Quickly-assembled and quickly-disassembled diversified combined type protective fence for building construction

Abstract

The utility model provides a quickly-assembled and quickly-disassembled diversified combined type protective fence for building construction, which is suitable for a building construction site. The fence is composed of stand columns, a top cross arm, a middle transverse plate, a bottom transverse plate and vertical rods, modular design is adopted for all the assemblies, and independent production and transportation are facilitated. N-shaped clamping groove-shaped first opposite-inserting fasteners are arranged on the stand columns, second opposite-inserting fasteners which extend downwards and are of a hanging lug structure are arranged at the ends of the top cross arm, the middle transverse plate and the bottom transverse plate, and the first opposite-inserting fasteners and the second opposite-inserting fasteners are matched with each other, so that rapid mounting and dismounting are achieved. The top cross arm, the middle transverse plate and the bottom transverse plate are all provided with preset insertion holes used for insertion of the vertical rods, and it is ensured that the vertical rods are accurately aligned and fixed. According to the design, the efficiency and convenience of mounting and dismounting are improved, the flexibility and practicability of the fence are enhanced, and the shape and the direction can be adjusted according to actual needs. All the components are made of light and durable materials, such as aluminum alloy plates, so that the strength and durability of the structure are ensured.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary facilities and equipment used in building construction environments, specifically a quick-installation and quick-disassembly diversified combination protective fence for building construction. Background Technology

[0002] Fences used at construction sites are temporary safety facilities primarily used to isolate the construction site from the outside world to protect the safety of construction workers, equipment, and the public. First, the specific area requiring enclosure needs to be defined based on the construction plan and actual site conditions. Depending on the construction environment (e.g., beside roads, near residential areas) and requirements (e.g., safety requirements, aesthetic considerations), suitable fence materials and designs are selected, such as wooden, iron, or plastic fences. They are commonly used in road renovation and expansion projects to prevent unauthorized personnel from entering the work area while guiding traffic flow. They are also used as isolation measures during power line erection and maintenance, or when using large equipment such as tower cranes, to ensure construction safety.

[0003] Currently, the use of fencing at construction sites does present some inconveniences, such as:

[0004] Large Components: Many fencing systems consist of multiple large components, which are typically heavy and bulky, requiring significant manpower and machinery for handling and transportation. Installing such fencing usually requires multiple workers working together, which not only increases labor costs but can also delay construction due to poor coordination. The installation process may require the use of auxiliary equipment such as cranes and forklifts, further increasing the complexity and cost of installation. Disassembly of the fencing also requires considerable manpower and time, especially after prolonged use, as connectors may rust or become damaged, increasing the difficulty of disassembly.

[0005] Fixed dimensions and specifications: Fences typically need to be pre-designed based on the specific conditions of the construction site, including dimensions and shape. While this customized design can meet specific needs, it also leads to higher preparation time and costs. Once the fence is installed, if the site conditions change (such as terrain changes or adjustments to the construction area), the original fence may not be suitable for the new requirements, necessitating redesign and reinstallation, resulting in wasted resources. It also lacks flexibility in turning and combining into various shapes. These problems make current fences inconvenient to use and costly. Summary of the Invention

[0006] To address the shortcomings and defects of the existing technology, the inventors have developed and improved a modular fence design, a lightweight material fence, and a quick-installation structure. These improvements aim to increase installation efficiency, reduce costs, and enhance flexibility. Specifically, this utility model is implemented as follows:

[0007] A quick-assembly and quick-disassembly modular protective fence for construction includes: several upright posts placed on the ground; a first pair of snap fasteners located on at least two different facing surfaces at the top, middle, and bottom of each post, for connecting with a second pair of snap fasteners after being fitted together; a top crossbar with several pre-set holes for horizontal installation on the top of the uprights to fix the uprights, and having a second pair of snap fasteners at both ends that are adapted to the first pair of snap fasteners, respectively, for connecting with the posts on their respective sides; and a middle crossbar with several pre-set holes, and having a second pair of snap fasteners at both ends that are adapted to the first pair of snap fasteners. A second pair of snap fasteners, adapted to the first pair of snap fasteners, are respectively connected to the uprights on one side for installation; used for horizontal insertion into the middle of the vertical pole; the bottom horizontal plate has several pre-set insertion holes, and both ends have a second pair of snap fasteners adapted to the first pair of snap fasteners, respectively connected to the uprights on one side for installation; used for insertion of the bottom of the vertical pole; there are several vertical poles, and their upper, middle and lower parts are respectively inserted into the top crossbeam, the middle horizontal plate and the bottom horizontal plate; the uprights, vertical poles, top crossbeam, middle horizontal plate and bottom horizontal plate together constitute the guardrail, and multiple sets of guardrails are combined to form a closed and connected fence.

