A method for constructing a precast pier body

Abstract

The application discloses a prefabricated pier body construction method, relates to the technical field of prefabricated structure construction, and mainly comprises the following steps: firstly, a prefabricated pier steel reinforcement cage is processed and manufactured; then, a pier body formwork is spliced on a transport vehicle, and the steel reinforcement cage is loaded and sealed; after the formwork is installed, the tail of the vehicle is connected to a turnover rack through a hinged member and is fixed, the turnover rack is connected to the bottom of the formwork, the transport vehicle carries the turnover rack to a designated area, a crane is used to turn the formwork around the hinged member to be vertical; then, concrete pouring and maintenance are carried out; after the maintenance is completed, the transport vehicle and the turnover rack are re-hinged, the prefabricated pier is turned to be horizontal by the crane and is transported to a construction site for installation. According to the construction method, the operation steps of needing to be suspended for many times in the traditional process are optimized through the cooperation of the transport vehicle and the turnover rack, the construction risk that the structure is prone to shaking in the prefabricated production is avoided, and the construction safety and efficiency are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated structure construction, and particularly relates to a prefabricated pier body construction method. BACKGROUND

[0002] In the construction of viaducts, the traditional method of manufacturing bridge piers is to cast on site, which has a long construction period and can cause long-term impact on the original traffic, and the construction noise can also affect nearby residents, which is obviously disadvantageous. Therefore, the method of prefabricating concrete structures in a factory and then transporting the prefabricated structures to the construction site for installation is increasingly popular.

[0003] For the prefabrication of pier bodies of viaducts, the conventional construction method generally includes the steps of manufacturing a reinforcement cage, sealing a formwork, pouring concrete, removing the formwork, curing the concrete, and transporting and installing the prefabricated pier body at the construction site. The steps involve two overturning operations. The first overturning operation is to overturn the horizontally placed pier body formwork to a vertical state for pouring concrete, and the second overturning operation is to overturn the cured and vertically placed pier body to a horizontal state for transportation.

[0004] Both of the two overturning operations need to first suspend the pier body formwork or the prefabricated pier by a gantry crane or a crane, place it on a specific overturning table, and then gradually overturn the pier body formwork or the prefabricated pier to a vertical or horizontal state by cooperating with the overturning table. However, due to the large volume and weight of the concrete prefabricated pier, precise cooperation of multiple devices and manpower is required during each suspension process, otherwise unbalanced shaking of the pier body formwork or the prefabricated pier during suspension is likely to occur, which can cause the steel reinforcement and cushion blocks inside the pier body formwork to shift, affecting the structural strength and quality of the prefabricated pier during subsequent pouring, and can cause the prefabricated pier to be bumped, damaging its appearance and subsequent performance. More seriously, the shaking can also cause the overturning to be out of position and overturn, posing a serious threat to the safety of construction personnel and equipment.

[0005] Therefore, it is necessary to improve the construction method of the prefabricated pier body and optimize the transportation and suspension procedures of the pier body formwork and the prefabricated pier in the traditional process to ensure the safety and reliability of the prefabricated pier body process in the factory. SUMMARY

[0006] The purpose of the present application is to solve the problem of multiple suspension steps in the prefabricated pier body construction process in the prior art, which has a high construction risk and low efficiency, and to provide a prefabricated pier body construction method.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] A prefabricated pier body construction method, the main steps of which include:

[0009] Step S1, steel bar cage manufacturing; according to the drawing requirements, the steel bar manufacturing area is processed and manufactured into a prefabricated pier steel bar cage;

[0010] Step S2, pier body template manufacturing; the template is spliced on the transport vehicle, the template bottom is flush with the transport vehicle tail, the steel bar cage is installed into the template and the template is sealed, the pier body template manufacturing is completed, the pier body template is horizontally placed on the transport vehicle, and the pier body template is fixed on the transport vehicle;

[0011] Step S3, installation of the turnover rack; after the template is installed, the turnover rack is connected through the hinge member at the tail of the transport vehicle, and the turnover rack is turned around the hinge part to be attached to the lower surface of the pier body template bottom, and the turnover rack is fixedly connected with the pier body template bottom through the connecting member;

[0012] Step S4, pier body template turnover; the pier body template is transported to the pouring and storage area through the transport vehicle, the hinge member is aligned with the elevation of the ground of the pouring and storage area, and the fixing of the pier body template on the transport vehicle is released; the crane enters the field, the hook is connected to the upper part of the pier body template, and is lifted upward, so that the pier body template is turned around the hinge member at the tail of the transport vehicle to be vertical, and is placed vertically together with the turnover rack in the pouring and storage area; then the connection part of the turnover rack and the transport vehicle is disconnected, and the transport vehicle is driven away;

