Subway ultra-deep vertical shaft lining slip form construction device and construction method

Abstract

The invention discloses a subway ultra-deep vertical shaft lining slip form construction device and process, the slip form device comprises a base, a mounting rack, a formwork frame, a lifting mechanism, a modification construction platform and a ladder stand, and the base is arranged and fixed at the bottom of a vertical shaft; the mold frame is hung on the mounting rack; the lifting mechanism is arranged on the base, is connected with the mounting frame and is used for vertically lifting the mounting frame upwards; the decoration construction platform is hung on the mounting frame, is located below the mold frame, is arranged in the circumferential direction of the inner wall of the constructed concrete structure and is used for bearing constructors to carry out surface decoration construction on the wall surface of the constructed concrete structure; the crawling ladder is vertically arranged upwards, the bottom end of the crawling ladder is connected with the modification construction platform, and an operator can climb to the top end of the subway ultra-deep vertical shaft lining slip-form construction device from the modification construction platform through the crawling ladder. According to the construction method, the device is adopted for construction, the method and the device are used for lining construction of the deep vertical shaft, the whole device is simple and economical, the operation method is simple, and therefore the construction quality of the deep vertical shaft can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of shaft construction, and in particular to a slipform construction device for lining a subway ultra-deep shaft. Background Art

[0002] In the prior art, lining is a permanent support structure built with reinforced concrete and other materials along the perimeter of the tunnel body to prevent deformation or collapse of the surrounding rock. In the construction process of deep vertical and lining concrete structure projects such as mountain and water conservancy projects, the support method is generally used for construction.

[0003] The scaffolding method in the prior art is a method of constructing shaft lining by setting up scaffolding at certain intervals in the shaft as the internal support of the mold, and using small pieces of steel templates to form an internal mold for splicing. The scaffolding method lining has extremely high requirements for the site and is suitable for shafts with a small depth. Although the investment is small, the lining construction using the scaffolding method has the disadvantages of high labor intensity required for setting up the scaffolding, the need to set up the scaffolding before lining construction, and the demoulding process is also relatively troublesome. The whole process consumes a long time and the process is complicated, the efficiency is low, and the operator safety is also low. Summary of the invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a subway ultra-deep shaft lining slipform construction device and construction method, which is used for the lining construction of relatively deep shafts, and the whole device is simple and economical, and the operation method is simple, thereby improving the construction quality of deep shafts.

[0005] In order to achieve the above object, the present invention is implemented through the following technical scheme: a subway ultra-deep shaft lining slipform construction device, comprising:

[0006] A base, arranged and fixed at the bottom of the shaft;

[0007] Mounting frame;

[0008] A mold frame, the mold frame is suspended on the mounting frame, and the outer wall size of the mold frame is matched with the perimeter size of the inner wall of the concrete structure to be constructed;

[0009] A lifting mechanism, disposed on the base and connected to the mounting frame, for lifting the mounting frame vertically upward;

[0010] A finishing construction platform is suspended on the mounting frame and is located below the mold frame and is circumferentially arranged around the inner wall of the concrete structure under construction, and is used to carry construction workers to perform surface finishing construction on the wall of the concrete structure under construction; and

[0011] A ladder is arranged vertically upward, and the bottom end of the ladder is connected to the modification construction platform. An operator can climb from the modification construction platform to the top of the subway ultra-deep shaft lining slipform construction device via the ladder.

[0012] Furthermore, the mounting frame includes a plurality of transversely and longitudinally arranged support beams, and the transversely and longitudinally arranged support beams are interconnected to form a frame-type mounting frame.

[0013] Furthermore, the mold frame includes multiple corner molds and multiple flat molds, the corner molds are L-shaped and are arranged at the corners of the shaft, the flat mold is connected between each two adjacent corner molds, and the multiple corner molds and multiple flat molds form a closed mold frame.

[0014] Furthermore, there are multiple groups of lifting mechanisms, and the multiple groups of lifting mechanisms are arranged circumferentially around the mounting frame. The lifting mechanism includes a lifting rod, a lifting frame and a jack. The lifting rod is installed perpendicular to the base, and the bottom end of the base lifting rod is fixedly connected to the base. The lifting rod passes through the core hole of the jack, and the jack can climb upward along the lifting rod.

