Civil engineering shielding project wall components

Abstract

The present invention relates to the field of construction engineering, and specifically to a wall component (1) for a civil engineering shielding project, which includes a vertical wall panel (2) with a bottom plate (3) provided below the wall panel (2). It is characterized in that: between the wall panel (2) and the bottom plate (3) is an integrally connected component, and the included angle α between the wall panel (2) and the bottom plate (3) is an obtuse angle. The beneficial effects are as follows: The friction between the bottom plate and the foundation and the anti-overturning moment of the wall are greatly increased, and the anti-slip and anti-overturning performance of the wall is significantly enhanced; the buried depth outside the wall is reduced, increasing the available height of the wall, reducing the self-weight, and greatly reducing the raw material cost; the wall and the bottom plate are integral precast components, which are convenient for mass production, have low cost, high precision, are easy to install, have a short construction period, and have little environmental impact. It is particularly suitable for civil engineering construction under conditions such as steep mountain slopes, and is widely used in projects such as roads, mines, terraced fields, village construction, and river and desert treatment, and the market prospect is very promising.

Description

Technical Field

[0001] The invention relates to a building material, namely a wall component of a civil engineering shielding project. Background Art

[0002] Civil engineering shielding walls, commonly known as retaining walls, are used in construction projects to block and secure slopes or mountains, as well as large volumes of earth and rock, to prevent them from sliding. These retaining walls are required for segmentation in railway, highway, mining, water conservancy, and urban transportation projects, particularly in environments with steep slopes and slopes. They are also used in mountain terrace construction, village development, and desertification control projects. Existing retaining walls primarily consist of upright wall panels and a base plate, typically constructed using materials such as reinforced concrete and cast-in-place or prefabricated methods. Cast-in-place involves integrally casting the wall at the designed location. Prefabrication, on the other hand, involves prefabricating individual wall panels using molding equipment and then joining them together to form the wall. Prefabricated wall panels offer advantages such as precise shaping, short construction times, minimal on-site disturbance, reduced environmental pollution, and easier control of construction quality, making them widely used in retaining wall construction.

[0003] However, the angle between the base plate and the vertical wall panels in current retaining wall components is 90 degrees. In addition to the downward force of gravity, the material on one side of the wall also exerts a horizontal lateral pressure on the wall panels. This lateral pressure can cause the wall to slide outward or even flip over. Therefore, a stable wall must be able to withstand this lateral pressure. Mechanical knowledge shows that to prevent wall sliding, there must be sufficient friction between the base plate and the foundation below. To prevent wall flipping, the torque generated by the pressure above the base plate, in the opposite direction of flipping, must be greater than the flipping torque. Friction is the product of the coefficient of friction between the contacting materials and the vertical pressure. The anti-flipping torque is the product of the vertical pressure on the base plate, especially at its outer end, and the distance from the wall. Clearly, the weight of the material above the base plate is a significant component of this vertical pressure, which is already determined when the wall is constructed. Therefore, to prevent wall slippage, it is necessary to improve the mechanical properties of the wall components to increase the friction between the base plate and the foundation, as well as the overall anti-flipping torque of the wall. To combat this, existing projects primarily employ methods such as increasing the wall's deadweight, lengthening the base plate, and increasing the depth of the wall's exterior to prevent it from sliding and flipping. Obviously, these methods require larger wall panels, increasing the cost of the wall and increasing the difficulty and cost of construction.

[0004] In addition, the existing prefabricated wall panels and base panels are mostly separate structures that need to be assembled on site. They have poor integrity, low connection strength, and increase the difficulty of construction.

[0005] Furthermore, in high-risk sites such as debris flows, landslides, and large-scale material collapses, retaining walls will also be damaged, resulting in sliding and overturning accidents. Currently, existing retaining walls do not have any accident warning or alarm functions. Moreover, equipment with warning and alarm functions belongs to high-tech products and is costly, making it unsuitable for use in conventional civil engineering projects. Summary of the Invention

[0006] The object of the present invention is to provide a wall component for a civil engineering shielding project with high stability, good anti-sliding and anti-overturning performance, smaller self-weight, easy production, convenient construction, short installation period, and little negative impact on the environment.

[0007] Another object of the present invention is that the wall component for the civil engineering shielding project has a function of predicting or alarming sliding and overturning failures, which can prevent losses caused by geological disasters.

