A synchronous construction method for the main gutter, side gutter and filling of a tunnel invert

Abstract

The present invention discloses a synchronous construction method for the main gutter, side gutters and filling of a tunnel invert, which includes the following steps: Step S1, position and install the main gutter box form along the design path of the main drainage gutter extending longitudinally along the tunnel center. The main gutter box form includes a box form main body and an auxiliary moving mechanism; Step S2, then position and install the drainage gutter processing molds along the design paths of the side drainage gutters symmetrically longitudinally on both sides of the tunnel; Step S3, seal both sides of the box form main body and the inner side of the filling formwork, and then pour concrete. After the strength of the poured concrete reaches the standard, start removing the formwork. Then, the box form main body moves along the design path to the next pouring stage to be carried out, and the filling formwork also moves to the next pouring stage to be carried out after being removed; Step S4, install a double-edge protection device in the main drainage gutter after formwork removal, and fit and install an integral single-edge protection bending plate at the edge of the side drainage gutter after formwork removal; Repeat Steps S1-S4. It has the advantages of shortening the construction period, reducing costs, having a smooth linear shape for the main drainage gutter, and a smooth linear shape for the side drainage gutters, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel invert drainage construction, and in particular relates to a method for synchronously constructing a tunnel invert main ditch, a side ditch and a filling ditch. Background Art

[0002] At present, for the construction of tunnel main drainage ditch, a crane is usually used to lift the box formwork from top to bottom to the designed position, and then the formwork is sealed and poured on both sides. After the concrete strength reaches the standard, the formwork is removed, and the box formwork is lifted to the adjacent next section for repeated pouring. The operation is cumbersome and the construction workers have a large workload. They also need to manually adjust the position of the box formwork at all times, but there are still manual errors, which makes it impossible for the box formwork to fall accurately on the designed path. The main drainage ditch path finally formed is not smooth and unsightly. Moreover, since the cross-section of the main drainage ditch is square, the box formwork is easily bumped against the freshly poured concrete during demoulding, resulting in large-scale scratches on the side walls of the main drainage ditch and / or wear of the box formwork side panels.

[0003] The central ditch of the tunnel plays an extremely important role as the main drainage channel during the construction and operation of the tunnel. However, due to the time interval between the construction of the invert arch and the pouring of concrete in the central main drainage ditch, there is currently no edge protection device for the central main drainage ditch after the completion of the invert arch construction. Therefore, the edges of the main drainage ditch are prone to damage such as bumps, missing edges, and falling corners.

[0004] Regarding the construction of tunnel side drainage ditches, since the concrete grades of the tunnel invert and the tunnel side walls are different, it is necessary to use filling templates to separate them and then pour the invert concrete. Semi-circular troughs are currently used to manually squeeze the newly poured invert concrete and then remove the troughs before the concrete is completely solidified, thereby forming drainage ditches on the left and right sides of the invert area. Because the concrete is soft before solidification, the semi-circular troughs placed on the concrete do not ensure weight balance, resulting in uneven depths of the drainage ditches. The squeezing also causes the drainage ditches to have uneven lines and missing corners. Summary of the Invention

[0005] The present invention aims to provide a method for the simultaneous construction of the main and side ditches and filling of a tunnel invert arch. The main drainage ditch box mold can be moved and positioned conveniently and accurately, and the side drainage ditch has a smooth linear shape and a consistent depth. This method solves the problems of an unsmooth and unsightly main drainage ditch path formed by hoisting the main drainage ditch box mold from top to bottom to the designed position using a crane, and the problems of uneven depth, uneven linear shape, and missing corners of the drainage ditch caused by artificial extrusion of a semi-circular trough.

[0006] To this end, the technical solution adopted by the present invention is: a method for synchronously constructing the main and side ditches of a tunnel invert, and filling the same, comprising the following steps:

[0007] Step S1: Position and install the main drainage ditch box form along the design path of the main drainage ditch longitudinally extending along the tunnel center. The main drainage ditch box form includes a box form main body and auxiliary moving mechanisms symmetrically located at the front and rear ends of the box form main body. The box form main body is an assembled box structure that is symmetric left and right. A telescopic device for adjusting the distance between the left and right side plates of the box form main body is installed inside the box form main body; the auxiliary moving mechanism includes support seats fixed on the front and rear walls of the box form main body and telescopic legs corresponding to the support seats up and down;

