CN110939463B - Movable full-section integral steel mould lining trolley and application thereof in pumping pouring of secondary lining concrete - Google Patents
Movable full-section integral steel mould lining trolley and application thereof in pumping pouring of secondary lining concrete Download PDFInfo
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- CN110939463B CN110939463B CN201911145350.6A CN201911145350A CN110939463B CN 110939463 B CN110939463 B CN 110939463B CN 201911145350 A CN201911145350 A CN 201911145350A CN 110939463 B CN110939463 B CN 110939463B
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- 239000004567 concrete Substances 0.000 title claims abstract description 121
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000005086 pumping Methods 0.000 title claims abstract description 10
- 239000011376 self-consolidating concrete Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims description 25
- 229920005989 resin Polymers 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000003094 microcapsule Substances 0.000 claims description 19
- 238000004062 sedimentation Methods 0.000 claims description 18
- 239000002250 absorbent Substances 0.000 claims description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 235000019738 Limestone Nutrition 0.000 claims description 9
- 239000006028 limestone Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 239000011325 microbead Substances 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000006229 carbon black Substances 0.000 claims description 4
- 238000004132 cross linking Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000011258 core-shell material Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 21
- 238000010276 construction Methods 0.000 abstract description 18
- 239000011800 void material Substances 0.000 abstract description 8
- 239000004033 plastic Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 238000005056 compaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- TXTCTCUXLQYGLA-UHFFFAOYSA-L calcium;prop-2-enoate Chemical compound [Ca+2].[O-]C(=O)C=C.[O-]C(=O)C=C TXTCTCUXLQYGLA-UHFFFAOYSA-L 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010669 acid-base reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a movable full-section integral steel mould lining trolley and application thereof in pumping pouring secondary lining concrete; according to the invention, on the basis of the symmetrical warehousing construction process of the traditional tunnel secondary lining structure concrete, the bottom of the trolley template is provided with the vent holes, the normal concrete and the self-compacting concrete are poured in a layered manner at one time, so that the technical problem of local exposed ribs caused by the uncompacted filling of the bottom concrete is solved, the problem of vault void caused by self-settlement shrinkage and larger self-shrinkage of the traditional tunnel secondary lining structure concrete is solved, and the construction quality and the service performance of the mountain tunnel secondary lining structure concrete are finally improved.
Description
Technical Field
The invention relates to a construction process of concrete with a secondary lining structure, in particular to a movable full-section integral steel mould lining trolley and application thereof in pumping pouring of the secondary lining concrete.
Background
The tunnel is an engineering structure built underground and is widely applied to the related fields of mines, water conservancy, traffic, national defense and the like. The mountain tunnel adopts the mining method to undercut the tunnel in the work progress, often can be because of reasons such as secondary lining pouring is not full or secondary lining concrete shrink between primary support and secondary lining, is very easy in the problem that the concrete pouring is not closely knit, vault concrete void appears. The second lining of the tunnel is a reinforced concrete lining structure with a certain thickness which is constructed on the basis of the first lining of the tunnel after the construction of the first lining of the tunnel is completed.
The second lining of the tunnel is a main engineering for tunnel construction, has the function of bearing the soil pressure around the tunnel and preventing surrounding rock from slumping, and the cavity generated by the second lining of the tunnel can greatly influence the quality of the tunnel.
Along with the continuous improvement of engineering quality and standardized construction requirements, two lining concrete in tunnel construction are supported by adopting a trolley steel mould, self-compacting concrete is pumped to a pouring opening through a ground pump and poured into a warehouse for one-time molding, and different warehousing modes are selected to have certain influence on the self-compacting concrete pouring process and the structure molding effect. The concrete storage mode mainly comprises three modes: the first warehouse entry mode is to pour holes from the bottom of the trolley template and then to pour Kong Jiaozhu from the top; the second warehouse entry mode is to symmetrically pour from waist observation windows on two sides of the trolley template, and then to pour Kong Jiaozhu on the top; the third way of putting in the warehouse is to put the concrete in the warehouse Kong Jiaozhu directly from the top, and the pouring port is not replaced.
The practice shows that the self-compacting concrete for the secondary lining structure of the tunnel has certain influence on the quality of the formed secondary lining concrete of the tunnel by three concrete pouring modes.
