CN104213564A - Excavation slope supporting structure and construction method thereof - Google Patents

Excavation slope supporting structure and construction method thereof Download PDF

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Publication number
CN104213564A
CN104213564A CN201410449139.4A CN201410449139A CN104213564A CN 104213564 A CN104213564 A CN 104213564A CN 201410449139 A CN201410449139 A CN 201410449139A CN 104213564 A CN104213564 A CN 104213564A
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China
Prior art keywords
hole
side slope
foundation pit
soil
spilled water
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Pending
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CN201410449139.4A
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Chinese (zh)
Inventor
金学胜
宋千军
程群
汪宗鹃
胡启文
史后义
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Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
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Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
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Application filed by Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd filed Critical Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
Priority to CN201410449139.4A priority Critical patent/CN104213564A/en
Publication of CN104213564A publication Critical patent/CN104213564A/en
Pending legal-status Critical Current

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Abstract

The invention provides an excavation slope supporting structure. The excavation slope supporting structure comprises a plurality of timber piles driven into soil along the bottom periphery of the excavation, two sets of moso bamboo piles driven into slopes surrounding the excavation, a plurality of drain holes embedded in the slopes, a first fine aggregate concrete layer ejected on the slope surface of the slope, a reinforcing mesh paved on the first fine aggregate concrete layer, and a second fine aggregate concrete layer ejected on the reinforcing mesh, wherein one set of the moso bamboo pile is driven into the slopes by being vertical to the slope surface of the slope, and the other set of the moso bamboo pile is driven into the slopes by being vertical to the horizontal surface; a filter screen is coated at the end part of the soil; a gravel filtering layer and a metal fence mesh coating the gravel filtering layer are arranged between the filter screen and the soil. The moso bamboo piles are used for strengthening the slope soil; under the condition of guaranteeing the stability of the soil, the operation is convenient, the materials are easily taken, the cost is low and the enterprise revenue is increased.

