An adjustable pedestal applicable to precast beam and slab construction

Abstract

The present invention belongs to the technical field of precast box girder construction in bridge engineering, and particularly relates to an adjustable pedestal applicable to precast beam and slab construction. The adjustable pedestal comprises a box pedestal and a sliding pedestal. The sliding pedestal includes a chassis slidably connected to the box pedestal, a platform frame rotatably connected to the chassis, and a lifting platform provided on the platform frame. The present invention synchronously adjusts the angle of the platform frame by means of the lifting platform parallel to the platform frame directly fitting the concrete surface. After the lifting platform is removed, the platform frame can completely fit the concrete surface, without implementing the process of accurately measuring the data of the concrete surface and then adjusting the angle of the platform frame for fixing according to the data, greatly reducing the construction difficulty and shortening the construction time.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated box beam construction in bridge engineering, and in particular relates to an adjustable pedestal suitable for prefabricated beam and slab construction. Background Art

[0002] Prefabricated box girders are widely used in mountainous roads due to their advantages such as simple construction, short construction period, and easy quality control. Mountain highway bridges often have large longitudinal and transverse slopes. Prefabricated beams are generally equal-height beams prefabricated horizontally, and the installation of bridge bearings usually requires the bottom of the beam to remain horizontal. The transverse slope is often adjusted by cap beams or bearing pads in the design, and the longitudinal slope is adjusted by pre-embedded steel plates at the bottom of the beam or setting wedge blocks. Therefore, when prefabricating beams, it is necessary to use pre-embedded steel plates or set wedge blocks to adjust the longitudinal slope of the beam. The purpose of the pre-embedded steel plates of bridges is to increase the impact resistance of the beam and increase the contact area of the stress points of the beam, so as to ensure that the force generated by the load is transmitted evenly and evenly. However, the traditional treatment methods such as burying sand in the beam pedestal or adding wedge-shaped steel plates at the bottom of the beam are difficult to control in terms of accuracy and the construction process is cumbersome. If handled improperly, the bearing and the pre-embedded steel plate at the bottom of the beam will be uneven and empty. Under the long-term action of vehicle dynamic loads, the bearings are easily damaged or even fall off, which poses a quality risk to the safe operation of the bridge.

[0003] The document with the authorization announcement number CN115122493B discloses a beam-slab bottom wedge-shaped block adjustable support variable transverse slope steel pedestal, the box seat includes a sliding bottom plate, and a rectangular box frame detachably connected to the edge of the sliding bottom plate: the sliding platform includes a base frame and a platform frame: the base frame is slidably connected to the sliding bottom plate and connected to a push-pull mechanism, and the push-pull mechanism passes through the end face side wall of the rectangular box frame; the platform frame is rotatably connected to the base frame and is located above the base frame, and the rotation angle of the platform frame is adjusted by a leveling mechanism connected to the base frame; the number of splicing blocks is multiple, and they all span the two side walls of the rectangular box frame and are spliced on both sides of the platform frame; the two splicing blocks adjacent to the two side edges of the platform frame are connected to the top surface of the platform frame through a slope panel mechanism. This scheme increases the accuracy of angle control, so that the bearing surface fits tightly with the concrete surface.

[0004] However, this solution still has the following problems: During actual construction, the beam and the support have a certain height to ensure construction space. Therefore, before adjusting the angle of the platform frame, it is necessary to first measure the data of the concrete surface of the beam, and then adjust the platform frame to the same angle according to the data, and finally complete the fixation of the platform frame. This process of measuring data is cumbersome and time-consuming. If the beam is first lowered to a height that fits the platform frame, the weight of the beam will be pressed on the unfixed platform frame, which will easily cause irreversible damage to the rotating components on the platform frame, and the compressed construction space will also increase the difficulty of construction.

[0005] To this end, the inventor of the present invention has proposed an adjustable pedestal applicable to the construction of precast beam and slab, which is used to solve the above technical problems. Summary of the Invention

[0006] In view of the above existing problems, the object of the present invention is to provide an adjustable pedestal applicable to the construction of precast beam and slab. By means of the lifting platform parallel to the platform frame directly fitting with the concrete surface, the angle of the platform frame is synchronously adjusted. After the lifting platform is removed, the platform frame can completely fit with the concrete surface, without the need to accurately measure the data of the concrete surface and then adjust the angle of the platform frame according to the data for fixing, greatly reducing the construction difficulty and shortening the construction time.

