An embedded positioning device for anchor bolts and its construction method

Abstract

The present invention provides a pre-embedded anchor bolt positioning device and a construction method thereof, which relates to the technical field of power towers and street lamp poles, and solves the technical problems of the pre-embedded anchor bolt construction method being difficult to work with, the unreliable method of fixing the anchor bolts, and the inability to ensure the verticality of the anchor bolts. The device includes a first positioning bracket and a second positioning bracket. The first positioning bracket and the second positioning bracket are a grid-shaped frame formed by the intersection of at least two longitudinal rods and at least two transverse rods. The ends of the longitudinal rods protrude outward from the outermost intersections with the transverse rods, and form a limiting structure for the anchor bolts in at least two directions at the outermost intersections of the positioning brackets. The first positioning bracket and the second positioning bracket are stacked up and down in a cross shape to position each anchor bolt in four directions. After positioning by the first positioning bracket and the second positioning bracket, the position and size of the entire group of anchor bolts are accurate, and the overall stability is good.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, in particular to a pre-embedded positioning device for anchor bolts and a construction method thereof. Background Art

[0002] Before pouring the tower crane foundation, it is necessary to pre-embed the tower crane foundation anchor bolts. Currently, after laying the foundation steel bars, the foundation anchor bolts are installed on the foundation chassis and then placed into the foundation pit. However, the tower crane foundation chassis is heavy, and the construction site must use special lifting equipment to lift the foundation chassis and anchor bolts into the foundation pit. In addition, it is necessary to set up a stable support point under the foundation chassis to ensure the level of the foundation chassis. At the same time, it is necessary to ensure that the pre-embedded anchor bolts must be perpendicular to the ground, and during the concrete vibration process, it must be ensured that the anchor bolts must be perpendicular to the ground and not shifted. The usual practice is to fix the anchor bolts to the steel bars in the foundation by welding them together after laying the foundation steel bars, or to tie the anchor bolts to the steel bars in the foundation with wire to ensure the correct position and verticality of the anchor bolts.

[0003] However, the above construction methods have the following disadvantages: 1. Welding is generally prohibited for tower crane foundation anchor bolts, as it significantly reduces their strength. 2. Existing construction methods use foundation rebar to indirectly secure the bolts. While not directly welding the bolts, this method presents significant challenges, including high workload, complex construction, and high operator skill requirements. 3. Using wire to tie the anchor bolts to the foundation rebar presents a vulnerability to instability and reliability. While bolt position errors and ground verticality can meet standards during tying, they can easily shift during pouring vibrations. Even if the upper portion of the anchor bolt is fixed to the chassis or formwork, the anchor bolts can tilt. Therefore, whether using welding or tying, ensuring consistent alignment of multiple bolts in a group poses significant challenges, leading to large errors. This often results in anchor bolts tilting out of vertical alignment after embedding, potentially leading to breakage, inability to remove the foundation chassis or pre-embedded mold, or inability to fit the holes in the foundation chassis into the anchor bolts. 4. When the anchor bolts are fixed to the foundation chassis or embedded molds, a nut is used to clamp the anchor bolts above and below the chassis bottom plate or the mold bottom plate to ensure the stability of the anchor bolt position. However, its disadvantage is that the thickness of the bottom plate is limited, generally only 30-60mm, and there is a gap between the screw hole and the nut on the bottom plate. Even if the upper and lower nuts are locked, it cannot be guaranteed that the 1-meter-long anchor bolt will not shake during pouring, making it difficult to ensure the verticality of the bolt. Summary of the Invention

[0004] The present invention aims to provide a pre-embedded anchor bolt positioning device and construction method thereof, thereby resolving the technical problems of prior art pre-embedded anchor bolt construction methods, which are difficult to implement, have unreliable anchor bolt fixing methods, and cannot ensure the verticality of the anchor bolts. The various technical effects achieved by the preferred technical solution among the various technical solutions provided by the present invention are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The present invention provides a pre-embedded positioning device for anchor bolts, comprising a first positioning bracket and a second positioning bracket, wherein the first positioning bracket and the second positioning bracket are both cross-shaped frames formed by the intersection of at least two longitudinal rods and at least two transverse rods, wherein the ends of the longitudinal rods protrude outward from the outermost intersections with the transverse rods, and form a limiting structure for the anchor bolts in at least two directions at the outermost intersections of the positioning brackets, and the first positioning bracket and the second positioning bracket are cross-stacked up and down to position each anchor bolt in four directions.

[0007] According to a preferred embodiment, all the limiting structures on the first positioning bracket or the second positioning bracket are arranged in a centrally symmetrical manner with respect to the center of the positioning bracket, and all the limiting structures are arranged in a circular manner.

[0008] According to a preferred embodiment, the longitudinal rods are arranged in a manner of gradually decreasing length from the center of the first positioning bracket or the second positioning bracket to the left and right sides, and the transverse rods are arranged in a manner of gradually decreasing length from the center of the first positioning bracket or the second positioning bracket to the upper and lower sides.

[0009] According to a preferred embodiment, the first positioning bracket and the second positioning bracket also include a giving way structure, which is a notch structure extending longitudinally outward from the center of the positioning bracket, and reinforcing rods are provided on both sides of the notch structure, and the reinforcing rods are arranged parallel to the longitudinal rods, or the reinforcing rods are arranged at an angle to the longitudinal rods.

[0010] According to a preferred embodiment, the first positioning bracket and the second positioning bracket are both cross-shaped racks formed by 8 longitudinal rods and 8 transverse rods, and 16 limiting structures arranged in a circumferential manner are formed at the outermost intersections of the first positioning bracket and the second positioning bracket; or,

[0011] The first positioning bracket and the second positioning bracket are both cross-shaped brackets formed by four longitudinal rods and four transverse rods, and eight limiting structures arranged in a circumferential manner are formed at the outermost intersections of the first positioning bracket and the second positioning bracket; or,

[0012] The first positioning bracket and the second positioning bracket are both cross-shaped brackets formed by two longitudinal rods and two transverse rods, and four limiting structures arranged in a circular manner are formed at the outermost intersection of the first positioning bracket and the second positioning bracket.

