A square steel column construction limiting guide device and construction method

Abstract

The present invention discloses a square steel column construction limit guide device and construction method, including: a lower frame, which is fixed on the ground directly above the bored pile and the middle part is vertically penetrated; a steel bar locator, which is arranged on the top surface of the lower frame and is used to position the main reinforcement of the steel cage of the bored pile; an upper frame, which is fixed on the top of the lower frame, and the middle part of the upper frame is provided with a square limit hole, which is vertically penetrated; a square steel column limiter, which is a square ring structure continuously arranged along the circumference of the square limit hole and is plugged with the square steel column in the vertical direction. The present invention arranges the limit guide device in layers according to the construction structure, the lower frame is used to locate the relative position of the steel cage and the square steel column, and the upper frame is used to provide limit guide for the sinking of the square steel column, which realizes the control of the sinking direction and verticality of the square steel column from the structure, improves the connection accuracy of the steel cage and the square steel column, and effectively improves the construction quality.

Description

Technical Field

[0001] The present invention relates to the technical field of underground foundation construction, and more specifically, to a square steel column construction limiting guide device and a construction method. Background Art

[0002] In the construction of underground foundation structures, in order to solve the problems of excessive axial compression ratio and excessive column cross-section size that occur when ordinary concrete is used, square steel columns are usually selected as the main load-bearing structure of the vertical force of the underground structure. Its manufacturing quality and installation accuracy are crucial to the safety of the underground structure. During the construction process, the square steel column needs to be connected with the bored pile below. Due to the limitations of construction space and construction height, the installation accuracy between the square steel column and the bored pile is difficult to guarantee.

[0003] Therefore, there is an urgent need for a square steel column construction limiting guide device, which can be used in conjunction with a corresponding limiting guide method to limit the square steel column, ensure the precise docking of the steel cage and the square steel column, and ensure the construction quality. Summary of the invention

[0004] The purpose of the present invention is to provide a square steel column construction limit guide device and a construction method. The limit guide device is arranged in layers according to the construction structure. The lower frame is used to locate the relative position of the steel cage and the square steel column, and the upper frame is used to provide limit guide for the sinking of the square steel column. The sinking position and verticality of the square steel column are controlled structurally, and the square steel column is assembled in layers according to the square steel column structure, which improves the connection accuracy between the steel cage and the square steel column and effectively improves the construction quality.

[0005] In order to achieve these purposes and other advantages according to the present invention, a square steel column construction limiting guide device is provided, comprising:

[0006] The lower frame is a three-dimensional frame structure fixed on the ground directly above the bored piles and the middle part is vertically penetrated;

[0007] A steel bar locator, which is horizontally arranged on the top surface of the lower frame and detachably connected thereto, and the steel bar locator is configured to locate the main reinforcement of the steel cage of the bored pile;

[0008] The upper frame is a three-dimensional frame structure and is fixed on the top of the lower frame. A square limiting hole is provided in the middle of the upper frame and penetrates in the vertical direction;

[0009] The square steel column limiter is a square ring structure continuously arranged along the circumference of the square limit hole and fixed on the inner wall of the square limit hole. The square steel column is plugged into the square steel column limiter in the vertical direction, and the mid-point of the square steel column limiter coincides with the axis of the steel cage.

[0010] Preferably, the square steel column construction limit guide device also includes a plurality of bases, which are arranged at intervals at the bottom of the lower frame, and any base includes a bottom plate, a surface of which is provided with a plurality of vertical through holes at intervals and fixedly connected to the embedded steel bars in the ground hardened layer; a connecting block, which is arranged on the bottom plate and fixedly connected to the bottom of the lower frame; and a plurality of limit plates, which are arranged at intervals along the circumference of the connecting block, and any limit plate is fixedly connected to the connecting block and the bottom plate.

[0011] Preferably, the square steel column construction limit guide device, the steel bar locator includes a platform plate, which is horizontally arranged and erected on the top surface of the lower frame, and the two ends of the platform plate are detachably connected to the lower frame; a plurality of positioning through holes, which are arranged in the middle of the platform plate, and the plurality of positioning through holes are distributed along a circle with the center point of the platform plate as the center and the radius of the steel cage as the radius, and the plurality of positioning through holes correspond one-to-one to the plurality of main bars of the steel cage.

