CN110206034A - Annular method of excavation of deep foundation pit - Google Patents

Annular method of excavation of deep foundation pit Download PDF

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Publication number
CN110206034A
CN110206034A CN201910493741.0A CN201910493741A CN110206034A CN 110206034 A CN110206034 A CN 110206034A CN 201910493741 A CN201910493741 A CN 201910493741A CN 110206034 A CN110206034 A CN 110206034A
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CN
China
Prior art keywords
trestle
foundation pit
slope
excavation
pile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910493741.0A
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Chinese (zh)
Inventor
王志权
雷斌
李波
洪明坚
张国林
周明佳
周梅峰
沙桢晖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Gongkan Geotechnical Group Co Ltd
Original Assignee
Shenzhen Gongkan Geotechnical Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Gongkan Geotechnical Group Co Ltd filed Critical Shenzhen Gongkan Geotechnical Group Co Ltd
Priority to CN201910493741.0A priority Critical patent/CN110206034A/en
Publication of CN110206034A publication Critical patent/CN110206034A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G27/00Temporary arrangements for giving access from one level to another for men or vehicles, e.g. steps, ramps
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete

Abstract

The present invention relates to the technical fields of deep pit construction, disclose annular method of excavation of deep foundation pit, steps are as follows: (1), distinguishing construction supporting stake, multiple stand column pile and multiple trestle stakes;(2), construction attachment beam and construction crown beam;(3), trestle is constructed: pouring to form trestle panel, support pile, each trestle stake and each stand column pile distinguish supporting trestle panel;(4), reserved slight slope excavates in lower layer, and slight slope forms slope surface, and slope surface forms joint ramp with trestle panel drop-over;(5), slight slope extends downwardly, up to earth excavation to foundation pit bottom;(6), the earth excavation in foundation pit and outward transport finishes, gradually by slight slope piecewise closing slope from bottom to up;(7), trestle is removed.The slight slope earthwork, which is taken, repairs slope and can be formed, and slight slope is the unearthed a part of foundation pit, greatlys save project cost;It avoids pit earthwork from excavating, is repeated several times and builds ramp of being unearthed, significant increase is unearthed efficiency, and shortening construction period.