[0013] According to a preferred embodiment, when the first positioning bracket and the second positioning bracket have 8 limiting structures, a yield structure is also provided in the middle of the first positioning bracket and the second positioning bracket, and reinforcing rods arranged parallel to the longitudinal rod are provided on both sides of the yield structure. At least one end of the reinforcing rod protrudes from the outermost intersection between it and the transverse rod and extends outward, and the outward-extending reinforcing rod can form a limiting structure for the anchor bolt in three directions with the longitudinal rod and the transverse rod at the outermost intersection of the first positioning bracket and the second positioning bracket.

[0014] According to a preferred embodiment, when the first positioning bracket and the second positioning bracket have four limiting structures, a yield structure is also provided in the middle of the first positioning bracket and the second positioning bracket, and reinforcing rods are provided on both sides of the yield structure. The two reinforcing rods are inclined relative to the longitudinal rod and form a triangular structure with the longitudinal rod.

[0015] According to a preferred embodiment, a support rod is further provided on the reinforcing rod of the triangular structure. The support rod is parallel to the transverse rod and is arranged to cross the two reinforcing rods.

[0016] The present invention also provides a construction method of an anchor bolt pre-embedded positioning device, comprising the following steps:

[0017] (1) Laying the bottom steel bars of the tower crane foundation; and building a support frame for supporting the pre-buried chassis of the foundation above the bottom steel bars;

[0018] (2) Install the pre-embedded foundation chassis onto the support frame, and install a corresponding number of anchor bolts at the bolt holes formed on the pre-embedded foundation chassis to form an anchor bolt group at each corner, and tighten the tops of the anchor bolts with double nuts;

[0019] The pre-embedded foundation chassis includes a dedicated pre-embedded foundation chassis or a pre-embedded foundation combined positioning chassis, wherein the pre-embedded foundation combined positioning chassis includes a third positioning bracket, a fourth positioning bracket and a square gasket, and the pre-embedded foundation combined positioning chassis is formed by stacking the third positioning bracket and the fourth positioning bracket in a cross shape to form a bolt hole for positioning the anchor bolt, and the square gasket is arranged on the top of the fourth positioning bracket located above;

[0020] (3) Place the first positioning bracket vertically in the middle of the anchor bolt group along a first direction and parallel to the anchor bolt, then rotate the first positioning bracket 90° and place it horizontally so that it is perpendicular to the anchor bolt, and limit each anchor bolt to the limiting structure of the first positioning bracket;

[0021] (4) Place the second positioning bracket vertically and in parallel with the anchor bolt in the middle of the anchor bolt group along the second direction, then rotate the second positioning bracket 90° and place it horizontally so that it is perpendicular to the anchor bolt and located above the first positioning bracket. The second positioning bracket can limit each anchor bolt in the direction not limited by the first positioning bracket; and then the first positioning bracket and the second positioning bracket are cross-stacked up and down to achieve positioning of each anchor bolt in four directions.

[0022] According to a preferred embodiment, it further comprises:

[0023] (1) Move the stacked first and second positioning brackets to the bottom of the anchor bolt group, use connecting steel bars to fix the first and second positioning brackets to the four corner vertical bars of the support frame and the bottom steel bars, and then lay the foundation reinforcement;

[0024] (2) After the foundation reinforcement is laid, pour concrete to the bottom plane of the foundation embedded chassis. When the concrete solidifies to a certain strength, remove the foundation embedded chassis, and then install the four legs of the tower crane at the four corners respectively.

[0025] Based on the above technical solution, the anchor bolt pre-embedded positioning device and the construction method thereof of the present invention have at least the following technical effects:

[0026] The anchor bolt pre-embedded positioning device of the present invention includes a first positioning bracket and a second positioning bracket. The first positioning bracket and the second positioning bracket are each formed by a crisscross frame formed by the intersection of at least two longitudinal rods and at least two transverse rods. The ends of the longitudinal rods protrude outward from the outermost intersections with the transverse rods and form a limiting structure for the anchor bolts in at least two directions at the outermost intersections of the positioning brackets. The first positioning bracket and the second positioning bracket are stacked in a cross shape to position each anchor bolt in four directions. The anchor bolt pre-embedded positioning device of the present invention does not require welding, so it does not affect the strength of the anchor bolts. At the same time, after positioning by the first positioning bracket and the second positioning bracket, the entire group of anchor bolts is accurately positioned and dimensioned, with good overall stability, and stable and reliable during casting.

[0027] On the other hand, the present invention also provides a construction method for the pre-embedded positioning device for anchor bolts. The construction method for the pre-embedded positioning device for anchor bolts of the present invention is quick and convenient to operate, so that the anchor bolts have good overall stability and are easy to remove from the mold after casting, overcoming the defects of other pre-embedded methods such as difficulty in overall mold removal, easy damage to the threads or deformation of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figures 1 to 5 This is a pre-embedded positioning device for anchor bolts according to a preferred embodiment of the present invention;

[0030] Figures 6 to 9 This is another preferred embodiment of the anchor bolt pre-embedded positioning device of the present invention;

[0031] Figures 10 to 13 This is another preferred embodiment of the anchor bolt pre-embedded positioning device of the present invention;

[0032] Figures 14 to 17 This is another preferred embodiment of the anchor bolt pre-embedded positioning device of the present invention;

[0033] Figures 18 to 21 This is another preferred embodiment of the anchor bolt pre-embedded positioning device of the present invention;

[0034] Figure 22 This is a diagram showing the installation method of the anchor bolt pre-embedded positioning device of the present invention;

[0035] Figure 23This is a diagram showing the installation method of the anchor bolt embedded positioning device of the present invention from another perspective;

[0036] Figure 24 and Figure 25 This is a diagram showing an installation method of a preferred embodiment of the anchor bolt pre-embedded positioning device of the present invention;

[0037] Figure 26 and Figure 27 are respectively a perspective view and a side view of a support frame according to a preferred embodiment of the present invention;

[0038] Figure 28 It is a structural schematic diagram of the foundation pre-embedded combined positioning chassis in the anchor bolt positioning device of the present invention;

[0039] Figure 29 and Figure 30 This is a diagram showing the installation method of the pre-buried basic combined positioning chassis of the present invention;

[0040] Figure 31 and Figure 32 This is a diagram of an installation method of another preferred embodiment of the anchor bolt pre-embedded positioning device of the present invention;

[0041] Figure 33 and Figure 34 2 are a perspective view and a side view of a support frame according to another preferred embodiment of the present invention.

