CN205259216U - Adopt steel truss to add concrete structure of back cover under water of muscle - Google Patents
Adopt steel truss to add concrete structure of back cover under water of muscle Download PDFInfo
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- CN205259216U CN205259216U CN201521076581.3U CN201521076581U CN205259216U CN 205259216 U CN205259216 U CN 205259216U CN 201521076581 U CN201521076581 U CN 201521076581U CN 205259216 U CN205259216 U CN 205259216U
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- steel truss
- under water
- support body
- horizontal
- back cover
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Abstract
The utility model discloses an adopt steel truss to add concrete structure of back cover under water of muscle belongs to the deep basal pit back cover field under water of being under construction, include that the back cover concrete uses and interior steel truss as the skeleton under water, the steel truss includes upper support body, in lower floor's support body and the connection, the middle support body of lower floor's support body, on, lower floor's support body becomes network structure by a plurality of horizontal horizontal members and fore -and -aft horizontal member cross, middle support body includes the pole setting, horizontal chord member and vertical chord member, the pole setting is connected in last, between the horizontal member and horizontal member intersect of lower floor's support body, horizontal chord member is connected between horizontal adjacent coexistence pole, vertical chord member is connected between fore -and -aft adjacent coexistence pole. The utility model discloses can play effect of reinforcement, the thickness of attenuate back cover concrete to reach the purpose that reduces construction cost, can reduce this type of construction degree of difficulty of back cover concrete under water again, ensure the construction quality and construction safety of back cover concrete.
Description
Technical field
The utility model belongs in field of bridge construction deep foundation pit construction and the interval ventilating shaft of urban track traffic construction field is executedIn work, for guaranteeing to form dry operating condition in deep basal pit, and a kind of novel structure of bottom concrete under water of design. Be suitable forIn all kinds of deep foundation pit constructions back cover under water.
Background technology
In bridge foundation construction, because cushion cap is embedding dark, excavation of foundation pit is darker, for guaranteeing that cushion cap can form dry operation and executeWork need be built underwater concrete and be carried out back cover in cofferdam. Sometimes because cutting depth is dark, inside and outside cofferdam, there is larger waterPressure head, causes bottom concrete need to bear larger water pressure like this, for guaranteeing stressed safety, causes back cover coagulation under waterThe thickness of soil is thicker, and correspondingly the total height in the degree of depth of transferring in cofferdam, cofferdam, gross weight also all will strengthen, in cofferdamExcavation project amount and transfer difficulty also significantly strengthen. Affected by basement strata, the degree of depth that transfer in cofferdam is limited, Bu NengmanFoot plain concrete when the required thickness of back cover, carries out arrangement of reinforcement to reach attenuate envelope under water so under water in bottom concreteThe thickness object of base concrete, and guarantee that bottom concrete meets force request.
In addition, in the interval ventilating shaft construction of city track traffic engineering, because interval ventilating shaft needs double service channel, the ventilating duct of doingAnd be provided with draining pump house station, thereby interval ventilating shaft is often arranged on line elevation lowest part, causes the ventilating shaft construction and excavation degree of depth dark.If the waters such as rivers need be passed through in this interval, ventilating shaft is generally close to river course embankment setting. Consider that shield structure need be from interval ventilating shaftPass, and construction in later period air channel and service channel need abolish the section of jurisdiction in ventilating shaft, for preventing occurring that water burst gushes sand after section of jurisdiction from abolishingPhenomenon, guarantees construction safety, need in ventilating shaft, below shield structure interval, build bottom concrete. For reducing back cover thickness, reduceConstruction cost, in bottom concrete, arrangement of reinforcement is auxiliary stressed under water.
(1) traditional steel reinforcement cage bottom concrete structure under water:
As shown in Figures 1 to 3, for ease of construction, reduce difficulty of construction, traditional deep basal pit under water bottom concrete is generally establishedCount plain concrete. But in particular cases, consider to reduce earthwork excavated volume in the weight in the cofferdam sinking degree of depth, cofferdam and cofferdam,Reduce cofferdam back cover thickness, reduce construction cost, sometimes also in bottom concrete, carry out arrangement of reinforcement under water. Traditional way isSteel reinforcement cage is installed in concrete under water, is formed steel reinforcement cage bottom concrete under water. It when construction, is also the good steel reinforcement cage of ground colligationAfter, the lifting of steel reinforcement cage monoblock is transferred in place.
