Hydropower station surge chamber side wall concrete lining slip form system based on electroosmosis demolding and construction method

Abstract

The invention discloses a hydropower station surge chamber side wall concrete lining slip form system based on electroosmosis demolding and a construction method. The system comprises a diagonal bracing slip form construction platform, an electric field applying device, a hydraulic device, a supporting device and two sets of composite formwork devices; a closed area formed by the lined side wall concrete and the surrounding rock is used for pouring the side wall concrete; static electric field application is conducted on the side wall concrete entering the warehouse through the electric field application device, and after a lubricating water film is formed between the side wall concrete and the composite formwork device, hydraulic lifting is conducted on the opposite supporting type slip form construction platform and the borne composite formwork device and the electric field application device through the hydraulic device; the supporting device can bear the whole slip form lining construction load, and surge chamber side wall concrete lining construction based on electro-osmosis demolding is achieved. According to the invention, the adhesion friction force between the slip form template and the newly-poured concrete interface is effectively reduced, and the surface quality of the side wall concrete after demoulding is ensured.

Description

Technical Field

[0001] The invention relates to a construction system, in particular to a concrete lining slipform system for a side wall of a surge chamber of a hydropower station based on electroosmosis demoulding and a construction method. Background Art

[0002] In the construction of concrete lining of the side wall of the surge chamber of a large hydropower station, the slipform construction technology has been widely used due to its fast construction speed, high efficiency and continuous sliding and forming. However, in the construction of the side wall concrete lining, the adhesion between the concrete and the slipform formwork is too large, which has always been a key problem in the application of slipform technology. During the sliding process, the friction adhesion between the formwork and the newly poured concrete interface is too large, causing a series of problems in the lining construction, including substandard surface quality, gradual aggravation of formwork contamination, increased jacking energy consumption, and instability of the support system.

[0003] The template surface treatment technologies currently commonly used in engineering projects, such as applying release agents and vegetable oils, also face some problems, including difficulty in process control, potential hazards to the environment and human health, and insufficient durability. Summary of the invention

[0004] The purpose of the present invention is to provide a hydropower station surge chamber side wall concrete lining slipform system and construction method based on electroosmotic demoulding, which effectively reduces the adhesion friction between the slipform template and the newly poured concrete interface and ensures the surface quality of the side wall concrete after demoulding.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A hydropower station surge chamber side wall concrete lining slipform system based on electroosmosis demoulding comprises a double-braced slipform construction platform arranged between surrounding rocks on both sides and lined side wall concrete, an electric field applying device, a hydraulic device, a supporting device and a composite formwork device are arranged on the double-braced slipform construction platform, and two groups of composite formwork devices are arranged, which are respectively fitted with the lined side wall concrete on each side, and the composite formwork device, the lined side wall concrete and the surrounding rock form a closed area for pouring the side wall concrete; a static electric field is applied to the side wall concrete entering the warehouse by the electric field applying device, and after a lubricating water film is formed between the side wall concrete and the composite formwork device, the double-braced slipform construction platform and the composite formwork device and the electric field applying device carried by the hydraulic device are hydraulically lifted, and the supporting device will bear the entire slipform lining construction load, so as to realize the surge chamber side wall concrete lining construction based on electroosmosis demoulding.

[0007] Furthermore, the composite formwork device includes an internal conductive formwork and an external insulating protective formwork bonded by a non-conductive adhesive. The internal conductive formwork is made of a composite steel formwork material and the bottom end is welded to a support-type sliding formwork construction platform. The external insulating protective formwork is made of rubber material, and the height of the external insulating protective formwork is higher than that of the internal conductive formwork.

[0008] Furthermore, the electric field application device includes a running light transformer installed on the double-braced slipform construction platform, the output end of the running light transformer is connected to a negative transformer line and a positive transformer line, the negative transformer line is connected to the built-in conductive formwork on both sides of the double-braced slipform construction platform, and a number of side wall concrete lining steel bars are pre-embedded on both sides of the side walls of the voltage regulating room, and each side wall concrete lining steel bar is connected to the positive transformer line through a steel bar power line.