[0008] The above object is achieved by the following technical solution: A wall component for a civil engineering shielding project includes a vertical wall panel, and a bottom plate is provided below the wall panel. The feature is that: the included angle between the wall panel and the bottom plate is an obtuse angle.

[0009] The wall panel and the bottom plate are integrally precast components that are fixedly connected, and the included angle between the wall panel and the bottom plate is 100 - 110 degrees.

[0010] The included angle between the wall panel and the bottom plate is 105 degrees.

[0011] A buttress is provided between the wall panel and the bottom plate.

[0012] Grooves are provided on both side edges of the wall panel, or grooves and tenons that match each other are respectively provided.

[0013] Drainage holes are provided on the side of the wall panel.

[0014] The outer end width of the bottom plate is smaller than the inner width.

[0015] Anchor holes for installing anchor feet are provided on the bottom plate.

[0016] A deformation alarm is provided below the bottom plate.

[0017] The housing of the deformation alarm is a sleeve, which is divided into an upper sleeve and a lower sleeve. The upper end of the upper sleeve is connected to the bottom plate, the upper end of the lower sleeve is slidably inserted into the lower part of the upper sleeve, and a flexible seal is provided between them. A pull rod is provided inside the sleeve. The upper end of the pull rod is connected to the bottom plate, and the lower part extends out a rod-shaped movable electrode to one side. A fixed electrode is provided above the movable electrode, and the lower part of the fixed electrode is connected to the base of the lower sleeve. The movable electrode and the fixed electrode are respectively equipped with wires, and the two wires extend out of the wall component and form the circuit of the alarm together with the power supply and the alarm device.

[0018] An action amplification device is provided between the pull rod and the movable electrode of the deformation alarm.

[0019] The action amplification device between the pull rod and the movable electrode is as follows: A section of the lower part of the pull rod is a vertical driving rack, which is in transmission with a small gear. The small gear and the large gear are coaxial, and the large gear is in transmission with a vertical driven rack. The movable electrode is installed on one side of the driven rack.

[0020] The upper sleeve and the pull rod pass through the bottom plate and are connected to the wall panel through the buttress.

[0021] The beneficial effects of the present invention are as follows: The included angle between the wall panel and the bottom plate is an obtuse angle, the friction between the bottom plate and the foundation and the anti-overturning moment of the wall body are greatly increased, and the anti-slip and anti-overturning performance of the wall body is significantly enhanced; The buried depth on the outside of the wall body is reduced, the available height of the wall body is increased, the self-weight is reduced, and the raw material cost is greatly reduced; The wall body and the bottom plate are integral precast components, which are convenient for mass production, have low cost, high precision, are easy to install, have a short construction period, and have little environmental impact. It is particularly suitable for civil engineering construction under conditions such as steep mountain slopes, and is widely used in projects such as roads, mines, terraced fields, village construction, and river and desert treatment, and has a very promising market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the front view of the first embodiment;

[0023] Figure 2 is the left view of the first embodiment;

[0024] Figure 3 is the top view of the first embodiment;

[0025] Figure 4 is the structural diagram of the prior art of the first embodiment;

[0026] Figure 5 is the installation structural diagram of the first embodiment;

[0027] Figure 6 is the front view of the second embodiment;

[0028] Figure 7 is the left view of the second embodiment;

[0029] Figure 8 is the top view of the second embodiment;

[0030] Figure 9 is the front view of the third embodiment;

[0031] Figure 10 is the left view of the third embodiment;

[0032] Figure 11It is the front view of the fourth embodiment;

[0033] Figure 12 It is the left view of the fourth embodiment;

[0034] Figure 13 It is the front view of the fifth embodiment;

[0035] Figure 14 It is the left view of the fifth embodiment;

[0036] Figure 15 It is the top view of the fifth embodiment;

[0037] Figure 16 It is the front view of the wall component of the sixth embodiment;

[0038] Figure 17 It is the right view of the wall component of the sixth embodiment;

[0039] Figure 18 It is the perspective view of the wall component of the sixth embodiment;

[0040] Figure 19 It is the assembled perspective view of the wall component of the sixth embodiment;

[0041] Figure 20 It is the front view of the mechanical parameter analysis of the experimental wall panel of the sixth embodiment;

[0042] Figure 21 It is the top view of the mechanical parameter analysis of the experimental wall panel of the sixth embodiment;

[0043] Figure 22 It is the front view of the seventh embodiment;

[0044] Figure 23 It is the enlarged front view of the component deformation alarm of the seventh embodiment;

[0045] Figure 24 It is the simple circuit diagram of the seventh embodiment;

[0046] Figure 25 It is the front view of the eighth embodiment;

[0047] Figure 26 It is the front view of the ninth embodiment;

[0048] Figure 27 It is the partial enlarged view of the ninth embodiment;

[0049] Figure 28 It is the partial enlarged view of the ninth embodiment.