The first warehouse entry mode needs larger pumping pressure in the bottom extrusion casting process, has high requirement on pumping equipment, and is easy to cause self-compacting concrete to generate layering in the extrusion process so as to cause cold joints of a hardened concrete structure and influence the permeability of the secondary lining concrete of the tunnel;
the second type of warehouse entry belongs to symmetrical pouring, and the concrete in warehouse entry at two sides is not beneficial to air discharge at the bottom of the template, so that the problems of more bottom concrete bubbles, partial packing incompact, exposed steel bars and the like are easily caused, and the quality of a secondary lining concrete structure of a tunnel is influenced;
the third type of warehousing mode also belongs to symmetrical pouring, and the concrete in the symmetrical warehousing of both sides has high requirements on the exhaust performance of the bottom template, otherwise the problems of uncompacted bottom concrete pouring and the like can be generated, and the concrete has larger drop when directly pouring from the top, so that the self-compacting concrete is easy to separate, and the appearance quality and the solid structure quality of the secondary lining concrete of the tunnel are influenced.
Through the research of tunnel secondary lining engineering of pouring self-compaction concrete in a full bin, the self-compaction concrete cementing material dosage is large, the water-cement ratio is low, the self-shrinkage generated in the closed space of the tunnel secondary lining is large, in addition, the self-compaction concrete coarse aggregate is less, the fine aggregate is more, the fluidity is large, the large settlement shrinkage is easily generated during the disposable full bin pouring in the space of the tunnel secondary lining, and the vault void phenomenon is easily generated after the pouring and forming of the tunnel secondary lining concrete due to the superposition of the self-shrinkage and the settlement shrinkage. The existence of the void can lead the lining to generate bending stress, change the stress uniformity of the lining, weaken the supporting capability of the secondary lining concrete, seriously influence the safety of the tunnel and cause huge potential safety hazard.
Disclosure of Invention
Aiming at the defect that the bottom of a self-compaction concrete molding tunnel secondary lining concrete is not compact, a vault is empty and the like, which affect the quality of the concrete, of the existing mountain tunnel secondary lining structure by utilizing a trolley supporting mould, the invention provides a movable full-section integral steel mould lining trolley and application thereof in pumping pouring secondary lining concrete; the problem of current concrete subsides shrinkage and self-contraction great vault void that causes is solved, the technical problem of the local dew muscle that the uncompacted appearance of bottom concrete filling was solved.
The invention relates to a movable full-section integral steel mould lining trolley, which consists of an external arch steel mould plate, a bottom steel mould plate, two lining steel mould plates and trolley shifting rollers; the outer arch steel template is connected with the two lining steel templates through supporting movable pins; the displacement roller moves along the track direction; pouring holes and observation windows are formed in the middle position of the top of the outer arch steel template and the middle position of the waist parts of the two sides of the outer arch steel template; the middle of the bottom plate steel template is provided with exhaust holes along the travelling direction of the trolley, and the distance between the exhaust holes is about 3-4 meters; the shifting roller is arranged at the bottom of the lining steel template and is telescopic.
The pouring holes of the waist steel templates of the two side walls of the movable full-section integral steel mold lining trolley are symmetrically arranged, and observation windows are arranged beside the pouring holes.
The exhaust hole is provided with a sealing cover.
The pouring holes are provided with sealing covers.
The observation window is provided with a sealing cover.
The movable full-section integral steel mould lining trolley must be selected according to the clearance size in the tunnel, and the steel structure and the steel mould must have enough strength.
The movable full-section integral steel mould lining trolley is assembled to complete a vault steel mould plate before a tunnel hole, then the movable full-section integral steel mould lining trolley enters the tunnel along the depth direction of a mountain tunnel, the track center and elevation of the movable full-section integral steel mould lining trolley are adjusted, the trolley displacement roller is retracted, the center line of the vault steel mould plate coincides with the center of the two lining steel mould plates as much as possible, and then the bottom steel mould plate of the movable full-section integral steel mould lining trolley is paved according to the center line and the elevation, so that the movable full-section integral steel mould lining trolley is in a good stress state in the concrete pouring process. The concrete pouring is symmetrically performed in a left-right layering mode, so that the movable full-section integral steel mould lining trolley is prevented from shifting.
The application of the movable full-section integral steel mould lining trolley is applied to the pumping pouring of tunnel concrete. The mountain tunnel arch wall and the bottom plate secondary lining are poured by adopting the movable full-section integral steel mould lining trolley to pump concrete for integral pouring so as to ensure the compactness of the secondary lining structure concrete.