[0009] Furthermore, the supporting device includes a plurality of lifting frames with an F-shaped structure, the bottom of the lifting frames is welded to the double-braced slipform construction platform, and the horizontal panels of the lifting frames are penetrated by supporting climbing rods with fixed bottom ends.

[0010] Furthermore, the bottom end of the supporting climbing rod is welded to the concrete lining bottom plate of the side wall, and the upper end of the supporting climbing rod passes through the horizontal panel of the lifting frame, bears the load of the entire slipform system, and remains in the side wall concrete as a part of the vertical reinforcement.

[0011] Furthermore, the hydraulic device includes a plurality of hydraulic jacks and a hydraulic control console installed on the double-braced slipform construction platform. Each hydraulic jack is connected to the pre-buried supporting climbing rod through its own through hole, and the base of the hydraulic jack is installed on the lifting frame through high-strength bolts. The hydraulic control console is connected to one end of the left hydraulic oil pipeline and the right hydraulic oil pipeline through a straight pipe joint, and the other end of the left hydraulic oil pipeline and the right hydraulic oil pipeline is connected to the hydraulic jack through a multi-way joint.

[0012] Furthermore, a construction platform guardrail is arranged on the periphery of the double-braced slipform construction platform.

[0013] A construction method of a concrete lining slipform system for a side wall of a surge chamber of a hydropower station based on electroosmotic demoulding comprises the following steps:

[0014] Step 1: After the concrete lining construction of the surge chamber bottom plate is completed, firstly process the foundation surface of the side wall concrete lining bottom plate, and then carry out the pre-embedded binding of the side wall concrete lining steel bars; according to the design requirements, weld the bottom end of the supporting climbing rod to the side wall concrete lining bottom plate, and pre-embed it when the bottom plate is cast, so that it can be cast and fixed together with the bottom plate;

[0015] Step 2: Assemble the formwork of the double-braced slipform construction platform and transfer it to the slipform construction operation. According to the preset plan, establish connections between the electric field application device, the hydraulic device, the support device and the composite formwork device and the double-braced slipform construction platform and complete the inspection work;

[0016] Step 3: Start pouring the side wall concrete into the warehouse. During the pouring process, use layered pouring and layered vibration. When pouring to 2 / 3 of the built-in conductive formwork, stop pouring the side wall concrete into the warehouse, turn on the power supply of the running light transformer, apply an electric field to the side wall concrete poured into the warehouse, and when a lubricating water film appears on the contact interface between the built-in conductive formwork and the side wall concrete, prepare to start sliding on the double-supported sliding formwork construction platform;

[0017] Step 4: Start the hydraulic control console, and the hydraulic oil enters the hydraulic jacks on both sides of the support type sliding formwork construction platform through the left hydraulic oil pipeline and the right hydraulic oil pipeline to ensure that the support type sliding formwork construction platform maintains the same horizontal sliding height of 30cm;

[0018] Step 5: When the side wall concrete is poured to the designed elevation, slide the slipform system out and reinforce the supporting climbing rods. Then gradually cut off the supporting climbing rods in symmetrical positions. Finally, hoist the slipform system to the bottom plate of the surge chamber and remove the connections of the components.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention realizes the slipform construction of the concrete lining of the side wall of the surge chamber of a hydropower station based on electro-osmosis demoulding through a composite formwork device, a support-type slipform construction platform, an electric field applying device, a hydraulic device and a supporting device. During the construction process, an electric field is applied to the side wall concrete entering the warehouse, and a thin layer of water film with lubricating function is formed between the side wall concrete and the built-in conductive formwork under the action of the external electric field. After the lubricating water film is formed between the side wall concrete and the composite formwork device, the support-type slipform construction platform is vertically hydraulically lifted by the hydraulic device. Compared with the prior art, the device and the construction method can effectively reduce the adhesion friction between the interface of the slipform formwork and the newly poured concrete and the jacking force of the hydraulic device when the slipform formwork slides up, and ensures the surface quality of the side wall concrete after demoulding, thereby realizing the slipform construction of the concrete lining of the side wall of the surge chamber of a hydropower station based on electro-osmosis demoulding technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the positional relationship among the template device, the lifting device, the electric field applying device and the lifting device of the present invention.

