CN100535254C - Once forming construction technique for concrete panel rock fill dam bedding material and slope fixing mortar - Google Patents

Once forming construction technique for concrete panel rock fill dam bedding material and slope fixing mortar Download PDF

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CN100535254C
CN100535254C CNB2005101190964A CN200510119096A CN100535254C CN 100535254 C CN100535254 C CN 100535254C CN B2005101190964 A CNB2005101190964 A CN B2005101190964A CN 200510119096 A CN200510119096 A CN 200510119096A CN 100535254 C CN100535254 C CN 100535254C
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template
bedding
slope
dam
construction
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CNB2005101190964A
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CN101058974A (en
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常焕生
苏加林
李岱
张云山
王占臣
杜占江
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中国水利水电建设集团公司
中国水利水电第一工程局
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Abstract

The present invention involves a concrete face slab rock-fill dams bedding materials and solid slope sand pulp one-shot forming construction new technology: first, uprighting special template on upstream slope; lying bedding materials, the bedding materials under the template is laid manually; rolling the bedding materials; then extracting the wedge plate connected with the template, casting concrete sand pulp in the uniform slits formed between template and bedding materials, then vibrating and rolling twice; last unfolding the lowest layer template and uprighting it on the tallest layer; circulating just like this, until the dam top is constructed. The sand pulp solid slope is formed with the forming of bedding materials construction simultaneously, the dam bedding materials upstream slope surface need not be constructed with rolling sand pulp, the degree of density and thickness of total slope surface is uniform, the dam has dashing and flood passing condition at any time, the flood passing security of dam is improved and the dam straight project time is shortened 2-3 months; the construction costs are reduced and the construction safety is improved.

Description

Concrete panel rock fill dam bedding material and slope fixing mortar once-forming construction method

Technical field:

The present invention relates to a kind of concrete panel rock fill dam bedding material and slope fixing mortar once forming construction technique, be applied to the Hydraulic and Hydro-Power Engineering field.

Background technology:

Now, Concrete Face Rockfill Dam is widely used in Hydraulic and Hydro-Power Engineering.Compaction type Concrete Face Rockfill Dam so that modern technologies are built has had about 40 years history abroad, and the history in 20 years has also been arranged in China.Concrete Face Rockfill Dam as shown in Figure 1, the domatic construction in bedding material upstream are the keys of the quality that concerns panel, dam construction progress and a large amount of construction costs.In decades, the bedding material up stream slope surface construction of the Concrete Face Rockfill Dam of home and abroad adopts the slope to roll solid sloping method always.By this conventional construction method and technology, when bedding material fills upstream about face extra-fill 30cm, before the panel construction, repair that slope, slope are rolled, the mortar that manually paves on the slope, roll on the slope again.At present, the domestic general methods that adopt manual amendment more, promptly rise to certain elevation at dam embankment, after slope length reaches several meters or ten several meters, manually standing on the slope takes off bedding material flat with hoe, artificial hanging wire is also used 1: 1.4 piecemeal the slope chi of (or dam slope degree in accordance with regulations) is checked, also needs control with transit in taking off flat process.Whole again slope once after quiet stone roller 2~3 passes on the slope (just grinding)." generally need twice manual amendment, the slope of cutting of some face dam then is once to finish.Side slope line after the finishing should be higher than design side slope line 3.5~6.0cm in normal direction, rolls settling amount with reservation.”

" because the carefully and neatly done slope of people can only down take off material, the bedding material waste is more serious, and the bedding material of taking off down also need scoop away, and for higher side slope, the workman stands in and operates safety inadequately on the slope, and speed is also very slow.The method on the whole slope of therefore more external engineering multipurpose machine tools.Utilize laser directrix and telescopic long-armed backhoe to carry out slope trimming.”

" promptly carrying out the slope after domatic finishing rolls.”

" domatic through the bed course that roll on the slope, although have certain compactness, the poor performance of its anti-current erosion and outside destroy need be carried out the construction period protective treatment to bed course is domatic.”

