Fabricated cantilever formwork and mounting method

Abstract

The invention belongs to the field of bridge lamp holder foundation pouring, and relates to an assembly type cantilever formwork and an installation method. The assembly type overhanging formwork comprises an overhanging support, a lamp holder foundation formwork and an opposite-pull screw rod. Wherein the near end of the overhanging support is installed on a bridge floor cross slope through the adjustable supporting legs so as to adapt to the gradient of the bridge floor cross slope, the balancing weight is installed at the near end of the overhanging support, and the far end of the overhanging support extends out of the bridge floor cross slope so as to be suspended; the lamp holder basic template is suspended at the far end of the overhanging bracket; the lamp holder foundation formwork is connected to the curb formwork through the opposite-pull screws, and a cavity defined by the far-end end face of the curb, the far-end end face of the prefabricated beam and the lamp holder foundation formwork is used for pouring concrete to form a lamp holder foundation. All the components are connected through bolts, turnover, mounting and dismounting are convenient, and the high-altitude operation process is shortened; the overhanging support is installed on the cross slope of the bridge floor through the adjustable supporting legs, so that the overhanging support can be adjusted to be horizontal conveniently during installation, and the overhanging support can adapt to the working conditions of different gradients or uneven bridge floors.

Description

Technical Field

[0001] The invention belongs to the field of bridge lamp holder foundation casting, and particularly relates to an assembled cantilever template and an installation method. Background Art

[0002] As a key load-bearing structure for bridge ancillary facilities, bridge lampholder foundations are often designed to be cantilevered due to space constraints imposed by the main bridge structure. These foundations are often located outside the bridge deck, necessitating the use of cantilevered trolleys or cantilevered frames for construction assistance. However, construction of bridge lampholder foundations is often carried out separately from the main beam sections. This is particularly true when the foundations are located outside the main beam deck and are large in size, resulting in fewer formwork tie points and limited operating space, leading to high construction risks.

[0003] Traditionally, lampholder foundation construction typically involves installing the formwork and support system outside the bridge deck using a hanging basket or safety work trolley. However, these only provide space for manual work and lack positioning and adjustment devices, making adjustment of the lampholder foundation formwork difficult after installation and ensuring construction accuracy. Furthermore, the installation and removal of the hanging basket and cantilevered frame are complex, posing high construction risks and hindering efficient lampholder construction and subsequent construction. Summary of the Invention

[0004] The object of the present invention is to provide an assembled cantilever formwork and an installation method to overcome the above-mentioned technical defects.

[0005] To solve the above technical problems, the present invention provides an assembled cantilever formwork suitable for casting a lamp holder foundation mounted on a precast beam, wherein the slope of the precast beam along the transverse direction of the bridge is a transverse slope of the bridge deck, a curb is provided at the distal end of the transverse slope of the bridge deck, and a curb formwork is provided on the proximal end face of the curb. The assembled cantilever formwork comprises: a cantilever bracket, wherein the proximal end of the cantilever bracket is mounted on the transverse slope of the bridge deck via an adjustable support leg to adapt to the gradient of the transverse slope of the bridge deck, a counterweight is mounted on the proximal end of the cantilever bracket, and the distal end of the cantilever bracket extends out of the transverse slope of the bridge deck to be suspended in the air; A lamp holder base template is suspended at the far end of the cantilever bracket; Tension screws, which connect the lamp holder base template to the curb template, and the cavity formed by the distal end surface of the curb, the distal end surface of the precast beam and the lamp holder base template is used for pouring concrete to form the lamp holder foundation; The distal end refers to the end close to the suspended end of the cantilever bracket; The proximal end refers to the end facing away from the free end of the cantilever bracket.

[0006] According to an assembled cantilever formwork, the cantilever bracket includes: a cantilever beam supported on the transverse slope of the bridge deck by the adjustable legs; A suspension rod is suspended at the far end of the cantilever beam to pull the lamp holder base template; The bottom cross beam is hoisted at the end of the hanger to support the lamp holder basic template.

