CN105970822A - A 50m double-width upward mobile formwork and its corresponding beam-making construction method - Google Patents

Abstract

The invention relates to a 50m double-width upward moving type movable formwork and a corresponding beam manufacturing construction method thereof, belonging to the technical field of methods or equipment special for erecting or assembling bridges. The lower hanging beam of the die carrier is provided with a segmented beam, and a flange plate of a pouring template is fixedly connected to the segmented beam; a pouring template is fixedly connected to the lower hanging beam; when the segmented beam is in a closed state, the front end of the flange plate is unfolded; the contraction of the flange plates when the segmented beam is in the deployed state. The method comprises the steps of (1) carrying out die carrier assembly; (2) pre-pressing; (3) carrying out beam manufacturing construction on the first span beam; (4) the constructed pier position is made way; (5) carrying out primary stress system conversion; (6) moving the via; (7) carrying out secondary stress system conversion; (8) and constructing the second span beam. The invention constructs the double-width bridge deck with the interval in an integral construction mode, can effectively solve the problem caused by the undersized interval of the bridge deck, constructs in the integral construction mode, improves the construction efficiency and accelerates the construction process.

Description

A 50m double-width upward mobile formwork and its corresponding beam-making construction method

technical field

The invention relates to a 50m double-width upward moving formwork and a corresponding beam-making construction method, belonging to the technical field of methods or equipment specially used for erecting or assembling bridges.

Background technique

Many problems arise when performing on-site concrete casting of bridge construction for the entire bridge span over deep valleys, over water crossings with steep slopes, over roads or railways or in areas of environmental protection. The movable formwork system (MSS) for bridge construction is an advanced in-situ pouring construction method for bridges. It provides support surfaces and working surfaces for beam construction and avoids the erection of supports. Its construction features are not affected by the construction site, The height of the pier body is limited, and it can cross obstacles such as rivers and valleys; no foundation treatment is required, and supports are erected span by span, and the constructed cap and pier body can be used as support points to move forward to the next beam bridge position to continue construction , The construction speed is fast; the mobile formwork is a large-scale construction equipment, and there is no need to repeatedly dismantle and erect during the construction process, and the construction is safe and reliable. It can provide advantages over traditional formwork, including less disturbance to the environment, providing a more centralized work area for superstructure assembly, and improving worker safety while improving the building environment.

The MSS consists of a support structure spanning between two piers, from which the formwork is supported or suspended. The internal formwork (core form) is collapsible and runs on a rail system for repositioning to the next bridge span. The outer formwork of the system can be opened sufficiently to allow the outer formwork to pass around the pier during travel. After travel, the outer formwork is closed again, and after being set to the correct alignment, reinforcement placement can begin.

MSS can be divided into two types, including underlane or underslung and overlane or overhead. A descending MSS has two parallel beams that support the formwork. An ascending MSS has one or two girders from which the formwork is suspended.

The choice of which type to use depends on site conditions such as height restrictions, deck type (eg, single-cable plane, double-cable plane, double-T) and pier height.

Self-propelled mobile formwork (SL-MSS) was used to deal with the difficulties associated with piers support brackets on water and on higher piers. The system is able to transport and install the pier support brackets forward without the need for any separate cranes. SL-MSS has been successfully used in the construction of several large bridge projects all over the world and has since gained popularity due to its cost and operational efficiency.

Although MSS has many advantages, the current MSS also has more existing problems. These include the need for a long construction period, the inability to convey the entire reinforcement cage at the same time or all at once, the need for several block-outs in the superstructure, the need to support the hangers of the formwork through the superstructure deck, the need for Other equipment necessary for repositioning the support, and its operation is complex and labor intensive.

In addition, MSS can only meet the requirements of single beam construction or when the distance between the left and right beams is relatively large, the left and right beams should be constructed separately. When the distance between the left and right beams is very small, the traditional single-width upward and downward mobile formwork cannot meet the needs of the mobile formwork opening and passing holes. Therefore, innovative research must be carried out on the traditional mobile formwork construction method to meet the project actual needs.

Contents of the invention

The technical problem to be solved by the present invention is to propose a double-width upward mobile formwork spanning the left and right beams of the bridge with a width of 50m and its corresponding beam-making construction method. It can meet the requirements of bridge construction under small spacing, and avoids problems such as inability to open mold holes due to too small spacing between left and right beams.

