Box culvert formwork trolley facilitating curve segment construction and construction method

Abstract

The application discloses a box culvert formwork trolley facilitating curve segment construction and a construction method, which is formed by sequentially arranging a plurality of portal frames, and the bottom of each portal frame is supported on a bottom plate; the bottom plate is provided with rollers; a hinged mechanism is installed at the center of the bottom plate and used for guiding the adjacent portal frames in an arc shape; the portal frame is provided with a push rod, a driving device is installed at the central position of the portal frame and used for driving one end of the push rod to move horizontally, and the other end of the push rod is provided with a clamping device and used for fixing a side formwork; a supporting device is installed on the corresponding upper cross beam of the portal frame and used for supporting a top formwork. The trolley can be used for working on a straight line segment box culvert and is also suitable for building a box culvert formwork on a curve segment, and is specifically formed by a plurality of portal frames; the portal frames can be sequentially arranged and adjusted in an arc shape; the hinged mechanism between the bottom plates corresponding to the portal frames can be used for turning the bottom plates along the central point, so that the side formworks on both sides of the portal frame are guided in an arc shape after being assembled and are suitable for the curve segment construction of the box culvert.

Description

Technical Field

[0001] This invention belongs to the technical field of box culvert construction equipment, and in particular relates to a box culvert formwork trolley and construction method that facilitates the construction of curved sections. Background Technology

[0002] The water conservancy project involves urban and rural water supply and irrigation replenishment, creating conditions for the region to cope with water supply security risks and improve the ecological environment. It is divided into two major sections: water conveyance trunk line and backbone water supply. The main structures include: water diversion canal, intake culvert, wastewater cleaning bridge, forebay, intake pool, main pump house, auxiliary plant, installation room, pressure tank, outlet culvert, outlet tailrace, traffic roads, management area, etc. Among them, the top slab thickness of the intake box culvert and outlet box culvert is 900mm and 700mm respectively (including the inlet flood control and outlet flood control gate culvert sections). Both the intake box culvert and the outlet box culvert are square-section cement building layers with built-in steel reinforcement skeletons, buried below the soil layer. The specific construction steps include: construction preparation → three-axis deep mixing pile construction → well construction and foundation pit dewatering → earthwork excavation → support system erection → formwork installation → reinforcement binding → concrete pouring → earthwork backfilling.

[0003] The construction of box culverts involves first preparing the reinforced concrete base slab, then using it as a support to sequentially pour the side retaining walls and top slab. Unlike the base slab pouring process, the side retaining walls and top slab require full-span scaffolding as formwork support to form the pouring channel. Then, the reinforcing cage is tied, and finally, concrete is poured. Straight sections of box culverts can be assembled using modular scaffolding, shortening construction time and saving manpower. However, for curved sections, because the length of the horizontal bars in modular scaffolding is constant, it's difficult to adjust the spacing between the scaffolding units, making modular scaffolding less advantageous for curved sections. Furthermore, a stable support system for the formwork is a core construction process in engineering projects. Summary of the Invention

[0004] The purpose of this invention is to provide a box culvert formwork trolley and construction method that facilitates the construction of curved sections, thereby solving the problems of complicated, time-consuming and labor-intensive formwork support system construction in box culvert curved section construction.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A box culvert formwork trolley that facilitates construction on curved sections consists of multiple sets of gantry frames arranged in sequence, with the bottom of each set of gantry frames supported on a base plate. The base plate is a long strip-shaped plate structure, with rollers on both sides of the bottom. The base plate has an arc-shaped section at its center and is equipped with a hinge mechanism for guiding adjacent gantry frames through the hinge mechanism. Push rods are installed on both sides of the gantry vertical bars. A drive device is installed in the center of the gantry to drive one end of the push rod to move laterally. A clamping device is installed on the other end of the push rod to clamp and fix the side template. The upper crossbeam corresponding to the gantry is equipped with multiple sets of support devices for supporting the top formwork.

[0006] Furthermore, the roller is mounted on a wheel seat, and the base plate is provided with support parts on both sides corresponding to the wheel seat. The wheel seat and the base plate are supported by a first screw. The base plate is provided with a first threaded sleeve through which the first screw passes and is threadedly engaged. The upper end of the first screw has a first handle.