[0007] The specific technical solution of the present invention is as follows:

[0008] An adjustable pedestal applicable to the construction of precast beam and slab, comprising a box seat and a sliding seat. The sliding seat includes a bottom frame slidably connected to the box seat, a platform frame rotatably connected to the bottom frame, and a lifting platform provided on the platform frame;

[0009] An installation hole is provided in the middle of the platform frame, and an installation plate is provided at the lower end of the platform frame located at the installation hole;

[0010] A level gauge is provided on the installation plate, and the lifting part of the level gauge passes through the installation hole and is detachably connected to the lower surface of the lifting platform.

[0011] As a further preference of the present invention, the installation plate includes a bottom plate for carrying the level gauge and a connecting member provided at the side end of the bottom plate;

[0012] A first fixing hole is provided at the side end of the installation hole on the platform frame;

[0013] A second fixing hole matching the first fixing hole is provided on the connecting member, and a bolt is provided to pass through the first fixing hole and the second fixing hole to complete the connection between the connecting member and the platform frame.

[0014] As a further preference of the present invention, the bottom plate is formed by splicing and connecting two plate bodies; the connecting member is provided at the side end of each plate body;

[0015] The connecting member includes a cross plate provided with the second fixing hole, two fixing ears provided at both sides of the lower end of the cross plate, two rotating rods rotatably connected to the two fixing ears, and connecting plates provided at both ends of the plate body and respectively connected to the two rotating rods.

[0016] As a further preference of the present invention, a positioning groove plate is provided on the lower surface of one of the plate bodies, and a clamping plate rotatably connected to the lower surface of the other plate body and insertable into the positioning groove plate is provided.

[0017] As a further preference of the present invention, the lifting platform includes a flat plate and a groove provided in the middle of the lower surface of the flat plate and matching with the upper end of the lifting part of the lifting instrument.

[0018] As a further preference of the present invention, the lifting platform further includes a support spring provided between the upper surface of the platform frame and the lower surface of the flat plate.

[0019] As a further preference of the present invention, two vertical plates are respectively provided at both ends of the platform frame, and a first rotation hole is provided on the vertical plate;

[0020] Two groups of clamping plates are provided on the bottom frame. Each group of clamping plates includes two clamping plate bodies located at both ends of the vertical plate, a second rotation hole provided on the clamping plate body and matching with the first rotation hole, a threaded rod passing through the first rotation hole and the second rotation hole, and two fastening nuts screwed on the threaded rod and located at the side ends of the two clamping plate bodies.

[0021] As a further preference of the present invention, each group of clamping plates further includes a support ear provided at the upper end of the clamping plate body, an internal thread hole provided on the support ear, a support screw screwed into the internal thread hole and extending to the lower surface of the platform frame, and a positioning nut screwed on the support screw.

[0022] As a further preference of the present invention, a limit projection is provided on the upper surface of the bottom plate.

[0023] As a further preference of the present invention, an anti-slip layer is provided on the upper surface of the bottom plate.

[0024] The beneficial effects of the present invention are as follows:

[0025] The adjustable pedestal provided by the present invention can directly make the lifting platform fit with the concrete surface by lifting the lifting platform parallel to the platform frame, and since the lifting platform and the platform frame rotate synchronously, after the lifting platform is completely fitted with the concrete surface, the data on the surface of the platform frame is the same as that on the surface of the lifting platform. After the lifting platform is removed, the platform frame can completely fit with the concrete surface, eliminating the need to accurately measure the data of the concrete surface and then adjust the angle of the platform frame for fixation according to the data, greatly reducing the construction difficulty and shortening the construction time.

[0026] In the adjustable pedestal provided by the present invention, the connecting members between the lifting platform and the platform frame are simple and detachable, and can be flexibly implemented even in a limited operating space, having the advantage of strong practicability.

[0027] In the adjustable pedestal provided by the present invention, the lifting platform can be recycled after the angle of the platform frame is fixed, which has the advantage of good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG Figure 1 is a schematic structural view of the present invention from the front view angle.

