A slip form system for concrete pouring of a gallery structure on a high and steep slope

Abstract

The present invention discloses a slip form system for concrete pouring of a high and steep slope slab corridor structure. The slip form system is used for concrete pouring of a corridor and a cover slab, and is composed of an integral slip form for the corridor that can be synchronously lifted, a slip form for the core wall cover slab, and a hydraulic control system; the slip form for the corridor and the cover slab is provided with a form body, a traction system, a hydraulic control system, etc. The slip form for the corridor drives the form body to lift through a through-type jack, and the side top arch and the bottom slab are cast integrally. The slip form for the cover slab relies on the reverse wheel pressure and the formwork support to jointly balance the concrete buoyancy force, and drives the form body to lift synchronously with the slip form for the corridor through a hydraulic jack, and finally completes the concrete pouring construction of the high slope slab corridor structure safely and efficiently. The system of the present invention can realize synchronous or separate automatic climbing, and each casting body is cast integrally, successfully solving the problems of high safety risk, slow construction progress, low quality, high cost, and the need for large lifting equipment under the construction conditions of a high slope with a variable grade and no access road for the concrete of the slab corridor structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of the design of construction equipment for water conservancy and hydropower projects, and particularly belongs to the technical field of the design of concrete pouring equipment for water conservancy and hydropower projects. In particular, it relates to a slip form system for concrete pouring of a gallery structure on a high and steep slope. Background Technique

[0002] At present, in the concrete pouring construction of high and steep slopes of hydropower stations, the conventional method is to use ordinary slip forms or fabricated and installed forms for construction. When using an ordinary trackless slip form, a winch needs to be installed at the top of the slope to provide the upward power for the slip form. It is difficult to install the winch on a high and steep slope, and the buoyancy is not easy to control, making it difficult to achieve in on-site construction; while when using the conventional fabricated and installed form, the demolition workload is large, requiring a large amount of manpower and material resources, with high labor intensity of personnel and low construction efficiency, seriously affecting the construction rhythm and safety.

[0003] Chinese Application No. 201410756761.X discloses an inverted-rail hydraulic climbing form for concrete pouring on a high and steep slope. It uses a form, a traveling device and a track for slip form construction, wherein: the traveling device is composed of traveling wheels, a main shaft, a sub-shaft, a reverse wheel, traveling clamping teeth, a hydraulic climbing oil cylinder and a traveling support. This application realizes the automatic lifting of the form on the slope by the traction of the hydraulic system, balances the buoyancy of the concrete by the reverse wheel pressure, realizes the lifting and positioning of the hydraulic oil cylinder by a special track, and realizes the fixation of the climbing form by the self-locking of the clamping teeth, avoiding the problems of insufficient buoyancy and difficult upward movement of the concrete on the high and steep slope.

[0004] For the combined concrete pouring of the gallery pouring and the core wall cover slab pouring, there is currently no gallery integral slip form and core wall cover slab slip form combined system that can realize its matching construction operation. Summary of the Invention

[0005] The present invention discloses a slip form system for concrete pouring of a gallery structure on a high and steep slope according to the deficiencies of the prior art. The purpose of the present invention is to provide a slip form for simultaneous pouring of concrete of the gallery structure, realizing the synchronous lifting of the concrete forms of the gallery structure, and solving the problems of high safety risks, low construction efficiency, low quality, high cost and the need for large-scale lifting equipment in the construction of the concrete on the slope of the project to be relied on.

[0006] The present invention is realized through the following technical solutions:

[0007] A slip form system for concrete pouring of a gallery structure on a high and steep slope, the slip form system is used for concrete pouring with a gallery and a cover slab, and is characterized in that: the slip form system is composed of an integral gallery slip form, a core wall cover slab slip form and a hydraulic control system that can be synchronously lifted, wherein:

[0008] The integral slip form for the corridor includes a form body, a traveling device, and a traction system. The form body includes a top arch form for the corridor, side forms for the corridor, and a bottom form for the corridor. The traveling device includes a needle beam and its moving mechanism. The periphery of the cross-section of the needle beam is supported and connected to each form of the form body through adjustable telescopic supports. The moving mechanism moves through a track system arranged on the bedrock surface of the corridor. The traction system is arranged at the front of the needle beam and is a hydraulic drive structure and is fixed to the front end of the corridor through steel strands.

[0009] The slip form for the core wall cover plate includes a cover form template, a cover form traveling device, and a cover form drive system. The cover form template is a planar slip form template and is supported by a cover form support and arranged along the slope to pour the cover plate. Two groups of parallel cover form traveling devices are arranged at both ends of the cover form support and are driven in parallel by the cover form drive system. The front end is fixed to the slope end through a chain block. The cover form drive system is a hydraulic drive structure.

[0010] The hydraulic control system is used to synchronously control and drive each hydraulic drive structure.