[0007] According to an assembled cantilever template, the lamp holder base template includes: side formwork; The bottom formwork is detachably connected to the bottom surface of the side formwork, the bottom formwork is supported by the bottom cross beam, and the proximal end of the bottom formwork extends into the bottom of the precast beam so that the intersection of the two remains overlapping.

[0008] According to an assembled cantilever formwork, the distal end surface of the curbstone is flush with the distal end surface of the precast beam to serve as a mounting surface for the lamp holder reinforcement; The lamp holder steel bars are poured to form the lamp holder foundation.

[0009] According to an assembled cantilever formwork, the side formwork has at least a sub-side formwork facing the installation surface of the lamp holder reinforcement; The distal end of the tension screw passes through and is connected to the sub-side formwork; The proximal end of the tension screw passes through and is connected to the curb template.

[0010] According to an assembled cantilever formwork, the hanger includes: A front suspension rod is located close to the suspended end of the cantilever bracket, the front end of the front suspension rod is mounted on the cantilever beam, and the end of the front suspension rod is connected to the sub-side formwork; A rear suspension rod is close to the prefabricated beam, the front end of the rear suspension rod is installed on the cantilever beam, and the end of the rear suspension rod is connected to the bottom cross beam.

[0011] According to an assembled cantilever formwork, a boom mounting hole for inserting the front end of the front boom or the front end of the rear boom is opened on the cantilever beam; The boom mounting hole is an oblong hole for adjusting the position of the front boom or the rear boom.

[0012] According to an assembled cantilever formwork, the end of the rear suspension rod is connected to the bottom crossbeam after passing through the bottom formwork; Alternatively, the body of the rear suspension rod is located outside the cavity for pouring concrete to form the lamp holder foundation, and the end of the rear suspension rod is connected to the bottom cross beam.

[0013] The present invention also provides a method for installing an assembled cantilever formwork, comprising: prefabricating the counterweight; Assembling and hoisting the cantilever bracket to the transverse slope of the bridge deck, adjusting the adjustable legs to ensure a dense support between the adjustable legs and the transverse slope of the bridge deck, while keeping the cantilever bracket horizontal, and installing the counterweight at the proximal end of the cantilever bracket; Take the lamp holder base template and hang it on the far end of the cantilever bracket; Use the tension screw to connect the lamp holder foundation template to the curb template, and pour concrete into the cavity surrounded by the distal end face of the curb, the distal end face of the precast beam and the lamp holder foundation template to form the lamp holder foundation.

[0014] According to an installation method of an assembled cantilever formwork, all components are connected by bolts.

[0015] The assembled cantilever formwork proposed in the present invention uses the already cast precast beams as auxiliary anchoring points of the assembled cantilever formwork, thereby improving the anchoring performance and safety performance of the assembled cantilever formwork; the cantilever bracket is installed on the cross slope of the bridge deck by using adjustable legs, which is convenient for adjustment during installation to ensure the level of the cantilever bracket to adapt to working conditions of different slopes or uneven bridge decks, and can also be used to adjust the position of the lamp holder base formwork to improve construction accuracy; the assembled cantilever formwork can be assembled on the bridge deck in advance, and by combining bridge deck prefabrication with high-altitude assembly, the bottleneck of traditional high-altitude cast-in-place technology is broken through, reducing construction risks; prefabricated assembled concrete blocks are used as counterweights, which are convenient for installation and removal, and have high turnover efficiency, and the size and quantity of the counterweight blocks can be flexibly adjusted according to actual conditions; the components are connected by bolts, which is convenient for turnover, and the construction can achieve more refined operations, shortening the high-altitude operation process, and greatly reducing construction risks.

[0016] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic elevation diagram of the prefabricated cantilever formwork.

[0018] Figure 2 This is a schematic diagram of the application of prefabricated cantilever formwork.

[0019] Figure 3 It is the plan layout of the prefabricated cantilever formwork.

