Deep foundation pit supporting and reinforcing structure for building engineering construction

Abstract

The utility model discloses a deep foundation pit supporting and reinforcing structure for building engineering construction. The deep foundation pit supporting and reinforcing structure comprises a supporting stand column, an expanding structure, a transverse supporting structure, a protective fence structure, a fixing structure, a reinforcing angle brace, a protective plate and a bolt. The whole supporting stand column is rectangular, trapezoid grooves are formed in the four faces of the supporting stand column, the middle of the supporting stand column is of a rectangular hollow structure, the upper portion of the supporting stand column is connected with the expanding structure, the lower portion of the supporting stand column is connected with the fixing structure, and the two sides of the supporting stand column are connected with the transverse supporting structures. A reinforcing angle brace is arranged in the middle of an included angle of the two groups of cross brace structures, two ends of the reinforcing angle brace are provided with 45-degree inclined surfaces, the protective fence structure is arranged in the middle of the cross brace structures and is attached to the protective plate, the protective plate is fixed between the two groups of reinforcing upright posts through bolts, and a trapezoidal boss is arranged on one side of the protective plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction engineering, and particularly relates to a deep foundation pit supporting and reinforcing structure used in construction engineering. Background Art

[0002] During the construction of building projects, the deep foundation pit support and reinforcement structure can effectively prevent the collapse and instability of the foundation pit slope, and ensure the stability of the foundation pit during the excavation process. This is the most basic function of the support structure and the prerequisite for ensuring the safety of subsequent construction. The support structure can reduce the soil pressure and water pressure generated during the excavation of the foundation pit by providing support and protection, and prevent the bottom of the foundation pit from bulging and the side wall from deforming. This helps to ensure the safety of construction workers in the foundation pit, and also helps to maintain the overall stability of the foundation pit. Moreover, during the construction of building projects, the use scenarios of the deep foundation pit support and reinforcement structure are changeable. To ensure that the deep foundation pit support and reinforcement structure can adapt to foundation pits of different sizes and heights, the support and reinforcement structure must be able to realize the expansion function to adapt to foundation pits of different sizes. In addition, the use environment must be considered to avoid setting up overly complex structures, increasing construction time, avoiding occupying large areas, and affecting the construction of building projects. Moreover, the cost should be reduced as much as possible and the construction should be facilitated.

[0003] After searching, the prior art authorization announcement number is CN 220813888 U. A large-scale deep foundation pit support and reinforcement structure includes multiple supporting walls, multiple supporting walls are fixedly connected to multiple soil nail blocks on the side facing the foundation pit, multiple supporting walls are provided with slots on both sides of the foundation pit that are perpendicular to the foundation pit, multiple slots are slidably connected with card plates, multiple supporting walls are fixedly connected to connecting components in the middle of the side away from the foundation pit, multiple supporting walls are fixedly connected to force frames in the middle of the side away from the foundation pit, and multiple force frames are detachably connected to columns on the bottom side away from the supporting wall. The multiple structures of the device are divided into different units; the structure forms a stable support for the foundation pit by forming a stable connection between the multiple structures, so as to adapt to foundation pits of different shapes, but can only be used in foundation pits of different lengths and widths. The depth of the foundation pit changes after excavation, and the structure does not have an expansion structure for the upper and lower depths.