[0029] FIG Figure 2 provided by the present invention Figure 1 is a schematic cross-sectional structural view at position A from the side view angle.

[0030] FIG Figure 3 is a schematic cross-sectional structural view of the present invention from the front view angle.

[0031] FIG Figure 4 is a schematic cross-sectional structural view of some other embodiments of the present invention from the front view angle.

[0032] FIG Figure 5 is a schematic connection structural view of the mounting plate of the present invention.

[0033] FIG Figure 6 is a schematic open structural view of the mounting plate of the present invention

[0034] BRIEF DESCRIPTION OF THE DRAWINGS: Box seat 1, sliding seat 2, splicing block 3;

[0035] Underframe 21, platform frame 22, lifting platform 23;

[0036] Clamping plate body 211, rotation hole two 212, threaded rod 213, fastening nut 214, support ear 215, support screw 216, positioning nut 217;

[0037] Mounting hole 221, mounting plate 222, vertical plate 223, rotation hole one 224;

[0038] Level meter 231, flat plate 232, groove 233, support spring 234;

[0039] Plate body 2221, cross plate 2222, fixed ear 2223, rotating rod 2224, connecting plate 2225, positioning groove plate 2226, clamping plate 2227, limiting protrusion 2228. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0041] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, terms such as "set" and "connect" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection: it can be a mechanical connection or an electrical connection: it can be a direct connection or an indirect connection through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] First of all, it should be pointed out that the adjustable pedestal applicable to the construction of precast beam and slab is arranged between the beam body and the bearing and is used for leveling. The principle is that the lower surface of the adjustable pedestal fits the bearing surface, and the upper surface of the adjustable pedestal fits the concrete surface of the beam body, optimizing the force on the bearing, enabling the bearing to evenly bear the vertical load, and extending the service life of the bearing. At the connection of the beam body, the adjustable pedestal can correct the problem of the elevation difference at the beam end caused by the installation error of the formwork or the settlement of the foundation.

[0043] The problem existing in the implementation of the existing scenario is that in the case of limited space, it is difficult to accurately measure the data on the lower surface of the beam body and correspondingly adjust the angle of the upper surface of the pedestal, which is time-consuming and laborious.

[0044] Based on this, the present invention proposes an adjustable pedestal applicable to the construction of precast beam and slab. The following are specific embodiments:

[0045] Refer to Att Figure 1 ~Att Figure 3 As shown, this embodiment provides an adjustable pedestal applicable to the construction of precast beam and slab, which includes a box seat 1 and a sliding seat 2, and also includes a splicing block 3.

[0046] Among them, the pedestal 1 at least includes a sliding base plate and a pedestal frame detachably connected to the end of the sliding base plate. The sliding base plate has a long side and a short side. A fixed vertical plate can be provided at the short side, and the pedestal frame is connected to the fixed vertical plate at the short side of the sliding base plate 11 through bolt connectors. The number of splicing blocks 3 is multiple, and they span two pedestal frames 12 along the short side direction of the sliding base plate. The splicing blocks 3 are mainly spliced into two groups and are correspondingly distributed on both side ends of the sliding seat 2. There is a drop between the splicing surface formed by the splicing blocks 3 and the top surface of the sliding seat 2, and this drop is connected by an additional slope panel. The above structure directly refers to the pedestal, splicing blocks, slope panel structure, etc. in the prior art (the authorized publication number is CN115122493B, a variable cross-slope steel pedestal for adjustable wedge blocks at the bottom of beam slabs), so this embodiment will not be elaborated further.

[0047] In this embodiment, the sliding seat 2 includes a chassis 21 slidably connected to the pedestal 1, a platform frame 22 rotatably connected to the chassis 21, and a lifting platform 23 provided on the platform frame 22.

[0048] Among them, sliders are provided on the lower surface of the chassis 21, and sliding grooves matching the sliders are provided on the pedestal 1. On both sides of the upper surface of the chassis 21, two adjusting plates are provided, and through holes for the long screw to pass through are provided on both adjusting plates; when the position of the chassis 21 is determined, the position of the chassis 21 is fixed by respectively tightening one adjusting plate with two positioning nuts screwed on the long screw. This structure can also refer to the pushing and pulling mechanism in the prior art (the authorized publication number is CN115122493B, a variable cross-slope steel pedestal for adjustable wedge blocks at the bottom of beam slabs), so this embodiment will not be elaborated further.