[0013] Step S5, concrete pouring and curing; according to the drawing requirements, the concrete is poured and cured;

[0014] Step S6, prefabricated pier turnover; after the prefabricated pier is cured, the transport vehicle is moved to the pouring and storage area, the sleepers are laid on the transport vehicle, and the tail of the transport vehicle is re-hinged with the turnover rack; the quick-release limiting assembly is installed on the turnover rack and abuts against the lower part of the prefabricated pier, the crane enters the field, the vertically placed prefabricated pier is turned around the hinge member at the tail of the transport vehicle, and is placed horizontally on the sleepers, and the prefabricated pier is fixed on the transport vehicle;

[0015] Step S7, moving and transporting the prefabricated pier to the construction site and turning over and installing; the prefabricated pier is transported to the construction site to be installed through the transport vehicle; the crane enters the field, the hook is connected to the upper part of the prefabricated pier, and is lifted upward, so that the prefabricated pier is turned around the hinge member at the tail of the transport vehicle to be vertically suspended, after the quick-release limiting assembly at the bottom of the prefabricated pier and the turnover rack are removed, the prefabricated pier is installed and constructed.

[0016] Further, in step S2, the transport vehicle comprises a frame, a traction frame installed at the head of the frame, and a support block installed at the tail of the frame, a rotating shaft is installed on the support block, the rotating shaft is the articulated member in steps S3, S4, S6, and S7, and both ends of the rotating shaft are respectively slidably sleeved with guide forks which can slide along the axial direction of the rotating shaft and rotate around the rotating shaft, and limiters are arranged on the guide forks.

[0017] Further, at least two hydraulic adjustable length footings are further installed on both sides of the tail of the frame, and the support strength of the footings should be not less than the total weight of the pier body formwork and the prefabricated pier.

[0018] The further detailed process of step S2 is as follows:

[0019] In step S21, the pier body formwork adopts a large block combined shaped steel formwork, the inner wall of the pier body formwork is first polished and brushed, and a release agent is brushed;

[0020] In step S22, a plurality of sleepers are laid on the transport vehicle;

[0021] In step S23, one side wall formwork of the pier body formwork is first placed and spliced on the sleepers, the corresponding formwork at the bottom of the prefabricated pier is aligned and leveled at the tail of the transport vehicle, and concrete pads are uniformly installed on the inner wall of the formwork;

[0022] In step S24, the steel reinforcement cage which has been completed in step S1 is placed on the side wall formwork in step S23, and the relative position is adjusted;

[0023] In step S25, the formworks of the other three side walls are installed, the concrete pads are uniformly laid between the inner wall of the formwork and the steel reinforcement, the formworks of the remaining side walls are tightly spliced, and the mold is sealed;

[0024] In step S26, the pier body formwork is fixed on the transport vehicle.

[0025] Further, in step S3, the turnover rack is made of high-strength steel, a plurality of screw holes are arranged on the upper surface of the turnover rack, a plurality of guide holes which are matched with the size of the guide fork are uniformly arranged on the side surface of the turnover rack, and a lifting rod for connecting with the hook of the crane is installed at each side end of the turnover rack.

[0026] The further detailed process of step S3 is as follows:

[0027] In step S31, the guide fork at the tail of the transport vehicle is placed flat, the position of the guide fork is adjusted according to the size of the turnover rack, and then the guide fork is inserted into the guide hole in the side surface of the turnover rack until the turnover rack abuts against the limiter, and the limiter is fixed on the turnover rack through bolts;

[0028] In step S32, the upper surface of the turnover rack is polished and brushed, and a release agent is brushed;

[0029] Step S33, rotate the turnover rack inserted on the guide fork around the rotating shaft until the upper surface of the turnover rack is attached to the bottom of the pier formwork;

[0030] Step S34, use the screw rod and bolt to connect the bottom of the pier formwork and the turnover rack, and fix the turnover rack on the bottom of the pier formwork.

[0031] The further detailed process of step S4 is as follows:

[0032] Step S41, connect the transport vehicle with the driving vehicle head through the traction frame, drive the transport vehicle with the driving vehicle head, and transport the pier formwork to the pouring and storage area;

[0033] Step S42, place the jack under the tail support block of the transport vehicle, and jack up the tail of the transport vehicle until the rotating shaft is aligned with the ground elevation of the pouring and storage area;

[0034] Step S43, open the foot of the tail of the transport vehicle to support the transport vehicle against the ground;

[0035] Step S44, release the fixation of the pier formwork and the transport vehicle;

[0036] Step S45, the crane enters the field, the hook connects the upper part of the pier formwork and lifts upward, so that the pier formwork and the turnover rack are turned around the rotating shaft until the bottom of the turnover rack contacts the ground of the pouring and storage area and the pier formwork is vertical;

[0037] Step S46, release the connection between the turnover rack and the stopper, drive the transport vehicle away in the opposite direction of the pouring and storage area, and make the guide fork and the turnover rack separate.