[0042] In the figure: 10-first positioning bracket; 11-second positioning bracket; 12-anchor bolt; 13-vertical reinforcement; 14-third positioning bracket; 15-fourth positioning bracket; 16-square gasket; 100-transverse rod; 101-longitudinal rod; 102-limiting structure; 103-yielding structure; 104-reinforcement rod; 105-support rod; 20-foundation pre-embedded special chassis; 21-double nut; 22-support frame; 23-bottom steel bar; 25-connecting steel bar; 26-foundation pre-embedded combined positioning chassis; 220-four corner vertical reinforcement; 221-support cross bar; 222-oblique vertical reinforcement; 223-middle vertical reinforcement. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] This embodiment provides a pre-embedded anchor bolt positioning device, which is suitable for the case where there is no vertical rib in the center of the anchor bolt group. Figure 13 As shown, the anchor bolt pre-embedded positioning device of the present invention includes a first positioning bracket 10 and a second positioning bracket 11, and the anchor bolt pre-embedded positioning device of this embodiment is composed of the first positioning bracket 10 and the second positioning bracket 11 stacked up and down in a cross shape to position each anchor bolt 12 in four directions.

[0046] Preferably, the first positioning bracket 10 and the second positioning bracket 11 are both formed by the intersection of at least two longitudinal rods 101 and at least two transverse rods 100, wherein the ends of the longitudinal rods 101 protrude outward from the outermost intersections with the transverse rods 100, and form a limiting structure 102 for the anchor bolts 12 in at least two directions at the intersections located at the outermost sides of the positioning brackets. When the first positioning bracket and the second positioning bracket of the present invention are in use, the second positioning bracket is rotated 90 degrees so that it is cross-intersected with the first positioning bracket and stacked up and down, thereby limiting the freedom of each anchor bolt in four directions. The anchor bolt pre-embedded positioning device of the present invention does not require welding, so it will not affect the strength of the anchor bolts. At the same time, after positioning by the first positioning bracket and the second positioning bracket, the position and size of the entire group of anchor bolts are accurate, the overall stability is good, and it is stable and reliable during casting.

[0047] Further preferably, all the limiting structures 102 on the first positioning bracket 10 or the second positioning bracket 11 are centrally symmetrically arranged about the center of the positioning bracket, and all the limiting structures 102 are arranged in a circular pattern. This allows each limiting structure 102 on the first positioning bracket 10 and the second positioning bracket 11 to correspond to an anchor bolt, thereby accurately and stably positioning each anchor bolt.

[0048] Further preferably, the longitudinal rods 101 are arranged in a manner that gradually decreases in length from the center of the first positioning bracket 10 or the second positioning bracket 11 to the left and right sides. The transverse rods 100 are arranged in a manner that gradually decreases in length from the center of the first positioning bracket 10 or the second positioning bracket 11 to the upper and lower sides. This facilitates the operation and construction of the first and second positioning brackets while saving materials. The positioning brackets of the present invention can be prefabricated and assembled on-site with anchor bolts, resulting in a small transport volume and convenient on-site assembly.

[0049] Preferably, in the present application, when the first positioning bracket 10 and the second positioning bracket 11 are stacked up and down in a cross shape to form a limiting structure for each anchor bolt, as shown in FIG. Figure 3 As shown, the longitudinal rod 101 of the first positioning bracket 10 is arranged on the left outer side or the right outer side of each anchor bolt 12, that is, as shown in FIG. Figure 3As shown, to the left of the bolt assembly centerline, the longitudinal rod 101 of the first positioning bracket 10 is located on the left outside of each anchor bolt. To the right of the bolt assembly centerline, the longitudinal rod 101 of the first positioning bracket 10 is located on the right outside of each anchor bolt. Furthermore, the outward extension of the end of the longitudinal rod 101 at the intersection with the transverse rod 100 adjacent to the same anchor bolt 12 is no less than the diameter of the anchor bolt. In other words, the length of the longitudinal rod 101 is the sum of the distance between the two outermost symmetrical intersections with the transverse rod 100 and at least twice the diameter of the anchor bolt. This ensures that the end of the longitudinal rod 101 can fully constrain the bolt's outward freedom.

[0050] Preferably, the transverse rod 100 of the first positioning bracket 10 is arranged on the upper inner side or the lower inner side of each anchor bolt 12, that is, with reference to Figure 3 , below the center line of the bolt group, the transverse rod 100 is located on the upper side of each anchor bolt, and above the center line of the bolt group, the transverse rod 100 is located on the lower side of each anchor bolt. Preferably, the length of the transverse rods decreases from the center line of the bolt group outward, and the length of each transverse rod should at least cross with the longitudinal rod close to the same anchor bolt so that it can be welded firmly. The maximum length of the transverse rod should be limited to the first positioning bracket 10 or the second positioning bracket 11 when it is placed in the middle of the anchor bolt group. When it is placed from a vertical position to the middle of the anchor bolt group and then rotated to a horizontal position, the ends of the outer transverse rods will not be blocked by other inner bolts.

[0051] Preferably, the longitudinal rod 101 and the transverse rod 100 of the first positioning bracket 10 or the second positioning bracket 11 are both symmetrically arranged with the center of the plane of the anchor bolt group as the center. After the position and length of the transverse rod 100 and the longitudinal rod 101 are determined, they are arranged in place by crossing, and then the transverse rod 100 and the longitudinal rod 101 are connected and fixed at the intersection to form a single-piece well-shaped positioning bracket. Preferably, the first positioning bracket 10 or the second positioning bracket 11 only limits the freedom of each anchor bolt 12 in two directions, and the first positioning bracket and the second positioning bracket are cross-stacked to form a double-layer well-shaped bracket that limits the freedom of the anchor bolt in four directions. Preferably, the first positioning bracket 10 and the second positioning bracket 11 are positioning brackets of the same specification and size, and the first positioning bracket is rotated 90 degrees in the plane to form the second positioning bracket 11.