" the comprehensive construction experiences of face dam both at home and abroad, the method for bed course slope protection is commonly used mulseal, the pneumatically placed concrete of sprinkling arranged and rolls mortar etc. several.”

" rolling the cement mortar protection, is the dry cement mortar that paves on bed course is domatic, uses the method for vibrating roller compacting then.The most engineerings of China adopt the method ".

Pertinent regulations among " Concrete Face Rockfill Dam job specfication " DL/T5128-2001 are:

" the super wide 20cm~30cm that is generally of sideline, bedding material making upstream level.”

" bedding material should whenever fill rising 10m~15m, carries out the domatic slope of cutting of bed course and repairs and roll.As adopt backhoe to cut the appropriate to the occasion every raising 3.0m~4.5m in slope and carry out once.Cut that slope finishing back is domatic should to be higher than design lines 5cm~8cm in normal direction.Have ready conditions and appropriate to the occasionly cut the gradient with laser controlling.

" available vibrating roller or oscillating flat plate are rolled in the slope.Rolling mode and roll parameter should be definite through testing.

" rainy season construction should be shortened domatic whole slope, upstream, protection cycle, and carries out the bank slope draining, guarantees that bedding material exempts from runoff and washes away.As by current scour, should adopt bedding material to carry out the thin layer backfill compacting, reach designing requirement.

" after the domatic compacting of bed course is qualified, should carry out domatic protection as early as possible, protection form commonly used also can adopt spray mulseal, pneumatically placed concrete etc., and should meet the following requirements for rolling cement mortar:

1 rolls cement mortar

Cement mortar mix ratio, layer thickness should adhere to specification.

Cement mortar is paved by artificial or machinery, and every vertically hung scroll width should not be less than 4m, should roll before the mortar initial set to finish, and the maintenance of sprinkling water after the final set, rolling method and pass are determined by test.

Mortar surface after rolling should not be higher than design lines 5cm, or is lower than design lines 8cm.”

Sum up construction experience for many years, the shortcoming that solid sloping method is rolled on the slope is clearly: it is big to repair sloping engineering quantity, and expense expects, takes a lot of work, time-consuming.Slope grinding compacting degree is difficult to guarantee that compactness distributes very inhomogeneous on the slope.Although " the mortar surface after rolling should not be higher than design lines 5cm, or is lower than design lines 8cm " standard of code requirement is quite low, also be difficult in the practice of construction reach, cause a large amount of extra-fills of panel concrete.Domatic under long-time unguarded situation, be subjected to rain drop erosion easily and partial collapse.Domaticly do not doing under the situation of protection and can not cross flood by dash.

In recent years, state, inside and outside some engineering had adopted concrete squash type abutment wall construction technology to carry out face dam bedding material up stream slope surface construction, improved to some extent than traditional handicraft.But from effect, do not have accurate control measure owing to push when wall is constructed, its each layer joint very easily forms faulting of slab ends, and the slope leveling degree is relatively poor, and the later stage, domatic finishing process amount was big.The extruding wall is equivalent to gravity retaining wall for bedding material, and (cross sectional area reaches 0.18m so its size is big 2), the concrete work amount is bigger, and cost is higher.After the extruding wall moulding must etc. just can fill bedding material in strong 2~3 hours, construction speed is restricted.Extruding wall bottom surface and top thickness differ greatly, and for panel provides a very uneven basis, counter plate is stressed may to have a negative impact.

Summary of the invention:

The object of the present invention is to provide a kind of concrete panel rock fill dam bedding material and slope fixing mortar once forming construction technique, the bedding material of each layer is filled with mortar Gu Po to be finished simultaneously, improve the domatic construction quality in face dam bedding material upstream, accelerate the dam construction progress, reduce construction costs.