Description

Annular method of excavation of deep foundation pit
Technical field
The invention patent relates to the technical fields of deep pit construction, apply in particular to annular deep pit digging Work method.
Background technique
During excavation, it is necessary in strict accordance with the theory of tau-effect, using layering, segmentation, it is steady excavate, And it follows with the principle supportted with digging.
In the foundation pit of annular brace, because of the distinctive stress of central shoring and internal force transfer mode, per pass central shoring must close completely The power transmission effect of competence exertion sealing arch after conjunction, therefore, the pit earthwork excavation construction of annular brace must follow strictly per pass The next layer of earthwork is excavated again after support is completely enclosed, it may be assumed that stage excavation to support bottom designed elevation first, then complete whole waist rails It constructs with central shoring, be closed after central shoring and just start next layer of earth excavation operation after intensity reaches requirement.
Currently, annular excavation, generally taking wouldn't be excavated in foundation pit soil outlet position reserved part soil, with this As the interim ramp of earthwork outward transport, after all excavating outward transport to this layer of other positions cubic metre of earth, then will be at the interim ramp Reserved soil is had bad luck to foundation pit, the central shoring at this layer of ramp that start to construct;After completing the road waist rail and central shoring closure, then will The unearthed ramp mouthful position of foundation pit is transported in the reserved earthwork back, and compaction in layers backfills, and builds the interim logical of next layer of earthwork outward transport again Road;It when multiple tracks annular brace is arranged in foundation pit, needs so repeatedly to build ramp repeatedly, until foundation pit bottom is excavated to, using pre- It stays part foundation pit earth to be used as the earthwork and transports outward occasional passage, excavation, backfill process are repeated, generate multiple ramp cubic metre of earth and fall Fortune, backfill, the consuming time is longer, and construction efficiency is low.
Summary of the invention
The purpose of the present invention is to provide annular method of excavation of deep foundation pit, it is intended to solve in the prior art, annular base The problem of cheating excavation construction low efficiency.
The invention is realized in this way annular method of excavation of deep foundation pit, steps are as follows:
(1), construction supporting stake, multiple stand column pile and multiple trestle stakes respectively;
(2), first floor earth excavation, construct attachment beam and construction crown beam, makes the support pile and each stand column pile It is formed whole;
(3), trestle is constructed: pouring to form trestle panel, the support pile, each trestle stake and each described vertical Stanchion is in respectively fixed and arranged, and the support pile, each trestle stake and each column with the trestle panel Trestle panel described in stake difference supporting;
(4), reserved slight slope excavates in lower layer, and the slight slope forms slope surface, and the slope surface is formed with the trestle panel drop-over Joint ramp;
(5), the slight slope extends downwardly, up to earth excavation to foundation pit bottom;
(6), the earth excavation in foundation pit and outward transport finishes, gradually by the slight slope piecewise closing slope from bottom to up;
(7), trestle is removed.
Further, the construction process of the crown beam and the attachment beam are as follows: surveying setting-out → excavation groove → cuts branch Fender pile pile crown is simultaneously cleared up, and → binding crown beam reinforcing bar and connection beam steel → installs crown beam template, connection beam forms → casting concrete → remove the template and conserved.
Further, when the attachment beam and the construction crown beam of constructing, one-piece casting is used with the trestle panel;It applies Work process are as follows: binding trestle reinforcing bar → mounting surface template die plate → casting concrete, the template are placed in the top of the attachment beam.
Further, the trestle pile driving construction process are as follows: preparation of construction → levelling of the land → embedded casing → drilling → end Hole and a borehole cleaning → hang steel reinforcement cage → installation steel pipe post and with steel reinforcement cage welded connecting → review correction steel pipe post Position → downcomer → secondary pile hole cleaning → perfusion pile concrete.
Further, the trestle panel includes horizontal road and inclination road, and the horizontal road and the inclination road are in pair Connect arrangement;The support pile and each stand column pile distinguish horizontal road described in supporting, incline described in each trestle stake supporting Chute, the inclination road form joint ramp with the slope surface drop-over;The gradient in the inclination road is less than 1:8.
Further, the horizontal road includes approach zone and shape is converged in place, the approach zone and the place out out At connected region, the connected region is connected to the inclination road.
Further, the earthwork in foundation pit using subregion symmetrical expression balance excavate, every layer of earth excavation from foundation pit periphery to It is successively promoted in the middle part of foundation pit.
Further, the slope surface compacting processing, and hardened;The slope surface is sprayed mixed in 1:1.5 ratio slope Solidifying soil slope protection.
Further, extending downwardly with the slight slope, piecewise construction reinforcement beam, the both ends of the reinforcement respectively with The trestle stake is in be connected and fixed arrangement.
Further, in step (6), at closing slope initial stage, on the trestle panel and foundation pit, more excavators of setting are connect Power turns native entrucking;Closing slope latter stage, excavator are in the tail end of the trestle panel, complete slight slope with excavator or high-front shovel Clear.