[0007] The front projection of the support part is an L-shaped structure, and ribs are provided at the corresponding corner positions.

[0008] Furthermore, the arc-shaped portions corresponding to adjacent base plates have an upper and lower staggered structure, and the arc-shaped portions corresponding to adjacent base plates respectively have hinge holes and hinge shafts.

[0009] Furthermore, the push rod is a cylindrical rod, the vertical rod of the gantry has a sleeve for the push rod to extend and retract, the driving device includes a second screw, the upper and lower ends of the second screw are rotatably connected to the gantry beam and the base plate respectively, the upper and lower sections of the screw are provided with threaded sections, the two threaded sections are fitted with second threaded sleeves, the upper and lower second threaded sleeves are provided with connecting rods between the push rods on both sides, one end of the connecting rod is hinged to the corresponding second threaded sleeve, and the other end is hinged to the corresponding push rod, and the middle of the second screw is provided with a second handle for rotating the second screw.

[0010] Furthermore, a third screw is installed on both the upper and lower sides of the gantry corresponding to the push rod. The gantry is provided with a third threaded sleeve for threaded engagement of the third screw. One end of the third screw is a third handle, and the other end is a circular washer. The clamping device includes a channel steel with a U-shaped cross-section. A fastening screw is installed on one side wall. The back of the side template has a back ridge for installation on the channel steel and for fixing with the fastening screw.

[0011] Furthermore, the support device includes a fourth screw and a sleeve that are nested together. The upper end of the fourth screw is equipped with a support groove, and the threaded section of the side wall is threaded with a fourth screw sleeve for limiting the position.

[0012] A construction method for a box culvert formwork trolley that facilitates construction on curved sections includes the following steps: Step 1: After the concrete pouring of the box culvert bottom slab is completed and completely dried, the trolley enters the site and moves downward through the first screw-driven rollers, passing the support corresponding to the bottom slab. It then moves forward using the rollers on the underside of the bottom slab, gradually adjusting the single-unit gantry according to the curved section of the box culvert. It turns through the hinge mechanism between the bottom slabs and adjusts the support angle corresponding to the single-unit gantry to make the overall movement of the trolley adapt to the curved direction of the box culvert. Step 2: Measure the distance between the vertical bars on both sides of a single gantry and the corresponding pouring troughs on both sides. Rotate the first screw to drive the rollers to retract. Use the support at the bottom of the base plate to provide more stable support for the base plate. Adjust and position the turning angle and position of the trolley corresponding to each gantry in sequence. Step 3: Rotate the second screw, and drive the push rod to move laterally through the connecting rod, so that the clamping device is close to the position of the trough to be poured. Install the side templates on both sides of the gantry according to the curvature of the box culvert section. Cut the edges of the side templates appropriately so that the gap between adjacent side templates meets the requirements of no grout leakage during pouring. Initially fix the side templates through the clamping device and position them. Step 4: Rotate the corresponding third screws on both sides of the gantry in sequence so that the end pads of the third screws contact the side template and form a support, which serves as a secondary reinforcement to improve the support strength of the side template.

[0013] Step 5: Install the top formwork. Adjust the insertion length of the fourth screw and the sleeve according to the distance of the culvert top cover pouring groove. Fine-tune the lifting distance through the fourth screw sleeve. According to the pouring requirements of the culvert top slab, cut the top formwork appropriately to meet the curve trend of the top pouring groove. The top formwork is basically a fan-shaped structure. Step Six: When multiple box culverts are poured simultaneously, each culvert is constructed at the same curve end. The box culverts are supported by the box culvert to form a pouring trough. The pre-tied steel cage is installed, and the concrete is poured. After the concrete is completely dry and under stress, the formwork is removed, the rollers are released, and the box culvert is moved to the next box culvert for construction.

[0014] The present invention has the following beneficial effects: (1) This trolley can be used for box culvert construction on straight sections and is also suitable for box culvert formwork construction on curved sections. It is composed of multiple sets of portal frames. The arc can be adjusted after the portal frames are arranged in sequence. There is a hinge mechanism between the base plates corresponding to the portal frames, which allows the base plates to turn slightly along the center point, so that the side templates on both sides of the portal frames are arc-shaped after assembly, which is suitable for the construction of curved sections of box culverts.

