Precisely-positioned, reusable and cleaning-free latticed column construction structure and construction method

Abstract

The present invention relates to the technical field of retaining and protection of foundation excavations. Disclosed are a precisely-positioned, reusable and cleaning-free latticed column construction structure and a construction method therefor, which solve the problems of positioning deviations during the existing latticed column construction process, and the difficulty in manually chiseling away over-poured concrete. The present structure comprises a latticed column, wherein the lower end of the latticed column is connected to a reinforcing cage; a protective cylinder is sleeved on the outside of the latticed column; an isolation structure is provided on the latticed column, and the isolation structure comprises an internal isolation structure and an external isolation structure which are correspondingly arranged on the inner and outer sides of the latticed column, respectively; the external isolation structure is located above the joint of the latticed column and the reinforcing cage; a bottom sealing plate is provided at the bottom of the internal isolation structure; a side sealing structure is sleeved on the outside of the latticed column above the external isolation structure; a sealing cover plate is provided at the top of the latticed column; and a positioning device is fitted between the protective cylinder and the latticed column. The construction method for the construction structure involves simple process steps, effectively reduces the difficulty and operation intensity of manually removing spoil in the latticed column during a subsequent excavation process, improves efficiency, and is economical and environmentally friendly.

Description

A precisely positioned, reusable, and clean-free lattice column construction structure and construction method Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and in particular to a precisely positioned, reusable, and cleaning-free lattice column construction structure and a construction method thereof. Background Art

[0002] In recent years, lattice columns have become an important part of the deep foundation pit support system and are increasingly appearing in the construction of tunnels, subways, and stations. The main functions of lattice columns are support, fixation, and stability. In deep foundation pit construction, lattice columns are mainly located in the center of the tunnel foundation pit. Most lattice columns are connected to column piles at the bottom. The lattice columns are firmly welded to the steel cage. The column piles are below the bottom of the foundation pit, and the lattice columns are above the bottom of the foundation pit. They can be cut off after construction is completed. As the main vertical load-bearing structure of the tunnel support structure, the lattice column is mainly to ensure the enhanced bending performance of the component under the same axial resistance conditions and save materials. The cross-section of the lattice column is generally designed as a biaxially symmetrical or uniaxially symmetrical cross-section of steel sections or steel plates.

[0003] Before construction of the column piles, the center point must be precisely located using a total station. A perpendicular cross line is set, and the intersection of the cross lines is the centerline of the column lattice column. Four control piles are placed by pulling the cross line nails to bury the casing for positioning. Drilling is then carried out, and finally, the crane is manually moved to adjust the hoisting position of the steel cage lattice column and slowly lower it. However, there may be certain errors in the positioning process, which may cause construction hazards of the support structure.

[0004] The column piles and lattice columns need to be filled with concrete. This lattice column body has a concrete layer inside its cavity. While this can enhance the overall strength and rigidity of the lattice column to a certain extent, over-pouring is inevitable during concrete pouring, which not only affects the aesthetics but also requires manpower and equipment to chisel through the concrete at the bottom plate to avoid affecting the bottom plate reinforcement binding. After the lattice column construction is completed, the lattice column holes on the upper part of the bottom plate are densely filled with soil. The soil inside the lattice column is generally cleaned by manual excavation from the bottom, which requires a lot of manual cleaning, is inefficient, and has uncontrollable costs. The lattice column will also be corroded by the soil, affecting its secondary use.

[0005] The existing Chinese patent document with the announcement number CN219430782U discloses a lattice column structure for a clean-free foundation pit, which relates to the field of lattice column clean-free technology. The structure includes a placement platform and four telescopic structures. A support structure is provided below the placement platform. The structure includes a steel lattice frame and a permeable geotextile or steel mesh wrapped around the outside of the steel lattice frame. The permeable geotextile or steel mesh is fixed to the outer surface of the steel lattice frame by multiple straps. A sealing cover is provided at the top port of the steel lattice frame. This utility model prevents backfill soil from entering the lattice column during the backfill process, effectively reducing the difficulty and work intensity of manually cleaning the slag inside the lattice column during subsequent excavation, greatly reducing the safety risks during manual soil cleaning, being economical and environmentally friendly, and improving construction efficiency. Moreover, the wrapped geotextile or steel mesh is also relatively easy to remove during the later excavation process.