[0012] Preferably, the square steel column is constructed with a limiting guide device, and the platform plate is further provided with an installation through-hole, which is located on the inner side of the plurality of positioning through-holes and is not connected thereto.

[0013] Preferably, the square steel column construction limit guide device, the upper frame body includes two layers of brackets, each layer of brackets includes a plurality of columns, which are vertically spaced and arranged on the same plane; a plane frame, which is fixed to the top of the plurality of columns in the horizontal direction, and the middle part of the plane frame is provided with the square limit hole;

[0014] Wherein, the two-layer support includes an upper layer support and a lower layer support, the columns of the lower layer support are fixed on the top surface of the lower frame body, and the columns of the upper layer support are fixed on the top surface of the plane frame of the lower layer support.

[0015] Preferably, the square steel column is constructed as a limiting guide device, and the upper frame also includes a walkway plate, which is laid on the plane frame of the upper support and fills the frame gaps except the square limiting holes, and the walkway plate and the plane frame of the upper support together constitute an upper platform.

[0016] The present invention also provides a construction method of a square steel column construction limiting guide device, comprising:

[0017] S1. Apply a ground hardening layer on the ground near the bored piles;

[0018] S2. Using a total station to measure and place the installation positions of the square steel columns and the limit guide device on the ground hardened layer;

[0019] S3, using a hoisting device to hoist the steel cage of the bored pile, and lowering it along the completed pile hole, when the top of the steel cage is lowered to the hole near the pile hole, installing a support beam on the ground around the pile hole and suspending the steel cage on the support beam;

[0020] S4, installing the lower frame and the steel bar positioner on the ground hardened layer according to the measured position of the limit guide device in S2;

[0021] S5, reconnecting the steel cage to the hoisting equipment and removing the support beam, controlling the movement of the steel cage by the hoisting equipment, aligning the top ends of the multiple main bars of the steel cage with the multiple positioning holes on the steel bar positioner one by one, installing the support beam again, suspending the steel cage at the position where the positioning is completed, and removing the steel bar positioner;

[0022] S6. Install a connecting plate on the bottom outer wall of the square steel column, wherein the connecting plate is horizontally arranged and has a plurality of connecting through holes on its surface, which correspond one to one with the plurality of main bars of the steel cage, and use a lifting device to lift the square steel column and lower it along the pile hole until the bottom of the square steel column is close to the top of the steel cage;

[0023] S7, installing the upper frame and the square steel column stopper on the lower frame according to the measured and placed position of the square steel column in S2, wherein the square steel column stopper is sleeved on the outer side of the square steel column;

[0024] S8, using a lifting device to continue lowering the square steel column under the limiting action of the square steel column limiter, so that the multiple connecting through holes on the connecting plate are matched and plugged with the multiple main bars of the steel cage, and after fixing the connecting through holes with the corresponding main bars, remove the support beam;

[0025] S9. Use a lifting device to lower the square steel column and the steel cage as a whole to the designed elevation under the limiting action of the square steel column limiter, then pour concrete for the bored piles, and remove the limiting guide device after the concrete strength meets the requirements.

[0026] Preferably, in the construction method of the square steel column construction limiting guide device, in S6, before the square steel column is lifted, a plurality of marking points are set at intervals along the height direction on the outer wall of the square steel column, and the distance between two adjacent marking points is fixed; in S9, when the square steel column is lowered, the coordinates of the plurality of marking points on the square steel column are read at fixed intervals using a total station, and the verticality of the square steel column is calculated based on the coordinates of the plurality of marking points at different times.

[0027] Preferably, in the construction method of the square steel column construction limiting guide device, in S6, the connecting plates are multiple ring plates spaced apart along the height direction of the square steel column, any ring plate is provided with the multiple connecting through holes, and the outer ends of two adjacent ring plates are fixedly connected by axillary plates.

