CN104565530A - Installation method for composite bent pipe segment of hydropower station pressure pipe and method for acquiring rotary installation angle of composite bent pipe segment - Google Patents

Abstract

The invention discloses an installation method for a composite bent pipe segment of a hydropower station pressure pipe and a method for acquiring the rotary installation angle of the composite bent pipe segment, and aims to solve the problem of high difficulty in installation and measurement and control construction of the composite bent pipe segment of the hydropower station pressure pipe. The installation method comprises the following steps: (a) before installation, performing alignment marking on each pipe joint of the pressure pipe; (b) during installation, centering the first pipe joint of the composite bent pipe adjacent to the tail end pipe joint of an upstream straight pipe segment with the tail end pipe joint of the upstream straight pipe segment; (c) rotating the first pipe joint of the composite bent pipe by a rotary installation angle to complete installation of the first pipe joint of the composite bent pipe; (d) hanging the subsequent pipe joints of the composite bent pipe in sequence in such a manner that the center line of a previous pipe is centered with the center line of a next pipe till installation of the whole composite bent pipe is finished. By adopting the installation method and the acquisition method, the key technical problem of high field installation construction difficulty of a large-pipe-diameter composite bent pipe is solved, and the working efficiency is greatly increased.

Description

A kind of pressure pipe in hydraulic power station composite bent pipeline section installation method and acquisition composite bent pipeline section rotate the method for established angle

Technical field

The present invention relates to a kind of pressure pipe in hydraulic power station composite bent pipeline section installation method and obtain the method that composite bent pipeline section rotates established angle, be mainly applicable to in-site installation and the observing and controlling of water power plant Large Diameter Pipeline multitube joint penstock composite-curve.

Background technique

In fact composite-curve is exactly the bend pipe on a certain tapered plane in space.When steel pipe not only deposits corner in the horizontal plane but also have the corner on vertical, and during two corner close together, composite-curve is all set usually and connects.Under existing construction technology condition, straight line steel pipe, horizontal plane bend pipe, facade bend pipe and can the installation method of pipe with small pipe diameter composite-curve of integral installation relatively simple, the joint installation of composite-curve of Large Diameter Pipeline multitube and the observing and controlling then steel pipe in-site installation one large difficult point of constructing often, careless slightly, just likely cause the alignment error exceeding specification permission, worsen bend pipe stress condition, affect steel-pipe construction safety, even there is setup error, cause bend pipe to scrap to do over again, not only increase construction cost, and affect the duration.

Summary of the invention

For pressure pipe in hydraulic power station composite-curve, the feature large with observing and controlling difficulty of construction is installed, the present invention aims to provide a kind of pressure pipe in hydraulic power station composite bent pipeline section installation method, this installation method can solve the large key technical problem of Large Diameter Pipeline multitube joint composite-curve in-site installation difficulty of construction, increases work efficiency.

To achieve these goals, the technical solution adopted in the present invention is:

A kind of pressure pipe in hydraulic power station composite bent pipeline section installation method, is characterized in, comprises the steps:

A), before installing, crosshair mark is carried out to each tube coupling of pressure tube;

When b) installing, by first tube coupling of the composite-curve adjacent with upstream straight length end tube coupling and upstream straight length end tube coupling centering;

C) then first of composite-curve tube coupling is rotated the angle that rotates established angle ω, complete the installation of composite-curve first tube coupling;

D) the follow-up tube coupling of composite-curve mounts, until complete the installation of whole composite-curve successively by the method for the next tube hub line of a upper tube hub line centering.

Be below the technological scheme of further improvement of the present invention:

Rotate the method for established angle ω as a kind of acquisition specifically, described rotation established angle ω adopts space vector method to obtain; According to composite-curve space geometry relation, try to achieve characteristic point coordinate on space composite-curve place tapered plane and vertical or horizontal plane, and in two planes, write out two intersecting vectors respectively, again according to vector product calculation rule, calculate the normal vector of two planes, finally utilize vectorial cosine formula to solve composite-curve and rotate established angle ω.