[0004] After searching, the prior art authorization publication number is CN 118441714 A, which is a support and reinforcement device and protective structure for a deep foundation pit, including support columns that match the depth of the foundation pit. Each support column consists of a pile and at least one extension column. Adjacent piles and extension columns are connected by coaxial plug-in to form a rectangular layout of support columns at the four corners of the foundation pit. Protective structures are inserted between the piles and extension columns to form a multi-layer closed structure. Four protective structures on each layer enclose a reinforcement area. A bottom support mechanism is provided at the bottom of the reinforcement area to connect the bottoms of the four protective structures on each layer. A first reinforcement mechanism is installed above to support the back of the protective structure and connect adjacent bottom support mechanisms. The second reinforcement mechanism strengthens the angle connection of the support structure to achieve primary reinforcement. The first reinforcement mechanism supports from the center outward to achieve secondary reinforcement, thereby improving the overall support and reinforcement effect of the deep foundation pit. The mechanism cannot be expanded to apply to foundation pits of different shapes, and the reinforcement mechanism in the middle occupies too large an area, affecting construction. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a deep foundation pit support and reinforcement structure for construction engineering. By means of trapezoidal grooves provided on the four sides of the supporting columns, cross bracing structures are arranged in four directions to widen and lengthen the entire structure; the expansion structure heightens and expands the entire structure; the manual hydraulic jacks of the cross bracing structure tighten the two groups of supporting columns, thereby reducing the gap between the support and reinforcement structure and the inner wall of the foundation pit and increasing the stability of the entire structure.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A deep foundation pit support and reinforcement structure for construction engineering, including supporting columns, expansion structure, cross bracing structure, guardrail structure, fixed structure, reinforced angle bracing, guard plate, and bolts; the supporting columns are rectangular as a whole, with trapezoidal grooves on all four sides and a rectangular hollow structure in the middle, the upper part of the supporting columns is connected to the expansion structure, the lower part of the supporting columns is connected to the fixed structure, the two sides of the supporting columns are connected to the cross bracing structure, the supporting columns are expanded to all sides to increase cross bracing structures as needed, a reinforced angle bracing is provided in the middle of the angle between the two groups of cross bracing structures, and 45° inclined surfaces are provided at both ends of the reinforced angle bracing, the guardrail structure is arranged in the middle of the cross bracing structure and fits with the guard plate, the guard plate is fixed between the two groups of reinforced columns by bolts, and a trapezoidal boss is provided on one side of the guard plate.

[0008] The expansion structure includes an L-shaped plate I, a pad I, a triangular reinforcement rib I, and a fixed rectangular tube I; the fixed rectangular tube I passes through the L-shaped plate I and is fixedly connected to the L-shaped plate I, the fixed rectangular tube I on the upper and lower parts of the L-shaped plate I is symmetrically distributed, the size of the fixed rectangular tube I is consistent with the hollow size of the supporting column, two groups of supporting columns are sleeved on the fixed rectangular tube I from the upper and lower directions, one end of the supporting column is fitted with the L-shaped plate I, and then the triangular reinforcement rib I is fixedly connected to the L-shaped plate I, the supporting column, and the fixed rectangular tube I by bolts, and two groups of pads are also provided on the fitting surface of the triangular reinforcement rib I and the supporting column, and the fitting surface of the L-shaped plate I to ensure that the triangular reinforcement rib I is fixedly connected to the L-shaped plate I, the supporting column, and the fixed rectangular tube I; several groups of supporting columns are longitudinally connected as needed to expand the overall size of the deep foundation pit support and reinforcement structure.

[0009] The fixing structure includes an L-shaped plate II, a pad II, a triangular reinforcing rib II, a fixed rectangular tube II, and a conical fixing piece; one end of the fixed rectangular tube II is fixedly connected to the L-shaped plate II, one end of the supporting column is sleeved on the fixed rectangular tube II, and the bottom surface is in contact with the L-shaped plate II; three groups of conical fixing pieces are provided on the bottom surface of the L-shaped plate II, and the conical fixing pieces are fixedly connected to the L-shaped plate II, and then the triangular reinforcing rib II is fixedly connected to the L-shaped plate II, the supporting column, and the fixed rectangular tube II by bolts; the contact surface between the triangular reinforcing rib II and the L-shaped plate II and the supporting column is further provided with a pad II; when the lower part of the supporting column contacts the soil, the fixing structure is connected, and the conical fixing piece provided at the lower part of the L-shaped plate II is inserted into the soil to fix the supporting column on the soil, making the overall structure more stable.