[0015] A subway ultra-deep shaft lining slipform construction process, using the above-mentioned subway ultra-deep shaft lining slipform construction device to carry out shaft construction, comprising:

[0016] Construction preparation, measurement and layout;

[0017] Tie up the wall reinforcement and install the support rods;

[0018] Assemble the shaft lining slipforms;

[0019] Pour the initial concrete;

[0020] Check and adjust after initial rise;

[0021] From the bottom of the shaft, the driving mold frame slides upward through the gap of the lifting mechanism. During the pause of the mold frame, concrete is poured and cured, and this step is repeated until it is lifted and poured to the top of the shaft;

[0022] Formwork removal and wall maintenance.

[0023] Furthermore, the specific method of the shaft lining slipform device is:

[0024] Set a fixed base plate at the bottom of the shaft, then accurately align and level it;

[0025] Lifting rod installation: The lifting rod is set vertically, and the bottom of the lifting rod is buried and fixed in the base, and the top of the lifting rod extends out of the top of the shaft;

[0026] Install the jack on the lifting rod, install the lifting frame under the jack, fix the installation frame on the lifting frame, install the formwork frame on the installation frame, hang the decoration construction platform under the installation frame, and then install the ladder;

[0027] Install relevant power source devices and carry out debugging.

[0028] Furthermore, the specific method of tying the wall reinforcement and installing the support rod is:

[0029] The steel bar installation adopts the method of sliding and lifting at the same time and parallel operation. The binding of the steel bar is always about 30cm ahead of the concrete, and the steel bar connection adopts cold-stripped straight thread sleeve connection and submerged arc welding connection.

[0030] Further, from the bottom of the shaft, the driving mold frame slides upward through the gap of the lifting mechanism, and during the pause of the mold frame, concrete is poured and maintained until it is lifted to the top of the shaft. The specific method is:

[0031] First, concrete is put into the mold; then the sliding form is lifted, specifically:

[0032] First, pour the first layer of concrete, then pour the second and third layers. When the thickness reaches 70cm, start to drive the formwork frame to slide 3 to 6cm through the lifting mechanism. After checking whether the demoulding concrete is solidified, pour the fourth layer and slide it 6cm. Continue to pour the fifth layer with a total slide of 12 to 15cm. After pouring the sixth layer, the total slide is 20cm. If there is no abnormality, normal pouring and sliding can be carried out. The normal sliding is carried out at an interval of 1 hour each time, and the sliding height is controlled at 30cm. The daily sliding height is controlled at about 4.5m.

[0033] Furthermore, it also includes: during the construction process, if the work must be stopped due to strong winds, heavy rains and other reasons, the work must be stopped and evacuated. The specific handling methods for evacuation are as follows:

[0034] Before stopping work, the concrete surface layer should be leveled, vibrated and the joint reinforcement should be inserted;

[0035] According to the concrete pouring height and temperature, two lifts are performed every half an hour for more than 4 hours;

[0036] When resuming work, the observation of the center line and horizontality and the treatment of the concrete construction joints should be strengthened;

[0037] Slipform construction process: concrete unloading → flat material vibration → sliding → steel bar installation → unloading.

[0038] Furthermore, it also includes:

[0039] During the sliding process, four heavy vertical lines are set at the centers or corners of the four sides. The displacement of the heavy vertical lines relative to the initial concrete is checked every 30cm. If deviation is found, it is corrected in time to ensure that the deformation of the concrete body is within 3cm.

[0040] Beneficial effects of the present invention:

[0041] The above-mentioned subway ultra-deep shaft lining slipform construction device first fixes the base at the bottom of the shaft to set a fixed bottom plate, and then accurately aligns and level it; then buries and fixes the bottom of the lifting rod in the base, so that the top of the lifting rod extends out of the top of the shaft; then installs the jack on the lifting rod, installs the lifting frame under the jack, installs the mounting frame on the lifting frame, installs the formwork frame on the mounting frame, suspends a modified construction platform under the mounting frame, then installs a ladder, and finally installs the relevant power source device and debugs it.