[0015] (2) The rollers at the bottom of the base plate are mounted on a wheel seat, and support parts are provided on both sides. The front projection of the support part is an L-shaped structure with vertical plates and horizontal plates. The horizontal plates are mainly used to increase the contact area with the ground. The two vertical plates of a single wheel seat support to form a groove. The rollers can be extended and retracted by rotating the first screw. When it is necessary to raise the gantry and use the rollers for movement, the first screw is rotated to make the rollers contact the ground. When stable support is required, the first screw can be used to support the rollers with the support parts. This not only provides high support strength and more stable support, but also reduces the wear of the roller support roller shaft. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 : Schematic diagram of the installation and connection structure of adjacent gantry sections of the present invention.

[0018] Figure 2 : Schematic diagram of the installation structure of the trolley during construction of this invention.

[0019] Figure 3 : A schematic diagram of the structure of the present invention, showing the installation of a single gantry frame in conjunction with a template.

[0020] Figure 4 : Schematic diagram of the roller mounting structure on the lower side of the base plate of this invention.

[0021] Figure 5 : A schematic diagram of the push rod end clamping device of the present invention.

[0022] The components represented by each number in the attached diagram are listed below: gantry 1, base plate 2, roller 3, push rod 4, side template 11, top template 12, support 21, first screw 31, plate rib 22, second screw 41, second screw sleeve 42, connecting rod 43, third screw 5, channel steel 6, fastening screw 61, fourth screw 7, sleeve 71, bracket 72, fourth screw sleeve 73. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] like Figures 1-3 As shown: A box culvert formwork trolley that facilitates construction of curved sections consists of multiple sets of gantry frames 1 arranged in sequence, with the bottom of each set of gantry frames 1 supported by a base plate 2; the gantry frames 1 and the base plate 2 together form a U-shaped structure.

[0025] The base plate 2 is a long strip-shaped plate structure, with rollers 3 on both sides of the bottom; each set of base plates 2 has independently supported rollers 3, which can not only serve as support but also allow for movement.

[0026] The base plate 3 has an arc-shaped section in the center and is equipped with a hinge mechanism for the adjacent gantry to be guided in an arc through the hinge mechanism; Push rods 4 are installed on both sides of the vertical rods of the gantry 1. A drive device is installed in the center of the gantry 1 to drive one end of the push rods 4 to move laterally. A clamping device is installed on the other end of the push rods 4 to clamp and fix the side template 11. Multiple sets of support devices are installed on the upper crossbeam corresponding to the gantry 1 to support the top formwork 12.

[0027] This vehicle can operate on straight sections of box culverts and is also suitable for the formwork erection of curved sections of box culverts. It consists of multiple sets of gantry frames 1. The gantry frames can be arranged in sequence and their curvature can be adjusted. There is a hinge mechanism between the base plates 2 corresponding to the gantry frames 1, which allows the base plates 2 to turn slightly around the center point, so that the side formwork on both sides of the gantry frames 2 is guided in an arc shape after assembly, which is suitable for the construction of curved sections of box culverts.

[0028] The rollers on the underside of the base plate 2 can provide the overall trolley for displacement. After the construction of a single box culvert section is completed, it can be transferred to the construction of the next box culvert section. At the same time, the rollers provide the gantry 1 with convenient steering.

[0029] Since the outer and inner arc lengths of the box culvert curves are different, while the number of side formwork 11 is the same, the width of the side formwork on both sides of the gantry 1 needs to be adjusted to ensure that the gaps between adjacent formwork after the side formwork 11 is spliced ​​are within the error range, preventing concrete slurry from leaking during the pouring process. Therefore, the side formwork and top formwork used are made of wood, which makes it easy to cut the edges and adjust the width of the wood boards. The top formwork can be cut into a fan-shaped structure according to the curvature of the box culvert curve.

