CN110258520A - A kind of construction method of underground continuous wall under the operating condition suitable for low clearance - Google Patents

A kind of construction method of underground continuous wall under the operating condition suitable for low clearance Download PDF

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Publication number
CN110258520A
CN110258520A CN201910535796.3A CN201910535796A CN110258520A CN 110258520 A CN110258520 A CN 110258520A CN 201910535796 A CN201910535796 A CN 201910535796A CN 110258520 A CN110258520 A CN 110258520A
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CN
China
Prior art keywords
construction
operating condition
low clearance
underground continuous
steel reinforcement
Prior art date
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Pending
Application number
CN201910535796.3A
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Chinese (zh)
Inventor
尚春阳
郭晓峰
李明
宋寿兵
张�廷
张宏波
郝红伟
赵硕
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RAILWAY TENTH GROUP NORTHWEST ENGINEERING
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RAILWAY TENTH GROUP NORTHWEST ENGINEERING
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Application filed by RAILWAY TENTH GROUP NORTHWEST ENGINEERING filed Critical RAILWAY TENTH GROUP NORTHWEST ENGINEERING
Priority to CN201910535796.3A priority Critical patent/CN110258520A/en
Publication of CN110258520A publication Critical patent/CN110258520A/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
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18Bulkheads or similar walls made solely of concrete in situ
    • E02D5/185Bulkheads or similar walls made solely of concrete in situ with flexible joint members between sections
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18Bulkheads or similar walls made solely of concrete in situ
    • E02D5/187Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints

Abstract

A kind of construction method of underground continuous wall under the operating condition suitable for low clearance; belong to construction method field, includes the following steps: that existing building reinforces isolation, location control, leads wall production, pipeline protection, the adjustment of diaphram wall framing, trenching construction, fabrication of reinforcing cage and hang, filling concrete.The construction method of the technical program offer diaphram wall; it effectively protects in surrounding building; construction is reduced to effect on building; reduce the influence to building site peripheral facility; back side leads wall reinforcing bar, and to be optimized for single layer unidirectional, abolishes convenient for the later period, reaches green construction section material target; grooving effect is detected in construction, improves the precision of grooving;Using recessed, wedge type steel reinforcement cage, joint position structure is complementary, easy to connect reliable;Only slurry iron sheet is installed additional in each connector, effectively prevents the generation streamed in work progress;Borehole cleaning is carried out to steel reinforcement cage before concreting, ensure that the intensity and reliability of concrete in work progress.