[0042] The construction process adopts this construction device for construction. The staff can stand on the decoration construction platform to carry out concrete wall decoration work. At the same time, they can move up and down by climbing the ladder. In the initial stage of construction, the formwork frame and the decoration construction platform are close to the bottom of the shaft, and then concrete is poured. When the concrete is in a semi-solidified state, the installation frame is slowly lifted by the lifting mechanism 400, thereby driving the formwork frame and the decoration construction platform to rise a certain distance, and then pouring is carried out again. While pouring, the operator can modify the semi-solidified wall, and then follow the same operation method until it reaches the top of the shaft.

[0043] By adopting the above-mentioned device and process, the lining construction of a relatively deep shaft can be carried out, and the whole device is simple and economical, and the construction process is simple, thereby improving the construction quality of the deep shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0045] Figure 1 This is a schematic diagram of the cross section of the vertical shaft that needs to be constructed in the present invention;

[0046] Figure 2 A top view of a subway ultra-deep shaft lining slipform construction device provided by one embodiment of the present invention;

[0047] Figure 3 It is the AA section view in the figure;

[0048] Figure 4 It is a sectional view along the line BB in the figure;

[0049] Figure 5 for Figure 1A schematic diagram of the assembly of a mounting frame, a lifting mechanism and a mold frame in a subway ultra-deep shaft lining slipform construction device is shown;

[0050] Figure 6 for Figure 1 A top view of the arrangement of a top working platform and a ladder in a slipform construction device for a subway ultra-deep shaft lining is shown;

[0051] Figure 7 for Figure 1 A top view of the final arrangement of the power source associated with the installation of a subway ultra-deep shaft lining slipform construction device is shown;

[0052] Figure 8 for Figure 1 Three views of a corner form in a slipform construction device for ultra-deep shaft lining of a subway are shown;

[0053] Fig. 9 for Figure 1 Three views of a flat plate formwork in a slipform construction device for a subway ultra-deep shaft lining are shown;

[0054] Fig.10 for Figure 1 A schematic diagram of a lifting frame in a slipform construction device for ultra-deep shaft lining in a subway is shown;

[0055] Fig.11 A schematic diagram of a slipform construction process for subway ultra-deep shaft lining provided by an embodiment of the present invention;

[0056] Reference numerals:

[0057] 100, shaft section; 200, mounting frame; 300, formwork frame; 310, corner formwork; 320, flat plate formwork; 400, lifting mechanism; 410, lifting rod; 420, lifting frame; 430, jack; 500, modified construction platform; 600, ladder, 700- top working platform. DETAILED DESCRIPTION

[0058] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the invention is not limited by the specific implementation disclosed below.

[0059] See also Figures 1 to 10 The present invention provides a subway ultra-deep shaft lining slipform construction device, including a base, a mounting frame 200, a mold frame 300, a lifting mechanism 400, a modified construction platform 500 and a ladder 600.

[0060] Specifically, the base is fixed at the bottom of the shaft; the formwork 300 is suspended on the mounting frame 200, and the outer wall size of the formwork 300 is matched with the perimeter size of the inner wall of the concrete structure to be constructed; the lifting mechanism 400 is arranged on the base, connected to the mounting frame 200, and is used to lift the mounting frame 200 vertically upward. The decoration construction platform 500 is suspended on the mounting frame 200, and is located below the formwork 300, and is arranged circumferentially around the inner wall of the concrete structure to be constructed, and is used to carry construction personnel to perform surface decoration construction on the wall of the concrete structure to be constructed. The ladder 600 is arranged vertically upward, and the bottom end of the ladder 600 is connected to the decoration construction platform 500, and the operator can climb from the decoration construction platform 500 to the top of the subway ultra-deep shaft lining slipform construction device through the ladder 600.

[0061] In the specific implementation, the sliding mold is assembled first, and the specific method is as follows:

[0062] First, fix the base at the bottom of the shaft to set a fixed bottom plate, and then accurately align and level it; then bury and fix the bottom of the lifting rod 410 in the base, so that the top of the lifting rod 410 extends out of the top of the shaft; then install the jack 430 on the lifting rod 410, install the lifting frame 420 at the bottom of the jack 430, install the mounting frame 200 on the lifting frame 420, install the mold frame 300 on the mounting frame 200, hang the decoration construction platform 500 under the mounting frame 200, and then install the ladder 600, and finally install the relevant power source device and debug it.