[0008] Furthermore, the top crossbeam, the middle crossbeam, and the bottom crossbeam are all integrally pressed sheet metal, with a top and bottom surface of equal thickness and a side surface. The bottom and top surfaces of the middle crossbeam are provided with preset insertion holes; the bottom surface of the top crossbeam and the top surface of the bottom crossbeam are provided with the preset insertion holes.

[0009] Furthermore, two second pairs of fasteners are provided on both ends of the middle and bottom horizontal plates, and one second pair of fasteners is provided on the end of the top crossbeam; two first pairs of fasteners are provided at the bottom and middle of the column, and one first pair of fasteners is provided at the top.

[0010] Furthermore, the first pair of fasteners are n-shaped slot-like structures welded to the side wall of the column; the second pair of fasteners are downwardly extending lug structures, which are welded to the side walls of the top crossbeam, the middle crossbeam, and the bottom crossbeam, and the lug structures have gaps from the side walls. The size of the lug structures is adapted to the opening size of the n-shaped slot-like structures, and can be fastened into the n-shaped slot-like structures; the gap is not less than the thickness of the n-shaped slot-like structures.

[0011] Furthermore, several drainage holes are provided on the bottom surface of the top crossbeam, the middle crossbeam, and the bottom crossbeam. The column is a square tube or a round tube, and the shape and size of the preset insertion hole are adapted to the cross-sectional shape and size of the column.

[0012] Furthermore, when the column is used as a corner column, the first pair of fasteners on its column surface are arranged at right angles on two adjacent column surfaces.

[0013] Furthermore, the n-shaped slot structure of the first pair of fasteners is a square structure, and the hanging ear structure of the second pair of fasteners is also a correspondingly adapted square, allowing for insertion and fastening installation from three side directions.

[0014] Furthermore, it also includes one side of the column with a hinge installed at the top, middle and bottom, and the other side of the hinge installed on the side wall of a set of top crossbeams, middle crossbeams and bottom crossbeams. The other side wall is not equipped with fasteners. This set of top crossbeams, middle crossbeams and bottom crossbeams constitutes an independent gate, and a lock is installed on the gate to enter and exit the fence.

[0015] Furthermore, each of the columns is provided with a base fixing plate at its bottom end, and the base fixing plate is provided with several fixing holes, through which the fence body can be installed and fixed by inserting ground bolts.

[0016] Another aspect of this utility model provides a method for assembling and disassembling the above-mentioned quick-installation and quick-disassembly diversified combination protective fence, which includes the following steps:

[0017] Quick Installation: Step S1: After erecting the two posts, take out a set of top crossbeams, middle crossbeams, and bottom crossbeams. Attach the second pair of fasteners at both ends of the bottom and middle crossbeams to the first pair of fasteners between the two posts. Step S2: According to the pre-set length and width dimensions of this fence and the desired shape and orientation, connect the bottom crossbeam, middle crossbeam, and posts to form the desired shape and area. Step S3: Align each vertical bar with the pre-set holes on the top surface of the middle crossbeam and insert them sequentially until they are inserted into the corresponding pre-set holes on the bottom crossbeam. Step S4: Insert each top crossbeam through the top of the vertical bar and attach the second pair of fasteners to the first pair of fasteners to complete the fixation. Step S5: Install the gate structure separately in the area where a gate is needed.