Description

A kind of foundation pit stope support structure and construction method
Technical field
The present invention relates to building engineering field, particularly relate to a kind of foundation pit stope support structure and construction method.
Background technology
It is a requisite operation in soil excavation process that side slope is gone along with sb. to guard him, the mode that side slope is gone along with sb. to guard him is varied, such as, natural slope, soil nail wall, composite soil nailing wall are gone along with sb. to guard him, wherein, the substantive requirements of form of going along with sb. to guard him of natural slope have larger space, place, and simultaneously higher to soil body quality requirement, applicability is not strong; It is better that composite soil nailing wall goes along with sb. to guard him effect, but construction cost is large, the slightly aobvious waste of, soil property good engineering more shallow for some cutting depths; Soil nail wall, as a kind of original position soil body reinforcement technology, can effectively be reinforced soil mass of foundation pit, does not produce the operating expenses of great number simultaneously, comparatively applicable for the good region of soil property.But, traditional reinforcing bar soil nail wall or steel tube for soil-nail wall excessive to steel use amount, not only cost is high, and does not meet national energy-saving and reduce discharging the requirement of policy.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the invention provides a kind of foundation pit stope support structure adopting mao bamboon stake to carry out soil stabilization, this supporting and protection structure when ensureing soil stabilization, easy to operate, be easy to draw materials, with low cost, increase the performance of enterprises.
For achieving the above object, the present invention adopts following technical scheme:
A kind of foundation pit stope support structure, comprising:
Some hole bottom perimeters along foundation ditch squeeze into the timber of the soil body;
The mao bamboon stake of side slope squeezed into by two covers, and wherein a set of mao bamboon stake is squeezed in described side slope perpendicular to the domatic of described side slope, and another set of mao bamboon stake is squeezed in described side slope perpendicular to horizontal plane;
Some spilled water holes be embedded in described side slope, wherein, the end that described spilled water hole imbeds the soil body is surrounded by screen pack, is provided with the metal hedge net of rubble filtration beds and coated described rubble filtration beds between described screen pack and the soil body;
Be injected in described side slope domatic on the first pea gravel concreten layer;
Be laid on the steel mesh reinforcement on described first pea gravel concreten layer; And
Be injected in the second pea gravel concreten layer on described steel mesh reinforcement.
Further, described supporting and protection structure also comprises the gutter, top, hole being arranged on described Foundation Pit top.
Further, described supporting and protection structure also comprises gutter at the bottom of the hole that the hole bottom perimeter along described foundation ditch arranges.
Preferably, described supporting and protection structure also comprises the joint bar on the top, hole of the described foundation ditch of some insertions.
Preferably, described spilled water hole is PVC spilled water hole.
The present invention provides a kind of foundation pit stope support construction method on the other hand, comprises the following steps:
Step S1, absolute altitude at the bottom of earthwork stage excavation to the hole of presetting, to form foundation ditch and to be positioned at the side slope of described foundation ditch surrounding;
Step S2, the hole bottom perimeter along described foundation ditch squeezes into some timbers;
Step S3, described side slope is squeezed into two cover mao bamboon stakes, and wherein a set of mao bamboon stake is squeezed in described side slope perpendicular to the domatic of described side slope, and another set of mao bamboon stake is squeezed in described side slope perpendicular to horizontal plane;
Step S4, described side slope buries some spilled water holes underground, and arranges screen pack in the end that described spilled water hole imbeds the soil body, and between described screen pack and the soil body, arrange the metal hedge net of rubble filtration beds and coated described rubble filtration beds;
Step S5, described side slope domatic on spray first floor pea gravel concreten;
Step S6, described first floor pea gravel concreten lays steel mesh reinforcement; And
Step S7, described steel mesh reinforcement sprays second layer pea gravel concreten.
Further, described step S1 be also included in described foundation ditch hole top arrange hole top gutter.
Further, the hole bottom perimeter that described step S1 also comprises along described foundation ditch arranges gutter, the end, hole.
Preferably, the spilled water hole in described step S4 is PVC spilled water hole.
Preferably, after described construction method is also included in and performs step S5 before step S6, some joint bars are entered at the hole tip cutting of described foundation ditch.