[0038] Further, in step S6, the quick-release limiting assembly includes a base and a limiting plate which are integrally formed and perpendicular to each other, the base is provided with a guide groove, and the limiting plate is provided with a fixing piece which reserves a plug-in limiting tube hole.

[0039] The further detailed process of step S6 is as follows:

[0040] Step S61, after the maintenance of the prefabricated pier is completed, move the transport vehicle to the pouring and storage area, place the guide fork flat and insert it into the guide hole on the side of the turnover rack until the turnover rack is against the stopper, fix the stopper on the turnover rack through the bolt, and open the foot to support the transport vehicle;

[0041] Step S62, cover the sponge pad under the prefabricated pier, align the guide groove on the quick-release limiting component base with the screw hole on the turnover rack, adjust the position of the quick-release limiting component until the limiting plate extrudes the sponge pad and closely adheres to the surface of the prefabricated pier, use the screw rod to rotate into the guide groove and the screw hole on the turnover rack, and fix the quick-release limiting component on the turnover rack; the quick-release limiting component is at least four, and is fixed on the four sides of the lower part of the prefabricated pier respectively;

[0042] Step S63, insert the limiting tube into the fixing sheet on each limiting plate, and lock the two limiting tubes perpendicular to each other through the pipe clamp;

[0043] Step S64, evenly place several sleepers on the transport vehicle;

[0044] Step S65, the crane enters the field, selects a main crane and an auxiliary crane, the main crane hook connects the jib away from the side of the transport vehicle of the turnover rack, the auxiliary crane connects the upper part of the prefabricated pier, the main crane hook lifts, the jib is lifted upwards, drives the turnover rack and the prefabricated pier to overturn around the rotating shaft, and the gravity of the prefabricated pier is gradually distributed to the auxiliary crane during the overturning process, until the prefabricated pier is horizontally overturned and placed horizontally on the sleepers;

[0045] Step S66, fix the prefabricated pier on the transport vehicle.

[0046] The application has the following beneficial effects:

[0047] In the pier body formwork manufacturing stage, the mold closing operation is directly completed on the transport vehicle, and the turnover rack is directly installed at the bottom of the pier body formwork, thereby providing stable support for subsequent overturning operation; in the prefabricated pier pouring and storage stage, the pier body formwork is moved to the storage area for overturning through the transport vehicle, thereby reducing the step of suspending the pier body formwork to the turnover rack in the traditional construction, the pier body formwork does not need to be suspended and lifted, and the safety during the moving process is ensured; in the pier body construction stage, the transport vehicle is reconnected with the turnover rack, and the quick-release limiting component is installed at the bottom of the pier body, thereby realizing the stable overturning of the pier body, and further reducing the step of suspending the prefabricated pier to the turnover rack in the traditional construction. The optimization of the above construction process avoids the process of suspending the pier body formwork or the prefabricated pier in the traditional method, significantly reduces the construction risk, and further improves the safety and efficiency of the construction. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 It is a whole connection schematic diagram of each structure in step S3 of the prefabricated pier body construction method of the application;

[0049] Figure 2 It is a turnover process schematic diagram in step S4 of the prefabricated pier body construction method of the application;

[0050] Figure 3 This is a schematic diagram of the overall structure of the transport vehicle in a precast pier construction method of the present invention;

[0051] Figure 4 This is a schematic diagram of the overall structure of the tilting platform in a precast pier construction method of the present invention;

[0052] Figure 5 This is a schematic diagram of the connection structure between the precast pier and the tilting platform in a precast pier construction method of the present invention.

[0053] In the attached diagram: 1. Pier body formwork; 2. Precast pier; 3. Transport vehicle; 31. Frame; 32. Traction frame; 33. Support block; 34. Rotating shaft; 35. Guide fork; 36. Limiter; 37. Anchor; 4. Tilting platform; 41. Guide hole; 42. Lifting rod; 43. Quick-release limit assembly; 431. Base; 432. Limiting plate; 433. Guide groove; 434. Fixing plate; 435. Limiting tube; 436. Pipe clamp; Detailed Implementation

