Concrete overall pouring method and structure of hydro-turbine set

Abstract

The present invention discloses a method and structure for integrally pouring concrete for a turbine unit, relating to the technical field of hydropower engineering construction, and aims to improve the pouring construction efficiency and construction quality of the turbine unit structure. The main technical solution of the present invention is as follows: the method for integrally pouring concrete for a turbine unit comprises the following steps: Step 1: prefabricating anchors and steel buttresses. During the pouring of the foundation slab concrete, the anchors and steel buttresses are pre-buried in the foundation slab concrete; Step 2: installing the tailwater diffuser, elbow, and cone, and tightening the anchors after the steel buttresses are installed and reinforced; Step 3: using a level to check the installation elevation of the tailwater diffuser, elbow, and cone, and using a frame level to check the verticality and horizontality of the tailwater diffuser, elbow, and cone; Step 4: using a level to introduce elevation control points near the pouring site, placing a pair of tower rulers on the tailwater diffuser, elbow, and cone, and measuring the elevation values ​​of each site before pouring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water and electricity engineering construction, and particularly relates to a concrete overall pouring method and structure of a hydraulic turbine unit. BACKGROUND

[0002] For general power plant unit concrete construction, in order to install electromechanical equipment, the main body construction process often needs to reserve secondary concrete, and then the electromechanical equipment is installed, and then the secondary concrete is poured. This construction method directly prolongs the overall construction period of the power plant. When the concrete is constructed, the amount of formwork material used is large, and the requirements for the first-stage concrete formwork, the second-stage concrete formwork and the size are high. The reserved equipment foundation space (such as the tail water diffusion pipe, the cone pipe section and the elbow pipe section) is time-consuming and laborious, and the electromechanical equipment can be installed only after the foundation concrete strength reaches 70% of the design value, which directly affects the cycle of electromechanical equipment installation. Before the secondary concrete is poured, the concrete surface at the junction of the first stage and the second stage needs to be chiseled. Just for the chiseling of the junction surface, a construction cold joint is generated between the first-stage concrete and the second-stage concrete, and a leakage phenomenon may occur in the later period. SUMMARY

[0003] Therefore, the present application provides a concrete overall pouring method and structure of a hydraulic turbine unit, and the main purpose is to improve the pouring construction efficiency and construction quality of the hydraulic turbine unit structure.

[0004] To achieve the above purpose, the present application mainly provides the following technical scheme:

[0005] In one aspect, the present application provides a concrete overall pouring method of a hydraulic turbine unit, which comprises the following steps:

[0006] Step 1: Preparing a pull anchor and a steel buttress, and pre-burying the pull anchor and the steel buttress in the foundation bottom plate concrete in advance during pouring of the foundation bottom plate concrete;

[0007] Step 2: When the strength of the foundation bottom plate concrete reaches 70% of the design strength, the tail water diffusion pipe, the elbow pipe and the cone pipe can be installed, the elevation deviation of the steel buttress is controlled to be-5mm to 0mm, the center and distribution position deviation of the tail water diffusion pipe, the elbow pipe and the cone pipe is controlled to be within 10mm, and the horizontal deviation of the tail water diffusion pipe, the elbow pipe and the cone pipe is controlled to be 1mm / m, wherein the pull anchor is pulled tight after the installation and reinforcement of the steel buttress are completed;

[0008] Step three, check the installation elevation of the draft tube diffuser, elbow pipe and cone pipe by using the level, check the perpendicularity and levelness of the draft tube diffuser, elbow pipe and cone pipe by using the frame level, wherein the installation elevation deviation is controlled within 0-3mm, the perpendicularity is controlled within 0.02mm / m, and the levelness is controlled within 0.03mm / m;

[0009] Step four, introduce the elevation control point near the pouring site by using the level, place a pair of staff gauges on the draft tube diffuser, elbow pipe and cone pipe respectively, measure the elevation value of each part before pouring, and record, and ensure that the elevation deviation of the draft tube diffuser, elbow pipe and cone pipe is within ±1mm during pouring;

[0010] Step five, complete the installation and concrete pouring of the spiral case and seat ring according to the construction sequence and control index of steps one to four.