[0006] While the above solution prevents backfill soil from entering the lattice columns during the backfill process, it cannot achieve accurate and rapid positioning of the lattice columns during the lowering process. Furthermore, it still cannot solve the problem of over-pouring of concrete and the need to chisel the concrete inside the lattice columns at the bottom plate. Therefore, the present invention proposes a precisely positioned, reusable, and clean-free lattice column construction structure and construction method to address the above issues. Summary of the Invention

[0007] In response to the deficiencies in the above-mentioned background technology, the present invention proposes a precisely positioned, reusable, and clean-free lattice column construction structure and a construction method thereof, which solves the problems of positioning deviation and over-pouring of concrete that is difficult to manually chisel during the existing lattice column construction process.

[0008] The technical solution of the present invention is achieved as follows: a precisely positioned, reusable, and clean-free lattice column construction structure, comprising a lattice column, the lower end of the lattice column being connected to a steel cage, a casing being provided on the outer surface of the lattice column, and an isolation structure being provided on the lattice column, the isolation structure comprising an internal isolation structure and an external isolation structure respectively provided on the inner and outer sides of the lattice column, the external isolation structure being located above the connection portion between the lattice column and the steel cage, a bottom sealing plate being provided at the bottom of the internal isolation structure, a side sealing structure being provided on the outer side of the lattice column above the external isolation structure, and a sealing cover plate being provided on the top of the lattice column; a positioning device is provided between the casing and the lattice column.

[0009] Preferably, the internal isolation structure comprises a foam plastic plate fixedly laid on the inner wall of the lattice column; and the sealing cover plate is a steel plate covering the top of the lattice column.

[0010] Preferably, a pouring port is provided on the bottom sealing plate, and a concrete alarm device is provided on the bottom sealing plate; the bottom sealing plate comprises a foam plastic plate fixed to the bottom of the internal isolation structure by structural adhesive.

[0011] Preferably, the external isolation structure includes a wooden formwork fixed to the outer side wall of the lattice column; the side sealing structure includes an impermeable geotextile wrapped around the side wall of the lattice column, and the impermeable geotextile is fixed to the outer side of the lattice column by binding with binding tape.

[0012] Preferably, the casing is provided with a plurality of steel casings at equal intervals around the circumference, and the positioning device includes a structural plate and a connecting piece. The plurality of structural plates are sequentially connected end to end to form a rectangular frame, and the adjacent structural plates are hinged at one end of the connecting piece, and the other end of the connecting piece is plugged into the steel casing to position and fix the rectangular frame.

[0013] Preferably, the connecting piece is a U-shaped piece or an N-shaped piece; and an overflow port is provided on the upper side wall of the casing.

[0014] A construction method for the above-mentioned precisely positioned, reusable, and clean-free lattice column construction structure comprises the following steps:

[0015] S1: Install the internal isolation structure, external isolation structure, bottom sealing plate, and side sealing structure on the lattice column, and weld the bottom of the lattice column to the steel cage.

[0016] S2: Locate the center point of the pile hole, bury the casing, drill and excavate, weld the hanging rod on the top of the lattice column, and use a truck crane for lifting.

[0017] S3: After the upper end of the connection between the steel cage and the lattice column is lowered to the design elevation of the hole, a positioning device for positioning the lattice column is installed between the casing and the lattice column.

[0018] S4: Use the positioning device to continue to assist the lattice column and the steel cage to be lowered to the bottom, and finally pour the concrete. After the pouring is completed, install the sealing cover plate on the top of the lattice column.

[0019] S5: After solidification is completed, the soil around the lattice column is excavated and the over-filled part is removed.