Technical scheme of the present invention is achieved in that concrete panel rock fill dam bedding material and slope fixing mortar once forming construction technique, and its concrete construction sequence is:

1. domatic at first at its upstream propping up by the measurement setting-out found special template; Every layer of formwork support arrangement height and bedding material fill layer thickness and adapt, and are generally 40cm; With filling layer rising upright two-layer or three layers of template altogether, the template number of plies is decided on the mortar strength growth pattern; Between each template with U type card connection; Perpendicular the enclosing of upper and lower layer template is provided with reliable connection between the order, make lower template provide constraint to upper former; At template installed inside wedge, the lower horizontal surface of wedge and slope form 35.54 ° of angles; φ 12 reinforcing bars are adopted in the template lacing wire, weld mutually with φ 20 screw-thread steels in being anchored at the bottom bedding material.

2. the bedding material that paves, template bottom bedding material is by manually paving.

3. bedding material is carried out just grinding; Vibrating roller is adopted in the back watering about bedding material stone 40cm, first static pressure 1 time, and vibroroller cmpacting is 5 times then.

4. extract wedge, form between template and bedding material in the uniform slit behind the casting cement mortar, vibroroller cmpacting is 2 times again, and the stone roller rolling edge of its vibrating roller should not be greater than 7cm apart from the upper horizontal plane edge of slope bedding material.

5. the orlop template is pulled down, Zhi Li is to the superiors; Have bindiny mechanism between the two-layer up and down template, and can arbitrarily adjust template position, it is adhered to specification, and make over-form construction reach higher work efficiency, to guarantee the construction speed of dam; To guarantee on slope, to carry out the safety of over-form construction simultaneously.

So circulation is until the dam crest of constructing.

Good effect of the present invention is that the domatic bedding material in dam upstream does not need to carry out the slope again and rolls, and compactness can reach designing requirement, and whole domatic compactness is even.Dam bedding material upstream is domatic not to be needed to apply again and rolls mortar, mortar Gu Po fills promptly with bedding material and forms simultaneously, its physical and mechanical property can reach designing requirement, and thickness is even, surface finish rolls solid sloping method than the slope and extruding wall method improves greatly, does not need to carry out trimming of slope again.Because dam up stream slope facing sand slurry Gu Po forms along with dam fills simultaneously, crosses the flood condition so dam possesses dash at any time, make dam cross the flood safety and improve.Do not need to carry out bedding material extra-fill, domatic finishing and slope and roll, shorten 2~3 months dam straight line durations.Reduce construction cost: every square meter panel can be saved bedding material 0.3m 3About; Every square meter panel can reduce concrete extra-fill 0.13m 3About.Working security improves.Reduce construction costs 20%~30% than the extruding wall technology.

Description of drawings:

Fig. 1 is a Concrete Face Rockfill Dam typical case drawing in side sectional elevation;

Fig. 2 is the domatic mode structure figure that turns in bedding material of the present invention upstream;

Fig. 3 is the domatic formwork support arrangement schematic diagram of bedding material of the present invention;

Fig. 4 is that bedding material of the present invention grinds schematic diagram eventually;

Fig. 5 turns over for template of the present invention and rises one deck schematic diagram.

The specific embodiment:

The present invention will be further described below in conjunction with the test example:

Test example 1:

In April, 2005~October, done test of many times in building site, Shuan Gou power station and verified, to verify practical feasibility of the present invention, obtained complete ideal results.In November, 2005, domestic water power industry specialists six people have been invited, to two ditch scenes result of the test is proved and seeked advice from, think that the present invention " analyzes; this technology all satisfies the effectiveness of extruding wall; all being better than pushing wall aspect structure, engineering difficulty, the cost, can be used for the construction of Shuan Gou power station face dam on the whole.”

It is domestic that the Shuan Gou power station is positioned at mountain area, the southeast, Jilin Province Fusong County, on the river, Songjiang, upstream, second Song Hua River.Two ditch dam sites are apart from the about 30.0km in hill power station, and dam site is selected in the valley of little couple of ditch village 5.0km.The Shuan Gou power station is hybrid exploitation power station, the bend that utilizes the river, Songjiang with 800.0m about long diversion tunnel obtain river channel natural drop 13.0m.Hinge is made up of Concrete Face Rockfill Dam, bank slope flood spillway and diversion and power system.

