Construction Method and Formwork System for Simultaneous Casting of Drainage Ditch and Crash Barrier in Tunnel

Abstract

This invention relates to a formwork system for the simultaneous casting of drainage ditches and crash barriers in tunnels, comprising a positioning bracket, a foam caulking board, a U-shaped inner mold, drainage ditch side molds, crash barrier side molds, and adjustable support rods. The positioning bracket has positioning holes, through which connecting sleeves and support screws pass to fix the positioning bracket to the tunnel floor slab. The crash barrier reinforcement cage and drainage ditch reinforcement cage are inserted into the connecting sleeve. The bottom plate of the U-shaped inner mold has vertical screw holes, and the U-shaped inner mold is fixed to the support screws. The drainage ditch side mold is connected and fixed to the outer side plate of the U-shaped inner mold via tie rods. The lower end of the crash barrier side mold is supported and fixed to the horizontal top plate of the U-shaped inner mold. The lower end of the adjustable support rod is fixed to a support hook on the bottom plate of the U-shaped inner mold, and the upper end of the adjustable support rod is fixed to a support hook on the crash barrier side mold. This technology integrates the casting of the drainage ditch and crash barrier in the tunnel, improving the overall structural integrity and preventing leakage in the drainage ditch.

Description

Technical Field

[0001] This invention relates to the cast-in-place construction of drainage ditches and crash barriers in tunnels, and particularly to a formwork system and construction method for the simultaneous casting of drainage ditches and crash barriers in tunnels. Background Technology

[0002] When constructing drainage ditches and crash barriers in tunnels, a separate construction method is typically used: the crash barriers are constructed first, and then the drainage ditches are poured afterward. This method not only increases the on-site workload but also creates construction joints between the drainage ditches and crash barriers, which can easily lead to leakage. Constructing the crash barriers and drainage ditches simultaneously avoids construction joints, ensures water tightness, reduces on-site workload, and improves construction efficiency. However, the complex cross-sectional shapes of the crash barriers and drainage ditches make formwork erection and dismantling difficult.

[0003] In addition, the reinforcing bars in crash barriers and drainage ditches are usually tied on-site, which increases the workload of on-site workers and makes it difficult to guarantee the quality of the tying. Therefore, a method has been developed where the reinforcing cages are tied in the factory and transported to the construction site for installation and fixing. However, this method has problems such as difficulty in fixing the reinforcing cages and easy displacement during concrete pouring. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the current cast-in-place construction of drainage ditches and crash barriers in tunnels, and to propose a formwork support system and construction method for the simultaneous casting of drainage ditches and crash barriers in tunnels. To achieve this purpose, the invention adopts the following technical solution:

[0005] The present invention relates to a formwork system for simultaneous casting of drainage ditch and crash barrier in tunnel, comprising positioning brackets, foam caulking boards, U-shaped inner molds, drainage ditch side molds, crash barrier side molds, and adjustable support rods;

[0006] The positioning bracket is a hollow multi-hole frame structure with positioning holes distributed on it. The lower ends of the docking sleeve and the support screw pass through the positioning holes to install and fix the positioning bracket on the tunnel floor. The bottom of the anti-collision wall steel cage and the drainage ditch steel cage are inserted into the docking sleeve.

[0007] The U-shaped inner mold is U-shaped in general. The bottom plate of the U-shaped inner mold is provided with vertical screw holes. The U-shaped inner mold is installed and fixed on the support screw rod, which passes through the vertical screw holes.

[0008] The drainage ditch side mold is connected and fixed to the outer side plate of the U-shaped inner mold by tie rods, and the tie rods pass through the outer side plate of the U-shaped inner mold and the transverse screw holes on the drainage ditch side mold;

[0009] The lower end of the anti-collision wall side mold is fixed to the horizontal top plate of the U-shaped inner mold;

[0010] The lower end of the adjustable support rod is connected to the support hook on the bottom plate of the U-shaped inner mold, and the upper end of the adjustable support rod is connected to the support hook on the side mold of the anti-collision wall.

[0011] The foam caulking board is installed close to the tunnel sidewall.