[0011] The purposes of the present application and the technical problems thereof can be further achieved by the following technical measures.

[0012] Optionally, in the step four, the frame level is placed inside the draft tube diffuser, elbow pipe and cone pipe, and the levelness of the draft tube diffuser, elbow pipe and cone pipe is monitored uninterruptedly, so that the levelness is controlled within 0.02mm / m, and the center and distribution position deviation is controlled within 0.3-0.4mm.

[0013] Optionally, during the concrete pouring process, the pouring is carried out symmetrically, layer by layer and region by region, the rising speed of the poured concrete is controlled to be not more than 300mm / h, the height of the poured concrete of each layer is controlled to be 0.5-1m, in the step four, the stability of the draft tube diffuser, elbow pipe and cone pipe is monitored at any time, and the pouring sequence and pouring speed of the concrete in different regions are adjusted in real time according to the actual situation, in the step five, the stability of the spiral case and seat ring is monitored at any time, and the pouring sequence and pouring speed of the concrete in different regions are adjusted in real time according to the actual situation.

[0014] Optionally, after the concrete pouring is completed, the elevations, axes, levelness and perpendicularity of the draft tube diffuser, elbow pipe, cone pipe, spiral case and seat ring are checked again.

[0015] On the other hand, the present application also provides a concrete integral pouring structure of a hydraulic turbine unit, comprising a cone pipe, an elbow pipe, a draft tube diffuser, a plurality of first pull anchors and a plurality of first steel buttresses, the cone pipe, elbow pipe and draft tube diffuser are connected in sequence to form a water flow main pipe, and the plurality of first pull anchors and the plurality of first steel buttresses are arranged alternately along the axial direction of the water flow main pipe.

[0016] Optionally, the tail water diffusion pipe wall is connected to the maintenance drainage pipe.

[0017] Optionally, further comprising a spiral case, a plurality of second anchors and a plurality of second steel buttresses, the plurality of second anchors are arranged in sequence along the extending direction of the flow passage of the spiral case, and the plurality of second steel buttresses are distributed on both sides of the arrangement track of the second anchors.

[0018] Optionally, further comprising an anchor bolt, the lower end of the anchor bolt is fixedly connected to a transverse steel bar, the transverse steel bar is embedded in concrete, and the upper end of the anchor bolt is pulled tight to the spiral case.

[0019] By the above technical solution, the present application has at least the following advantages:

[0020] (1) The civil engineering and equipment installation can be simultaneously constructed, the construction period is obviously shortened, and the civil engineering support (formwork, support system) materials are obviously reduced. The cutoff wall, the unit diffusion section, the elbow pipe and the taper pipe are integrally poured, the reserved two-stage concrete contact surface chiseling construction is avoided, the water leakage problem caused by the construction joint is solved, the steel lining and the concrete are seamlessly connected during pouring, the roughness of the diffusion pipe to the tail water is reduced, and the water flow is smoother;

[0021] (2) The method is simple, and the measurement and positioning are accurate. The unit tail water diffusion section, the elbow pipe and the taper pipe concrete of the unit can be synchronously poured with the downstream tail water cutoff wall, the integrity is ensured, the anti-leakage effect is obviously enhanced, the tail water diffusion section, the elbow pipe, the taper pipe and the tail water cutoff wall are smoothly transitioned and seamlessly combined, and no error platform is generated. The water resistance phenomenon caused by the error platform of the tail water chamber is reduced, the abrasion of the water flow to the concrete is reduced, the water flow in the flow passage is more stable and smooth, and the reliability and stability of the hydraulic turbine are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A cross-sectional view of a concrete integral pouring structure of a hydraulic turbine unit is provided for the embodiments of the present application.

[0023] Figure 2 For Figure 1 An enlarged view of the A portion in the middle.

[0024] The reference signs in the drawings of the specification include: foundation slab concrete 1, tail water diffusion pipe 2, elbow pipe 3, taper pipe 4, spiral case 5, seat ring 6, first anchor 7, first steel buttress 8, maintenance drainage pipe 9, second anchor 10 and second steel buttress 11. DETAILED DESCRIPTION

[0025] To further clarify the technical hand of the present application and the effect achieved by the technical hand for reaching the predetermined object of the present application, the following will be described in detail in combination with the drawings and preferred embodiments, the specific implementation, structure, features and effects according to the present application. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0026] The present application will be further described in detail in combination with the drawings and embodiments.

