Rapid inspection device for pile sinking perpendicularity of precast pile

Abstract

The utility model relates to a rapid inspection device for the pile sinking perpendicularity of a precast pile, the rapid inspection device for the pile sinking perpendicularity of the precast pile comprises a fixed seat, a foot screw pressing plate and a scale disc, the fixed seat is used for being fixed at one end of the precast pile, and a leveling screw is arranged on the fixed seat; the foot screw pressing plate is mounted on the leveling screw, and the foot screw pressing plate is provided with a laser plummet and a level bubble; the dial disc is used for being fixed to the other end of the precast pile. The leveling screw is adjusted to enable the leveling bubble to be centered, so that the precast pile is horizontal; the scale disc is calibrated through the laser plumbing instrument, the deviation condition of the precast pile can be observed through the laser plumbing instrument and the scale disc, the pile sinking perpendicularity of the precast pile can be rapidly obtained directly through the scale change of a laser falling point, the steps are simple, and a result is easy to calculate; the technical problems that in the related technology, perpendicularity checking operation is difficult, the number of steps is large, and manpower and time cost is high are solved.

Description

Technical Field

[0001] The present application relates to the field of verticality measurement at a construction site, and in particular to a device for quickly checking the verticality of precast piles. Background Art

[0002] At present, during the pile sinking process, if the precast pipe pile is not vertical enough and the slope is greater than 1%, it must be pulled out to correct the deviation. In the related technology, in the actual construction process, the total station is mainly used to control the verticality of the precast pipe pile in two mutually perpendicular directions. (1) Instrument direction: The prism-free function of the instrument is used to measure the horizontal distance S1, S2 and the height difference H between the instrument and the pipe pile. The instrument direction verticality Δ: Δ = ((S1-S2) / H) × 100%; (2) Vertical instrument direction: The method of locking the horizontal screw of the total station and vertical scanning with a steel ruler is adopted.

[0003] However, in actual operation, a total station needs to be used in two directions, which is difficult to operate and consumes a lot of manpower and material resources, with low efficiency. Once a tilt occurs, it needs to be readjusted and corrected, and the time cost will increase significantly.

[0004] Therefore, it is necessary to design a device for checking the verticality of precast pile sinking to overcome the above problems. Utility Model Content

[0005] The present application provides a device for quickly checking the verticality of pre-set piles and pile driving, which can solve the technical problems in the related art that the verticality checking operation is difficult, has many steps, and consumes a lot of manpower and time costs.

[0006] In a first aspect, an embodiment of the present application provides a device for quickly checking the verticality of a precast pile, which includes:

[0007] A fixing seat, the fixing seat is used to be fixed to one end of the prefabricated pile, and the fixing seat is provided with a leveling screw;

[0008] A foot screw pressure plate, the foot screw pressure plate is installed on the leveling screw, and the foot screw pressure plate is provided with a laser projector and a level bubble;

[0009] A graduated disc is used to be fixed to the other end of the prefabricated pile.

[0010] In combination with the first aspect, in one embodiment, the fixing seat includes a first clamp and a base, the first clamp is used to be fixed on the prefabricated pile, the base is fixed on the first clamp, and the leveling screw is arranged on the base.

[0011] In combination with the first aspect, in one embodiment, the first clamp includes two semicircular clamps, the two semicircular clamps are detachably connected, a first bearing platform is provided on the outer side of each semicircular clamp, the first bearing platforms on the two semicircular clamps form a ring, and the semicircular clamps are evenly provided with first grooves along the circumferential direction; the base is placed on the first bearing platform and is fixed to the first bearing platform through the first groove.

[0012] In combination with the first aspect, in one implementation, the inner diameter of the base is larger than the outer diameter of the semicircular clamp.

[0013] In combination with the first aspect, in one embodiment, the base includes two semicircular bases, the two semicircular bases are detachably connected, a docking platform is provided at one end of at least one of the semicircular bases, and the two semicircular bases are fixed by screws passing through the docking platform.

[0014] In combination with the first aspect, in one embodiment, the foot screw pressure plate includes two pressure plate bodies, the two pressure plate bodies are assembled into a ring, a limiting groove is provided at one end of at least one of the pressure plate bodies, and the two pressure plate bodies are fixed by the limiting groove.

[0015] In combination with the first aspect, in one embodiment, the pressure plate body is provided with a second groove at a position corresponding to the leveling screw, and the leveling screw is threadedly connected to the second groove. The pressure plate body is provided with a fixing groove corresponding to the outer side of the second groove, and the fixing groove is connected to the second groove. A screw is inserted into the fixing groove, and the leveling screw is fixed in the second groove by the screw.