The application of the movable full-section integral steel mould lining trolley specifically comprises the following steps:
step one, opening all sealing covers of pouring holes, observation windows and exhaust holes;
connecting a concrete pump pipe with pouring holes at two sides of the waist of the trolley template, symmetrically pouring concrete from two sides of the trolley template until the overflow of the bottom vent hole is obvious, removing the excessive overflow of the slurry, and closing a bottom vent hole sealing cover;
continuously pouring concrete until the liquid level of the concrete rises to the waist observation window position of the trolley template, stopping pouring when the liquid level differences at two sides of the template are basically consistent, taking out a concrete pump pipe, and closing a waist pouring hole and an observation window sealing cover;
and fourthly, connecting the concrete pump pipe with a pouring hole at the top of the trolley template, continuing pouring concrete, and closing a sealing cover of the top observation window until pouring is completed when the liquid level of the concrete approaches to the top observation window.
In order to further obtain compact secondary lining concrete, the anti-sedimentation concrete is used in the pouring process of the structure according to different application scenes. One is ordinary anti-sedimentation concrete; one is self-compacting anti-settling concrete.
The common anti-sedimentation concrete consists of the following components in parts by mass: 180-200 parts of 42.5 ordinary Portland cement, 100-120 parts of microbeads, 50-60 parts of limestone powder, 30-35 parts of calcium oxide expanding agent, 600-650 parts of river sand with the fineness modulus of 2.5, 200-250 parts of 5 mm-10 mm continuous graded broken stone, 550-600 parts of 10 mm-25 mm continuous graded broken stone, 150-160 parts of mixing water and 4-6 parts of water reducer;
the microbeads are solid aluminosilicate fine powder with global continuous particle size distribution, and the global particle shape with the continuous particle size distribution ensures that the microbeads have excellent ball effect, so that the concrete has excellent fluidity and filling compactness, and the self-shrinkage of the concrete is reduced; the microbeads are rich in a large amount of active SiO 2 And active Al 2 O 3 Can be used with CaO and CaCO in cement concrete 3 、Ca(OH) 2 The volcanic ash is generated to react to generate a large amount of adhesive substances, and the traction resistance is generated to reduce the sedimentation shrinkage of the concrete.
The self-compacting anti-sedimentation concrete consists of the following components in parts by weight: 200-220 parts of 42.5 ordinary Portland cement, 100-120 parts of limestone powder, 80-100 parts of fly ash, 20-25 parts of white carbon black, 50-60 parts of a calcium oxide expanding agent, 10-15 parts of microcapsule water-absorbent resin, 750-800 parts of river sand with the fineness modulus of 2.5, 900-950 parts of 5 mm-15 mm broken stone, 130-140 parts of mixing water and 7-8 parts of a water reducer.
The microcapsule water-absorbing resin is prepared by taking high water-absorbing resin synthesized by acrylic acid with low crosslinking degree and salt thereof as a core and polylactic acid with high crosslinking degreeThe microcapsule is made into a 'shell' structure, and the microcapsule has a time-delay hydrolysis characteristic in an alkaline environment, so that the water-absorbent resin in the microcapsule is released by hydrolysis and shell breaking after the concrete pouring is finished, and the workability of the microcapsule-doped water-absorbent resin concrete is ensured; the water-absorbent resin has the characteristics of quick water absorption and slow release, and after the microcapsule is broken, the water-absorbent resin in the microcapsule quickly absorbs water to generate volume expansion, so that on one hand, the slurry content of the self-compacting concrete is obviously increased, and on the other hand, the free water content of the self-compacting concrete in the early stage is reduced, and the settlement shrinkage of the self-compacting concrete in the plastic stage is reduced. The free water in the water-absorbent resin is slowly released along with hydration to compensate the hydration water shortage phenomenon of the self-compacting concrete, so that the self-shrinkage of the self-compacting concrete is effectively reduced. Furthermore, the main component of the water-absorbent resin, namely acrylic acid, is easy to combine with CaO and CaCO in self-compacting concrete in the process of water absorption and hydrolysis 3 、Ca(OH) 2 The acid-base reaction is generated to generate the crosslinked calcium acrylate, so that the calcium acrylate has stronger bonding resistance, and the sedimentation shrinkage phenomenon of self-compacting concrete caused by the rising of aggregate descending slurry due to higher fluidity is effectively prevented. Therefore, the mixing of the microcapsule water-absorbing resin can reduce the sedimentation shrinkage of the concrete while reducing the self shrinkage of the concrete, and effectively solves the problems of sedimentation shrinkage of the concrete of the mountain tunnel secondary lining structure and vault void caused by larger self shrinkage.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
according to the invention, the optimization and improvement of the traditional tunnel secondary lining concrete symmetrical warehousing process are realized, and the exhaust holes are arranged in the middle of the bottom of the trolley template along the travelling direction of the trolley, so that the exhaust problem of symmetrical warehousing concreting in the process of meeting the template bottom plate is remarkably improved, and the phenomena of exposed ribs and partial non-compaction caused by untimely bottom exhaust are reduced.