[0027] As shown in Figure 1 , in one aspect, an embodiment of the present application provides a method for pouring concrete of a hydraulic turbine unit, which comprises the following steps.

[0028] Step two, when the strength of the foundation bottom plate concrete 1 reaches 70% of the design strength, the installation of the tail water diffuser pipe 2, elbow pipe 3 and cone pipe 4 can be carried out, the elevation deviation of the steel support pier is controlled within-5mm to 0mm, the center and distribution position deviation of the tail water diffuser pipe 2, elbow pipe 3 and cone pipe 4 is controlled within 10mm, and the horizontal deviation of the tail water diffuser pipe 2, elbow pipe 3 and cone pipe 4 is controlled within 1mm / m, wherein, after the installation and reinforcement of the steel support pier is completed, the anchor, jack and wedge plate are tightened, and if necessary, they are fixed and welded firmly by using a welding machine;

[0029] Step three, the installation elevation of the tail water diffuser pipe 2, elbow pipe 3 and cone pipe 4 is checked by using a level, and the perpendicularity and levelness of the tail water diffuser pipe 2, elbow pipe 3 and cone pipe 4 are checked by using the frame level, wherein, the installation elevation deviation is controlled within 0 to +3mm, the perpendicularity is controlled within 0.02mm / m, and the levelness is controlled within 0.03mm / m;

[0030] Step four, using a level to introduce the elevation control point near the pouring site, a pair of tower scale is placed on the tail water diffusion pipe 2, elbow pipe 3 and the cone pipe 4, respectively, the elevation value of each part is measured before pouring, and is recorded, during the pouring process, the elevation deviation of the tail water diffusion pipe 2, elbow pipe 3 and the cone pipe 4 is ensured to be within ±1mm, the frame level is placed inside the tail water diffusion pipe 2, elbow pipe 3 and the cone pipe 4, and the levelness of the tail water diffusion pipe 2, elbow pipe 3 and the cone pipe 4 is monitored uninterruptedly to control the levelness to be 0.02mm / m, the center and distribution position deviation is controlled to be 0.3mm to 0.4mm, the concrete pouring process should be symmetric, layered and regional, the rising speed of the pouring concrete is controlled to be not more than 300mm / h, the concrete height of each layer is controlled to be 0.5 to 1m, the stability of the tail water diffusion pipe 2, elbow pipe 3 and the cone pipe 4 is monitored at any time, and the pouring sequence and pouring speed of the concrete in different regions are adjusted at any time according to the actual situation, after the concrete pouring is completed, the elevation, axis, levelness and perpendicularity of the tail water diffusion pipe 2, elbow pipe 3 and the cone pipe 4 are checked again;

[0031] Step five, the installation and concrete pouring of the spiral case 5 and the seat ring 6 are completed according to the construction sequence and control index of step one to step four, the stability of the spiral case 5 and the seat ring 6 is monitored at any time during the concrete pouring process, and the pouring sequence and pouring speed of the concrete in different regions are adjusted at any time according to the actual situation, after the concrete pouring is completed, the elevation, axis, levelness and perpendicularity of the spiral case 5 and the seat ring 6 are checked again.

[0032] In order to prevent the tail water diffusion section, elbow pipe 3, cone pipe 4, spiral case 5 and seat ring 6 from deforming during the pouring process, the key is to control the rising rate of the concrete pouring.