[0028] The present invention has at least the following beneficial effects:

[0029] 1. The present invention sets a multi-layer frame, wherein the lower frame is used to locate the relative position of the steel cage and the square steel column, and the upper frame is used to provide a limit guide for the sinking of the other steel column, thereby realizing the control of the offset and verticality of the sinking of the other steel column from a structural point of view, and realizing the precise sinking of the square steel column, thereby improving its stability as a vertical support structure and the connection accuracy with the bored piles below, and effectively ensuring the overall construction quality;

[0030] 2. The present invention arranges the limit guide device in layers according to the construction structure, and assembles it in steps during the sinking construction of the square steel column. After using the lower frame and the steel bar locator to position the main bars of the steel cage, the upper frame and the square steel column limiter are assembled. The steel cage and the square steel column can be accurately docked conveniently, and the limit guide during the sinking of the square steel column can be realized. The square steel column and the steel cage are lowered synchronously after the docking is completed. The construction method is simple and efficient, which reduces manpower investment and construction risks and improves construction efficiency.

[0031] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a position limiting guide device according to an embodiment of the present invention;

[0033] Figure 2 is a side sectional view of the position limiting guide device described in the above embodiment;

[0034] Figure 3 It is a schematic diagram of the connection structure between the lower frame and the steel bar positioner in the above embodiment;

[0035] Figure 4 is a schematic diagram of the structure of the steel bar positioner described in the above embodiment;

[0036] Figure 5 is a schematic structural diagram of the base described in the above embodiment;

[0037] Figure 6 It is a schematic diagram of the construction structure of the connection between the square steel column and the steel cage in the above embodiment.

[0038] Description of reference numerals:

[0039] 1. Lower frame; 2. Steel bar positioner; 21. Platform plate; 22. Positioning perforation; 23. Installation perforation; 31. Upper bracket; 32. Lower bracket; 33. Column; 34. Plane frame; 35. Walkway plate; 4. Square steel column limiter; 5. Base; 51. Bottom plate; 52. Connecting block; 53. Limiting plate; 6. Square steel column; 61. Connecting plate; 7. Pile hole; 8. Steel bar cage. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0041] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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 invention and simplifying the description, and do not indicate or imply 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 invention.

[0042] like Figure 1-6 As shown, the present invention provides a square steel column construction limiting guide device, comprising:

[0043] The lower frame 1 is a three-dimensional frame structure fixed on the ground directly above the bored piles and the middle part is vertically penetrated;

[0044] A steel bar positioner 2, which is horizontally arranged on the top surface of the lower frame 1 and detachably connected thereto, and the steel bar positioner 2 is configured to position the main reinforcement of the steel cage of the bored pile;

[0045] The upper frame is a three-dimensional frame structure and is fixed on the top of the lower frame 1. A square limiting hole is provided in the middle of the upper frame and penetrates in the vertical direction;

[0046] The square steel column limiter 4 is a square ring structure continuously arranged along the circumference of the square limit hole and fixed on the inner wall of the square limit hole. The square steel column 6 is plugged into the square steel column limiter 4 in the vertical direction, and the mid-point perpendicular line of the square steel column limiter 4 coincides with the axis of the steel cage 8.

[0047] In the above technical scheme, the lower frame 1 includes two layers of plane frames distributed up and down, and the two layers of plane frames are connected by multiple vertical rods, which are distributed around the plane frames. Any layer of the plane frame includes a frame, which is a closed annular plane structure; multiple internal support frames, any internal support frame is arranged between two adjacent side edges on the frame and fixed thereto, and the entire plane frame is arranged horizontally. It can be seen that the middle part of the lower frame 1 is in a hollow state, and the part of the plane frame located on the inner side of the internal support frame is not provided with any bracket, so that the part of the space close to the vertical line in the lower frame is penetrated in the vertical direction, and the lower frame 1 is supported on the ground at the hole mouth of the bored pile. The space through the middle part of the lower frame 1 is arranged opposite to the pile hole 7 and is connected thereto, which ensures the support stability of the lower frame without affecting the square steel column passing vertically downward from the upper part of the lower frame 1 to the inside of the pile hole 7 during construction. The steel bar positioner 2 and the upper frame are both arranged on the upper plane frame, and the steel bar positioner 2 and the upper frame do not interfere with each other. The center point of the steel bar positioner 2 on the horizontal plane and the center point of the square limit hole of the upper frame on the horizontal plane are both located on the axis of the pile hole 7, so that the axis of the steel cage 8 coincides with the mid-vertical line of the square steel column 6 after installation, ensuring the connection stability between the two. After using the steel bar positioner 2 to position the lower steel cage 8, the steel bar positioner 2 can be removed from the lower frame 1 to avoid blocking the middle through space of the lower frame and affecting the subsequent sinking construction of the square steel column. The upper frame is also a three-dimensional frame structure, and a square limit hole is provided in the middle of the upper frame. The upper frame is penetrated in the vertical direction at the square limit hole, and the square steel column 6 can pass through the upper frame in the vertical direction through the square limit hole. A square steel column limiter 4 is provided along the circumferential direction on the inner side of the square limit hole, which includes four limit strips arranged continuously, and any limit strip is fitted on the corresponding side of the square limit hole. The inner ring cross-section of the square steel column limiter 4 is the same as the cross-sectional size and shape of the square steel column 6, and can play an effective limiting role when the square steel column is inserted.