[0010] The cross bracing structure includes a connecting rectangular tube, a supporting crossbeam, a manual hydraulic jack, a fixed rectangular tube III, a fixed rectangular tube IV, and a triangular reinforcement rib III; a trapezoidal protrusion is provided at one end of the connecting rectangular tube, and a rectangular hollow structure is provided at the other end. The trapezoidal protrusion at one end of the connecting rectangular tube is arranged in the trapezoidal groove of the supporting column and is slidably connected to the supporting column. When the connecting rectangular tube reaches the appropriate position, a group of triangular reinforcement ribs III are provided at the bottom of the connecting rectangular tube to connect the connecting rectangular tube and the supporting column. The supporting crossbeam is sleeved inside the connecting rectangular tube, and a rectangular reinforcement rib is provided on the side of the supporting beam. An opening is provided, and the supporting beam, the connecting rectangular tube and the supporting column are fixedly connected by setting a group of triangular reinforcement ribs III on the upper part of the connecting rectangular tube. A manual hydraulic jack is provided between the two groups of supporting beams. A fixed rectangular tube III is also provided in the rectangular opening on the supporting beam. Rectangular openings are also provided on both sides of the fixed rectangular tube III. A fixed rectangular tube IV is provided in the rectangular opening. The fixed rectangular tube III and the fixed rectangular tube IV are fixedly connected by bolts. The manual hydraulic jack lifts the supporting beams on both sides, and then the supporting beams are fixed by the two groups of fixed rectangular tubes III and the fixed rectangular tube IV.

[0011] The guardrail structure includes a positioning support plate and a connecting rod guardrail; the connecting rod guardrail is arranged between two groups of positioning support plates, and the connecting rod guardrail is extended or shortened through the mutual cooperation between the connecting rods. The two groups of positioning support plates are arranged between the triangular reinforcement ribs III and the triangular reinforcement ribs II. One side of the connecting rod guardrail is close to the guard plate, which plays the role of supporting the guard plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1) The supporting columns are rectangular in shape, with trapezoidal grooves on all four sides. These grooves cooperate with the trapezoidal protrusions on the rear end of the connecting rectangular tubes, and horizontal bracing structures are provided in four directions to widen and lengthen the entire structure. The fixed rectangular tube I of the expansion structure is connected to two sets of supporting columns, and the triangular reinforcement rib I is fixedly connected to the L-shaped plate I, the supporting columns, and the fixed rectangular tube I by bolts, thereby increasing the height and expansion of the entire structure.

[0014] 2) The fixed rectangular tube II of the fixed structure is sleeved on the supporting column. One end of the fixed rectangular tube II is fixedly connected to the L-shaped plate II. Three sets of conical fixings are provided on the bottom surface of the L-shaped plate II. The conical fixings are fixedly connected to the L-shaped plate II. The triangular reinforcement II is then fixedly connected to the L-shaped plate II, the supporting column, and the fixed rectangular tube II by bolts. By setting up multiple sets of conical fixings and driving them into the soil, the overall structure is stabilized.

[0015] 3) A trapezoidal boss is provided on one side of the guard plate. The trapezoidal boss increases the contact area between the guard plate and the inner wall of the foundation pit, increases the fixed friction, and stabilizes the soil layer on the inner wall of the foundation pit. The guard plate is then supported and protected by the connecting rod guardrail, reducing the possibility of accidents.

[0016] 4) The manual hydraulic jack of the cross bracing structure tightens the two sets of supporting columns, and then the distance between the two sets of supporting columns is fixed through the coordination between the fixed rectangular tube III, the fixed rectangular tube IV, and the supporting crossbeam, thereby reducing the gap between the support reinforcement structure and the inner wall of the foundation pit and increasing the overall stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 This is a schematic diagram of a deep foundation pit support reinforcement structure for construction engineering. Figure 1 ;

[0018] Attachment Figure 2 This is a schematic diagram of a deep foundation pit support reinforcement structure for construction engineering. Figure 2 ;

[0019] Attachment Figure 3 It is attached Figure 1 Explosion diagram of the expanded structure;

[0020] Attachment Figure 4 It is attached Figure 2Explosion diagram of the fixed structure;

[0021] Attachment Figure 5 It is attached Figure 2 Explosion diagram of the middle cross brace structure Figure 1 ;

[0022] Attachment Figure 6 It is attached Figure 2 Explosion diagram of the middle cross brace structure Figure 2 ;

[0023] Attachment Figure 7 It is attached Figure 2 Schematic diagram of the middle guardrail structure;

[0024] Attachment Figure 8 It is attached Figure 2 Explosion diagram of the middle guardrail structure;