[0030] like Figure 4As shown: Roller 3 is mounted on a wheel seat. Support parts 21 are provided on both sides of the base plate 2 corresponding to the wheel seat. The wheel seat and base plate 2 are supported by a first screw 31. The base plate 2 has a first threaded sleeve through which the first screw 31 passes and is threadedly engaged. The upper end of the first screw 31 has a first handle. The connection point between the wheel seat and the first screw 31 is a rotatable connection, allowing the wheel seat and roller to form a universal wheel structure, facilitating the arc-shaped steering of the gantry 1. The front projection of the support part is an L-shaped structure, with ribs 22 provided at the corresponding corner positions. The support part has vertical plates and horizontal plates. The horizontal plates are mainly used to increase the contact area with the ground. The two vertical plates of a single wheel seat support to form a groove. The ribs 22 are used to increase the strength of the support part. The first screw 31 can be rotated to extend and retract the roller 3. When it is necessary to raise the gantry 1 and move it using the roller, the first screw 31 is rotated to make the roller contact the ground. When stable support is required, the first screw 31 can be supported by the support part, which not only provides high support strength and more stable support, but also reduces the wear of the roller support roller shaft.

[0031] like Figure 1 As shown: the arc-shaped portions corresponding to adjacent base plates 2 have an offset structure, and the arc-shaped portions corresponding to adjacent base plates 2 each have a hinge hole and a hinge shaft. The hinge shaft and hinge hole are fitted together, which not only allows for small-range steering adjustments between adjacent base plates, but also serves as a connecting mechanism between various masts to form an integrated trolley.

[0032] like Figure 3 As shown: the push rod 4 is a cylindrical rod body, the vertical rod of the gantry 1 has a sleeve for the extension and retraction of the push rod 4, the driving device includes a second screw 41, the upper and lower ends of the second screw 41 are rotatably connected to the gantry crossbeam and the base plate respectively, the upper and lower sections of the second screw 41 are provided with threaded sections, and the two threaded sections are fitted with second threaded sleeves 42, the upper and lower second threaded sleeves 42 are provided with connecting rods 43 between the push rods on both sides, one end of the connecting rod 43 is hinged to the corresponding second threaded sleeve 42, and the other end is hinged to the corresponding push rod 4, and a second handle for rotating the second screw 41 is provided in the middle of the second screw 41. The four sets of connecting rods 43, when combined, form a rhomboid structure with hinged ends. The threaded sections of the upper and lower segments of the second screw 41 have opposite thread directions and are fitted with matching second threaded sleeves 42. Rotating the second screw simultaneously drives the upper and lower second threaded sleeves 42 to move closer or further apart, thereby pushing or retracting the push rod 4 to move longitudinally. The push rod moves the side templates, and the combination of multiple side templates forms the side support of the casting trough. This allows for rapid installation of the side templates.

[0033] like Figure 3As shown: A third screw 5 is installed on both the upper and lower sides of the gantry 1 corresponding to the push rod 4. The gantry 1 is equipped with a third threaded sleeve for threaded connection of the third screw 5. One end of the third screw 5 is a third handle, and the other end is a circular washer. After the push rod 4 pushes the side template to move and position, it is equivalent to the initial positioning process. Then, the third screw 5 is rotated to make the upper and lower sides of the side template also form stable support, improving the support strength of the side template 11.

[0034] like Figure 5 As shown: The clamping device includes a channel steel 6 with a U-shaped cross-section. A fastening screw 61 is installed on one side wall. The side template 11 has a back ridge on its back side for mounting to the channel steel 6 and securing it with the fastening screw 61. One end of the fastening screw is a handle, and the other end has a washer. They are divided into two groups for fixing the back ridge on the back side of the side template, facilitating the overall disassembly and installation of the side template.

[0035] The support device includes a fourth screw 7 and a sleeve 71 that are nested together. A groove 72 is installed on the upper end of the fourth screw 7, and a fourth threaded sleeve 73 for limiting the position is threaded onto the threaded section of the side wall. A back rib is also installed on the back side of the corresponding top template. Three sets of the support device are arranged along the upper crossbeam of the gantry frame to provide multi-point support for the top template. The length of the sleeve connected to the fourth screw is adjusted by rotating the fourth threaded sleeve, and support is provided through the fourth threaded sleeve. Fine adjustments can be made by rotating the fourth threaded sleeve 73 after fixing.