[0049] Among them, an implementation structure for the platform frame 22 to be rotatably connected to the chassis 21 is as follows:

[0050] Two vertical plates 223 are respectively provided at both side ends of the platform frame 22, and a first rotation hole 224 is provided on the vertical plate 223; two groups of clamping plates are provided on the chassis 21, and each group of clamping plates includes two clamping plate bodies 211 located on both side ends of the vertical plate 223, a second rotation hole 212 provided on the clamping plate body 211 and matching the first rotation hole 224, a threaded rod 213 passing through the first rotation hole 224 and the second rotation hole 212, and two fastening nuts 214 screwed on the threaded rod 213 and located at the side ends of the two clamping plate bodies 211.

[0051] When the position of the platform frame 22 is not determined, the fastening nut 214 does not contact the clamp body 211, allowing the vertical plate 233 to rotate; after the position of the platform frame 22 is determined, the fastening nut 214 is tightened so that the two clamp bodies 211 approach each other to clamp both ends of the vertical plate 233, and at this time, the vertical plate 233 can no longer rotate. To ensure the strength of the clamp body 211, a metal alloy material can be selected. Under the abutment of the fastening nut 214, the clamp body 211 can deform to reduce the distance between the two clamp bodies 211 to achieve the effect of clamping the vertical plate 233. When the abutment is released, the clamp body 211 can return to its original vertical state relying on the characteristics of the metal alloy material itself.

[0052] Since simply relying on structures such as the fastening nut 214 and the threaded rod 213 to complete the angle fixation of the platform frame 22 has problems of excessive load and heavy wear. Therefore, more preferably, each set of clamps further includes a support ear 215 provided at the upper end of the clamp body 211, an internal threaded hole provided on the support ear 215, a support screw 216 screwed into the internal threaded hole and extending to the lower surface of the platform frame 22, and a positioning nut 217 screwed onto the support screw 216. The support ears 215 are provided at both ends of the clamp body 211 inside the vertical plate 233, and the two sets of clamps have four support ears 215, corresponding to the four corners of the platform frame 22 respectively. After the position of the platform frame 22 is determined, the heights of the support screws 216 at the four support ears 215 are adjusted respectively so that the upper ends of the support screws 216 abut against the lower surface of the platform frame 22, and then the positioning nuts 217 are used for fixation. Such a setting can reduce the force transmitted to the threaded rod 213, achieve the purpose of reducing part wear, and at the same time strengthen the support strength of the platform frame 22.

[0053] In this embodiment, an installation hole 221 is provided in the middle of the platform frame 22, and an installation plate 222 is provided at the lower end of the platform frame 22 where the installation hole 221 is located; a level 231 is provided on the installation plate 222, and the lifting part of the level 231 passes through the installation hole 221 and is detachably connected to the lower surface of the lifting platform 23.

[0054] Furthermore, the installation plate 222 includes a bottom plate for carrying the level 231 and a connecting member provided at the side end of the bottom plate; a first fixing hole is provided on the platform frame 22 at the side end of the installation hole 221; a second fixing hole matching the first fixing hole is provided on the connecting member, and a bolt is provided to pass through the first fixing hole and the second fixing hole to complete the connection between the connecting member and the platform frame 22.

[0055] Among them, the size of the installation hole 221 needs to be larger than that of the lifter 231 to facilitate the placement of the lifter 231. The lifter 231 can be an existing power device such as a cylinder or a jack. After the lifter 231 is installed on the mounting plate 222, the lifter 231 can lift the lifting platform 23 so that the lifting platform 23 is directly in contact with the concrete surface of the beam body. After the lifting platform 23 is partially in contact with the concrete surface, due to the uneven force from the concrete surface, since the lifter 231 is connected to the mounting plate 222, the platform frame 22 drives the lifting platform 23 to rotate synchronously at this time until the surface of the lifting platform 23 is completely in contact with the concrete surface. At this time, the force on the lifting platform 23 is uniform and it no longer rotates. After the angle of the lifting platform 23 is determined, the fastening nut 214 can be tightened and the adjusting support screw 216 can be adjusted to complete the fixation of the platform frame 22, achieving the purpose of having a very small error between the data on the surface of the platform frame 22 and the data on the concrete surface. Finally, the lifter 231 lowers the lifting platform 23 to expand the operating space at the upper end of the lifting platform 23, and then the entire lifting platform 23 together with the lifter 231 can be removed.

