Construction method of station platform flange plate of newly-added station of operation line

Abstract

The present application relates to the technical field of station construction, and particularly relates to a construction method of a newly-added station platform flange plate of an operating line, comprising the following steps: S1, construction preparation, including construction decomposition, construction lofting and determination of train speed; S2, steel reinforcement framework binding; S3, installation of a formwork hanger, one end of the formwork hanger is fixed to the top surface of a platform beam, and the other end of the formwork hanger extends out of the platform beam to form a cantilever section; S4, installation of a pouring formwork; S5, concrete pouring. By determining a suitable train speed before construction, resonance of the flange plate formwork system caused by disturbance of air power is avoided, the adverse effect of a high-speed train on the flange plate pouring process is reduced, and construction decomposition is performed according to the sky window operation time, so that the sky window operation time is fully and reasonably utilized to complete construction operation. Meanwhile, the formwork system is fixed to the platform beam by forming a cantilever, so that the setting of the formwork system and the pouring process do not affect the normal operation of the train, thereby guaranteeing construction quality, construction safety and train safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of station construction, in particular to a construction method of a platform flange plate of a newly-added station on an operating line. BACKGROUND

[0002] With the rapid development of high-speed rail and intercity rail, it is inevitable to update and transform the platform on the operating line. When adding or transforming the platform on the operating line, the flange plate and the platform beam need to be independently poured or the original platform beam is used due to the close distance to the operating line. The flange plate needs to be connected with the platform beam by steel bar binding and then poured with concrete to be integrated.

[0003] However, since the high-speed rail line needs to operate normally during the day, the construction must be completed after the high-speed rail is shut down and before the operation the next day. Therefore, it can only be carried out during the night window. The night window operation time is short, the safety risk is high, the platform flange plate pouring construction is close to the operating line, the air pressure of the high-speed train operation will exert aerodynamic force on the flange plate concrete pouring formwork, which is easy to cause formwork and concrete vibration, thereby affecting the quality of the poured concrete, the bonding performance of the new and old concrete joint surface, and the overall construction quality. At the same time, the pouring formwork is close to the operating line, and the installation quality will not only affect the quality of the concrete pouring of the flange plate, but also affect the safety of train operation.

[0004] Therefore, there is an urgent need for a technical solution to solve the technical problems of short night window operation time, high safety risk, and adverse effects of flange plate pouring by train operation air pressure when adding or transforming the platform of the station on the operating line, and easy influence on train operation safety. SUMMARY

[0005] The present application aims to provide a construction method of a platform flange plate of a newly-added station on an operating line to solve the technical problems of short night window operation time, high safety risk, and adverse effects of flange plate pouring by train operation air pressure when adding or transforming the platform of the station on the operating line, and easy influence on train operation safety.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] A construction method of a platform flange plate of a newly-added station on an operating line, comprising the following steps:

[0008] S1, construction preparation, the construction preparation comprising construction decomposition, construction lofting and train speed determination;

[0009] S2, steel bar framework binding, the steel bar framework is fixedly connected with the platform beam steel bar;

[0010] S3, template hanger installation, one end of the template hanger is fixed to the top surface of the platform beam, and the other end extends out of the platform beam to form a cantilever section;

[0011] S4, pouring form installation, the pouring form includes a bottom form, a side form and an end form, the bottom form is connected to the cantilever section through a pull rod hanging connection, the side form is fixedly connected to the cantilever section, and the end form is fixedly connected to the steel reinforcement cage to form a pouring space;

[0012] S5, concrete pouring.

[0013] The construction method of the operating line newly-added station platform flange plate of the application avoids the disturbance of aerodynamic force to cause resonance of the flange plate formwork system, reduces the adverse effects of high-speed trains on the flange plate pouring process, and decomposes the construction according to the sky window operation time, fully and reasonably utilizes the sky window operation time to complete the construction operation, at the same time, the combination of the formwork hanger and the pouring formwork realizes the cantilever installation of the flange plate pouring formwork on the platform beam by the formwork hanger, forms the formwork system with the cantilever fixed to the platform beam, and makes the setting of the formwork system and the pouring process not affect the normal operation of the train, so as to ensure the construction quality, construction safety and train operation safety.

[0014] As a preferred scheme of the application, in step S1, the construction decomposition includes: dividing the construction operation surface into several spans along the longitudinal direction of the line, each span including two frames symmetrically arranged relative to the line, and dividing the construction operation process into several construction procedures, and one sky window operation time can complete one construction procedure of one frame; and the construction lofting includes setting a longitudinal control line on the top surface of the platform beam with the line center line as the reference. By decomposing the construction operation surface and the construction procedure according to the sky window operation time, the sky window operation time can be fully and reasonably utilized to complete the construction operation, and the overall construction period is shortened.