Compared with prior art, annular method of excavation of deep foundation pit provided by the invention, by construction supporting stake, multiple Stand column pile and multiple trestle stakes, play support action to trestle panel, and the drop-over convenient for subsequent trestle panel and slight slope is formed The earthwork in foundation pit is transported outward by forming the realization of joint ramp in joint ramp;Pass through multiple stand column pile and multiple stacks Bridge pier is used as supporting basis, when foundation pit effectively being avoided to be unearthed, influences the stability in joint ramp;Meanwhile the slope surface and stack of slight slope Floorings linking, can reduce the length of trestle, and the slight slope earthwork is taken and repairs slope and can be formed, and slight slope is one that foundation pit is unearthed Point, project cost can be greatlyd save;In addition, pit earthwork is avoided to excavate, it is repeated several times and builds ramp of being unearthed, significant increase is unearthed Efficiency, and shorten the construction period.
Detailed description of the invention
Fig. 1 is the construction process schematic diagram of annular method of excavation of deep foundation pit provided by the invention;
Fig. 2 is the construction schematic diagram of annular method of excavation of deep foundation pit provided by the invention;
Fig. 3 is the construction schematic diagram of annular method of excavation of deep foundation pit provided by the invention;
Fig. 4 is the schematic top plan view of annular method of excavation of deep foundation pit provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.
Realization of the invention is described in detail below in conjunction with specific embodiment.
The same or similar label correspond to the same or similar components in the attached drawing of the present embodiment;In description of the invention In, it is to be understood that if there is the orientation or positional relationship of the instructions such as term " on ", "lower", "left", "right" for based on attached drawing institute The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, rather than the dress of indication or suggestion meaning It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore describe the use of positional relationship in attached drawing Language only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can be with The concrete meaning of above-mentioned term is understood as the case may be.
It is preferred embodiment provided by the invention referring to Fig.1 shown in -4.
Annular method of excavation of deep foundation pit provided by the invention, for solving asking for annular excavation low efficiency Topic.
Annular method of excavation of deep foundation pit, steps are as follows:
(1), construction supporting stake 10, multiple stand column pile 20 and multiple trestle stakes 30 respectively;
(2), first floor earth excavation, construct attachment beam 60 and construction crown beam 70, make the support pile 10 with it is each described Stand column pile 20 forms entirety;
(3), trestle is constructed: pouring to form trestle panel 40, the support pile 10, each trestle stake 30 and each The stand column pile 20 respectively with the trestle panel 40 be in fixed and arranged, and the support pile 10, each trestle stake 30 with And each stand column pile 20 distinguishes trestle panel 40 described in supporting;
(4), reserved slight slope 50 excavates in lower layer, and the slight slope 50 forms slope surface, and the slope surface and the trestle panel 40 are suitable It connects to form joint ramp;
(5), the slight slope 50 extends downwardly, up to earth excavation to foundation pit bottom;
(6), the earth excavation in foundation pit and outward transport finishes, gradually by the slight slope 50 piecewise closing slope from bottom to up;
(7), trestle is removed.
Above-mentioned annular method of excavation of deep foundation pit passes through construction supporting stake 10, multiple stand column pile 20 and multiple stacks Bridge pier 30 plays support action to trestle panel 40, forms joint ramp with the drop-over of slight slope 50 convenient for subsequent trestle panel 40, The earthwork in foundation pit is transported outward by forming the realization of joint ramp;It is used by multiple stand column pile 20 and multiple trestle stakes 30 Supporting basis is done, when foundation pit effectively being avoided to be unearthed, influences the stability in joint ramp;Meanwhile the slope surface of slight slope 50 and trestle face Plate 40 is connected, and can reduce the length of trestle, and 50 cubic metres of earth of slight slope are taken and repair slope and can be formed, and slight slope 50 is one that foundation pit is unearthed Part can greatly save project cost;In addition, pit earthwork is avoided to excavate, slight slope 50, significant increase are built out in multiplicating It is unearthed efficiency, and shortening construction period.
Due to excavation of foundation pit depth, the pattern of bored concrete pile supporting, cement mixing pile or rotary churning pile water stopping curtain is mostly used, or adopt With hole-drilling interlocking pile supporting;As advanced support pile 10, staking out stake, construct by design of its support technical requirements early period.
In the present embodiment, the construction process of crown beam 70 and attachment beam 60 are as follows: surveying setting-out → excavation groove → cuts supporting 10 pile crowns of stake simultaneously clear up → binding 60 reinforcing bar of 70 reinforcing bar of crown beam and attachment beam → and install 70 template of crown beam, 60 template of attachment beam → pour It builds concrete → form removal and is conserved;Realize the construction of crown beam 70 and attachment beam 60.
When attachment beam 60 and the construction crown beam 70 of constructing, one-piece casting is used with trestle panel 40;Construction process are as follows: binding stack Bridge reinforcing bar → mounting surface template die plate → casting concrete, template are placed in the top of attachment beam 60;Make trestle panel 40 and attachment beam 60 and crown beam 70 in one arrangement, improve whole stability, guarantee the stability in joint ramp, guarantee the outward transport of the earthwork;Separately Outside, simplify construction procedure, shorten the construction period.
Earth excavation within the scope of crown beam 70, attachment beam 60 and first road annular brace, is mainly excavated with excavating machinery Based on, indirect labor cooperates finishing substrate and cleaning support pile 10,20 periphery foundation pit earth of stand column pile.