[0048] The present invention arranges the limiting guide device in layers according to the construction structure, wherein the lower frame is used to locate the relative position of the steel cage and the square steel column, and the upper frame is used to provide limiting guidance for the sinking of the other steel column. Structurally, the deviation and verticality control of the sinking of the other steel column is achieved, and the precise sinking of the square steel column can be achieved, thereby improving its stability as a vertical supporting structure and the connection accuracy with the bored piles below, and effectively ensuring the overall construction quality.

[0049] In another technical solution, the square steel column construction limiting guide device also includes a plurality of bases 5, which are arranged at intervals at the bottom of the lower frame 1, and any base 5 includes a bottom plate 51, the surface of which is provided with a plurality of vertical through holes at intervals and fixedly connected to the embedded steel bars in the ground hardened layer; a connecting block 52, which is arranged on the bottom plate 51 and fixedly connected to the bottom of the lower frame 1; a plurality of limiting plates 53, which are arranged at intervals along the circumference of the connecting block 52, and any limiting plate 53 is fixedly connected to the connecting block 52 and the bottom plate 51. The multiple bases 5 are four bases 5, which are distributed around the bottom of the lower frame 1. When installing the lower frame 1, the base 5 can be directly fixed on the ground near the pile hole 7, and then the lower frame 1 is fixed on the top of the base 5, thereby converting the connection between the bottom (plane) of the lower frame and the ground into the connection between the bottom (multi-point) of the base and the ground, which simplifies the connection relationship between the lower frame and the ground while ensuring the connection stability. The horizontality and verticality of the lower bracket can be ensured by adjusting the base 5, which is convenient for construction. The limit plate 53 is vertically arranged, and the contact surfaces of the limit plate 53, the connecting block 52 and the bottom plate 51 are in contact with each other, ensuring the connection strength between the connecting block and the bottom plate. A plurality of vertical through holes are provided on the base plate 51, and a ground hardening layer is laid on the ground around the pile hole 7, in which a steel bar structure is embedded. During installation, bolts can be inserted into the vertical through holes and locked to fix the base plate 51 and the embedded steel bar part of the ground hardening layer, thereby stably fixing the base to the ground, ensuring the installation stability of the limit guide device, and preventing the limit guide device from being unstablely connected to the ground when subjected to external impact force, resulting in problems such as tilting and deformation, which affects the construction accuracy of the square steel column.

[0050] In another technical solution, the square steel column construction limit guide device, the steel bar locator 2 includes a platform plate 21, which is horizontally arranged and erected on the top surface of the lower frame 1, and the two ends of the platform plate 21 are detachably connected to the lower frame 1; a plurality of positioning holes 22, which are arranged in the middle of the platform plate 21, and the plurality of positioning holes 22 are distributed along a circle with the center point of the platform plate 21 as the center and the radius of the steel cage 8 as the radius, and the plurality of positioning holes 22 correspond to the plurality of main bars of the steel cage 8 one by one. Among them, the steel bar locator 2 is arranged on the top surface of the lower frame 1, and the plate body of the platform plate 21 is located at the hollow position in the middle of the lower frame 1, and the two ends of the platform plate 21 extend outwards and are connected to the top surface of the lower frame 1, and the two ends of the platform plate 21 can be fixed to the lower frame 1 by bolts during installation, and the steel bar locator 2 can be conveniently moved out of the limit guide device along the side by removing the bolts. The positioning holes 22 are vertically arranged and penetrate the platform plate 21, and the positions of the multiple positioning holes 22 correspond one by one to the designed positions of the main bars of the steel cage. The centers of the multiple positioning holes 22 (i.e., the center point of the platform plate 21) are located at the axis of the pile hole 7. Therefore, when the steel bar locator 2 is installed, the main bars of the steel cage 8 below are aligned with the multiple positioning holes 22, so that the horizontal installation position of the steel cage 8 in the pile hole 7 can be positioned, and the relative positions of the steel cage 8 and the square steel column 6 are also positioned. After the steel cage 8 is positioned and temporarily fixed, the steel bar locator 2 can be removed to prevent it from affecting the connection between the square steel column and the steel cage.