[0023] In the figure: 1- built-in conductive formwork; 2- external insulating protection formwork; 3- side wall concrete lining steel bars; 4- steel bar power connection; 5- supporting climbing pole; 6- hydraulic control console; 7- left hydraulic oil pipeline; 8- right hydraulic oil pipeline; 9- double-braced slipform construction platform; 10- side wall concrete; 11- lifting frame; 12- hydraulic jack; 13- construction platform guardrail; 14- side wall concrete lined; 15- negative transformer connection; 16- running light transformer; 17- positive transformer connection; 18- surrounding rock. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 , 2 As shown, a hydropower station surge chamber side wall concrete lining slipform system based on electroosmotic demoulding described in this embodiment includes a support type slipform construction platform 9 arranged between the surrounding rocks 18 on both sides and the lined side wall concrete 14. An electric field applying device, a hydraulic device, a supporting device and a composite formwork device are arranged on the support type slipform construction platform 9, and two groups of composite formwork devices are arranged, which are respectively fitted with the lined side wall concrete 14 on each side. The composite formwork device, the lined side wall concrete 14 and the surrounding rocks 18 form a closed area for pouring the side wall concrete 10. A static electric field is applied to the side wall concrete 10 entering the warehouse by the electric field applying device. After a lubricating water film is formed between the side wall concrete 10 and the composite formwork device, the support type slipform construction platform 9 and the composite formwork device and the electric field applying device carried by it are hydraulically lifted by the hydraulic device. The supporting device will bear the entire slipform lining construction load, thereby realizing the surge chamber side wall concrete lining construction based on electroosmotic demoulding.

[0026] A construction platform guardrail 13 is also provided on the periphery of the double-braced slipform construction platform 9 to ensure the safety of the construction workers.

[0027] The composite formwork device includes an internal conductive formwork 1 and an external insulating protective formwork 2 bonded by a non-conductive adhesive. The internal conductive formwork 1 is made of a composite steel formwork material and the bottom end is welded to a support-type sliding formwork construction platform 9. The external insulating protective formwork 2 is made of rubber material, and the height of the external insulating protective formwork 2 is higher than that of the internal conductive formwork 1.

[0028] The electric field application device includes a running light transformer 16 installed on the double-braced slipform construction platform 9. The output end of the running light transformer 16 is connected to the negative transformer connection line 15 and the positive transformer connection line 17. The negative transformer connection line 15 is connected to the built-in conductive template 1 on both sides of the double-braced slipform construction platform 9. A number of side wall concrete lining steel bars 3 are pre-embedded on both sides of the side walls of the voltage regulating room. Each side wall concrete lining steel bar 3 is connected to the positive transformer connection line 17 through a steel bar power connection line 4.

[0029] The supporting device includes several lifting frames 11. The structure of the lifting frames 11 is an F-shaped frame, which is welded with 16# channel steel as columns, δ20mm steel plates as panels, and δ10mm steel plates as ribs. The bottom of the lifting frame 11 is welded on the support type slipform construction platform 9. The horizontal panels of the lifting frame 11 are penetrated by supporting climbing rods 5. The supporting climbing rods 5 are selected from 48×3.5mm welded pipes. The bottom ends are welded to the concrete lining bottom plate of the side wall, and the upper ends pass through the horizontal panels of the lifting frame 11 to bear the load of the entire slipform system and remain in the side wall concrete 10 as part of the vertical reinforcement.

[0030] The hydraulic device includes a plurality of hydraulic jacks 12 and a hydraulic control console 6 installed on the support type slipform construction platform 9. Each hydraulic jack 12 is connected to the pre-buried support climbing rod 5 through its core hole, and the base of the hydraulic jack 12 is installed on the lifting frame 11 through high-strength bolts; the hydraulic jack 12 uses HY-100 type jacks, with a designed load capacity of 10t, a calculated load capacity of 5t, and a climbing stroke of 30mm. The hydraulic control console 6 is connected to one end of the left hydraulic oil pipeline 7 and the right hydraulic oil pipeline 8 through a straight pipe joint, and the other end of the left hydraulic oil pipeline 7 and the right hydraulic oil pipeline 8 is connected to the hydraulic jack 12 through a multi-way joint. The hydraulic control console 6 is a ZYXT-36 type automatic leveling hydraulic control console, and the diameter of the left hydraulic oil pipeline 7 and the right hydraulic oil pipeline 8 is φ16mm. The hydraulic jacks 12 are connected to the hydraulic control console 6 in groups to form a hydraulic system.