[0016] In combination with the first aspect, in one embodiment, a second supporting platform is provided on one side of the foot screw pressure plate, and the level bubble is arranged on the second supporting platform.

[0017] In combination with the first aspect, in one embodiment, the quick inspection device for the verticality of precast pile driving also includes a second hoop, which is used to be fixed to the other end of the precast pile; the scale disc includes two semi-discs, and a third groove is arranged on the inner side of the semi-disc, and the scale disc is fixed to the second hoop by a screw arranged in the third groove.

[0018] In combination with the first aspect, in one embodiment, a plurality of the leveling screws are arranged on the fixed seat, and the plurality of the leveling screws are evenly distributed along the circumferential direction of the fixed seat, and a plurality of the laser projectors are arranged on the foot screw pressure plate, and the plurality of the laser projectors are evenly distributed along the circumferential direction of the foot screw pressure plate.

[0019] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0020] By setting a fixed seat, the foot screw pressure plate can be fixed to one end of the precast pile through the fixed seat, and the foot screw pressure plate can be adjusted to a horizontal state through the leveling screw on the fixed seat. The laser projector and the level bubble can be carried on the foot screw pressure plate, and the level bubble can correct the foot screw pressure plate. Since the scale disk and the foot screw pressure plate are respectively fixed at both ends of the precast pile, when the foot screw pressure plate is adjusted to horizontal, the laser projector can be turned on to observe the deviation of the precast pile on the scale disk, without the need to use a total station, which solves the technical problems in related technologies such as difficult verticality inspection operation, multiple steps, and high manpower and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a device for quickly checking the verticality of precast piles provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a first clamp provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the exploded structure of the base and the foot screw pressure plate provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the structure of the second groove and the fixing groove on the foot screw pressure plate provided in an embodiment of the present application;

[0026] Figure 5 A top view of the graduated disc provided in an embodiment of the present application.

[0027] In the figure: 1. leveling screw; 2. foot screw pressure plate; 201. pressure plate body; 202. limit groove; 203. second groove; 204. fixing groove; 205. second bearing platform; 3. laser projector; 4. level bubble; 5. scale disk; 501. semicircular disk; 502. third groove; 6. first clamp; 601. semicircular clamp; 602. first bearing platform; 603. first groove; 604. single-sided connection point; 7. base; 701. semicircular base; 702. docking platform; 8. second clamp. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The embodiment of the present application provides a device for quickly checking the verticality of precast piles, which can solve the technical problems that the inspection of the verticality of precast piles is difficult to operate, has many steps, and consumes manpower and time costs.

[0030] See also Figure 1 As shown, an embodiment of the present application provides a device for quickly checking the verticality of a precast pile, the device for quickly checking the verticality of a precast pile comprises a fixed seat, a foot screw pressure plate 2 and a scale disk 5, the fixed seat is used to be fixed to one end of the precast pile, and a leveling screw 1 is provided on the fixed seat; the foot screw pressure plate 2 is installed on the leveling screw 1, and the foot screw pressure plate 2 is provided with a laser projector 3 and a level bubble 4; the scale disk 5 is used to be fixed to the other end of the precast pile.

[0031] In this embodiment, by setting the fixing seat, the foot screw pressure plate 2 can be fixed to one end of the precast pile through the fixing seat, and the foot screw pressure plate 2 can be adjusted to a horizontal state through the leveling screw 1 on the fixing seat, the laser point projector 3 and the level bubble 4 can be carried on the foot screw pressure plate 2, and the level bubble 4 can correct the foot screw pressure plate 2. Since the scale disk 5 and the foot screw pressure plate 2 are respectively fixed at both ends of the precast pile, when the foot screw pressure plate 2 is adjusted to be horizontal, the laser point projector 3 can be turned on to observe the deviation of the precast pile on the scale disk 5, and the verticality of the precast pile sinking can be clearly seen, the result is simple and clear, and the verticality inspection work can be completed by one person. Even for operators who lack relevant business capabilities, they only need to simply fix the clamp, adjust the leveling screw 1, and turn on the laser point projector 3 to complete the measurement work. There is no need to use a total station, which solves the technical problems of difficult operation, many steps, and high manpower and time costs in related technologies for verticality inspection.