[0025] Attachment Figure 9 This is a schematic diagram of an explosive structure for supporting and reinforcing a deep foundation pit used in construction engineering of the utility model;

[0026] In the figure: 11. Support column; 12. Expansion structure; 13. Cross bracing structure; 14. Guardrail structure; 15. Fixed structure; 16. Reinforced angle brace; 17. Guard plate; 18. Bolt; 101. L-shaped plate I; 102. Pad I; 103. Triangular reinforcement rib I; 104. Fixed rectangular tube I; 201. L-shaped plate II; 202. Pad II; 203. Triangular reinforcement rib II; 204. Fixed rectangular tube II; 205. Conical fixing piece; 301. Connecting rectangular tube; 302. Support beam; 303. Manual hydraulic jack; 304. Fixed rectangular tube III; 305. Fixed rectangular tube IV; 306. Triangular reinforcement rib III; 401. Positioning support plate; 402. Connecting rod guardrail. DETAILED DESCRIPTION

[0027] To facilitate understanding by those skilled in the art, Figure 1-9 , the technical solution of the utility model is further described in detail.

[0028] A deep foundation pit support and reinforcement structure for construction engineering, including a supporting column 11, an expansion structure 12, a cross bracing structure 13, a guardrail structure 14, a fixed structure 15, a reinforced angle brace 16, a guard plate 17, and a bolt 18; the supporting column 11 is rectangular as a whole, with trapezoidal grooves on all four sides and a rectangular hollow structure in the middle, the upper part of the supporting column 11 is connected to the expansion structure 12, the lower part of the supporting column 11 is connected to the fixed structure 15, and the two sides of the supporting column 11 are connected to the cross bracing structure 13. The supporting column 11 is expanded to all sides to increase the cross bracing structure 13 as needed, a reinforced angle brace 16 is provided in the middle of the angle between the two groups of cross bracing structures 13, and a 45° inclined surface is provided at both ends of the reinforced angle brace 16. The guardrail structure 14 is arranged in the middle of the cross bracing structure 13 and is in contact with the guard plate 17. The guard plate 17 is fixed between the two groups of reinforcing columns by bolts 18, and a trapezoidal boss is provided on one side of the guard plate 17.

[0029] The expansion structure 12 includes an L-shaped plate Ⅰ101, a pad Ⅰ102, a triangular reinforcement rib Ⅰ103, and a fixed rectangular tube Ⅰ104; the fixed rectangular tube Ⅰ104 passes through the L-shaped plate Ⅰ101 and is fixedly connected to the L-shaped plate Ⅰ101. The fixed rectangular tube Ⅰ104 is symmetrically distributed in the upper and lower parts of the L-shaped plate Ⅰ101. The size of the fixed rectangular tube Ⅰ104 is consistent with the hollow size of the support column 11. The two groups of support columns 11 are sleeved on the fixed rectangular tube Ⅰ104 from the upper and lower directions. One end of the support column 11 is connected to the L-shaped plate Ⅰ 101 is fitted together, and then the triangular reinforcement rib Ⅰ103 is fixedly connected to the L-shaped plate Ⅰ101, the supporting column 11, and the fixed rectangular tube Ⅰ104 by means of bolts 18. Two sets of pads are also provided on the fitting surfaces of the triangular reinforcement rib Ⅰ103 and the supporting column 11 and the fitting surfaces of the L-shaped plate Ⅰ101 to ensure that the triangular reinforcement rib Ⅰ103 is fixedly connected to the L-shaped plate Ⅰ101, the supporting column 11, and the fixed rectangular tube Ⅰ104. Several sets of supporting columns 11 are longitudinally connected as needed to expand the overall size of the deep foundation pit support and reinforcement structure.