Steel reinforcement cage is generally divided into upper and lower two-layer reinforced mesh, forms entirety for ease of steel reinforcement cage, between upper and lower two layers of mesh sheet, arrangesSome cableways and distributing bar. Upper and lower reinforced mesh is by lengthways main steel bar and horizontal main muscle composition, and main muscle size is according to being subject toPower needs to set, and main muscle spacing is generally 100～150mm.
(2) traditional steel reinforcement cage limitation of bottom concrete structure under water:
1) need integral hoisting: steel reinforcement cage needs integral hoisting, cannot piecemeal lifting be assembled into entirety under water. Due to reinforcing barCage is upper and lower double-layer structure, and centre exists cableway and distributing bar, therefore steel reinforcement cage can not carry out as reinforced meshOverlap joint; The vertical cross main-bar quantity of steel reinforcement cage is more, and diver cannot adopt connector docking spreading in water as land; AlsoBe difficult to adopt welding spreading.
2) lift yieldingly, hoisting cost is high: when steel reinforcement cage integral hoisting, because steel reinforcement cage area is large, Heavy Weight, therefore needWant large-scale lifting appliance to lift, hoisting cost is large, and easily causes steel reinforcement cage distortion.
3) top braces affects steel reinforcement cage integral hoisting: multiple tracks steel supports or reinforcing bar is mixed because top is provided with for many foundation ditches or cofferdamSolidifying soil supports, and causes steel reinforcement cage cannot integral hoisting in place.
4) conduit difficulty in place is large: build because bottom concrete need to adopt many conduits, and every conduit is at first tankNeed be from basal surface 300mm left and right when time builds, conduit must pass steel reinforcement cage top layer reinforced mesh like this, due to the main muscle of net sheetSpacing, much smaller than conduit diameter, causes conduit to transfer and puts in place. Certainly can consider to reserve in advance in the time of fabrication of reinforcing cageConduit is hole arranged, but because foundation ditch is darker, what have reaches 40 meters, and conduit still difficulty is accurately in place.
5) to pull out difficulty large for conduit: after casting concrete, affected by concrete lateral pressure, conduit is often amesiality, tightBy the main muscle of steel reinforcement cage, cause conduit to be stuck, be difficult to promote.
6) bottom concrete packing is poor, of poor quality: due to more than conduit can only be arranged on steel reinforcement cage underlying network sheet, first tank is mixedWhen solidifying soil is built, due to steel reinforcement cage keep flat and the main muscle spacing of net sheet less, when first tank concreting, bottom concrete is directImpact on steel reinforcement cage net sheet, and concrete cannot adopt vibrating spear to vibrate, easily cause concreting leakiness even to produceRaw segregation phenomenon.
7) easily produce rising of steel cage, affect the construction of the stressed and subsequent handling of bottom concrete: due to the main muscle of steel reinforcement cage net sheetSpacing is less, easily produces rising of steel cage, so not only affects bottom concrete stressed. Ventilating shaft construction in the middle of shield structure intervalIn bottom concrete work progress, once the rising of steel cage in bottom concrete, to shield structure interval range, floats like thisSteel reinforcement cage also can affect shield machine and pass through smoothly middle ventilating shaft, and intractability is very large.
Utility model content
The purpose of this utility model is: for traditional steel reinforcement cage limitation of bottom concrete under water, improve practical newType, adopts novel steel truss reinforcement bottom concrete structure under water, can play reinforcement effects, attenuate bottom concreteThickness, thus the object that reduces construction cost arrived, can reduce again this class difficulty of construction of bottom concrete under water, guarantee envelopeThe construction quality of base concrete and construction safety.
The utility model object realizes by following technical proposals:
Adopt the structure of bottom concrete under water of steel truss reinforcement, comprise bottom concrete under water taking and in as the steel of skeletonTruss, steel truss comprises upper strata support body, lower floor's support body and connects the middle support body of upper and lower layer support body, upper and lower layer support bodyReticulate structure by some horizontal transverse bar member and longitudinal horizontal bars right-angled intersection, middle support body comprises vertical rod, horizontal strokeTo chord member and longitudinal chord member, vertical rod is connected between the transverse bar member and horizontal bars crosspoint of upper and lower layer support body, laterally stringBar is connected between horizontal adjacent two vertical rods, and longitudinally chord member is connected between longitudinal adjacent two vertical rods.