[0011] The track system described in the present invention includes dowel bars inserted into the bedrock surface arranged at the lowermost part of the form body. Embedded track supports are arranged above the dowel bars. The track supports are welded to the dowel bars. A steel rail is connected to the upper part of the track support through a connecting bolt.

[0012] The moving mechanism includes front rollers, front roller supports arranged at the front end of the needle beam, rear rollers, and rear roller supports arranged at the rear end of the needle beam. The front rollers are connected to the needle beam through the front roller supports, and the rear rollers are connected to the needle beam through the rear roller supports. Each roller moves on the steel rail to realize the movement of the integral slip form for the corridor under drive.

[0013] The needle beam is a steel frame beam with a rectangular cross-section. The outer periphery of the steel frame beam is supported and connected to the top arch form for the corridor, side forms for the corridor, and the bottom form for the corridor through adjustable supports. A corridor operation platform, a corridor form platform, a corridor plastering platform, and a corridor rear lifting platform are arranged longitudinally on the needle beam from top to bottom.

[0014] The traction system includes a jack support, a steel strand jack, and a steel strand. The steel strand jack is connected to the needle beam through the jack support. The steel strand passes through the steel strand jack and is fixed to the front end of the corridor.

[0015] The cover form support described in the present invention is a steel structure beam with a truss beam structure. The cover form template is fixedly arranged on the bottom surface of the cover form support. A cover form pouring platform is arranged at the front end of the steel structure beam with a truss beam structure, and a cover form plastering platform is arranged at the rear end.

[0016] The formwork walking device includes a formwork track system and a formwork moving system arranged on both side slopes; the formwork track system includes: formwork dowels anchored and inserted into the bedrock surface of the side slopes, with embedded anchor bolts welded to the upper part of the formwork dowels, climbing cones arranged on the upper part of the embedded anchor bolts, anchor bolt turnover joints arranged on the upper part of the climbing cones, formwork tracks arranged on the upper part of the anchor bolt turnover joints, and embedded formwork track supports arranged under the laying line of the formwork tracks for supporting the tracks; the formwork moving system includes: multiple groups of formwork rollers arranged at both ends of the formwork support beam, and the formwork rollers are limited and move in the formwork tracks with a groove structure.

[0017] An elastic plate for positioning the formwork template and fixed to the end face of the formwork template through a spring is arranged at the end face of the two-end formwork template and below the formwork rollers; formwork guide wheels are arranged at the front ends of multiple groups of formwork rollers at both ends.

[0018] The formwork driving system includes two sets of upper and lower reversing boxes and a climbing hydraulic jack drivingly connected therebetween. Each reversing box is provided with a buckle detachably fixed to the wing plate buckle of the formwork track; the front end of the upper reversing box is pin-connected and drivingly connected to the formwork support, the rear end is connected to the climbing hydraulic jack, the lower reversing box is connected to the other end of the climbing hydraulic jack, and each reversing box is provided with a reversing handle to adjust the moving direction of the one-way stop mechanism and is detachably clamped with the stop bump on the formwork track.

[0019] The hydraulic control system of the present invention is arranged on the gallery operation platform and includes a hydraulic control console and is control-connected to each hydraulic driving structure.

[0020] In the gallery and cover slab slip form of the slab gallery structure of the present invention, the tracks are fixed by dowels and track supports. The gallery slip form is pulled by a strand jack to automatically climb upward as a whole, and the floating force of the bottom slab concrete is balanced by a 5t manual chain hoist in combination with the track. The gallery slip form as a whole is fixed and adjusted by using a needle beam, an outer frame of the needle beam and adjustable supports, so that the crown arch, side walls, bottom slab and drainage ditch of the gallery are cast in one go. The cover slab slip form is pushed by a hydraulic jack to automatically climb on the side slope. The floating force of the concrete is balanced by the reverse rollers and the formwork support together. The stopping and anti-falling of the formwork body are jointly completed by the upper and lower reversing boxes, the one-way stop mechanism and the stop bumps. At the same time, a 5T chain hoist assists in positioning and anti-falling of the slip form, and together with the reversing box, it plays a double-insurance role. During the concrete pouring process of the whole structure, it synchronously slides upward through its respective climbing devices to achieve the purpose of completing the pouring of the slab gallery structure concrete.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The corridor slip form can achieve the automatic upward climbing of the integral corridor slip form by means of the strand jack, and the 5t manual chain hoist is combined with the track to balance the buoyancy of the bottom slab concrete. The integral corridor slip form is fixed and adjusted by using the needle beam, the outer frame of the needle beam and the adjustable support, so as to achieve the one-time casting of the top arch, side wall, bottom slab and drainage ditch of the corridor.

[0023] The slope cover plate slip form can achieve the automatic climbing of the formwork body on the slope by means of the hydraulic jack. The reverse rollers and the cover formwork support are relied on to jointly balance the concrete buoyancy. The positioning and safety anti-falling of the cover plate slip form are realized by relying on the upper and lower reversing boxes, the one-way stop mechanism, the stop convex block and the set 5t manual chain hoist.