[0018] Quick disassembly: Step S1': Pull all the top crossbeams upwards from the top of the vertical poles, disassemble them, stack them together, count them, and then tie them up; Step S2': Pull all the vertical poles upwards, disassemble them, stack them together, count them, and then tie them up; Step S3': Pull all the bottom crossbeams and middle crossbeams out from between the second pair of interlocking fasteners and the first pair of interlocking fasteners between the columns, disassemble them, stack them together, count them, and then tie them up; Step S4': Remove the ground bolts at the bottom of the columns, stack them together, count them, and then tie them up.

[0019] The working principle of this utility model: In this utility model, the quick-installation and quick-disassembly modular protective fence adopts a modular design, decomposing the fence into multiple standardized components, including posts, top crossarms, middle crossarms, bottom crossarms, and vertical poles. This design allows each component to be produced and transported independently, greatly simplifying the installation and disassembly process. The various components of the fence can be formed using metals such as aluminum alloy sheets, with the posts and vertical poles having a hollow structure. These materials are not only lightweight but also possess sufficient strength and durability to meet the safety requirements of construction sites. The structural design achieves rapid installation and disassembly. The first pair of snap fasteners is located at the top, middle, and bottom of the posts, forming an n-shaped slot structure; the second pair of snap fasteners is located at the ends of the top crossarm, middle crossarm, and bottom crossarm; they are mutually compatible in size and shape, using downward-extending hook structures inserted into the slots. This design allows other components to be quickly inserted and fixed via the hook structures without the need for bolts or screws; the top crossarm, middle crossarm, and bottom crossarm are all provided with pre-set insertion holes for inserting vertical poles. This design ensures accurate alignment of the uprights during installation and allows for easy fixation via simple insertion. The installed uprights also serve to secure the top, middle, and bottom crossbeams. For enhanced practicality, hinges are installed on one side of the uprights at the top, middle, and bottom, while the other side is mounted on the side wall of the top, middle, and bottom crossbeams. This design allows the assembly to function as a gate, facilitating easy access to the fenced area. The fastener design utilizes a square structure, allowing for interlocking installation from three sides. This design facilitates flexible repositioning when needed without requiring separate repositioning uprights. Using a single upright structure allows the fence to be flexibly adjusted in shape and direction to meet specific needs, significantly improving practicality and ease of use.

[0020] The beneficial technical effects of this utility model compared with the prior art are:

[0021] (1) Advantages of modular design: The fence is broken down into standardized components such as posts, top crossbeams, middle crossbeams, bottom crossbeams, and vertical bars. Each component can be produced and transported independently, and due to their consistent specifications, they are easy to bundle and pack, simplifying logistics and storage processes and reducing costs. The standardized components and snap-fit ​​design make installation and disassembly simpler and faster, eliminating the need for bolts or screws, significantly reducing installation time and labor costs, and fully demonstrating the advantages of modular design. The modular design simplifies disassembly; all components can be stacked, counted, and bundled for easy management and reuse. The simple and quick installation and disassembly process reduces labor and time costs, while the durability and reusability of the materials also lower the overall cost over the long term.

[0022] (2) Lightweight and stable structure: The structure is made of metal such as aluminum alloy sheet, which is pressed and formed, and the columns and vertical rods are hollow structures. These materials are not only lightweight, making them easy to transport, assemble and disassemble, but also have sufficient strength and durability to meet the safety requirements of the construction site.

[0023] (3) High flexibility and practicality: The design of the first and second pairs of interlocking fasteners allows for insertion and fastening from three sides, enabling the fence to be flexibly adjusted in shape and direction according to actual needs under a single specification of post and horizontal plate structure, adapting to different construction site requirements and improving the flexibility and practicality during installation and combination. Hinges can be installed on one side of the post at the top, middle, and bottom, and the other side can be installed on the side wall of a set of top crossbeams, middle horizontal plates, and bottom horizontal plates to form a gate, facilitating entry and exit from the fenced area. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural view of the quick-installation and quick-disassembly modular protective fence of this utility model;

[0025] Figure 2 This is a perspective view of the column structure of this utility model. The left side is the column structure adapted to the door body, the middle side is the standard column structure, and the right side is the corner column structure.