Crown beam 70, attachment beam 60 and first road annular brace are in 200mm on substrate absolute altitude, support pile 10, stand column pile 20300mm is native clearly using manual type.
Attachment beam 60 is lower to be laid with concrete cushion in advance, when first road attachment beam 60 is in 10 70 or less crown beam of support pile, Then it is connect by the way of 10 side bar planting of support pile with attachment beam 60.
Specifically, 30 construction process of trestle stake are as follows: preparation of construction → levelling of the land → embedded casing → drilling → end hole is simultaneously Borehole cleaning → hang steel reinforcement cage → installation steel pipe post and correct the position of steel pipe post with steel reinforcement cage welded connecting → review → downcomer → secondary pile hole cleaning → perfusion pile concrete;Realize the supporting to trestle panel 40.
Each trestle stake 30 realizes comprehensive branch to trestle panel 40 along 40 length of trestle panel and width arranged Shield.
Trestle panel 40 is equipped with concrete guardrail, and concrete guardrail section is 150 × 150mm, a height of 1500mm, spacing It is arranged by 1.5m, it is integrated poured with trestle panel 40 by constructional reinforcement;To improve vehicle safety.
The slope surface of slight slope 50 sets 48 steel tube guardrail of φ, and guardrail height and spacing press 1.5m setting;To improve vehicle driving Safety.
Trestle panel 40 includes horizontal road 41 and inclination road 42, and horizontal road 41 is in dock arrangement with inclination road 42;Supporting Stake 10 distinguishes the horizontal road 41 of supporting with each stand column pile 20, and each 30 supporting of trestle stake tilts road 42, tilts road 42 and slope surface is suitable It connects to form joint ramp;The gradient for tilting road 42 is less than 1:8;Convenient for vehicle driving, transported outward convenient for the earthwork, meanwhile, avoid the gradient It is excessive, the stability of slight slope 50 is influenced, and cause to aggravate vehicle driving difficulty.
Horizontal road 41 includes approach zone and place, approach zone are converged to form connected region with place out out, connected region connection Tilt road 42;To save cost, inclination road 42 is traditionally arranged to be uniline channel;To accelerate the current consideration of dump truck, vehicle enters Approach zone marquis's vehicle, the vehicle for carrying soil are transported outward from place out, play shunting, while saving cost, reduce congested with cars; It is removed simultaneously convenient for subsequent closing slope and trestle.
The both ends in inclination road 42 are respectively equipped with inductor, and trestle panel 40 is equipped with attention gatter, when vehicle enters inclination road 42 When, attention gatter glows, and avoids vehicle meeting on inclination road 42, results in blockage;When tilting on road 42 without vehicle, attention gatter greening Light reminds vehicle that can enter inclination road 42.
Connected region is recessed downward forms automobile-washing groove 43, and automobile-washing groove 43 is arranged in up big and down small trapezoidal shape;Pass through carwash in this way Slot 43 before leaving the theatre to vehicle, is cleaned, and the pollution of road and the inconvenience of wheels travel are avoided.
Automobile-washing groove 43 is equipped with giant and water pump, and water pump extracts external water source, sprayed by giant, realizes vehicle Cleaning.
Giant is directed at vehicle tyre and vehicle body, is removed convenient for the sludge to wheel body.
After first road central shoring closure, after crown beam 70, attachment beam 60 and first road central shoring meet design requirement, then carry out down together The earth excavation of support.
Foundation pit successively excavates downwards, forms multilayer;Each layer of construction, is respectively provided with crown beam 70 and attachment beam 60, to crown beam 70, after attachment beam 60 meets design requirement, then lower layer's earth excavation is carried out.
Trestle stake 30 uses the following bored concrete pile in foundation pit bottom, is formed in conjunction with steel pipe post, facilitates the dismounting of later period trestle stake 30; Pile diameter, stake is long, enters rock depth, the technology ginseng of pile concrete label, pile body steel reinforcement cage arrangement of reinforcement and steel pipe post Number, is determined according to foundation pit scene formation condition and load by Structure Calculation.
The length of trestle panel 40 is to meet foundation pit annular brace earthwork construction space (excavator and the current item of dump truck Part) it determines, oblique table can be used according to foundation pit size, be circular layout.
The earthwork in foundation pit is excavated using subregion symmetrical expression balance, every layer of earth excavation from foundation pit periphery to foundation pit in the middle part of according to Secondary propulsion;Improve working security.
Slope surface compacting processing, and hardened;Slope surface is in 1:1.5 ratio slope, and gunite concrete slope protection;Shi Tupo 50 With enough support forces, guarantee the traveling of vehicle.
With extending downwardly for slight slope 50, piecewise construction reinforcement beam 31, the both ends of reinforcement 31 are in trestle stake 30 respectively It is connected and fixed arrangement;Each trestle stake 30 is set to form entirety.
Multiple reinforcing strips 32 are equipped between adjacent reinforcement 31, the both ends of reinforcing strip 32 are separately connected fixed adjacent reinforcement 31, reinforcing strip 32 is in interlaced arrangement two-by-two.
In step (6), closing slope initial stage is arranged more excavator relays and turns native entrucking on trestle panel 40 and foundation pit; Closing slope latter stage, excavator are in the tail end of trestle panel 40, complete clearing for slight slope 50 with excavator or high-front shovel.
The loading capacity of dump truck is suitably reduced when closing slope, and controls the travel speed of vehicle, to ensure that trestle is stable and goes Sail safety.
After all foundation pit earths are unearthed, trestle panel 40 is removed, steel pipe post stake 20 is recycled.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.

