CN103898876A - Reinforced concrete U-shaped aqueduct casting template without counter bolts - Google Patents

Abstract

Disclosed is a reinforced concrete U-shaped aqueduct casting template without counter bolts. The template is composed of bottom molds, outer molds, inner molds and main beams. The bottom molds are located right in the middle of the bottom of a whole casting template system and is used for connecting the outer molds symmetrically arranged on two sides of the casting template system, the inner side face of each outer mold is an arc fitting to a U-shaped aqueduct while the outer side face of the same is vertically arranged, a plurality of horizontal, longitudinal and oblique supports are symmetrically arranged between the inner side faces and the outer side faces of the outer molds, U-shaped aqueduct casting cavities are formed among the inner and outer molds, and the inner molds are fixed with the main beams through four vertical profile steel; the main beams cross tops of the outer molds on two sides to be fixedly connected with main diamond profile steel of the outer molds. The reinforced concrete U-shaped aqueduct casting template is cast at one step, horizontal construction seams are omitted, and counter bolt hole corrosion on an aqueduct wall is avoided due to the fact that the counter bolts are not used; the aqueduct is objectively free of water seepage in structure, so that damages due to corrosion never occur, and the outer wall of the an aqueduct body of the aqueduct is clean and attractive.

Description

The reinforced concrete U-shaped aqueduct formwork for placing of a kind of nothing to pin bolt

Technical field

The present invention relates to the U-shaped aqueduct construction of hydraulic engineering field, particularly the reinforced concrete U-shaped aqueduct formwork for placing of a kind of nothing to pin bolt.

Background technology

Its sectional line style of reinforced concrete U-shaped aqueduct is combined by circular arc line and straight line, structure line style complexity, and cell wall is thiner.Existing construction method is to adopt wooden form, whole aqueduct is built and is formed by stages.General technology is: first formwork erection is built the structure of bottom 1/3 section, then formwork erection builds middle part 1/3 section, and last formwork erection is built 1/3 section at top.This technique makes whole joint aqueduct have in the horizontal direction four substage construction seams, and the not same period of the concrete joint surface of these four seams, often because constructional deficiency seeps water.In addition, two not the same period concrete joint surface, because of the difference age of concrete, shrinkage strain is asynchronous, makes again concrete produce vertically to shrinkage crack along horizontal joint vertical direction, this kind of seam is often penetrability crack, seep water more serious, and process more difficult.Existing wood-mode technology need to adopt pin bolt, and external mold in aqueduct is fixed, and this has just produced many bolts hole on aqueduct wall, and bolt hole is also the place of the normal infiltration of a cell wall.

Aqueduct cell wall is because of horizontal joint, Vertical Cracks, bolt hole isotonic water, and the discontinuous full water operation of aqueduct in addition, often makes rises cell wall concrete reinforcing steel in alternation of wetting and drying state, and reinforcing bar easily produces corrosion.When corrosion of steel bar acquires a certain degree, reinforcing bar own vol expands, and under expansive force effect, the outer concrete of cell wall ftractures, until avalanche makes aqueduct cell wall destructurized, affects aqueduct and normally uses.Therefore often make many U-shaped reinforced concrete flumes not reach design life, just need reinforcement or remove the major reason of reconstruction.

Summary of the invention

The problem existing for solving above-mentioned prior art, one of object of the present invention is to propose the reinforced concrete U-shaped aqueduct formwork for placing of a kind of nothing to pin bolt, overall time is built, there is not horizontal construction joint, again because not using pin bolt, on cell wall, without to pin bolt hole corrosion problem, well solve the defect of existing technique.The present invention, owing to there is no horizontal joint and to pin bolt hole, objectively saying that this body structure of aqueduct is impermeable, just can not produce the destruction occurring because of corrosion, and meanwhile, aqueduct body outer wall is also clean, attractive in appearance.