Description

A kind of construction method of underground continuous wall under the operating condition suitable for low clearance
Technical field
The invention belongs to the construction of diaphragm walls under construction method field more particularly to a kind of operating condition suitable for low clearance Method.
Background technique
With social development, subway construction is gradually accelerated, and wears low clearance bridge, cable under subway station, open cut section etc. The particular surroundings of equal structures building is more and more, and built environment becomes increasingly complex, and should meet safety, quality, work using one kind The construction method of the various aspects such as phase, cost meets design idea and design requirement, it is also desirable to overcome high rich water under low-headroom condition Sand-pebble layer underground continuous wall-enclosure structure constructional difficulties.Two-wheel groove milling is not flexible by the division of equipment limit continuous wall groove segment, Especially the second stage of slot section, is unsuitable for the structure there are pipeline, and plant maintenance is complicated and costly.What conventional diaphram wall used Chute forming machine is highly 10m, and steel reinforcement cage uses the two-shipper integral hoisting of 150t, 80t crawler crane, but there was only 6m in under-clearance, should Position routine continuous wall trench underground technique cannot achieve, and steel reinforcement cage can not integral hoisting.
Summary of the invention
The purpose of the present invention is to provide the construction method of underground continuous wall under a kind of operating condition suitable for low clearance, can solve Certainly under low clearance environment construction of diaphragm wall inconvenience problem.
Construction method of underground continuous wall under a kind of operating condition suitable for low clearance provided by the invention, includes the following steps: Existing building reinforces isolation, location control, leads wall production, pipeline protection, the adjustment of diaphram wall framing, trenching construction, reinforcing bar Cage makes and hangs, filling concrete.
Existing building reinforcing, which is isolated into, is arranged isolation pile between foundation pit and each building.
Preferably, pipeline protection is to wrap up pipeline with steel plate.
Preferably, it leads and leads the back side reinforcing bar of wall in wall production and be optimized for that single layer is unidirectional, and upstream face is double-layer double-direction.
Preferably, trenching construction step further includes grooving detection, detects into groove width, thickness, verticality.
Preferably, the steel reinforcement cage is recessed, wedge type steel reinforcement cage, and the steel reinforcement cage joint is spelled with recessed, wedge type counterpart It connects.
Preferably, before filling concrete step additional, only slurry iron sheet is installed to each connector.Only slurry thickness of scale is 0.7mm, width Spend 50cm, lap of splice 1m.
Preferably, before filling concrete step, borehole cleaning is carried out to steel reinforcement cage using gas lift reverse circulation mode, removes steel reinforcement cage Interior earthwork sediment.
Construction method provided by the invention have the advantages that the building in boundary of works area using isolation pile every From effectively protecting in surrounding building, reduce construction to effect on building;Using steel structure pair with to lead wall arranged in a crossed manner Pipeline provide and be effectively protected, reduce the influence to building site peripheral facility;Back side leads wall reinforcing bar and is optimized for single layer list To being abolished convenient for the later period, reach green construction section material target;Grooving effect is detected in construction, improves grooving Precision;Using recessed, wedge type steel reinforcement cage, joint position structure is complementary, easy to connect reliable;Only slurry iron sheet is installed additional in each connector, Effectively prevent the generation streamed in work progress;Borehole cleaning is carried out to steel reinforcement cage before concreting, ensure that and constructed The intensity and reliability of concrete in journey.
Detailed description of the invention
Fig. 1 is the construction method of underground continuous wall flow diagram provided by the invention suitable under low clearance operating condition.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Embodiment one
Construction method of underground continuous wall of the present invention suitable under low clearance operating condition, as shown in Fig. 1, step is such as Under:
Step 1. existing building reinforces isolation: being arranged between foundation pit and each buildingSteel pipe isolation pile 36 Root, totally 144.
Step 2. location control: in proposed diaphram wall periphery, line plate or control stake, line plate annotation center line are established Number, and it is high to survey bidding.
Step 3. leads wall production: excavating guide groove, manual amendment, back side leads wall reinforcing bar unidirectional, the upstream face that is optimized for single layer Reinforcing bar is double-layer double-direction.
Step 4. pipeline protection: it uses the pipeline changed can not be movedInteral fixation, steel plate use 20mm thickness.
The adjustment of step 5. diaphram wall framing: after construction of guide wall, drawing framing line on leading wall top face immediately, Indicate the volume of unit groove section.
Step 6. trenching construction: the SGL-40 low clearance hydraulic grooving that it is 6.5m that slot section, which excavates selection highly, narrow field, Distance is shorter, constructs from two sides to centre, and body refuse pond is arranged in ground, with digging machine cooperation environment-friendly vehicle transport.
Step 7. grooving detection: after grooving, with UDCM-100 grooving detector test at groove width, thickness, verticality.
The processing of step 8. steel reinforcement cage: it is boundary with pipeline, pipeline is adjusted to counterpart point position, steel reinforcement cage is made wedge on one side Shape is made into concave on one side, is spliced with two small size steel reinforcement cage counterparts.Personnel can be arranged to carry out steel reinforcement cage in Construction in Preparatory Stage Processing, to save the construction time, improves efficiency.
Step 9. steel plate connect merogenesis fabrication of reinforcing cage: steel reinforcement cage take overall processing merogenesis lift, merogenesis steel reinforcement cage it Between connection take reinforcement welding, speed of application is fast, and quality of connection is good.
Step 10. lifting: being lifted using 100t folding arm automobile, meet and walk under bridge, transports 4.5m steel reinforcement cage and slot section is spelled Connect integral hoisting.
Step 11. is anti-to stream working measure: fashioned iron connection is welded using groove, and fashioned iron weld sets twice and only starches iron sheet, Only slurry thickness of scale is 0.7mm, width 50cm, lap of splice 1m.
The replacement of step 12. connector case: not being available under conventional connector case bridge, with sand pocket replacement adaptor case, tests and determines choosing It takes the sand pocket of 0.018m to fill closely knit, prevents steel reinforcement cage from deviating.
Step 13. steel reinforcement cage borehole cleaning: it is long that steel reinforcement cage enters the slot time, and geology is in grittiness, sand-pebble layer, and sediment thickness is high Up to 0.5m, it is unsatisfactory for code requirement, gas lift reverse circulation is taken to carry out secondary pile hole cleaning.
