medium, and particle is uneven, and mineralogical composition is based on quartz, feldspar, containing micro
Mica, thickness 0.50-1.40m, the layer are locally distributed in the venue.
4. fine sand: yellow, chiltern is pure, slightly wet, in it is close, gradation is medium, and particle is uneven, and mineralogical composition is with quartz, feldspar
Based on, contain micro mica, thickness 2.5m-5.80m.
5. silt: yellowish-brown-taupe, soil property is uneven, slightly wet, closely knit, and shake reaction is medium, matt, dry strength,
Toughness is low, sporadicly contains small ginger chunk, thickness 1.90-4.80m.
Depth to water is greater than 50m, and when supporting does not consider the influence of underground water.
Foundation Pit Support Design parameter list
Note: band * data are empirical value, remaining is all from exploration report
Foundation pit stope support scheme is determined according to site condition and earth excavation scheme.Along B when owner requires earth excavation
It digs under seat annex exterior wall to -7.05m, then westwards puts the platform of 2.9m, slope is dug to -15.1m still further below, therefore this side slope foundation pit is deep
Degree is 8.05m.
Since foundation pit top curve 14 is too close away from Building B annex basis, and Building B annex basis is carried out using 7 composite foundation of CFG stake
Processing, therefore supporting can not be carried out with piled anchor structure.It finally determines and is drawn using slope protection pile 2+ bracket 13 and slope protection pile 2+ bar planting
The supporting construction that anchor combines, refers to Fig. 8.The bar planting column 16 for installing dowel 12 is shown in Fig. 8, for installing bracket
13 bracket column 17.Also, what the first dotted line 18 in fig. 8 represented is the position of proposed crown beam 11, the second dotted line 19 in Fig. 8
What is represented is the position on proposed isolated footing boundary, and what overstriking black line 20 represented in Fig. 8 is the existing area C Building B valve plate basis 21
Boundary position.Also, it can also be seen that foundation pit top curve 14 and foundation pit lower collar thread 15 from Fig. 8.
This Slope Design slope protection pile 2 totally 57, wherein bracket 13 is arranged 25, and 27, remaining 5 of anchor are drawn in setting bar planting
For common slope protection pile 2.
In Fig. 9 and Figure 10:
Where it can be seen that remaining soils 23 and cushion layer structure 24, and the Building B basis completed.
Slope protection pile 2 designs: stake diameter 0.8m, stake spacing 1.6m, stake long 14.0m, build-in 6.0m.Main reinforcement is 20 Φ 26, ring muscle
14@2000 of φ 6.5@150, reinforcing rib Φ；Concrete strength C30.Stake top sets 0.9 × 0.6 crown beam 11,11 arrangement of reinforcement of crown beam, 14 Φ
16, stirrup 26 is 6.5@200 of φ, concrete strength C30.
1 and Figure 12 referring to Figure 1:
Bracket 13 designs: long 1.2m, wide 0.5m, high 0.3~0.6m.Main reinforcement 22 is 5 Φ 20,6.5@100 of ring muscle φ, coagulation
Native intensity C30, bracket 13 protrude into 0.5m under the podium basis of Building B.
3 and Figure 14 referring to Figure 1:
Dowel 12 designs: 6 Φ 20, totally 2 row, every row 3, array pitch 0.17m pitch-row 0.25m, and punching diameter is 25mm, hole depth
0.35m is bonded with A level structure muscle, and 12 other end of dowel and slope protection pile 2 pour integrally.
This side slope before earth excavation to Building B podium basis and supporting construction at the top of done settlement monitoring point and horizontal displacement
Monitoring point is continued for monitoring during slope construction and during foundation pit use, and monitoring result shows Building B podium base
Plinth is without horizontal displacement, and within settling amount 2mm, supporting construction top horizontal displacement and settling amount have reached pre- within 5mm
Phase effect.Illustrate that being used in bracket 13 and embedding re-bar technique is safe and feasible in pattern foundation pit supporting structure.