[0008] Step S2: Then, position and install the drainage trough processing mold along the design paths of the side drainage troughs symmetrically longitudinally on both sides of the tunnel. The drainage trough processing mold includes a filling template with a top surface flush with the surface to be filled, fixed arm bases longitudinally spaced along the outer side wall of the filling template, fixed arms installed on the fixed arm bases, a drainage trough mold longitudinally connecting the ends of all the fixed arms, and support rods longitudinally spaced along the outer side wall of the filling template. The fixed arm is overall in an "n" shape and bends along the outer side wall of the filling template to be flush with the filling surface. The filling template separates the tunnel invert and the tunnel side wall area. The horizontal bottom surface of the fixed arm base and the outer side wall of the filling template form a small triangular support space. One end of the support rod away from the filling template abuts against the tunnel side wall to form a large triangular support space, and together with the small triangular support space, they support the drainage trough processing mold for the tunnel invert filling;

[0009] Step S3: Seal both sides of the end box form main body and the inner side of the filling template, and then pour concrete. After the strength of the poured concrete reaches the standard, start removing the formwork. The box form main body is demolded by narrowing the lateral width through the telescopic device. Jacks are used to lift the box form main body front and back. The telescopic legs of the box form main body fall back to the bottom surface, supporting the box form main body to move along the design path to the next pouring stage. After the filling template is removed, it also moves to the next pouring stage;

[0010] Step S4: Install a double-edge protection device in the main drainage ditch after form removal. The double-edge protection device includes bending steel plates mirror-symmetrically and fittingly installed on the edges of the concrete side walls of the poured main drainage ditch. A horizontal steel rod is welded to the top surface of one side of the bending steel plate, and a sleeve through which the end of the horizontal steel rod passes is welded to the top surface of the other side of the bending steel plate. The horizontal steel rod and the sleeve are fixed by a tightening bolt; Fit and install a single-edge protection bending plate in an inverted "L" shape along the edge of the side drainage trough after form removal;

[0011] Repeat steps S1 - S4 for the main and side drainage construction of the next section of the tunnel invert.

[0012] As an optimization of the above solution, in step S1, the telescopic device includes hydraulic cylinder mounts welded longitudinally at intervals inside the box mold body and horizontal hydraulic cylinders symmetrically installed on the left and right sides of the hydraulic cylinder mounts. The end of the telescopic rod of the horizontal hydraulic cylinder is fixed on the left and right side plates of the box mold body on the same side. By arranging horizontal hydraulic cylinders inside the box mold body, the left and right side plates of the box mold body are driven to retract, narrowing the width of the box mold body, thus ensuring that the side plates of the box mold will not collide with the cast side walls, preventing large-area scratching of the side walls of the main drainage ditch and / or wear of the side plates of the box mold.

[0013] Further preferably, in step S1, the support base is provided with a vertical through hole, a platform for the jack to lift, and a hook for the crane to hang. The support base is provided with a platform for the jack to lift and a hook for the crane to hang, which facilitates the crane to lift in the initial stage. Then, when the box mold body moves to the next stage, first directly use the jack to lift the box mold body off the ground, and then lower the rollers. It is convenient, fast, and reasonably designed.

[0014] The telescopic support leg includes an inverted "T" - shaped support main frame with a vertical section passing through the vertical through hole and rollers located at the left and right ends of the horizontal section of the inverted "T" - shaped support main frame. An anti - detachment cross bar is provided at the top of the vertical section of the inverted "T" - shaped support main frame. The vertical section of the inverted "T" - shaped support main frame and the support base are provided with positioning holes with matching dimensions and are equipped with positioning pins. When the box mold body moves to the next stage to be cast, only by pulling out the positioning pins, the bottom surface of the rollers can be made flush with the bottom surface of the box mold body under the action of the self - weight of the box mold body. The design structure is ingenious, highly practical, and flexible in operation.

[0015] Further preferably, a platform is provided on the side of the support base away from the box mold body, and a hook is provided on the top surface of the support base. The position is reasonably designed, and the installation space of the jack is not blocked.

[0016] Further preferably, in step S3, when demolishing the mold, the box mold body is lifted off the ground. Under the action of the self - weight of the telescopic support leg, the anti - detachment cross bar falls on the top surface of the support base, and the rollers drop to the ground. The positioning holes of the support base and the inverted "T" - shaped support main frame coincide and are fixed by a laterally inserted positioning pin. Then, the rollers drive the suspended box mold body to move along the designed path of the main drainage ditch to the next casting section. The process is reasonable, time - saving, and labor - saving.