[0020] Figure 4 It is a plan view of the side mold.

[0021] Figure 5 It is a schematic elevation diagram of the side form.

[0022] Figure 6 It is a plan view of the base mold.

[0023] Figure 7 This is a schematic elevation diagram of the base mold.

[0024] Figure 8 It is a plan view of the boom.

[0025] Figure 9 It is a schematic elevation view of the adjustable legs.

[0026] Figure 10-1 This is a schematic diagram of step one of the installation method of prefabricated cantilever formwork.

[0027] Figure 10-2 This is a schematic diagram of step two of the installation method of the prefabricated cantilever formwork.

[0028] Figure 10-3 This is a schematic diagram of step three of the installation method of prefabricated cantilever formwork.

[0029] Figure 10-4 This is a schematic diagram of step four of the installation method of prefabricated cantilever formwork.

[0030] Description of reference numerals: 10. Cantilever bracket; 11. Adjustable legs; 12. Cantilever beam; 121. Hanger mounting hole; 13. Hanger; 131. Front hanger; 132. Rear hanger; 14. Bottom beam; 20. Precast beam; 21. Bridge deck slope; 22. Curbstone; 221. Curbstone formwork; 222. Curbstone reinforcement; 30. Lamp holder base template; 31. Side template; 311. Sub-side template; 32. Bottom template; 40. Tensile screw; 50. Lamp holder steel bars; 60. Counterweight. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0032] It should be noted that, in the present invention, the up, down, left and right in the figure are deemed to be the up, down, left and right of the assembled cantilever formwork described in this specification.

[0033] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so as to provide a thorough and complete disclosure of the present invention and fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0034] Unless otherwise specified, the terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have meanings consistent with the context of their relevant fields and should not be interpreted as idealized or overly formal.

[0035] This embodiment relates to an assembled cantilever formwork suitable for casting a lamp holder foundation mounted on a prefabricated beam 20. Figure 2 The slope of the precast beam 20 along the transverse direction of the bridge is the bridge deck transverse slope 21. A curb 22 is provided at the far end of the bridge deck transverse slope 21, and a curb template 221 is provided at the proximal end face of the curb 22. The curb template 221 and the curb steel bar 222 form the curb 22 after pouring.

[0036] Specifically, the prefabricated cantilever formwork is suitable for the prefabricated cantilever formwork system in which the segmental prefabricated beams and the double-sided lamp holder foundations are cast asynchronously. It is especially suitable for working conditions where ancillary structures such as cross-sea bridges and urban elevated roads require high-altitude cantilever operations.

[0037] Please combine Figure 1 and Figure 2 The assembled cantilever formwork includes a cantilever bracket 10, a lamp holder base formwork 30 and a tension screw 40. It should be noted that the distal end mentioned above and below refers to the end close to the suspended end of the cantilever bracket 10, and the proximal end refers to the end away from the suspended end of the cantilever bracket 10.

[0038] See also Figure 2 The proximal end of the cantilever bracket 10 is installed on the bridge deck transverse slope 21 through an adjustable support leg 11 to adapt to the slope of the bridge deck transverse slope 21. A counterweight block 60 is installed at the proximal end of the cantilever bracket 10, and the distal end of the cantilever bracket 10 extends out of the bridge deck transverse slope 21 to be suspended in the air.

[0039] The cantilever bracket 10 is installed on the cross slope 21 of the bridge deck using the adjustable support legs 11. The level of the cantilever bracket 10 can be ensured by adjusting the length of the adjustable support legs 11 to adapt to working conditions of different slopes or uneven bridge decks. At the same time, it is necessary to ensure that the support pads between the adjustable support legs 11 and the prefabricated beams 20 are dense to prevent instability.

[0040] The structure of the adjustable legs 11 can be referred to Figure 9 , the adjustable legs 11 achieve precise adjustment and positioning.

[0041] See also Figure 1 , the lamp holder base template 30 is hung at the far end of the cantilever bracket 10.