[0052] This embodiment provides three different anchor bolt pre-embedded positioning devices as follows:

[0053] like Figures 1 to 5 As shown, Figures 1 to 5 Provides a pre-embedded anchor bolt positioning device suitable for an anchor bolt group consisting of 16 anchor bolts and without a central reinforcement, such as Figure 1 and Figure 2As shown, the first positioning bracket 10 and the second positioning bracket 11 are both formed by 8 longitudinal rods 101 and 8 transverse rods 100 intersecting each other to form a cross-shaped frame, and 16 limiting structures 102 arranged in a circumferential manner are formed at the outermost intersections of the first positioning bracket 10 and the second positioning bracket 11. Therefore, when in use, the 16 anchor bolts can be positioned at the 16 limiting structures 102 respectively, as shown in FIG. Figure 4 As shown. Figure 5 As shown, Figure 5 A flow chart of the assembly of the first positioning bracket and the second positioning bracket to form a pre-embedded anchor bolt positioning device in this embodiment is shown, wherein the anchor bolts are arranged in a circular shape with 16 anchor bolts, and then the first positioning bracket 10 is vertically placed into the anchor bolt group along the longitudinal direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt, and each anchor bolt is limited at the limiting structure 102 of the first positioning bracket, and then the second positioning bracket 11 is vertically placed into the anchor bolt group along the transverse direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt and located above the first positioning bracket 10, and the second positioning bracket limits each anchor bolt in the direction not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-crossed and superimposed up and down to achieve positioning of each anchor bolt 12 in four directions.

[0054] like Figures 6 to 9 As shown, Figures 6 to 9 Provides an anchor bolt pre-embedded positioning device suitable for an anchor bolt group consisting of 8 anchor bolts and without a central rib. Figure 6 and Figure 7 As shown, the first positioning bracket 10 and the second positioning bracket 11 are both formed by four longitudinal rods 101 and four transverse rods 100 intersecting each other to form a cross-shaped frame, and eight limiting structures 102 arranged in a circumferential manner are formed at the outermost intersection of the first positioning bracket 10 and the second positioning bracket 11. Therefore, when in use, the eight anchor bolts can be positioned at the eight limiting structures 102 respectively, as shown in FIG. Figure 8 As shown. Figure 9 As shown, Figure 9The flowchart of the assembly of the first positioning bracket and the second positioning bracket to form the anchor bolt pre-embedded positioning device in this embodiment is shown, the first positioning bracket 10 is vertically placed in the anchor bolt group along the longitudinal direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt, and each anchor bolt is limited at the limiting structure of the first positioning bracket, and then the second positioning bracket 11 is vertically placed in the anchor bolt group along the transverse direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt and located above the first positioning bracket 10, and the second positioning bracket limits each anchor bolt in the direction not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-crossed and superimposed up and down to achieve positioning of each anchor bolt 12 in four directions.

[0055] like Figures 10 to 13 As shown, Figures 10 to 13 A pre-embedded anchor bolt positioning device suitable for an anchor bolt group consisting of four anchor bolts and having no central rib is provided. The first positioning bracket 10 and the second positioning bracket 11 are both formed into a crisscross frame by two longitudinal rods 101 and two transverse rods 100. Four circularly arranged limiting structures 102 are formed at the outermost intersections of the first positioning bracket 10 and the second positioning bracket 11. Therefore, when in use, the four anchor bolts can be positioned at the four limiting structures 102, respectively. Figure 12 As shown. Figure 13 As shown, Figure 13 The flowchart of the assembly of the first positioning bracket and the second positioning bracket to form the anchor bolt pre-embedded positioning device in this embodiment is shown, the first positioning bracket 10 is vertically placed in the anchor bolt group along the longitudinal direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt, and each anchor bolt is limited at the limiting structure 102 of the first positioning bracket, and then the second positioning bracket 11 is vertically placed in the anchor bolt group along the transverse direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt and located above the first positioning bracket 10, and the second positioning bracket limits each anchor bolt in the direction not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-crossed and superimposed up and down to achieve positioning of each anchor bolt 12 in four directions.

[0056] The anchor bolt pre-embedded positioning device of this embodiment has a simple structure, is quick and convenient to install, and greatly improves the stability and integrity of the anchor bolts.

[0057] Example 2

[0058] This embodiment 2 provides another anchor bolt pre-embedded positioning device. The anchor bolt pre-embedded positioning device provided in this embodiment is suitable for situations where there is a vertical rib in the center of the anchor bolt group. The difference from embodiment 1 is:

[0059] like Figures 14 to 23 As shown, the first positioning bracket 10 and the second positioning bracket 11 also include a giving way structure 103, which is used to give way to the vertical rib 13 to prevent the first positioning bracket 10 and the second positioning bracket 11 from being stuck on the vertical rib 13, so that the first positioning bracket 10 and the second positioning bracket 11 cannot be placed horizontally. Preferably, the giving way structure 103 is a notch structure extending longitudinally outward from the center of the positioning bracket. When in use, the giving way structure 103 is placed vertically upward or downward into the middle of the anchor bolt, and then the positioning bracket is placed horizontally. The giving way structure avoids interference with the central vertical rib when the positioning bracket is placed horizontally. Preferably, in order to increase the strength of the positioning bracket, reinforcing rods 104 are provided on both sides of the notch structure, and the reinforcing rods 104 are arranged parallel to the longitudinal rod 101. Alternatively, preferably, the reinforcing rods 104 are arranged at an angle to the longitudinal rod 101. So that the strength of the positioning bracket can be further strengthened by the reinforcing rods 104.