[0017] Further preferably, in step S1, a weight - adding water injection pipe is provided on the front end plate of the box mold body, and a drain pipe is provided on the rear end plate near the bottom of the box mold body. The weight - adding water injection pipe is higher than the drain pipe, and a height difference is formed, which is convenient for adding weight to the box mold by injecting water and then flowing out through the drain pipe.

[0018] It is further preferred that in step S2, the cross-section of the drainage trough mold is an inverted trapezoidal structure, and the structure with a larger top and a smaller bottom is convenient for removal and will not collide to affect the shape of the corners. The drainage trough mold is made of 8mm to 10mm thick steel plates seamlessly spliced together, and the fixed arm is made of 100mm to 110mm wide and 12mm to 14mm thick flat steel, with appropriate material selection and reasonable size. The fixed arm base is made of double-piece I-beams, and is longitudinally arranged at intervals of 0.8m to 1.2m on the outer wall of the filling template to ensure the support stability of the side drainage trough along the longitudinal direction of the tunnel.

[0019] Further preferably, the fixed arm base, the fixed arm and the filling template are welded together, and the end of the fixed arm is welded together with the drainage trough mold, the welding is firm and the structural connection is tight.

[0020] Further preferably, the support rod adopts a screw-nut mechanism to achieve rod length adjustment, thereby making real-time adjustments according to the distance from the tunnel side wall to ensure smooth linearity of the filling module.

[0021] It is further preferred that the top surface width of the box mold body is greater than the bottom surface width, and there is a width difference of 1cm to 2cm between the upper and lower end surfaces, so as to facilitate demoulding, and when the distance between the left and right side plates of the box mold body is narrowed, the exposed bottom plate part will not scratch the poured concrete side wall after lifting.

[0022] Beneficial effects of the present invention:

[0023] (1) Compared with using a crane to directly lift the box formwork for demoulding, this solution uses a telescopic device to narrow the horizontal width of the box formwork body for demoulding, which effectively avoids the box formwork from colliding with the freshly poured concrete during demoulding, causing the side walls of the main drainage ditch to be scratched over a large area and / or the side panels of the box formwork to be worn. The design concept is ingenious and meets actual needs.

[0024] (2) Compared with using a crane to lift the box formwork from top to bottom to the designed position, this solution uses a jack to lift the box formwork body, and the telescopic legs of the box formwork body fall back to the bottom surface, supporting and driving the box formwork body to move along the designed path of the main drainage ditch, reducing the problem of poor alignment accuracy during lifting and lowering and the need for manual calibration, effectively reducing the workload of construction personnel, improving the construction efficiency of the main drainage ditch, shortening the construction period, reducing costs, and ensuring that the main drainage ditch finally cast has a smooth line and beautiful shape.

[0025] (3) Compared with the method of using a semi-circular groove tool to manually extrude the freshly poured invert concrete and then removing the groove tool before the concrete is completely solidified to form a side drainage groove, fixed arms corresponding one by one to the fixed arm bases longitudinally spaced along the outer wall of the filling formwork are adopted. The fixed arms start from the top of the fixed arm bases, expose above the filling surface along the outer wall of the filling formwork, and then bend into an "n" shape until they are flush with the filling surface. Finally, the drainage groove mold is longitudinally connected to all the fixed arms, so as to ensure that the side drainage grooves are of consistent depth, smooth in line type, and complete at the corners.

[0026] (4) The horizontal bottom surface of the fixed arm base and the outer wall of the filling formwork form a small triangular support space, and one end of the support rod away from the filling formwork abuts against the tunnel side wall to form a large triangular support space. Combining with the small triangular support space, they jointly support the processing mold of the tunnel invert filling drainage groove. Therefore, no additional manual auxiliary support is required. Only by arranging the position of the filling formwork properly can self-support be achieved. The overall design concept is ingenious, in line with the actual situation of the tunnel side wall, and the structure has high self-support stability.

[0027] (5) The double-edge protection device installed in the main drainage ditch after form removal. The bent steel plate can prevent damage to the edges of the poured concrete, and the installation and fixation of the two bent steel plates are achieved through the cooperation of the steel rod and the tightening bolt on the sleeve. The distance between the two bent steel plates can also be flexibly adjusted according to the actual situation, and the two side bent steel plates are tightly abutted and attached to the corresponding edges. The components are low in cost, convenient for installation and removal, and can be recycled.

[0028] In summary, it has the advantages of meeting the actual needs, shortening the construction period, reducing costs, smooth line type of the main drainage ditch, and smooth line type of the side drainage grooves, etc. Brief Description of the Drawings

[0029] Figure 1 It is a schematic diagram of step S2 of the present invention.