The first technical solution proposed by the present invention in order to solve the above-mentioned technical problems is: a 50m double-width upward mobile formwork, including a main body that is used to expand from the bottom to remove the formwork of the bridge girder body or close from the bottom to pour the bridge girder body The construction mold, the main beam supported on the middle leg of the bridge beam body for carrying the main body construction mold and driving the main body construction mold to move longitudinally along the bridge beam body, and the main beam supported on the bridge beam body The nose bridge on the front outrigger is used to guide the main girder and is supported on the poured bridge girder body to assist the main girder to move longitudinally along the bridge girder body and to adjust laterally along the bridge girder body The rear longitudinal movement; the main body construction mold is suspended on the main beam, the nose bridge is installed on the front end of the main beam, and the rear longitudinal movement is installed on the rear end of the main beam; the main body The construction mold includes an upper beam horizontally inserted on the main beam along the transverse direction of the main beam, a lower hanging beam suspended on the upper beam, fixed on the lower hanging beam and used for pouring bridge beams The pouring template and the control mechanism for controlling the opening or closing of the lower hanging beam from the bottom; the upper beams are provided with multiple pieces and arranged at equal intervals along the longitudinal direction of the main beam, and each upper beam is correspondingly hung with a pair of The lower hanging beam, the lower hanging beam is suspended from the beam side of the upper beam at both ends of the upper beam; the pouring formwork is suspended on the upper beam through a boom, and the bottom of the lower hanging beam Segmented beams are all provided, and the flange plates of the pouring formwork are correspondingly fixed on each segmented beam; the control mechanism is provided between the upper beam and the lower hanging beam to drive the lower The hanging beam moves laterally along the upper cross beam to separate and unfold the segmented beam from the bottom, the first hydraulic cylinder for adjusting the lateral displacement of the hanging beam sliding seat along the main beam, A second hydraulic cylinder for controlling the expansion or closure of the segmented beams and a lap joint for overlapping the separated parts of the segmented beams;

A pair of pouring templates for pouring double-width bridge beams arranged side by side on the lower hanging beam are fixedly connected to the lower hanging beam;

When the segmented beam is in the closed state, the front end of the flange plate is supported and deployed by the third hydraulic cylinder;

When the segmented beam is in the unfolded state, the front end of the flange plate is driven and contracted by the third hydraulic oil cylinder.

The improvement of the above technical solution is: the bottom of the main beam is provided with a trolley for pushing the main beam to move longitudinally, and a trolley for pushing the main beam longitudinally toward the front support is provided between the trolley and the main beam. The first longitudinal hydraulic cylinder pushed in the direction of the legs; the first longitudinal hydraulic cylinder is installed on the trolley, and the output end of the first longitudinal hydraulic cylinder is slidably connected to the main beam through the first slider On the first sliding rail at the bottom; between the first sliding block and the first sliding rail, there is a device for adjusting the first sliding block and the first sliding block during the output process of the first longitudinal hydraulic cylinder The slide rails are used for mutual positioning of the first positioning member.

The improvement of the above technical solution is: a second longitudinal hydraulic cylinder for pushing the rear longitudinal movement along the longitudinal direction of the main girder toward the direction of the middle leg is provided between the rear longitudinal movement and the poured bridge girder; The second longitudinal hydraulic cylinder is connected to the second slide rail on the upper surface of the poured bridge girder through the second slider, and the output end of the second longitudinal hydraulic cylinder is connected to the bottom of the rear longitudinal movement On the slide seat, the bottom slide seat is slidably connected to the second slide rail; there is a device between the second slide block and the second slide rail for outputting the second longitudinal hydraulic cylinder A second positioning member for mutually positioning the second sliding block and the second sliding rail.

The improvement of the above technical solution is: there is a first lateral movement hydraulic pressure for adjusting the displacement of the main beam along the radial direction of the main beam to adjust the orientation of the main beam between the rear longitudinal shift and the main beam. cylinder.

The improvement of the above technical solution is: the main body construction mold contains 14 sets of lower hanging beams in total.

The beneficial effects of the first technical solution of the present invention are:

1) The 50m double-width upward moving formwork of the present invention allows the 50m double-width upward moving formwork to move longitudinally through the hole as a whole through segmental beams, flange plates and oil cylinders that cooperate with these components.

2) The lateral movement oil cylinder matched with the rear vertical movement and the trolley pushes the 50m double-width upward mobile formwork to move laterally, realizing the adjustment of the centerline position of the 50m double-width upward mobile formwork, ensuring the 50m double-width upward mobile formwork system The beam alignment can be consistent with the design alignment.