[0015] As a preferred scheme of the application, during the process of all the construction procedures, platform clearance detection is performed according to the longitudinal control line, and the platform clearance detection includes point-by-point detection at equal intervals by using a clearance ruler, and / or infrared equipment is arranged at the longitudinal ends of the platform beam to assist in detection. By performing platform clearance detection during the whole construction process, the platform clearance during the construction operation process is strictly controlled to meet the design requirements, the train operation safety is ensured, and the quality of the flange plate concrete is improved.

[0016] As a preferred scheme of the present application, in step S1, the train speed satisfies that the self-vibration frequency of the formwork system composed of the formwork hanger and the pouring formwork is not intersected with the disturbance frequency range of the train aerodynamic force, the disturbance frequency of the train aerodynamic force is obtained by numerical simulation software analysis and calculation, and the self-vibration frequency of the formwork system is obtained by establishing a finite element model by finite element software analysis. The numerical simulation software analyzes the aerodynamic force acting on the flange plate position when the train passes at different speeds to accurately obtain the range of the disturbance frequency of the train aerodynamic force, the finite element software establishes a finite element model of the formwork system to investigate the dynamic response of the flange plate formwork system under the action of the aerodynamic force to obtain the self-vibration frequency range of the flange plate formwork system, and then ensure that the disturbance frequency of the train aerodynamic force and the self-vibration frequency range of the flange plate formwork system are not intersected, so as to ensure that the flange plate formwork system will not resonate when the high-speed train passes.

[0017] As a preferred scheme of the present application, step S2 includes: chiseling out and downgrading the reinforcement on the upper layer of the platform beam, binding to form a reinforcement framework adapted to the structural characteristics of the flange plate, arranging stool bars between the reinforcement framework, and distributing and binding blocks for abutting the pouring formwork below the reinforcement framework. By arranging the stool bars and the blocks, the overall stiffness of the bound reinforcement framework is improved as a whole, the vibration influence of train operation on the concrete pouring and curing process is further reduced, the overall structural stability of the formwork system is improved, and the overall quality of the prepared flange plate is further improved.

[0018] As a preferred scheme of the present application, step S3 specifically includes the following steps: S3.1, arranging a plurality of hangers on the top surface of the platform beam at intervals, one end of the hanger is located on the top surface of the platform beam, and the other end extends out of the platform beam; S3.2, arranging a plurality of pressing plates on the hanger, and fixing the hanger by anchoring the pressing plates to the top surface of the platform beam. By cooperating the pressing plates and the pressing rods, the stable fixation of the hanger on the platform beam is realized, and a formwork hanger with stable structure is provided.

[0019] As a preferred scheme of the present application, step S3.1 specifically includes: matching the platform limit by the cantilever end of the hanger and used for fixedly connecting the side form, or, connecting transition rods in parallel and staggered at the cantilever end of each hanger, and matching the platform limit by the end of the transition rod and used for fixedly connecting the side form. By matching the platform limit by the hanger or the transition rod, the installation precision of the formwork hanger is improved, and the setting of the formwork hanger does not affect the operation safety of the train.

[0020] As a preferred scheme of the present application, step S4 specifically comprises the following steps: S4.1, hoisting the bottom die to the top surface of the platform beam, pushing into the flange plate below and then lifting into place; S4.2, arranging a pull rod vertically through the steel reinforcement framework and the bottom die between adjacent hangers, the top and bottom of the pull rod being connected to the die components respectively, the die components at the top being overlapped along the line longitudinal direction on the top surface of at least two hangers; S4.3, fixedly connecting the side die at the cantilever end of the hanger, and fixedly connecting the side die close to one side of the platform beam to the steel reinforcement framework through a diagonal rod, and fixedly connecting the bottom of the side die to the side wall of the platform beam through a cable stay. The pre-precise of the bottom die makes the installation of the pouring die faster, improves the construction efficiency, and shortens the sky window operation time. Meanwhile, the combination of the die components and the pull rod and the fixing structure of the side die make the pouring die setting stable, the overall rigidity good, and the displacement intrusion in the pouring process effectively avoided, thereby ensuring the normal operation of the train.