On the basis of the construction process of symmetrical in-house concrete of the waist of the traditional tunnel secondary lining structure, the invention uses the trolley waist observation window as a boundary, changes the common self-compacting concrete from the waist to the bottom plate into normal concrete, and reduces the settlement shrinkage of the normal concrete as far as possible through the normal concrete mixing ratio designed by the close-packed theory of medium coarse river sand, small particle broken stone and large particle broken stone; the self-shrinkage of the normal concrete in the closed space of the tunnel secondary lining is improved through the self-generated volume expansion characteristic of the calcium oxide expanding agent; through the ball effect and the pozzolanic effect of a large amount of microbeads in the cementing material, the flowability and the filling performance of the concrete pouring process are ensured on the premise that the slump of the concrete in the warehouse is 160-180mm, and the sedimentation shrinkage of the concrete is effectively reduced.
According to the preparation method of the traditional tunnel secondary lining self-compacting concrete, the delayed hydrolysis characteristic of the microcapsule water-absorbent resin is adopted, the microcapsule water-absorbent resin is doped in the process of preparing the self-compacting concrete, the working performance within one hour is not affected, the concrete can meet the construction requirements of high fluidity and high expansion, after the microcapsule is hydrolyzed and broken, the water-absorbent resin begins to rapidly absorb water and expand to become large, the slurry content in the self-compacting concrete is increased, the hydrolyzed water-absorbent resin reacts with calcium ions in cement, limestone and an expanding agent to generate crosslinked calcium acrylate with strong bonding resistance, the friction force between the water-absorbent resin and coarse and fine aggregates is improved, and the sedimentation shrinkage of the self-compacting concrete in a plastic stage is effectively reduced. In addition, as hydration progresses, the internal humidity of the self-compacting concrete becomes lower, self-shrinkage begins to occur, and the water-absorbent resin reversely releases free water to react with the large amount of calcium oxide expanding agent in the water-absorbent resin to produce continuous self-generated volume expansion to compensate the self-shrinkage of the self-compacting concrete. By compounding the microcapsule water-absorbent resin and the high-doped calcium oxide expanding agent, the settlement shrinkage and self-shrinkage of the self-compacting concrete of the traditional tunnel secondary lining are obviously improved, and the vault void caused by the settlement shrinkage and self-shrinkage of the self-compacting concrete in the one-time pouring process of the trolley formwork is reduced.
On the basis of the traditional tunnel secondary lining construction process, the invention uses the trolley waist observation window as a boundary, normal concrete is poured from the position below the waist to the bottom plate, self-compacting concrete is poured from the position above the waist to the top, and the settlement shrinkage and the self-shrinkage of the tunnel secondary lining concrete are obviously reduced by combining the two concretes, so that the problem of vault void in the one-time pouring process of the trolley formwork is effectively solved.
Drawings
Fig. 1: and a construction process flow chart of a mountain tunnel secondary lining structure.
Drawing of the figure 2: the structure of the trolley template is schematically shown. Wherein 1 is a lining trolley, 2 is a trolley supporting movable pin, 3 is a trolley two-lining steel template, 4 is a trolley shifting roller (retractable and resettable), 5 is a trolley bottom template exhaust hole, 6 is a trolley waist template observation window, 7 is a trolley waist template pouring hole, 8 is a trolley top template observation window and 9 is a trolley top template pouring hole.
Description of the embodiments
For a better understanding of the present invention, the following further illustrates the contents of the present invention in connection with concrete preparation of a concrete structure of a mountain tunnel and its construction process examples.