[0051] In another technical solution, the square steel column construction limit guide device is provided with an installation through hole 23 on the platform plate 21, which is located on the inner side of the plurality of positioning through holes 22 and is not connected thereto. Specifically, the installation through hole 23 is centered on the center of the platform plate 21 and has a diameter smaller than the inner diameter of the steel cage 8. On the one hand, it is ensured that the positioning through hole 22 can effectively position the main reinforcement of the steel cage. On the other hand, the installation through hole 23 is located in the middle through space of the lower frame 1 and is connected thereto. When the steel bar positioner 2 is used to position the lower steel cage 8, the steel cage 8 can be hoisted and the position of the steel cage 8 in the pile hole 7 can be controlled by lowering the sling or hoist through the installation through hole 23, so as to facilitate the alignment of the main reinforcement of the steel cage 8 with the positioning through hole 22.

[0052] In another technical solution, the square steel column construction limit guide device, the upper frame includes two layers of brackets, each layer of brackets includes a plurality of columns 33, which are vertically spaced and arranged on the same plane; a plane frame 34, which is fixed to the top of the plurality of columns 33 in the horizontal direction, and the middle of the plane frame 34 is provided with the square limit hole;

[0053] The two-layer bracket includes an upper bracket 31 and a lower bracket 32 ​​, the columns 33 of the lower bracket 32 ​​are fixed on the top surface of the lower frame 1 , and the columns 33 of the upper bracket 31 are fixed on the top surface of the plane frame 34 of the lower bracket 32 ​​.

[0054] In the above technical solution, the multi-layer frame structure of the upper frame body is two layers, namely, the upper bracket 31 and the lower bracket 32. The plane frame 34 is a tic-tac-toe structure formed by the staggered connection of multiple cross bars. The square space formed by the cross bars in the middle of the plane frame 34 is the square limit hole. The shape and size of the square limit hole are determined according to the selected square steel column model. The plane frames 34 of the two-layer brackets have the same structure. A square steel column limiter 4 is provided at the square limit hole on any plane frame 34. The plane position and verticality of the square steel column 6 are limited by the combination of the two-layer bracket and the square steel column limiter 4 at the same time: on the basis of the horizontal limitation of the square steel column 6 by the single-layer bracket, by setting the two-layer bracket, the square steel column 6 has two limit points in the vertical direction, and the sinking of the square steel column is further limited and guided from the longitudinal direction, which can better prevent the square steel column from being offset during the sinking process and improve the installation accuracy of the square steel column.

[0055] In another technical solution, the above-mentioned square steel column construction limit guide device, the above-mentioned upper frame also includes a walkway plate 35, which is laid on the plane frame 34 of the above-mentioned upper bracket 31 and fills the frame gap except the above-mentioned square limit holes, and the above-mentioned walkway plate 35 and the above-mentioned plane frame 34 of the above-mentioned upper bracket 31 together constitute an upper platform. Among them, the walkway plate 35 is laid on the plane frame 34 of the upper bracket 31, so that the top surface of the upper bracket 31 forms a complete construction platform, which is convenient for the staff to sink the square steel column from above the limit guide device and perform subsequent construction. When laying the walkway plate 35, the position of the square limit holes must be avoided to prevent affecting the normal sinking construction of the square steel column.