[0012] Preferably, the U-shaped inner mold, the drainage ditch side mold, and the crash barrier side mold have stiffening ribs. The U-shaped inner mold, the drainage ditch side mold, and the crash barrier side mold are longitudinally spliced ​​together. Adjacent U-shaped inner molds, adjacent drainage ditch side molds, and adjacent crash barrier side molds are all fixed with extension bolts. The extension bolts pass through the stiffening ribs at the ends of adjacent molds for fixation. A longitudinal joint is formed between adjacent U-shaped inner molds, adjacent drainage ditch side molds, and adjacent crash barrier side molds. A rubber pad layer is provided in the longitudinal joint.

[0013] Preferably, the support screw is provided with an adjusting nut and a fastening nut, with the adjusting nut located below the bottom plate of the U-shaped inner mold and the fastening nut located above the bottom plate of the U-shaped inner mold.

[0014] Preferably, the horizontal top plate of the U-shaped inner mold is provided with positioning ribs and positioning plates, and the lower end of the stiffening rib of the anti-collision wall side mold is provided with positioning plates and insertion grooves, and the insertion grooves on the anti-collision wall side mold are inserted into the positioning ribs on the U-shaped inner mold.

[0015] Preferably, a pre-embedded sleeve is fitted onto the tie rod, and the pre-embedded sleeve is located between the outer side plate of the drainage ditch side mold and the U-shaped inner mold.

[0016] Preferably, the foam jointing board is adhered to the tunnel sidewall using structural adhesive.

[0017] A construction method for a formwork support system for simultaneous casting of drainage ditches and crash barriers inside tunnels includes the following construction steps:

[0018] Step 1. Roughen the surface of the tunnel floor, and then clean the debris and concrete blocks from the tunnel floor and tunnel sidewalls;

[0019] Step 2. Lay out the edge lines of the crash barrier and drainage ditch on the tunnel floor and tunnel sidewalls, then locate the plane position of the positioning bracket, and then drive the mating sleeve and support screw into the tunnel floor according to the position of the positioning hole. Use structural adhesive to install and fix the foam caulking board to the tunnel sidewall.

[0020] Step 3. After the tied anti-collision wall steel cage and drainage ditch steel cage are transported to the construction site, align the pre-reserved butt steel bars at the bottom of the steel cage with the butt sleeve and insert them into the butt sleeve to complete the installation and fixing of the steel cage.

[0021] Step 4. Adjust the height of the adjusting nut on the support screw so that the top surface of the adjusting nut is aligned with the bottom surface of the drainage ditch. Then install the U-shaped inner mold. The support screw passes through the vertical screw hole on the U-shaped inner mold, and the U-shaped inner mold is supported on the adjusting nut. Then install and tighten the fastening nut.

[0022] Step 5. Install and fix the drainage ditch side mold based on the U-shaped inner mold. Pass the tie rods through the transverse screw holes on the U-shaped inner mold and the anti-collision wall side mold to connect and fix the drainage ditch side mold to the U-shaped inner mold. When installing the tie bolts, put the pre-embedded sleeve on the tie bolts so that the pre-embedded sleeve is located between the outer plate of the U-shaped inner mold and the drainage ditch side mold.

[0023] Step 6. Install the side mold of the crash barrier wall based on the U-shaped inner mold and fix it with the adjustable support rod. Insert the insertion slot on the side mold of the crash barrier wall into the positioning rib on the U-shaped inner mold. Connect the upper and lower ends of the adjustable support rod to the support hooks of the side mold of the crash barrier wall and the U-shaped inner mold respectively. Then adjust the length of the adjustable support rod to keep the side mold of the crash barrier wall upright.

[0024] Step 7. Install the U-shaped inner mold, drainage ditch side mold and crash barrier side mold segment by segment according to the methods described in Steps 4, 5 and 6. Splice the U-shaped inner mold, drainage ditch side mold and crash barrier side mold sequentially along the longitudinal direction of the tunnel. Use extension bolts to fix the ends of adjacent molds and set rubber pads in the joints to improve the sealing performance of the joints.

[0025] Step 8. After the steel cage and formwork of the crash barrier and drainage ditch are installed, concrete pouring is carried out, and water curing is carried out after the concrete is poured.