[0050] As shown in the figure: wall member 1, wall panel 2, bottom plate 3, buttress 4, groove 5, drain hole 6, tenon 7, anchor hole 8, deformation alarm 9, sleeve 10, upper sleeve 11, lower sleeve 12, tie rod 13, movable electrode 14, fixed electrode 15, wire 16, hanging ring 17, positioning disk 18, driving rack 19, pinion 20, gear 21, driven rack 22. Detailed implementation mode

[0051] The first embodiment: In order to improve the performance of the existing retaining wall, a wall member for a civil engineering shielding project is provided. As Figure 1 、 Figure 2 、 Figure 3 shown, the main body of this wall member 1 is also an upright wall panel 2, and a bottom plate 3 extending towards one side of the wall panel is provided below the wall panel. The improvement is that the wall panel and the bottom plate are fixedly connected together, preferably a precast reinforced cement concrete member. The included angle between the wall panel and the bottom plate is not a right angle, but an obtuse angle greater than 90 degrees. According to a large number of experiments and calculations, the obtuse angle should be between 100 - 110 degrees, preferably 105 degrees.

[0052] Figure 4 The installation structure of the previous wall panel was introduced. The included angle between the wall panel and the bottom plate in the figure is 90 degrees. When installing, a large area of hard foundation is required, and a large burial depth is also required on the outside.

[0053] Figure 5 The installation structure of the present wall panel is introduced. Since the included angle between the bottom plate and the wall panel is an obtuse angle, which can reach 105 degrees, its hard foundation only needs 1 / 3 or 1 / 2 of the original. And no burial depth is required on the outside, which is equivalent to reducing a section of the wall. Experimental results show that for a wall with a height of 2000mm, Figure 4 the burial depth requires 500mm, while Figure 5 does not require burial depth, saving a part of raw materials and working hours. In addition, the friction force and anti-overturning moment of this structure are greatly increased, and the self-specification is also reduced accordingly. Through experiments and calculations, for the same anti-slip and anti-overturning indicators, the self-weight ratio of the original retaining wall panel to the present wall member = 2800:805.

[0054] Furthermore, the outer end width of the bottom plate is smaller than the inner width. As Figure 2 、 Figure 3 shown, the bottom plate is not a complete square or rectangle, but a trapezoidal plate with the outer end side line shorter than the inner end side line, that is, the joint line between the bottom plate and the wall panel. The advantage of this shape is that when building a curved retaining wall, a certain included angle can be formed between the side surfaces of two adjacent wall panels. Of course, for a straight wall, the construction is also very convenient. Of course, for a straight wall, this trapezoidal bottom plate can be not adopted, and a rectangular bottom plate can be made.

[0055] Second embodiment: An improvement based on the first embodiment. As Figure 6 , Figure 7 , Figure 8 shown, a buttress 4 is provided between the wall panel 2 and the bottom plate 3. As can be seen from the figure, the buttress is a reinforcing rib commonly used in rigid members, and can be a triangular plate surface. The inner side is fixedly connected to the wall panel, and the bottom side is fixedly connected to the bottom plate. Preferably, it is an integral component cast integrally with the wall panel and the bottom plate, and can play a role in supporting and connecting the wall panel.

[0056] Third embodiment: An improvement based on the foregoing embodiment. As Figure 9 , Figure 10 shown, grooves 5 are provided on both side edges of the wall panel. If the soil retaining surface of the wall panel is called the inner side surface and its outer side is called the outer side surface, the two side edges here refer to the left and right sides, that is, the side surfaces of the thickness of the wall panel. Such vertical grooves 5 are opened on these two side surfaces, and the cross-section of the groove can be semicircular or triangular, etc. The function of the groove is to seal the joint of the wall panel. Because when building a retaining wall, multiple wall panels need to be combined one by one. The joint between two adjacent wall panels needs to be sealed. With such grooves, cement mortar or other adhesives can be filled in this groove, and after the adjacent wall panels are butted, they can be firmly bonded together, greatly enhancing the strength and airtight performance of the retaining wall.