Further, the acquisition of described rotation established angle ω comprises the steps:

1) characteristic point coordinate is asked;

Known: the gradient α of upstream straight length; The gradient β of downstream straight length; Upstream straight tube axis and downstream straight tube axis projection angle γ in the horizontal plane;

If AG=1, OG=1; O point is true origin; Suppose: ∠ IKJ=θ, then ∠ OKM=γ-θ;

In Rt Δ AEG, known AG=1, ∠ AGE=α, obtains EG, and IK=EG;

In Rt Δ IJK, known IK and ∠ IKJ=θ; Obtain IJ, KJ;

In Rt Δ OKG, known OG=1 and ∠ GOK=β; Obtain OK;

In Rt Δ OMK, known OK and ∠ OKM=γ-θ; Obtain KM;

In Δ IKM, known IK, KM and ∠ IKJ=θ; The triangle cosine law is utilized to obtain IM;

In Rt Δ IJM, three limits all use the algebraic expression containing θ to express, and according to the Pythagorean theorem, establish an equation and obtain θ;

Utilize the θ tried to achieve, write out the coordinate of the characteristic point O on vertical guide ACKI and tapered plane AGO, A, G, C, K, I point respectively;

2) planar process vector is asked;

The coordinate of the characteristic point required by step 1), obtains the vector that vertical guide ACKI two is crossing with two crossing vectors upper with tapered plane AGO with

According to vector product calculation rule, calculate the normal vector of vertical guide ACKI and tapered plane AGO respectively with

$\stackrel{\→}{n1}=\stackrel{\→}{\mathrm{AK}}\×\stackrel{\→}{\mathrm{CI}}---\left(1\right)$

$\stackrel{\→}{n2}=\stackrel{\→}{\mathrm{OG}}\×\stackrel{\→}{\mathrm{OA}}---\left(2\right)$

3) dihedral angle ω is asked;

The vertical guide ACKI tried to achieve by normal vector representation (1), (2) and the normal vector of inclined-plane AGO , utilize vectorial cosine formula to obtain with angle ε, then rotate established angle and be dihedral angle and be:

Rotate the method for established angle ω as the acquisition that another kind is concrete, when an axis any in the tubular axis line of composite-curve upstream and downstream is horizontal line, adopt geometrograph to obtain described rotation established angle ω.Further, the acquisition of described rotation established angle ω comprises the steps:

1) plane is taken up an official post work for composite-curve central angle, cross the vertical line that O point makes straight line AG, hand over AG elongation line in C point;

2) with C point for the center of circle, line segment CO length is radius, makes semicircle C;

3) ∠ AGO is made "=γ, γ be composite-curve projected angle in the horizontal plane, hands over CO in O " point;

4) O is crossed " put the parallel lines O making straight line AC " O ', hand over the circular arc of semicircle C in O ' point;

5) connect C point and O ' point, then ∠ OCO ' is and rotates established angle ω.

Second goal of the invention of the present invention is to provide a kind of method obtaining composite bent pipeline section rotation established angle, is characterized in, comprises the steps:

1) characteristic point coordinate is asked;

Known: the gradient α of upstream straight length; The gradient β of downstream straight length; Upstream straight tube axis and downstream straight tube axis projection angle γ in the horizontal plane;

If AG=1, OG=1; O point is true origin; Suppose: ∠ IKJ=θ, then ∠ OKM=γ-θ;

In Rt Δ AEG, known AG=1, ∠ AGE=α, obtains EG, and IK=EG;

In Rt Δ IJK, known IK and ∠ IKJ=θ; Obtain IJ, KJ;

In Rt Δ OKG, known OG=1 and ∠ GOK=β; Obtain OK;

In Rt Δ OMK, known OK and ∠ OKM=γ-θ; Obtain KM;

In Δ IKM, known IK, KM and ∠ IKJ=θ; The triangle cosine law is utilized to obtain IM;

In Rt Δ IJM, three limits all use the algebraic expression containing θ to express, and according to the Pythagorean theorem, establish an equation and obtain θ;

Utilize the θ tried to achieve, write out the coordinate of the characteristic point O on vertical guide ACKI and tapered plane AGO, A, G, C, K, I point respectively;

2) planar process vector is asked;

The coordinate of the characteristic point required by step 1), obtains the vector that vertical guide ACKI two is crossing with two crossing vectors upper with tapered plane AGO with

According to vector product calculation rule, calculate the normal vector of vertical guide ACKI and tapered plane AGO respectively with

$\stackrel{\→}{n1}=\stackrel{\→}{\mathrm{AK}}\×\stackrel{\→}{\mathrm{CI}}---\left(1\right)$

$\stackrel{\→}{n2}=\stackrel{\→}{\mathrm{OG}}\×\stackrel{\→}{\mathrm{OA}}---\left(2\right)$

3) dihedral angle ω is asked;

The vertical guide ACKI tried to achieve by normal vector representation (1), (2) and the normal vector of inclined-plane AGO , utilize vectorial cosine formula to obtain with angle ε, then rotate established angle and be dihedral angle and be:

Second goal of the invention of the present invention is to provide the another kind of method obtaining composite bent pipeline section rotation established angle, and in the tubular axis line of described composite-curve upstream and downstream, any axis is horizontal line; Be characterized in, comprise the steps:

1) plane is taken up an official post work for composite-curve central angle, cross the vertical line that O point makes straight line AG, hand over AG elongation line in C point;

2) with C point for the center of circle, line segment CO length is radius, makes semicircle C;

3) ∠ AGO is made "=γ, γ be composite-curve projected angle in the horizontal plane, hands over CO in O " point;

4) O is crossed " put the parallel lines O making straight line AC " O ', hand over the circular arc of semicircle C in O ' point;

5) connect C point and O ' point, then ∠ OCO ' is and rotates established angle ω.

Compared with prior art, the invention has the beneficial effects as follows: installation method of the present invention adopts geometric projection comparatively before or directly sets up the way that obtaining three-dimensional model rotates established angle, have and be easily understood, convenient and swift, the feature of time and labour saving, be particularly horizontal special circumstances for an axis any in the tubular axis line of composite-curve upstream and downstream, then creatively propose one and do not carry out numerical calculation, CAD is directly utilized to carry out geometric construction, just can the method for convenient, succinct, fast and accurate acquisition composite-curve rotation established angle.

In a word, the invention solves the key technical problem that Large Diameter Pipeline composite-curve in-site installation difficulty of construction is large, substantially increase working efficiency.

Accompanying drawing explanation

Fig. 1 is the geometrical relationship schematic diagram of composite-curve of the present invention;

Fig. 2 is the CAD geometrograph schematic diagram of composite-curve of the present invention.

Embodiment

The invention will be further described for example to rotate the numerical method of established angle and geometrograph with composite-curve below.

When steel pipe manufactures, the tube wall of each tube coupling marks upper and lower, left and right directrix.During penstock installation, first the 1st tube coupling of (upstream straightway end tube coupling) adjacent composite-curve will be saved by common tube coupling centering with location, the angle of the rotation the established angle then method that embodiment 1 or embodiment 2 are pressed in the rotation one of composite-curve head joint obtained, first joint can be completed install, after first joint accurately mounts, follow-up tube coupling just can mount by the method for center to center successively, finally completes the installation of whole composite-curve.

Embodiment 1 rotates the numeric value analysis algorithm of setting angle

According to composite-curve space geometry relation, try to achieve characteristic point coordinate on space composite-curve place tapered plane and vertical or horizontal plane, and in two planes, write out two intersecting vectors respectively, again according to vector product calculation rule, calculate the normal vector of two planes, finally utilize vectorial cosine formula to solve composite-curve and rotate established angle.

As shown in Figure 1, space law vector method is adopted to solve ω, concrete point following step:

(1) characteristic point coordinate is asked.Known: the gradient α of upstream straight length; The gradient β of downstream straight length; Upstream and downstream straight tube two axial lines projection angle γ in the horizontal plane.If AG=1, OG=1; O point is true origin; According to analysis, each characteristic point coordinate be tried to achieve, also need to obtain ∠ IKJ.Suppose: ∠ IKJ=θ, then ∠ OKM=γ-θ.In Rt Δ AEG, known AG=1, ∠ AGE=α; Can EG be obtained, and IK=EG.In Rt Δ IJK, known IK and ∠ IKJ=θ; IJ, KJ can be obtained.In Rt Δ OKG, known OG=1 and ∠ GOK=β; OK can be obtained.In Rt Δ OMK, known OK and ∠ OKM=γ-θ; KM can be obtained.In Δ IKM, known IK, KM and ∠ IKJ=θ; The triangle cosine law is utilized to obtain IM.Last in Rt Δ IJM, three limits all use the algebraic expression containing θ to express, and according to the Pythagorean theorem, establish an equation and can obtain θ.Like this, utilize known θ, the coordinate of the characteristic point O on vertical guide ACKI and tapered plane AGO, A, G, C, K, I point can be write out respectively.