Step 14. concreting: screwed connection formula conduit, junction rubber ring seal waterproof, every width are used Two conduits are arranged in lower diaphragm wall, and before pouring, water proof ball is placed in conduit.
The construction method of underground continuous wall being suitable under low clearance operating condition that the technical program provides, effectively protects Surrounding building reduces construction to effect on building;It is provided effectively using the steel structure pair pipeline arranged in a crossed manner with wall is led Protection, reduce the influence to building site peripheral facility;Back side leads wall reinforcing bar, and to be optimized for single layer unidirectional, abolishes convenient for the later period, Reach green construction section material target;Grooving effect is detected in construction, improves the precision of grooving;Using recessed, wedge Steel bar cage, joint position structure is complementary, easy to connect reliable;Only slurry iron sheet is installed additional in each connector, effectively prevents construction The generation streamed in the process;Borehole cleaning is carried out to steel reinforcement cage before concreting, ensure that the intensity of concrete in work progress And reliability.
Embodiment two
Under the operating condition of the present invention suitable for low clearance construction method of underground continuous wall, low clearance grooving equipment skill is applied Art, special small-sized gantry hang technology, bridge pier settles reinforcement technique, under-clearance guarantee technology, framing position pipeline protection technique, Merogenesis steel reinforcement cage processing technology, merogenesis reinforcing bar cage hoisting splicing, lap guard Flow Technique, connector case sandbag stone replacement technology, Secondary pile hole cleaning technology.Above-mentioned technology is applied in following technical process: small-sized gantry under introduction-bridge of low clearance chute forming machine The formulation hung-bridge decline soil guarantees that headroom-bridge pier steel pipe isolation pile reinforcing-construction of guide wall-framing positions pipeline protection skill Slurry-merogenesis fabrication of reinforcing cage-decomposition reinforcing bar cage hoisting-is changed at the clear bottom-of art-milling slot-ultrasound examination-brush wall- It decomposes steel reinforcement cage splicing-turbulent-flow-prevention measure-connector case and replaces measure-secondary pile hole cleaning-conduit installation-concreting.
Low clearance chute forming machine selects SGL-40 low clearance grab chute forming machine, is that Shanghai Jintai Engineering Machinery Co., Ltd. is autonomous Engineering equipment (conventional chute forming machine repacking version) is distinguishingly descended in research and development.
Since under-clearance limits, conventional vehicle, which is hung, can not lift merogenesis steel reinforcement cage, specific system one clear height 7m, clear span 6m The small across footpath gantry crane of 30t (meet and walk under bridge) facilitate steel reinforcement cage to enter slot along slot section direction attachment rail.
Equipment ground clearance about 6.5m, minimum clear height of constructing under viaduct is 6m, to guarantee operation side and to bridge Beam reserves certain safe distance, while reducing the influence to bridge pier, reduces 1.5m to road surface existing under bridge after comprehensively considering, applies Work elevated height meets grooving requirement and the safe distance to existing bridge to 7.5m.
Interval structure crust and bridge pier clear distance about 3.59m, 4.90m, 5.55m, 6.10m, are arranged between foundation pit and bridge pierSteel pipe isolation pile 144, bridge pier is reinforced, while monitoring the variation of bridge pier, data show no sedimentation.
All kinds of pipelines are generally had under the bridge of section in boundary of works area, mid-early stage can relocate and is changed to outside foundation pit, right It is moved in that can not change, using suspension protection, pipeline without surplus capacity, influences continuous wall trench underground and steel reinforcement cage installation mostly;Needle Mainly carried out by following measures to this problem: 1) it is 5m, chute forming machine grab bucket width that diaphram wall, which designs breadth, under bridge 2.8m repartitions diaphram wall breadth according to pipeline position, and width as far as possible adjusts pipeline position between 4-6m To diaphram wall seam crossing;2) can not avoid really, diaphram wall steel reinforcement cage is optimized, optimization method be with Pipeline is boundary, is spliced with two small size steel reinforcement cage counterparts, pipeline is adjusted to counterpart point position, and steel reinforcement cage makees wedgewise on one side, It is made into groove profile on one side, when descending reinforcing cage is spliced, and not only meets breadth, but also avoid pipeline.
The problem of diaphram wall steel reinforcement cage cannot achieve integral hoisting under bridge spells the 27m steel reinforcement cage of design on ground It is divided into 6 sections when dress, every section length 4.5m cuts steel reinforcement cage fashioned iron in boundary line position, and splice is used uniformly directly It is threadedly coupled in I grade of connector (100% same section), and a terminal filament head is processed (same to length sleeve) according to 1 times of length sleeve, it is another Normal process is held, forms length mantle fiber convenient for connection;
In reinforcing bar cage hoisting technique, using clear height 7m, the small across footpath gantry crane of the 30t of clear span 6m (meets and walks under bridge), by one The steel reinforcement cage of platform 25t truck crane cooperation transport 4.5m merogenesis is hoisted in underground continuous wall groove to gantry crane, then by gantry, is repeated The above process, until all hang load hole, the main reinforcement of each section steel reinforcement cage, reinforcing rib carry out straight thread docking, quantity in notch Greatly, control leakage screw thread is emphasis, is detected with torque spanner, and connector fashioned iron carries out groove welding.There is the width section of sound detecting pipe Equally merogenesis is taken to install, steel reinforcement cage merogenesis hoisting solves the problems, such as that diaphram wall steel reinforcement cage can not lift under bridge.
Influence adjacent width continuous wall trench underground is streamed when concreting in order to prevent, according to steel reinforcement cage merogenesis length, Fashioned iron connection is welded using groove, it is ensured that welding quality;In the only slurry iron sheet of H profile steel two sides installation 1m wide, fashioned iron weld If twice only starch iron sheet, lap of splice 1m;
Underground continuous wall connector is using rigid H profile steel connector, and Normal practice is blocked in H profile steel side erection joint case, connector The general length of case is 12m, is not available under bridge.It replaces in the present embodiment and fills out 2-3m depth rubble, remaining whole in slot bottom Being tamped with sand pocket prevents steel reinforcement cage from deviating and streaming.
Overpass descending reinforcing cage point 6 sections, every section steel reinforcement cage is mechanically connected into slot from being lifted to, most fast to need 45 minutes, Six sections all enter slot and need 4.5h, and conventional diaphram wall reinforcing bar cage hoisting is mostly in circle to the most fast 1.5h of slot, section is entered Gravel bed, middle layer of sand, sediment is thicker, ineffective by the secondary slurry that changes, and gas lift reverse circulation technology is taken to carry out secondary pile hole cleaning, scarfing cinder Speed is fast, and sediment thickness reduces, and guarantees quality, shortens the construction period, and reduces construction cost.