[0057] In addition, in view of the problem that a separate drainage pipeline needs to be provided for the existing retaining wall, drainage holes are provided at the joints of the wall panels in this example, thus eliminating the original drainage device. As shown in the figure, the drainage hole 6 of each wall panel is a half hole, and the position is below the groove. When combining, after two wall panels face each other, the two half holes are aligned to form a through hole, and the accumulated water in the soil and stone materials on one side of the retaining wall can be discharged in time.

[0058] Fourth embodiment: An improvement based on the third embodiment. As Figure 11 , Figure 12 shown, grooves 5 and tenons 7 that cooperate with each other are provided on both side edges of the wall panel 2. That is, on the left and right sides of the same wall panel, grooves and tenons are provided respectively. When building the wall, when two adjacent wall panels are butted, the tenon of one wall panel just inserts into the groove of the other wall panel. In this way, the two wall panels can be tightly connected. At the same time, the joint and the drainage hole are adjacent up and down, which can further enhance the drainage function.

[0059] Fifth embodiment: An improvement based on the foregoing embodiment. As Figure 13 , Figure 14 , Figure 15As shown, the base plate 3 is provided with anchor holes 8 for installing anchor feet. The function of the anchor holes is that when building a retaining wall, first build the foundation of the wall, then install the retaining wall panel on the foundation, and then pour concrete into the anchor holes. After solidification, high-strength fixed piles will be formed. Of course, other rigid connectors can also be driven in as anchor feet.

[0060] Sixth embodiment: On the basis of the foregoing embodiments, an experimental example is cited to prove the good stability and economy of the retaining wall panel.

[0061] 1. The structure of the wall components used in the experiment is as Figure 16 、 Figure 17 、 Figure 18 shown, and the wall assembled by this wall component is as Figure 19 shown.

[0062] (1) The main parameters of the wall components are as follows:

[0063]

[0064] (2) The structural mechanics parameters of the wall components for the experiment (such as Figure 20 、 Figure 21 shown) are as follows:

[0065]

[0066]

[0067] Weight ∑W = 52.977kN, center of gravity ∑x = ∑mi = 33.871 = 0.639

[0068] 2. Earth pressure (for stability calculation) (equilibrium state calculation)

[0069] The equivalent height of soil for the superimposed load (superimposed load q = 10KN / m 2 )

[0070]

[0071] Earth pressure coefficient KA = 0.297

[0072] Wall friction angle θ = 30°

[0073] Earth pressure (assuming height H = 2.00m)

[0074]

[0075] Horizontal component force PH = Pcosθ = 16.64x cos30° = 14.41kN

[0076] Vertical component of force PV = Psinθ = 16.64 x sin30° = 8.32 kN

[0077] Position of action Y = H / 3·(1 + h / (H + 2h))

[0078] = 2.00 / 3 x (1 + 0.556 / (2.00 + 2 x 0.556))

[0079] = 0.786 m

[0080] Moment of force

[0081] MO = PH·Y = 14.41 x 0.786 = 11.32 kN·m

[0082] 3. Calculation of load (parameters for stability calculation)

[0083]

[0084] Horizontal component of force ∑H = 14.41 kN

[0085] Vertical component of force ∑V = 61.29 kN

[0086] Position of action of the resultant force

[0087]

[0088] Eccentricity of the load

[0089]

[0090] 4. Equilibrium state calculation

[0091] (1) Discussion on tipping

[0092]

[0093] (2) Discussion on sliding

[0094] Inclination angle of the bottom plate α = 15°

[0095]

[0096]

[0097]

[0098] The directions of the forces are opposite, resulting in a negative value, so the absolute value is selected

[0099] 11.8 ≥ Fs = 1.5... OK

[0100] (3) Support force

[0101]

[0102] (4) Balance Summary Table

[0103]