[0026] Step 9. After the concrete of the crash barrier and drainage ditch has cured to the design strength, remove the side formwork of the drainage ditch, the side formwork of the crash barrier, and the U-shaped inner formwork in sequence. Then, cut off the exposed support bolts along the surface of the drainage ditch. After removing the tie bolts, clear the pre-embedded sleeves to ensure that the seepage channels on the side wall of the drainage ditch are unobstructed. After removing the U-shaped inner formwork, a drainage ditch is formed at this location. Cover the drainage ditch with a rain grate.

[0027] Step 10. Construct the lower layer and upper layer of the road.

[0028] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0029] 1. This technology integrates the drainage ditch and crash barrier inside the tunnel into a single casting, which can reduce construction joints, improve the overall integrity of the structure, and prevent leakage in the drainage ditch.

[0030] 2. Using positioning brackets to assist in the installation and positioning of the steel cage can effectively improve the installation accuracy of the steel cage and the efficiency of on-site operations, thereby ensuring the forming quality of the crash barrier and drainage ditch.

[0031] 3. The U-shaped inner mold is used to install and fix the side molds of the crash barrier and drainage ditch, which can effectively prevent the formwork from shifting during concrete pouring. In addition, the use of adjustable bracing rods for support and fixation reduces the number of rods and improves the convenience of concrete pouring.

[0032] 4. Seepage channels are installed on the side walls of the drainage ditch to divert and discharge rainwater that has seeped into the road structure layer, thereby improving the drainage effect.

[0033] 5. Foam sealant is installed between the crash barrier and the tunnel sidewall to form a buffer layer, preventing vehicle impacts from hitting the tunnel sidewall and ensuring the safety of the tunnel structure. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the positioning bracket installation;

[0035] Figure 2 This is a schematic diagram of the installation of the steel reinforcement cage for the crash barrier and drainage ditch;

[0036] Figure 3 This is a schematic diagram showing the installation and positioning of the formwork for the crash barrier and drainage ditch;

[0037] Figure 4 This is a schematic diagram of the installation and positioning of the drainage ditch template. Figure 3 (Detailed partial view);

[0038] Figure 5 This is a schematic diagram of the concrete pouring for the crash barrier and drainage ditch;

[0039] Figure 6 This is a schematic diagram showing the completed construction of the crash barrier and drainage ditch;

[0040] Figure 7 This is a three-dimensional structural diagram of the side formwork of the crash barrier;

[0041] Figure 8 This is a schematic diagram of the side formwork extension of the crash barrier;

[0042] Figure 9 This is a schematic diagram of the three-dimensional structure of the U-shaped inner mold;

[0043] Figure 10 This is a schematic diagram of the U-shaped inner mold extension;

[0044] Figure 11 This is a three-dimensional structural diagram of the formwork splicing of the crash barrier and drainage ditch;

[0045] Figure 12 This is a three-dimensional structural diagram of the positioning bracket.

[0046] The diagram is labeled as follows: 11-Tunnel sidewall, 12-Tunnel floor slab, 2-Positioning bracket, 21-Positioning hole, 22-Matching sleeve, 23-Supporting screw, 24-Adjusting nut, 25-Fastening nut, 31-Bumper wall reinforcement cage, 32-Drainage ditch reinforcement cage, 33-Foam caulking board, 41-U-shaped inner formwork, 42-Horizontal top slab, 43-Drainage ditch side formwork, 44-Bumper wall side formwork, 45-Stiffening rib, 46-Positioning rib. 47-Positioning plate, 48-Interlocking slot, 49-Vertical screw hole, 410-Horizontal screw hole, 411-Embedded sleeve, 412-Tie rod, 413-Extending screw, 414-Support hook, 415-Adjustable support rod, 416-Rubber pad, 51-Concrete, 52-Bumper wall, 53-Drainage ditch, 54-Seepage channel, 55-Rain grate, 56-Lower layer of road, 57-Upper layer of road. Detailed Implementation

[0047] To enhance understanding of the present invention, reference will be made below to the appendix. Figure 1 To be continued Figure 12 The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention and provide detailed implementation methods. However, the protection scope of the present invention is not limited to the following embodiments.