[0056] The present invention also provides a construction method of a square steel column construction limiting guide device, comprising:

[0057] S1. Site hardening: A ground hardening layer is applied on the ground near the bored piles to strengthen the surrounding area of ​​the bored piles, ensuring that the location is flat and the foundation bearing capacity is at least 150kpa. The ground hardening layer is a cast-in-place concrete surface layer with a thickness of not less than 30cm. The steel bars in the concrete surface layer are configured to be not less than double-layer bidirectional

[0058] S2. Measurement and layout: Use a total station to measure and layout the installation positions of the square steel column and the limit guide device on the ground hardened layer, where the position of the limit guide device is specifically the position of the four bases 5 at the bottom on the ground hardened layer, and it is necessary to ensure that the position elevation difference △ of any two bases 5 is ≤1‰L (L represents the distance between the two bases);

[0059] S3, make the steel cage 8 of the bored pile as required and use the lifting equipment to lift the steel cage 8 and lower it along the completed pile hole 7. When the top of the steel cage 8 is lowered to the hole mouth near the pile hole 7, a support beam is symmetrically installed on the ground around the pile hole 7 and the steel cage 8 is suspended on the support beam. One end of the support beam is fixed on the ground and the other end extends horizontally into the cross section of the pile hole 7. The support beam suspends the top two ends of the steel cage 8 through steel wire ropes from both ends in the diameter direction of the steel cage. The steel cage is a structure in which the main reinforcement is gathered at the top, that is, the top diameter of the steel cage is smaller than the diameter of the main structure of the steel cage. The suspension point on the steel cage can be selected on the main reinforcement of the main structure of the steel cage. Therefore, in the suspended state, some segments at the top of the main reinforcement of the steel cage extend upward from the hole mouth of the pile hole 7. After the steel cage is suspended, the wire rope sling of the lifting equipment is released, and the lifting equipment is a conventional crane.

[0060] S4, four bases 5 are installed on the ground hardened layer according to the measured and placed positions of the limit guide device in S2, and the bases 5 are fixedly connected to the embedded bars of the ground hardened layer by bolts to ensure the installation accuracy and stability of the limit guide device, and the lower frame 1 is assembled on the base 5, the lower frame 1 is covered on the top outer side of the steel cage 8, and the top segment of the steel cage 8 is located in the middle through space of the lower frame 1, and the steel bar positioner 2 is installed on the lower frame 1, and the mid-vertical line of the steel bar positioner 2 coincides with the axis of the pile hole 7;

[0061] S5, reconnect the steel cage 8 to the wire rope sling of the lifting equipment and remove the support beam, control the steel cage 8 to move horizontally or rotate by the lifting equipment, so that the top ends of the multiple main bars of the steel cage 8 are aligned one by one with the multiple positioning holes 22 on the steel bar positioner 2 (the main bars are aligned with the positioning holes 22), that is, the lateral positioning of the steel bar top is completed, and the support beam is installed again, and the steel cage is vertically suspended on the support beam while keeping the lateral position of the steel cage unchanged, and then the steel bar positioner 2 is removed;

[0062] S6. Install a connecting plate 61 on the bottom outer wall of the square steel column 6. The connecting plate 61 is horizontally arranged and has a plurality of connecting through holes on the surface, which correspond to the plurality of main bars of the steel cage 8 one by one. The connecting plate 61 can pass through the middle through space of the lower frame 1 and enter the pile hole 7. When the square steel column 6 is lifted by the lifting equipment, it is first suspended symmetrically at the top of the square steel column, and the top of the square steel column is slowly lifted to 0.5m from the ground, and then the square steel column 6 is lifted to a vertical state, and the square steel column 6 is stably lifted to the top of the steel cage 8, and it is slowly lowered along the pile hole 7 to the bottom of the square steel column 6 close to the top of the steel cage 8;

[0063] S7, according to the measured and placed positions of the square steel columns in S2, the upper frame and the square steel column stopper 4 are installed on the lower frame 1, the bottom of the square steel column 6 is wrapped in the square limit hole of the upper frame, and the square steel column stopper 4 is sleeved on the outside of the square steel column 6, and the upper frame is fixedly connected to the lower frame 1;