[0042] The counterweight 60 cooperates with the lamp holder base template 30 to maintain the balance of the cantilever bracket 10. Specifically, the size and weight of the counterweight 60 can be adjusted according to the size and weight of the lamp holder base template 30 to ensure dynamic counterweight balance.

[0043] See also Figure 2 The tension screw 40 connects the lamp holder base template 30 to the curb template 221, and the cavity formed by the distal end face of the curb 22, the distal end face of the precast beam 20 and the lamp holder base template 30 is used to pour concrete to form the lamp holder foundation.

[0044] The tensioning screw 40 ensures the anchoring of the lamp holder base template 30 in the x-direction (i.e., the length direction of the tensioning screw 40), and the cantilever bracket 10 ensures the anchoring of the lamp holder base template 30 in the y-direction. The two work together to enable the lamp holder base template 30 to be firmly positioned in the installation position, thereby ensuring the rapid and accurate installation of the assembled cantilever template, and solving the safety hazards of high-altitude operations and the problems of low construction efficiency.

[0045] In some embodiments, see Figure 1 The cantilever bracket 10 includes a cantilever beam 12, a hanger rod 13 and a bottom cross beam 14.

[0046] The cantilever beam 12 is supported on the bridge deck transverse slope 21 by the adjustable legs 11. Figure 1 or Figure 2 As shown, two adjustable legs 11 are arranged under the same cantilever beam 12 , and the levelness of the cantilever beam 12 can be ensured by adjusting the lengths of the two adjustable legs 11 .

[0047] In some embodiments, as Figure 3 As shown, two cantilever beams 12 are provided, and each cantilever beam 12 is provided with two adjustable legs 11, and the counterweight block 60 is located between the front and rear adjustable legs 11 under the same cantilever beam 12. Such a design can further ensure the levelness of the cantilever beam 12.

[0048] See also Figure 1 The hanger 13 is suspended at the far end of the cantilever beam 12 to pull the lamp holder basic template 30. The hanger 13 ensures the anchoring of the lamp holder basic template 30 in the y direction.

[0049] See also Figure 1 or Figure 2The bottom crossbeam 14 is hoisted at the end of the suspension rod 13 to support the lamp holder base template 30. Specifically, the bottom crossbeam 14 is arranged along the bridge direction. The length direction of the bottom crossbeam 14 can be considered as the z direction. At this point, the lamp holder base template 30 is supported in the x direction (the length direction of the tension screw 40), the y direction (the length direction of the suspension rod 13), and the z direction (the length direction of the bottom crossbeam 14).

[0050] See also Figure 1 or Figure 2 The lamp holder base template 30 includes a side mold 31 and a bottom mold 32.

[0051] The side mold 31 serves as a side template for the base of the lamp holder. In some embodiments, the side mold 31 may be as follows: Figure 4 and Figure 5 The shape shown, it should be noted that, Figure 4 and Figure 5 The shape shown is only an example of the side mold 31. In actual application, a suitable side mold 31 can be provided according to the shape of the lamp holder base.

[0052] like Figure 10-1 As shown, the distal end of the curb 22 is flush with the distal end of the precast beam 20, serving as the mounting surface for the lampholder reinforcement bars 50. That is, after being tied, the lampholder reinforcement bars 50 are mounted on this mounting surface, and after the reinforcement bars 50 are poured, the lampholder foundation is formed. Specifically, the mounting surface, the side formwork 31, and the bottom formwork 32 form a cavity with only the top open. The lampholder reinforcement bars 50 are accommodated within this cavity, and concrete is then poured into this cavity to form the lampholder foundation.

[0053] In order to ensure that the lamp holder foundation and the beam body of the prefabricated beam 20 are firmly consolidated, the lamp holder steel bars 50 should be well connected with the reserved steel bars of the beam body, and certain reinforcement measures can be adopted when necessary.