As selection, between each horizontal chord member, head and the tail connect and are " M " font.
As selection, between each longitudinal chord member, head and the tail connect and are " M " font.
As selection, steel truss is assembled into entirety by some burst steel truss cold lappings. Or steel truss is an overall truss.
As selection, the each rod member of truss adopts I-steel, H shaped steel or channel-section steel processing.
As selection, steel truss is latticed, and mesh spacing is 1 ± 0.5m. In this scheme, steel truss is latticed, gridSpacing is larger, is beneficial to the concrete self-compaction that flows, and is beneficial to conduit peace and tears open.
As selection, bottom concrete is self-compaction underwater concrete under water. In this scheme, concrete does not need to adopt vibrating spearVibrate.
The main scheme of aforementioned the utility model and each further selection scheme thereof can independent assortment to form multiple schemes, be this realityAdopt and claimed scheme with novel: as the utility model, each selection can be selected any combination, ability with otherField technique personnel can understand there is multiple combination according to prior art and common practise after understanding the utility model scheme, are thisThe claimed technical scheme of utility model, does not do exhaustive at this.
The beneficial effects of the utility model: adopt novel steel truss reinforcement under water bottom concrete carry out back cover, with traditional steelMuscle cage bottom concrete is compared has following significant advantage:
1) can, according to field condition, can select partition machining, the form of construction work that burst is installed, also can select entirety to addThe mode of work, integral hoisting.
2) area of plane and the weight of single lifting are relatively little, when steel truss lifting distortion relatively little, lifting appliance abilityAlso can be relatively little, construction cost is relatively low.
3) steel truss is installed and is subject to the support at foundation ditch top to affect relatively little.
4), because steel truss mesh spacing is large, therefore the installation of back cover conduit is easily in place, more convenient when conduit is pulled out, conduit is blockedThe probability of living is relatively little.
5) because steel truss mesh spacing is large, bottom concrete easily wraps steel truss, and bottom concrete is built denser,Quality is easily guaranteed.
6), because steel truss mesh spacing is large, the impulsive force in bottom concrete casting process can not make steel truss floating, therebyCan not affect the construction of subsequent handling. Especially the coagulation of back cover under water of ventilating shaft construction employing steel truss reinforcement in the middle of shield structure intervalSoil construction, can not produce steel truss cage and float up in shield structure interval range, can not affect like this shield machine and pass through smoothly middle windWell. Greatly reduce like this risk of construction.
Brief description of the drawings
Fig. 1 is traditional steel reinforcement cage bottom concrete elevational schematic view under water;
Fig. 2 is the A-A profile of Fig. 1;
Fig. 3 is the A drawing of Fig. 2;
Fig. 4 is the steel truss bottom concrete elevational schematic view under water of the utility model embodiment;
Fig. 5 is the B-B generalized section of Fig. 4;
Wherein 1 be ground-connecting-wall or cofferdam, 2 for steel reinforcement cage, 3 for bottom concrete under water, 4 for absolute altitude, 5 at the bottom of back cover be baseUnderground water bit line, 6 be above-ground route, 7 for steel reinforcement cage net sheet, 8 for horizontal main muscle, 9 for horizontal bars, 10 for transverse bar member,11 is that vertical rod, 12 is chord member.
Detailed description of the invention
Following non-limiting examples is used for illustrating the utility model.
Shown in figure 4,5, the structure of bottom concrete under water that adopts steel truss reinforcement is by steel truss and back cover coagulation under waterSoil 3 compositions. Utilize steel truss to replace steel reinforcement cage be subject to curved and bear tension, to play the object of attenuate bottom concrete.Wherein steel truss is made up of the chord member 12 of some horizontal bars 9, transverse bar member 10, vertical rod 11 and vertical, horizontal, trussEach rod member, according to stressed needs, can adopt I-steel, H shaped steel or channel-section steel processing. Concrete structure is: steel truss is by upper bed rackBody, lower floor's support body and middle the support body that connects upper and lower layer support body form, and upper and lower layer support body is by some horizontal horizontalRod member 10 and longitudinal horizontal bars 9 right-angled intersections reticulate structure, and middle support body is by vertical rod 11, horizontal chord member 12 andLongitudinal chord member 12 forms, and vertical rod 11 is connected between the transverse bar member 10 and horizontal bars 9 crosspoints of upper and lower layer support body,Horizontal chord member 12 is laterally connected between adjacent two vertical rods 11, and between each horizontal chord member 12, head and the tail connection is " M "Font, longitudinal chord member 12 is longitudinally connected between adjacent two vertical rods 11, and between each longitudinal chord member 12, head and the tail connection is" M " font. Because steel truss mesh spacing is large, can adopt under water the mode piecemeal of cold lapping to be assembled into entirety, therefore steelTruss can, according to lifting needs, can be made by burst, also can entirety process.