[0048] like Figure 1-12 As shown, a formwork system for simultaneous casting of drainage ditch and crash barrier in a tunnel includes a positioning bracket 2, a foam caulking board 33, a U-shaped inner mold 41, a drainage ditch side mold 43, a crash barrier side mold 44, and an adjustable support rod 415.

[0049] The positioning bracket 2 is a perforated frame structure with positioning holes 21 distributed on it. The lower ends of the connecting sleeve 22 and the supporting screw 23 pass through the positioning holes 21 to install and fix the positioning bracket 2 onto the tunnel floor 12. The positioning holes 21 on the positioning bracket 2 are used to position the connecting sleeve 22 and the supporting screw 23. The bottom of the anti-collision wall steel cage 31 and the drainage ditch steel cage 32 have pre-reserved connecting steel bars. During installation, the connecting steel bars at the bottom of the anti-collision wall steel cage 31 and the drainage ditch steel cage 32 are inserted into the connecting sleeve 22.

[0050] The U-shaped inner mold 41 is U-shaped in overall form. A vertical screw hole 49 is provided on the bottom plate of the U-shaped inner mold 41. The U-shaped inner mold 41 is mounted and fixed on a support screw 23, which passes through the vertical screw hole 49. The support screw 23 is equipped with an adjusting nut 24 and a fastening nut 25. The adjusting nut 24 is located below the bottom plate of the U-shaped inner mold 41, and the fastening nut 25 is located above the bottom plate of the U-shaped inner mold 41. The bottom plate of the U-shaped inner mold 41 is fixed in place by the fastening nut 25 and the adjusting nut 24. The bottom mounting height of the U-shaped inner mold 41 can be adjusted by using the fastening nut 25 and the adjusting nut 24.

[0051] The drainage ditch side mold 43 is installed on one side of the U-shaped inner mold 41. The drainage ditch side mold 43 is connected and fixed to the outer side plate of the U-shaped inner mold 41 by tie rods 412. The two ends of the tie rods 412 pass through the outer side plate of the U-shaped inner mold 41 and the transverse screw holes 410 on the drainage ditch side mold 43, respectively. A pre-embedded sleeve 411 is fitted on the tie rods 412, and the pre-embedded sleeve 411 is located between the drainage ditch side mold 43 and the outer side plate of the U-shaped inner mold 41.

[0052] The U-shaped inner mold 41, the drainage ditch side mold 43, and the anti-collision wall side mold 44 have stiffening ribs 45.

[0053] The lower end of the anti-collision wall side mold 44 is fixed to the horizontal top plate 42 of the U-shaped inner mold 41. The horizontal top plate 42 is located on the side of the upper end of the U-shaped inner mold 41 away from the drainage ditch side mold 43, and the horizontal top plate 42 extends horizontally outward toward the outside of the U-shaped inner mold 41.

[0054] The U-shaped inner mold 41 has positioning ribs 46 and positioning plates 47 on its horizontal top plate 42. The positioning ribs 46 are arranged along the length of the horizontal top plate 42. The positioning plates 47 are arranged in pairs along the length of the positioning ribs 46, with the distance between the two positioning plates 47 in each pair being the thickness of one positioning plate 47. The lower end of the stiffening ribs 45 of the crash barrier side mold 44 has positioning plates 47 and insertion slots 48. The positioning plates 47 on the crash barrier side mold 44 are inserted between the two positioning plates 47 on the horizontal top plate 42, and the insertion slots 48 on the crash barrier side mold 44 are engaged with the positioning ribs 46 on the U-shaped inner mold 41.

[0055] The lower end of the adjustable support rod 415 is connected to the support hook 414 on the bottom plate of the U-shaped inner mold 45, and the upper end of the adjustable support rod 415 is connected to the support hook 414 on the side mold 44 of the crash barrier. The adjustable support rod 415 is a rod with an adjustable length. The adjustable support rod 415 is used to adjust the installation angle of the side mold 44 of the crash barrier. By adjusting the length of the adjustable support rod 415, the side mold 44 of the crash barrier is kept upright.