[0063] During construction, workers can stand on the decoration construction platform 500 to carry out concrete wall decoration work, and at the same time, they can move up and down through the ladder 600. In the initial stage of construction, the formwork 300 and the decoration construction platform 500 are close to the bottom of the shaft, and then concrete is poured. When the concrete is in a semi-solidified state, the installation frame 200 is slowly lifted by the lifting mechanism 400, thereby driving the formwork 300 and the decoration construction platform 500 to rise a certain distance, and then pouring is carried out again. While pouring, the operator can modify the semi-solidified wall, and then follow the same operation method until it reaches the top of the shaft.

[0064] The above device can be used for lining construction of deeper shafts, and the whole device is simple and economical.

[0065] In this embodiment, the mounting frame 200 includes a plurality of support beams arranged transversely and longitudinally, and the support beams arranged transversely and longitudinally are connected to each other to form a frame-type mounting frame 200. In specific implementation, the support beams can be welded by assembling double [12b steel and 12mm steel plate (Q235B), and the welding adopts fillet welds, and the weld leg size is: hf≥6mm. However, it must not be less than the minimum material thickness.

[0066] In addition, in a specific implementation, multiple groups of mounting racks 200 can be provided, and multiple groups of mounting racks 200 are arranged at intervals from top to bottom. Multiple layers of mounting racks 200 can improve the stability of the entire device.

[0067] In addition, a top working platform 700 may be provided on the uppermost mounting frame 200 to place tools, materials, and the like.

[0068] In this embodiment, the mold frame 300 includes multiple corner molds 310 and multiple flat molds 320. The corner molds 310 are L-shaped and are arranged at the corners of the vertical shaft. A flat mold 320 is connected between each two adjacent corner molds 310. The multiple corner molds 310 and the multiple flat molds 320 form a closed mold frame 300.

[0069] In specific implementation, the flat plate mold 320 can be made of 6m (Q235B) steel plate, the angle mold 310 can be made of L80X8 or 12mx80 steel plate, the flange middle ribs can be made of 8# channel steel (Q235), the 6mm thick * 80 wide rib plate (Q235B) back ribs can be made of double 12# channel steel. The support frame can be made of double 12# channel steel (Q235).

[0070] In this embodiment, there are multiple groups of lifting mechanisms 400, which are circumferentially arranged around the mounting frame 200, and the lifting mechanisms 400 include a lifting rod 410, a lifting frame 420, and a jack 430. The lifting rod 410 is installed perpendicular to the base, and the bottom end of the base lifting rod 410 is fixedly connected to the base, and the lifting rod 410 passes through the center hole of the jack 430, and the jack 430 can climb upward along the lifting rod 410.

[0071] In the specific implementation, the jack 430 is a QYD-100 wedge-type hydraulic jack 430. The rated working pressure is 8-10MPa, the working lifting weight is 50KN, the maximum lifting weight is 100KN, and the stroke is ≥35mm. The single mass of the hydraulic jack is 40kg;

[0072] The lifting frame 420 is assembled and welded with [20b steel plate (Q235B).

[0073] The climbing rod is made of φ48X4 steel pipe, and the steel pipe is extended by welding (or thread joint). The welding joint should be straight, and it needs to be polished smooth and smooth with an angle grinder after welding to ensure smooth passage of the hydraulic jack. The welding joints of adjacent climbing rods should be staggered by 50cm, and the welding joints should be stationary at the same horizontal height.

[0074] In addition, fillet welds are used for welding steel components, and the weld leg size is: hf≥6mm. However, it must not be less than the minimum material thickness.

[0075] In this embodiment, the decoration construction platform 500 is composed of a support frame and a protective net. A walkway board is laid at the bottom of the support frame, and a protective net is set around it. When the concrete wall needs to be decorated, the target position is found and the protective net at the corresponding position is opened. The panel of the walkway board is made of 3mm patterned steel plate, the frame and main ribs are made of L60×6 or 6mm×60 steel plate, and the ribs are made of 6mm×60 steel plate. The walkway railings are made of DN40 steel pipes.