[0024] The present invention has successfully solved the problems of high safety risk, slow construction progress, low quality, high cost and the need for large lifting equipment under the construction conditions of high slopes with variable grades and no access roads for the concrete of the slab corridor structure, avoided the insufficient anti-buoyancy force during the pouring of the corridor and cover plate concrete on high and steep slopes, and improved the mechanization and automation degree of the construction at the same time.

[0025] Compared with the existing slip forms, the integral corridor slip form does not need to install lifting equipment, only needs to install the anchor points of the through jack at appropriate positions at the top, relies on the through jack to automatically climb upward, and can also achieve the one-time casting of the top arch, side wall, bottom slab and drainage ditch of the corridor, without the need for staged pouring, saving a large amount of construction period and cost. The cover plate slip form is pushed by the hydraulic jack to climb automatically, resists the concrete buoyancy by relying on the track and the formwork support together, and uses the reversing box and the chain hoist for double insurance for positioning and safety anti-falling. In addition, the corridor slip form and the cover plate slip form form an integral slip form for the concrete of the slab corridor structure to slide synchronously. The cover plate slip form serves as the cover form of this structure, and the corridor slip form serves as the bottom form of this structure, and the two together form the formwork system of this structure. Description of the Drawings

[0026] Figure 1 It is a longitudinal sectional view of the slip form of the slab corridor structure of the present invention;

[0027] Figure 2 It is a cross-sectional view of the slip form of the slab corridor structure of the present invention;

[0028] Figure 3 It is a plan view of the cover plate slip form of the present invention;

[0029] Figure 4 It is a partial schematic view of the sliding structure of the cover plate slip form of the present invention;

[0030] Figure 5 It is an enlarged cross-sectional view of the corridor slip form of the present invention;

[0031] Figure 6 It is a schematic view of the driving structure of the reversing box of the present invention. Detailed Embodiments

[0032] The present invention will be further described below in conjunction with specific embodiments. The specific embodiments are further explanations of the principles of the present invention and do not limit the present invention in any way. Technologies identical or similar to the present invention do not exceed the scope of protection of the present invention.

[0033] In conjunction with the accompanying drawings.

[0034] As shown in the figure, the slab gallery structure slip form system of the present invention includes two parts: the overall gallery slip form and the core wall cover plate slip form. When pouring the concrete of the gallery and the cover plate, the slab gallery structure slip form is lifted synchronously.

[0035] The overall gallery slip form of the present invention includes a form body, a traction system, a hydraulic control system, etc. At the bottom of the form body, there is a reinforcing bar 1 inserted into the bedrock surface. On the upper part of the reinforcing bar 1, there is a pre-embedded track support 2. The track support is welded to the reinforcing bar 1. On the upper part of the track support 2, a P24 steel rail 4 is connected by a connecting bolt 3. A traveling device is arranged on the P24 steel rail 4, and the traveling device loads the overall gallery slip form.

[0036] The traveling device includes a front roller 5, a front roller support 6, a rear roller 15, a rear roller support 16, a needle beam 10, and a needle beam outer frame 20. The front roller 5 is connected to the needle beam 10 through the front roller support 6, and the rear roller 15 is connected to the needle beam 10 through the rear roller support 16. On the outside of the needle beam 10, the top arch formwork 12, the side formwork 13, and the bottom formwork 14 of the gallery are fixed by adjustable supports 11. From top to bottom, the needle beam 10 is provided with an upper gallery operation platform 21, a gallery formwork platform 19, a gallery plastering platform 18, and a gallery rear hanging platform 17.

[0037] The traction system includes a jack support 9, a strand jack 7, and a steel strand 8. The strand jack 7 is connected to the needle beam 10 through the jack support 9, and the steel strand 8 passes through the strand jack 7.

[0038] The hydraulic control system mainly includes a hydraulic control console 22, and the hydraulic control console 22 is arranged on the gallery operation platform 21.

[0039] The core wall cover plate slip form of the present invention mainly consists of a cover form template 109, a cover form support 110, a cover form plastering platform 116 and a cover form plastering platform angle adjusting rod 111, a cover form track 106, a pre-embedded anchor bolt 102, an anchor bolt turnover joint 105, a reversing box 107, a hydraulic jack 117, a cover form hydraulic control station 112, an outer patch plate 104, an elastic plate 114, a climbing cone 103, a cover form roller 108, a cover form guide wheel 120, a wireless remote control device for the hydraulic station, a 5T chain block 121, and a platform gangplank.

[0040] The bottom of the cover formwork reinforcing bar 101 is inserted into the bedrock surface. An embedded anchor rod 102 is arranged on the upper part of the cover formwork reinforcing bar 101. A climbing cone 103 is arranged on the upper part of the embedded anchor rod 102. An anchor rod turnover joint 105 is arranged on the upper part of the climbing cone 103. A cover formwork track 106 is arranged on the upper part of the anchor rod turnover joint 105. An embedded cover formwork track support 113 is arranged under the cover formwork track 106 to support the track. A cover formwork template 109 is arranged on the cover formwork track 106. A cover formwork support 110 is arranged on the cover formwork template 109.