[0036] like Figure 2 The following is a construction method for a box culvert formwork trolley that facilitates construction on curved sections, comprising the following steps: Step 1: After the concrete pouring of the box culvert bottom slab is completed and completely dried, the trolley enters the site and drives the roller 3 to move downward through the first screw 31, passing the support part 21 corresponding to the bottom plate 2. It moves forward using the rollers on the lower side of the bottom plate 2. Corresponding to the curved section of the box culvert, the single set of gantry 1 is gradually adjusted. It turns through the hinge mechanism between the bottom plates 2 and adjusts the support angle corresponding to the single set of gantry 1 so that the overall trend of the trolley adapts to the curve of the box culvert. Step 2: Measure the distance between the vertical bars on both sides of a single gantry 1 and the corresponding pouring troughs on both sides. Rotate the first screw 31 to drive the rollers to retract. Use the support part 21 at the bottom of the base plate 2 to provide more stable support for the base plate 2. Adjust and position the turning angle and position of the trolley corresponding to each gantry 1 in sequence. Step 3: Rotate the second screw 41, and drive the push rod 4 to move laterally through the connecting rod 43, so that the clamping device is close to the position of the trough to be poured. Install the side templates 11 on both sides of the gantry 1 according to the curvature of the box culvert curve section. Cut the edges of the side templates 11 appropriately so that the gap between adjacent side templates meets the requirement of no grout leakage during pouring. Initially fix the side templates through the clamping device and position them. Step 4: Rotate the corresponding third screws 5 on both sides of the gantry 1 in sequence so that the end pads of the third screws 5 contact the side template 11 and form a support, as a secondary reinforcement to improve the support strength of the side template.

[0037] Step 5: Install the top formwork 12. Adjust the insertion length of the fourth screw 7 and the sleeve 71 according to the distance of the culvert top cover pouring groove. Fine adjust the lifting distance through the fourth screw sleeve 73. According to the pouring requirements of the culvert top slab, cut the top formwork 12 appropriately to meet the curve trend of the top pouring groove. The top formwork is basically a fan-shaped structure. Step Six: When multiple box culverts are poured simultaneously, each culvert is constructed at the same curve end. The box culverts are supported by the box culvert to form a pouring trough. The pre-tied steel cage is installed, and the concrete is poured. After the concrete is completely dry and under stress, the formwork is removed, the rollers are released, and the box culvert is moved to the next box culvert for construction.

[0038] These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims

1. A box culvert formwork trolley for easy construction of curved sections, characterized in that: It is composed of multiple sets of gantry (1) arranged in sequence, and the bottom of each set of gantry (1) is supported by a base plate (2). The base plate (2) is a long strip plate structure, and rollers (3) are provided on both sides of the bottom. The base plate (3) has an arc-shaped part in the center and is equipped with a hinge mechanism for the adjacent gantry () to be guided by the arc through the hinge mechanism; Push rods (4) are installed on both sides of the gantry (1). A drive device is installed in the center of the gantry (1) to drive one end of the push rod (4) to move laterally. A clamping device is installed on the other end of the push rod (4) to clamp and fix the side template (11). The upper crossbeam corresponding to the gantry (1) is equipped with multiple sets of support devices for supporting the top formwork (12).

2. The box culvert formwork trolley for convenient construction of curved sections according to claim 1, characterized in that: The roller (3) is mounted on a wheel seat. The base plate (2) is provided with support parts (21) on both sides of the wheel seat. The wheel seat and the base plate (2) are supported by a first screw (31). The base plate (2) is provided with a first threaded sleeve through which the first screw (31) passes and is threadedly engaged. The upper end of the first screw (31) has a first handle.

3. The box culvert formwork trolley for convenient construction of curved sections according to claim 2, characterized in that: The front projection of the support part is an L-shaped structure, and plate ribs (22) are provided at the corresponding corner positions.