[0056] The cooperation between the lifting platform 23 and the platform frame 22 achieves the following effects that cannot be achieved by the prior art: First, by lifting the lifting platform parallel to the platform frame, the lifting platform can be directly brought into contact with the concrete surface, and the result of whether it is in contact can be directly observed. Since the lifting platform and the platform frame rotate synchronously, after the lifting platform is completely in contact with the concrete surface, the data on the surface of the platform frame is also the same as that on the surface of the lifting platform. After the lifting platform is removed, the platform frame can also be completely in contact with the concrete surface, eliminating the need to precisely measure the data of the concrete surface and then adjust the angle of the platform frame for fixation according to the data, greatly reducing the construction difficulty and shortening the construction time; Second, the connecting components between the lifting platform and the platform frame are simple and detachable, and can be flexibly implemented even in a limited operating space, having the advantage of strong practicability; Third, the lifting platform can be recycled and reused after the angle of the platform frame is fixed, having the advantage of good economy.

[0057] In some other preferred embodiments, as shown in Figure 4 ~ Figure 6 shown, the bottom plate is formed by splicing and connecting two plate bodies 2221; a connecting member is provided at the side end of each plate body 2221; the connecting member includes a cross plate 2222 provided with the second fixing hole, two fixing ears 2223 provided at both lower ends of the cross plate 2222, two rotating rods 2224 rotatably connected to the two fixing ears 2223, and connecting plates 2225 provided at both ends of the plate body 2221 and respectively connected to the two rotating rods 2224.

[0058] Furthermore, a positioning groove plate 2226 is provided on the lower surface of one of the plate bodies 2221, and a clamping plate 2227 that can be inserted into the positioning groove plate 2226 is rotatably connected to the lower surface of the other plate body 2221. The cooperation between the clamping plate 2227 and the positioning groove plate 2226 is similar to the plug structure in the prior art, so it will not be elaborated here.

[0059] Among them, the plate body 2221 and the two connecting plates 2225 at both ends form a U-shaped structure. When two U-shaped structures are joined together, a larger U-shaped structure is formed, thus ensuring that there is enough internal space for placing the elevator 231. In addition, more importantly, when the operating space at the upper end of the lifting platform 23 is insufficient, it is difficult for the elevator 231 to be removed from the upper end of the lifting platform 23. At this time, the bottom plate formed by joining can be opened from the middle, so that the elevator 231 can be removed from the lower space of the bottom plate, increasing the possibility of the device being implemented in a limited space.

[0060] Specifically, the lifting platform 23 includes a flat plate 232 and a groove 233 provided in the middle of the lower surface of the flat plate 232 and matching the upper end of the lifting part of the elevator 231. The way that the groove 233 is snap-connected to the upper end of the lifting part of the elevator 231 reduces the difficulty of separating the elevator 231 from the lifting platform 23. And, since the lifting platform 23 is always subjected to a force from above when it is connected to the elevator 231, there will be no problem of poor stability caused by the snap connection structure when the lifting platform 23 and the elevator 231 are working.

[0061] Furthermore, the lifting platform 23 further includes a support spring 234 provided between the upper surface of the platform frame 22 and the lower surface of the flat plate 232. Among them, in order to facilitate the fixation of the support spring 234, grooves that are snap-connected to the ends of the support spring 234 can be provided on both the upper surface of the platform frame 22 and the lower surface of the lifting platform 23. The support spring 234 plays a role when the lifting platform 23 is pressed, mainly playing a buffering role and dispersing the force on the lifting part of the elevator 231. The support spring 234 is disassembled together with the lifting platform 23.

[0062] Furthermore, a limiting protrusion 2228 is provided on the upper surface of the bottom plate. Alternatively, an anti-slip layer is provided on the upper surface of the bottom plate. The purpose of such settings is to enhance the connection tightness between the bottom plate and the bottom surface of the elevator 231 and prevent the elevator 231 from slipping on the bottom plate.