[0020] S6: Remove the lattice columns and dismantle the internal isolation structure, external isolation structure, bottom sealing plate, side sealing structure and sealing cover plate on the lattice columns in preparation for transfer.

[0021] Preferably, the specific process of step S1 is:

[0022] S1.1: First, install the internal isolation structure in the lattice column and use structural adhesive to stick the bottom sealing plate to the lower end of the concrete internal isolation structure of the lattice column.

[0023] S1.2: Wrap the impermeable geotextile around the lattice column frame. Secure the geotextile to the outer surface of the lattice column frame using multiple straps. Several straps are equidistantly placed over the geotextile outside the lattice column. Then, install a concrete alarm device below the bottom sealing plate.

[0024] S1.3: The lower portion of the lattice column frame is inserted into the reinforcement cage, and the insertion portion of the lower portion of the lattice column frame is welded to the lap joint portion of the reinforcement cage.

[0025] Preferably, the specific process of step S2 includes:

[0026] S2.1: Use a total station to accurately locate the center point of the pile hole and set mutually perpendicular cross lines. The intersection of the cross lines is the center line point of the pile hole. Pull the cross line nails according to the pile positioning point and place 4 control piles. Use the 4 control piles as a reference to control the buried position of the casing to prevent disturbance during construction.

[0027] S2.2: Bury the casing, and make sure the center line of the casing coincide with the center point of the pile position. Fill the area around the casing with clay and tamp it down to prevent water leakage. When installing the casing, use an excavator to dig and manual labor to bury it.

[0028] Preferably, the process of installing the positioning device in step S3 includes: placing the structural plate on the outside of the lattice column, using one end of the connecting piece to hinge the adjacent structural plates to form a rectangular frame to protect the lattice column, and then connecting the other end of the connecting piece with the corresponding steel casing to position and center the lattice column.

[0029] The beneficial effects of the present invention are as follows: by arranging an isolation structure on the lattice column, the circumferential side walls and the top and bottom of the lattice column can be sealed, so that the lattice column has a barrier ability, so that when over-pouring of concrete occurs, the external isolation structure can be used to prevent the concrete from flowing into the cavity of the lattice column, and the internal isolation structure can change the stress state of the concrete, reducing the difficulty of the manual chiseling step. The side sealing structure and the sealing cover plate are arranged in advance around the lattice column, which can effectively prevent the debris from entering the lattice column and avoid the need for manual cleaning in the later stage. By setting up a positioning device, the lattice column can be quickly coordinated with the casing to achieve precise positioning, and the disassembly and assembly are convenient and quick. The problems of positioning deviation in the existing lattice column construction process, the difficulty of manual chiseling of over-pouring concrete, and the difficulty of cleaning and easy rusting of the filled soil in the lattice column holes are solved. In addition, the process steps of the method are simple, which effectively reduces the difficulty and work intensity of manually cleaning the debris in the lattice column during the subsequent excavation process, improves efficiency, and is economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0031] FIG1 is a schematic diagram of the connection structure between the lattice column and the steel cage of the present invention;

[0032] FIG2 is a schematic diagram of the cross-sectional structure of a lattice column according to the present invention;

[0033] FIG3 is a schematic diagram of the connection structure of the connector of the present invention when the connector adopts an N-type member and the casing;

[0034] FIG4 is a partial schematic diagram of the connection structure between the connecting piece of the present invention and the casing when the connecting piece is a U-shaped piece.