For achieving the above object, technical scheme of the present invention is:

The reinforced concrete U-shaped aqueduct formwork for placing of nothing to pin bolt, concrete steps are:

Step 1, according to the section pattern of aqueduct, according to the size of structure to be onstructed, determine the quantity of required template, using shaped steel and steel plate is one section of design and internal field processing and fabricating that carries out bed die, external mold, internal mold and support system by 2.0～2.5m length;

Step 2, on prefabricated terrace or on falsework by Loft Line, lay bed die, and bolt for adjacent bed die is linked and is reinforced;

Step 3, by assembled section by section to external mold and bed die, adjacent outer intermode adopts bolt to fix;

After step 4, external mold are installed and proofreaied and correct, carry out making and the installation, fixing of aqueduct reinforcing bar;

Step 5, aqueduct reinforcing bar peace utilize crane that internal mold is installed after having made, and carry out section by section the assembled of internal mold, and internal mold top steel main beam and the stupefied shaped steel of external mold master are linked and are integrated by bolt;

After step 6, template installation, before concreting, reinforced concrete prefabricated support beam is placed in to the reserved indent of groove top template;

Step 7, build and front each template installation system is carried out to detailed inspection, remove the wood chip in template, mortar, greasy dirt, earth, guarantee each beam, the installation of post node closely, in continuous placing, guarantee that form lateral pressure is stable, for preventing that crack or surface blemishes from appearring in template inner concrete, template is carried out to maintenance, be specially bedding heat and moisture preserving material, guarantee that temperature is not less than 5 ℃, if indoor/outdoor temperature-difference is greater than 25 ℃, to the template processing of lowering the temperature, when form removable, keep corner complete as far as possible, concrete surface does not damage

Step 8, installation are afterwards used for the end socket template at shutoff groove body two ends, and after reinforce stabilization, carry out the concreting of groove body; Build charging aperture and select successively the pouring hole on internal mold from low to high, until the charging aperture at top, while building by 300～400mm one deck, placement layer by layer layering jolt ramming, often build row's pouring hole stopper by its shutoff, the complete one section of groove of continuous placing is treated concrete coagulation after one's death, carries out afterwards form removal, and form removal process is first removed girder, remove afterwards internal mold, remove again the external mold on both sides, finally remove bed die, after form removal, obtain a complete reinforced concrete U-shaped aqueduct.

The formwork for placing of the reinforced concrete U-shaped aqueduct of described nothing to pin bolt is by bed die, external mold, internal mold, girder composition, the large punching block of described stencil-chosen, steel framework blocking tool, wood plywood, one in bamboo plywood, described bed die is positioned at the external mold that center, whole formwork for placing system bottom arranges for connecting bilateral symmetry, described external mold medial surface is the arc of the U-shaped aqueduct of laminating, the vertical setting of lateral surface for ease of supporting, between interior lateral surface, be symmetrical arranged multiple horizontal, longitudinal and oblique support, inside and outside intermode forms U-shaped aqueduct and builds cavity, in, external mold and concrete joint surface are smooth, can not there be other pollutions, described internal mold is fixed by four vertical shaped steel and girder, described girder is across die tip and the stupefied shaped steel of external mold master outside both sides and is connected, described template also comprises the reinforced concrete prefabricated support beam that is fixed on internal mold top recess, described bed die and external mold adopt Φ 12 bolts to fix, between internal mold and girder, adopt Φ 16 bolts to fix by four vertical shaped steel, girder is connected by Φ 16 bolts and the stupefied shaped steel of external mold master, between adjacent formwork for placing, fix with the bolt of Φ 12 at interval of 20～25cm along piece, and with sticking double faced adhesive tape, on described internal mold, be symmetrically arranged with successively from high to low totally six pouring holes No. one, No. two, No. three along cambered surface, each pouring hole is to there being the stopple of building rear sealing of hole, described pouring hole is of a size of 50cm × 50cm or 60cm × 60cm, and spacing 100～150cm is provided with many row's plug holes from low to high.

With respect to prior art, beneficial effect of the present invention is: the reinforced concrete U-shaped aqueduct formwork for placing of a kind of nothing that the present invention proposes to pin bolt, overall time is built, there is not horizontal construction joint, again because not using pin bolt, on cell wall, without to pin bolt hole corrosion problem, well solve the defect of existing technique.The present invention, owing to there is no horizontal joint and to pin bolt hole, objectively saying that this body structure of aqueduct is impermeable, just can not produce the destruction occurring because of corrosion, and meanwhile, aqueduct body outer wall is also clean, attractive in appearance.