[0056] The foam joint sealant 33 is installed in close contact with the tunnel sidewall 11. In this invention, the foam joint sealant 33 is adhered to the tunnel sidewall 11 by structural adhesive.

[0057] During construction, the U-shaped inner formwork 41, drainage ditch side formwork 43, and crash barrier side formwork 44 are longitudinally spliced ​​together. Each adjacent U-shaped inner formwork 41, drainage ditch side formwork 43, and crash barrier side formwork 44 is fixed together using extension bolts 413. During splicing, each U-shaped inner formwork 41, drainage ditch side formwork 43, or crash barrier side formwork 44 is a splicing unit. The extension bolts 413 pass through the stiffening ribs 45 at the ends of adjacent formwork units for fixation, thus achieving splicing and fixing between two splicing units. The adjacent formwork referred to here is the U-shaped inner formwork 41, drainage ditch side formwork 43, or crash barrier side formwork 44.

[0058] A longitudinal joint is formed between two adjacent U-shaped inner molds 41, adjacent drainage ditch side molds 43 and two adjacent anti-collision wall side molds 44. A rubber pad 416 is provided in the longitudinal joint, which can improve the sealing performance of the joint.

[0059] The construction method of the tunnel drainage ditch and anti-collision wall synchronous casting formwork system of the present invention includes the following construction steps:

[0060] Step 1. Roughen the surface of the tunnel floor slab 12, and then clean up the debris and concrete blocks on the tunnel floor slab 12 and the tunnel sidewalls 11.

[0061] Step 2. Lay out the edge lines of the anti-collision wall 52 and drainage ditch 53 on the tunnel floor 12 and tunnel sidewall 11, then locate the plane position of the positioning bracket 2, and then drive the connecting sleeve 22 and support screw (23) into the tunnel floor 12 according to the position of the positioning hole 21. Use structural adhesive to install and fix the foam caulking board 33 on the tunnel sidewall 11.

[0062] Step 3. After the tied anti-collision wall steel cage 31 and drainage ditch steel cage 32 are transported to the construction site, align the pre-reserved butt steel bars at the lower end of the steel cage with the butt sleeve 22 and insert them into the butt sleeve 22 to complete the installation and fixing of the steel cage.

[0063] Step 4. Adjust the height of the adjusting nut 24 on the support screw 23 so that the top surface elevation of the adjusting nut 24 is aligned with the bottom elevation of the drainage ditch 53. Then install the U-shaped inner mold 41. The support screw 23 passes through the vertical screw hole 49 on the U-shaped inner mold 41. The U-shaped inner mold 41 is supported on the adjusting nut 24. Then install and tighten the fastening nut 25.

[0064] Step 5. Install and fix the drainage ditch side mold 43 based on the U-shaped inner mold 41. Pass the tie rod 412 through the transverse screw hole 410 on the U-shaped inner mold 41 and the anti-collision wall side mold 44 to connect and fix the drainage ditch side mold 43 to the U-shaped inner mold 41. When installing the tie bolt 412, put the pre-embedded sleeve 411 on the tie bolt 412 so that the pre-embedded sleeve 411 is located between the outer plate of the U-shaped inner mold 41 and the drainage ditch side mold 43.

[0065] Step 6. Install the crash barrier side mold 44 based on the U-shaped inner mold 41 and fix it with the adjustable support rod 415. Insert the insertion slot 48 on the crash barrier side mold 44 into the positioning rib 46 on the U-shaped inner mold 41. Connect the upper and lower ends of the adjustable support rod 415 to the support hooks 414 of the crash barrier side mold 44 and the U-shaped inner mold 41, respectively. Then adjust the length of the adjustable support rod 415 to keep the crash barrier side mold 44 upright.

[0066] Step 7. Install the U-shaped inner mold 41, drainage ditch side mold 43 and crash barrier side mold 44 segment by segment according to the methods described in Steps 4, 5 and 6. Splice the U-shaped inner mold 41, drainage ditch side mold 43 and crash barrier side mold 44 sequentially along the longitudinal direction of the tunnel. Use extension bolts 413 to fix the ends of adjacent molds, and set a rubber pad layer 416 in the joint to improve the sealing performance of the joint.