[0035] In the figure: 1: lattice column, 2: reinforcement cage, 3: casing, 4: internal isolation structure, 5: external isolation structure, 6: bottom sealing plate, 7: side sealing structure, 8: sealing cover plate, 9: pouring mouth, 10: binding belt, 11: steel casing, 12: structural plate, 13: connecting parts. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0037] As shown in Figures 1, 2, and 3, Example 1 is a precisely positioned, reusable, and clean-free lattice column construction structure, comprising a lattice column 1, the lower end of which is connected to a steel cage 2, a casing 3 being provided on the outer shell of the lattice column 1, and an isolation structure being provided on the lattice column 1. The isolation structure comprises an internal isolation structure 4 and an external isolation structure 5 respectively provided on the inner and outer sides of the lattice column 1, the external isolation structure 5 being located above the connection portion between the lattice column 1 and the steel cage 2, and a bottom sealing plate 6 being provided at the bottom of the internal isolation structure 4. In this embodiment, a pouring port 9 is provided on the bottom sealing plate 6, and a concrete alarm device is provided on the bottom sealing plate 6. When concrete is sensed, an alarm is sounded, concrete pouring is stopped, and concrete is poured accurately to the designed elevation to avoid over-pouring of concrete. In this embodiment, the concrete alarm device can be a conventional concrete over-pouring monitoring device, a liquid level alarm, or a conventional mud level alarm, which monitors the pouring liquid level and triggers an alarm when over-pouring occurs. The lattice column 1 above the external isolation structure 5 is sheathed with a side sealing structure 7. A sealing cover plate 8 is located on top of the lattice column 1. In this embodiment, the sealing cover plate 8 is a steel plate that covers the top of the lattice column 1 to prevent debris from falling into the lattice column after pouring. A positioning device is provided between the casing 3 and the lattice column 1 to facilitate the installation and lowering of the lattice column.

[0038] As a further optional embodiment, the internal isolation structure 4 includes a foam plastic board fixedly laid on the inner wall of the lattice column 1. When the concrete is over-poured, the concrete inside the lattice column is in a three-dimensional stress state, which makes it difficult to chisel manually. The foam plastic is provided on the inner wall of the lattice column to separate the concrete from the lattice column, changing the stress state of the concrete to make it in a unidirectional stress state. The foam plastic board has a certain compressibility, which reduces the difficulty of the manual chiseling step. The bottom sealing plate 6 includes a foam plastic board fixed to the bottom of the internal isolation structure 4 by structural adhesive. The size of the bottom sealing plate is consistent with the size of the internal cavity of the lattice column. A concrete pouring port 9 is reserved in the middle of the bottom sealing plate. The pouring port aperture needs to be slightly larger than the diameter of the concrete pouring conduit so that the concrete pouring conduit can pass through the pouring port 9 to pour concrete into the hole drilled downward. Specifically, the foam plastic board in this embodiment is a polymethacrylimide foam plastic board. The polymethacrylimide foam plastic board is a lightweight, closed-cell rigid foam plastic with good mechanical properties, which meets the usage scenario requirements of this embodiment.

[0039] At the same time, as a further advantage of this embodiment, even if debris occasionally falls or water seeps into the lattice column, the internal isolation structure can still play a role, further preventing the lattice column from being filled up, resulting in difficulty in cleaning the debris and rusting the lattice column.

[0040] As a further optional embodiment, the external isolation structure 5 includes a wooden formwork fixed on the outer wall of the lattice column 1. The wooden formwork is tightly fixed and wrapped around the outer wall of the lattice column. The wooden formwork can prevent over-poured concrete from flowing into the interior of the lattice column cavity from the lattice column opening.

[0041] As a further optional embodiment, the side sealing structure 7 includes an impermeable geotextile wrapped around the side wall of the lattice column 1. The impermeable geotextile is tied and fixed to the outside of the lattice column 1 by a strapping belt 10, which can prevent backfill soil from entering the lattice column skeleton, solve the problem of later cleaning of the debris inside the lattice column and the problem of the lattice column being corroded by the soil and affecting the secondary utilization, improves the construction efficiency, and the wrapped impermeable geotextile is easier to remove during the later excavation.

[0042] The construction method of the above-mentioned precise positioning, reusable and cleaning-free lattice column construction structure comprises the following steps:

[0043] S1: Install the internal isolation structure 4, the external isolation structure 5, the bottom sealing plate 6, and the side sealing structure 7 on the lattice column 1, and weld the bottom of the lattice column 1 to the steel cage 2.