Accompanying drawing explanation

Fig. 1 is the structural representation of the embodiment of the present invention, wherein, and 1-bed die, 2-external mold, 3-internal mold, 4-girder, the reinforced concrete prefabricated support beam of 5-.

The specific embodiment

Below in conjunction with the drawings and the specific embodiments, the present invention program is described in further detail:

As shown in Figure 1: a kind of nothing is made up of bed die 1, external mold 2, internal mold 3, girder 4 the reinforced concrete U-shaped aqueduct formwork for placing of pin bolt, described bed die 1 is positioned at the external mold 2 that center, whole formwork for placing system bottom arranges for connecting bilateral symmetry, described external mold 2 medial surfaces are the arc of the U-shaped aqueduct of laminating, the vertical setting of lateral surface for ease of supporting, between interior lateral surface, be symmetrical arranged multiple horizontal, longitudinal and oblique supports, inside and outside intermode forms U-shaped aqueduct and builds cavity, and described internal mold 3 is fixing by four vertical shaped steel and girder 4; Described girder 4 is across the main stupefied shaped steel of die tip and external mold 2 outside both sides and is connected.Described template also comprises the reinforced concrete prefabricated support beam 5 that is fixed on internal mold 3 top recess.Described bed die 1 adopts Φ 12 bolts to fix with external mold 2, between internal mold 3 and girder 4, adopt Φ 16 bolts to fix by four vertical shaped steel, girder 4 is connected by Φ 16 bolts and the main stupefied shaped steel of external mold 2, between adjacent formwork for placing, fix with the bolt of Φ 12 at interval of 20～25cm along piece, and use sticking double faced adhesive tape.On described internal mold 3, be symmetrically arranged with successively from high to low totally six pouring holes No. one, No. two, No. three along cambered surface, each pouring hole is to there being the seben of building rear sealing of hole.Described pouring hole is of a size of 50cm × 50cm or 60cm × 60cm, and spacing 100～150cm is provided with many row's plug holes from low to high.

The reinforced concrete U-shaped aqueduct formwork for placing of nothing to pin bolt, concrete steps are:

Step 1, according to the section pattern of aqueduct, according to the size of structure to be onstructed, determine the quantity of required template, using shaped steel and steel plate is one section of design and internal field processing and fabricating that carries out bed die, external mold, internal mold and support system by 2.0～2.5m length;

Step 2, on prefabricated terrace or on falsework by Loft Line, lay bed die, and bolt for adjacent bed die is linked and is reinforced;

Step 3, by assembled section by section to external mold and bed die, adjacent outer intermode adopts bolt to fix;

After step 4, external mold are installed and proofreaied and correct, carry out making and the installation, fixing of aqueduct reinforcing bar;

Step 5, aqueduct reinforcing bar peace utilize crane that internal mold is installed after having made, and carry out section by section the assembled of internal mold, and internal mold top steel main beam and the stupefied shaped steel of external mold master are linked and are integrated by bolt;

After step 6, template installation, before concreting, reinforced concrete prefabricated support beam is placed in to the reserved indent of groove top template;

Step 7, build and front each template installation system is carried out to detailed inspection, remove the wood chip in template, mortar, greasy dirt, earth, guarantee each beam, the installation of post node closely, in continuous placing, guarantee that form lateral pressure is stable, for preventing that crack or surface blemishes from appearring in template inner concrete, template is carried out to maintenance, be specially bedding heat and moisture preserving material, guarantee that temperature is not less than 5 ℃, if indoor/outdoor temperature-difference is greater than 25 ℃, to the template processing of lowering the temperature, when form removable, keep corner complete as far as possible, concrete surface does not damage

Step 8, installation are afterwards used for the end socket template at shutoff groove body two ends, and after reinforce stabilization, carry out the concreting of groove body; Build charging aperture and select successively the pouring hole on internal mold from low to high, until the charging aperture at top, while building by 300～400mm one deck, placement layer by layer layering jolt ramming, often build row's pouring hole stopper by its shutoff, the complete one section of groove of continuous placing is treated concrete coagulation after one's death, carries out afterwards form removal, and form removal process is first removed girder, remove afterwards internal mold, remove again the external mold on both sides, finally remove bed die, after form removal, obtain a complete reinforced concrete U-shaped aqueduct.