3) The design of the longitudinal movement track after moving the formwork makes the vertical slope of the rear fulcrum, middle fulcrum and front fulcrum consistent throughout the longitudinal movement, avoiding local concentrated force on the main beam and nose bridge, and ensuring the construction safety of the mobile formwork.

4) The 50m double-width upward mobile formwork of the present invention falls, the formwork is folded, the mold is opened, the formwork is moved vertically through the hole as a whole, and the mold clamping and jacking are all automatically controlled by the hydraulic system, working synchronously, and the construction operation is simple, convenient and fast ,Safe and reliable.

5) In the present invention, the rear longitudinal movement and the small and medium trolleys are all designed with traverse beams and traverse oil cylinders. The movable formwork can move laterally and adjust the attitude so that the axis of the movable formwork is always consistent with the design.

6) After the mobile formwork of the present invention is dropped, it bears the dead weight of the mobile formwork at three points: the rear longitudinal movement, the middle trolley, and the front leg. The overall passage of the mobile formwork; the rear longitudinal movement is designed with a longitudinal movement track, the rear longitudinal movement and the mobile formwork move forward along the track, the trolley and the front legs are fixed, and the mobile formwork moves along the trolley, The slideway on the front outrigger slides forward longitudinally; the mobile formwork can meet the simultaneous beam construction of the double-width bridge girder body on the left and right sides, and the overall formwork is dropped and longitudinally moved through the hole.

The second technical scheme proposed by the present invention in order to solve the above-mentioned technical problems is a method for beam-making construction using a 50m double-width upward moving formwork. The construction steps of the method are as follows:

(1) After completing the pier body construction of the assembly area of the 50m double-width upward mobile formwork, carry out the assembling work of the 50m double-width upward mobile formwork at the current construction pier position;

(2) adopt sandbag, water bag combination mode to carry out the preloading work of described 50m double width upward type mobile formwork;

(3) Carry out beam making construction to the first span beam;

(4) After the initial tensioning of the first span beam is completed, adjust the 50m double-width upward moving formwork to let out the constructed pier;

(5) Carry out the stress system conversion work for the first time of described 50m double-width upward moving formwork;

(6) The 50m double-width upward mobile formwork is integrally moved through the hole to the next construction pier position;

(7) Carry out the second stress system conversion work of the 50m double-width upward moving formwork;

(8) After the second stress system conversion work is completed, the second span beam will be constructed.

The improvement of the above technical solution is: the process of assembling the 50m double-width upward mobile formwork in step 1) is as follows, after the construction of the pier body in the assembly area of the 50m double-width upward mobile formwork is completed, by erecting a temporary Assembling the main girder, nose bridge, and upper beam of the 50m double-width upward mobile formwork for supporting trestle bridge and temporary steel pipe pier, and installing the front and middle outriggers; after the installation of the front and middle outriggers is completed, dismantle Temporary steel pipe support piers, the installation of the lower hanging beams and templates of the 50m double-width upward mobile formwork, and the installation of mobile gantry cranes and distributing machines at the same time, to complete the assembly of the 50m double-width upward mobile formwork.

The improvement of the above-mentioned technical solution is: in step 4), the boom of the 50m double-width upward mobile formwork is removed, and the left and right sides of the flange plate folding oil cylinders of the 50m double-width upward mobile formwork shrink synchronously, and the 50m The flange plate formwork of the double-width upward mobile formwork is folded in place, and the lower hanging beam and pouring formwork are folded in place through the hydraulic cylinder to complete the secondary folding construction of the construction formwork. The hanging beams and formwork are opened horizontally to get out of the way of the constructed piers.

The beneficial effects of the second technical solution of the present invention are: the present invention adopts a specific construction method to adapt to the beam-making construction method of the 50m double-width upward mobile formwork, and the conventional method has been unable to do so because the width of the 50m double-width upward mobile formwork is too large. Using this formwork, the pre-compression test and the conversion of the secondary stress system are used to make a smooth transition to the 50m double-width upward mobile formwork.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is a schematic diagram of the overall structure of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the main construction mold of the embodiment of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of the rear longitudinal movement of the embodiment of the present invention.

Fig. 4 is a structural schematic diagram of a trolley in an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional structure diagram of the main body construction mold in the first state according to the embodiment of the present invention.