[0054] like Figure 1 or Figure 2 As shown, the bottom form 32 is detachably connected to the bottom surface of the side form 31, the bottom form 32 is supported by the bottom cross beam 14, and the proximal end of the bottom form 32 extends into the bottom of the precast beam 20 so that the junction of the two remains overlapping, the purpose of which is to ensure the completeness of the concrete pouring.

[0055] In some embodiments, the structure of the bottom mold 32 can refer to Figure 6 and Figure 7 It should be noted that Figure 6 and Figure 7 The shape shown is only an example of the bottom mold 32 . In actual applications, a suitable bottom mold 32 can be provided according to the shape of the lamp holder base, especially the shape of the side mold 31 .

[0056] In some embodiments, the side mold 31 and the bottom mold 32 are connected by hinges or bolts.

[0057] See also Figure 4 or Figure 5 The side mold 31 at least has a sub-side mold plate 311 facing the installation surface of the lamp holder steel bar 50. Figure 2 As shown, the distal end of the tensioning screw 40 passes through and is connected to the sub-side formwork 311, and the proximal end of the tensioning screw 40 passes through and is connected to the curbstone formwork 221. The tensioning screw 40 realizes the support of the side formwork 31 and the bottom formwork 32 in the x direction.

[0058] like Figure 2 As shown, the boom 13 includes a front boom 131 and a rear boom 132 .

[0059] The front suspension rod 131 is close to the suspended end of the cantilever bracket 10, and the front end of the front suspension rod 131 ( Figure 2 The upper end of the front suspension rod 131 is mounted on the cantilever beam 12, and the end of the front suspension rod 131 ( Figure 2 The lower end of the front suspension rod 131 shown in FIG. 1 is connected to the sub-side template 311. That is, the front suspension rod 131 pulls and supports the side template 31.

[0060] The rear suspension rod 132 is close to the precast beam 20, and the front end of the rear suspension rod 132 ( Figure 2 The upper end of the rear suspension rod 132 is mounted on the cantilever beam 12, and the end of the rear suspension rod 132 ( Figure 2 The lower end of the rear suspension rod 132 shown in FIG. 1 is connected to the bottom cross beam 14. That is, the rear suspension rod 132 pulls the bottom mold 32, and the bottom cross beam 14 lifts and supports the bottom mold 32.

[0061] At this point, the front suspension rod 131 and the rear suspension rod 132 realize the support of the side mold 31 and the bottom mold 32 in the y direction (that is, the length direction of the front suspension rod 131 or the rear suspension rod 132, the front suspension rod 131 is parallel to the rear suspension rod 132), and the bottom cross beam 14 realizes the support of the side mold 31 and the bottom mold 32 in the z direction.

[0062] See also Figure 8 A boom mounting hole 121 is provided on the cantilever beam 12 for inserting the front end of the front boom 131 or the front end of the rear boom 132 . The boom mounting hole 121 is an oblong hole for adjusting the position of the front boom 131 or the position of the rear boom 132 .

[0063] exist Figure 8 In the figure, two oblong holes are shown, which are used to install the front end of the front suspension rod 131 or the front end of the rear suspension rod 132. In addition, the cantilever beam 12 can also be used to pass the vertical tie rod. The upper end of the vertical tie rod is inserted into the reserved hole of the counterweight block 60, and the lower end of the vertical tie rod is inserted into the cantilever beam 12, and then fixed with bolts. In this way, the position of the counterweight block 60 can be adjusted and the counterweight block 60 can be prevented from sliding.

[0064] It is worth mentioning that there are two ways to install the rear suspension rod 132, namely: (1) the end of the rear suspension rod 132 is connected to the bottom cross beam 14 after passing through the bottom mold 32; or (2) the rod body of the rear suspension rod 132 is located outside the cavity for pouring concrete to form the lamp holder foundation, and the end of the rear suspension rod 132 is connected to the bottom cross beam 14.

[0065] That is, the rear suspension rod 132 may or may not pass through the bottom mold 32 .