[0076] The ladder width of the ladder 600 is 650mm, the ladder beam is made of 10# angle steel, the step rod is made of φ32×3 steel pipe, the handrail is made of φ38*3 steel pipe, and the steel ladder 600 is connected by M20×70 (8.8s) bolts, and the bolt holes are Strip holes.

[0077] Please refer to 11. In addition, the present application also provides a subway ultra-deep shaft lining slipform construction process. The process adopts the above-mentioned subway ultra-deep shaft lining slipform construction device to carry out shaft construction, and includes the following steps:

[0078] S110, construction preparation, measurement and layout;

[0079] S120, tie up the wall reinforcement and install the support rods;

[0080] S130, assembling the shaft lining slipform device;

[0081] S140, pouring initial concrete;

[0082] S150, inspection and adjustment after initial rise;

[0083] S160, from the bottom of the shaft, the driving mold frame 300 is slid upward through the gap of the lifting mechanism 400, and during the pause of the mold frame 300, concrete is poured and cured, and this step is repeated until the concrete is lifted and poured to the top of the shaft;

[0084] S170, demoulding and wall maintenance.

[0085] In this embodiment, the specific method of assembling the sliding form is:

[0086] S110. Set a fixed base plate at the bottom of the shaft, and then accurately align and level it;

[0087] S120, installation of the lifting rod 410: the lifting rod 410 is vertically arranged, and the bottom of the lifting rod 410 is buried and fixed in the base, and the top of the lifting rod 410 extends out of the top of the shaft;

[0088] S130, install the jack 430 on the lifting rod 410, install the lifting frame 420 under the jack 430, install the mounting frame 200 on the lifting frame 420, install the mold frame 300 on the mounting frame 200, hang the decoration construction platform 500 under the mounting frame 200, and then install the ladder 600;

[0089] S140. Install relevant power source devices and perform commissioning.

[0090] In this embodiment, the method of tying the steel bars and installing the support rods is as follows:

[0091] While tying the wall reinforcement and installing the support rods, the sliding formwork can be assembled at the same time. The reinforcement installation adopts the method of sliding and installing the reinforcement at the same time, and the parallel operation method. The reinforcement tying is always about 30cm ahead of the concrete. In order to ensure the sliding formwork speed, the reinforcement connection adopts cold-stripped straight thread sleeve connection and submerged arc welding connection. The vertical transportation of the reinforcement is carried out by crane or tower crane to the sliding formwork workbench.

[0092] The steel bars are made in the processing shed, and the accuracy of the steel bars must be ensured. To verify the accuracy of steel bar production, a binding test can be carried out on the ground after bending a small amount of steel bars, and the bending method and size can be adjusted according to the experimental results. The steel bars with determined shapes and sizes can be effectively controlled by regular ruler inspections. The steel bars must be strictly managed in terms of feeding and outgoing, and the processed steel bars must be stored in categories and marked. The marking content includes specifications, models, installation locations, etc. Materials that do not meet the inspection requirements should be marked to prevent misuse.

[0093] In this embodiment, the mold frame 300 is driven to slide upward from the bottom of the shaft through the gap of the lifting mechanism 400. When the mold frame 300 is paused, concrete is poured and cured until it is lifted to the top of the shaft. The specific method is: first put concrete into the mold, and then slide the mold upward.

[0094] The specific operation of concrete pouring into the mold is as follows:

[0095] Concrete is transported by crane or pump, and the material is fed into the mold by the feeding system. In order to ensure that the concrete is smoothly put into the mold, the concrete must have good workability and no segregation. The slump of the concrete entering the mold should be controlled at 12-14cm.

[0096] In addition, when it is necessary to explain, during the slipform construction, attention should be paid to the mixing, pouring, vibrating and curing of concrete:

[0097] Slipforms are easy to cast low-fluidity or semi-hard concrete. Concrete pouring should be carried out in layers and sections symmetrically. The layer thickness should be 20cm-30cm. After pouring, the concrete surface should be at least 10cm-15cm away from the upper edge of the formwork.