[0054] The technical solution of the present invention will now be described with reference to the accompanying drawings. However, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that in the description of this invention, terms such as "upper" and "lower" indicating directional or positional relationships are based on the directional or positional relationships shown in the accompanying drawings, for example... Figure 2 This describes the placement of each piece of equipment under normal operating conditions. The description of the pier body and the upper and lower parts of the pier body template 1 in this invention is also based on... Figure 2 The vertical orientation of the pier body and the pier body template 1 is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0056] First, the precast pier construction method of the present invention divides the precast plant site into: a rebar fabrication area, a formwork sealing area, and a pouring and storage area. In the embodiment: step S1, rebar cage fabrication, is completed in the rebar fabrication area; steps S2-S3, formwork fabrication and installation of the turning platform are completed in the formwork sealing area; steps S4-S5, turning, pouring, and curing, are completed in the pouring and storage area. Furthermore, the pier formwork 1 mentioned throughout this text refers to the forming formwork of the precast pier 2. (Refer to...) Figures 1-5 This invention discloses a method for constructing precast piers, and includes the specific structure of the auxiliary equipment used in this method. The construction method includes the following steps:

[0057] Step S1, fabrication of reinforcement cage; according to the drawing requirements of the concrete precast pier 2, the reinforcement cage is processed and fabricated in the reinforcement fabrication area;

[0058] Step S2, fabrication of pier body formwork 1; the formwork is spliced on the transport vehicle 3, the bottom of the formwork is flush with the tail of the transport vehicle 3, the reinforcement cage is installed into the formwork and the formwork is sealed, the fabrication of the pier body formwork 1 is completed, the pier body formwork 1 is horizontally placed on the transport vehicle 3, and the pier body formwork 1 is fixed on the transport vehicle 3;

[0059] Step S3, installation of turnover rack 4; after the formwork is installed, the turnover rack 4 is connected to the tail of the transport vehicle 3 through the hinged member, and the turnover rack 4 is turned around the hinged part to be in contact with the lower surface of the bottom of the pier body formwork 1, and the turnover rack 4 is fixedly connected with the bottom of the pier body formwork 1 by using connecting members such as bolts and screws;

[0060] Step S4, turnover of pier body formwork 1; the pier body formwork 1 is transported to the pouring and storage area by the transport vehicle 3, the elevation of the hinged member is aligned with the elevation of the ground of the pouring and storage area, the fixation of the pier body formwork 1 on the transport vehicle 3 is released, the crane is on site, the hook is connected to the upper part of the pier body formwork 1, and is lifted upward, so that the pier body formwork 1 is turned vertically around the hinged member at the tail of the transport vehicle 3, and is placed vertically together with the turnover rack 4 in the pouring and storage area; then the connection part of the turnover rack 4 and the transport vehicle 3 is disconnected, and the transport vehicle 3 is driven away;

[0061] Step S5, concrete pouring and curing; according to the drawing requirements, the concrete is poured and cured;

[0062] After the concrete is mixed, it is transported to the pier body formwork 1 to be poured by a concrete transport bucket, the pouring is performed by using a gantry feeding hopper, and the concrete is poured layer by layer, and artificial vibration is used during the pouring process; when the concrete strength reaches 75% of the design strength standard value and the specification requirements, the formwork is removed, and the precast pier 2 is wrapped with geotextile and canvas in sequence for concrete curing;

[0063] Step S6, turnover of precast pier 2; after the precast pier 2 is cured, the transport vehicle 3 is moved to the pouring and storage area, the transport vehicle 3 is laid on sleepers, and the tail of the transport vehicle 3 is re-hinged with the turnover rack 4; the quick-release limiting assembly 43 is installed on the turnover rack 4 and abuts against the lower part of the precast pier 2, the crane is on site, the vertically placed precast pier 2 is turned around the hinged member at the tail of the transport vehicle 3, and is placed horizontally on the sleepers, and the precast pier 2 is stably placed on the transport vehicle 3;

[0064] Step S7, moving the prefabricated pier 2 to the construction site and installing by overturning; the prefabricated pier 2 is transported to the installation position at the construction site by the transport vehicle 3; the prefabricated pier 2 is fixed on the transport vehicle 3, the crane is put into the field, the hook is connected to the upper part of the prefabricated pier 2, and the prefabricated pier 2 is lifted upward to overturn around the hinge member at the tail of the transport vehicle 3 to be vertically hung, and after the quick disassembly limiting assembly 43 at the bottom of the prefabricated pier 2 and the overturning rack 4 are removed, the prefabricated pier 2 is installed and constructed.