[0041] The center wall cover formwork sliding form is provided with a reversing box 107, a climbing hydraulic jack 117, a cover formwork template 109, a cover formwork support 110, a cover formwork roller 108, a cover formwork guide wheel 120, a 5t manual chain hoist 121, and a chain hoist pull ring 122 from bottom to top. In addition, a cover formwork pouring platform 119 and a cover formwork plastering platform 116 are arranged on the formwork body. A cover formwork hydraulic control console 112 and a plastering platform guardrail 118 are arranged on the cover formwork plastering platform 116, and are connected to the cover formwork support 110 through a plastering platform adjusting rod 111. An outer repair plate 104 is arranged on the outside of the template, and an elastic plate 114 and a spring 115 are arranged on the inside.

[0042] As Figure 1 、 Figure 2 、 Figure 5 shown, the integral sliding form of the corridor includes a formwork body, a traction system, a hydraulic control system, etc. The bottom of the formwork body is provided with a reinforcing bar 1 inserted into the bedrock surface. An embedded track support 2 is arranged on the upper part of the reinforcing bar 1, and its main function is to support the upper track 4. The track support 2 is welded to the reinforcing bar 1. The upper part of the track support 2 is connected with a P24 steel rail track 4 through a connecting bolt 3. A traveling device is arranged on the P24 steel rail track 4, and the integral sliding form of the corridor is loaded on the traveling device.

[0043] The traveling device is composed of a front roller 5, a front roller support 6, a rear roller 15, a rear roller support 16, a needle beam 10, a needle beam outer frame 20, etc. The front roller 5 is connected to the needle beam 10 through the front roller support 6. The rear roller 15 is connected to the needle beam 10 through the rear roller support 16. The outside of the needle beam 10 fixes the corridor top arch formwork 12, the corridor side formwork 13, and the corridor bottom formwork 14 through an adjustable support 11. The needle beam 10 serves as the middle main beam and plays a supporting role for the whole system, and is provided with an upper operation platform 21, a formwork platform 19, a plastering platform 18, and a rear suspension platform 17 from top to bottom.

[0044] As Figure 1 、 Figure 2 、 Figure 5As shown in the figure, the traction system includes a jack support 9, a strand jack 7, and a strand 8. The strand jack 7 is connected to the needle beam 10 through the jack support 9, and the strand 8 passes through the strand jack 7. The hydraulic control system mainly includes a hydraulic control console 22, which is arranged on the upper operation platform 21. The hydraulic control console 22 is equipped with a hydraulic station to control the overall slip form climbing.

[0045] As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, the core wall cover slip form mainly consists of a cover form template 109, a cover form support 110, a cover form finishing platform 116, a cover form finishing platform angle adjusting rod 111, a cover form track 106, a pre-embedded anchor rod 102, an anchor rod turnover joint 105, a reversing box 107, a climbing hydraulic jack 117, a cover form hydraulic control station 112, an outer patch plate 104, an elastic plate 114, a climbing cone 103, a cover form roller 108, a cover form guide wheel 120, a wireless remote control device for the hydraulic station, a 5T chain block 121, and a platform gangplank, etc.

[0046] At the lowest part of the structure, there is a cover form reinforcement bar 101 inserted into the bedrock surface. The upper part of the cover form reinforcement bar 101 is provided with a pre-embedded anchor rod 102, which is welded to the cover form reinforcement bar 101. The upper part of the pre-embedded anchor rod 102 is provided with a climbing cone 103, and the upper part of the climbing cone 103 is provided with an anchor rod turnover joint 105. Both the climbing cone 103 and the anchor rod turnover joint 105 can be repeatedly turned over and used. The upper part of the anchor rod turnover joint 105 is provided with a cover form track 106. The lower part of the cover form track 106 is provided with a pre-embedded cover form track support 113 for supporting the track. The cover form track 106 is provided with a cover form template 109, and the cover form support 110 is arranged on the cover form template 109. The cover form support 110 and the cover form track 106 with a reverse pulley structure jointly balance the concrete buoyancy force. The cover form roller 108 mainly plays the role of supporting the formwork and reducing the sliding resistance.

[0047] As Figure 1 , Figure 3 , Figure 4 , Figure 6 shown, the cover form template 109 is provided with a reversing box 107, a climbing hydraulic jack 117 from bottom to top. The reversing box 107 is provided with a one-way stop mechanism. By changing the direction with the handle, the formwork system can be lifted or lowered. Each reversing box 107 has an automatic anti-falling function.