[0098] When concrete is poured into the mold, it must be evenly distributed and compacted using an inserted vibrator. Avoid touching the steel bars and formwork during vibration, and the depth of the vibrator inserted into the next layer of concrete must not exceed 5 cm.

[0099] According to the experience of previous slipform projects, when the strength reaches 0.2MPa-0.5Mpa, the slipform can slide upward. The sliding range of the slipform is 10cm / h, the template height is 1.25m, and it takes 12.5h for the first layer of concrete to completely detach from the template. The initial setting time of concrete is 1-3h, and the final setting time is 8-10h. The time it takes for concrete to detach from the template is greater than the maximum final setting time. According to daily construction experience, C40 concrete generally takes about 6h and the strength can reach 2.5Mpa. Due to the requirements of the slipform process, the construction adopts 24h uninterrupted construction.

[0100] After the concrete is separated from the formwork, it begins to cure, and curing is carried out by applying curing agent.

[0101] The specific operation of sliding mode lifting is as follows:

[0102] The initial pouring of concrete and the initial sliding of the formwork should be carried out strictly according to the following steps: the first concrete pouring is 10cm, followed by pouring the second layer at a layer thickness of 30cm. After pouring the third layer, when the thickness reaches 70cm, it starts to slide 3-6cm to check whether the demoulding concrete is properly solidified. After pouring the fourth layer, it slides 6cm, and continues to pour the fifth layer with a total sliding of 12-15cm. After pouring the sixth layer, it slides 20cm. If there is no abnormality, normal pouring and sliding can be carried out.

[0103] The initial sliding of the slipform should be carried out slowly, and during this process, the hydraulic device, mold structure and related facilities should be fully checked under load. If any problems are found, they should be dealt with in time. Normal sliding can be carried out only after everything is normal. When the construction is transferred to normal sliding, continuous construction should be maintained as much as possible, and a special person should be assigned to observe and analyze the surface conditions of the concrete to determine the appropriate sliding time, and identify it according to the following points: a "rustling" sound can be heard during the sliding process; the demoulded concrete has no flow or cracking phenomenon, feels hard when pressed by hand, and can leave fingerprints of about 1mm, and can be smoothed with a mud board (trowel). For normal sliding of the slipform, determine the reasonable sliding speed according to the on-site construction conditions, and control the sliding height to 30cm at an interval of 1 hour each time according to normal sliding, and the daily sliding height is controlled at about 4.5m.

[0104] Surface finishing is an important process of slipform concrete, which must be carried out immediately after the concrete is demoulded. Generally, a trowel is used to flatten or repair the concrete surface with slurry. If the surface is flat, no finishing is required. In order to ensure that the poured concrete has suitable hardening conditions and prevent cracks, a sprinkler pipe is installed on the auxiliary workbench to maintain the structure.

[0105] In addition, as a preferred embodiment, the method also includes the following steps: if the construction process must be stopped due to strong winds, heavy rains and other reasons, the work must be stopped and evacuated. The specific evacuation method is as follows:

[0106] Before stopping work, the concrete surface layer should be leveled, vibrated and the joint reinforcement should be inserted;

[0107] According to the concrete pouring height and temperature, two lifts are performed every half an hour for more than 4 hours;

[0108] When resuming work, the observation of the center line and horizontality and the treatment of the concrete construction joints should be strengthened;

[0109] Slipform construction process: concrete unloading → flat material vibration → sliding → steel bar installation → unloading.

[0110] In addition, when this construction method is used, the formwork will deviate during the sliding process when affected by various uneven dynamic forces. In order to facilitate and timely observe the deviation of the formwork, four heavy vertical lines are set at the centers or corners of the four sides. The displacement of the heavy vertical lines relative to the initial concrete is checked every 30cm of sliding. If deviation is found, it is corrected in time to ensure that the deformation of the concrete body is within 3cm. The project department's surveying team measures twice a day (morning and evening) to control the deviation in real time.