[0066] The above-mentioned prefabricated cantilever formwork proposes technologies such as precise adjustment and positioning (adjustable support legs 11), rapid assembly and disassembly (bolt connection), and dynamic counterweight balancing (counterweight block 60), which overcome the difficulties faced in the construction of traditional lamp holder foundations, such as the difficulty in fixing the formwork, the high risk of high-altitude operations, and the lack of construction accuracy. The prefabricated beams that have been cast are used as auxiliary anchoring points of the prefabricated cantilever formwork, thereby improving the anchoring performance and safety performance of the prefabricated cantilever formwork.

[0067] This embodiment also provides a method for installing an assembled cantilever formwork, comprising: Step 100: prefabricate the counterweight 60.

[0068] Prefabricated assembled concrete blocks are used as counterweight blocks 60 in advance. Holes are reserved in the counterweight blocks 60. Vertical pull rods are passed through the reserved holes to fix the counterweight blocks 60 on the cantilever beams 12. This makes it easy to install and remove the counterweight blocks 60, has high turnover efficiency, and can flexibly adjust the size and quantity according to actual conditions.

[0069] Step 200, assemble and hoist the cantilever bracket 10 to the bridge deck cross slope 21, adjust the adjustable support leg 11 to make the support pad between the adjustable support leg 11 and the bridge deck cross slope 21 dense, while keeping the cantilever bracket 10 horizontal, and install the counterweight block 60 at the proximal end of the cantilever bracket 10.

[0070] Step 300 : Take the lamp holder base template 30 and hang it on the far end of the cantilever bracket 10 .

[0071] In step 400, use the tensioning screw 40 to connect the lamp holder base template 30 to the curb template 221, and pour concrete into the cavity surrounded by the distal end face of the curb 22, the distal end face of the precast beam 20 and the lamp holder base template 30 to form the lamp holder foundation.

[0072] In this method for installing prefabricated cantilever formwork, all components are connected via bolts. This effectively addresses the difficulties of formwork construction in traditional post-cast cantilever bridge structures, as well as the inability to quickly disassemble and recycle the formwork. This method ensures rapid and precise cantilever formwork installation, addressing safety hazards and inefficient construction during high-altitude operations. Prefabricated cantilever formwork serves not only as the main structure but also as an operating platform, allowing for reusable use, reducing material investment and risk, and can be used as a reference for all high-altitude cantilever work platforms.

[0073] Specifically, the installation method of the assembled cantilever formwork includes: Step 1, see Figure 10-1 , prefabricate assembled concrete blocks in advance as counterweight blocks 60, tie the lamp holder steel bars 50, connect the lamp holder steel bars 50 to the beam body steel bars of the prefabricated beam 20 and the curb steel bars 222, and assemble and install the cantilever bracket 10.

[0074] You can first install the adjustable support leg 11 under the cantilever beam 12, use the lifting equipment to lift the cantilever beam 12 into place, and then adjust the adjustable support leg 11 to adapt to the bridge deck cross slope 21, ensure that the support pad between the adjustable support leg 11 and the bridge deck cross slope 21 is dense, and the cantilever beam 12 is horizontal, and install the counterweight block 60 after verification.

[0075] Step 2, please refer to Figure 10-2 , install the front suspension rod 131, the rear suspension rod 132 and the bottom cross beam 14.

[0076] The front end of the front hanger 131 and the front end of the rear hanger 132 are respectively inserted into the hanger mounting holes 121 on the cantilever beam 12. The hanger mounting holes 121 are oblong holes. The positions of the front hanger 131 and the rear hanger 132 are adjusted through the oblong holes to reduce the installation error of the cantilever bracket 10. At the same time, it adapts to the construction of lamp holders with different cantilever lengths and reduces the number of cantilever brackets 10.

[0077] The bottom cross beam 14 is installed at the end of the rear suspension rod 132 by means of bolts, and the bottom cross beam 14 is arranged along the longitudinal direction of the bridge.