[0048] As Figure 6As shown in the figure, the front end of the upper reversing box 107 is pin-connected to the formwork support 110, and the rear end is connected to the climbing hydraulic jack 117. At the same time, its buckle catches the upper wing plate of the formwork track 106. The lower reversing box 107 is connected to the other end of the climbing hydraulic jack 117, and its buckle catches the upper wing plate of the formwork track 106. The reversing box 107 adjusts the direction of the one-way stop mechanism 201 through the reversing handle 202 to make it engage with the stop bump 203 on the track, completing the dual functions of stopping and anti-falling. At the same time, the 5T chain hoist 121 above assists in the positioning and anti-falling of the slip form, and together with the reversing box, it plays a dual-insurance role. The formwork template 109, formwork support 110, and formwork roller 108 mainly play the role of supporting the template and reducing the sliding resistance.

[0049] The formwork guide wheel 120 is mainly used to ensure that the template always walks correctly along the track; the 5t hand chain hoist 121 and the chain hoist pull ring 122 mainly play the role of safety anti-falling and positioning the height of the slip form; in addition, a formwork pouring platform 119 and a formwork finishing platform 116 are arranged on the formwork body. A hydraulic control station 112 and a formwork finishing platform guardrail 118 are arranged on the formwork finishing platform 116, and are connected to the formwork support 110 through the finishing platform adjusting rod 111. An outer repair plate 104 is arranged on the outside of the template, and the outer repair plate 104 is used for manual disassembly, assembly and turnover; an elastic plate 114 and a spring 115 are arranged inside the track, and the elastic plate 114 is always tightly attached to the inner edge of the track and slides up under the action of the spring 115.

[0050] The following takes a specific project construction to illustrate the present invention. A certain hydropower station is the world's highest gravel soil core wall rockfill dam under construction in China, with a maximum dam height of 315m. Except for a 4.5m-wide temporary construction access road at an elevation of 2280m on the left and right abutments, there are no access roads at other elevations. The slopes are high and steep and variable in grade. Compared with the slopes of other projects, the slope ratio is larger, and the maximum slope ratio is 1:0.58 (59.9°). The project has extremely high safety risks, no material transportation channels, tight construction periods, and high engineering quality requirements.

[0051] 1. Preparation work on the bedding surface

[0052] After the bedrock surface treatment is qualified, measurement and setting out are carried out, and the control points are marked at obvious positions, and the steel bar binding positions and formwork erection lines need to be determined; at the same time, the sundries, soil and loose rock blocks on the bedrock surface need to be cleaned up, and the geological data is collected and sorted out for joint acceptance by four parties.

[0053] 2. Installation of steel bars and embedded parts

[0054] The steel bars are uniformly processed in the steel bar factory according to the design drawings and cutting lists, and the models and numbers of the steel bars are clearly marked. They are transported to the construction site by 10t flatbed trucks, and then transported to the working face by machinery and manual labor for manual installation. The installation of steel bars shall be carried out according to the design drawings, and the binding and welding must meet the requirements of the design and specifications. The water stops and other embedded parts of this project are constructed strictly in accordance with the requirements of the design drawings. Before construction, detailed technical disclosures are made. After the installation of the embedded parts, they shall be fixed in reliable positions and firmly reinforced to ensure that they will not be deformed during pouring and vibration.

[0055] 3. Slip form installation

[0056] After all the equipment and materials are transported to the foundation pit, on-site assembly is carried out, and the installation construction is carried out with the cooperation of a 25t truck crane and a 130t crawler crane. The slip forms of the slab corridor structure are mainly divided into the cover plate slip form and the overall slip form of the corridor.

[0057] (1) Cover plate slip form installation

[0058] The installation procedure of the core wall cover plate slip form is as follows:

[0059] Component numbering, marking the assembly line → Driving in the dowel bars → Embedding the anchor bolts → Installing the climbing cones and the anchor bolt turnover joints → Installing the tracks → Template assembly → Installation of the template support → Hoisting the template to the installation surface → Installation of the elastic plate → Installation of the rollers and guide wheels → Template installation → Installation of the reversing box → Installation of the hydraulic jacks → Installation of the finishing platform and the adjusting rods → Installation of the concrete pouring platform → Installation of the hydraulic control station and the oil circuit → Installation of the circuit, wireless remote control device, water, communication, signal precision control and observation device → Installation of the chain hoist and the pull rings → Installation of other facilities.

[0060] (2) Corridor slip form installation

[0061] The installation procedure of the corridor slip form is as follows:

[0062] Driving in the dowel bars → Embedding the track supports → Installation of the P24 tracks → Assembly of the main girders in the formwork body → Installation of the front traveling rollers and the supports → Installation of the rear traveling rollers and the supports → Installation of the rear hanging platform → Installation of the needle beam → Installation of the pickets on each platform → Installation of each cross brace → Installation of the template platform → Reinforcement and assembly of the needle beam frame → Template assembly → Placement of the formwork body → Installation of the finishing platform and the upper operation platform → Installation of the steel strands → Installation of the steel strand jacks → Installation of the hydraulic control system and the oil circuit → Adjusting the formwork body → Installation of the water and electricity supporting facilities → Debugging the hydraulic and electrical systems → Testing the climbing of the corridor formwork → Accepting the formwork → The corridor slip form enters the formal construction stage.