[0111] After the concrete pouring and curing are completed, the slipform template needs to be dismantled. The dismantling of the slipform platform is the last step of the slipform project and is also a key construction process of the slipform construction. It mainly requires the adoption of reasonable construction technology, orderly construction sequence and reliable safety assurance measures. The method of dismantling the slipform platform of this project adopts the method of dismantling the template piece by piece after the template slides empty. When it slides up to the top of the shaft and the concrete strength reaches more than 70%, the device can be dismantled. The dismantling sequence is as follows:

[0112] Removal method:

[0113] 1) When the subway ultra-deep shaft lining slipform construction device slides up to the first elevation of the shaft as a whole, it continues to slide at the normal sliding speed. When the bottom of the device is 200mm away from the concrete surface, the sliding is stopped. After the concrete strength reaches 70% of the design grade, the device can be dismantled.

[0114] 2) All the excess materials, equipment and construction waste on the slipform platform shall be cleaned up and hoisted to the ground, the lighting lines, lamps and cable facilities shall be removed, the oil pipes, oil circuits and hydraulic control cabinets of the hydraulic control system shall be removed, and then the platform structure shall be prepared for dismantling.

[0115] 3) The platform must be dismantled in sequence from one side of the tower body. First, all the safety nets connected to the platform must be dismantled. According to the door frame layout, each group of three frames must be dismantled. First, the walkway boards, wooden beams and connectors on the platform that need to be dismantled must be removed. Then, the template enclosure must be cut off, the template buckles and connectors must be removed, and the platform must be hung steadily with a tower crane to make it bear force. Then, the steel rings and rods connecting the door frames must be removed, the springboard on the hanger must be removed, and the hanger fences must be cut off from top to bottom. Check whether the part to be dismantled is completely separated from the undismantled part. After there is no connection, cut off the three door frame support rods, and use the tower crane to lift the dismantled part away from the tower body and transport it to the ground. Dismantle, clean, trim and stack it on the ground. Each other piece must be dismantled in this way.

[0116] It should be noted that in this application:

[0117] The strength of the secondary lining concrete is C40 (P12), and commercial concrete is used. When pouring concrete, it is necessary to plan the concrete transportation route and the location of the pump truck in advance, and transport it to the working surface through the delivery pump. When pouring, both sides should be poured symmetrically at the same time, and the pouring speed and pouring thickness should be strictly controlled to prevent the wall mold expansion and explosion caused by too fast concrete pouring speed, as well as the temperature gap caused by excessive hydration heat, and to prevent the formation of cold joints due to too slow concrete pouring speed. When pouring concrete, a ground pump is set on the ground to transport the concrete to the pouring surface through a chute or a series of channels.

[0118] The above-mentioned subway ultra-deep shaft lining slipform construction device and construction process:

[0119] The lining construction of a deeper shaft can be realized, and the whole device is simple and economical, and the operation process is simple and convenient.

[0120] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A subway ultra-deep shaft lining slipform construction device, characterized in that: include: A base, arranged and fixed at the bottom of the shaft; Mounting frame; A mold frame, the mold frame is suspended on the mounting frame, and the outer wall size of the mold frame is matched with the perimeter size of the inner wall of the concrete structure to be constructed; A lifting mechanism, disposed on the base and connected to the mounting frame, for lifting the mounting frame vertically upward; A finishing construction platform is suspended on the mounting frame and is located below the mold frame and is circumferentially arranged around the inner wall of the concrete structure under construction, and is used to carry construction workers to perform surface finishing construction on the wall of the concrete structure under construction; and A ladder is arranged vertically upward, and the bottom end of the ladder is connected to the modification construction platform. An operator can climb from the modification construction platform to the top of the subway ultra-deep shaft lining slipform construction device via the ladder.

2. The subway ultra-deep shaft lining slipform construction device according to claim 1 is characterized in that: The mounting frame includes a plurality of support beams arranged transversely and longitudinally, and the support beams arranged transversely and longitudinally are connected to each other to form a frame-type mounting frame.

3. The subway ultra-deep shaft lining slipform construction device according to claim 2 is characterized in that: The mold frame includes multiple corner molds and multiple flat molds. The corner molds are L-shaped and are arranged at the corners of the shaft. The flat mold is connected between each two adjacent corner molds. The multiple corner molds and multiple flat molds form a closed mold frame.