The maximum height of dam 110m of Shuan Gou power station rock, total reservoir storage 3.95 * 108m 3, regulate storage capacity 1.45 * 108m 3, installed capacity of power station 280MW.Two ditch Concrete Face Rockfill Dam ranks are 1 grade of building.The long 294m of dam crest, upstream concrete slab are divided into 29,12 of positions, intermediate portion, every wide 14m; 8 on the left side, every wide 7m; 9 on the right, every wide 7m.Crest elevation is 590m.Width at dam crest 10m.Upstream dam slope 1: 1.4, the average dam slope in downstream 1: 1.52.

Before test, need carry out smooth, unwrapping wire, installation slope template and wedge to the test site, carry out the bedding material stone then and roll, extract wedge perfusion slope fixing mortar out, the dither effect vibration slope fixing mortar when utilizing the vibroroller cmpacting bedding material makes it reach closely knit.Concrete grammar is as described below:

(1) levelling of the land: before formal stone, at first use the defective material of bulldozer desurfacing, and the leveling place.Use 18t vibrating roller grinding compacting then, fill fresh rock ballast, the place is not more than 5cm by artificial levelling to relative relief, and number of rolling is no less than 20 times, is compacted to settling amount and tends towards stability, and then carry out the domatic mould that turns in bedding material upstream and test.The bedding material maximum particle diameter is not more than 100mm, between 30%~50%, is lower than 8% less than the granule content of 0.1mm less than the granule content of 5mm, nonuniformity coefficient Cu 〉=25, and coefficient of curvature Cc is between 1~3.Bedding material is obtained after hand breaking by the fresh andesite of quality.Need sprinkle water when laying bedding material, its amount is as the criterion with ponding not.Rolling apparatus adopts the self-propelled vibrating roller, and work quality should be not less than 15t.The layer thickness and the vibrating roller speed of travel, number of rolling need to determine by the on-site rolling test.Slope fixing mortar employing strength grade is the Portland cement preparation more than 32.5, and consistency of mortar is suitable, is the best with domatic the trickling, and its strength grade is generally 5MPa, and modulus of elasticity is less than 1 * 10 4MPa.

(2) measure unwrapping wire: with the test site subregion, indicate with the lime line, carry out the installation of slope template and wedge as shown in Figure 2, utilize established lower floor bedding material to fill the supporting capacity fixed form of layer and mortar Gu Po, template is fixed by lacing wire, and lacing wire is welded on steel pipe (or reinforcing bar) earth anchor of squeezing into lower floor's bedding material; Pre-buried wedge is extracted between back and the bedding material and is formed the slit under template as shown in Figure 3, and perfusion mortar therein.Template was to the squeezing action of mortar and bedding material and the effect of vibrating of vibrating roller when utilization rolled, and making below the template is that domatic bedding material in upstream and mortar reach closely knit, bedding material is filled with mortar Gu Po finish simultaneously.Because the precision of formwork support arrangement is higher, fixed, for slope fixing mortar and bedding material provide distortion small lateral restraint, so the displacement of template is very little, measured value is no more than 10mm, thereby the surface finish deviation that guarantees mortar Gu Po is no more than 2cm.Template is a steel form, has bindiny mechanism between the two-layer up and down template, and can arbitrarily adjust template position.Template is filled and is turned over liter with bedding material.

(3) stone fills

Be the width and the quality of guarantee test material, bedding material adopts and retreats the method stone as requested, pushes away flat with bulldozer layer thickness on request then; Concrete grammar is as follows:

1. the bed course stockpile is discharged on the platform of appointment;

2. the spacing of bed course stockpile is determined according to the thickness of pre-coated layer, overstockedly then increases the bulldozer workload and is difficult to push away flat, and crossing rarely needs secondary to mend again to fill out; In distance surface of filling forward position 4~6m distance portable mark post is set, the bulldozer operator avoids super thick or thin excessively according to mark post control filler bed thickness.