[0032] Further, see Figure 1As shown, in some embodiments, the fixing seat includes a first hoop 6 and a base 7, the first hoop 6 is used to be fixed on the precast pile, the base 7 is fixed on the first hoop 6, and the leveling screw 1 is arranged on the base 7. In this embodiment, the base 7 is detachably fixed to the first hoop 6, or it can be fixed in an irremovable manner (such as welding). In this embodiment, the base 7 is preferably fixed to the first hoop 6 in a detachable manner (such as bolt connection), wherein the first hoop 6 can be held on the outside of the precast pile, and the base 7 can be fixed on the outside of the first hoop 6. Since the fixing seat includes the first hoop 6, the first hoop 6 can better match the shape of the precast pile, so that the first hoop 6 is tightly clamped to the outside of the precast pile, and by fixing the base 7 on the first hoop 6, the base 7 can support or install the leveling screw 1 more stably than the first hoop 6.

[0033] Further, see Figure 1 and Figure 2 As shown, in some embodiments, the first clamp 6 includes two semicircular clamps 601, and the two semicircular clamps 601 are detachably connected, and a first bearing platform 602 is provided on the outer side of each semicircular clamp 601, and the first bearing platforms 602 on the two semicircular clamps 601 form a ring, and the semicircular clamps 601 are evenly provided with first grooves 603 along the circumferential direction; the base 7 is placed on the first bearing platform 602 and fixed to the first bearing platform 602 through the first groove 603. In this embodiment, a first bearing platform 602 is provided on the outer side of the semicircular clamp 601, and the semicircular clamp 601 is evenly provided with first grooves 603 along the circumferential direction. The base 7 is placed on the first bearing platform 602, and the base 7 is fixed to the first bearing platform 602 in the first groove 603 by screws. The first bearing platform 602 is fitted with the base 7 so that the first bearing platform 602 is supported on the bottom of the base 7, thereby ensuring the stable fixation of the base 7; single-sided connection points 604 are provided at both ends of the semicircular clamp 601, and the two semicircular clamps 601 are fixed by double screws penetrated through the single-sided connection points 604.

[0034] Further, see Figure 1 and Figure 2As shown, in some embodiments, the inner diameter of the base 7 may be larger than the outer diameter of the semicircular clamp 601. In this embodiment, different types of the first clamps 6 may be used when facing precast piles of different radii, and the relative positions and center distances of the first grooves 603 on the first clamps 6 of different types remain fixed, so that the first clamps 6 of different types can carry the base 7 of the same size, and the same base 7 can be adapted to the first clamps 6 of different types, ensuring the measurement of precast piles with different outer diameters, and there is no need to manufacture multiple types of bases 7, so the material cost can be greatly reduced.

[0035] Further, see Figure 3 As shown, in some embodiments, the base 7 includes two semicircular bases 701, the two semicircular bases 701 are detachably connected, a docking platform 702 is provided at one end of at least one of the semicircular bases 701, and the two semicircular bases 701 are fixed by screws penetrated through the docking platform 702. In this embodiment, a docking platform 702 can be set at one end of each of the semicircular bases 701, and the docking platform 702 at one end of one of the semicircular bases 701 can be fixed to the end of the other semicircular base 701 that is not provided with the docking platform 702 by means of screws penetrated through the docking platform 702, wherein the docking platform 702 on one of the semicircular bases 701 is fitted with the upper surface of the other semicircular base 701, and the screws pass through the docking platform 702 and penetrate into the other semicircular base 701 to achieve the fixation of the two semicircular bases 701; it is also possible that the docking platforms 702 are set at both ends of one of the semicircular bases 701, and the other semicircular base 701 is not provided with the docking platform 702, and the docking platforms 702 at both ends of one of the semicircular bases 701 can be fixed to the two ends of the other semicircular base 701 by means of screws penetrated through the docking platform 702. In this embodiment, since the two semicircular bases 701 are fixed by the docking platform 702, the surface of one of the semicircular bases 701 can be fitted with the docking platform 702 on the other semicircular base 701, so that the surfaces of the two semicircular bases 701 are flush, and the leveling screws 1 installed on the two semicircular bases 701 are made consistent in height, which is beneficial to the installation and adjustment of the foot screw pressure plate 2.

[0036] Further, see Figure 3As shown, in some embodiments, the foot screw pressure plate 2 includes two pressure plate bodies 201, the two pressure plate bodies 201 are assembled into a ring, and a limiting groove 202 is provided at one end of at least one of the pressure plate bodies 201, and the two pressure plate bodies 201 are fixed by the limiting groove 202. In this embodiment, a limiting groove 202 can be provided at one end of each of the pressure plate bodies 201, wherein the limiting groove 202 at one end of one of the pressure plate bodies 201 can be inserted and fixed with one end of the other pressure plate body 201 without the limiting groove 202; or one of the pressure plate bodies 201 can be provided with limiting grooves 202 at both ends, and the other pressure plate body 201 is not provided with limiting grooves 202, and the limiting grooves 202 at both ends of one of the pressure plate bodies 201 can be inserted and fixed with both ends of the other pressure plate body 201. The two pressing plate bodies 201 are inserted and fixed through the limiting grooves 202 so that the surfaces of the two pressing plate bodies 201 are flush, which is conducive to the laser projectors 3 on the two pressing plate bodies 201 being in the same plane.