[0067] Step 8. After the steel cage and formwork of the crash barrier 52 and drainage ditch 53 are installed, concrete 51 is poured. After concrete 51 is poured, it is cured by watering.

[0068] Step 9. After the concrete of the crash barrier 52 and drainage ditch 53 has cured to the design strength, the side formwork 43 of the drainage ditch, the side formwork 44 of the crash barrier, and the U-shaped inner formwork 41 are removed in sequence. Then, the exposed support bolts 23 are cut off along the surface of the drainage ditch 43. After removing the tie rods 412, the pre-embedded sleeves 411 are cleared to ensure that the seepage channels 54 on the side wall of the drainage ditch 53 are unobstructed. After removing the U-shaped inner formwork 41, the drainage ditch 53 is formed at this position. The drainage ditch 53 is covered with a rain grate 55.

[0069] Step 10. Construct the lower layer 56 and the upper layer 57 of the road.

[0070] The present invention has been described in detail above with reference to the embodiments, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A formwork system for simultaneous casting of drainage ditches and crash barriers inside tunnels, characterized in that, It includes positioning bracket (2), foam caulking board (33), U-shaped inner mold (41), drainage ditch side mold (43), anti-collision wall side mold (44) and adjustable support rod (415). The positioning bracket (2) is a hollow multi-hole frame structure with positioning holes (21) distributed on it. The lower ends of the docking sleeve (22) and the support screw (23) pass through the positioning holes (21) to install and fix the positioning bracket (2) on the tunnel bottom plate (12). The bottom of the anti-collision wall steel cage (31) and the drainage ditch steel cage (32) are inserted into the docking sleeve (22). The U-shaped inner mold (41) is U-shaped in general. The bottom plate of the U-shaped inner mold (41) is provided with vertical screw holes (49). The U-shaped inner mold (41) is installed and fixed on the support screw (23). The support screw (23) passes through the vertical screw holes (49). The drainage ditch side mold (43) is connected and fixed to the outer side plate of the U-shaped inner mold (41) by a tie rod (412). The tie rod (412) passes through the outer side plate of the U-shaped inner mold (41) and the transverse screw hole (410) on the drainage ditch side mold (43). The lower end of the anti-collision wall side mold (44) is fixed to the horizontal top plate (42) of the U-shaped inner mold (41); The lower end of the adjustable support rod (415) is connected to the support hook (414) on the bottom plate of the U-shaped inner mold (41), and the upper end of the adjustable support rod (415) is connected to the support hook (414) on the side mold (44) of the crash barrier. The foam caulking board (33) is installed close to the tunnel sidewall (11); The U-shaped inner mold (41), the drainage ditch side mold (43), and the anti-collision wall side mold (44) have stiffening ribs (45). The U-shaped inner mold (41), the drainage ditch side mold (43), and the anti-collision wall side mold (44) are longitudinally spliced ​​together. The two adjacent U-shaped inner molds (41), the adjacent drainage ditch side molds (43), and the two adjacent anti-collision wall side molds (44) are all fixed by extension screws (413). The extension screws (413) pass through the stiffening ribs (45) at the ends of the adjacent molds for fixing. A longitudinal joint is formed between the two adjacent U-shaped inner molds (41), the adjacent drainage ditch side molds (43), and the two adjacent anti-collision wall side molds (44). A rubber pad layer (416) is provided in the longitudinal joint. The support screw (23) is provided with an adjusting nut (24) and a fastening nut (25). The adjusting nut (24) is located below the bottom plate of the U-shaped inner mold (41), and the fastening nut (25) is located above the bottom plate of the U-shaped inner mold (41). The U-shaped inner mold (41) has a positioning rib (46) and a positioning plate (47) on its horizontal top plate (42). The lower end of the stiffening rib (45) of the anti-collision wall side mold (44) has a positioning plate (47) and a plug groove (48). The plug groove (48) on the anti-collision wall side mold (44) is inserted into the positioning rib (46) on the U-shaped inner mold (41). Seepage channels are installed on the side walls of the drainage ditch.

2. The formwork system for simultaneous casting of drainage ditch and crash barrier in tunnels according to claim 1, characterized in that, A pre-embedded sleeve (411) is fitted on the tie rod (412), and the pre-embedded sleeve (411) is located between the outer side plate of the drainage ditch side mold (43) and the U-shaped inner mold (41).