Steel truss reinforcement underwater concrete structure construction step is as follows:
1) after cofferdam installs or after ground-connecting-wall constructs, in foundation ditch, underwater excavation, to bottom concrete bottom surface absolute altitude, enters under waterRow substrate leveling.
2) design drawing is pressed at scene on land, processes steel truss according to design drawing burst or entirety, when partition machining, takes an examinationConsider the lap of splice.
3) lifting of steel truss monoblock or piecemeal is transferred in placely, needs diver to install when cold lapping under water, guarantees the lap of spliceMeet the demands.
4) set up back cover platform, lay centralized hopper, chute; Transfer some back cover conduits in steel truss grid from substrateFace 300mm left and right.
5) match ratio of the bottom concrete under water ready-mixed concrete of joining according to examination is transported to scene.
6) carry out the construction of head envelope by root can opening, then normally build.
7) back cover complete after dismounting back cover conduit, centralized hopper, chute and back cover platform, wait bottom concrete intensity to reachAfter design strength, draw water.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all new in this practicalityAny amendment of doing within the spirit of type and principle, be equal to and replace and improvement etc., all should be included in protection of the present utility modelWithin scope.
Claims (8)
1. the structure of bottom concrete under water that adopts steel truss reinforcement, is characterized in that: comprise under water bottom concrete with and inFor the steel truss of skeleton, steel truss comprises upper strata support body, lower floor's support body and connects middle the support body of upper and lower layer support body, go up,Lower floor's support body reticulates structure by some horizontal transverse bar member and longitudinal horizontal bars right-angled intersection, and middle support body comprises verticalBar, laterally chord member and longitudinal chord member, vertical rod is connected between the transverse bar member and horizontal bars crosspoint of upper and lower layer support body, horizontal strokeBe connected between horizontal adjacent two vertical rods to chord member, longitudinally chord member is connected between longitudinal adjacent two vertical rods.
2. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: each horizontal chord member itBetween head and the tail connect and be " M " font.
3. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: each longitudinal chord member itBetween head and the tail connect and be " M " font.
4. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: steel truss is by someBurst steel truss cold lapping is assembled into entirety.
5. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: steel truss is one wholeBody truss.
6. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: the each rod member of truss is adoptedWith I-steel, H shaped steel or channel-section steel processing.
7. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: steel truss is gridShape, mesh spacing is 1 ± 0.5m.
8. the structure of bottom concrete under water of employing steel truss reinforcement as claimed in claim 1, is characterized in that: back cover coagulation under waterSoil is self-compaction underwater concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521076581.3U CN205259216U (en) | 2015-12-17 | 2015-12-17 | Adopt steel truss to add concrete structure of back cover under water of muscle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521076581.3U CN205259216U (en) | 2015-12-17 | 2015-12-17 | Adopt steel truss to add concrete structure of back cover under water of muscle |
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| Publication Number | Publication Date |
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| CN205259216U true CN205259216U (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521076581.3U Expired - Fee Related CN205259216U (en) | 2015-12-17 | 2015-12-17 | Adopt steel truss to add concrete structure of back cover under water of muscle |
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| CN (1) | CN205259216U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374120A (en) * | 2019-07-22 | 2019-10-25 | 中铁大桥局集团有限公司 | A kind of precast-boxed cofferdam monoblock type is put more energy into back cover construction method |
-
2015
- 2015-12-17 CN CN201521076581.3U patent/CN205259216U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374120A (en) * | 2019-07-22 | 2019-10-25 | 中铁大桥局集团有限公司 | A kind of precast-boxed cofferdam monoblock type is put more energy into back cover construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160525 Termination date: 20191217 |