The formation of prestressed pore passage is the correct prestressed necessary condition of implementing by design attitude reserving hole channel, is also a cumbersome problem in post tentioned prestressed concrete girder construction.This beam is because reinforcing bar is closeer, and the pipeline of two directions intersects mutually, makes reinforcing bar binding and location of pipeline more difficult.Plan adopts rubber extract pipe pore-forming, but considers that this beam body concrete quantity is large, and infusion time is long, and construction plant is restricted, also dangerous by withdrawing pipe construction inconvenience.Get the continuous beam that fringe conditions is 2 spans and analyze, distribution factor K ₀₁:

$K_{01}=\frac{{\mathrm{\&delta;}}_1^3/h_1}{({\mathrm{\&delta;}}_1^3/{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+{\mathrm{\&delta;}}_2^3/h_2)}---\left(1\right)$

$\begin{array}{c}{M}_{\mathrm{BA}}=M_{\mathrm{BC}}=-q_1{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^2(1-K_{01})/15\\ -K_{01}{h}_2^2(7{\mathrm{<figure-callout\; id="3"\; label="q"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">q</figure-callout>}}_3+8q_2)/120\end{array}---\left(2\right)$

M _B=|M _BA|=|M _BC|

Perpendicular wall span centre, maximal bending moment M ₁,

R _A=q ₁h ₁/6-M _B/h ₁，

$x_1=\sqrt{2R_A{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1/{\mathrm{<figure-callout\; id="1"\; label="q"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">q</figure-callout>}}_1},x_1>0$

$\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="M"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">M</figure-callout>}}_1=R_A{x}_1-q_1{x}_1^3/\left(6h_1\right)\\ =x_1(R_A-q_1{x}^2/(6h_1)(\mathrm{kN}\&CenterDot;m)\end{array}---\left(3\right)$

Swash plate span centre maximal bending moment

0＜x ₂＜h ₂

For fear of occurring quality accident, after use zinc-plated bellows pore-forming instead.Owing to adopting an emblem anchor system, the necessary reaming in duct, two ends, reaming section pipeline section adopts steel sheet pipeline, makes of 0.7mm book steel plate, pounds distortion for preventing that steel pipe from being touched, and during concrete perfusion, one section of steel pipe of pipe liner, extracts internal lining pipe after concrete initial set.

${\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">K</figure-callout>}}_1=\frac{0.75{\mathrm{\&delta;}}_1^3/h_1}{(0.75{\mathrm{\&delta;}}_1^3/{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+{\mathrm{\&delta;}}_2^3/h_2)}$

$\begin{array}{c}{M}_{\mathrm{BA}}^{\&prime;}=-M_{\mathrm{BC}}^{\&prime;}=-K_1(q_2{h}_2^2/20+q_3{h}_2^2/30)\\ -(1-K_1)q_1{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1^2/15\end{array}$

M′ _B=|M′ _BA|=|M′ _BC|，M′ _C=|M _CB|

The maximum curved torch M of riser span centre ₃:

R′ _A=q ₁h ₁/6-M′ _B/h ₁

$x_3=\sqrt{2R_A^{\&prime;}{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1/{\mathrm{<figure-callout\; id="1"\; label="q"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">q</figure-callout>}}_1},x_3>0$

$\begin{array}{c}{\mathrm{<figure-callout\; id="3"\; label="M"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">M</figure-callout>}}_3=R_A^{\&prime;}{x}_3-q_1{x}_3^3/\left(6h_1\right)\\ =x_3(R_A^{\&prime;}-q_1{x}_2^2/(6h_1)(\mathrm{kN}\&CenterDot;m)\end{array}---\left(6\right)$

The maximum curved torch M of swash plate span centre ₄:

R′ _BC=q ₂h ₂/2+(q ₃-q ₂)h ₂/6+(M′ _B-M′ _C)/h ₂

For convenient construction, avoid lashing difficulty, the lashing before the good and sound rear filling concrete of duct bellows of longitudinal prestressing steel speed, one end of steel tendon puts ground tackle, and the good head in emblem, and the other end is worn anchor, emblem head after having filled with concrete and having torn end mould open again.Because being longitudinally interrupted, base plate is provided with discharge gate, thus the fringe conditions that joins of swash plate and base plate, longitudinally also inconsistent, this has also caused each plate longitudinally having moment of flexure, and this also confirms in photoelastic model stress analysis and the finite element analysis of flute profile bunker.For this reason, by rough sledding, determine that vertical bending moment in perpendicular wall and swash plate is respectively:

Apply prestressing force

Steel tendon is accurately blanking on concrete platform, to guarantee being not more than long this beam of 1/5OOOo of bundle in the feature aspect prestressing force with the drafting error of a branch of steel wire, that this is determined in the feature of structure aspect by this new construction, this structure by interim orbit bed board with

Two edge-beams form, and road bed board is in bottom, and area is large and thin, and the building height of impact driving is very little, and it is not only longitudinally, and are laterally applying powerful prestressing force.

Act on the vertical load G1 of perpendicular wall bottom,

$\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="G"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">G</figure-callout>}}_1=1.3\mathrm{\&gamma;}(B-b)(\frac{{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1}{4}+\frac{h_2\sin \mathrm{\&alpha;}}{12})\\ +1.2\&times;25({\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1{\mathrm{\&delta;}}_1+\frac{1}{2}{h}_2{\mathrm{\&delta;}}_2)\end{array}$

Act on the vertical load G2 at node C place:

$\begin{array}{c}{G}_2=\frac{1.3}{4}\mathrm{\&gamma;}{h}_1(B-b)+\frac{1.3}{6}{h}_2(B-b)\\ \&times;\mathrm{\&gamma;}\sin \mathrm{\&alpha;}+\frac{1.2}{2}\mathrm{b\&gamma;}({\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000488519020000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+h_2\sin \mathrm{\&alpha;})\\ +\frac{1.2\&times;25}{2}(h_2{\mathrm{\&delta;}}_2+b{\mathrm{\&delta;}}_3)\end{array}$

This beam, due to concrete shrinkage, supports, and construction method is improper, is easy to occur cracking.Because the span of both direction is in length and breadth all larger, when stretch-draw, to consider the load-bearing of both direction and the problem that cooperatively interacts between them simultaneously.

As follows with swash plate and the corresponding pulling force of perpendicular wall mid span moment maximum point:

Perpendicular wall: N _{1 (3)}=q _aBx ₁(or x ₃)/h ₁(9)

After beam body concrete perfusion, deadweight is only born by support, and along with the carrying out of stretch-draw, beam body will bear gradually conducts oneself with dignity and produces certain camber.Laterally not stretch-draw is longitudinal for stretch-draw, and girder can destroy; Stretch-draw is longitudinal, and road bed board will destroy.And along with the carrying out of stretch-draw, the arch of beam body, support, because pressure amount reduces to produce elastic deformation, can change the deadweight moment of flexure of carriageway plate, also cracking likely of plate upper limb when stretch-draw.In order to prevent the generation in above-mentioned crack, stretch-draw is carried out at twice.Stretch-draw for the first time: poured into stretch-draw as early as possible in latter several days at the solidifying soil of beam body won ton, required concrete strength to reach 7000 of design strength.The object of this stretch-draw, the one, prevent the generation in the cracks such as the solidifying soil of won ton contraction in construction;

The 2nd, to trough girder prestressing force, can support its deadweight, remove bed die.Stretch-draw order is as follows: (1) stretching end crossbeam transverse beam to 50% proof stress.

(2) stretch-draw transverse beam (at interval of) is to 50% proof stress.

(3) a stretch-draw part is longitudinally restrainted to 50% proof stress.

When stretch-draw transverse beam, destroy gradually the beneath support timber wedge of bed board.After transverse beam stretch-draw is for the first time complete, the support timber wedge under road bed board is all destroyed.When stretch-draw is longitudinally restrainted, progressively destroy the support timber wedge under girder.Longitudinally stretch-draw is complete, and support timber wedge is all destroyed.

Stretch-draw for the second time: in the time that concrete reaches design strength, carry out whole stretch-draw.Tension sequence is first horizontal rear vertical, the empty bundle of pretensioning, then mend and draw stretch-draw bundle for the first time.