[0033] Using the concrete integral pouring method of the water turbine unit, the following advantages are obtained:

[0034] (1) The civil engineering and equipment installation can be constructed at the same time, the construction period is obviously shortened, and the materials of civil engineering support (formwork, support system) are obviously reduced. The cutoff wall and the unit diffusion section, elbow pipe 3 and cone pipe 4 are integrally poured, the chiseling construction of the reserved two-stage concrete contact surface is avoided, the leakage problem caused by the construction joint is solved, the steel lining and the concrete are seamlessly connected during pouring, the roughness from the diffusion pipe to the tail water is reduced, and the water flow is smoother;

[0035] (2) The method is simple, and the measurement and positioning are accurate. The tail water diffusion section, elbow pipe 3 and cone pipe 4 of the machine set are integrally poured, which can be synchronously poured with the tail water anti-seepage wall downstream, thereby ensuring the integrity, obviously enhancing the anti-seepage effect, smoothly transitioning the tail water diffusion section, elbow pipe 3, cone pipe 4 and tail water anti-seepage wall and seamlessly combining them, avoiding the misalignment, reducing the water resistance phenomenon of the tail water chamber caused by the misalignment, reducing the erosion of the water flow to the concrete, making the water flow in the flow passage more stable and smooth, and guaranteeing the reliability and stability of the water turbine.

[0036] Taking the concrete pouring of the water turbine set with the same scale as an example, the construction progress of the integrally poured and the staged poured concrete of the spiral case is compared, as shown in the following table:

[0037]

[0038]

[0039] Note: The same work before pouring (such as side wall steel bar binding and side wall formwork support) is not compared.

[0040] As shown in Figure 1 On the other hand, another embodiment of the present application also provides a water turbine set integrally poured concrete structure, which comprises a cone pipe 4, an elbow pipe 3, a tail water diffusion pipe 2, a plurality of first pull anchors 7 and a plurality of first steel buttresses 8. The cone pipe 4, the elbow pipe 3 and the tail water diffusion pipe 2 are sequentially connected to form a water flow main pipe, and the plurality of first pull anchors 7 and the plurality of first steel buttresses 8 are alternately arranged along the axial direction of the water flow main pipe.

[0041] In the embodiment, specifically, the plurality of first steel buttresses 8 synchronously abut against the lower side of the water flow main pipe, the plurality of first pull anchors 7 synchronously pull the water flow main pipe, and the plurality of first pull anchors 7 and the plurality of first steel buttresses 8 are alternately arranged along the axial direction of the water flow main pipe, thereby achieving the purpose of fixing the positions of the cone pipe 4, the elbow pipe 3 and the tail water diffusion pipe 2, avoiding the axial deflection of the cone pipe 4, the elbow pipe 3 and the tail water diffusion pipe 2 during the concrete pouring, thereby avoiding the water leakage at the joint of the cone pipe 4, the elbow pipe 3 and the tail water diffusion pipe 2, and guaranteeing the pouring quality of the water turbine set.

[0042] In the specific embodiment, the pipe wall of the tail water diffusion pipe 2 is connected to the maintenance drainage pipe 9.

[0043] In the embodiment, specifically, the maintenance drainage pipe 9 is connected to the lower side of the pipe wall of the tail water diffusion pipe 2, and when the water turbine set needs to be maintained, the operator can drain the residual water in the water flow main pipe from the maintenance drainage pipe 9.

[0044] In the specific embodiment, the volute 5, a plurality of second pull anchors 10 and a plurality of second steel buttresses 11 are further included, the plurality of second steel buttresses 11 are arranged in sequence along the flow direction of the volute 5, and the plurality of second pull anchors 10 are distributed on both sides of the arrangement track of the second steel buttresses 11.

[0045] In the specific embodiment, the plurality of second steel buttresses 11 abut against the lower surface of the volute 5 respectively, the plurality of second steel buttresses 11 are arranged in sequence along the flow direction of the volute 5, thereby synchronously bearing the weight of the volute 5; on this basis, the plurality of second pull anchors 10 pull the volute 5 on both sides of the arrangement track of the second steel buttresses 11, thereby avoiding the position deviation of the volute 5 relative to the plurality of second steel buttresses 11, and improving the position stability of the volute 5.

[0046] As shown in Figure 1 and Figure 2 In the specific embodiment, the anchor bolt 12 is further included, the lower end of the anchor bolt 12 is fixedly connected to the transverse steel bar 13, the transverse steel bar 13 is embedded in the concrete, and the upper end of the anchor bolt 12 is pulled to the volute 5 through a nut.

[0047] In the specific embodiment, the transverse steel bar 13 is embedded, thereby increasing the fastness of the anchor bolt 12 in the concrete, and further improving the stability of the volute 5 relative to the concrete foundation.