[0030] The fixing structure 15 includes an L-shaped plate II 201, a pad II 202, a triangular reinforcement rib II 203, a fixed rectangular tube II 204, and a conical fixing piece 205; one end of the fixed rectangular tube II 204 is fixedly connected to the L-shaped plate II 201, one end of the support column 11 is sleeved on the fixed rectangular tube II 204, and the bottom surface is in contact with the L-shaped plate II 201. The bottom surface of the L-shaped plate II 201 is provided with three groups of conical fixing pieces 205, and the conical fixing piece 205 is fixedly connected to the L-shaped plate II 201, and then through Bolts 18 securely connect the triangular reinforcement ribs II 203 to the L-shaped plate II 201, the support column 11, and the fixed rectangular tube II 204. Pads II 202 are also provided on the contact surfaces between the triangular reinforcement ribs II 203 and the L-shaped plate II 201 and the support column 11. When the lower portion of the support column 11 contacts the soil, the connecting fixing structure 15 is inserted into the soil through the conical fixing piece 205 provided at the lower portion of the L-shaped plate II 201, thereby securing the support column 11 to the soil and making the overall structure more stable.

[0031] The cross bracing structure 13 includes a connecting rectangular tube 301, a supporting crossbeam 302, a manual hydraulic jack 303, a fixed rectangular tube III 304, a fixed rectangular tube IV 305, and a triangular reinforcing rib III 306; one end of the connecting rectangular tube 301 is provided with a trapezoidal protrusion, and the other end is a rectangular hollow structure. The trapezoidal protrusion at one end of the connecting rectangular tube 301 is set in the trapezoidal groove of the supporting column 11 and is slidably connected to the supporting column 11. When the connecting rectangular tube 301 reaches a suitable position, a group of triangular reinforcing ribs III 306 are set at the bottom of the connecting rectangular tube 301 to connect the connecting rectangular tube 301 and the supporting column 11. The supporting crossbeam 302 is sleeved inside the connecting rectangular tube 301, and a rectangular opening is provided on the side of the supporting crossbeam 302. The supporting crossbeam 302, the connecting rectangular tube 301 and the supporting column 11 are fixedly connected by setting a group of triangular reinforcement ribs III 306 on the upper part of the connecting rectangular tube 301. A manual hydraulic jack 303 is provided between the two groups of supporting crossbeams 302. A fixed rectangular tube III 304 is also provided in the rectangular opening on the supporting crossbeam 302. Rectangular openings are also provided on both sides of the fixed rectangular tube III 304. Fixed rectangular tubes IV 305 are provided in the rectangular openings. The fixed rectangular tubes III 304 and the fixed rectangular tubes IV 305 are fixedly connected by bolts 18. The manual hydraulic jacks 303 lift the supporting crossbeams 302 on both sides, and then the supporting crossbeams 302 are fixed by the two groups of fixed rectangular tubes III 304 and the fixed rectangular tubes IV 305.

[0032] The guardrail structure 14 includes a positioning support plate 401 and a connecting rod guardrail 402; the connecting rod guardrail 402 is arranged between two groups of positioning support plates 401, and the connecting rod guardrail 402 is extended or shortened through the mutual cooperation between the connecting rods. The two groups of positioning support plates 401 are arranged between the triangular reinforcement rib III306 and the triangular reinforcement rib II203. One side of the connecting rod guardrail 402 is close to the guard plate 17, which plays the role of supporting the guard plate 17.

[0033] In the description of the present invention, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", etc. indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0034] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.

Claims

1. A deep foundation pit support and reinforcement structure for construction engineering, comprising support columns, expansion structures, cross bracing structures, guardrail structures, fixing structures, reinforced angle braces, guard plates, and bolts; characterized in that The supporting column is rectangular as a whole, with trapezoidal grooves on all four sides and a rectangular hollow structure in the middle. The upper part of the supporting column is connected to the expansion structure, the lower part of the supporting column is connected to the fixed structure, and the two sides of the supporting column are connected to the cross-bracing structure. The supporting column is expanded to the four sides to increase the cross-bracing structure as needed. A reinforcing angle brace is provided in the middle of the angle between the two groups of cross-bracing structures, and a 45° inclined surface is provided at both ends of the reinforcing angle brace. The guardrail structure is arranged in the middle of the cross-bracing structure and fits with the guard plate. The guard plate is fixed between the two groups of reinforcing columns by bolts, and a trapezoidal boss is provided on one side of the guard plate. The expanded structure includes an L-shaped plate I, a pad I, a triangular reinforcement rib I, and a fixed rectangular tube I; the fixed rectangular tube I passes through the L-shaped plate I and is fixedly connected to the L-shaped plate I. The fixed rectangular tube I is symmetrically distributed on the upper and lower parts of the L-shaped plate I. The size of the fixed rectangular tube I is consistent with the hollow size of the supporting column. Two groups of supporting columns are sleeved on the fixed rectangular tube I from the upper and lower directions. One end of the supporting column is fitted with the L-shaped plate I, and then the triangular reinforcement rib I is fixedly connected to the L-shaped plate I, the supporting column, and the fixed rectangular tube I by bolts. Two groups of pads are also provided on the fitting surface of the triangular reinforcement rib I and the supporting column, and the fitting surface of the L-shaped plate I to ensure that the triangular reinforcement rib I is fixedly connected to the L-shaped plate I, the supporting column, and the fixed rectangular tube I; several groups of supporting columns are longitudinally connected as needed to expand the overall size of the deep foundation pit support and reinforcement structure.