By technique scheme, the present invention has following beneficial effect: mao bamboon stake zero-emission in its life cycle, environmental protection, green and renewable, meets national energy-saving and reduces discharging policy; Mao bamboon stake substitutes steel as plate brad supporting material, has greatly saved steel, has reduced construction cost; Mao bamboon stake diameter is large and scab and branch, can increase the bond stress between itself and the soil body; Two cover mao bamboon stakes form staggered mao bamboon stake supporting mesh in slope soil, strengthen the stability of the soil body; When ensureing that upper side slope is stable, construction technology is simple, easy to operate.
Accompanying drawing explanation
Fig. 1 is the flow chart of foundation pit stope support method of the present invention;
Fig. 2 is the schematic diagram of the foundation pit stope support structure formed according to the method for Fig. 1;
Fig. 3 is that spilled water hole of the present invention buries schematic diagram underground;
Fig. 4 is the partial schematic diagram of steel mesh reinforcement of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, provide preferred embodiment of the present invention, and be described in detail.
Composition graphs 1-4, foundation pit stope support structure of the present invention comprises: some timbers 4 squeezing into the soil body along 1 periphery at the bottom of the hole of foundation ditch 10; The mao bamboon stake 51 and 52 of the side slope 2 of foundation ditch 10 surrounding squeezed into by two covers, wherein a set of mao bamboon stake 51 is squeezed in side slope 2 perpendicular to the domatic of side slope 2, another set of mao bamboon stake 52 is squeezed in side slope 2 perpendicular to horizontal plane, and in blossom type, distribution is arranged, to improve the stability of slope soil respectively in two cover mao bamboon stakes 51 and 52; Some spilled water holes 6 be embedded in side slope 2; Be arranged on the gutter, top, hole 31 on Foundation Pit top 3; Gutter 11 at the bottom of the hole that 1 periphery is arranged at the bottom of the hole of foundation ditch 10; The joint bar on some insertion Foundation Pit tops 3; Be injected in side slope domatic on the first pea gravel concreten layer 91; Be laid on the steel mesh reinforcement 8 on the first pea gravel concreten layer 91; And the second pea gravel concreten layer 92 be injected on steel mesh reinforcement 8.Wherein, spilled water hole 6 is PVC spilled water hole preferably, and as shown in Figure 3, the end that PVC spilled water hole 6 imbeds the soil body is surrounded by screen pack 61, is provided with the metal hedge net 63 of rubble filtration beds 62 and coated rubble filtration beds 62 between screen pack 61 and the soil body.
The construction method of above-mentioned supporting and protection structure comprises the following steps:
Step S0, design checking
Before soil excavation, report and design drawing are surveyed in base area, understand place geological condition (such as whether there is the complicated quality such as covered conduit, the dark pool in excavation of foundation pit scope), and determine excavation of foundation pit parameter (comprising the cohesion of the excavation of foundation pit degree of depth, clay distribution situation, soil layer moisture content and the soil body).When deep pit monitor grade is secondary, if adopt foundation pit stope support scheme, corresponding design checking should be provided, design checking should comprise support system and each component selection and layout, support unit design checking, analysis of foundation stability checks, underground water and surface water treatment design, construction technology, monitoring and technical requirements etc., finally determine foundation pit construction scheme.
Step S1, soil excavation
Soil excavation should be combined closely with hole sill stake, mao bamboon pile driving construction, and sequence of excavation, construction method should be consistent with design conditions, the requirement that supporting scheme must meet " advance support, stage excavation successively apply, and close in limited time, forbid to backbreak ".Before use foundation ditch is as foundation pit support construction, soil excavation is carried out according to being not more than 45 °, to form foundation ditch 10 and to be positioned at the side slope 2 of foundation ditch 10 surrounding, push up about 1.5m place to arrange gutter 31, top, hole carry out water conservancy diversion apart from slope on top 3, hole simultaneously, with prevent surface water wash away side slope 2 domatic and flow into foundation ditch 10, cause cave in accident.In addition, when soil excavation, must carry out by layer and section, vertical demixing every layer cutting depth is not more than 0.5m, should implement next procedure immediately after soil excavation, shortens side slope 2 open-assembly time as far as possible, after soil excavation to design elevation, gutter, the end 11, hole is set along the hole end 1 periphery, and collecting well (about every 20m arranges place's collecting well) is set along interval, gutter, the end 11, hole, enter side by side in municipal sink hole in time ponding to be pumped to top 3, hole.
Step S2, hole sill stake is reinforced