[0021] As a preferred scheme of the present application, the die component comprises two parallel arranged pressing rods, the pressing rods being longitudinally arranged along the line or being connected in splicing, a passing gap being formed between the two pressing rods, the pull rod passing through the passing gap, a plurality of the pull rods being arranged at intervals along the passing gap, a plurality of the die components being arranged at intervals along the longitudinal direction of the hanger, the pull rod passing through the two sides of the pouring space being detachably connected to pressing components respectively, the pressing components being used for abutting against the die components. The die component structure is simple, cooperates with the pull rod, realizes the multi-point distributed pull rod fixing, and improves the installation stability of the pouring die.

[0022] As a preferred scheme of the present application, in step S5, the concrete pouring adopts the cantilever cast-in-place and cross-by-cross parallel flow operation mode, the cross-by-cross parallel flow operation mode comprising different construction procedures of the adjacent synchronous construction processes along the line longitudinal direction within the same sky window operation time, the construction procedures comprising steel reinforcement pretreatment, steel reinforcement framework binding, die hanger installation, pouring die installation, and concrete pouring. The construction operation is fully and reasonably completed within the sky window operation time, the operation surface intersection of each procedure is prevented, the construction safety is improved, the number of sky windows used is saved, thereby shortening the construction period. Meanwhile, through the detailed construction procedure, the sky window operation time is reasonably utilized, the cantilever cast-in-place mode is adopted, the train is not stopped for operation, the disturbance of the train to the cast-in-place concrete is reduced, and the construction quality is improved.

[0023] In summary, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0024] 1. By determining the appropriate train speed before construction, the resonance of the flange plate die system caused by the disturbance of the air power is avoided, and the adverse effects of the high-speed train passing on the flange plate pouring process are reduced.

[0025] 2. Construction decomposition according to skylight operation time, fully and reasonably utilizing skylight operation time to complete construction operation;

[0026] 3. Through template hanger and pouring formwork combination, forming formwork system which is cantilevered fixed on platform beam, so that the setting of formwork system and pouring process will not affect the normal operation of train, thereby guaranteeing construction quality, construction safety and train operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of a newly-added station platform structure of an operating high-speed rail line in embodiment 1;

[0028] Figure 2 is a flowchart of a construction method of a newly-added station platform flange plate of an operating line according to the present application;

[0029] Figure 3 is a typical aerodynamic force curve of a high-speed train in embodiment 1;

[0030] Figure 4 is a schematic diagram of division of the platform beam in embodiment 1;

[0031] Figure 5 is an axial side view of the formwork system in the present application;

[0032] Figure 6 is a side view of the formwork system in the present application in use state;

[0033] Figure 7 is a top view of the formwork system in the present application in use state;

[0034] Figure 8 is a structural schematic diagram of setting a transition rod for the retractable hanger in embodiment 3.

[0035] FIG.:

[0036] 1 - platform beam, 2 - flange plate, 3 - template hanger, 31 - hanger, 32 - pressing plate, 33 - transition rod, 4 - inclined rod, 5 - cable, 6 - pressing formwork component, 61 - pressing rod, 62 - passing gap, 7 - pulling rod, 71 - pressure joint, 8 - pouring formwork, 81 - bottom die, 82 - side die. DETAILED DESCRIPTION

[0037] The present application will be described in detail below with reference to the drawings.

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0039] Example 1

[0040] This embodiment uses a newly added station platform on an operating high-speed railway line as an example for illustration. This station is the first newly added station on an operating high-speed railway viaduct in the country. Figure 1 As shown, the platform beam 1 flange 2 of the newly designed station extends into the inner side of the crash barrier. Its outer edge is only 1830mm away from the center of the track, and the outer edge of flange 2 is only 200mm away from the edge of the moving train. The flange 2 formwork system is not easy to install stably on the existing platform beam 1. Moreover, after the formwork system is erected, it is close to the edge of the train. The flange 2 pouring construction is close to the operating line. The air pressure of the high-speed train will exert aerodynamic force on the flange 2 formwork system, causing the formwork system and concrete to vibrate. This will affect the quality of the poured concrete, the bonding performance of the new and old concrete interface, and the overall construction quality. At the same time, since the high-speed rail line needs to run trains normally during the day, the construction must be completed after the high-speed rail stops operating and before the next day's operation. Therefore, it can only be carried out during the nighttime maintenance window. However, the maintenance window is short and the risk factor is very high. The installation and pouring process of the flange 2 formwork system can also easily affect the normal operation of the train.