[0063] 4. Concrete pouring

[0064] The slip form installation is completed. After the silo number is inspected and accepted, concrete pouring construction is carried out. The concrete uses each grouting adit on the bank slope as the transportation channel. The tank truck transports it to the platform at the entrance of the adit. The Ф250 PE pipe is used as the chute pipe, and a chute with an appropriate height is set at the lower part as the concrete feeding method for concrete pouring construction. The single section of the chute pipe is 3 m long and is connected by flange plates. A buffer hopper is set every 12 - 15 m in height to prevent the separation of aggregates.

[0065] The concrete feeding and pouring must ensure layering, flat start, symmetry and uniformity. The concrete paving time period and direction should be alternated. The thickness of each layer of the feeding concrete is kept at 30 cm, and the concrete of the same layer should be poured within the specified time as much as possible. The vibration of the concrete is carried out symmetrically in sections using 5 - 6 Ф50 soft - shaft inserted vibrators. When vibrating, it is strictly carried out in accordance with the concrete construction specifications. The vibrating rod shall not touch the bearing rod, steel bars, embedded parts and formwork. When the formwork is lifted, the vibration of the concrete must be stopped to avoid the deformation and collapse of the demoulded concrete. In addition, the following points should be noted during the pouring construction:

[0066] (1) The initial pouring of concrete and the initial lifting of the formwork should be carried out strictly according to the following steps: First, pour 10 cm high concrete or mortar of aggregates, and then pour three layers in 30 - cm - thick layers. When the height reaches about 90 cm, start a small cycle of lifting to check whether the setting of the demoulded concrete reaches the strength requirement; After the fourth layer (layer height 20 cm) is poured, lift 20 cm, carry out the pouring of the fifth layer (layer height 20 cm), and then lift 20 cm. If there is no abnormal situation, normal pouring and lifting can be carried out.

[0067] (2) Always remove the concrete adhered to the formwork, and also clean the concrete on the chute pipe, so as to avoid too much concrete accumulation, which will increase the load of the formwork body or affect the lifting.

[0068] (3) Prevent the concrete mortar from polluting the hydraulic system tools and tracks, and always remove the concrete slurry adhered to the tracks, so as to avoid too much concrete accumulation and affect the lifting..

[0069] 5. Slip form lifting

[0070] 5.1 Core wall cover slip form lifting

[0071] (1) Initial slip stage of the formwork

[0072] After the installation and debugging are completed, the concrete pouring can be carried out. Due to the technical requirements of slip form construction, the concrete pouring should be carried out continuously. First, pour a layer of concrete up to the middle of the slip form template, and use a Ф50 soft shaft inserted vibrator for vibration. When the concrete strength reaches about 0.2 Mpa (the concrete stripping strength should be controlled at 0.2 - 0.4 MPa), lift the slip form about 20 cm high, check the pouring quality, and carry out surface leveling treatment. Use instruments to observe whether the newly poured concrete surface sags. After all parameters meet the technical requirements, continue pouring and enter the normal lifting stage.

[0073] (2) Normal lifting stage

[0074] 1) During the normal lifting process, the time interval between two lifts should not exceed 1 hour (usually about 0.5 hour), and each lift is about 20 cm. When the steel bar length is not enough, continue to lengthen it.

[0075] 2) After the slip form rises 2 - 3 m, hang a surface leveling platform frame at the bottom of the slip form for surface leveling and curing, and hang a safety net outside the surface leveling platform frame. In summer, curing is generally carried out by sprinkling water, and it is cured about once every half hour. When it is hot, it is cured continuously.

[0076] 3) During the lifting process, the hydraulic jacks should be fully filled with oil and drained. During the lifting process, if the oil pressure increases to more than 1.2 times the normal lifting working pressure (100 Mpa) and still cannot lift all the jacks, stop the lifting operation immediately, check the reason in time, and deal with it promptly.

[0077] 4) During the normal lifting process, the operation platform should be kept basically horizontal. The relative elevation difference between the left and right ends of the slip form should not be greater than 40 mm.

[0078] 5) When the pouring height of the core wall cover plate rises to 1 / 2 of the design height, stop pouring. At this time, check the working status of various equipment, replace or repair damaged parts, observe the deformation of the slip form template and check the pouring quality. After passing the inspection, continue pouring.

[0079] 6) During the lifting process, the deviation values of the structural verticality, inclination slope, levelness and structural cross-sectional dimensions should be checked and recorded. If there are deviations, corrective actions should be taken immediately.

[0080] 7) During the lifting process, the working status of the operation platform structure and track and the setting state of the concrete should be checked at any time. If any abnormality is found, the reason should be analyzed in time and effective treatment measures should be taken.

[0081] 8) During the lifting process, the mortar adhered to the template should be cleaned in time, and the hardened dry ash should not be allowed to fall into the template and mix into the concrete.