Fig. 6 is a schematic cross-sectional structure diagram of the main body construction mold in the second state according to the embodiment of the present invention.

Fig. 7 is a schematic cross-sectional structure diagram of the main body construction mold in the third state according to the embodiment of the present invention.

Fig. 8 is a schematic cross-sectional structure diagram of the main body construction mold in the fourth state according to the embodiment of the present invention.

Bridge beam body 1, main construction mold 2, middle outrigger 3, main girder 4, front outrigger 5, nose bridge 6, rear longitudinal shift 7, medium trolley 8, upper beam 201, lower hanging beam 202, pouring template 203, Segment beam 204, flange plate 205, hanging beam sliding seat 206, first hydraulic cylinder 207, second hydraulic cylinder 208, lap joint 210, third hydraulic cylinder 209, first longitudinal hydraulic cylinder 801, first slider 802 , the first slide rail 803 , the second traverse cylinder 804 , the second slide rail 701 , and the first traverse hydraulic cylinder 702 .

detailed description

Example

This implementation case is a construction method of in-situ girders for a large-scale double-width four-track railway bridge in a certain city. The total length of the L bridge is 3366.30m, connecting the south bank of the O River and L Island, of which the 2450m section across the O River, and the 50m double-width four-line simply supported box girders are all located in the O River. The width of the 50m simply supported box girder is 10.64m, the distance between the left and right flange plates 205 is only 2cm, and the distance between the piers is only 3.4m. Neither the traditional single-width upward type nor the downward type mobile formwork can meet the construction needs. Therefore, the 50m double width of this embodiment is adopted. The upward mobile formwork construction method is currently the largest double-width upward mobile formwork construction method in China. The bridge girder body 1 of this embodiment is a box girder of a bridge.

A 50m double-width upward mobile formwork in this embodiment, as shown in Figures 1 and 2, includes a main construction mold 2 for unfolding from the bottom to remove the formwork of the bridge girder body 1 or closing from the bottom to pour the bridge girder body , the main beam 4 supported on the middle leg 3 of the bridge girder body 1 for carrying the main body construction mold 2 and driving the main body construction mold 2 to move longitudinally along the bridge girder body 1, and supported on the front leg 5 of the bridge girder body 1 The nose bridge 6 for guiding the main girder 4 and the rear longitudinal movement 7 supported on the poured bridge girder 1 for assisting the longitudinal movement of the main girder 4 along the bridge girder 1 and the horizontal adjustment along the bridge girder 1; The main body construction mold 2 is suspended on the main beam 4, the nose bridge 6 is installed on the front end of the main beam 4, and the rear longitudinal movement 7 is installed on the rear end of the main beam 4; The upper beam 201 on the main beam 4, the lower hanging beam 202 suspended on the upper beam 201, the pouring formwork 203 fixed on the lower hanging beam 202 and used for pouring the bridge beam body 1, and the lower hanging beam 202 for controlling and The control mechanism that the outer formwork is opened or closed from the bottom; the upper beam 201 is provided with multiple pieces and arranged at equal intervals along the longitudinal direction of the main beam 4, and each upper beam 201 is correspondingly hung with a pair of lower hanging beams 202, and the lower hanging beams 202 are connected from the upper The beam side of the beam 201 is suspended from the two ends of the upper beam 201; the pouring formwork 203 is suspended on the upper beam 201 through a suspender, and the bottom of the lower hanging beam 202 is provided with a segmented beam 204, and the flange plate 205 of the pouring formwork 203 corresponds to the fixed Connected to each segmental beam 204; the control mechanism includes a hanger arranged between the upper beam 201 and the lower hanging beam 202 to drive the lower hanging beam 202 to move laterally along the upper beam 201 so that the segmental beam 204 is separated from the bottom and unfolded The beam slide 206, the first hydraulic cylinder 207 for adjusting the lateral displacement of the hanging beam slide 206 along the main beam 4, the second hydraulic cylinder 208 for controlling the expansion or closing of the segment beam 204, and the second hydraulic cylinder 208 for the segment beam 204 The overlapping joints 210 between the separated parts;

The lower hanging beam 202 is fixedly connected with a pair of pouring templates 203 arranged side by side on the lower hanging beam 202 for pouring the double width bridge beam body 1;

When the segmented beam 204 is in the closed state, the front end of the flange plate 205 is supported and deployed by the third hydraulic cylinder 209;

When the segmented beam 204 is in the unfolded state, the front end of the flange plate 205 is driven and contracted by the third hydraulic cylinder 209 .