[0026] Figure 3 This is a structural diagram of the top crossbeam, middle crossbeam, and bottom crossbeam of this utility model;

[0027] Figure 4 This is a schematic diagram of the installation structure of the quick-installation and quick-disassembly diversified combination protective fence of this utility model;

[0028] Figure 5 This is a schematic diagram showing the installation of the door body of this utility model connected to the column via hinges;

[0029] Figure 6 This is a schematic diagram of the structure for installing a lock body on a door according to this utility model;

[0030] Figure 7 This is a schematic diagram illustrating the usage of the quick-installation and quick-disassembly versatile modular protective fence of this utility model.

[0031] Figure 8 This is a schematic diagram illustrating how the modular products of this utility model can be easily stored or transported before installation or after disassembly.

[0032] Figure 9 This is a schematic diagram of the fitting and installation of the first and second interlocking fasteners in Example 2;

[0033] Figure 10This is a schematic diagram illustrating the installation effect of achieving swivel mounting even using standard columns;

[0034] in:

[0035] 1—Column, 11—First pair of interlocking fasteners, 12—Base fixing plate, 13—Fixing holes;

[0036] 20—Top crossbeam, 21—Middle crossbeam, 22—Bottom crossbeam, 23—Second pair of interlocking fasteners;

[0037] 3—Vertical rod, 30—Preset insertion hole;

[0038] 40—Hinge; 41—Lock body;

[0039] 51—Gate body. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0041] Example 1: Installation and usage steps of quick-installation and quick-disassembly modular protective fence:

[0042] I. Preparatory Work

[0043] Material preparation: Ensure that all components, including uprights 1, top crossbeams 20, middle crossbeams 21, bottom crossbeams 22, vertical bars 3, hinges 40, lock bodies 41, and base fixing plates 12, are complete and check for any damage.

[0044] Tool preparation: Prepare the necessary tools, such as ground bolts, wrenches, measuring tools, etc.

[0045] Site clearing: Clear the construction site to ensure the ground is flat and free of obstacles.

[0046] II. Installation Steps

[0047] Step 1: Positioning of column 1

[0048] Determine the location of the fence: Based on the site requirements and the preset length and width dimensions, determine the location and shape of the fence.

[0049] Placement of Post 1: Erect Post 1 in the designated position and use measuring tools to ensure that the spacing between Post 1 matches the actual length of other accessories. Typically, the distance between Post 1 is approximately 2 meters. That is, the top crossbeam 20, the middle crossbeam 21, and the bottom crossbeam 22 are also approximately 2 meters in length.

[0050] Step 2: Install the bottom horizontal plate 22

[0051] Remove the bottom cross plate 22: Remove one or all of the bottom cross plates 22 from the pile of materials on which the bottom cross plates 22 are placed.

[0052] Align the fasteners: Align the second pair of fasteners 23 (hanging ear structure) at both ends of the bottom horizontal plate 22 with the first pair of fasteners 11 (n-type slot structure) located at the bottom between the two uprights 1.

[0053] Insert and snap: Apply downward force to insert the hanging lugs into the n-shaped slots, ensuring a tight fit. Repeat this step to install all the bottom horizontal panels 22 in sequence, forming the basic frame of the fence. Alternatively, install one bottom horizontal panel 22 first, and then immediately install the middle horizontal panel 21 above it.

[0054] Step 3: Install the middle horizontal plate 21

[0055] Remove the middle cross plate 21: Remove one or all of the middle cross plates 21 from the material pile.

[0056] Align the fasteners: Align the second pair of fasteners 23 at both ends of the middle horizontal plate 21 with the first pair of fasteners 11 (n-type slot structure) located in the middle between the two columns 1.

[0057] Insert and snap: Apply downward force to insert the hanging lugs into the n-shaped slots, ensuring a tight fit. Repeat this step to install all the central horizontal panels 21 in sequence, forming the central support structure of the fence.

[0058] Step 4: Install vertical rod 3

[0059] Remove vertical rod 3: Remove several or all of the vertical rods 3 from the material pile for later use.

[0060] Align the socket: Pick up a vertical rod 3 and align the bottom end of the vertical rod 3 with the preset socket 30 on the top surface of the middle horizontal plate 21.