[0065] In the actual construction process, the flexible use of the transport vehicle 3 is the key to the efficient implementation of the whole construction method. Especially in steps S4 and S6, the transport vehicle 3 is used in cooperation with the overturning rack 4 to move and overturn the pier body formwork 1 and the prefabricated pier 2, without the need to suspend and hoist the pier body formwork 1 and the prefabricated pier 2 multiple times, so that the smooth overturning of the pier body formwork 1 and the prefabricated pier 2 between the horizontal and vertical states can be realized, which greatly reduces the construction risk and optimizes the construction process. In addition, compared with the traditional process, the prefabricated pier 2 needs to be welded with a limiting bracket at the bottom before overturning, which is time-consuming and laborious and difficult to control. The present application further installs a quick disassembly limiting assembly 43 at the bottom of the prefabricated pier 2, which not only ensures the stability of the prefabricated pier 2 during overturning and moving, but also further improves the construction efficiency.

[0066] Further, as shown in Figure 3 Step S2, the transport vehicle 3 includes a frame 31, a traction frame 32 installed at the head of the frame 31, and a support block 33 installed at the tail of the frame 31, a rotating shaft 34 is installed on the support block 33, the rotating shaft 34 is the hinge member mentioned in steps S3, S4, S6 and S7, and guide forks 35 that can slide axially along the rotating shaft 34 and rotate around the rotating shaft 34 are respectively sleeved at both ends of the rotating shaft 34, and limiters 36 are arranged on the guide forks 35.

[0067] Further, at least two hydraulic footings 37 are installed on both sides of the tail of the frame 31, and the support strength of the footings 37 should not be less than the total weight of the pier body formwork 1 and the prefabricated pier 2.

[0068] The further detailed process of step S2 is as follows:

[0069] Step S21, the pier body formwork 1 adopts a large block combined shaped steel formwork, first polish the inner wall of the pier body formwork 1, and then brush release agent;

[0070] Step S22, laying several sleepers on the transport vehicle 3, the height of the sleepers can be just enough to make the pier body formwork 1 horizontally placed parallel to the ground;

[0071] Step S23, first place one side wall template of the pier body template 1 on the sleeper, align the template corresponding to the bottom of the prefabricated pier 2 with the tail of the transport vehicle 3, and evenly install concrete pads on the inner wall of the template;

[0072] Step S24, place the steel reinforcement cage made in step S1 on the side wall template in step S23 and adjust the relative position;

[0073] Step S25, install the templates of the other three side walls, evenly lay concrete pads between the inner wall of the template and the steel reinforcement, tightly splice the templates of the remaining side walls, and seal the mold;

[0074] Step S26, and fix the pier body template 1 on the transport vehicle 3.

[0075] Further, as shown in Figure 4 Step S3, the turnover rack 4 is made of high-strength steel, and a plurality of screw holes are formed on the upper surface of the turnover rack 4, and a plurality of guide holes 41 matching the size of the guide fork 35 are uniformly formed on the side surface of the turnover rack 4; the turnover rack 4 is provided with a lifting rod 42 on both sides for connecting with the lifting hook of the crane.

[0076] The further detailed process of step S3 is as follows:

[0077] Step S31, place the guide fork 35 at the tail of the transport vehicle 3, adjust the position of the guide fork 35 according to the size of the turnover rack 4, and then insert the guide fork 35 into the guide hole 41 on the side surface of the turnover rack 4 until the turnover rack 4 abuts against the stopper 36, and then fix the stopper 36 to the turnover rack 4 by bolts;

[0078] Step S32, polish the upper surface of the turnover rack 4 and apply release agent;

[0079] Step S33, rotate the turnover rack 4 inserted on the guide fork 35 around the rotating shaft 34 until the upper surface of the turnover rack 4 is attached to the bottom of the pier body template 1;

[0080] Step S34, use a screw rod and bolts to connect the bottom of the pier body template 1 and the turnover rack 4, and fix the turnover rack 4 to the bottom of the pier body template 1.

[0081] By installing rotating shaft 34 and guide fork 35 at the tail of transport vehicle 3, guide fork 35 can be accurately inserted into guide hole 41 on the side of overturning rack 4, and the stable connection between overturning rack 4 and transport vehicle 3 is realized by means of stopper 36; overturning rack 4 is attached to the bottom of pier body template 1 and is fastened to each other, which cooperates to fix pier body template 1 on transport vehicle 3, further enhancing the stability of the overall structure in the subsequent overturning process, thereby ensuring construction safety and efficiency. In addition, guide fork 35 is sleeved on rotating shaft 34, and the positions of multiple guide forks 35 can be flexibly adjusted to adapt to overturning rack 4 with different spacing guide holes 41.