The bottom of the main beam 4 of the present embodiment is provided with a trolley 8 for pushing the longitudinal movement of the main beam 4, as shown in Figure 4, between the trolley 8 and the main beam 4 is provided with a supporting leg for moving the main beam 4 longitudinally forward. The first longitudinal hydraulic cylinder 801 pushed in 5 directions; the first longitudinal hydraulic cylinder 801 is installed on the trolley 8, and the output end of the first longitudinal hydraulic cylinder 801 is slidably connected to the bottom of the main beam 4 through the first slider 802 On the first sliding rail 803; between the first sliding block 802 and the first sliding rail 803, there is a mutual positioning mechanism for the first sliding block 802 and the first sliding rail 803 during the output process of the first vertical displacement hydraulic cylinder 801. The first positioning piece.

The trolley 8 in this embodiment is also provided with a second hydraulic cylinder 804 on the traversing beam for adjusting the construction curvature.

As shown in Figure 3, a second longitudinal hydraulic cylinder for pushing the rear longitudinal shift 7 along the longitudinal direction of the main girder 4 toward the middle leg 3 is provided between the rear longitudinal shift 7 of this embodiment and the poured bridge girder body 1 The second longitudinal hydraulic cylinder is connected to the second slide rail 701 on the upper surface of the poured bridge beam body 1 through the second slider, and the output end of the second longitudinal hydraulic cylinder is connected to the bottom sliding seat of the rear vertical movement 7 , the bottom sliding seat is slidably connected to the second slide rail 701; there is a set between the second slide block and the second slide rail 701 for adjusting the second slide block and the second slide rail 701 during the output process of the second longitudinal hydraulic cylinder. A second locator for mutual positioning.

In this embodiment, a first traverse hydraulic cylinder 702 for adjusting the radial displacement of the main beam 4 along the radial direction of the main beam 4 is provided between the rear longitudinal shifter 7 and the main beam 4 to adjust the orientation of the main beam 4 .

The main body construction mold 2 of this embodiment contains 14 groups of lower hanging beams 202 in total. The left and right side flange plates 205, the lower hanging beam 202, and the upper beam 201 are respectively provided with 14 groups of hydraulic oil cylinders, totaling 84 groups, to meet the needs of mold opening and lateral movement of the mobile formwork template.

In this embodiment, a method for beam-making construction using a 50m double-width upward mobile formwork, the construction steps are as follows:

(1) After completing the pier construction in the assembly area of the 50m double-width upward mobile formwork, assemble the 50m double-width upward mobile formwork at the current construction pier;

(2) The combination of sandbags and water bags is used to pre-press the 50m double-width upward mobile formwork;

(3) Carry out beam-making construction on the first span beam; after adjusting the center line and elevation of the formwork, carry out the beam-making construction of the first span of the mobile formwork, and carry out assembly of the trolley 8 and rear longitudinal shift 7 systems on the poured beam surface;

(4) After the initial tensioning of the first span beam is completed, adjust the 50m double-width upward mobile formwork to give way to the pier; The oil cylinder shrinks and drops the formwork, removes the formwork suspenders, the flange plate 205 formwork folding cylinder completes the first folding of the formwork, the second hydraulic cylinder 208 completes the second folding of the lower hanging beam 202 and the formwork, and the upper beam 201 traverses the cylinder to open laterally. Complete the mold opening of the mobile formwork, and give way to the pier that has been constructed;

(5) Carry out the first stress system conversion work of the 50m double-width upward mobile formwork; after installing the mobile formwork, move 7 longitudinal tracks, and the rear outrigger and middle outrigger 3 oil cylinders continue to shrink, so that the mobile formwork as a whole Fall on the rear longitudinal shift 7 and the trolley 8 to complete the conversion of the force system, adjust the attitude of the mobile formwork through the rear longitudinal movement 7 and the lateral movement of the trolley 8, and prepare the mobile formwork for longitudinal movement through the hole;

(6) Move the 50m double-width upward mobile formwork as a whole through the hole to the next construction pier; after the final stretching and grouting of the bridge beam body 1 is completed, the rear longitudinal movement 7, and the 8 jacking cylinders of the small and medium-sized cars are pushed synchronously, Move the formwork through the hole to the next construction pier;