After soil excavation to design elevation, for preventing the lateral displacement of side slope 2 soil body, in hole, the end 1 periphery evenly squeezes into row's timber 4, timber 4 diameter is greater than 15cm (preferred 15cm-20cm), length is greater than 5m, and the spacing between adjacent timber 4 is less than 50cm, and in timber 4 injection process, utilize digging machine to coordinate, make timber 4 be pressed into the not little 4.5m of length of the hole end 1 soil body.
Step S3, mao bamboon stake is reinforced
After timber 4 injection, carry out supporting immediately to side slope 2, first carry out the setting-out work of mao bamboon stake gray line according to design drawing in precalculated position, gray line position meets quincunx, and spacing arranges rationally; Then squeeze into the mao bamboon stake 51 and 52 of two cover somes in side slope 2 equably by quincunx grey line position, wherein a set of mao bamboon stake 51 is squeezed in side slope 2 perpendicular to domatic, and another set of mao bamboon stake 52 is squeezed in side slope 2 perpendicular to horizontal plane.Utilizing mao bamboon stake 51 and 52 to replace steel herein not only makes construction of soil-nailed wall cost obviously reduce, and mao bamboon stake is as anchor pole, its diameter is large and scab, and effectively can solve the low problem of soft foundation rigidity, promote soil body stability, thus strengthen the integral rigidity of pattern foundation pit supporting structure.
Step S4, domatic spilled water hole is buried underground
While squeezing into mao bamboon stake, for guaranteeing effective eliminating of side slope 2 soil body internal water accumulation, it is made to keep lower moisture content, thus ensure the frictional force between the soil body and mao bamboon stake 51 and 52, to improve the resistance to overturning of side slope 2, at side slope 2 place, one PVC (polyvinyl chloride) spilled water hole 6 is set every a segment distance, and as shown in Figure 3, a screen pack 61 is surrounded by outside the end imbedding the soil body at this spilled water hole 6, and screen pack 61 and soil body intersection are provided with rubble filtration beds 62, between rubble filtration beds 62 and the soil body, are provided with metal hedge net 63.
Step S5, just spray first floor concrete
Mao bamboon stake 51 and 52 and spilled water hole 6 are buried underground after concealment acceptance is qualified, side slope 2 domatic on to be pushed up by slope spray first floor pea gravel concreten 91 at the bottom of slope, preferably, after soil excavation completes, 24h domestic demand sprays first floor concrete 91, and shotcrete technology need meet " concrete structure engineering construction technology standard " (DBJ/T 61-31-2005).
Step S6, assembling reinforcement net
Reinforced mesh uniform spreading good for blanking is located at first floor concrete surface, and the mesh spacing of steel mesh reinforcement 8 is preferably 250mm × 250mm.In addition, as shown in Figure 4, should local strengthening process be carried out at the steel mesh reinforcement at mao bamboon stake 51 and 52 and spilled water hole 6 place, such as, on the steel mesh reinforcement 8 at this place, weld well cabinet frame 9.
Step S7, sprays second layer concrete again
Steel mesh reinforcement colligation, after concealment acceptance is qualified, is pushed up by slope and on steel mesh reinforcement 8, spray second layer pea gravel concreten 92 at the bottom of slope.Shotcrete technology need meet " concrete structure engineering construction technology standard " (DBJ/T 61-31-2005).
Step S8, late maintaining
Between later concrete curing time, should take to water, spray watering, cover the measures such as watering and carry out concrete curing.
In addition, in a preferred embodiment, method of the present invention is also included in and performs after step S5 before step S6, joint bar 7 is inserted on top, the hole of foundation ditch 10 3, and this joint bar 7 length is not less than 1m, the spacing of adjacent two joint bars 7 is not more than 1.5m, with the further firm soil body.
Above-mentioned construction method is applicable to the soil excavation degree of depth and is not more than 6 meters, and soil layer cohesion is greater than the construction of the weak soil of 10Kpa or foundation ditch 10 bracing engineering of ultra-soft soil layer.
Supporting and protection structure of the present invention and method only need long-armed digging machine to be engaged in side slope surface and squeeze into mao bamboon stake in work progress, greatly reduce difficulty of construction, mao bamboon material is easy to gather materials on the spot, and Bamboo Growth is fast, cultivation is cultivated by force, easily, substitute tube material with mao bamboon and meet national green construction policy, and bracing of foundation pit is effective, while reducing construction cost, ensure construction quality.Under the examination of Quality Supervision Station and management, construction molding quality meets the requirement of design and construction inspection rules, and organoleptic quality is outstanding, and repair rate is low.
Above-described, be only preferred embodiment of the present invention, and be not used to limit scope of the present invention, the above embodiment of the present invention can also make a variety of changes, and such as motor drives and can change handwheel driving into.Namely every claims according to the present patent application and description are done simple, equivalence change and modify, and all fall into claims of the present invention.