A movable full-section integral steel mould lining trolley comprises an outer arch steel mould plate, a bottom steel mould plate, two lining steel mould plates and trolley shifting rollers; the outer arch steel template is connected with the two lining steel templates through supporting movable pins; the displacement roller moves along the track direction; pouring holes and observation windows are formed in the middle position of the top of the outer arch steel template and the middle position of the waist parts of the two sides of the outer arch steel template; the middle of the bottom plate steel template is provided with exhaust holes along the travelling direction of the trolley, and the distance between the exhaust holes is about 3-4 meters; the shifting roller is arranged at the bottom of the lining steel template and is telescopic.
Concrete preparation examples of the secondary lining structure of a mountain tunnel are described.
Examples
The construction process of the mountain tunnel secondary lining structure concrete comprises the following steps:
step one, opening all sealing covers of pouring holes, observation windows and exhaust holes;
connecting a concrete pump pipe with pouring holes at two sides of the waist of the trolley template, symmetrically pouring concrete from two sides of the trolley template until the overflow of the bottom vent hole is obvious, removing the excessive overflow of the slurry, and closing a bottom vent hole sealing cover;
continuously pouring concrete until the liquid level of the concrete rises to the waist observation window position of the trolley template, stopping pouring when the liquid level differences at two sides of the template are basically consistent, taking out a concrete pump pipe, and closing a waist pouring hole and an observation window sealing cover;
and fourthly, connecting the concrete pump pipe with a pouring hole at the top of the trolley template, continuing pouring concrete, and closing a sealing cover of the top observation window until pouring is completed when the liquid level of the concrete approaches to the top observation window.
The normal concrete provided for the construction process step four of the embodiment consists of the following components in parts by mass: 180 parts of 42.5 ordinary Portland cement, 120 parts of microbeads, 50 parts of limestone powder, 30 parts of calcium oxide expanding agent, 650 parts of river sand with the fineness modulus of 2.5, 250 parts of 5 mm-10 mm continuous graded broken stone, 600 parts of 10 mm-25 mm continuous graded broken stone, 160 parts of mixing water and 4 parts of water reducer. The slump of the concrete is 170mm, and the plastic sedimentation rate is 0.010% when the concrete is finally set after being put in the warehouse, which is obviously smaller than that of the common concrete.
The self-compacting concrete provided for the construction process of the embodiment comprises the following components in parts by mass: 42.5 parts of ordinary Portland cement 200 parts, limestone powder 120 parts, fly ash 100 parts, white carbon black 25 parts, a calcium oxide expanding agent 60 parts, a microcapsule water-absorbing resin 15 parts, river sand 750 parts with fineness modulus of 2.5, 5 mm-15 mm broken stone 950 parts, mixing water 140 parts and a water reducing agent 7 parts. The plastic sedimentation rate of the self-compacting concrete is 0.012% when the concrete is placed in the warehouse until the concrete is finally set, and the plastic sedimentation rate is obviously smaller than that of the traditional self-compacting concrete. In addition, the early self-generated volume deformation of the self-compacting concrete in the warehouse is in an expansion state, which shows that the combination of the microcapsule water-absorbing resin and the high-doped calcium oxide expanding agent not only can completely compensate the early self-contraction of the concrete, but also can generate self-expansion.
After the concrete is poured for 3 days, the trolley template is advanced, and then the vault is observed, so that the phenomenon of unaided vault is not seen.
Examples
The construction process of the mountain tunnel secondary lining structure concrete of the present embodiment is the same as that of embodiment 1, except that the normal concrete and the self-compacting concrete used are slightly different.
The normal concrete provided for the construction process step four of the embodiment consists of the following components in parts by mass: 42.5 ordinary Portland cement 200 parts, microbeads 100 parts, limestone powder 60 parts, calcium oxide expanding agent 35 parts, river sand 600 parts with fineness modulus of 2.5, 5 mm-10 mm continuous graded broken stone 200 parts, 10 mm-25 mm continuous graded broken stone 650 parts, mixing water 150 parts and water reducer 6 parts. The slump in the warehouse is 160mm, and the plastic sedimentation rate is 0.009% when the concrete is finally set in the warehouse, which is obviously smaller than that of the common concrete.