[0082] The further detailed process of step S4 is as follows:

[0083] Step S41, transport vehicle 3 is connected with drive car head through traction frame 32, drive car head drives transport vehicle 3 to transport pier body template 1 to pouring and storage area;

[0084] Step S42, jack is placed below support block 33 at the tail of transport vehicle 3, jack jacks up the tail of transport vehicle 3 until rotating shaft 34 is aligned with the ground elevation of pouring and storage area;

[0085] Step S43, opening the foot 37 at the tail of transport vehicle 3, so that it supports transport vehicle 3 against the ground;

[0086] Step S44, release the fixation of pier body template 1 and transport vehicle 3;

[0087] Step S45, crane enters the scene, hook connects the upper part of pier body template 1 and lifts upward, so that pier body template 1 and overturning rack 4 rotate around rotating shaft 34 until the bottom of overturning rack 4 contacts the ground of pouring and storage area and pier body template 1 is vertical;

[0088] Step S46, release the connection between overturning rack 4 and stopper 36, drive transport vehicle 3 away from pouring and storage area in the opposite direction, so that guide fork 35 is separated from overturning rack 4.

[0089] For different elevations of pouring and storage area, by matching jack and foot 37, the elevation of rotating shaft 34 can be adjusted to the same height as the pouring and storage area, so that the overturning process can adapt to more scenes. The use of foot 37 can transfer part of the gravity of pier body template 1 to foot 37 during the overturning process, thereby avoiding the risk of transport vehicle 3 head lifting and structural instability due to the gravity of pier body template 1 transferring to the tail of transport vehicle 3.

[0090] Further, as Figure 5As shown, in step S6, the quick-release limiting assembly 43 comprises a base 431 and a limiting plate 432 integrally formed in L shape, the base 431 is provided with a guide groove 433 with the same width as the screw hole on the turnover rack 4, and the limiting plate 432 is provided with a fixing piece 434 capable of inserting the limiting tube 435.

[0091] The further detailed process of step S6 is as follows:

[0092] In step S61, after the prefabricated pier 2 is maintained, the transport vehicle 3 is moved to the pouring and storage area, the guide fork 35 is placed flat and inserted into the guide hole 41 on the side of the turnover rack 4 until the turnover rack 4 abuts against the limiter 36, the limiter 36 is fixed with the turnover rack 4 through bolts, and the foot 37 is opened to support the transport vehicle 3;

[0093] In step S62, the lower part of the prefabricated pier 2 is covered with a sponge pad, the guide groove 433 on the base 431 of the quick-release limiting assembly 43 is aligned with the screw hole on the turnover rack 4, the position of the quick-release limiting assembly 43 is adjusted until the limiting plate 432 extrudes the sponge pad and closely adheres to the surface of the prefabricated pier 2, the screw rod is screwed into the guide groove 433 and the screw hole on the turnover rack to fix the quick-release limiting assembly 43 on the turnover rack 4; the quick-release limiting assembly 43 is at least four, which are respectively fixed on the four sides of the lower part of the prefabricated pier 2;

[0094] In step S63, the limiting tube 435 is inserted into the fixing piece 434 on each limiting plate 432, and the two limiting tubes 435 perpendicular to each other are locked by the pipe clamp 436;

[0095] In step S64, a plurality of sleepers are placed on the transport vehicle 3, and the height of the sleepers is just enough to allow the prefabricated pier 2 to be placed horizontally after subsequent turnover;

[0096] In step S65, the crane enters the scene, one main crane and one auxiliary crane are selected, the hook of the main crane is connected to the boom 42 on the side of the turnover rack 4 away from the transport vehicle 3, the auxiliary crane is connected to the upper part of the prefabricated pier 2, the hook of the main crane lifts the boom 42, drives the turnover rack 4 and the prefabricated pier 2 to turn around the rotating shaft 34, the auxiliary crane synchronously adjusts the tension to bear the gravity of the prefabricated pier 2, until the prefabricated pier 2 is horizontally turned to be horizontally placed on the sleepers;

[0097] In step S66, the prefabricated pier 2 is fixed on the transport vehicle 3.

[0098] During the overturning process of the prefabricated pier 2, the close fit of the limiting plate 432 and the sponge pad can effectively prevent the prefabricated pier 2 from sliding or deviating during overturning, ensuring the stability and safety of the overturning process. In addition, the setting of the limiting tube 435 and the pipe clamp 436 further enhances the stability of the quick-release limiting assembly 43. At the same time, the quick-release limiting assembly 43 is provided with a guide groove 433, by adjusting the relative position between the guide groove 433 and the threaded hole of the overturning rack 4, and fixing the quick-release limiting assembly 43 through the screw rod and the overturning rack 4, it can be ensured that the limiting plate 432 can be adaptively close to the surface of the prefabricated pier 2 of different sizes. Overall, the quick-release limiting assembly is fixed through the screw rod passing through the guide groove 433 and the overturning rack 4, and when disassembled, only the screw rod needs to be unscrewed, and the limiting tube 435 is removed to complete the disassembly. Compared with the traditional welded limiting bracket, it realizes quick assembly and disassembly, greatly improves the construction efficiency.