[0060] This embodiment provides an anchor bolt pre-embedded positioning device suitable for an anchor bolt group consisting of 8 anchor bolts and having a vertical rib in the center. When the first positioning bracket 10 and the second positioning bracket 11 have 8 limiting structures 102, the middle part of the first positioning bracket 10 and the second positioning bracket 11 is further provided with a giving structure 103, such as Figure 14 and Figure 15 As shown, reinforcing rods 104 are provided on both sides of the first positioning bracket 10 and the second positioning bracket 11 so as to be parallel to the longitudinal rod 101. Figure 14 As shown, both ends of the reinforcing rod 104 of the first positioning bracket 10 protrude outward from the outermost intersection of the reinforcing rod 104 and the transverse rod 100, and the reinforcing rod 104 extending outward can form a limiting structure 102 for the anchor bolt 12 in three directions at the outermost intersection of the first positioning bracket 10 with the longitudinal rod 101 and the transverse rod 100. Figure 14 As shown, one end of the reinforcing rod 104 of the second positioning bracket 11 protrudes outward from the outermost intersection thereof with the transverse rod 100, and the outwardly extending reinforcing rod 104 can form a limiting structure 102 for the anchor bolt 12 in three directions at the outermost intersection of the second positioning bracket 11 with the longitudinal rod 101 and the transverse rod 100. In this embodiment, the reinforcing rod 104 not only increases strength, but also, together with the longitudinal rod and transverse rod, limits the anchor bolt. Figure 17The flowchart of the assembly of the first positioning bracket and the second positioning bracket to form the anchor bolt pre-embedded positioning device in this embodiment is shown, the first positioning bracket 10 is vertically placed in the anchor bolt group along the longitudinal direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt, and each anchor bolt is limited at the limiting structure 102 of the first positioning bracket, and then the second positioning bracket 11 is vertically placed in the anchor bolt group along the transverse direction, and then rotated 90 degrees to make it perpendicular to the anchor bolt and located above the first positioning bracket 10, and the second positioning bracket limits each anchor bolt in the direction not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-crossed and superimposed up and down to achieve positioning of each anchor bolt 12 in four directions.

[0061] like Figures 20 to 21 As shown, this embodiment also provides an anchor bolt pre-embedded positioning device suitable for an anchor bolt group consisting of four anchor bolts and having a vertical rib in the center. When the first positioning bracket 10 and the second positioning bracket 11 have four limiting structures 102, a clearance structure 103 is further provided in the middle of the first positioning bracket 10 and the second positioning bracket 11. Reinforcement rods 104 are provided on both sides of the clearance structure 103. The two reinforcement rods 104 are arranged obliquely relative to the longitudinal rod 101 and form a triangular structure with the longitudinal rod 101. Preferably, a support rod 105 is further provided on the reinforcement rod 104 of the triangular structure. The support rod 105 is parallel to the transverse rod 100 and is arranged to intersect with the two reinforcement rods 104. Since the longitudinal rod and transverse rod structure of the positioning device suitable for pre-embedded positioning of four anchor bolts are simple, in order to ensure the strength of the positioning bracket, two obliquely arranged reinforcement rods and support rods are provided to enhance the strength and stability of the positioning bracket.

[0062] Example 3

[0063] This embodiment provides a construction method for a pre-embedded anchor bolt positioning device applicable to the embodiment 1 (when there is no vertical reinforcement in the center of the anchor bolt group), comprising the following steps:

[0064] Step 1: Lay the bottom steel bar 23 of the tower crane foundation; and build a support frame 22 for supporting the pre-buried special chassis 20 of the foundation above the bottom steel bar 23, such as Figure 24 and Figure 25 shown.

[0065] Preferably, when there is no vertical rib in the center of the anchor bolt group, the structure of the support frame 22 is as follows: Figure 26 and Figure 27 As shown, Figure 26 and Figure 27A schematic diagram of the structure of a support frame 22 according to a preferred embodiment is shown. Preferably, the support frame 22 is positioned above the foundation's underlying reinforcement bars 23. The support frame 22 includes four corner vertical bars 220, diagonal vertical bars 222, and a support crosspiece 221. In this embodiment, the tops of the four corner vertical bars 220 are located at the foundation's horizontal elevation, flush with the support crosspiece 221. The tops of the four corner vertical bars 220 do not protrude beyond the support crosspiece 221. When the pre-embedded foundation chassis 20 is installed on the support frame 22, the bottom of the pre-embedded foundation chassis 20 rests on the horizontal support crosspiece 221, located at the foundation's horizontal elevation. The four corner vertical bars 220 are positioned outside the anchor bolt assembly at each corner, leaving no vertical bars in the center of the anchor bolt assembly. Preferably, the four corners of the support crosspiece 221 of the support frame 22 maintain a horizontality of 0.1%. Preferably, the pre-embedded foundation chassis 20 is a conventional pre-embedded foundation chassis.

[0066] Step 2: Install the foundation embedded special chassis 20 onto the support frame 22, and install a corresponding number of anchor bolts 12 at the four corner bolt holes of the foundation embedded special chassis 20 to form an anchor bolt group at each corner, and tighten the top of the anchor bolt 12 with the double nut 21.

[0067] Step 3: Place the first positioning bracket 10 vertically in the middle of the anchor bolt group along the first direction, parallel to the anchor bolt 12, and then rotate the first positioning bracket 10 90 degrees to place it horizontally so that it is perpendicular to the anchor bolt 12, and limit at least two directions of each anchor bolt 12 to the limiting structure 102 of the first positioning bracket 10. Figure 22 Shown and Figure 23 shown.

[0068] Step 4: Place the second positioning bracket 11 vertically and in parallel with the anchor bolt 12 in the middle of the anchor bolt group along the second direction, then rotate the second positioning bracket 11 90 degrees and place it horizontally so that it is perpendicular to the anchor bolt 12 and is located above the first positioning bracket 10. The second positioning bracket 11 can limit the direction of each anchor bolt 12 that is not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-stacked up and down to achieve the positioning of each anchor bolt 12 in four directions. Figure 22 and Figure 23 As shown, preferably, the first direction and the second direction are perpendicular to each other.