Claims (10)

1. annular method of excavation of deep foundation pit, which is characterized in that steps are as follows:
(1), construction supporting stake, multiple stand column pile and multiple trestle stakes respectively;
(2), first floor earth excavation, construct attachment beam and construction crown beam, forms the support pile with each stand column pile It is whole;
(3), trestle is constructed: pouring to form trestle panel, the support pile, each trestle stake and each stand column pile It is in respectively fixed and arranged with the trestle panel, and the support pile, each trestle stake and each stand column pile are divided Trestle panel described in other supporting;
(4), reserved slight slope excavates in lower layer, and the slight slope forms slope surface, and the slope surface is combined with trestle panel drop-over formation Ramp;
(5), the slight slope extends downwardly, up to earth excavation to foundation pit bottom;
(6), the earth excavation in foundation pit and outward transport finishes, gradually by the slight slope piecewise closing slope from bottom to up;
(7), trestle is removed.
2. annular method of excavation of deep foundation pit as described in claim 1, which is characterized in that the crown beam and the attachment beam Construction process are as follows: surveying setting-out → excavation groove → cut supporting pile head and clear up → bind crown beam reinforcing bar and connection joist steel Muscle → install crown beam template, connection beam forms → casting concrete → dismounting template and conserved.
3. annular method of excavation of deep foundation pit as claimed in claim 2, which is characterized in that the construct attachment beam and construction When the crown beam, one-piece casting is used with the trestle panel;Construction process are as follows: binding trestle reinforcing bar → mounting surface template die plate → Casting concrete, the template are placed in the top of the attachment beam.
4. annular method of excavation of deep foundation pit as claimed in any one of claims 1-3, which is characterized in that the trestle stake Construction process are as follows: preparation of construction → levelling of the land → embedded casing → drilling → end hole simultaneously a borehole cleaning → hangs steel reinforcement cage → peace Steel loading tube column and position → downcomer → secondary pile hole cleaning → perfusion that steel pipe post is corrected with steel reinforcement cage welded connecting → review Pile concrete.
5. annular method of excavation of deep foundation pit as claimed in any one of claims 1-3, which is characterized in that the trestle face Plate includes horizontal road and inclination road, and the horizontal road is in dock arrangement with the inclination road;The support pile with it is each described Stand column pile distinguishes horizontal road described in supporting, tilts described in each trestle stake supporting, the inclination road and the slope surface are suitable It connects to form joint ramp;The gradient in the inclination road is less than 1:8.
6. annular method of excavation of deep foundation pit as claimed in claim 5, which is characterized in that the horizontal road includes approach zone And place, the approach zone and the place out are converged to form connected region out, the connected region is connected to the inclination road.
7. annular method of excavation of deep foundation pit as claimed in any one of claims 1-3, which is characterized in that the soil in foundation pit Fang Caiyong subregion symmetrical expression balance is excavated, and every layer of earth excavation is successively promoted from foundation pit periphery to foundation pit middle part.
8. annular method of excavation of deep foundation pit as claimed in any one of claims 1-3, which is characterized in that the slope surface is rammed Crucial point reason, and hardened;The slope surface is in 1:1.5 ratio slope, and gunite concrete slope protection.
9. annular method of excavation of deep foundation pit as claimed in any one of claims 1-3, which is characterized in that with the soil Slope extends downwardly, piecewise construction reinforcement beam, and the both ends of the reinforcement are in respectively to be connected and fixed arrangement with the trestle stake.
10. annular method of excavation of deep foundation pit as claimed in any one of claims 1-3, which is characterized in that step (6) In, closing slope initial stage is arranged more excavator relays and turns native entrucking on the trestle panel and foundation pit;Closing slope latter stage excavates Machine is in the tail end of the trestle panel, completes clearing for slight slope with excavator or high-front shovel.
CN201910493741.0A 2019-06-06 2019-06-06 Annular method of excavation of deep foundation pit Pending CN110206034A (en)

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CN111705809A (en) * 2020-06-18 2020-09-25 深圳市蛇口招商港湾工程有限公司 Deep foundation pit construction structure and deep foundation pit construction method
WO2022016720A1 (en) * 2020-07-22 2022-01-27 深圳市工勘岩土集团有限公司 Temporary passage construction method employing support structure in deep foundation pit

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Publication number Priority date Publication date Assignee Title
CN111705809A (en) * 2020-06-18 2020-09-25 深圳市蛇口招商港湾工程有限公司 Deep foundation pit construction structure and deep foundation pit construction method
WO2022016720A1 (en) * 2020-07-22 2022-01-27 深圳市工勘岩土集团有限公司 Temporary passage construction method employing support structure in deep foundation pit

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