[0044] S1.1: First, install the internal isolation structure 4 in the lattice column 1, and use structural adhesive to stick the bottom sealing plate 6 to the lower end of the lattice column concrete internal isolation structure.

[0045] S1.2: Wrap the impermeable geotextile around the lattice column frame. Secure the geotextile to the outer surface of the lattice column frame using multiple rubber straps. The straps should be spaced evenly over the geotextile outside the lattice column. Install a concrete alarm device below the bottom sealing plate.

[0046] S1.3: The lower portion of the lattice column frame is inserted into the reinforcement cage of the column pile. The lower insertion portion of the lattice column frame is welded to the overlapping portion of the reinforcement cage. Specifically, each side of the lattice column is securely welded to two main reinforcement bars. Welding is performed on both sides, with a weld length of ≥5d. At the junction of the top of the reinforcement cage and the lattice column, three long steel bars are welded diagonally to the longitudinal reinforcement of the reinforcement cage on each side of the lattice column. The steel bars are of a certain length to form a flexible connection, allowing for relatively small adjustments of the lattice column.

[0047] Hanger bars are welded to the four corners of the lattice column. The length of the hanger bars is determined by the designed lattice column top elevation. The hanger bars are used to lower the lattice column and reinforcement cage to the designed height and to adjust the verticality of the lattice column top.

[0048] S2: Locate the center point of the pile hole, bury the casing 3, drill and excavate, weld the hanging rod 14 on the top of the lattice column 1, and use a truck crane to lift it after the drill rig drills into the hole.

[0049] S2.1: Use a total station to accurately locate the center point of the pile hole and set mutually perpendicular cross lines. The intersection of the cross lines is the center line point of the pile hole. Pull the cross line nails according to the pile positioning point and place 4 control piles. Use the 4 control piles as a reference to control the buried position of the casing to prevent disturbance during construction.

[0050] S2.2: Install casing. This serves to secure the pile hole, protect the hole opening, prevent surface water inflow, increase hole pressure, and guide the drilling rig. Ensure the centerline of the casing aligns with the center of the pile. Fill the casing with clay and tamp it firmly to prevent leakage. During installation, excavation with an excavator and manual labor are used.

[0051] Specifically, in this embodiment, the casing is made of steel plate, is 4 meters high, and has an inner diameter that is 200 mm larger than the diameter of the drill bit. A grouting port 14 is provided on the upper sidewall of the casing, and it is buried 0.3 meters above the ground. The casing is accurately buried, with the center line inside the casing coinciding with the center point of the pile position, the plane error is controlled within 50 mm, the vertical line inclination is no more than 1%, and the water level inside the casing is kept stable and at least 1 meter above the water level outside the hole. Before and after the casing is pressed in, the vertical position of the casing is adjusted using a precise level against the casing. The top of the casing is generally at least 0.3 meters above the ground to facilitate drill bit positioning and protect the pile hole.

[0052] S3: After the steel cage lattice column is lowered by a truck crane and the upper end of the welded connection between the steel cage 2 and the lattice column 1 is lowered to the designed elevation of the orifice, a positioning device for positioning the lattice column 1 is installed between the casing 3 and the lattice column 1. During installation of the positioning device, the structural plates 12 are positioned outside the lattice column. One end of the connector 13 is used to hinge the adjacent structural plates 12 together to form a rectangular frame to enclose the lattice column. The other end of the connector 13 is then inserted into the corresponding steel casing 11 to position and center the lattice column.

[0053] S4: Using the guiding and positioning function of the positioning device to continue to assist the lattice column 1 and the steel cage 2 to be lowered to the bottom, and finally pouring concrete. After pouring is completed, a sealing cover plate 8 is installed at the top end of the lattice column 1.

[0054] S5: After solidification is completed, the soil around the lattice column 1 is excavated and the over-filled part is removed.

[0055] S6: Remove the lattice column 1 and dismantle the internal isolation structure 4, external isolation structure 5, bottom sealing plate 6, side sealing structure 7, and sealing cover plate 8 on the lattice column 1 in preparation for transfer use.