[0069] Step 5: Move the stacked first and second positioning brackets 10, 11 to the bottom of the anchor bolt assembly, keeping them as far away from the upper threads as possible to ensure the verticality and dimensional accuracy of the anchor bolts. Use connecting steel bars 25 to securely connect the first and second positioning brackets 10, 11 to the four corner reinforcement bars 220 and the bottom layer of reinforcement bars 23, respectively, and then lay the foundation reinforcement bars.

[0070] Step 6: After the foundation reinforcement is laid, pour concrete to the bottom plane of the foundation embedded special chassis 20. When the concrete solidifies to a certain strength, remove the embedded special chassis 20, and then install the four legs of the tower crane at the four corners respectively.

[0071] Preferably, after the foundation reinforcement is laid and before pouring concrete, the exposed threads of all anchor bolt heads are wrapped with plastic for protection. Protecting the threads improves positioning accuracy. Preferably, when disassembling the pre-embedded dedicated chassis 10, first disassemble the chassis frame, then remove all nuts at the four corners one by one, and then remove the four pre-embedded chassis base plates one by one and move them away.

[0072] Example 4

[0073] This embodiment provides another construction method of a pre-embedded anchor bolt positioning device applicable to the embodiment 1 (when there is no vertical reinforcement in the center of the anchor bolt group), including the following steps:

[0074] Step 1: Lay the bottom steel bar 23 of the tower crane foundation; and build a support frame 22 for supporting the pre-embedded combined positioning chassis 26 above the bottom steel bar 23, such as Figure 30 shown.

[0075] Preferably, when there is no vertical rib in the center of the anchor bolt group, the structure of the support frame 22 is as follows: Figure 26 and Figure 27 As shown, Figure 26 and Figure 27 A schematic diagram of the structure of a support frame 22 according to a preferred embodiment is shown. Preferably, the support frame 22 is positioned above the foundation's bottom layer of steel bars 23. The support frame 22 includes four corner vertical bars 220, diagonal vertical bars 222, and a support crossbar 221. In this embodiment, the tops of the four corner vertical bars 220 are located at the foundation's horizontal elevation, flush with the support crossbar 221. The tops of the four corner vertical bars 220 do not protrude beyond the support crossbar 221. When the foundation pre-embedded combined positioning chassis 26 is installed above the support frame 22, the bottom of the foundation pre-embedded combined positioning chassis 26 rests on the horizontal support crossbar 221 at the foundation's horizontal elevation. The four corner vertical bars 220 are positioned outside the anchor bolt assembly at each corner, leaving no vertical bars in the center of the anchor bolt assembly. Preferably, the horizontality of the four corners of the support crossbar 221 of the support frame 22 is maintained at 0.1%.

[0076] Step 2: Install the foundation embedded combined positioning chassis 26 onto the support frame 22, and install a corresponding number of anchor bolts 12 at the bolt holes of the foundation embedded combined positioning chassis 26 to form an anchor bolt group at each corner, and tighten the top of the anchor bolt 12 with the double nut 21.

[0077] Preferably, in this embodiment, Figure 28 and Figure 29 As shown, the pre-embedded foundation combined positioning chassis includes a third positioning bracket 14, a fourth positioning bracket 15 and a square washer 16. The pre-embedded foundation combined positioning chassis is formed by the third positioning bracket 14 and the fourth positioning bracket 15 being stacked up and down in a cross shape to form bolt holes for positioning the anchor bolts. The square washer 16 is arranged on top of the fourth positioning bracket 15 located above. Preferably, as Figure 28 As shown, the third positioning bracket 14 and the fourth positioning bracket 15 are formed by the intersection of at least two longitudinal rods 101 and at least two transverse rods 100, wherein the ends of the longitudinal rods 101 protrude outward from the outermost intersections with the transverse rods 100 and form a limiting structure for the anchor bolts 12 in at least two directions at the outermost intersections of the positioning brackets. Preferably, as Figure 29 As shown, the number of longitudinal rods 101 of the third positioning bracket 14 is twice the number of transverse rods 100, so that at each limiting structure of the third positioning bracket 14, two longitudinal rods 101 and transverse rods 100 form a limit for the anchor bolts in three directions. During installation, the third positioning bracket 14 and the fourth positioning bracket 15 are sequentially cross-stacked on top of the support frame 22. The limiting structures of the third and fourth positioning brackets are cross-stacked up and down to position the upper part of the anchor bolt group. Square washers are provided above the fourth positioning bracket and at each limiting structure, so that the third positioning bracket 14, the fourth positioning bracket 15, and the square washers 16 form a basic pre-embedded combined positioning chassis.

[0078] Step 3: Place the first positioning bracket 10 vertically in the middle of the anchor bolt group along the first direction, parallel to the anchor bolt 12, and then rotate the first positioning bracket 10 90 degrees to place it horizontally so that it is perpendicular to the anchor bolt 12, and limit at least two directions of each anchor bolt 12 to the limiting structure 102 of the first positioning bracket 10. Figure 22 Shown and Figure 23 shown.

[0079] Step 4: Place the second positioning bracket 11 vertically and in parallel with the anchor bolt 12 in the middle of the anchor bolt group along the second direction, then rotate the second positioning bracket 11 90 degrees and place it horizontally so that it is perpendicular to the anchor bolt 12 and is located above the first positioning bracket 10. The second positioning bracket 11 can limit the direction of each anchor bolt 12 that is not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-stacked up and down to achieve the positioning of each anchor bolt 12 in four directions. Figure 22 and Figure 23 As shown, preferably, the first direction and the second direction are perpendicular to each other.

[0080] Step 5: Move the stacked first and second positioning brackets 10, 11 to the bottom of the anchor bolt assembly, keeping them as far away from the upper threads as possible to ensure the verticality and dimensional accuracy of the anchor bolts. Use connecting steel bars 25 to securely connect the first and second positioning brackets 10, 11 to the four corner reinforcement bars 220 and the bottom layer of reinforcement bars 23, respectively, and then lay the foundation reinforcement bars.