[0099] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A method for constructing precast piers, characterized in that, The construction of precast piers mainly uses articulated transport vehicles (3) and tilting platforms (4) as auxiliary equipment, and specifically includes the following steps: Step S1, Rebar Cage Fabrication; According to the drawing requirements, process and fabricate the rebar cage in the rebar fabrication area; Step S2, pier body formwork (1) fabrication; splice the formwork on the transport vehicle (3), with the bottom of the formwork flush with the rear of the transport vehicle (3), install the steel cage into the formwork and seal the formwork to complete the pier body formwork (1) fabrication, place the pier body formwork (1) horizontally on the transport vehicle (3) and fix the pier body formwork (1) on the transport vehicle (3); Step S3, install the flipping platform (4); after the template is installed, connect the flipping platform (4) at the rear of the transport vehicle (3) through the hinge component, and flip the flipping platform (4) around the hinge part until it fits against the bottom lower surface of the pier template (1), and use the connector to fix the flipping platform (4) to the bottom of the pier template (1); Step S4: The pier formwork (1) is flipped; the pier formwork (1) is transported to the pouring and storage area by the transport vehicle (3), and the elevation of the hinge component and the ground of the pouring and storage area are aligned; the pier formwork (1) is released from the fixation on the transport vehicle (3); the crane enters the site, the hook is connected to the upper part of the pier formwork (1), and it is lifted upward, so that the pier formwork (1) is flipped to a vertical position around the hinge component at the rear of the transport vehicle (3), and placed in the pouring and storage area together with the flipping platform (4); then the connection between the flipping platform (4) and the transport vehicle (3) is separated, and the transport vehicle (3) is driven away; Step S5, concrete pouring and curing; pour concrete according to the drawing requirements and then cure it. Step S6, the precast pier (2) is flipped; after the precast pier (2) is cured, the transport vehicle (3) is moved to the pouring and storage area, sleepers are laid on the transport vehicle (3), and the rear of the transport vehicle (3) is re-hinged with the flipping platform (4); quick-release limiting components (43) are installed on the flipping platform (4) to hold the lower part of the precast pier (2), the crane enters the site, flips the vertically placed precast pier (2) around the hinge component at the rear of the transport vehicle (3), and places it horizontally on the sleepers, and stabilizes the precast pier (2) on the transport vehicle (3); Step S7: Move the precast pier (2) to the construction site and flip it for installation; transport the precast pier (2) to the construction site for installation using a transport vehicle (3); the crane enters the site, the hook connects to the upper part of the precast pier (2) and lifts it upward, so that the precast pier (2) is flipped around the hinge component at the rear of the transport vehicle (3) and suspended vertically. After removing the quick-release limiting component (43) and the flipping platform (4) at the bottom of the precast pier (2), the precast pier (2) is installed.

2. The precast pier construction method as described in claim 1, characterized in that, The transport vehicle (3) includes a frame (31), a traction frame (32) installed at the head of the frame (31), and a support block (33) installed at the tail of the frame (31). The hinge component is a rotating shaft (34) installed on the support block (33). The two ends of the rotating shaft (34) are respectively fitted with guide forks (35) that can slide along the axial direction of the rotating shaft (34) and rotate around the rotating shaft (34). The guide forks (35) are provided with limiters (36).

3. The precast pier construction method as described in claim 2, characterized in that, The rear sides of the vehicle frame (31) are also equipped with hydraulic feet (37), and the support strength provided by the feet (37) is not less than the total weight of the pier body template (1) and the precast pier (2).

4. The precast pier construction method as described in claim 2, characterized in that, In step S2, the specific steps for fabricating the pier body formwork (1) are as follows: Step S21: The pier body formwork (1) adopts a large-block combined fixed steel formwork. First, the inner wall of the pier body formwork (1) is polished and a release agent is applied. Step S22: Evenly lay several sleepers on the transport vehicle (3); Step S23: First, place and splice one side wall template of the pier body template (1) on the sleeper. Align the template corresponding to the bottom of the precast pier (2) with the rear of the transport vehicle (3). Install concrete pads evenly on the inner wall of the template. Step S24: Place the steel cage that has been made in step S1 onto the side wall formwork in step S23 and adjust its relative position. Step S25: Install the formwork for the other three side walls, evenly lay concrete pads between the inner wall of the formwork and the reinforcing bars, tightly splice the formwork for the remaining side walls, and seal the formwork. Step S26: Fix the pier body template (1) onto the transport vehicle (3).