[0048] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for integrally pouring concrete for a hydraulic turbine unit, characterized in that: The integral concrete casting structure of the turbine unit to be cast includes: A tapered pipe, an elbow pipe, a tailrace diffuser, a plurality of first anchors, a plurality of first steel buttresses, a volute, a plurality of second anchors, and a plurality of second steel buttresses, wherein the tapered pipe, the elbow pipe, and the tailrace diffuser are sequentially connected to form a water flow main pipe, the plurality of first anchors and the plurality of first steel buttresses are alternately arranged along the axial direction of the water flow main pipe, the plurality of second anchors are sequentially arranged along the flow channel extension direction of the volute, and the plurality of second steel buttresses are evenly distributed on both sides of the arrangement trajectory of the second anchors; The method comprises the following steps: Step 1: prefabricate anchors and steel buttresses, and embed the anchors and steel buttresses in the foundation slab concrete in advance during the pouring of the foundation slab concrete; Step 2: When the concrete strength of the foundation slab reaches 70% of the design strength, the tailwater diffuser, elbow pipe, and cone pipe can be installed. The elevation deviation of the steel buttress is controlled within -5 mm to 0 mm, the center and distribution position deviations of the tailwater diffuser, elbow pipe, and cone pipe are controlled within 10 mm, and the horizontal deviations of the tailwater diffuser, elbow pipe, and cone pipe are controlled within 1 mm / m. After the installation and reinforcement of the steel buttress are completed, the anchor is tightened. Step 3: Use a level to check the installation elevation of the tailwater diffuser, the elbow pipe, and the tapered pipe, and use a frame level to check the verticality and horizontality of the tailwater diffuser, the elbow pipe, and the tapered pipe, wherein the installation elevation deviation is controlled within 0 to +3 mm, the verticality is controlled within 0.02 mm / m, and the horizontality is controlled within 0.03 mm / m; Step 4: Use a level to introduce elevation control points near the casting site. Place a pair of tower rulers on the tailwater diffuser, the elbow, and the tapered pipe. Measure the elevation values ​​of each part before casting and record them. During the casting process, ensure that the elevation deviation of the tailwater diffuser, the elbow, and the tapered pipe is within ±1 mm. Step 5: Complete the installation of the volute and seat ring and pour concrete according to the construction sequence and control indicators of steps 1 to 4.

2. The method for integrally pouring concrete for a water turbine unit according to claim 1, characterized in that: In step 4, a frame level is placed inside the tailwater diffuser, the elbow pipe and the tapered pipe to continuously monitor the levelness of the tailwater diffuser, the elbow pipe and the tapered pipe so that the levelness is controlled at 0.02 mm / m and the center and distribution position deviation is controlled at 0.3 mm to 0.4 mm.

3. The method for integrally pouring concrete for a water turbine unit according to claim 1, characterized in that: During the concrete pouring process, it should be carried out symmetrically, in layers, and in regions. The rising speed of the poured concrete should be controlled not to exceed 300 mm / h, and the height of the poured concrete in each layer should be controlled between 0.5 and 1 m. In the step 4, the stability of the tailwater diffuser, the elbow pipe, and the cone pipe should be monitored in real time, and the pouring order and pouring speed of the concrete in different regions should be adjusted at any time according to the actual situation. In the step 5, the stability of the volute and the seat ring should be monitored in real time, and the pouring order and pouring speed of the concrete in different regions should be adjusted at any time according to the actual situation.

4. The method for integrally pouring concrete for a water turbine unit according to claim 3, characterized in that: After the concrete pouring is completed, check the elevation, axis, horizontality and verticality of the tailwater diffuser, the elbow pipe, the cone pipe, the volute and the seat ring.

5. The integral pouring method of concrete for a water turbine unit according to claim 1, characterized in that: The pipe wall of the tailwater diffusion pipe is connected to the maintenance drainage pipe.

6. The method for integrally pouring concrete for a water turbine unit according to claim 1, characterized in that: It also includes anchor bolts, the lower ends of which are fixedly connected to transverse steel bars embedded in concrete, and the upper ends of which are tightened on the volute.

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