With section, 3.5mm × 4.5mm(is high), a joint aqueduct of span 20m adopts this technique to construct, and modular shuttering element is made length by 2.0m, a joint aqueduct template material requested is installed as table 1:

The above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, and any variation of expecting without creative work or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.

Claims (2)

1. the reinforced concrete U-shaped aqueduct formwork for placing of nothing to pin bolt, is characterized in that, concrete steps are:

Step 1, according to the section pattern of aqueduct, according to the size of structure to be onstructed, determine the quantity of required template, using shaped steel and steel plate is one section of design and internal field processing and fabricating that carries out bed die, external mold, internal mold and support system by 2.0～2.5m length;

Step 2, on prefabricated terrace or on falsework by Loft Line, lay bed die, and bolt for adjacent bed die is linked and is reinforced;

Step 3, by assembled section by section to external mold and bed die, adjacent outer intermode adopts bolt to fix;

After step 4, external mold are installed and proofreaied and correct, carry out making and the installation, fixing of aqueduct reinforcing bar;

Step 5, aqueduct reinforcing bar peace utilize crane that internal mold is installed after having made, and carry out section by section the assembled of internal mold, and internal mold top steel main beam and the stupefied shaped steel of external mold master are linked and are integrated by bolt;

After step 6, template installation, before concreting, reinforced concrete prefabricated support beam is placed in to the reserved indent of groove top template;

Step 7, build and front each template installation system is carried out to detailed inspection, remove the wood chip in template, mortar, greasy dirt, earth, guarantee each beam, the installation of post node closely, in continuous placing, guarantee that form lateral pressure is stable, for preventing that crack or surface blemishes from appearring in template inner concrete, template is carried out to maintenance, be specially bedding heat and moisture preserving material, guarantee that temperature is not less than 5 ℃, if indoor/outdoor temperature-difference is greater than 25 ℃, to the template processing of lowering the temperature, when form removable, keep corner complete as far as possible, concrete surface does not damage;

Step 8, installation are afterwards used for the end socket template at shutoff groove body two ends, and after reinforce stabilization, carry out the concreting of groove body; Build charging aperture and select successively the pouring hole on internal mold from low to high, until the charging aperture at top, while building by 300～400mm one deck, placement layer by layer layering jolt ramming, often build row's pouring hole stopper by its shutoff, the complete one section of groove of continuous placing is treated concrete coagulation after one's death, carries out afterwards form removal, and form removal process is first removed girder, remove afterwards internal mold, remove again the adventitia on both sides, finally remove bed die, after form removal, obtain a complete reinforced concrete U-shaped aqueduct.

Described in claim 1 without the formwork for placing of reinforced concrete U-shaped aqueduct to pin bolt by bed die, external mold, internal mold, girder composition, the large punching block of described stencil-chosen, steel framework blocking tool, wood plywood, one in bamboo plywood, it is characterized in that, described bed die is positioned at the external mold that center, whole formwork for placing system bottom arranges for connecting bilateral symmetry, described external mold medial surface is the arc of the U-shaped aqueduct of laminating, the vertical setting of lateral surface for ease of supporting, between interior lateral surface, be symmetrical arranged multiple horizontal, longitudinal and oblique support, inside and outside intermode forms U-shaped aqueduct and builds cavity, in, external mold and concrete joint surface are smooth, can not there be other pollutions, described internal mold is fixed by four vertical shaped steel and girder, described girder is across die tip and the stupefied shaped steel of external mold master outside both sides and is connected, described template also comprises the reinforced concrete prefabricated support beam that is fixed on internal mold top recess, described bed die and external mold adopt Φ 12 bolts to fix, between internal mold and girder, adopt Φ 16 bolts to fix by four vertical shaped steel, girder is connected by Φ 16 bolts and the stupefied shaped steel of external mold master, between adjacent formwork for placing, fix with the bolt of Φ 12 at interval of 20～25cm along piece, and with sticking double faced adhesive tape, on described internal mold, be symmetrically arranged with successively from high to low totally six pouring holes No. one, No. two, No. three along cambered surface, each pouring hole is to there being the stopple of building rear sealing of hole, described pouring hole is of a size of 50cm × 50cm or 60cm × 60cm, and spacing 100～150cm is provided with many row's plug holes from low to high.

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