[0041] like Figure 2 As shown, this embodiment proposes a construction method for the flange plate of a newly added station platform on an operating line, which addresses the above-mentioned situation. Specifically, it includes the steps of construction preparation, steel reinforcement cage binding, formwork hanger 3 installation, pouring formwork 8 installation, and concrete pouring. The formwork hanger 3 and the pouring formwork 8 are used to form the flange plate 2 formwork system. The formwork hanger 3 enables the cantilever hanging installation of the flange plate 2 pouring formwork 8 on the platform beam 1.

[0042] Specifically, the construction preparation includes construction breakdown, construction layout, and determination of vehicle speed, which can be carried out simultaneously or sequentially.

[0043] Preferably, the train speed satisfies the condition that when the train passes at this speed, the natural frequency of the template system caused by the aerodynamic force acting on the template system does not intersect with the disturbance frequency range of the train's aerodynamic force.

[0044] Specifically, such as Figure 6As shown, in this embodiment, the formwork hanger 3 is cantilevered and fixed to the platform beam 1. The cantilever section of the formwork hanger 3 is used to install and connect the casting formwork 8. The casting formwork 8 is formed by the bottom formwork 81, the side formwork 82 and the end formwork to form the casting space. Before the concrete is poured, the aerodynamic force generated by the train operation may cause the formwork system to float. When the generalized frequency of the aerodynamic force and the natural frequency of the formwork system coincide, resonance may occur, which will aggravate the vibration of the formwork system. Therefore, before the formal construction, numerical simulation software is used to obtain the aerodynamic force acting on the flange plate 2 when the high-speed train passes at different speeds. The aerodynamic force disturbance frequency of the high-speed train is determined by aerodynamic force analysis to ensure that the natural frequency of the flange plate 2 formwork system can be far away from the disturbance frequency of the train's aerodynamic force, so as to avoid resonance.

[0045] Preferably, numerical simulation software can be selected from Phoenics, CFX, STAR-CD, FLUENT, etc. In this embodiment, the standard k-ε two-equation turbulence model is selected in the fluid analysis software Fluent, where k is the turbulent kinetic energy and ε is the turbulent dissipation rate. Dynamic layup technology is used to simulate the relative motion between the train and the flange plate 2 of the platform beam 1, thereby calculating the aerodynamic forces generated during train operation. Through simulation analysis and combined with measured data, the following is determined: Figure 3 The typical aerodynamic curve of a high-speed train shows that the aerodynamic forces caused by a high-speed train have strong pulsating characteristics. When the train passes, the air pressure at the front of the train head is positive, then negative, creating a pulsating air pressure acting on the template system. When the rear of the train passes, the pressure load is exactly the opposite: first negative pressure is generated on the template system, then positive pressure, but the pressure amplitude is smaller than that at the front. The positive pressure causes the bottom mold 81 of the template system to tend to float upwards, while the negative pressure causes the bottom mold 81 to tend to sink downwards. That is, the passing of one carriage completes one approximately sinusoidal pulse. Therefore, the aerodynamic frequency of a high-speed train is determined to be a generalized excitation frequency, mainly related to the train speed and the length of one train car. The formula for expressing the aerodynamic disturbance frequency of a high-speed train is: f = aV / L (Hz).

[0046] In the formula:

[0047] a——Correction system, which takes into account the changes in disturbance frequency caused by factors such as changes in train car length and air damping. Generally, a low value of 0.9 and a high value of 1.1 are taken to ensure that the range of train aerodynamic disturbance frequency can be covered.

[0048] L – the length of a train car (m). Since the lead car has the greatest impact, L can be calculated using the length of the lead car.

[0049] V – Train speed (m / s).

[0050] The disturbance frequency of the aerodynamic force of the 200km / h high-speed train is between 1.96-2.39Hz; when the train speed is 160km / h, the frequency range is 1.57-1.91Hz; when the train speed is 120km / h, the frequency range is 1.18-1.43Hz; and when the train speed is 80km / h, the frequency range is 0.78-0.96Hz. In order to avoid resonance, the natural vibration frequency of the formwork system should be away from the range of 0.78-2.39Hz.

[0051] Preferably, the natural vibration frequency of the flange plate 2 formwork system is obtained by establishing a finite element model by using finite element software. Specifically, the finite element model of the formwork system is established by using the finite element software Midas / Civil, the dynamic response of the formwork system under the action of aerodynamic force is investigated, and the dynamic response of the formwork system before and after concrete pouring is calculated. Then, according to the relationship between the vibration of the concrete mechanical parameters and the vibration frequency, amplitude, vibration acceleration and other vibration parameters, the influence of the aerodynamic disturbance on the mechanical properties of the concrete during the concrete curing process is evaluated, and the driving speed recommendation value is proposed from the perspective of ensuring the concrete construction quality and construction safety. The driving speed recommendation value of the present embodiment is 80km / h. Under this driving speed, the formwork system is not prone to resonance, which can cause loosening or falling off of the connection parts, and the quality of the poured concrete and the bonding performance of the new and old concrete joint surface can also be guaranteed.