[0030] Figure 2 It is a structural schematic diagram of the box mold body.

[0031] Figure 3 It is an internal structural schematic diagram of the box mold body.

[0032] Figure 4 It is a structural schematic diagram of the drainage groove processing mold.

[0033] Figure 5 It is a structural schematic diagram of the double-edge protection device. Detailed Embodiment

[0034] The present invention will be further described below through embodiments in combination with the drawings:

[0035] Combined with Figure 1 — Figure 5As shown in the figure, a synchronous construction method for the main drain, side drain and filling of the invert of a tunnel is as follows:

[0036] Step S1: Position and install the main drain box form along the design path of the main drain extending longitudinally along the tunnel center. The main drain box form includes a box form main body 1 and auxiliary moving mechanisms 2 symmetrically located at the front and rear ends of the box form main body 1.

[0037] The box form main body 1 is an overall split box structure symmetric about the left and right. A telescopic device for adjusting the distance between the left and right side plates of the box form main body 1 is installed inside the box form main body 1.

[0038] The telescopic device includes hydraulic cylinder mounting seats 11 welded longitudinally and spaced apart inside the box form main body 1, and horizontal hydraulic cylinders 12 symmetrically installed on the left and right sides of the hydraulic cylinder mounting seats 11. The end of the telescopic rod of the horizontal hydraulic cylinder 12 is fixed on the left and right side plates of the box form main body 1 on the same side.

[0039] The top width of the box form main body 1 is greater than the bottom width, and there is a width difference of 1 cm to 2 cm between the upper and lower end faces.

[0040] The auxiliary moving mechanism 2 is composed of support seats 21 fixed on the front and rear walls of the box form main body 1 and telescopic legs 22 corresponding to the support seats 21 up and down.

[0041] In step S1, the support seat 21 is provided with a vertical through hole 211, a platform 212 for jacking up, and a lifting hook 213 for hooking.

[0042] The telescopic leg 22 is composed of an inverted "T" - shaped support main frame 221 with a vertical section passing through the vertical through hole 211 and rollers 222 located at the left and right ends of the horizontal section of the inverted "T" - shaped support main frame 221.

[0043] An anti - detachment cross bar 223 is provided at the top of the vertical section of the inverted "T" - shaped support main frame 221. The vertical section of the inverted "T" - shaped support main frame 221 and the support seat 21 are provided with positioning holes with matching dimensions and are equipped with positioning pins 23.

[0044] A platform 212 is provided on the side of the support seat 21 away from the box form main body 1, and a lifting hook 213 is provided on the top surface of the support seat 21.

[0045] In step S1, a counterweight water injection pipe 13 is provided on the front end plate of the box form main body 1, and a drain pipe close to the bottom of the box form main body 1 is provided on the rear end plate. The counterweight water injection pipe 13 is higher than the drain pipe.

[0046] Step S2. Then, position and install the drainage trough processing mold along the design path of the lateral drainage troughs symmetrically longitudinally on both sides of the tunnel. The drainage trough processing mold consists of a filling template 3 with its top surface flush with the surface to be filled, fixed arm bases 4 arranged longitudinally at intervals along the outer wall of the filling template 3, fixed arms 5 installed on the fixed arm bases 4, a drainage trough mold 6 longitudinally connecting the ends of all the fixed arms 5, and support rods 7 arranged longitudinally at intervals along the outer wall of the filling template 3.

[0047] The fixed arm 5 is integrally in an "n" shape and bends along the outer wall of the filling template 3 to be flush with the filling surface.

[0048] The filling template 3 separates the tunnel invert and the tunnel side wall area.

[0049] The horizontal bottom surface of the fixed arm base 4 and the outer wall of the filling template 3 form a small triangular support space.

[0050] One end of the support rod 7 away from the filling template 3 abuts against the tunnel side wall to form a large triangular support space, and together with the small triangular support space, they jointly support the drainage trough processing mold for the tunnel invert filling.

[0051] In step S2, the cross-section of the drainage trough mold 6 is in an inverted trapezoidal structure.

[0052] The drainage trough mold 6 is preferably made of seamless splicing of steel plates with a thickness of 8 mm to 10 mm; the fixed arm 5 is preferably made of flat steel with a width of 100 mm to 110 mm and a thickness of 12 mm to 14 mm, the fixed arm base 4 is preferably made of double-spliced I-beams, and they are preferably arranged longitudinally at intervals of 0.8 m to 1.2 m along the outer wall of the filling template 3.