Claims (9)

1. the construction method of underground continuous wall under a kind of operating condition suitable for low clearance, including location control, lead wall production, underground connects Continuous wall framing adjustment, trenching construction, fabrication of reinforcing cage and hang, filling concrete the step of, it is characterised in that: in location control Isolation is reinforced to existing building in boundary of works area before step, to pipeline protection after leading wall and completing.
2. the construction method of underground continuous wall according to claim 1 suitable under low clearance operating condition, it is characterised in that: institute It states existing building reinforcing and is isolated into and isolation pile is set between foundation pit and each building.
3. the construction method of underground continuous wall according to claim 1 or 2 suitable under low clearance operating condition, feature exist In: the pipeline protection step is to wrap up pipeline with steel plate.
4. the construction method of underground continuous wall according to claim 3 suitable under low clearance operating condition, it is characterised in that: institute It states and leads the back side reinforcing bar for leading wall in wall production and be optimized for that single layer is unidirectional, and upstream face is double-layer double-direction.
5. the construction method of underground continuous wall according to claim 4 suitable under low clearance operating condition, it is characterised in that: institute Trenching construction step is stated, further includes grooving detection, detects into groove width, thickness, verticality.
6. the construction method of underground continuous wall according to claim 5 suitable under low clearance operating condition, it is characterised in that: institute It states fabrication of reinforcing cage and hangs in step, the steel reinforcement cage is recessed, wedge type steel reinforcement cage, and the steel reinforcement cage joint is with recessed, wedge type Counterpart is spliced.
7. the construction method of underground continuous wall according to claim 6 suitable under low clearance operating condition, it is characterised in that: institute Before stating filling concrete step additional, only slurry iron sheet is installed to each connector.
8. the construction method of underground continuous wall according to claim 7 suitable under low clearance operating condition, it is characterised in that: institute State only slurry thickness of scale be 0.7mm, width 50cm, lap of splice 1m.
9. the construction method of underground continuous wall according to claim 8 suitable under low clearance operating condition, it is characterised in that: institute Before stating filling concrete step, borehole cleaning is carried out to steel reinforcement cage using gas lift reverse circulation mode, removes earthwork sediment in steel reinforcement cage.
CN201910535796.3A 2019-06-20 2019-06-20 A kind of construction method of underground continuous wall under the operating condition suitable for low clearance Pending CN110258520A (en)

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CN201910535796.3A CN110258520A (en) 2019-06-20 2019-06-20 A kind of construction method of underground continuous wall under the operating condition suitable for low clearance

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Application Number Priority Date Filing Date Title
CN201910535796.3A CN110258520A (en) 2019-06-20 2019-06-20 A kind of construction method of underground continuous wall under the operating condition suitable for low clearance

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03250112A (en) * 1990-02-28 1991-11-07 Fujita Corp Continuous underground wall
CN105178288A (en) * 2015-07-31 2015-12-23 中铁隧道集团有限公司 Construction method of underground continuous wall below viaduct
CN108252296A (en) * 2018-01-19 2018-07-06 中铁上海工程局集团有限公司 A kind of method of diaphram wall pipeline in-situ conservation construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03250112A (en) * 1990-02-28 1991-11-07 Fujita Corp Continuous underground wall
CN105178288A (en) * 2015-07-31 2015-12-23 中铁隧道集团有限公司 Construction method of underground continuous wall below viaduct
CN108252296A (en) * 2018-01-19 2018-07-06 中铁上海工程局集团有限公司 A kind of method of diaphram wall pipeline in-situ conservation construction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨勇: ""浅谈超低净空双轮铣在轨道交通特殊工况中的应用"", 《江西建材》 *

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