4. The subway ultra-deep shaft lining slipform construction device according to claim 1 or 2, characterized in that: There are multiple groups of lifting mechanisms, which are circumferentially arranged around the mounting frame. The lifting mechanism includes a lifting rod, a lifting frame and a jack. The lifting rod is installed perpendicular to the base, and the bottom end of the base lifting rod is fixedly connected to the base. The lifting rod passes through the core hole of the jack, and the jack can climb upward along the lifting rod.

5. A slipform construction process for ultra-deep shaft lining of subway, characterized in that: The subway ultra-deep shaft lining slipform construction device according to any one of claims 1 to 4 is used to carry out shaft construction, comprising: Construction preparation, measurement and layout; Tie up the wall reinforcement and install the support rods; Assemble shaft lining slipforms; Pour the initial concrete; Check and adjust after initial rise; From the bottom of the shaft, the driving mold frame slides upward through the gap of the lifting mechanism. During the pause of the mold frame, concrete is poured and cured, and this step is repeated until it is lifted and poured to the top of the shaft; Formwork removal and wall maintenance.

6. The subway ultra-deep shaft lining slipform construction process according to claim 5 is characterized in that: The specific method of assembling the shaft lining slipform is as follows: Set a fixed base plate at the bottom of the shaft, then accurately align and level it; Lifting rod installation: The lifting rod is set vertically, and the bottom of the lifting rod is buried and fixed in the base, and the top of the lifting rod extends out of the top of the shaft; Install the jack on the lifting rod, install the lifting frame under the jack, fix the installation frame on the lifting frame, install the formwork frame on the installation frame, hang the decoration construction platform under the installation frame, and then install the ladder; Install relevant power source devices and carry out debugging.

7. The subway ultra-deep shaft lining slipform construction process according to claim 5 is characterized in that: The specific method of tying the wall reinforcement and installing the support rod is as follows: The steel bar installation adopts the method of sliding and lifting at the same time and parallel operation. The binding of the steel bar is always about 30cm ahead of the concrete, and the steel bar connection adopts cold-stripped straight thread sleeve connection and submerged arc welding connection.

8. The subway ultra-deep shaft lining slipform construction process according to claim 5 is characterized in that: From the bottom of the shaft, the driving mold frame slides upward through the gap of the lifting mechanism. During the pause of the mold frame, concrete is poured and maintained until it is lifted to the top of the shaft. The specific method is: First, concrete is put into the mold; then the sliding form is lifted, specifically: First, pour the first layer of concrete, then pour the second and third layers. When the thickness reaches 70cm, start to drive the formwork frame to slide 3 to 6cm through the lifting mechanism. After checking whether the demoulding concrete is solidified, pour the fourth layer and slide it 6cm. Continue to pour the fifth layer with a total slide of 12 to 15cm. After pouring the sixth layer, the total slide is 20cm. If there is no abnormality, normal pouring and sliding can be carried out. The normal sliding is carried out at an interval of 1 hour each time, and the sliding height is controlled at 30cm. The daily sliding height is controlled at about 4.5m.

9. The subway ultra-deep shaft lining slipform construction process according to claim 5, characterized in that: Also includes: During the construction process, if the work must be stopped due to strong winds, heavy rains and other reasons, the work must be stopped and evacuated. The specific handling methods for evacuation are as follows: Before stopping work, the concrete surface layer should be leveled, vibrated and the joint reinforcement should be inserted; According to the concrete pouring height and temperature, two lifts are performed every half an hour for more than 4 hours; When resuming work, the observation of the center line and horizontality and the treatment of the concrete construction joints should be strengthened; Slipform construction process: concrete unloading → flat material vibration → sliding → steel bar installation → unloading.

10. The subway ultra-deep shaft lining slipform construction process according to claim 5, characterized in that: Also includes: During the sliding process of the slipform, four heavy plumb lines are set at the centers or corners of the four sides. The displacement of the heavy plumb lines relative to the initial concrete is checked every 30cm of sliding. If any deviation is found, it is corrected in time to ensure that the deformation of the concrete body is within 3cm.

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