[0104] The seventh embodiment: It is improved on the basis of the foregoing embodiments. As Figure 22 shown, a deformation alarm 9 is provided under the bottom plate 3. This deformation alarm can send out an alarm signal at the beginning of the wall slipping or flipping. Obviously, there are various devices that can achieve the above purpose, but they all belong to high-tech products with high costs and are difficult to popularize and apply. This example attempts to introduce a deformation alarm with a simple structure and low cost. Combining with the attached Figure 23 figures, it can be seen that the housing of this deformation alarm 9 is a sleeve 10, which is divided into an upper sleeve 11 and a lower sleeve 12. The upper end of the upper sleeve is connected to the bottom plate 3. For the convenience of installation and debugging, it is best to open a through hole on the bottom plate, install this deformation alarm under the through hole, and seal it with a gland on the top. The upper end of the lower sleeve is slidably inserted into the lower part of the upper sleeve. Preferably, the lower sleeve is inserted into the upper sleeve and sealed with a highly elastic flexible material between them. A pull rod 13 is provided inside the sleeve. The upper end of the pull rod is connected to the bottom plate. Preferably, there is an internal thread inside the upper sleeve, which is matched with a positioning disc 18 with an external thread. A through hole is opened in the middle of the positioning disc. The upper end of the pull rod extends out of the through hole and is fixed with a clamping plate larger than the through hole. Preferably, a hanging ring 17 is provided on a section of the upper section of the pull rod passing through the positioning disc downward, and the lower section of the pull rod is hung on the hanging ring through a hook. In this way, the height of the positioning disc can be adjusted conveniently and the installation of the pull rod is also facilitated. As can be seen from the figure, a rod-shaped movable electrode 14 extends from the lower end of the pull rod 13 to one side. A fixed electrode 15 is provided above the movable electrode. The lower part of the fixed electrode is connected to the base of the lower sleeve. The movable electrode and the fixed electrode are respectively equipped with wires 16. The two wires extend out of the wall member 1 and form the circuit of the alarm with the power supply and the alarm device. Obviously, there are various circuits that can meet this working requirement, Figure 24 and a simple circuit is exemplified. The switch therein is the movable electrode and the fixed electrode, and the light bulb therein represents alarm components such as sound and light.

[0105] During use, first drill a hole downward on the foundation ground. The depth of the hole should be lower than the ground outside the wall. Then, place this deformation alarm underground while installing the wall member. And adjust the gap between the movable electrode and the fixed electrode accurately. Generally, it can be about 1 mm. After the wall is installed, connect the wire of this deformation alarm to the power supply. When geological anomalies occur, causing the bottom plate to translate or swing upward, the pull rod is pulled up, the movable electrode touches the fixed electrode, the circuit is turned on, and the alarm device can send out signals such as sound or flash to inform people to take countermeasures.

[0106] As can be seen above, this alarm device has a simple structure and very low cost. Even if such devices are installed on each wall component, the increase in the cost of the wall is not significant. In fact, installing an alarm device every 50 - 100 meters can effectively give early warnings of various geological disasters such as wall collapse and landslide.

[0107] The eighth embodiment: It is improved on the basis of the foregoing embodiment. It mainly solves the problem of the gap between the movable electrode 14 and the fixed electrode 15. Since the deformation of the wall component is very small in the initial stage of geological disasters, the gap between the movable electrode and the fixed electrode cannot be too large. However, for a relatively simple device, it is very difficult to achieve a too small gap. Even if a very small gap is adjusted, misconnection is likely to occur and the stability is very poor. For this reason, in this embodiment, an action amplification device is installed between the pull rod 13 of the deformation alarm 9 and the movable electrode 14. Of course, there are many devices that can achieve this function. Only a relatively simple structure is exemplified below.

[0108] As Figure 25 shown, a lower section of the pull rod 13 is a vertical driving rack 19. The driving rack is in transmission with a small gear 20. The small gear and a large gear 21 are coaxial. The large gear is in transmission with a vertical driven rack 22. The movable electrode 14 extends out on one side of the driven rack. During operation, when the pull rod is pulled upward, the driving rack moves upward, driving the small gear to rotate. The small gear drives the large gear to rotate. The large gear drives the driven rack to move upward. The driven rack drives the movable electrode to move upward. Since there is a relatively large transmission ratio between the small gear and the large gear, with a relatively small movement distance of the driving rack, a relatively large displacement can be generated for the driven rack and the movable electrode. Therefore, the installation distance between the movable electrode and the fixed electrode can be much larger, the debugging difficulty is greatly reduced, and the stability is significantly enhanced.