When 3. the dump truck discharging is moveed backward, there is the special messenger to command, sprinkles lime as filling the material control line, in the stone process,, prevent that coarse fodder is concentrated,, guarantee to fill quality to guarantee to expect the rational position of thing near wanting hand-stuff, leveling in the template place by design lines.

When 4. bulldozer was put down material, blade should begin pusher from the lowest part of stockpile one side, moves to opposite side gradually.If begin to push away, then push away flat difficulty from the stockpile highest point.

(4) arrange the settlement measurement point

Lay when bedding material and to begin watering after smooth, its amount is as the criterion for ponding not, begins then in test section according to the grid cloth point measurement, and makes mark with lime, and 9 settlement measurement points of layout during test write down its coordinate and measure the initial elevation of each measuring point.

(5) field compaction test

Adopt YZ18 vibrating roller (work quality is 18t) road speed to be controlled to be 1~2km/h as shown in Figure 4, elder generation's static pressure 1 time, propose wedge behind the vibroroller cmpacting 5 times then, at this moment the bedding material on the slope is that fine sand is received faces substantially, and the slope leveling degree can satisfy slope fixing mortar cast requirement.Behind the casting cement mortar, the vibroroller cmpacting bedding material is 2 times again, just can make cement mortar obtain vibratory compaction, is equipped with to have used portable small vibration plate in the process of rolling, near the template place or the portable small vibration plate of the counter-slope place employing level pressure of shaking is arranged.Stripping just can prevent heavy rain or wave cut after 1 day, and provides the firm scope of operation for panel concrete construction.Under the effect of vibrating roller, the dry density of slope bedding material and slope fixing mortar intensity can meet design requirement.The slope bedding material under the effect of vibrating roller, its vibration stress downwards and side direction transmission and diffusion, the obstruction that is subjected to template obtains extruding, the compactness increase.Dry density can reach design objective (〉=2.23g/cm 3) requirement, therefore, the bedding material that this job practices forms can be panel even, as to stablize and have a low compressibility good basis is provided.

As shown in Figure 5 the orlop template is pulled down, Zhi Li is to the superiors; Can adjust easily during branching standing template, make it meet design attitude, make over-form construction reach higher work efficiency, to guarantee the construction speed of dam; To guarantee on slope, to carry out the safety of over-form construction simultaneously.

So circulation is until the dam crest of constructing.

Claims (1)

1, concrete panel rock fill dam bedding material and slope fixing mortar once-forming construction method, it is characterized in that: concrete construction sequence is:
1. domatic at first at its upstream propping up by the measurement setting-out found special template (1); Every layer of template (1) upright height fills layer thickness with bedding material and adapts, and is 40cm; With filling layer rising upright two-layer or three layers of template (1) altogether, the template number of plies is decided on the mortar strength growth pattern; Between each template with U type card connection; Upper and lower layer template perpendicular encloses to make reliable connection is set between (2), makes lower template provide constraint to upper former; At template installed inside wedge (3), the lower horizontal surface of wedge (3) and slope form 35.54 ° of angles; φ 12 reinforcing bars are adopted in template lacing wire (4), weld mutually with φ 20 screw-thread steels in being anchored at the bottom bedding material;
2. the bedding material that paves, template bottom bedding material is by manually paving;
3. bedding material is carried out just grinding; Vibrating roller is adopted in the back watering about bedding material stone 40cm, first static pressure 1 time, and vibroroller cmpacting is 5 times then;
4. extract wedge, form between template and bedding material in the uniform slit behind the casting cement mortar, vibroroller cmpacting is 2 times again, and the stone roller rolling edge of its vibrating roller is not more than 7cm apart from the upper horizontal plane edge of slope bedding material;
5. the orlop template is pulled down, Zhi Li is to the superiors; So circulation is until the dam crest of constructing.
CNB2005101190964A 2005-12-21 2005-12-21 Once forming construction technique for concrete panel rock fill dam bedding material and slope fixing mortar CN100535254C (en)

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Application Number Priority Date Filing Date Title
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