[0081] Step 6: After the foundation reinforcement is laid, pour concrete to the bottom plane of the foundation embedded combined positioning chassis 26. When the concrete solidifies to a certain strength, remove the pre-foundation embedded combined positioning chassis 26, and then install the four legs of the tower crane at the four corners respectively.

[0082] Preferably, after the foundation reinforcement is laid and before pouring concrete, all exposed thread parts of the anchor bolt heads are wrapped with plastic to protect them. Protecting the threads improves positioning accuracy.

[0083] Example 5

[0084] This embodiment provides a construction method for a pre-embedded anchor bolt positioning device applicable to the embodiment 2 (when there is a vertical rib at the center of the anchor bolt group), including the following steps:

[0085] Step 1: If Figure 31 and Figure 32 As shown, the bottom steel bars 23 of the tower crane foundation are laid; and a support frame 22 for supporting the foundation embedded chassis 20 is built above the bottom steel bars 23 .

[0086] Preferably, when there is a vertical rib in the center of the anchor bolt group, the structure of the support frame 22 is as follows: Figure 33 and Figure 34 As shown, Figure 33 and Figure 34The structural diagram of the support frame 22 of another preferred embodiment is shown. Preferably, the support frame 22 is arranged above the bottom reinforcement 23 of the foundation. The support frame 22 includes four corner vertical bars 220, middle vertical bars 223, oblique vertical bars 222 and support cross bars 221. In this embodiment, the four corner vertical bars 220 are arranged at the center position of the four corner anchor bolt group, and the elevation of the top of the four corner vertical bars 220 is consistent with the elevation of the upper plane of the foundation. A support cross bar 221 is set below it at a position approximately the thickness of the concrete protective layer and connected to the four corner vertical bars to form an integral whole, so that the horizontality of the four corners of the support frame 22 is maintained at 0.1%. The foundation embedded chassis 20 is installed to the top of the four corner vertical bars 220 and kept horizontal. At this time, the four corner vertical bars 220 are the center vertical bars 13 of the bolt group.

[0087] Step 2: Install the foundation embedded special chassis 20 onto the support frame 22, and install a corresponding number of anchor bolts 12 at the four corner bolt holes of the foundation embedded special chassis 20 to form an anchor bolt group at each corner, and tighten the top of the anchor bolt 12 with the double nut 21.

[0088] Step 3: Place the first positioning bracket 10 vertically in the middle of the anchor bolt group along the first direction, parallel to the anchor bolt 12, and then rotate the first positioning bracket 10 90 degrees to place it horizontally so that it is perpendicular to the anchor bolt 12, and limit at least two directions of each anchor bolt 12 to the limiting structure 102 of the first positioning bracket 10. Figure 22 Shown and Figure 23 shown.

[0089] Step 4: Place the second positioning bracket 11 vertically and in parallel with the anchor bolt 12 in the middle of the anchor bolt group along the second direction, then rotate the second positioning bracket 11 90 degrees and place it horizontally so that it is perpendicular to the anchor bolt 12 and is located above the first positioning bracket 10. The second positioning bracket 11 can limit the direction of each anchor bolt 12 that is not limited by the first positioning bracket 10; and then the first positioning bracket 10 and the second positioning bracket 11 are cross-stacked up and down to achieve the positioning of each anchor bolt 12 in four directions. Figure 22 and Figure 23 As shown, preferably, the first direction and the second direction are perpendicular to each other.

[0090] Step 5: Move the stacked first and second positioning brackets 10, 11 to the bottom of the anchor bolt assembly, keeping them as far away from the upper threads as possible to ensure the verticality and dimensional accuracy of the anchor bolts. Use connecting steel bars 25 to securely connect the first and second positioning brackets 10, 11 to the four corner reinforcement bars 220 and the bottom layer of reinforcement bars 23, respectively, and then lay the foundation reinforcement bars.

[0091] Step 6: After the foundation reinforcement is laid, pour concrete to the bottom plane of the pre-embedded special chassis 20. When the concrete solidifies to a certain strength, remove the pre-embedded special chassis 20 and then install the four legs of the tower crane at the four corners.

[0092] Preferably, after the foundation reinforcement is laid and before pouring concrete, the exposed threads of all anchor bolt heads are wrapped with plastic for protection. Protecting the threads improves positioning accuracy. Preferably, when disassembling the pre-embedded dedicated chassis 20, first disassemble the chassis frame, remove all nuts at the four corners one by one, and then remove the four pre-embedded chassis base plates one by one and move them away.

[0093] The construction method of the anchor bolt pre-embedded positioning device of the present invention is convenient and quick to operate, requiring no welding, which does not affect the strength of the anchor bolts, and eliminating the need for upper and lower nuts to clamp to the base plate. Removing the mold after casting is easy and does not affect subsequent use of the mold. To remove the mold, simply remove the frame and then remove the molds at the four corners. The anchor bolt pre-embedded positioning device and construction method of the present invention are suitable for pre-embedded anchor bolts in construction cranes, towers, electric poles, light poles, steel columns, and other applications where the anchor bolts are distributed circumferentially.

[0094] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0095] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0096] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A pre-embedded positioning device for anchor bolts, characterized in that: The invention comprises a first positioning bracket (10) and a second positioning bracket (11), wherein the first positioning bracket (10) and the second positioning bracket (11) are both cross-shaped brackets formed by at least two longitudinal bars (101) and at least two transverse bars (100) intersecting each other, wherein the ends of the longitudinal bars (101) protrude outward from the outermost intersections with the transverse bars (100) and form a limiting structure (102) for the anchor bolts (12) in at least two directions at the outermost intersections of the positioning brackets, and the first positioning bracket (10) and the second positioning bracket (11) are stacked up and down in a cross-shaped manner to position each anchor bolt (12) in four directions.

2. The anchor bolt pre-embedded positioning device according to claim 1, characterized in that: All the limiting structures (102) on the first positioning bracket (10) or the second positioning bracket (11) are arranged in a centrosymmetrical manner about the center of the positioning bracket, and all the limiting structures (102) are arranged in a circular manner.