[0056] Example 2, based on Example 1, has several steel casings 11 equidistantly spaced around the casing 3. The positioning device includes structural plates 12 and connectors 13. The structural plates are sequentially connected end-to-end to form a rectangular frame. Adjacent structural plates 12 are hinged at one end of the connectors 13, and the other end of the connectors 13 engages with the steel casings 11 to position and secure the rectangular frame. As shown in Figures 3 and 4, the connectors 13 are U-shaped or N-shaped, with their ends arranged parallel to each other. They also provide support for the entire positioning device during connection.

[0057] This embodiment uses N-shaped parts for connection. After the top of the steel cage and the lattice column are welded and lowered to the designed elevation of the hole, the lattice column positioning device is installed inside the casing and outside the lattice column. The structural plate is made of steel plate, and the positioning device is assembled into a square frame by four structural plates 12. The structural plates are connected to each other by a part of the N-shaped part. Furthermore, one end of the structural plate 12 is a concave portion, and the other end is a convex portion. The concave portion and the convex portion are both reserved with pin holes. The convex portion is inserted into the concave portion, and one end of the N-shaped part is plugged into the pin hole to fix it, so that the positioning device can be quickly installed and disassembled. When a U-shaped part is used for connection, the end of the U-shaped part is locked by a nut to prevent it from falling off.

[0058] A cross control line perpendicular to each other is defined on the casing. This line locates the connection points of the four steel casings 11, controlling the vertical and horizontal adjustments of the four steel casings 11. After adjustment, the steel casings 11 are welded to the inner or outer wall of the casing. The two parallel ends of the connector are respectively plugged into the steel casings and the pin holes, positioning the distance from the four corners of the rectangular frame to the steel casing. This facilitates the positioning and centering of the lattice column through the inner wall of the rectangular frame. The connector connection method is also set to facilitate on-site assembly of the positioning device and rapid lifting and removal.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A precisely positioned, reusable, and clean-free lattice column construction structure, comprising a lattice column (1), wherein the lower end of the lattice column (1) is connected to a steel cage (2), a casing (3) is provided on the outer shell of the lattice column (1), and an isolation structure is provided on the lattice column (1), characterized in that: The isolation structure comprises an internal isolation structure (4) and an external isolation structure (5) respectively arranged on the inner and outer sides of the lattice column (1); the external isolation structure (5) is located above the connection portion between the lattice column (1) and the steel cage (2); a bottom sealing plate (6) is provided at the bottom of the internal isolation structure (4); a side sealing structure (7) is provided on the outer side of the lattice column (1) above the external isolation structure (5); and a sealing cover plate (8) is provided at the top of the lattice column (1); and a positioning device is provided between the casing (3) and the lattice column (1).

2. The precisely positioned, reusable, and clean-free lattice column construction structure according to claim 1 is characterized in that: The internal isolation structure (4) comprises a foam plastic plate fixedly laid on the inner wall of the lattice column (1); and the sealing cover plate (8) is a steel plate covering the top of the lattice column (1).

3. The precisely positioned, reusable, and clean-free lattice column construction structure according to claim 2 is characterized in that: The bottom sealing plate (6) is provided with a pouring port (9), and the bottom sealing plate (6) is provided with a concrete alarm device; the bottom sealing plate (6) comprises a foam plastic plate fixed to the bottom of the internal isolation structure (4) by means of structural adhesive.

4. The precisely positioned, reusable, and clean-free lattice column construction structure according to claim 3 is characterized by: The external isolation structure (5) includes a wooden formwork fixed to the outer side wall of the lattice column (1); the side sealing structure (7) includes a water-impermeable geotextile wrapped around the side wall of the lattice column (1), and the water-impermeable geotextile is tied and fixed to the outer side of the lattice column (1) by a tying belt (10).