[0109] The ninth embodiment: It is improved on the basis of the foregoing embodiment. It mainly solves the alarm problem when the bottom plate does not deform while the wall panel deforms. As Figure 26 shown, the upper sleeve 11 passes through the bottom plate 3 and is fixedly connected to the wall panel 2 through the buttress 4 upward. The advantage of this structure is that the structure and performance of each component below the bottom plate are not reduced, and it can still play the role of alarm when the bottom plate deforms. When the bottom plate does not deform and only the wall panel deforms, the pull rod will also be pulled to achieve the purpose of alarm.

[0110] In addition, in order to further improve the working performance, the following improvements can also be made:

[0111] Since the sleeve extends upward, a small amount of bending occurs in the section of the original sleeve passing through the positioning disk. In order to reduce the frictional resistance, as Figure 27 shown, the upper port of the middle hole of the positioning disk should be rounded.

[0112] Since the sleeves above and below the bottom plate are connected, the two wires can pass through the sleeves as Figure 28 shown. In this way, the working environment of the wires is better and faults are not likely to occur. At the same time, the dedicated insulating pipeline can be omitted, and the manufacturing cost is further reduced.

[0113] Since the probability of geological disasters is extremely low, this device may need to be buried underground for a long time. Therefore, a high level of airtightness of the structure is required. In addition to using good pipe materials and taking good airtight measures at the joints, it can also be like Figure 28 shown, filling insulating oil around the lower section of the lower sleeve, that is, around the movable electrode and the fixed electrode. In this way, moisture can be prevented, arc extinguishing can be achieved, misconnection can be prevented, and the working environment of the key components can be maintained for a long time, thereby ensuring the stability and reliability of the working performance of this device.

Claims

1. A wall component for a civil engineering shielding project, the wall component (1) comprising a vertical wall panel (2), and a bottom plate (3) is provided below the wall panel (2), characterized in that: The included angle α between the wall panel (2) and the bottom plate (3) is an obtuse angle; The wall panel (2) and the bottom plate (3) are integrally precast components fixedly connected to each other, and the included angle α between the wall panel (2) and the bottom plate (3) is 100 - 110 degrees; A buttress (4) is provided between the wall panel (2) and the bottom plate (3); Grooves (5) are provided on both sides of the wall panel (2), or grooves (5) and tenons (7) that match each other are respectively provided; Drainage holes (6) are provided on the side of the wall panel (2); The outer end width of the bottom plate (3) is smaller than the inner width; Anchor holes (8) for installing anchor feet are provided on the bottom plate (3); A deformation alarm (9) is provided under the bottom plate (3); The housing of the deformation alarm (9) is a sleeve (10), which is divided into an upper sleeve (11) and a lower sleeve (12). The upper end of the upper sleeve is connected to the bottom plate (3). The upper end of the lower sleeve is slidably inserted into the lower part of the upper sleeve, and a flexible seal is provided between them. A pull rod (13) is provided inside the sleeve. The upper end of the pull rod is connected to the bottom plate. A rod-shaped movable electrode (14) extends from the lower part of the pull rod to one side. A fixed electrode (15) is provided above the movable electrode. The lower part of the fixed electrode is connected to the base of the lower sleeve. The movable electrode and the fixed electrode are respectively equipped with wires (16). The two wires extend out of the wall member (1) and form the circuit of the deformation alarm together with the power supply and the alarm device; An action amplification device is provided between the pull rod (13) and the movable electrode (14) of the deformation alarm (9); The action amplification device between the pull rod (13) and the movable electrode (14) is: a section of the lower part of the pull rod (13) is a vertical driving rack (19). The driving rack is in transmission with a small gear (20). The small gear is coaxial with a large gear (21). The large gear is in transmission with a vertical driven rack (22). The movable electrode (14) is installed on one side of the driven rack.

2. The wall component of the civil engineering shielding project according to claim 1, characterized in that: The upper sleeve (11) and the pull rod (13) pass through the bottom plate (3) and are connected to the wall panel (2) through the buttress (4) upward; 3. The wall component of the civil engineering shielding project according to claim 1, wherein: The included angle α between the wall panel (2) and the bottom plate (3) is 105 degrees.

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