(2) planar process vector is asked.The coordinate of the characteristic point required by (1), can obtain the vector that vertical guide ACKI two is crossing with two crossing vectors upper with tapered plane AGO with .According to vector product calculation rule, the normal vector of vertical guide ACKI and tapered plane AGO can be calculated respectively with

$\stackrel{\→}{n1}=\stackrel{\→}{\mathrm{AK}}\×\stackrel{\→}{\mathrm{CI}}---\left(1\right)$

$\stackrel{\→}{n2}=\stackrel{\→}{\mathrm{OG}}\×\stackrel{\→}{\mathrm{OA}}---\left(2\right)$

(3) dihedral angle ω is asked.The vertical guide ACKI tried to achieve by formula (1), (2) and the normal vector of inclined-plane AGO vectorial cosine formula is utilized to obtain with angle ε, then dihedral angle ω is

Embodiment 2 rotates the geometric construction solving method of setting angle

Be horizontal special circumstances for an axis any in the tubular axis line of composite-curve upstream and downstream, then directly utilize CAD to carry out geometric construction, obtain composite-curve and rotate established angle.As shown in Figure 2, rotating established angle ω adopts CAD geometric construction step specific as follows:

1) plane is taken up an official post work for composite-curve central angle, cross the vertical line that O point makes straight line AG, hand over AG elongation line in C point;

2) with C point for the center of circle, line segment CO length is radius, makes semicircle C;

3) ∠ AGO is made "=γ, γ be composite-curve projected angle in the horizontal plane, hands over CO in O " point;

4) O is crossed " put the parallel lines O making straight line AC " O ', hand over the circular arc of semicircle C in O ' point;

5) C point and O ' point is connected, then required by ∠ OCO '=ω is.

In order to verify the precision of above-mentioned CAD geometrograph, the mapping results of No. N5, smooth for Lu Debaluo Leix pressure steel pipe of hydropower station with two composite-curves in NS10 anchor block is contrasted, in table 1 with adopting the solving result of space vector analytic method.As seen from table, the result of calculation of CAD geometrograph and analytic method is almost completely the same, has higher precision.

Table 1CAD geometric construction and the numerical solution precision table of comparisons

The content that above-described embodiment is illustrated should be understood to these embodiments only for being illustrated more clearly in the present invention, and be not used in and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.

Claims (7)

1. a pressure pipe in hydraulic power station composite bent pipeline section installation method, is characterized in that, comprise the steps:

A), before installing, crosshair mark is carried out to each tube coupling of pressure tube;

When b) installing, by first tube coupling of the composite-curve adjacent with upstream straight length end tube coupling and upstream straight length end tube coupling centering;

C) then first of composite-curve tube coupling is rotated the angle that rotates established angle ω, complete the installation of composite-curve first tube coupling;

D) the follow-up tube coupling of composite-curve mounts, until complete the installation of whole composite-curve successively by the method for the next tube hub line of a upper tube hub line centering.

2. pressure pipe in hydraulic power station composite bent pipeline section installation method according to claim 1, is characterized in that, described rotation established angle ω adopts space vector method to obtain; According to composite-curve space geometry relation, try to achieve characteristic point coordinate on space composite-curve place tapered plane and vertical or horizontal plane, and in two planes, write out two intersecting vectors respectively, again according to vector product calculation rule, calculate the normal vector of two planes, finally utilize vectorial cosine formula to solve composite-curve and rotate established angle ω.

3. pressure pipe in hydraulic power station composite bent pipeline section installation method according to claim 2, is characterized in that, the acquisition of described rotation established angle ω comprises the steps:

1) characteristic point coordinate is asked;

Known: the gradient α of upstream straight length; The gradient β of downstream straight length; Upstream straight tube axis and downstream straight tube axis projection angle γ in the horizontal plane;

If AG=1, OG=1; O point is true origin; Suppose: ∠ IKJ=θ, then ∠ OKM=γ-θ;

In Rt Δ AEG, known AG=1, ∠ AGE=α, obtains EG, and IK=EG;

In Rt Δ IJK, known IK and ∠ IKJ=θ; Obtain IJ, KJ;

In Rt Δ OKG, known OG=1 and ∠ GOK=β; Obtain OK;

In Rt Δ OMK, known OK and ∠ OKM=γ-θ; Obtain KM;

In Δ IKM, known IK, KM and ∠ IKJ=θ; The triangle cosine law is utilized to obtain IM;

In Rt Δ IJM, three limits all use the algebraic expression containing θ to express, and according to the Pythagorean theorem, establish an equation and obtain θ;

Utilize the θ tried to achieve, write out the coordinate of the characteristic point O on vertical guide ACKI and tapered plane AGO, A, G, C, K, I point respectively;

2) planar process vector is asked;

The coordinate of the characteristic point required by step 1), obtains the vector that vertical guide ACKI two is crossing with two crossing vectors upper with tapered plane AGO with