3. The formwork system for simultaneous casting of tunnel drainage ditch and crash barrier as described in claim 1, characterized in that, Foam caulking board (33) is attached to the tunnel sidewall (11) with structural adhesive.

4. A construction method for the tunnel drainage ditch and anti-collision wall synchronous casting formwork system according to any one of claims 1 to 3, characterized in that, The construction steps include the following: Step 1. Roughen the surface of the tunnel floor slab (12), and then clean the debris and concrete blocks on the tunnel floor slab (12) and the tunnel sidewalls (11); Step 2. Lay out the edge lines of the crash barrier (52) and drainage ditch (53) on the tunnel floor (12) and tunnel sidewall (11), then locate the plane position of the positioning bracket (2), and then drive the mating sleeve (22) and support screw (23) into the tunnel floor (12) according to the position of the positioning hole (21). Use structural adhesive to install and fix the foam caulking board (33) on the tunnel sidewall (11); Step 3. After the tied anti-collision wall steel cage (31) and drainage ditch steel cage (32) are transported to the construction site, align the pre-reserved butt steel bars at the lower end of the steel cage with the butt sleeve (22) and insert them into the butt sleeve (22) to complete the installation and fixing of the steel cage. Step 4. Adjust the height of the adjusting nut (24) on the support screw (23) so that the top surface elevation of the adjusting nut (24) is aligned with the bottom elevation of the drainage ditch (53). Then install the U-shaped inner mold (41). The support screw (23) passes through the vertical screw hole (49) on the U-shaped inner mold (41). The U-shaped inner mold (41) is supported on the adjusting nut (24). Then install and tighten the fastening nut (25). Step 5. Install and fix the drainage ditch side mold (43) based on the U-shaped inner mold (41). Pass the tie rod (412) through the transverse screw hole (410) on the U-shaped inner mold (41) and the anti-collision wall side mold (44) to connect and fix the drainage ditch side mold (43) to the U-shaped inner mold (41). When installing the tie bolt (412), put the pre-embedded sleeve (411) on the tie bolt (412) so that the pre-embedded sleeve (411) is located between the outer plate of the U-shaped inner mold (41) and the drainage ditch side mold (43). Step 6. Install the side mold (44) of the crash barrier based on the U-shaped inner mold (41) and fix it with the adjustable support rod (415). Insert the insertion slot (48) on the side mold (44) into the positioning rib (46) on the U-shaped inner mold (41). Connect the upper and lower ends of the adjustable support rod (415) to the support hooks (414) of the side mold (44) and the U-shaped inner mold (41) respectively. Then adjust the length of the adjustable support rod (415) to keep the side mold (44) of the crash barrier upright. Step 7. Install the U-shaped inner mold (41), drainage ditch side mold (43) and crash barrier side mold (44) segment by segment according to the methods described in Steps 4, 5 and 6. Splice the U-shaped inner mold (41), drainage ditch side mold (43) and crash barrier side mold (44) sequentially along the longitudinal direction of the tunnel. Use extension bolts (413) to fix the ends of adjacent molds, and set a rubber pad layer (416) in the joint to improve the sealing performance of the joint. Step 8. After the steel cage and formwork of the crash barrier (52) and drainage ditch (53) are installed, concrete (51) is poured. After the concrete (51) is poured, it is cured by sprinkling water. Step 9. After the concrete of the crash barrier (52) and drainage ditch (53) has been cured to the design strength, the side formwork of the drainage ditch (43), the side formwork of the crash barrier (44) and the U-shaped inner formwork (41) are removed in sequence. Then, the exposed support bolts (23) are cut off along the surface of the drainage ditch (43). After removing the tie bolts (412), the embedded sleeves (411) are cleared to ensure that the seepage channels (54) of the side wall of the drainage ditch (53) are unobstructed. After removing the U-shaped inner formwork (41), a drainage ditch (53) is formed at this position. The drainage ditch (53) is covered with a rain grate (55). Step 10. Construct the lower layer (56) and upper layer (57) of the road.

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