[0037] Further, see Figure 4 As shown, in some embodiments, the pressure plate body 201 is provided with a second groove 203 at a position corresponding to the leveling screw 1, the leveling screw 1 is threadedly connected to the second groove 203, and the pressure plate body 201 is provided with a fixing groove 204 at the outer side corresponding to the second groove 203, the fixing groove 204 is communicated with the second groove 203, a screw is inserted into the fixing groove 204, and the leveling screw 1 is fixed in the second groove 203 by the screw. In this embodiment, the pressure plate body 201 is provided with a second groove 203 at a position corresponding to the leveling screw 1, the leveling screw 1 is spirally rotated in the second groove 203, and a fixing groove 204 is provided at the outer side corresponding to the second groove 203, when the screw in the fixing groove 204 rotates to contact the leveling screw 1, the leveling screw 1 is fixed and cannot continue to screw in, and the coordinated use of the second groove 203 and the fixing groove 204 ensures the stability of the foot screw pressure plate 2.

[0038] Further, see Figure 3As shown, in some embodiments, a second bearing platform 205 is provided on one side of the foot screw pressure plate 2, and the level bubble 4 is provided on the second bearing platform 205. In this embodiment, the level bubble 4 is supported and fixed by providing the second bearing platform 205 on the outside of the foot screw pressure plate 2. When the foot screw pressure plate 2 is installed on the prefabricated pile, the second bearing platform 205 protrudes outward relative to the prefabricated pile, and the level bubble 4 is separated from the prefabricated pile by a certain distance in the radial direction, so as to facilitate the observation of the level bubble 4. The level bubble 4 can be centered by adjusting the leveling screw 1, and the foot screw pressure plate 2 can be corrected by the level bubble 4 to make it level.

[0039] Further, see Figure 1 and Figure 5 As shown, in some embodiments, the quick inspection device for the verticality of the precast pile driving further includes a second clamp 8, which is used to be fixed to the other end of the precast pile; the graduated disk 5 includes two semi-circular disks 501, and the inner side of the semi-circular disks 501 is provided with a third groove 502, and the graduated disk 5 is fixed to the second clamp 8 by screws provided in the third groove 502. The two semi-circular disks 501 can be assembled into a circular ring after being fixed to the second clamp 8. In this embodiment, by providing the second clamp 8, the two semi-circular disks 501 can be fixed to the other end of the precast pile through the second clamp 8, and the semi-circular disks 501 can be tightly fixed to the precast pile. Of course, in other embodiments, other fixing methods can also be used, such as directly bonding and fixing the two semi-circular disks 501 to the precast pile.

[0040] In this embodiment, the inner diameter of the scale disk 5 can be larger than the outer diameter of the second clamp 8. When facing precast piles with different radii, different types of second clamps 8 can be used. Different types of second clamps 8 can carry the scale disk 5 of the same size. The scale disk 5 can be adapted to different types of clamps, thereby ensuring the measurement of precast piles with different outer diameters. At the same time, there is no need to produce multiple types of scale disks 5, thereby greatly reducing the material cost. By observing the changes in the landing point of the laser on the scale disk 5, the inclination distance and the verticality of the precast pile can be quickly obtained.

[0041] Further, see Figure 3As shown, in some embodiments, a plurality of leveling screws 1 are provided on the fixing seat, and the plurality of leveling screws 1 are evenly distributed along the circumferential direction of the fixing seat; a plurality of laser point projection devices 3 are provided on the foot screw pressure plate 2, and the plurality of laser point projection devices 3 are evenly distributed along the circumferential direction of the foot screw pressure plate 2. In this embodiment, the plurality of leveling screws 1 can be three or four or more, and the plurality of leveling screws 1 can level multiple positions of the foot screw pressure plate 2, so that all parts of the foot screw pressure plate 2 are in a horizontal state, which is beneficial to improve the inspection accuracy of the verticality of the precast pile sinking; the plurality of laser point projection devices 3 can be three or four or more, and the plurality of laser point projection devices 3 are beneficial to improve the inspection accuracy of the verticality of the precast pile sinking. Among them, when the leveling screws 1 and the laser point projection devices 3 are both set to three. Three leveling screws 1 are evenly placed on the base 7 at 120°, and three laser point projection devices 3 are evenly placed on the foot screw pressure plate 2 at 120°.