[0082] 9) During the jacking-up process, there shall be no oil stains. Any steel bars and concrete contaminated by oil shall be cleaned up in a timely manner.

[0083] (3) Completion jacking-up stage of the formwork

[0084] When the formwork jacks up to about 1 m above the top elevation, the slip formwork enters the completion jacking-up stage. At this time, the jacking-up speed shall be slowed down, and accurate leveling and alignment work shall be carried out to enable the last layer of concrete to be evenly closed in a circle, ensuring the correctness of the top elevation and position.

[0085] 5.2 Jacking-up of the gallery slip formwork

[0086] For the gallery slip formwork, when the first concrete pouring is carried out, when the pouring time is close to the initial setting time of the concrete, the initial jacking-up of the formwork body is carried out, first jacking up about 2 - 3 cm to prevent the formwork body from being firmly adhered by the concrete. Until the formwork body is filled with concrete, it enters the normal jacking-up. The normal pouring makes the formwork body jack up about 5 cm each time, and the pouring speed must meet the requirements of the formwork body jacking-up speed.

[0087] For the load-bearing crown arch part, the jacking-up time is determined according to the strength tests of the concrete at different times. Since it is not easy to master the initial form removal time, on-site sampling tests must be carried out to determine it. The form removal strength is about 0.3 - 0.5 MPa. Generally, the average jacking-up speed of the formwork shall not be greater than 10 cm / h, following the principle of "more movement and less jacking-up": not less than 2 times per hour, and each jacking-up is about 50 mm. The removed formwork concrete must reach the initial setting strength, and it is best to finish plastering with the original mortar. The continuous climbing of the formwork for 12 m is a cycle. When climbing to the locking frame on the main beam in the formwork body, stop the concrete from entering the bin and prepare to lift the main beam in the formwork body.

[0088] The chute is used for bin entry. The bin entry sequence is generally the crown arch first, then the waist part, and finally the gallery floor slab. The concrete entering the bin shall be evenly spread, and the spread height difference shall be controlled within the range of ±15 cm to ensure that the formwork does not shift. The vibration of the concrete and the binding of the steel bars are both carried out on the gallery slip formwork platform.

[0089] During the jacking-up process, a person with slip formwork construction experience is assigned to observe and analyze the concrete surface to determine the appropriate jacking-up speed and jacking-up time. During the jacking-up process, the "rustling" sound can be heard, and the concrete removed from the formwork has no flowing and cracking phenomena; the concrete surface is wet and unchanged in shape, and it feels hard when pressed by hand. If the fingerprint is too deep, the jacking-up shall be stopped to avoid flowing phenomena; if it is too hard, the jacking-up speed shall be increased. After the jacking-up, use a trowel to level and smooth the defective form removal surface.

[0090] 6. Removal of the slip formwork

[0091] After the concrete of a strip or all is poured, the slip formwork is removed, specifically as follows:

[0092] (1) Removal of the cover plate slip formwork

[0093] 1) Remove the auxiliary equipment on the cover slab slip form, such as electrical control boxes, welding machines, lighting equipment, etc.

[0094] 2) Demolish the concrete pouring platform and finishing platform.

[0095] 3) Cut off the redundant steel bars at the top of the core wall cover slab.

[0096] 4) Remove the hydraulic equipment, oil circuits, electrical circuits, etc.

[0097] 5) Use lifting equipment to lift the formwork and remove the roller wheels and guide wheels.

[0098] 6) Remove the remaining parts and components of the slip form formwork and lift them to an open area on the dam crest.

[0099] 7) Remove the tracks section by section.

[0100] 8) Take out the climbing cones from the cover slab concrete surface.

[0101] 9) Use 107 glue to mix mortar to fill and block the conical pits left by taking out the climbing cones and level them.

[0102] (2) Demolition of the gallery slip form

[0103] When the formwork body of the foundation gallery slip form slides up to the top, carry out the demolition of the slip form. The specific construction process is as follows: Extend the track 2 - 6m above the top of the gallery. Install a 10t winch on the dam crest and configure a simple steel structure trolley to be responsible for transporting equipment and materials for demolishing the formwork body. Demolish each layer of platforms, formwork and other parts and components from bottom to top, that is, start from the rear lifting platform at the tail and layer by layer upwards. When the total mass of the foundation gallery slip form is less than 10t after demolition, use the 10t winch in the upper horizontal section to lock the foundation gallery slip form, then remove the original lifting system equipment and transport it to an open area on the dam crest. Finally, demolish all the remaining formwork bodies and transport them to an open area on the dam top.