Claims (10)

1. a foundation pit stope support structure, is characterized in that, this supporting and protection structure comprises:
Some hole bottom perimeters along foundation ditch squeeze into the timber of the soil body;
The mao bamboon stake of side slope squeezed into by two covers, and wherein a set of mao bamboon stake is squeezed in described side slope perpendicular to the domatic of described side slope, and another set of mao bamboon stake is squeezed in described side slope perpendicular to horizontal plane;
Some spilled water holes be embedded in described side slope, wherein, the end that described spilled water hole imbeds the soil body is surrounded by screen pack, is provided with the metal hedge net of rubble filtration beds and coated described rubble filtration beds between described screen pack and the soil body;
Be injected in described side slope domatic on the first pea gravel concreten layer;
Be laid on the steel mesh reinforcement on described first pea gravel concreten layer; And
Be injected in the second pea gravel concreten layer on described steel mesh reinforcement.
2. foundation pit stope support structure according to claim 1, is characterized in that, described supporting and protection structure also comprises the gutter, top, hole being arranged on described Foundation Pit top.
3. foundation pit stope support structure according to claim 1, is characterized in that, described supporting and protection structure also comprises gutter at the bottom of the hole that the hole bottom perimeter along described foundation ditch arranges.
4. foundation pit stope support structure according to claim 1, is characterized in that, described supporting and protection structure also comprises the joint bar on the top, hole of the described foundation ditch of some insertions.
5. foundation pit stope support structure according to claim 1, is characterized in that, described spilled water hole is PVC spilled water hole.
6. a foundation pit stope support construction method, is characterized in that, comprises the following steps:
Step S1, absolute altitude at the bottom of earthwork stage excavation to the hole of presetting, to form foundation ditch and to be positioned at the side slope of described foundation ditch surrounding;
Step S2, the hole bottom perimeter along described foundation ditch squeezes into some timbers;
Step S3, described side slope is squeezed into two cover mao bamboon stakes, and wherein a set of mao bamboon stake is squeezed in described side slope perpendicular to the domatic of described side slope, and another set of mao bamboon stake is squeezed in described side slope perpendicular to horizontal plane;
Step S4, described side slope buries some spilled water holes underground, and arranges screen pack in the end that described spilled water hole imbeds the soil body, and between described screen pack and the soil body, arrange the metal hedge net of rubble filtration beds and coated described rubble filtration beds;
Step S5, described side slope domatic on spray first floor pea gravel concreten;
Step S6, described first floor pea gravel concreten lays steel mesh reinforcement; And
Step S7, described steel mesh reinforcement sprays second layer pea gravel concreten.
7. foundation pit stope support construction method according to claim 6, is characterized in that, the top, hole that described step S1 is also included in described foundation ditch arranges gutter, top, hole.
8. foundation pit stope support construction method according to claim 6, is characterized in that, the hole bottom perimeter that described step S1 also comprises along described foundation ditch arranges gutter, the end, hole.
9. foundation pit stope support construction method according to claim 6, is characterized in that, the spilled water hole in described step S4 is PVC spilled water hole.
10. foundation pit stope support construction method according to claim 6, is characterized in that, after described construction method is also included in and performs step S5 before step S6, enters some joint bars at the hole tip cutting of described foundation ditch.
CN201410449139.4A 2014-09-04 2014-09-04 Excavation slope supporting structure and construction method thereof Pending CN104213564A (en)

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN104895087A (en) * 2015-06-12 2015-09-09 中国化学工程第七建设有限公司 Chemical powder soil texture deep foundation pit construction method
CN106592607A (en) * 2017-03-13 2017-04-26 中国十七冶集团有限公司 Steel bar embedding, net hanging and guniting supporting construction method of deep foundation pit
CN106869131A (en) * 2017-02-21 2017-06-20 浙江水利水电学院 A kind of construction method of stone surface spray shield concrete
CN106906817A (en) * 2017-02-21 2017-06-30 浙江水利水电学院 A kind of method of utilization concrete filling block crack of stone gap
CN106930299A (en) * 2017-02-21 2017-07-07 浙江水利水电学院 A kind of concrete half fills block stone construction method
CN107419737A (en) * 2017-08-25 2017-12-01 中铁建设集团有限公司 A kind of steel tube for soil-nail slope retaining structure and method
CN108824466A (en) * 2018-06-02 2018-11-16 北京泽通水务建设有限公司 A kind of foundation pit side-wall water burst gushes the processing method of sand
CN108914944A (en) * 2018-07-27 2018-11-30 中国冶集团有限公司 Shoal high water level pipeline Support of Foundation Pit Excavation precipitation system and construction method
CN110258584A (en) * 2019-06-20 2019-09-20 中国建筑第八工程局有限公司 Excavation slope soil nailing pipe walled protection structure and construction method
CN111472370A (en) * 2020-04-24 2020-07-31 梁维靖 Slope collapse prevention structure for expressway and construction method thereof
CN114892675A (en) * 2022-05-30 2022-08-12 浙江文华建设项目管理有限公司 Foundation pit supporting structure with foundation pit construction parameter measuring function
CN115162347A (en) * 2022-08-25 2022-10-11 中国建筑第二工程局有限公司 Deep foundation pit pipe network construction process
CN115387361A (en) * 2022-08-09 2022-11-25 广东中岩岩土工程技术开发有限公司 Tunnel start and stop point foundation pit construction method for water-rich soil layer