(7) Carry out the second force system conversion work of the 50m double-width upward mobile formwork; the middle outrigger 3 and the rear outrigger oil cylinder are jacked up synchronously, and the mobile formwork is separated and moved longitudinally 7 and small and medium trolleys 8 to complete the second The secondary stress system is converted, the upper beam 201 is moved horizontally, the cylinder is retracted, the second hydraulic cylinder 208 is pushed, and the formwork folding cylinder of the flange plate 205 is pushed, the construction of the mobile formwork is completed, and the formwork hanger is installed;

(8) After the second stress system conversion work is completed, the second span beam is constructed; the rear outrigger and middle outrigger 3 are simultaneously lifted to the design elevation, and the front outrigger 5 is moved forward to the next pier, After adjusting the center line and elevation of the formwork, the second span girder beam construction will be carried out.

In the step 1) of the present embodiment, the process of assembling the 50m double-width upward mobile formwork is as follows. Assemble the main beam 4, nose bridge 6, and upper beam 201 of the 50m double-width upward mobile formwork, and install the front outrigger 5 and middle outrigger 3; after the installation of the front and middle outrigger 3 is completed, remove the temporary steel pipe support pier, install the lower hanging beam 202 and formwork of the 50m double-width upward mobile formwork, and install the mobile gantry crane and the distributing machine at the same time to complete the assembly of the 50m double-width upward mobile formwork.

In step 4) of this embodiment, the suspenders of the 50m double-width upward mobile formwork are removed, and the left and right sides of the flange plate 205 of the 50m double-width upward mobile formwork shrink synchronously respectively, and the wings of the 50m double-width upward mobile formwork The formwork of the edge plate 205 is folded in place, the lower hanging beam 202 and the pouring formwork 203 are folded in place through the hydraulic cylinder, and the secondary folding construction of the construction formwork is completed, and the oil cylinder on the upper beam 201 is pushed synchronously and symmetrically to drive the lower hanging beam 202 and the pouring formwork. The formwork is opened horizontally to get out of the way of the pier that has been constructed.

The main body construction mold 2 of this embodiment is shown in Figure 5-8, the first state is the state when the construction mold is ready to pour the box girder, the second state is the state that the main body construction mold 2 is ready to open the mold after pouring is completed, and the third state is The state is the mold opening state of the main construction mold 2 , and the fourth state is the mold passing state of the main construction mold 2 . The above state diagrams are all the cross-sectional diagrams of the main body construction mold 2.

The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent replacements fall within the scope of protection required by the present invention.

Claims (8)