4. The box culvert formwork trolley for easy construction of curved sections according to claim 1, characterized in that: The arc-shaped parts corresponding to the adjacent base plates (2) are staggered structures, and the arc-shaped parts corresponding to the adjacent base plates (2) have hinge holes and hinge shafts respectively.

5. The box culvert formwork trolley for convenient construction of curved sections according to claim 1, characterized in that: The push rod (4) is a cylindrical rod. The vertical rod of the gantry (1) has a sleeve for the push rod (4) to extend and retract. The driving device includes a second screw (41). The upper and lower ends of the second screw (41) are rotatably connected to the gantry beam and the base plate, respectively. The upper and lower sections of the second screw (41) are provided with threaded sections. The two threaded sections are fitted with second threaded sleeves (42). The upper and lower second threaded sleeves (42) are connected to the push rods on both sides with connecting rods (43). One end of the connecting rod (43) is hinged to the corresponding second threaded sleeve (42), and the other end is hinged to the corresponding push rod (4). The middle part of the second screw (41) is provided with a second handle for rotating the second screw (41).

6. The box culvert formwork trolley for convenient construction of curved sections according to claim 5, characterized in that: The gantry (1) is equipped with a third screw (5) on both the upper and lower sides corresponding to the push rod (4). The gantry (1) is provided with a third screw sleeve for the third screw (5) to be threaded. One end of the third screw (5) is a third handle, and the other end is a circular washer.

7. The box culvert formwork trolley for convenient construction of curved sections according to claim 5, characterized in that: The clamping device includes a channel steel (6), the channel steel (6) has a U-shaped cross section, and a fastening screw (61) is installed on one side wall. The back of the side template (11) has a back edge for installation on the channel steel (6) and is fixed by the fastening screw (61).

8. The box culvert formwork trolley for convenient construction of curved sections according to claim 1, characterized in that: The support device includes a fourth screw (7) and a sleeve (71) that are sleeved together. The upper end of the fourth screw (7) is equipped with a groove (72), and the threaded section of the side wall is threaded with a fourth screw sleeve (73) for limiting.

9. The construction method of a box culvert formwork trolley for convenient construction of curved sections according to claim 1, characterized in that: It includes the following steps, Step 1: After the concrete pouring of the box culvert bottom slab is completed and completely dried, the trolley enters the site and moves downward through the first screw-driven rollers, passing the support corresponding to the bottom slab. It then moves forward using the rollers on the underside of the bottom slab, gradually adjusting the single-unit gantry according to the curved section of the box culvert. It turns through the hinge mechanism between the bottom slabs and adjusts the support angle corresponding to the single-unit gantry to make the overall movement of the trolley adapt to the curved direction of the box culvert. Step 2: Measure the distance between the vertical bars on both sides of a single gantry and the corresponding pouring troughs on both sides. Rotate the first screw to drive the rollers to retract. Use the support at the bottom of the base plate to provide more stable support for the base plate. Adjust and position the turning angle and position of the trolley corresponding to each gantry in sequence. Step 3: Rotate the second screw, and drive the push rod to move laterally through the connecting rod, so that the clamping device is close to the position of the trough to be poured. Install the side templates on both sides of the gantry according to the curvature of the box culvert section. Cut the edges of the side templates appropriately so that the gap between adjacent side templates meets the requirements of no grout leakage during pouring. Initially fix the side templates through the clamping device and position them. Step 4: Rotate the corresponding third screws on both sides of the gantry in sequence so that the end pads of the third screws contact the side template and form a support, which serves as a secondary reinforcement to improve the support strength of the side template; Step 5: Install the top formwork. Adjust the insertion length of the fourth screw and the sleeve according to the distance of the culvert top cover pouring groove. Fine-tune the lifting distance through the fourth screw sleeve. According to the pouring requirements of the culvert top slab, cut the top formwork appropriately to meet the curve trend of the top pouring groove. The top formwork is basically a fan-shaped structure. Step Six: When multiple box culverts are poured simultaneously, each culvert is constructed at the same curve end. The box culverts are supported by the box culvert to form a pouring trough. The pre-tied steel cage is installed, and the concrete is poured. After the concrete is completely dry and under stress, the formwork is removed, the rollers are released, and the box culvert is moved to the next box culvert for construction.

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