3. The anchor bolt pre-embedded positioning device according to claim 2, characterized in that: The longitudinal rod (101) is arranged in a manner of gradually decreasing length from the center of the first positioning bracket (10) or the second positioning bracket (11) to the left and right sides, and the transverse rod (100) is arranged in a manner of gradually decreasing length from the center of the first positioning bracket (10) or the second positioning bracket (11) to the upper and lower sides.

4. The anchor bolt pre-embedded positioning device according to claim 2, characterized in that: The first positioning bracket (10) and the second positioning bracket (11) further include a yielding structure (103), wherein the yielding structure (103) is a notch structure extending longitudinally outward from the center of the positioning bracket, and reinforcing rods (104) are provided on both sides of the notch structure, wherein the reinforcing rods (104) are arranged parallel to the longitudinal rods (101), or the reinforcing rods (104) are arranged at an angle to the longitudinal rods (101).

5. The anchor bolt pre-embedded positioning device according to any one of claims 1 to 3, characterized in that: The first positioning bracket (10) and the second positioning bracket (11) are both cross-shaped brackets formed by 8 longitudinal rods (101) and 8 transverse rods (100) intersecting each other, and 16 limiting structures (102) arranged in a circumferential manner are formed at the outermost intersections of the first positioning bracket (10) and the second positioning bracket (11); or, The first positioning bracket (10) and the second positioning bracket (11) are both cross-shaped brackets formed by four longitudinal rods (101) and four transverse rods (100) intersecting each other, and eight limiting structures (102) arranged in a circumferential manner are formed at the outermost intersections of the first positioning bracket (10) and the second positioning bracket (11); or, The first positioning bracket (10) and the second positioning bracket (11) are both crisscross-shaped brackets formed by two longitudinal rods (101) and two transverse rods (100), and four limiting structures (102) arranged in a circular pattern are formed at the outermost intersections of the first positioning bracket (10) and the second positioning bracket (11).

6. The anchor bolt pre-embedded positioning device according to claim 5, characterized in that: When the first positioning bracket (10) and the second positioning bracket (11) have eight limiting structures (102), a middle portion of the first positioning bracket (10) and the second positioning bracket (11) is further provided with a giving structure (103), and reinforcing rods (104) arranged parallel to the longitudinal rod (101) are provided on both sides of the giving structure (103), at least one end of the reinforcing rod (104) protrudes from the outermost intersection point between the reinforcing rod (104) and the transverse rod (100) and extends outward, and the outwardly extended reinforcing rod (104) can form a limiting structure (102) for the anchor bolt (12) in three directions at the outermost intersection point of the first positioning bracket (10) and the second positioning bracket (11).

7. The anchor bolt pre-embedded positioning device according to claim 5, characterized in that: When the first positioning bracket (10) and the second positioning bracket (11) have four limiting structures (102), a middle portion of the first positioning bracket (10) and the second positioning bracket (11) is further provided with a yielding structure (103), and reinforcing rods (104) are provided on both sides of the yielding structure (103), and the two reinforcing rods (104) are arranged obliquely relative to the longitudinal rod (101) and form a triangular structure with the longitudinal rod (101).

8. The anchor bolt pre-embedded positioning device according to claim 7, characterized in that: A support rod (105) is further provided on the reinforcing rod (104) of the triangular structure. The support rod (105) is parallel to the transverse rod (100) and is arranged to intersect with the two reinforcing rods (104).

9. A construction method for a pre-embedded anchor bolt positioning device, characterized in that: The steps include: (1) Laying the bottom steel bars (23) of the tower crane foundation; and constructing a support frame (22) for supporting the pre-buried chassis of the foundation above the bottom steel bars (23); (2) Installing the pre-embedded foundation chassis onto the support frame (22), and installing a corresponding number of anchor bolts (12) at the bolt holes formed in the pre-embedded foundation chassis to form an anchor bolt group at each corner, and tightening the tops of the anchor bolts (12) with double nuts (21); The pre-embedded foundation chassis comprises a pre-embedded foundation dedicated chassis or a pre-embedded foundation combined positioning chassis, wherein the pre-embedded foundation combined positioning chassis comprises a third positioning bracket (14), a fourth positioning bracket (15) and a square washer (16), and the pre-embedded foundation combined positioning chassis is formed by the third positioning bracket (14) and the fourth positioning bracket (15) being stacked up and down in a cross shape to form bolt holes for positioning anchor bolts, and the square washer (16) is arranged on top of the fourth positioning bracket (15) located above; (3) placing the first positioning bracket (10) vertically in the middle of the anchor bolt group in parallel with the anchor bolt (12) along a first direction, then rotating the first positioning bracket (10) by 90° and placing it horizontally so that it is perpendicular to the anchor bolt (12), and each anchor bolt (12) is respectively limited on the limiting structure (102) of the first positioning bracket (10); (4) The second positioning bracket (11) is placed vertically and in parallel with the anchor bolt (12) in the middle of the anchor bolt group along the second direction, and then the second positioning bracket (11) is rotated 90 degrees and placed horizontally so that it is perpendicular to the anchor bolt (12) and is located above the first positioning bracket (10). The second positioning bracket (11) can limit each anchor bolt (12) in the direction not limited by the first positioning bracket (10); and each anchor bolt (12) is positioned in four directions by cross-over and stacking the first positioning bracket (10) and the second positioning bracket (11).

10. The construction method according to claim 9, characterized in that: Also includes: (5) moving the stacked first positioning bracket (10) and the second positioning bracket (11) to the bottom of the anchor bolt group, using the connecting steel bars (25) to fix the first positioning bracket (10) and the second positioning bracket (11) to the four corner vertical bars of the support frame (22) and the bottom steel bars (23), and then laying the foundation surface bars; (6) After the foundation reinforcement is laid, pour concrete to the bottom plane of the foundation embedded chassis. When the concrete solidifies to a certain strength, remove the foundation embedded chassis, and then install the four legs of the tower crane at the four corners.

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