[0052] Preferably, the construction decomposition includes dividing the construction operation surface into a plurality of spans along the longitudinal direction of the line, and each span includes two bays arranged symmetrically with respect to the line.

[0053] As shown in Figure 4 In order to ensure construction safety and ensure that the work can be smoothly completed in the skylight point, the full-station platform beam 1 is divided into 7 spans and 14 bays in the present embodiment.

[0054] Preferably, the construction decomposition includes dividing the construction operation process into a plurality of construction procedures, and one construction procedure can be completed in one bay within the construction window operation time.

[0055] When the above-mentioned construction of the newly added station platform of a certain operating high-speed rail line is carried out at night, the construction window operation time is 5 hours, and the construction procedures involved mainly include steel pretreatment, steel skeleton binding, installation of the formwork hanger 3, installation of the pouring formwork, and concrete pouring. By decomposing the corresponding construction window operation time of each procedure, the construction window operation time decomposition table of each construction procedure is obtained, as shown in Table 1 below:

[0056] Table 1, construction window operation time decomposition table of each construction procedure

[0057]

[0058] From the above table 1, by combining the construction process with the sub-span and the sub-piece structure, the number of construction workers can be adjusted to complete one construction process of one span / one piece within one skylight operation time, so as to realize the rational use of skylight operation time through the refinement of construction process, realize the high-speed train without stopping operation, reduce the disturbance of cast-in-place concrete by the train, and improve the construction quality.

[0059] Preferably, the construction lofting includes setting a longitudinal control line on the top surface of the platform beam 1 based on the center line of the track. The longitudinal control line is a parallel line of the track center line on the poured platform beam 1. During the process of all construction processes, the platform clearance is detected according to the longitudinal control line, the platform clearance in the construction process is strictly controlled to meet the design requirements, and the safety of train operation is ensured.

[0060] Preferably, the platform clearance detection includes point-by-point detection at equal intervals by using a clearance ruler, and / or infrared equipment is arranged at the longitudinal ends of the platform beam 1 to assist detection. The two are used alternatively or simultaneously.

[0061] Preferably, in step S2, the reinforcing cage binding includes a pretreatment process of rust removal, straightening, reinforcement, etc. of the original platform beam 1 steel bar, so that the formed reinforcing cage can meet the strength requirement. In this embodiment, the construction interval of the platform beam 1 and the flange plate 2 is long, and the platform beam 1 part of the steel bar is exposed for a long time and rusted. In order to further ensure the safety quality of the post-pouring belt and the stability of the connection surface between the flange plate 2 and the platform beam 1, the upper layer steel bar of the original platform beam 1 is chiseled out and reinforced before concrete pouring. Among them, the steel reinforcement includes reinforcing the steel bar corresponding to the surface layer stress steel bar of the flange plate 2 before concrete pouring, rust removal of the original exposed steel bar part according to the requirements, chiseling out a certain distance, for example, 20 cm, along the surface of the platform beam 1, welding with the newly processed main reinforcement, for the area where the structural strength needs to be further strengthened, increasing the main reinforcement by using the way of planting reinforcement, and then binding the lower layer steel bar and the upper layer steel bar into a whole to form a reinforcing cage. It can be understood that the steel bar pretreatment steps such as reinforcement and straightening can be adaptively selected according to the actual situation of the steel bar on site and the strength demand of the reinforcing cage.

[0062] Preferably, in some embodiments, in order to further improve the installation stability of the formwork system, a bench bar is arranged between the reinforcing cage, and a cushion block, for example, 4 / ㎡, is distributed and bound under the reinforcing cage to abut against the pouring formwork 8. The overall rigidity of the reinforcing cage is increased by the arrangement of the bench bar and the cushion block, thereby being conducive to improving the overall structural stability of the formwork system during construction. Among them, the cushion block is preferably a concrete block, which is connected with the reinforcing cage and the formwork system by binding.