[0078] Step 3, please refer to Figure 10-3 , install the lamp holder basic template 30, namely the side mold 31 and the bottom mold 32.

[0079] The bottom formwork 32 is installed on the bottom cross beam 14 , the bottom formwork 32 and the side formwork 31 are connected by bolts, and the side formwork 31 is anchored to the front suspension rod 131 .

[0080] Specifically, there are two ways to connect the rear suspension rod 132 to the bottom mold 32. The first way is: first install the rear suspension rod 132, and then install the bottom crossbeam 14. At this time, there are two holes on the bottom mold 32 for the rear suspension rod 132 to pass through (such as Figure 6As shown); the second method is: first install the rear suspension rod 132, install the bottom cross beam 14 at the end of the rear suspension rod 132, and then install the bottom mold 32. At this time, there is no hole on the bottom mold 32 because the rear suspension rod 132 is set on both sides of the side mold 31.

[0081] Step 4, please refer to Figure 10-4 The side formwork 31 and curb formwork 221 are connected by tensioning screws 40 to achieve horizontal anchoring, prevent formwork expansion, and reduce construction risks. After the formwork is installed, concrete is poured into the cavity formed by the distal end face of the curb 22, the distal end face of the precast beam 20, and the lamp holder base formwork 30 to form the lamp holder foundation.

[0082] When the concrete reaches the designed strength, the prefabricated cantilever formwork is removed.

[0083] It should be noted that Figures 10-1 to 10-4 , is only an example of the installation process of the lamp holder foundation template 30. After the installation is completed, concrete can be poured to form the lamp holder foundation, and the curb 22 and the curb template 221 are only used as anchoring instructions. It can be considered that the curb 22 has been poured in advance, or the curb 22 and the lamp holder foundation are poured at the same time.

[0084] Since the bottom form 32 and the side form 31 are connected by a hinge structure, the bottom form 32 can be quickly demolded by loosening the rear suspension rod 132, avoiding the need for manual high-altitude removal of the bottom form 32. Therefore, this assembled cantilever formwork solves the problems of formwork construction in traditional bridge post-cast cantilever structures and the inability to quickly disassemble and recycle the formwork. It effectively ensures the rapid and accurate installation of the cantilever formwork and solves the safety hazards and low construction efficiency problems of high-altitude operations. The assembled cantilever formwork can serve as both the main structure and the operating platform, and can be used in a cyclical manner, reducing material investment and risks. It can be used as a reference for all high-altitude cantilever work platforms.

[0085] It should be noted that when a protruding structure such as a curb 22 is used for horizontal anchoring, auxiliary anchoring can be performed by pre-embedded anchor points in the bridge deck beam.

[0086] Since all components are connected by bolts, the assembled cantilever formwork is easy to turn around, allowing for more precise construction operations, shortening the high-altitude work process, and greatly reducing construction risks, thereby improving the overall work efficiency of lamp holder construction.

[0087] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An assembled cantilever formwork suitable for casting a lamp holder foundation mounted on a precast beam (20), wherein the slope of the precast beam (20) along the transverse bridge direction is a bridge deck transverse slope (21), a curb (22) is provided at the distal end of the bridge deck transverse slope (21), and a curb formwork (221) is provided at the proximal end face of the curb (22), characterized in that: Prefabricated cantilever formwork includes: A cantilever bracket (10), wherein the proximal end of the cantilever bracket (10) is mounted on the bridge deck transverse slope (21) via an adjustable support leg (11) to adapt to the gradient of the bridge deck transverse slope (21), a counterweight (60) is mounted on the proximal end of the cantilever bracket (10), and the distal end of the cantilever bracket (10) extends beyond the bridge deck transverse slope (21) to be suspended in the air; A lamp holder base template (30) is suspended at the distal end of the cantilever bracket (10); a tensioning screw (40), wherein the tensioning screw (40) connects the lamp holder base template (30) to the curb template (221); a cavity formed by the distal end surface of the curb (22), the distal end surface of the precast beam (20), and the lamp holder base template (30) is used for pouring concrete to form the lamp holder foundation; The distal end refers to the end close to the suspended end of the cantilever bracket (10); The proximal end refers to the end facing away from the suspended end of the cantilever bracket (10).