[0064] S8, using the lifting equipment to continue to slowly lower the square steel column 6 under the limiting action of the square steel column stopper 4, so that the multiple connecting through holes on the connecting plate 61 are plugged with the multiple main bars of the steel cage 8, and during the lowering process, the corresponding connecting through holes on the main bar connecting plate 61 of the steel cage 8, when the main bar passes through the upper connecting plate 61, use bolts to lock the main bar and the connecting plate 61, and after fixing the connecting through holes with the corresponding main bars, untie the suspension connection between the support beam and the steel cage 8 and remove the support beam, that is, the square steel column 6 and the steel cage 8 are connected;

[0065] S9. Use a lifting device to lower the square steel column 6 and the steel cage 8 as a whole to the designed elevation under the limiting action of the square steel column limiter 4, then lower the guide tube to perform underwater concrete pouring on the bored piles, and remove the limiting guide device after the concrete strength meets the requirements. The limiting guide device can be moved to the next square steel column construction position and reused.

[0066] In another technical solution, the construction method of the square steel column construction limit guide device, in S6, before the square steel column is lifted, multiple marking points are set at intervals along the height direction on the outer wall of the square steel column 6, and the distance between two adjacent marking points is fixed; in S9, when the square steel column is lowered, the coordinates of the multiple marking points on the square steel column 6 are read by a total station at fixed intervals, and the verticality of the square steel column 6 is calculated according to the coordinates of the multiple marking points at different times. In the above technical solution, a marking point is set every 4m along the height direction on the outer wall of the square steel column 6, and when the square steel column is lowered, the coordinates of the marking points are read and recorded by a total station every 15min, and the overall verticality of the cast-in-place pile is evaluated according to the calculated verticality of the square steel column, and the sinking construction of the square steel column is guided. When the verticality does not meet the construction requirements, the lowering construction of the square steel column is suspended and the reasons affecting the verticality are checked. After the adjustment is completed, the square steel column construction is continued, so that the quality monitoring in the square steel column construction is realized, and the need to adjust the verticality of the square steel column after all the construction is completed is avoided, and the construction quality and construction efficiency are improved.

[0067] In another technical solution, in the construction method of the square steel column construction limit guide device, in S6, the connecting plate 61 is a plurality of ring plates arranged at intervals along the height direction of the square steel column 6, any ring plate is provided with the plurality of connecting through-holes, and the outer ends of two adjacent ring plates are fixedly connected by axillary plates. In this embodiment, two ring plates are provided at the bottom of the square steel column 6, and the plurality of connecting through-holes on the two ring plates correspond to each other. During the lowering process of the square steel column, the main bars of the steel cage 8 pass through the corresponding connecting through-holes on the two ring plates in turn. When fixing, bolts are used to lock the main bars and the corresponding ring plates in layers, so that the connection structure of the steel cage 8 and the square steel column 6 forms a three-dimensional frame, which further ensures the connection accuracy between the steel cage and the square steel column, and improves the connection strength, so that the connection between the steel cage and the square steel column is more stable.