1. A 50m double-width upward mobile formwork, comprising a main body construction mold for launching from the bottom to remove formwork for the bridge girder body or closing from the bottom to pour the bridge girder body, and middle legs supported on the bridge girder body The main girder used to carry the main body construction mold and drive the main body construction mold to move longitudinally along the bridge girder body, and is supported on the front leg of the bridge girder body to guide the main girder The nose bridge and the rear longitudinal movement supported on the poured bridge beam body are used to assist the main girder to move longitudinally along the bridge beam body and to adjust horizontally along the bridge beam body; the main construction mold is suspended from the On the main beam, the nose bridge is installed on the front end of the main beam, and the rear longitudinal movement is installed on the rear end of the main beam; The upper beam on the main beam, the lower hanging beam suspended on the upper beam, the pouring template fixed on the lower hanging beam and used for pouring the bridge beam body, and the pouring formwork for controlling the lower hanging beam from the bottom The control mechanism for unfolding or closing; the upper beams are provided with multiple pieces and arranged at equal intervals along the longitudinal direction of the main beam, and each upper beam is correspondingly hung with a pair of the lower hanging beams, and the lower hanging beams are connected from the The beam side of the upper beam is suspended at both ends of the upper beam; the pouring formwork is suspended on the upper beam through suspenders, and it is characterized in that: the bottom of the lower hanging beam is provided with segmented beams, and the pouring The flange plates of the formwork are correspondingly fixed on each segmental beam; the control mechanism is arranged between the upper beam and the lower hanging beam to drive the lower hanging beam to move laterally along the upper beam to A hanging beam sliding seat that separates and unfolds the segmented beam from the bottom, a first hydraulic cylinder for adjusting the displacement of the hanging beam sliding seat along the lateral direction of the main beam, and controlling the expansion or expansion of the segmented beam a closed second hydraulic cylinder and a lap joint for overlapping the separated parts of the segmented beam; A pair of pouring templates for pouring double-width bridge girders arranged side by side on the lower hanging beam are fixedly connected to the lower hanging beam; When the segmented beam is in the closed state, the front end of the flange plate is supported and deployed by the third hydraulic cylinder; When the segmented beam is in the unfolded state, the front end of the flange plate is driven and contracted by the third hydraulic oil cylinder. 2. The 50m double-width upward mobile formwork according to claim 1, characterized in that: the bottom of the main girder is provided with a trolley for pushing the main girder to move longitudinally, and a trolley is arranged between the trolley and the main girder. There is a first longitudinal hydraulic cylinder for pushing the main beam longitudinally toward the front leg; the first longitudinal hydraulic cylinder is installed on the trolley, and the first longitudinal hydraulic cylinder The output end is slidably connected to the first slide rail at the bottom of the main beam through the first slide block; there is a device for outputting the first longitudinal hydraulic cylinder between the first slide block and the first slide rail. During the process, the first positioning member is used to position the first slider and the first slide rail. 3. The 50m double-width upward mobile formwork according to claim 1, characterized in that: between the rear longitudinal shift and the poured bridge girder, there is a device for moving the rear longitudinal shift along the longitudinal direction of the main girder toward the The second longitudinal movement hydraulic cylinder pushed in the direction of the middle leg; the second longitudinal movement hydraulic cylinder is connected to the second slide rail on the upper surface of the cast bridge girder through the second slider, and the second longitudinal movement The output end of the hydraulic cylinder is connected to the bottom sliding seat of the rear longitudinal movement, and the bottom sliding seat is slidably connected to the second sliding rail; There is a second positioning member for mutually positioning the second sliding block and the second sliding rail during the output process of the second longitudinal hydraulic cylinder. 4. The 50m double-width upward mobile formwork according to claim 1, characterized in that: between the rear longitudinal shift and the main beam, there is a set for adjusting the displacement of the main beam along the radial direction of the main beam To adjust the orientation of the main beam to the first traversing hydraulic cylinder. 5. The 50m double-width upward moving formwork according to claim 1, characterized in that: the main body construction mold contains 14 sets of lower hanging beams in total. 6. A method for beam-making construction using a 50m double-width upward mobile formwork, characterized in that the construction steps are as follows: (1) After completing the pier construction in the assembly area of the 50m double-width upward mobile formwork, the assembly work of the 50m double-width upward mobile formwork is carried out at the current construction pier; (2) The pre-compression of the 50m double-width upward mobile formwork is carried out by means of a combination of sandbags and water bags; (3) Carry out beam-making construction on the first span beam; (4) After the initial tensioning of the first span beam is completed, adjust the 50m double-width upward mobile formwork to give way to the constructed pier; (5) Carry out the first stress system conversion of the 50m double-width upward mobile formwork; (6) Move the 50m double-width upward mobile formwork as a whole through the hole to the next construction pier; (7) Carry out the second stress system conversion work of described 50m double-width upward moving formwork; (8) After the second stress system conversion work is completed, the second span beam will be constructed. 7. The method for beam-making construction using a 50m double-width upward mobile formwork according to claim 6, characterized in that: in step 1), the process of assembling the 50m double-width upward mobile formwork is as follows. After the construction of the pier body in the assembling area of the 50m double-width upward mobile formwork is completed, the main girder, the nose bridge and the upper beam of the 50m double-width upward mobile formwork are assembled by setting up a temporary trestle bridge and a temporary steel pipe pier, and Install the front and middle outriggers; after the installation of the front and middle outriggers is completed, remove the temporary steel pipe pier, install the lower hanging beams and formwork of the 50m double-width upward mobile formwork, and install the mobile formwork at the same time. A gantry crane and a distributing machine are used to complete the assembly of the 50m double-width upward mobile formwork. 8. The method for beam-making construction using a 50m double-width upward moving formwork according to claim 6, characterized in that: in step 4), the booms of the 50m double-width upward moving formwork are removed, and the 50m double-width upward moving formwork The left and right sides of the flange plate folding oil cylinder of the upward mobile formwork are respectively contracted synchronously, and the flange plate formwork of the 50m double-width upward mobile formwork is folded in place, and the lower hanging beam and pouring formwork are folded in place through the hydraulic cylinder to complete the construction The secondary folding construction of the formwork is synchronously and symmetrically pushed by the oil cylinder on the upper beam, driving the lower hanging beam and the formwork to open horizontally, and get out of the way of the constructed pier.