5. The precisely positioned, reusable, and clean-free lattice column construction structure according to any one of claims 1 to 4, characterized in that: The casing (3) is provided with a plurality of steel casings (11) at equal intervals in the circumferential direction. The positioning device comprises a structural plate (12) and a connecting piece (13). The plurality of structural plates are sequentially connected end to end to form a rectangular frame. Adjacent structural plates (12) are hinged at one end of the connecting piece (13), and the other end of the connecting piece (13) is plugged into and fitted with the steel casing (11) to position and fix the rectangular frame.

6. The precisely positioned, reusable, and clean-free lattice column construction structure according to claim 5 is characterized in that: The connecting piece (13) is a U-shaped piece or an N-shaped piece; and an overflow port (14) is provided on the upper side wall of the casing (3).

7. A construction method for the precisely positioned, reusable, and clean-free lattice column construction structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Installing an internal isolation structure (4), an external isolation structure (5), a bottom sealing plate (6), and a side sealing structure (7) on the lattice column (1), and welding the bottom of the lattice column (1) to the steel cage (2); S2: Locate the center point of the pile hole, bury the casing (3), drill and excavate, weld the hanging rod (14) on the top of the lattice column (1), and use a truck crane for lifting; S3: After the upper end of the connection portion between the steel cage (2) and the lattice column (1) is lowered to the design elevation of the hole, a positioning device for positioning the lattice column (1) is installed between the casing (3) and the lattice column (1); S4: Using the positioning device to continue to assist the lattice column (1) and the steel cage (2) to be lowered to the bottom, and finally pouring concrete. After the pouring is completed, a sealing cover plate (8) is installed on the top of the lattice column (1); S5: After solidification is completed, the soil around the lattice column (1) is excavated and the overfilled part is removed; S6: Remove the lattice column (1), and dismantle the internal isolation structure (4), external isolation structure (5), bottom sealing plate (6), side sealing structure (7), and sealing cover plate (8) on the lattice column (1) in preparation for transfer use.

8. The construction method of the precisely positioned, reusable, and clean-free lattice column construction structure according to claim 7, characterized in that: The specific process of step S1 is: S1.1: First, install the internal isolation structure (4) in the lattice column (1), and use structural adhesive to stick the bottom sealing plate (6) to the lower end of the concrete internal isolation structure (4) of the lattice column (1); S1.2: Wrap the impermeable geotextile around the lattice column (1) frame, and fix the impermeable geotextile to the outer surface of the lattice column (1) frame through a plurality of strapping bands (10), and a plurality of strapping bands (10) are equidistantly mounted on the impermeable geotextile outside the lattice column (1); then install a concrete alarm device under the bottom sealing plate (6); S1.3: The lower portion of the lattice column (1) frame is inserted into the steel cage (2), and the insertion portion of the lower portion of the lattice column (1) frame and the overlap portion of the steel cage (2) are welded and overlapped.

9. The construction method of the precisely positioned, reusable, and clean-free lattice column construction structure according to claim 8, characterized in that: The specific process of step S2 includes: S2.1: Use a total station to accurately locate the center point of the pile hole and set mutually perpendicular crosshairs. The intersection of the crosshairs is the centerline of the pile hole. Pull the crosshairs and place four control piles according to the pile positioning point. Use the four control piles as a reference to control the buried position of the casing to prevent disturbance during construction. S2.2: Bury the casing, and make sure the center line of the casing coincide with the center point of the pile position. Fill the area around the casing with clay and tamp it down to prevent water leakage. When installing the casing, use an excavator to dig and manual labor to bury it.

10. The construction method of the precisely positioned, reusable, and clean-free lattice column construction structure according to any one of claims 7 to 9, characterized in that: The process of installing the positioning device in step S3 includes: The structural plate (12) is arranged outside the lattice column, and one end of the connecting member (13) is used to hinge the adjacent structural plates (12) to form a rectangular frame to protect the lattice column. Subsequently, the other end of the connecting member (13) is plugged into the corresponding steel casing (11) to position and center the lattice column.

Images