[0053] The fixed arm base 4, the fixed arm 5 and the filling template 3 are welded and connected. The ends of the fixed arms 5 and the drainage trough mold 6 are preferably welded and connected. The support rod 7 preferably adopts a screw-nut mechanism to realize the adjustment of the rod body length.

[0054] Step S3. On both sides of the end-sealing box mold body 1 and inside the filling template 3, then pour concrete.

[0055] When the strength of the poured concrete reaches the standard, start removing the mold. The telescopic support legs 22 of the box mold body 1 fall back to the bottom surface, and then support the box mold body 1 front and back to move along the design path to the next pouring stage. After the filling template 3 is removed, it also moves to the next pouring stage;

[0056] In step S3, when removing the mold, lift the box mold body 1 into the air. Under the action of the self-gravity of the telescopic support legs 22, the anti-disengagement cross bar 223 falls on the top surface of the support seat 21, the rollers 222 drop to the ground, the positioning holes of the support seat 21 and the inverted "T" - shaped support main frame 221 coincide and are fixed by the positioning pin 23 passing through transversely. Then, the rollers 222 drive the suspended box mold body 1 to move along the design path of the main drainage ditch to the next pouring section.

[0057] Step S4: Install the double-edge protection device 8 in the main drainage ditch after form removal.

[0058] The double-edge protection device 8 is composed of bending steel plates 81 that are mirror-symmetrically and adhesively installed on the edges of the concrete side walls of the main drainage ditch that have been poured. A horizontal steel rod 83 is welded to the top surface of one side of the bending steel plate 81, and a sleeve 82 through which the end of the horizontal steel rod 83 passes is welded to the top surface of the bending steel plate 81 on the other side.

[0059] The horizontal steel rod 83 and the sleeve 82 are fixed by a tightening bolt.

[0060] A single-edge protection bending plate that is integrally in an inverted "L" shape is adhesively installed at the edge of the side drainage trough after form removal.

[0061] Repeat steps S1 - S4 to carry out the main side drainage construction of the next section of the tunnel invert.

Claims

1. A synchronous construction method for the main gutter, side gutter and filling of the inverted arch of a tunnel, characterized in that It includes the following steps: Step S1: Position and install the main drainage ditch box form along the design path of the main drainage ditch longitudinally extending along the tunnel center. The main drainage ditch box form includes a box form main body (1) and auxiliary moving mechanisms (2) symmetrically located at the front and rear ends of the box form main body (1). The box form main body (1) is an assembled box structure that is symmetrical left and right. A telescopic device for adjusting the distance between the left and right side plates of the box form main body (1) is installed inside the box form main body (1). The auxiliary moving mechanism (2) includes support seats (21) fixed on the front and rear walls of the box form main body (1) and telescopic legs (22) corresponding to the support seats (21) up and down; Step S2: Then, position and install the drainage trough processing mold along the design paths of the side drainage troughs longitudinally symmetrical on both sides of the tunnel. The drainage trough processing mold includes a filling template (3) with a top surface flush with the surface to be filled, fixed arm bases (4) longitudinally spaced along the outer side wall of the filling template (3), fixed arms (5) installed on the fixed arm bases (4), a drainage trough mold (6) longitudinally connecting the ends of all the fixed arms (5), and support rods (7) longitudinally spaced along the outer side wall of the filling template (3). The fixed arm (5) is integrally in an "n" shape and bends along the outer side wall of the filling template (3) to be flush with the filling surface. The filling template (3) separates the tunnel invert and the tunnel side wall area. The horizontal bottom surface of the fixed arm base (4) and the outer side wall of the filling template (3) form a small triangular support space. The end of the support rod (7) away from the filling template (3) abuts against the tunnel side wall to form a large triangular support space, and together with the small triangular support space, it supports the drainage trough processing mold for the tunnel invert filling; Step S3: Seal the two sides of the end box form main body (1) and the inner side of the filling template (3), and then pour concrete. After the poured concrete reaches the qualified strength, start removing the formwork. The box form main body (1) is demolded by narrowing the lateral width through the telescopic device. The box form main body (1) is lifted by a jack front and back. The telescopic legs (22) of the box form main body (1) fall back to the bottom surface to support the box form main body (1) to move along the design path to the next pouring stage. After the filling template (3) is removed, it also moves to the next pouring stage; Step S4: Install a double-edge protection device (8) in the main drainage ditch after removing the formwork. The double-edge protection device (8) includes bent steel plates (81) mirror-symmetrically and fittingly installed on the edges of the side walls of the concrete of the main drainage ditch after pouring. A horizontal steel rod (83) is welded to the top surface of one side of the bent steel plate (81), and a sleeve (82) for the end of the horizontal steel rod (83) to pass through is welded to the top surface of the other side of the bent steel plate (81). The horizontal steel rod (83) and the sleeve (82) are fixed by a tightening bolt; Fit and install a single-edge protection bent plate integrally in an inverted "L" shape at the edge of the side drainage trough after removing the formwork; Repeat steps S1 - S4 for the main side drainage construction of the next section of the tunnel invert.