[0063] The construction method of the platform flange plate 2 of the newly-added station of the operating line according to the embodiment avoids the disturbance of the aerodynamic force to cause the resonance of the formwork system of the flange plate 2, reduces the adverse effect of the high-speed train passing on the pouring process of the flange plate 2, and decomposes the construction according to the sky window operation time, fully and reasonably uses the sky window operation time to complete the construction operation. Meanwhile, the formwork system is fixed on the platform beam 1 by cantilever, so that the setting of the formwork system and the pouring process will not affect the normal operation of the train, thereby ensuring the construction quality, construction safety and train operation safety. Under the condition of the same manpower allocation, about 15 sky window points can be saved, the construction time in the sky window point and the number of sky window points used are shortened, the construction period is shortened, the labor cost, crane platform cost, instrument use cost and other costs are greatly saved, and the benefit is improved.

[0064] Embodiment 2

[0065] The construction method of the platform flange plate 2 of the newly-added station of the operating line according to the embodiment, on the basis of embodiment 1, further avoids the low construction efficiency caused by the occupation of the unified operation surface between the construction processes, adopts the cantilever cast-in-place and cross parallel flow construction method, and the cross parallel flow construction method includes different construction processes of the longitudinal adjacent flanks that are synchronously performed in the same sky window operation time.

[0066] Taking the platform operation surface divided into 7 spans and 14 flanks in embodiment 1 and the unilateral construction along the line as examples, the operation surface is reasonably expanded and constructed according to the cross parallel flow construction method, and the cross parallel flow construction process of the embodiment is shown in Table 2.

[0067] Table 2, cross parallel flow construction process

[0068]

[0069]

[0070] As shown in the above table, the No. 1 beam steel is straightened, reinforced and pretreated, the adjacent No. 2 beam steel is rusted, which are different construction processes and are not easy to cross each other, and the same is true for other processes, so that the cross parallel flow construction of the platform flange plate 2 is realized.

[0071] Embodiment 3

[0072] The construction method of the platform flange plate 2 of the newly added station of the operating line according to the embodiment, based on the embodiment 1, in combination with the specific structure of the formwork hanger 3, the installation of the formwork hanger 3 is described in step S3. Before the installation of the formwork hanger 3, the setting position of the suspender 31 is laid out on the platform beam 1 surface by using the skylight, and is marked by ink line. The suspender 31 is selected from I-shaped steel, and is arranged at an interval of 1 m. The tail end of the suspender 31 on the platform beam 1 surface is anchored to the platform beam 1 by the form of the pressing plate 32 and the expansion bolt. The number of the pressing plate 32 is increased according to the actual situation to improve the installation stability of the suspender 31. The cantilever end of the suspender 31 extending out of the platform beam 1 is used for installing and fixing the pouring formwork 8.

[0073] Specifically, as shown in Figures 5-7 The pouring formwork 8 includes a bottom form 81, a side form 82 and an end form. The side form 82 is selected from channel steel. The side form 82 is welded to the steel reinforcement framework by the inclined rod 44 on the side close to the platform beam 1, and is welded to the suspender 31 by the L-shaped steel member. The side form 82 is fixed on the side wall of the platform beam 1 by the hooking member, the cable 55 connected by the hooking member and the inclined cable.

[0074] Preferably, in some embodiments, the suspender 31 is installed by matching the platform gauge with the cantilever end of the suspender 31 and used for fixedly connecting the side form 82.

[0075] Preferably, in some other embodiments, since the I-shaped steel suspender 31 is heavy, it is not easy to accurately adjust according to the platform gauge during the installation process. Therefore, in order to ensure the safety of train operation and ensure that the platform gauge meets the requirements, as shown in Figure 8 The embodiment retracts the suspender 31 to the side of the platform beam 1, and parallelly and staggeredly welds the transition rod 33 with relatively small size at the cantilever end of each suspender 31, so as to accurately set the end limit of the suspender 31 after the installation and fixation of the suspender 31, improve the installation accuracy of the formwork hanger 3, and ensure the safety of high-speed train operation.

[0076] In the embodiment, the transition rod 33 is symmetrically arranged on both sides of the web plate of the I-shaped steel suspender 31. The transition rod 33 adopts an angle steel structure member, and is hung and connected with the bottom form 81 by the vertically penetrating pull rod 7.

[0077] The construction method of the platform flange plate 2 of the newly added station of the operating line according to the embodiment, by stably and accurately installing the formwork hanger 3 on the platform beam 1, realizes the cantilever and stable installation of the pouring formwork 8 on the platform beam 1, ensures the structural rigidity of the pouring formwork 8, and further improves the pouring quality of the flange plate 2.