2. The assembled cantilever formwork according to claim 1, characterized in that: The cantilever bracket (10) comprises: A cantilever beam (12) is supported on the bridge deck transverse slope (21) via the adjustable support legs (11); A suspension rod (13) is suspended at the distal end of the cantilever beam (12) to pull the lamp holder base template (30); A bottom crossbeam (14) is hoisted at the end of the suspension rod (13) to support the lamp holder base template (30).

3. The assembled cantilever formwork according to claim 2, characterized in that: The lamp holder basic template (30) comprises: Side mold (31); A bottom mold (32) is detachably connected to the bottom surface of the side mold (31), the bottom mold (32) is supported by the bottom cross beam (14), and the proximal end of the bottom mold (32) extends into the bottom of the precast beam (20) so that the intersection of the two remains overlapping.

4. The assembled cantilever formwork according to claim 3, characterized in that: The distal end surface of the curbstone (22) is flush with the distal end surface of the prefabricated beam (20) to serve as a mounting surface for the lamp holder steel bar (50); The lamp holder steel bars (50) are cast to form the lamp holder foundation.

5. The assembled cantilever formwork according to claim 4, characterized in that: The side formwork (31) at least has a sub-side formwork (311) facing the installation surface of the lamp holder steel bar (50); The distal end of the tension screw (40) passes through and is connected to the sub-side formwork (311); The proximal end of the tension screw (40) passes through and is connected to the curb template (221).

6. The assembled cantilever formwork according to claim 5, characterized in that: The boom (13) comprises: A front suspension rod (131) is located close to the suspended end of the cantilever bracket (10), the front end of the front suspension rod (131) is mounted on the cantilever beam (12), and the end of the front suspension rod (131) is connected to the sub-side formwork (311); A rear suspension rod (132) is located close to the prefabricated beam (20), a front end of the rear suspension rod (132) is mounted on the cantilever beam (12), and a distal end of the rear suspension rod (132) is connected to the bottom cross beam (14).

7. The assembled cantilever formwork according to claim 6, characterized in that: A suspension rod mounting hole (121) is provided on the cantilever beam (12) for inserting the front end of the front suspension rod (131) or the front end of the rear suspension rod (132); The suspension rod mounting hole (121) is an oblong hole for adjusting the position of the front suspension rod (131) or the position of the rear suspension rod (132).

8. The assembled cantilever formwork according to claim 6, characterized in that: The end of the rear suspension rod (132) is connected to the bottom crossbeam (14) after passing through the bottom mold (32); Alternatively, the body of the rear suspension rod (132) is located outside the cavity for pouring concrete to form the lamp holder foundation, and the end of the rear suspension rod (132) is connected to the bottom cross beam (14).

9. A method for installing an assembled cantilever formwork, using the assembled cantilever formwork according to any one of claims 1 to 8, characterized in that: include: Prefabricating the counterweight block (60); Assembling and hoisting the cantilever bracket (10) to the bridge deck transverse slope (21), adjusting the adjustable support leg (11) so that the support pad between the adjustable support leg (11) and the bridge deck transverse slope (21) is dense, while keeping the cantilever bracket (10) horizontal, and installing the counterweight (60) at the proximal end of the cantilever bracket (10); The lamp holder base template (30) is hung on the far end of the cantilever bracket (10); The tension screw rod (40) is used to connect the lamp holder foundation template (30) to the curb template (221), and concrete is poured into a cavity surrounded by the distal end surface of the curb (22), the distal end surface of the precast beam (20), and the lamp holder foundation template (30) to form the lamp holder foundation.

10. The method for installing the assembled cantilever formwork according to claim 9, characterized in that: All components are connected by bolts.

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