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CN201245846Y (en) * 2008-08-14 2009-05-27 杭州南方土木工程咨询有限公司 Clamshell excavator stirring concrete enclosure wall
CN101457530A (en) * 2008-12-25 2009-06-17 归真 Displacement prevention retaining wall and construction method thereof
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Publication number Priority date Publication date Assignee Title
CN104895087A (en) * 2015-06-12 2015-09-09 中国化学工程第七建设有限公司 Chemical powder soil texture deep foundation pit construction method
CN104895087B (en) * 2015-06-12 2017-01-25 中国化学工程第七建设有限公司 Chemical powder soil texture deep foundation pit construction method
CN106906817B (en) * 2017-02-21 2019-02-26 浙江水利水电学院 A method of utilizing concrete filling block crack of stone gap
CN106930299B (en) * 2017-02-21 2019-04-09 浙江水利水电学院 A kind of half filling block stone construction method of concrete
CN106906817A (en) * 2017-02-21 2017-06-30 浙江水利水电学院 A kind of method of utilization concrete filling block crack of stone gap
CN106930299A (en) * 2017-02-21 2017-07-07 浙江水利水电学院 A kind of concrete half fills block stone construction method
CN106869131A (en) * 2017-02-21 2017-06-20 浙江水利水电学院 A kind of construction method of stone surface spray shield concrete
CN106869131B (en) * 2017-02-21 2018-10-09 成龙建设集团有限公司 A kind of construction method of stone surface spray shield concrete
CN106592607A (en) * 2017-03-13 2017-04-26 中国十七冶集团有限公司 Steel bar embedding, net hanging and guniting supporting construction method of deep foundation pit
CN107419737A (en) * 2017-08-25 2017-12-01 中铁建设集团有限公司 A kind of steel tube for soil-nail slope retaining structure and method
CN108824466A (en) * 2018-06-02 2018-11-16 北京泽通水务建设有限公司 A kind of foundation pit side-wall water burst gushes the processing method of sand
CN108914944A (en) * 2018-07-27 2018-11-30 中国冶集团有限公司 Shoal high water level pipeline Support of Foundation Pit Excavation precipitation system and construction method
CN110258584A (en) * 2019-06-20 2019-09-20 中国建筑第八工程局有限公司 Excavation slope soil nailing pipe walled protection structure and construction method
CN110258584B (en) * 2019-06-20 2024-01-30 中建八局科技建设有限公司 Foundation pit side slope soil nailing pipe wall enclosure structure and construction method
CN111472370B (en) * 2020-04-24 2021-06-11 梁维靖 Slope collapse prevention structure for expressway and construction method thereof
CN111472370A (en) * 2020-04-24 2020-07-31 梁维靖 Slope collapse prevention structure for expressway and construction method thereof
CN114892675A (en) * 2022-05-30 2022-08-12 浙江文华建设项目管理有限公司 Foundation pit supporting structure with foundation pit construction parameter measuring function
CN114892675B (en) * 2022-05-30 2024-03-26 文华工程咨询股份有限公司 Foundation pit supporting structure with function of measuring foundation pit construction parameters
CN115387361A (en) * 2022-08-09 2022-11-25 广东中岩岩土工程技术开发有限公司 Tunnel start and stop point foundation pit construction method for water-rich soil layer
CN115387361B (en) * 2022-08-09 2023-08-11 广东中岩岩土工程技术开发有限公司 Tunnel start-stop foundation pit construction method for water-rich soil layer
CN115162347A (en) * 2022-08-25 2022-10-11 中国建筑第二工程局有限公司 Deep foundation pit pipe network construction process

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Application publication date: 20141217