[0042] Specifically, the method for quickly checking the verticality of precast piles provided by the present application may include the following steps:

[0043] S1: Fix the first clamp 6 to the head end of the precast pile, fix the second clamp 8 to the tail end of the precast pile, install the base 7 on the first clamp 6, install the leveling screw 1 on the base 7, install the foot screw pressure plate 2 on the leveling screw 1, and install the scale disk 5 on the second clamp 8.

[0044] S2: Adjust the leveling screw 1 so that the level bubble 4 is centered and the foot screw pressure plate 2 is level.

[0045] S3: Turn on the laser projector 3, and quickly obtain the verticality of the precast pile according to the scale change of the laser landing point on the scale disk 5.

[0046] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0047] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0048] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A quick inspection device for the verticality of precast piles, characterized in that: It includes: A fixing seat, the fixing seat being used to be fixed to one end of the prefabricated pile, and the fixing seat being provided with a leveling screw (1); A foot screw pressure plate (2), the foot screw pressure plate (2) being mounted on the leveling screw (1), the foot screw pressure plate (2) being provided with a laser projector (3) and a level bubble (4); A graduated disc (5) is used to be fixed to the other end of the prefabricated pile.

2. The quick inspection device for the verticality of precast pile sinking as claimed in claim 1 is characterized in that: The fixing seat comprises a first hoop (6) and a base (7), wherein the first hoop (6) is used to be fixed on a prefabricated pile, the base (7) is fixed on the first hoop (6), and the leveling screw (1) is arranged on the base (7).

3. The quick inspection device for the verticality of precast pile sinking as claimed in claim 2 is characterized in that: The first clamp (6) comprises two semicircular clamps (601), the two semicircular clamps (601) are detachably connected, a first bearing platform (602) is provided on the outer side of each semicircular clamp (601), the first bearing platforms (602) on the two semicircular clamps (601) form a ring, and the semicircular clamps (601) are evenly provided with first grooves (603) along the circumferential direction; The base (7) is placed on the first supporting platform (602) and is fixed to the first supporting platform (602) via the first groove (603).

4. The quick inspection device for the verticality of precast pile sinking as claimed in claim 3 is characterized in that: The inner diameter of the base (7) is larger than the outer diameter of the semicircular clamp (601).

5. The device for quickly checking the verticality of precast pile sinking as claimed in claim 3, characterized in that: The base (7) comprises two semicircular bases (701), the two semicircular bases (701) are detachably connected, a docking platform (702) is provided at one end of at least one of the semicircular bases (701), and the two semicircular bases (701) are fixed by screws passing through the docking platform (702).

6. The quick inspection device for the verticality of precast pile sinking as claimed in claim 1 is characterized in that: The foot screw pressure plate (2) comprises two pressure plate bodies (201), the two pressure plate bodies (201) are assembled into a ring shape, one end of at least one of the pressure plate bodies (201) is provided with a limiting groove (202), and the two pressure plate bodies (201) are fixed by means of the limiting groove (202).

7. The device for quickly checking the verticality of precast piles as claimed in claim 6, characterized in that: The pressure plate body (201) is provided with a second groove (203) at a position corresponding to the leveling screw (1), and the leveling screw (1) is threadedly connected to the second groove (203). The pressure plate body (201) is provided with a fixing groove (204) corresponding to the outer side of the second groove (203), and the fixing groove (204) is connected to the second groove (203). A screw is inserted into the fixing groove (204), and the leveling screw (1) is fixed in the second groove (203) by the screw.

8. The device for quickly checking the verticality of precast piles as claimed in claim 1, characterized in that: A second bearing platform (205) is provided on one side of the foot screw pressure plate (2), and the level bubble (4) is arranged on the second bearing platform (205).

9. The device for quickly checking the verticality of precast piles as claimed in claim 1, characterized in that: The device for quickly checking the verticality of a precast pile also includes a second hoop (8), wherein the second hoop (8) is used to be fixed to the other end of the precast pile; The graduated disk (5) comprises two semi-circular disks (501), a third groove (502) is arranged inside the semi-circular disks (501), and the graduated disk (5) is fixed to the second clamping hoop (8) via screws arranged in the third groove (502).

10. The device for quickly checking the verticality of precast piles as claimed in claim 1, characterized in that: A plurality of the leveling screws (1) are arranged on the fixing seat, and the plurality of the leveling screws (1) are evenly distributed along the circumferential direction of the fixing seat; a plurality of the laser point projectors (3) are arranged on the foot screw pressure plate (2), and the plurality of the laser point projectors (3) are evenly distributed along the circumferential direction of the foot screw pressure plate (2).

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