According to vector product calculation rule, calculate the normal vector of vertical guide ACKI and tapered plane AGO respectively with

$\stackrel{\→}{n1}=\stackrel{\→}{\mathrm{AK}}\×\stackrel{\→}{\mathrm{CI}}---\left(1\right)$

$\stackrel{\→}{n2}=\stackrel{\→}{\mathrm{OG}}\×\stackrel{\→}{\mathrm{OA}}---\left(2\right)$

3) dihedral angle ω is asked;

The vertical guide ACKI tried to achieve by normal vector representation (1), (2) and the normal vector of inclined-plane AGO , utilize vectorial cosine formula to obtain with angle ε, then rotate established angle and be dihedral angle and be:

4. pressure pipe in hydraulic power station composite bent pipeline section installation method according to claim 1, is characterized in that, when an axis any in the tubular axis line of composite-curve upstream and downstream is horizontal line, adopts geometrograph to obtain described rotation established angle ω.

5. pressure pipe in hydraulic power station composite bent pipeline section installation method according to claim 4, is characterized in that, the acquisition of described rotation established angle ω comprises the steps:

1) plane is taken up an official post work for composite-curve central angle, cross the vertical line that O point makes straight line AG, hand over AG elongation line in C point;

2) with C point for the center of circle, line segment CO length is radius, makes semicircle C;

3) ∠ AGO is made "=γ, γ be composite-curve projected angle in the horizontal plane, hands over CO in O " point;

4) O is crossed " put the parallel lines O making straight line AC " O ', hand over the circular arc of semicircle C in O ' point;

5) connect C point and O ' point, then ∠ OCO ' is and rotates established angle ω.

6. obtain the method that composite bent pipeline section rotates established angle, it is characterized in that, comprise the steps:

1) characteristic point coordinate is asked;

Known: the gradient α of upstream straight length; The gradient β of downstream straight length; Upstream straight tube axis and downstream straight tube axis projection angle γ in the horizontal plane;

If AG=1, OG=1; O point is true origin; Suppose: ∠ IKJ=θ, then ∠ OKM=γ-θ;

In Rt Δ AEG, known AG=1, ∠ AGE=α, obtains EG, and IK=EG;

In Rt Δ IJK, known IK and ∠ IKJ=θ; Obtain IJ, KJ;

In Rt Δ OKG, known OG=1 and ∠ GOK=β; Obtain OK;

In Rt Δ OMK, known OK and ∠ OKM=γ-θ; Obtain KM;

In Δ IKM, known IK, KM and ∠ IKJ=θ; The triangle cosine law is utilized to obtain IM;

In Rt Δ IJM, three limits all use the algebraic expression containing θ to express, and according to the Pythagorean theorem, establish an equation and obtain θ;

Utilize the θ tried to achieve, write out the coordinate of the characteristic point O on vertical guide ACKI and tapered plane AGO, A, G, C, K, I point respectively;

2) planar process vector is asked;

The coordinate of the characteristic point required by step 1), obtains the vector that vertical guide ACKI two is crossing with two crossing vectors upper with tapered plane AGO with

According to vector product calculation rule, calculate the normal vector of vertical guide ACKI and tapered plane AGO respectively with

$\stackrel{\→}{n1}=\stackrel{\→}{\mathrm{AK}}\×\stackrel{\→}{\mathrm{CI}}---\left(1\right)$

$\stackrel{\→}{n2}=\stackrel{\→}{\mathrm{OG}}\×\stackrel{\→}{\mathrm{OA}}---\left(2\right)$

3) dihedral angle ω is asked;

The vertical guide ACKI tried to achieve by normal vector representation (1), (2) and the normal vector of inclined-plane AGO , utilize vectorial cosine formula to obtain with angle ε, then rotate established angle and be dihedral angle and be:

7. obtain the method that composite bent pipeline section rotates established angle, in the tubular axis line of described composite-curve upstream and downstream, any axis is horizontal line; It is characterized in that, comprise the steps:

1) plane is taken up an official post work for composite-curve central angle, cross the vertical line that O point makes straight line AG, hand over AG elongation line in C point;

2) with C point for the center of circle, line segment CO length is radius, makes semicircle C;

3) ∠ AGO is made "=γ, γ be composite-curve projected angle in the horizontal plane, hands over CO in O " point;

4) O is crossed " put the parallel lines O making straight line AC " O ', hand over the circular arc of semicircle C in O ' point;

5) connect C point and O ' point, then ∠ OCO ' is and rotates established angle ω.