5. The precast pier construction method as described in claim 2 or 3, characterized in that, The tilting platform (4) is made of high-strength steel, with several screw holes on the upper surface and several guide holes (41) that match the size of the guide fork (35) evenly on the side; the two ends of the tilting platform (4) are respectively equipped with lifting rods (42) for connecting with the crane hook.

6. The precast pier construction method as described in claim 5, characterized in that, In step S3, the specific steps for installing the tilting platform (4) are as follows: Step S31: Flatten the guide fork (35) at the rear of the transport vehicle (3), adjust the position of the guide fork (35) according to the size of the tilting platform (4) and insert it into the guide hole (41) on the side of the tilting platform (4) until the tilting platform (4) abuts against the limiter (36), and fix the limiter (36) to the tilting platform (4) with bolts; Step S32: Grind and polish the upper surface of the flipping platform (4) and apply a release agent; Step S33: Rotate the tilting platform (4) inserted on the guide fork (35) around the rotation axis (34) until the upper surface of the tilting platform (4) is in contact with the bottom of the pier body template (1); Step S34: Use screws and bolts to connect the bottom of the pier template (1) and the flipping platform (4) to fix the flipping platform (4) to the bottom of the pier template (1).

7. The precast pier construction method as described in claim 5, characterized in that, In step S4, the specific steps for flipping the pier formwork (1) are as follows: In step S41, the transport vehicle (3) is connected to the drive vehicle head via the traction frame (32), and the drive vehicle head drives the transport vehicle (3) to transport the pier body formwork (1) to the pouring and storage area; Step S42: Place a jack under the rear support block (33) of the transport vehicle (3) and lift the rear of the transport vehicle (3) until the rotating shaft (34) is aligned with the ground elevation of the pouring and storage area; Step S43: Open the foot (37) at the rear of the transport vehicle (3) so that it can be pressed against the ground to support the transport vehicle (3). Step S44: Release the pier body formwork (1) from the transport vehicle (3); Step S45: The crane enters the site, the hook connects to the upper part of the pier formwork (1) and lifts it upward, so that the pier formwork (1) and the tilting platform (4) rotate around the rotating axis (34) until the bottom of the tilting platform (4) contacts the ground of the pouring and storage area and the pier formwork (1) is vertical. Step S46: Disconnect the tilting platform (4) from the limiter (36), and drive the transport vehicle (3) away in the opposite direction to the pouring and storage area, so that the guide fork (35) is separated from the tilting platform (4).

8. The precast pier construction method as described in claim 5, characterized in that, The quick-release limiting assembly (43) includes an L-shaped integral base (431) and a limiting plate (432). The base (431) has a guide groove (433) with the same width as the screw hole on the flip-up platform (4). The limiting plate (432) is provided with a fixing piece (434) into which a limiting tube (435) can be inserted.

9. The precast pier construction method as described in claim 8, characterized in that, In step S6, the specific steps for flipping the precast pier (2) are as follows: Step S61: After the precast pier (2) is cured, move the transport vehicle (3) to the pouring and storage area, lay the guide fork (35) flat and insert it into the guide hole (41) on the side of the tilting platform (4) until the tilting platform (4) abuts against the limiter (36), fix the limiter (36) to the tilting platform (4) with bolts, and open the foot (37) to support the transport vehicle (3). Step S62: Cover the lower part of the precast pier (2) with a sponge pad, align the guide groove (433) on the base (431) of the quick-release limiting component (43) with the screw hole on the flipping frame (4), adjust the position of the quick-release limiting component (43) until the limiting plate (432) squeezes the sponge pad and fits tightly against the surface of the precast pier (2), and use a screw to screw into the guide groove (433) and the screw hole on the flipping frame (4) to fix the quick-release limiting component (43) on the flipping frame (4); there are at least 4 quick-release limiting components (43), which are fixed on the four sides of the lower part of the precast pier (2); Step S63: Insert the limiting tube (435) into the fixing piece (434) on each limiting plate (432), and lock the two mutually perpendicular limiting tubes (435) together with the pipe clamp (436); Step S64: Place several sleepers evenly on the transport vehicle (3); Step S65: The crane enters the site. Select one main crane and one auxiliary crane. The hook of the main crane is connected to the boom (42) of the tilting platform (4) away from the transport vehicle (3). The auxiliary crane is connected to the upper part of the precast pier (2). The hook of the main crane lifts the boom (42), which drives the tilting platform (4) and the precast pier (2) to rotate around the rotating axis (34). The auxiliary crane adjusts the tension synchronously to support the weight of the precast pier (2) until the precast pier (2) is horizontally rotated and placed on the sleepers. Step S66: Fix the precast pier (2) onto the transport vehicle (3).

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