The self-compacting concrete provided for the construction process of the embodiment comprises the following components in parts by mass: 220 parts of 42.5 ordinary Portland cement, 100 parts of limestone powder, 80 parts of fly ash, 20 parts of white carbon black, 50 parts of calcium oxide expanding agent, 10 parts of microcapsule water-absorbing resin, 800 parts of river sand with the fineness modulus of 2.5, 900 parts of 5 mm-15 mm broken stone, 130 parts of mixing water and 8 parts of water reducer. The plastic sedimentation rate of the self-compacting concrete is 0.012% when the storage expansion degree is 555 x 560mm and the storage is finished until the concrete is finally solidified, which is obviously smaller than that of the traditional self-compacting concrete. In addition, the early self-generated volume deformation of the self-compacting concrete in the warehouse is in an expansion state, which shows that the combination of the microcapsule water-absorbing resin and the high-doped calcium oxide expanding agent not only can completely compensate the early self-contraction of the concrete, but also can generate self-expansion.
After the concrete is poured for 3 days, the trolley template is advanced, and then the vault is observed, so that the phenomenon of unaided vault is not seen.
Claims (5)
1. The application of the movable full-section integral steel mould lining trolley is characterized in that the movable full-section integral steel mould lining trolley is provided with an external arch steel mould plate, a bottom steel mould plate, two lining steel mould plates and trolley shifting rollers; the outer arch steel template is connected with the two lining steel templates through supporting movable pins; the displacement roller moves along the track direction;
the method is characterized in that: the method is applied to pumping pouring of tunnel concrete;
pouring holes and observation windows are formed in the middle position of the top of the outer arch steel template and the middle position of the waist parts of the two sides of the outer arch steel template; the middle of the bottom plate steel template is provided with exhaust holes along the travelling direction of the trolley, and the distance between the exhaust holes is about 3-4 meters; the shifting roller is arranged at the bottom of the two lining steel templates and can stretch out and draw back;
the method is applied to concrete pumping pouring of tunnel concrete and comprises the following specific steps:
step one, opening all sealing covers of pouring holes, observation windows and exhaust holes;
connecting a concrete pump pipe with pouring holes at two sides of the waist of the outer arch steel template of the trolley, putting concrete into bins from two sides of the trolley template, symmetrically pouring until the overflow of the bottom vent hole is obvious, removing excessive overflow slurry, and closing the bottom vent hole sealing cover;
continuously pouring concrete until the liquid level of the concrete rises to the waist observation window position of the trolley template, stopping pouring when the liquid level differences at two sides of the template are basically consistent, taking out a concrete pump pipe, and closing a waist pouring hole and an observation window sealing cover;
connecting a concrete pump pipe with a pouring hole at the top of the trolley template, continuing pouring concrete, and closing a sealing cover of the top observation window until pouring is completed when the liquid level of the concrete is close to the top observation window;
pouring common anti-sedimentation concrete from below the waist to the bottom plate by taking the waist observation window of the trolley as a boundary line, and pouring self-compacting concrete from above the waist to the top;
the common anti-sedimentation concrete consists of the following components in parts by mass: 180-200 parts of 42.5 ordinary Portland cement, 100-120 parts of microbeads, 50-60 parts of limestone powder, 30-35 parts of calcium oxide expanding agent, 600-650 parts of river sand with the fineness modulus of 2.5, 200-250 parts of 5 mm-10 mm continuous graded broken stone, 550-600 parts of 10 mm-25 mm continuous graded broken stone, 150-160 parts of mixing water and 4-6 parts of water reducer;
the microbeads are solid aluminosilicate fine powder with global continuous particle size distribution;
the self-compacting anti-sedimentation concrete consists of the following components in parts by weight: 200-220 parts of 42.5 ordinary Portland cement, 100-120 parts of limestone powder, 80-100 parts of fly ash, 20-25 parts of white carbon black, 50-60 parts of a calcium oxide expanding agent, 10-15 parts of microcapsule water-absorbent resin, 750-800 parts of river sand with the fineness modulus of 2.5, 900-950 parts of 5 mm-15 mm broken stone, 130-140 parts of mixing water and 7-8 parts of a water reducer;
the microcapsule water-absorbing resin is a core-shell structure formed by taking high water-absorbing resin synthesized by acrylic acid with low crosslinking degree and salt thereof as a core and taking microcapsules synthesized by polylactic acid with high crosslinking degree as a shell.
2. The use according to claim 1, wherein the pouring holes on both sides of the waist of the external arch steel form of the movable full-section integral steel form lining trolley are symmetrically arranged, and the observation window is arranged beside the pouring holes.
3. Use according to claim 1, wherein the vent is provided with a closure.
4. The use according to claim 1, wherein the pouring aperture is provided with a cover.
5. Use according to claim 1, wherein the viewing window is provided with a cover.
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