In above embodiments, embedding re-bar technique and bracket 13 are brought into a kind of new think of with to slope retaining in slope protection
Road, cost are far below pile-anchor retaining and inner support supporting, through calculating the pile-anchor retaining phase using bar planting and the same pulling force of offer
Than, 1/10th of cost less than pile-anchor retaining of bar planting, and 13 costs of bracket also at low cost compared with pile-anchor retaining 2/3rds.
More advantageous on construction period, the construction of bar planting is completed before being poured 2 crown beam 11 of slope protection pile, and bracket 13 can be with crown beam 11 simultaneously
It is poured concrete, either bar planting or the construction of bracket 13 does not occupy the duration individually, apply so as to greatly shorten supporting
The work duration brings economic benefit to owner.
Bar planting and bracket 13 be technically it is mature, also without difficulty in construction, this two technologies are cooperated slope protections
Stake 2 is used in the pattern foundation pit supporting structure under specific condition, can be substantially reduced support cost, be shortened the construction period.
Embodiment of above is merely to illustrate the utility model, rather than limitations of the present invention.Although referring to implementation
The utility model is described in detail in example, those skilled in the art should understand that, to the technology of the utility model
Scheme carries out various combinations, modification or equivalent replacement, without departing from the spirit and scope of the technical scheme of the present invention, should all
Cover in the scope of the claims of the utility model.
Claims (6)
1. a kind of foundation pit supporting construction, for being connected on the basis of existing building, which is characterized in that described including slope protection pile
Crown beam is installed, the crown beam is connected on the basis of the existing building by dowel and/or bracket in slope protection pile.
2. foundation pit supporting construction according to claim 1, which is characterized in that the slope protection pile is connected by dowel with bracket
On the basis of to the existing building, and the dowel and the interspersed setting of bracket.
3. foundation pit supporting construction according to claim 1, which is characterized in that described dowel one end is inserted into the crown beam,
The other end is inserted into the existing building basis.
4. foundation pit supporting construction according to claim 1, which is characterized in that described bracket one end is fixed on the crown beam
On, the other end is inserted into the existing building ground beneath.
5. foundation pit supporting construction as claimed in any of claims 1 to 4, which is characterized in that the existing building
The lower section on basis is cement fly ash gravel pile and existed building ground.
6. foundation pit supporting construction as claimed in any of claims 1 to 4, which is characterized in that the slope protection pile is to build
Build concrete column or steel column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721878253.4U CN208309592U (en) | 2017-12-28 | 2017-12-28 | Foundation pit supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721878253.4U CN208309592U (en) | 2017-12-28 | 2017-12-28 | Foundation pit supporting structure |
Publications (1)
| Publication Number | Publication Date |
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| CN208309592U true CN208309592U (en) | 2019-01-01 |
Family
ID=64724715
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721878253.4U Expired - Fee Related CN208309592U (en) | 2017-12-28 | 2017-12-28 | Foundation pit supporting structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796333A (en) * | 2021-02-01 | 2021-05-14 | 上海市城市建设设计研究总院（集团）有限公司 | Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof |
| CN115094909A (en) * | 2022-07-22 | 2022-09-23 | 北京中润宝成工程技术有限公司 | Construction method of rotary spraying anchor rod meeting CFG pile |
-
2017
- 2017-12-28 CN CN201721878253.4U patent/CN208309592U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796333A (en) * | 2021-02-01 | 2021-05-14 | 上海市城市建设设计研究总院（集团）有限公司 | Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof |
| CN115094909A (en) * | 2022-07-22 | 2022-09-23 | 北京中润宝成工程技术有限公司 | Construction method of rotary spraying anchor rod meeting CFG pile |
| CN115094909B (en) * | 2022-07-22 | 2024-06-04 | 北京中润宝成工程技术有限公司 | Construction method of rotary-spraying anchor rod of CFG pile |
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