2. A deep foundation pit support and reinforcement structure for construction engineering according to claim 1, characterized in that The cross bracing structure includes a connecting rectangular tube, a supporting crossbeam, a manual hydraulic jack, a fixed rectangular tube III, a fixed rectangular tube IV, and a triangular reinforcement rib III; a trapezoidal protrusion is provided at one end of the connecting rectangular tube, and a rectangular hollow structure is provided at the other end. The trapezoidal protrusion at one end of the connecting rectangular tube is arranged in the trapezoidal groove of the supporting column and is slidably connected to the supporting column. When the connecting rectangular tube reaches the appropriate position, a group of triangular reinforcement ribs III are provided at the bottom of the connecting rectangular tube to connect the connecting rectangular tube and the supporting column. The supporting crossbeam is sleeved inside the connecting rectangular tube, and a rectangular reinforcement rib is provided on the side of the supporting beam. An opening is provided, and the supporting beam, the connecting rectangular tube and the supporting column are fixedly connected by setting a group of triangular reinforcement ribs III on the upper part of the connecting rectangular tube. A manual hydraulic jack is provided between the two groups of supporting beams. A fixed rectangular tube III is also provided in the rectangular opening on the supporting beam. Rectangular openings are also provided on both sides of the fixed rectangular tube III. A fixed rectangular tube IV is provided in the rectangular opening. The fixed rectangular tube III and the fixed rectangular tube IV are fixedly connected by bolts. The manual hydraulic jack lifts the supporting beams on both sides, and then the supporting beams are fixed by the two groups of fixed rectangular tubes III and the fixed rectangular tube IV.

3. A deep foundation pit support and reinforcement structure for construction engineering according to claim 1, characterized in that The fixing structure includes an L-shaped plate II, a pad II, a triangular reinforcing rib II, a fixed rectangular tube II, and a conical fixing piece; one end of the fixed rectangular tube II is fixedly connected to the L-shaped plate II, one end of the supporting column is sleeved on the fixed rectangular tube II, and the bottom surface is in contact with the L-shaped plate II; three groups of conical fixing pieces are provided on the bottom surface of the L-shaped plate II, and the conical fixing pieces are fixedly connected to the L-shaped plate II; the triangular reinforcing rib II is fixedly connected to the L-shaped plate II, the supporting column, and the fixed rectangular tube II by bolts; the contact surface between the triangular reinforcing rib II and the L-shaped plate II and the supporting column is further provided with a pad II; when the lower part of the supporting column contacts the soil, the fixing structure is connected, and the conical fixing piece provided at the lower part of the L-shaped plate II is inserted into the soil to fix the supporting column to the soil.

4. A deep foundation pit support and reinforcement structure for construction engineering according to claim 1, characterized in that The guardrail structure includes a positioning support plate and a connecting rod guardrail; the connecting rod guardrail is arranged between two groups of positioning support plates, and the connecting rod guardrail is extended or shortened through the mutual cooperation between the connecting rods. The two groups of positioning support plates are arranged between the triangular reinforcement ribs III and the triangular reinforcement ribs II, and one side of the connecting rod guardrail is close to the guardplate.

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