2. The synchronous construction method of the main gutter, side gutter and filling of the tunnel invert according to claim 1, characterized in that: In the step S1, the telescopic device includes a hydraulic cylinder mounting seat (11) welded longitudinally and spaced apart inside the box mold body (1), and horizontal hydraulic cylinders (12) symmetrically mounted on the left and right sides of the hydraulic cylinder mounting seat (11). The end of the telescopic rod of the horizontal hydraulic cylinder (12) is fixed on the left and right side plates of the box mold body (1) on the same side.

3. A synchronous construction method for the main gutter, side gutter and filling of the inverted arch of a tunnel according to claim 1, characterized in that: In the step S1, the support base (21) is provided with a vertical through hole (211), a platform (212) for the jack to lift, and a lifting hook (213) for the lifting hook to hang. The telescopic leg (22) includes an inverted "T" - shaped support main frame (221) with a vertical section passing through the vertical through hole (211), and rollers (222) located at the left and right ends of the horizontal section of the inverted "T" - shaped support main frame (221). An anti - detachment cross bar (223) is provided at the top of the vertical section of the inverted "T" - shaped support main frame (221). The vertical section of the inverted "T" - shaped support main frame (221) and the support base (21) are provided with positioning holes with matching dimensions and are equipped with positioning pins (23).

4. A synchronous construction method for the main gutter, side gutter and filling of a tunnel invert, according to claim 3, characterized in that: On one side of the support base (21) away from the box mold body (1), there is a platform (212), and a lifting hook (213) is provided on the top surface of the support base (21).

5. A synchronous construction method for the main gutter, side gutter and filling of a tunnel invert, as claimed in claim 3, wherein: In the step S3, when demolishing the mold, the box mold body (1) is lifted and suspended. Under the action of the self - weight of the telescopic leg (22), the anti - detachment cross bar (223) falls on the top surface of the support base (21), the rollers (222) drop to the ground, the positioning holes of the support base (21) and the inverted "T" - shaped support main frame (221) coincide and are fixed by the horizontally inserted positioning pin (23). Then, the rollers (222) drive the suspended box mold body (1) to move along the designed path of the main drainage ditch to the next pouring section.

6. A synchronous construction method for the main gutter, side gutter and filling of a tunnel invert, according to claim 1, characterized in that: In the step S1, a counterweight water injection pipe (13) is provided on the front end plate of the box mold body (1), and a drain pipe is provided on the rear end plate near the bottom of the box mold body (1). The counterweight water injection pipe (13) is higher than the drain pipe.

7. A synchronous construction method for the main gutter, side gutter and filling of a tunnel invert, as claimed in claim 1, wherein: In the step S2, the cross - section of the drainage trough mold (6) is in an inverted trapezoid structure. The drainage trough mold (6) is seamlessly spliced with 8 mm - 10 mm thick steel plates. The fixed arm (5) is made of flat steel with a width of 100 mm - 110 mm and a thickness of 12 mm - 14 mm. The fixed arm base (4) is made of double - spliced I - beams and is longitudinally arranged on the outer wall of the filling formwork (3) at intervals of 0.8 m - 1.2 m.

8. A synchronous construction method for the main and side ditches and filling of a tunnel invert, according to claim 7, characterized in that: The fixed arm base (4), the fixed arm (5) and the filling formwork (3) are welded together. The end of the fixed arm (5) and the drainage trough mold (6) are welded together.

9. A synchronous construction method for the main gutter, side gutter and filling of the inverted arch of a tunnel according to claim 8, characterized in that: The support rod (7) adopts a screw - nut mechanism to realize the adjustment of the rod body length.

10. A synchronous construction method for the main and side ditches and filling of a tunnel invert, according to claim 3, characterized in that: The top surface width of the box mold body (1) is greater than the bottom surface width, and there is a width difference of 1 cm - 2 cm between the upper and lower end faces.

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