[0063] Specifically, the platform frame 22 may be a double-layer plate structure, and the two layer plates are connected by I-beams to ensure the structural strength. Moreover, in order to ensure the installation strength of the mounting plate 222, the I-beams may be provided at the connection of the mounting plate 222, and the openings of the I-beams may be aligned with the first fixing hole and the second fixing hole, and then connected and fixed by bolts. Similarly, the I-beams may also be provided at the abutting positions of the support screws 216 to enhance the pressure-bearing capacity of the platform frame 22.

[0064] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An adjustable pedestal applicable to the construction of precast beam slabs, comprising a box pedestal (1) and a sliding pedestal (2), characterized in that: The sliding seat (2) includes a chassis (21) slidably connected to the box seat (1), a platform frame (22) rotatably connected to the chassis (21), and a lifting platform (23) provided on the platform frame (22); An installation hole (221) is provided in the middle of the platform frame (22), and an installation plate (222) is provided at the lower end of the platform frame (22) located at the installation hole (221); A level gauge (231) is provided on the installation plate (222), and the lifting part of the level gauge (231) passes through the installation hole (221) and is detachably connected to the lower surface of the lifting platform (23); Two vertical plates (223) are respectively provided at both side ends of the platform frame (22), and a first rotation hole (224) is provided on the vertical plate (223); Two groups of clamping plates are provided on the chassis (21). Each group of clamping plates includes two clamping plate bodies (211) located at both side ends of the vertical plate (223), a second rotation hole (212) provided on the clamping plate body (211) and matching the first rotation hole (224), a threaded rod (213) passing through the first rotation hole (224) and the second rotation hole (212), and two fastening nuts (214) screwed on the threaded rod (213) and located at the side ends of the two clamping plate bodies (211); Each group of clamping plates further includes a support ear (215) provided at the upper end of the clamping plate body (211), an internal thread hole provided on the support ear (215), a support screw (216) screwed into the internal thread hole and extending to the lower surface of the platform frame (22), and a positioning nut (217) screwed on the support screw (216).

2. The adjustable pedestal applicable to precast beam and slab construction according to claim 1, wherein: The installation plate (222) includes a bottom plate for carrying the level gauge (231), and a connecting member provided at the side end of the bottom plate; A first fixing hole is provided on the platform frame (22) at the side end of the installation hole (221); A second fixing hole matching the first fixing hole is provided on the connecting member, and a bolt is provided to pass through the first fixing hole and the second fixing hole to complete the connection between the connecting member and the platform frame (22).

3. The adjustable pedestal applicable to precast beam and slab construction according to claim 2, wherein: The bottom plate is formed by splicing and connecting two plate bodies (2221); the connecting member is provided at the side end of each plate body (2221); The connecting member includes a cross plate (2222) provided with the second fixing hole, two fixing ears (2223) provided at both lower sides of the cross plate (2222), two rotating rods (2224) rotatably connected to the two fixing ears (2223), and connecting plates (2225) provided at both ends of the plate body (2221) and respectively connected to the two rotating rods (2224).

4. The adjustable pedestal applicable to precast beam and slab construction according to claim 3, wherein: A positioning groove plate (2226) is provided on the lower surface of one plate body (2221), and a clamping plate (2227) rotatably connected to the lower surface of the other plate body (2221) and insertable into the positioning groove plate (2226) is provided.

5. The adjustable pedestal applicable to precast beam and slab construction according to claim 1, characterized in that: The lifting platform (23) includes a flat plate (232), and a groove (233) provided in the middle of the lower surface of the flat plate (232) and matching the upper end of the lifting part of the lifter (231).

6. The adjustable pedestal applicable to precast beam and slab construction according to claim 5, wherein: The lifting platform (23) further includes a support spring (234) provided between the upper surface of the platform frame (22) and the lower surface of the flat plate (232).

7. An adjustable pedestal applicable to precast beam and slab construction according to claim 2, characterized in that: A limit projection (2228) is provided on the upper surface of the bottom plate.

8. The adjustable pedestal applicable to precast beam and slab construction according to claim 2, wherein: An anti-slip layer is provided on the upper surface of the bottom plate.

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