[0061] Insert vertical rod 3: Insert vertical rod 3 downwards into the insertion hole of the middle horizontal plate 21 until it passes through the corresponding preset insertion hole 30 of the bottom horizontal plate 22. Ensure that vertical rod 3 is vertical and stable.

[0062] Repeated installation: Insert all vertical bars 3 in sequence, from one post 1 to the other post 1, to form the longitudinal support structure of the fence.

[0063] Step 5: Install the top crossbeam 20

[0064] Remove the top crossarm 20: Remove one top crossarm 20 from the material pile.

[0065] Align the fasteners: Align the second pair of fasteners 23 (hanging ear structure) at both ends of the top crossbeam 20 with the first pair of fasteners 11n-type slot structure at the top between the two columns 1, and align the preset insertion holes 30 on the bottom surface of the top crossbeam 20 with the top of each vertical rod 3.

[0066] Insert and snap: Insert the lug structure into the n-shaped slot, ensuring a tight fit. Simultaneously, thread each pre-set insertion hole 30 on the bottom surface of the top crossarm 20 into the top of the vertical bar 3. Repeat this step to install all the top crossarms 20 in sequence, forming the top structure of the fence.

[0067] Step 6: Install door 51

[0068] Select the location of gate 51: Select the installation location of gate 51 in a suitable location on the fence as needed.

[0069] Install hinges 40: Install one hinge 40 on one side of each of the top, middle, and bottom of the two uprights 1 at the selected locations, and install the other side on the side wall of a set of top crossbeams 20, middle crossbeams 21, and bottom crossbeams 22. If necessary, the uprights 1 serving as the door body 51 may not be equipped with the first pair of interlocking fasteners 11, and may be manufactured, equipped, or reserved as special parts.

[0070] Install lock body 41: Install lock body 41 on door body 51 to ensure that door body 51 can be closed safely.

[0071] Fixed column 1: Several fixing holes 13 are provided on the base fixing plate 12 at the bottom of column 1. The column 1 is fixed to the ground by inserting ground bolts into the fixing holes 13. Ensure that column 1 is stable and does not shake.

[0072] III. Inspection and Adjustment

[0073] 1. Check the connections: Check that all fasteners and sockets are secure and that there are no loose or detached parts.

[0074] 2. Adjust position: If necessary, adjust the position of post 1 to ensure the straightness and flatness of the entire fence.

[0075] 3. Clean up the site: Clean up the construction site to ensure that no tools or materials are left behind.

[0076] 4. Use and Maintenance

[0077] Routine inspection: Regularly inspect the connecting parts of the fence to ensure they are in good condition.

[0078] Cleaning and maintenance: Clean the fence surface regularly to prevent corrosion and dirt buildup.

[0079] Timely maintenance: If any damage or looseness is found, repair or replace it promptly.

[0080] Example 2:

[0081] Installation method of connecting fasteners at corners

[0082] In this embodiment 1, when the column 1 is used as a corner column 1, the first pair of snap fasteners 11 on its column surface are arranged at right angles on two adjacent column surfaces. At this time, this type of column 1 is a special part that needs to be specially marked, stored, and easily found when in use.

[0083] Preferably, all columns 1 are standard parts, and the first pair of snap fasteners 11 on them are arranged on the front and back sides, which can be used for splicing and assembling in a straight line along the same plane, or as columns 1 at corners. In this case, the n-shaped slot structure of the first pair of snap fasteners 11 is a square structure, and the hanging ear structure of the second pair of snap fasteners 23 is also a correspondingly adapted square, which can be inserted and fastened from three side directions. During installation, the hoisting direction is sufficient.