[0068] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A construction method for a square steel column construction limiting guide device, characterized in that: include: S1. Apply a ground hardening layer on the ground near the bored piles; S2. Using a total station to measure and place the installation positions of the square steel columns and the limit guide device on the ground hardened layer; S3, using a hoisting device to hoist the steel cage of the bored pile, and lowering it along the completed pile hole, when the top of the steel cage is lowered to the hole near the pile hole, installing a support beam on the ground around the pile hole and suspending the steel cage on the support beam; S4, installing the lower frame and the steel bar positioner on the ground hardened layer according to the measured position of the limit guide device in S2; S5, reconnecting the steel cage to the hoisting equipment and removing the support beam, controlling the movement of the steel cage by the hoisting equipment, aligning the top ends of the multiple main bars of the steel cage with the multiple positioning holes on the steel bar positioner one by one, installing the support beam again, suspending the steel cage at the position where the positioning is completed, and removing the steel bar positioner; S6. Install a connecting plate on the bottom outer wall of the square steel column, wherein the connecting plate is horizontally arranged and has a plurality of connecting through holes on its surface, which correspond one to one with the plurality of main bars of the steel cage, and use a lifting device to lift the square steel column and lower it along the pile hole until the bottom of the square steel column is close to the top of the steel cage; S7, installing the upper frame and the square steel column stopper on the lower frame according to the measured and placed position of the square steel column in S2, wherein the square steel column stopper is sleeved on the outer side of the square steel column; S8, using a lifting device to continue lowering the square steel column under the limiting action of the square steel column limiter, so that the multiple connecting through holes on the connecting plate are matched and plugged with the multiple main bars of the steel cage, and after fixing the connecting through holes with the corresponding main bars, remove the support beam; S9, using a lifting device to lower the square steel column and the steel cage as a whole to the designed elevation under the limiting action of the square steel column limiter, and then pouring concrete for the bored piles, and removing the limiting guide device after the concrete strength meets the requirements; Wherein, the square steel column construction limiting guide device comprises: The lower frame is a three-dimensional frame structure fixed on the ground directly above the bored piles and the middle part is vertically penetrated; A steel bar positioner, which is horizontally arranged on the top surface of the lower frame and detachably connected thereto, the steel bar positioner is arranged to position the main reinforcement of the steel cage of the bored pile, the steel bar positioner includes a platform plate, which is horizontally arranged and erected on the top surface of the lower frame, and the two ends of the platform plate are detachably connected to the lower frame; a plurality of positioning through-holes, which are arranged in the middle of the platform plate, the plurality of positioning through-holes are distributed along a circumference with the center point of the platform plate as the center and the radius of the steel cage as the radius, and the plurality of positioning through-holes correspond one-to-one to the plurality of main reinforcements of the steel cage; The upper frame is a three-dimensional frame structure and is fixed on the top of the lower frame. A square limiting hole is provided in the middle of the upper frame and penetrates in the vertical direction; The square steel column stopper is a square ring structure continuously arranged along the circumference of the square stopper hole and fixed on the inner side wall of the square stopper hole. The square steel column is plugged with the square steel column stopper in the vertical direction, and the mid-perpendicular line of the square steel column stopper coincides with the axis of the steel cage. A plurality of bases are arranged at intervals at the bottom of the lower frame, and any base includes a bottom plate, a surface of which is provided with a plurality of vertical through holes at intervals and fixedly connected to the embedded steel bars in the ground hardening layer; a connecting block is arranged on the bottom plate and fixedly connected to the bottom of the lower frame; and a plurality of limiting plates are arranged at intervals along the circumference of the connecting block, and any limiting plate is fixedly connected to the connecting block and the bottom plate.

2. The construction method of the square steel column construction limiting guide device according to claim 1, characterized in that: In S6, before the square steel column is lifted, a plurality of marking points are set at intervals along the height direction on the outer wall of the square steel column, and the distance between two adjacent marking points is fixed; in S9, when the square steel column is lowered, the coordinates of the plurality of marking points on the square steel column are read using a total station at fixed intervals, and the verticality of the square steel column is calculated based on the coordinates of the plurality of marking points at different times.

3. The construction method of the square steel column construction limiting guide device according to claim 1, characterized in that: In S6, the connecting plates are a plurality of ring plates spaced apart in the height direction of the square steel column, any ring plate is provided with the plurality of connecting through holes, and the outer ends of two adjacent ring plates are fixedly connected by axillary plates.

4. The construction method of the square steel column construction limiting guide device according to claim 1, characterized in that: The platform plate is also provided with a mounting through-hole, which is located inside the plurality of positioning through-holes and is not connected thereto.

5. The construction method of the square steel column construction limiting guide device according to claim 1, characterized in that: The upper frame includes two layers of brackets, each layer of the brackets includes a plurality of columns, which are arranged vertically at intervals on the same plane; a plane frame, which is fixed to the top of the plurality of columns in the horizontal direction, and the middle of the plane frame is provided with the square limit hole; Wherein, the two-layer support includes an upper layer support and a lower layer support, the columns of the lower layer support are fixed on the top surface of the lower frame body, and the columns of the upper layer support are fixed on the top surface of the plane frame of the lower layer support.

6. The construction method of the square steel column construction limiting guide device according to claim 5, characterized in that: The upper frame also includes a walkway plate, which is laid on the plane frame of the upper support and fills the frame gaps except the square limiting holes. The walkway plate and the plane frame of the upper support together constitute an upper platform.

Images