[0078] Embodiment 4

[0079] The construction method of the platform flange plate 2 of the newly-added station of the operating line of the embodiment is based on the embodiment 1, combined with the specific structure of the pouring formwork 8, and the installation instruction of the pouring formwork 8 installation in step S4 is as follows: Before the pouring formwork 8 is installed, the pouring formwork 8 is prefabricated, the pouring formwork 8 prefabrication includes bottom die 81 unit prefabrication, channel steel side die 82 preparation and end die module prefabrication matching the end shape of the flange plate 2, the bottom die 81 unit is formed in at least two specifications by laminating bamboo plywood and arranging square wood, and the side die 82 is made of channel steel; When the pouring formwork 8 is installed, the platform beam 1 limit is strictly controlled to ensure the safety of train operation, and after the bottom die 81 unit is hoisted to the top surface of the platform beam 1, the segment is spliced on the platform beam 1, then pushed into the position below the flange plate 2 and lifted into position, after the bottom die 81 is in position, the side die 82 channel steel is installed in position and fastened, and a plurality of mold pressing members 6 are arranged corresponding to the top surface of the suspender 31 and the bottom surface of the bottom die 81, the mold pressing members 6 are arranged vertically with the suspender 31, the mold pressing members 6 at the top are connected with the steel reinforcement frame by binding, and the mold pressing members 6 corresponding in up and down are connected by the pull rod 7.

[0080] Specifically, the mold pressing member 6 of the embodiment includes two parallel pressure rods 61, the pressure rod 61 includes a steel pipe, the pull rod 7 passes through the passing gap 62 between the two steel pipes, the pull rod 7 passes through the two sides of the pouring space and is connected with the pressure connecting piece 71 respectively, the pressure connecting piece 71 abuts against the mold pressing member 6, the hanging installation of the bottom die 81 on the formwork suspender 3 is realized, the steel pipe of the mold pressing member 6 can also be adjusted to other cross-section form rod-shaped steel members according to actual conditions, the mold pressing member 6 with the steel pipe structure has the advantages of lighter weight, lower carrying difficulty, shorter formwork system installation time, and in order to improve the integrity of the formwork system, the structure of the formwork system is stable during the concrete pouring process, and the pressure rod 61 is arranged along the longitudinal length of the line or spliced and connected to be consistent with the longitudinal length of the operation surface to be constructed.

[0081] Preferably, a plurality of pull rods 7 are arranged at intervals along the passing gap 62, and a plurality of mold pressing members 6 are arranged at intervals along the longitudinal direction of the suspender 31, which forms a distributed multi-point fixing of the pouring space, which is beneficial to improve the overall rigidity and installation stability of the formwork system.

[0082] Specifically, the pull rod 7 is preferably a threaded rod, and the pressure connecting piece 71 is a butterfly buckle, a straight pipe short section, a support rod short section or other components with a certain length and convenient for disassembly and assembly with the threaded rod.

[0083] The construction method of the station platform flange plate 2 of the operating line newly added station of the embodiment, through the unit of the bottom die 81 prefabricated in advance, reduces the preparation time of the flange plate 2 formwork system on site, maximally reduces the occupation of the preparation and installation of the pouring formwork 8 to the skylight operation time, shortens the overall operation time, at the same time, through the cooperation and connection of the press mold component 6, the pull rod 7 and the pressure joint 71, realizes the stable hanging installation of the pouring formwork 8 at the cantilever end of the suspender 31, avoids the uncontrollable vibration and floating of the pouring formwork 8 under the action of the pneumatic force of the train passing, is favorable to improve the construction quality, after the installation of the pouring formwork 8 is completed, according to the conventional concrete pouring process, carries out the concrete pouring, maintenance and demolding cleaning, according to the actual situation, the turnover of the pouring formwork 8.

[0084] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method of a station platform flange plate of a newly added station of an operating line, characterized by, Comprising the following steps: S1, construction preparation, the construction preparation includes construction decomposition, construction lofting and driving speed determination; the driving speed meets: the self-vibration frequency of the formwork system composed of the formwork hanger (3) and the pouring formwork (8) and the disturbance frequency range of train aerodynamic force do not intersect, the disturbance frequency of train aerodynamic force is obtained by numerical simulation software analysis and calculation, and the self-vibration frequency of the formwork system is obtained by establishing a finite element model by finite element software analysis. S2, steel reinforcement framework binding, the steel reinforcement framework is fixedly connected with the platform beam (1) steel reinforcement; S3, formwork hanger (3) installation, one end of the formwork hanger (3) is fixed on the top surface of the platform beam (1), and the other end extends out of the platform beam (1) to form a cantilever section; S4, pouring formwork (8) installation, the pouring formwork (8) includes a bottom die (81), a side die (82) and an end die, the bottom die (81) is hung and connected with the cantilever section through a pull rod (7), the side die (82) is fixedly connected with the cantilever section, and the end die is fixedly connected with the steel reinforcement framework to form a pouring space; S5, concrete pouring.