[0084] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A quick-assembly and quick-disassembly modular protective fence for construction, characterized in that... Including: Columns (1) consist of several upright columns placed on the ground. The first pair of snap fasteners (11) are installed on at least two different facing surfaces at the top, middle and bottom of each post (1), for connecting with each other after being adapted and fastened to the second pair of snap fasteners (23). The top crossbeam (20) is provided with several preset insertion holes (30) for horizontal installation on the top of the vertical rod (3) to fix the vertical rod (3), and has second insertion fasteners (23) at both ends that are compatible with the first insertion fastener (11), which are respectively connected to the column (1) on one side for installation. The middle horizontal plate (21) is provided with several preset insertion holes (30), and the two ends have second insertion fasteners (23) that are adapted to the first insertion fastener (11), which are respectively connected to the column (1) on one side for installation; used for horizontal insertion installation in the middle of the vertical rod (3); The bottom horizontal plate (22) is provided with several preset insertion holes (30), and the two ends have second insertion fasteners (23) that are adapted to the first insertion fastener (11), which are respectively connected to the uprights (1) on their respective sides for installation; for the bottom of the vertical rod (3) to be inserted; The vertical rods (3) consist of several pieces, and their upper, middle and lower parts are respectively inserted into the top crossbeam (20), the middle crossbeam (21) and the bottom crossbeam (22); The posts (1), vertical bars (3), top crossbeams (20), middle crossbeams (21), and bottom crossbeams (22) together form a guardrail, and multiple sets of guardrails are combined to form a closed and connected fence.

2. The quick-installation and quick-disassembly modular protective fence according to claim 1, characterized in that, The top crossbeam (20), the middle crossbeam (21), and the bottom crossbeam (22) are all integrally pressed sheet metal, with a top and bottom surface of equal thickness and a side surface. The bottom and top surfaces of the middle crossbeam (21) are provided with preset insertion holes (30); the bottom surface of the top crossbeam (20) and the top surface of the bottom crossbeam are provided with the preset insertion holes (30).

3. The quick-installation and quick-disassembly modular protective fence according to claim 1, characterized in that, The middle horizontal plate (21) and the bottom horizontal plate (22) are each provided with two pairs of second-pair fasteners (23) on both ends, and the top horizontal plate (20) is provided with one pair of second-pair fasteners (23) on each end. The column (1) is provided with two first pair of fasteners (11) at the bottom and middle, and one first pair of fasteners (11) at the top.

4. The quick-installation and quick-disassembly modular protective fence according to any one of claims 1-3, characterized in that, The first pair of fasteners (11) is an n-shaped slot structure, welded to the side wall of the column (1); the second pair of fasteners (23) is a downwardly extending lug structure, which is welded to the side walls of the top crossbeam (20), the middle crossbeam (21) and the bottom crossbeam (22), and the lug structure has a gap from the side wall. The size of the lug structure is adapted to the opening size of the n-shaped slot structure, and can be fastened into the n-shaped slot structure; the gap is not less than the thickness of the n-shaped slot structure.

5. The quick-installation and quick-disassembly modular protective fence according to claim 1, characterized in that, The top crossbeam (20), the middle crossbeam (21) and the bottom crossbeam (22) are each provided with a number of drainage holes. The column (1) is a square tube or a round tube. The shape and size of the preset insertion hole (30) are adapted to the cross-sectional shape and size of the column (1).

6. The quick-installation and quick-disassembly versatile modular protective fence according to claim 1, characterized in that, When the column (1) is used as a corner column (1), the first pair of fasteners (11) on its column surface are arranged at right angles on two adjacent column surfaces.

7. The quick-installation and quick-disassembly versatile modular protective fence according to claim 4, characterized in that, The n-shaped slot structure of the first pair of plug fasteners (11) is a square structure, and the size of the hanging ear structure of the second pair of plug fasteners (23) is also a correspondingly adapted square, which can be inserted and fastened from three side directions.

8. The quick-installation and quick-disassembly versatile modular protective fence according to claim 1, characterized in that, It also includes one side of the column (1) with a hinge (40) installed at the top, middle and bottom. The other side of the hinge (40) is installed on the side wall of a set of top crossbeams (20), middle crossbeams (21) and bottom crossbeams (22). No fasteners are installed on the other side wall. This set of top crossbeams (20), middle crossbeams (21) and bottom crossbeams (22) constitutes an independent gate (51). A lock body (41) is installed on the gate (51) as a gate (51) for entering and exiting the fence.

9. The quick-installation and quick-disassembly versatile modular protective fence according to claim 1, characterized in that, Each of the columns (1) is provided with a base fixing plate (12) at its bottom end. The base fixing plate (12) is provided with several fixing holes (13) so that the fence body can be installed and fixed by inserting ground bolts into the fixing holes (13).

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