[0031] A construction method of a concrete lining slipform system for a side wall of a surge chamber of a hydropower station based on electroosmotic demoulding comprises the following steps:

[0032] Step 1: After the concrete lining construction of the surge chamber bottom plate is completed, firstly process the foundation surface of the side wall concrete lining bottom plate, and then pre-embed and tie the side wall concrete lining steel bars 3; according to the design requirements, weld the bottom end of the supporting climbing rod 5 to the side wall concrete lining bottom plate, and pre-embed it when the bottom plate is cast, so that it is cast and fixed together with the bottom plate;

[0033] Step 2: Assemble the formwork of the double-braced sliding formwork construction platform 9 and transfer it to the sliding formwork construction operation. According to the preset plan, connect the electric field application device, hydraulic device, support device and composite formwork device with the double-braced sliding formwork construction platform 9 and complete the inspection work;

[0034] Step 3: Start pouring the side wall concrete 10 into the warehouse. During the pouring process, use layered pouring and layered vibration. When the side wall concrete 10 is poured to 2 / 3 of the built-in conductive template 1, stop pouring the side wall concrete 10 into the warehouse, turn on the power supply of the running light transformer 16, apply an electric field to the side wall concrete 10 poured into the warehouse, and when a lubricating water film appears on the contact interface between the built-in conductive template 1 and the side wall concrete 10, prepare to start sliding the support type sliding formwork construction platform 9;

[0035] Step 4: Start the hydraulic control console 6, and the hydraulic oil enters the hydraulic jacks 12 on both sides of the support type sliding form construction platform 9 through the left hydraulic oil pipeline 7 and the right hydraulic oil pipeline 8, ensuring that the support type sliding form construction platform 9 maintains the same horizontal degree and slides up, and the sliding height is 30cm;

[0036] Step 5: When the side wall concrete 10 is poured to the designed elevation, slide the slipform system out and reinforce the supporting climbing rods 5, then gradually cut off the supporting climbing rods 5 at symmetrical positions, and finally hang the slipform system to the bottom plate of the surge chamber and remove the components and connections.

Claims

1. A concrete lining slipform system for the side wall of a surge chamber of a hydropower station based on electroosmotic demoulding, characterized in that: The invention comprises a support type sliding form construction platform (9) arranged between surrounding rocks (18) on both sides and the lined side wall concrete (14); an electric field applying device, a hydraulic device, a supporting device and a composite formwork device are arranged on the support type sliding form construction platform (9); two groups of composite formwork devices are arranged, respectively fitting with the lined side wall concrete (14) on each side; the composite formwork device, the lined side wall concrete (14) and the surrounding rocks (18) form a closed area for pouring the side wall concrete (10); A static electric field is applied to the side wall concrete (10) entering the warehouse by means of an electric field applying device. After a lubricating water film is formed between the side wall concrete (10) and the composite formwork device, the support type slipform construction platform (9) and the composite formwork device and the electric field applying device carried thereon are hydraulically lifted by means of a hydraulic device. The support device will bear the entire slipform lining construction load, thereby realizing the surge chamber side wall concrete lining construction based on electroosmosis demoulding.

2. According to claim 1, a hydropower station surge chamber side wall concrete lining slipform system based on electroosmotic demoulding is characterized in that: The composite template device comprises an internal conductive template (1) and an external insulating protective template (2) bonded by a non-conductive adhesive, wherein the internal conductive template (1) is made of a composite steel template material and the bottom end is welded to a support-type sliding template construction platform (9), and the external insulating protective template (2) is made of a rubber material, and the height of the external insulating protective template (2) is higher than that of the internal conductive template (1).

3. A hydropower station surge chamber side wall concrete lining slipform system based on electroosmotic demoulding according to claim 2, characterized in that: The electric field applying device comprises a running light transformer (16) installed on the support type sliding formwork construction platform (9), the output end of the running light transformer (16) is connected to a negative transformer connection line (15) and a positive transformer connection line (17), the negative transformer connection line (15) is connected to the built-in conductive templates (1) on both sides of the support type sliding formwork construction platform (9), and a plurality of side wall concrete lining steel bars (3) are pre-buried on both sides of the side wall of the voltage regulating room, and each side wall concrete lining steel bar (3) is connected to the positive transformer connection line (17) through a steel bar power connection line (4).