Claims

1. A slip form system for concrete pouring of a high-steep slope slab corridor structure, the slip form system being used for concrete pouring with a corridor and a cover plate, and characterized in that: The slipform system consists of a synchronously sliding corridor slipform, a core wall cover slipform and a hydraulic control system, among which: The overall sliding form of the corridor includes a formwork, a walking device, and a traction system; the formwork includes a corridor top arch formwork, a corridor side formwork, and a corridor bottom formwork; the walking device includes a needle beam and its moving mechanism, the cross section of the needle beam is connected to the formwork supports of the formwork through adjustable telescopic supports, and the moving mechanism moves through a track system arranged on the bedrock surface of the corridor; the traction system is arranged at the front of the needle beam and is a hydraulically driven structure and is fixed to the front end of the corridor through steel strands; The core wall cover plate slipform includes a cover plate template, a cover plate walking device, and a cover plate driving system; the cover plate template is a flat slipform template, supported by a cover plate bracket and set along the slope for casting the cover plate; two sets of parallel cover plate walking devices are set at both ends of the cover plate bracket and driven in parallel by the cover plate driving system, and the front end is fixed to the end of the slope through a chain hoist; the cover plate driving system is a hydraulic drive structure; The hydraulic control system is used to synchronously control and drive various hydraulic drive structures.

2. The concrete casting slip form system for the high and steep slope slab corridor structure according to claim 1, characterized in that: The track system includes dowel bars arranged at the bottom of the mold body and inserted into the bedrock surface, a pre-buried track bracket is arranged on the top of the dowel bars, the track bracket is welded to the dowel bars, and the top of the track bracket is connected to the rails through connecting bolts.

3. The concrete casting slip form system for the high-steep slope slab corridor structure according to claim 2, characterized in that: The moving mechanism includes a front roller and a front roller bracket arranged at the front end of the needle beam and a rear roller and a rear roller bracket arranged at the rear end of the needle beam. The front roller is connected to the needle beam through the front roller bracket, and the rear roller is connected to the needle beam through the rear roller bracket. Each roller moves on the rail to realize the movement of the entire sliding form of the corridor under drive.

4. The concrete pouring slip form system for the high and steep slope slab corridor structure according to claim 2, characterized in that: The needle beam is a steel frame beam with a rectangular cross section. The outer sides of the steel frame beam are connected to the corridor top arch formwork, corridor side formwork and corridor bottom formwork through adjustable supports. The needle beam is longitudinally provided with a corridor operating platform, a corridor formwork platform, a corridor plastering platform and a corridor rear hanging platform from top to bottom.

5. The concrete pouring slip form system for the high and steep slope slab corridor structure according to claim 2, characterized in that: The traction system comprises a jack bracket, a steel strand jack, and a steel strand. The steel strand jack is connected to the needle beam through the jack bracket, and the steel strand passes through the steel strand jack and is fixed to the front end of the corridor.

6. The concrete casting slip form system for the high and steep slope slab corridor structure according to claim 1, characterized in that: The cover mold support is a steel structure beam of a truss structure, the cover mold template is fixedly arranged on the bottom surface of the cover mold support, and a cover mold casting platform is arranged at the front end of the steel structure beam of the truss structure, and a cover mold finishing platform is arranged at the rear end.

7. The concrete pouring slip form system for the high and steep slope slab corridor structure according to claim 6, characterized in that: The cover mold walking device includes a cover mold track system and a cover mold moving system arranged on the slopes on both sides; The cover formwork track system includes: cover formwork dowels anchored and inserted into the bedrock surface of the slope, embedded anchor rods are welded on the upper part of the cover formwork dowels, climbing cones are provided on the upper part of the embedded anchor rods, anchor rod turnover joints are provided on the upper part of the climbing cones, cover formwork tracks are provided on the upper part of the anchor rod turnover joints, and embedded cover formwork track brackets are provided at the lower part of the cover formwork track laying line for supporting the track; the cover formwork moving system includes: multiple groups of cover formwork rollers arranged on the two end beams of the cover formwork bracket, and the cover formwork rollers move in a limited position in the cover formwork track with a groove structure.

8. The concrete placement slip form system for the high-steep slope slab corridor structure according to claim 7, characterized in that: The end faces of the cover mold templates at both ends and the bottom of the cover mold rollers are provided with elastic plates for positioning the cover mold templates and fixed to the end faces of the cover mold templates through springs; the front ends of the multiple groups of cover mold rollers at both ends are provided with cover mold guide wheels.

9. The concrete pouring slip form system for the high and steep slope slab corridor structure according to claim 7, characterized in that: The cover die drive system includes two sets of upper and lower reversing boxes and a climbing hydraulic jack drivingly connected therebetween. Each reversing box is provided with a buckle detachably fixed to the buckle of the cover die track wing plate. The front end of the upper reversing box is pin-connected and drivingly connected to the cover die support, and the rear end is connected to the climbing hydraulic jack. The lower reversing box is connected to the other end of the climbing hydraulic jack. Each reversing box is provided with a reversing handle to adjust the moving direction of the one-way stop mechanism and is detachably clamped with the stop bump on the cover die track.

10. The concrete casting slip form system for the high and steep slope slab corridor structure according to any one of claims 1 to 9, characterized in that: The hydraulic control system is arranged on the corridor operation platform and includes a hydraulic control console and is control-connected to each hydraulic drive structure.

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