2. The method for constructing a platform flange plate of a newly added station of an operating line according to claim 1, characterized in that, In step S1, the construction decomposition includes: dividing the construction operation surface into several spans along the longitudinal direction of the line, each span including two frames symmetrically arranged relative to the line, dividing the construction operation process into several construction procedures, and one construction procedure can be completed within one window operation time; the construction lofting includes setting a longitudinal control line on the top surface of the platform beam (1) with the line center line as the reference.

3. The method of claim 2, wherein the method further comprises: after the step of installing the platform, installing a platform wing plate on the platform. 3 During the performance of all the construction procedures, platform clearance detection is performed according to the longitudinal control line, and the platform clearance detection includes point-by-point detection at equal intervals by using a clearance ruler and / or auxiliary detection by infrared equipment arranged at the longitudinal ends of the platform beam (1).

4. The method for constructing a platform flange plate of a newly added station of an operating line according to claim 1, characterized in that, Step S2 includes: chiseling out and downgrading reinforcement on the upper layer of the platform beam (1), binding the reinforcement to form a steel reinforcement framework adapted to the structural features of the flange plate (2), arranging a bench bar between the steel reinforcement framework, and distributing and binding cushion blocks for abutting against the pouring formwork (8) below the steel reinforcement framework.

5. The method for constructing a platform flange plate of a newly added station of an operating line according to claim 1, characterized in that, Step S3 specifically includes the following steps: S3.1, a plurality of hangers (31) are arranged at intervals on the top surface of the platform beam (1), one end of the hanger (31) is located on the top surface of the platform beam (1), and the other end extends out of the platform beam (1); S3.2, a plurality of pressing plates (32) are arranged on the hangers (31), and the hangers (31) are fixed by anchoring the pressing plates (32) on the top surface of the platform beam (1).

6. The method of claim 5, wherein the method further comprises: Step S3.1 specifically includes: matching the platform clearance by the cantilever end of the hanger (31) and being used for fixedly connecting the side die (82), or, connecting transition rods (33) in parallel at the cantilever end of each hanger (31), and matching the platform clearance by the end of the transition rod (33) and being used for fixedly connecting the side die (82).

7. The construction method for the platform flange plate of a newly added station on an operating line as described in claim 5, characterized in that, Step S4 specifically includes the following steps: S4.1, hoisting the bottom die (81) to the top surface of the platform beam (1), pushing into the lower part of the flange plate (2) and then lifting into position; S4.2 A tie rod (7) is provided between adjacent hangers (31) and passes through the steel reinforcement skeleton and the bottom formwork (81). The top and bottom of the tie rod (7) are respectively connected to the pressing mold component (6). The pressing mold component (6) located at the top overlaps the top surface of at least two hangers (31) along the longitudinal direction of the line. S4.

3. The side formwork (82) is fixedly connected to the cantilever end of the suspender (31), and the side formwork (82) near the platform beam (1) is connected to the steel reinforcement frame by the diagonal bar (4). The bottom of the side formwork (82) is diagonally fixed to the side wall of the platform beam (1) by the cable (5).

8. The construction method for the platform flange plate of a newly added station on an operating line as described in claim 7, characterized in that, The molding component (6) includes two parallel pressure rods (61), which are arranged or spliced ​​along the longitudinal direction of the line, forming a through gap (62) between the two pressure rods (61). The pull rod (7) passes through the through gap (62), and a number of pull rods (7) are arranged at intervals along the through gap (62). A number of molding components (6) are arranged at intervals along the longitudinal direction of the hanging rod (31). The pull rod (7) is detachably connected to the pressing member (71) on both sides of the casting space. The pressing member (71) is used to abut against the molding component (6).

9. A construction method for the platform flange of a newly added station on an operating line as described in claim 2, characterized in that, In step S5, the concrete pouring adopts a cantilever casting-in-place and span-by-span parallel flow operation method. The span-by-span parallel flow operation method includes different construction procedures carried out simultaneously on adjacent sections along the longitudinal direction of the line within the same skylight operation time. The construction procedures include steel bar pretreatment, steel bar cage binding, formwork hanger (3) installation, pouring formwork installation, and concrete pouring.

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