4. According to the electroosmotic demoulding based concrete lining slipform system for the side wall of the surge chamber of a hydropower station, the system is characterized in that: The support device comprises a plurality of lifting frames (11) of an F-shaped structure, the bottom of the lifting frames (11) being welded to the double-braced slipform construction platform (9), and the horizontal panels of the lifting frames (11) are all penetrated by supporting climbing rods (5) with their bottom ends fixed.

5. A hydropower station surge chamber side wall concrete lining slipform system based on electroosmotic demoulding according to claim 4, characterized in that: The bottom end of the support climbing rod (5) is welded to the concrete lining bottom plate of the side wall, and the upper end of the support climbing rod (5) passes through the horizontal panel of the lifting frame (11), bears the load of the entire slipform system, and remains in the side wall concrete (10) as a part of the vertical reinforcement.

6. A hydropower station surge chamber side wall concrete lining slipform system based on electroosmotic demoulding according to claim 4, characterized in that: The hydraulic device comprises a plurality of hydraulic jacks (12) and a hydraulic control console (6) installed on a support type slipform construction platform (9). Each hydraulic jack (12) is connected to a pre-buried support climbing rod (5) through its central hole, and the base of the hydraulic jack (12) is installed on a lifting frame (11) through high-strength bolts. The hydraulic control console (6) is connected to one end of a left hydraulic oil pipeline (7) and a right hydraulic oil pipeline (8) through a straight pipe joint, and the other ends of the left hydraulic oil pipeline (7) and the right hydraulic oil pipeline (8) are connected to the hydraulic jack (12) through a multi-way joint.

7. A hydropower station surge chamber side wall concrete lining slipform system based on electroosmotic demoulding according to any one of claims 1 to 6, characterized in that: A construction platform guardrail (13) is arranged outside the double-braced slipform construction platform (9).

8. A construction method of a slipform system for concrete lining of a side wall of a surge chamber of a hydropower station based on electroosmotic demoulding as claimed in claim 7, characterized in that: The following steps are involved: Step 1: After the concrete lining construction of the surge chamber bottom plate is completed, firstly process the foundation surface of the side wall concrete lining bottom plate, and then pre-embed and tie the side wall concrete lining steel bars (3); according to the design requirements, weld the bottom end of the supporting climbing rod (5) to the side wall concrete lining bottom plate, and pre-embed it when the bottom plate is cast, so that it is cast and fixed together with the bottom plate; Step 2: Assemble the formwork of the double-braced sliding formwork construction platform (9) and transfer it to the sliding formwork construction operation, establish connections between the electric field application device, the hydraulic device, the supporting device and the composite formwork device and the double-braced sliding formwork construction platform (9) according to the preset plan, and complete the inspection work; Step 3: Start pouring the side wall concrete (10) into the warehouse. During the pouring process, pour and vibrate in layers. When the side wall concrete (10) is poured to 2 / 3 of the built-in conductive template (1), stop pouring the side wall concrete (10) into the warehouse, turn on the power supply of the running light transformer (16), apply an electric field to the side wall concrete (10) poured into the warehouse, and when a lubricating water film oozes out at the contact interface between the built-in conductive template (1) and the side wall concrete (10), prepare to start sliding the double-supported sliding formwork construction platform (9); Step 4: Start the hydraulic control console (6), and the hydraulic oil enters the hydraulic jacks (12) on both sides of the support type sliding formwork construction platform (9) through the left hydraulic oil pipeline (7) and the right hydraulic oil pipeline (8), ensuring that the support type sliding formwork construction platform (9) maintains the same horizontal degree and slides up, and the sliding height is 30 cm; Step 5: When the side wall concrete (10) is poured to the designed elevation, the slipform system is emptied and the supporting climbing rods (5) are reinforced, and then the supporting climbing rods (5) at symmetrical positions are gradually cut off. Finally, the slipform system is hoisted to the bottom plate of the surge chamber and the components are dismantled and connected.

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