Environment-friendly dustproof spraying device for building construction

Abstract

The application discloses an environment-friendly building construction dustproof spraying device and relates to the technical field of dustproof spraying. The device comprises a fixed channel, a deceleration belt is slidably arranged at the bottom of the fixed channel, a fixed frame is fixedly arranged at the top of the fixed channel, a rotating shaft is rotatably arranged in the fixed frame, an installation frame is fixedly arranged on the circumferential surface of the rotating shaft, a spraying head is fixedly arranged on the circumferential surface of the installation frame, a connecting rod is fixedly arranged at the top of the deceleration belt, and a nozzle is fixedly arranged at the top of the installation frame. The device can avoid bringing dust into or out of a building site, reduces the influence of a muck truck on the building site, improves the dustproof effect of building construction, and increases the spraying pressure and the dust removal effect when the connecting rod moves downwards to drive the sleeve block to rotate, the sleeve block rotates to open the pressure increasing valve, and high-pressure water enters the spraying head and the nozzle.

Description

Technical Field

[0001] This invention belongs to the field of dust suppression spraying, specifically relating to an environmentally friendly dust suppression spraying device for building construction. Background Technology

[0002] Construction waste is transported by dump trucks at construction sites. These trucks generate a lot of dust as they move, so the surrounding environment needs to be sprayed with water to prevent dust during construction.

[0003] Patent publication number CN222752854U relates to a dust suppression device for building construction, belonging to the field of dust suppression equipment technology. It aims to solve the technical problem that a large amount of dust generated during the loading of earthwork into truck beds during civil construction can spread within the construction area, affecting construction operations. This dust suppression device includes a base and fixed arms vertically fixed to both ends of the top of the base. During the loading of earthwork into dump trucks, the water mist sprayed by this device can immediately suppress the dust generated during loading. Compared to traditional methods of spraying dust around the perimeter of the construction area, this method, which sprays dust from one side of the dump truck, prevents further spread of the dust, achieving a higher dust suppression effect. It also features adjustable spray height and angle, offering high flexibility and allowing for optimal dust suppression according to the earthwork loading requirements.

[0004] Existing technologies also have the function of dust suppression for dump trucks. However, since dust suppression is also required inside construction sites, setting up dedicated dust suppression systems for dump trucks would be a waste of spraying equipment. It is difficult to adjust the spraying equipment to suppress dust when the dump trucks move to the construction site entrance. At the same time, a large amount of mud and sand will be attached to the surface of the dump trucks. Simple spraying cannot remove the mud and sand from the surface of the dump trucks. The adhered mud and sand will increase dust both inside and outside the construction site. Insufficient spraying and washing time for dump trucks will also fail to achieve the desired dust suppression and prevention effects. Summary of the Invention

[0005] Various embodiments of the disclosed technology relate to an environmentally friendly construction dust suppression spray device that can improve dust suppression within construction sites and reduce dust generated by dump trucks within construction sites.

[0006] According to the disclosed embodiments, an environmentally friendly dust suppression spraying device for building construction includes: a fixed channel, a speed bump slidably installed at the bottom of the fixed channel, a fixed frame fixedly installed at the top of the fixed channel, a rotating shaft rotatably passing through the inside of the fixed frame, an mounting frame fixedly installed on the circumferential surface of the rotating shaft, and a spray head fixedly installed on the circumferential surface of the mounting frame. A connecting rod is fixedly installed on the top of the speed bump, and a nozzle is fixedly installed on the top of the mounting frame. A knob is installed on the surface of the nozzle to control the spraying mode. A guide plate is fixedly installed on the surface of the mounting frame, and a telescopic frame is fixedly installed on the circumference of the rotating shaft. The free end of the telescopic frame is rotatably connected to the top of the connecting rod. When the connecting rod moves downward, it pulls the telescopic frame to rotate downward. When the telescopic frame rotates downward, it drives the rotating shaft to rotate. The rotation of the rotating shaft drives the mounting frame to rotate in the direction of the dump truck.

[0007] A connecting pipe is fixedly installed inside the fixed channel. A pressure boosting valve is installed on the surface of the connecting pipe. A slide rod is fixedly installed at the bottom of the control end of the pressure boosting valve. A spiral groove is opened on the circumferential surface of the slide rod. A sleeve block is slidably installed inside the spiral groove. The sleeve block is fixedly connected to the connecting rod through a bracket. When the connecting rod moves downward, it drives the sleeve block to move downward through the bracket. When the sleeve block moves downward, it slides inside the spiral groove, causing the sleeve block to drive the slide rod and the control end of the pressure boosting valve to rotate.

[0008] In some implementations, a support spring is provided between the speed bump and the fixed channel. The support spring is used to support the speed bump and drive it to reset. The knob is in contact with the guide plate, so that when the knob moves, the guide plate can drive the knob to rotate. The guide plate is used to drive the knob to rotate. The connecting pipe is connected to the spray head and the nozzle respectively.

[0009] In some implementations, the surface of the fixed channel is provided with a limiting device, which includes a support frame. The support frame is fixedly installed on the right side of the fixed channel. A railing is rotatably installed inside the support frame. A pushing block is slidably installed on the surface of the support frame. A telescopic block is fixedly installed on the right side of the rotating shaft. The bottom of the telescopic block is rotatably connected to the top of the pushing block. A cylindrical block is slidably installed on the left side of the inner wall of the railing. A first spring is provided between the cylindrical block and the railing. The elastic force of the first spring can drive the cylindrical block to return to its original position. When the rotating shaft rotates, it will drive the telescopic block to rotate. The rotation of the telescopic block will drive the pushing block to slide towards the cylindrical block, and the pushing block will contact the cylindrical block.

[0010] In some implementations, a control component is installed at the top of the railing, which is connected to the interior of the left side of the railing. The control component includes an exhaust port and a one-way valve. The one-way valve allows outside air to enter the interior of the railing, and the exhaust port has a small diameter so that the air inside the railing can only be slowly discharged.

[0011] In some implementations, a torsion spring is provided between the railing and the support frame, which can drive the railing to reset. The side of the push block closest to the cylindrical block is set to be arc-shaped.

[0012] In some implementations, a recycling device is provided on the surface of the fixed channel. The recycling device includes a collection trough, which is opened on the surface of the fixed channel. A mudguard is slidably installed on the surface of the fixed channel. A pressing frame is fixedly installed on the circumferential surface of the connecting rod. A roller is installed at the bottom of the pressing frame. When the connecting rod moves downward, it will drive the pressing frame to move downward. When the pressing frame moves downward, it will drive the roller to move downward.

[0013] In some implementations, an inclined panel is fixedly installed on the inner wall of the collection trough, and a trapezoidal block is slidably installed on the side of the inner wall of the collection trough away from the inclined panel. An elastic telescopic rod is hinged to the top of the trapezoidal block, and the top of the elastic telescopic rod is hinged to a mudguard. A flushing pipe is fixedly installed inside the fixed channel, and the flushing pipe communicates with the inside of the collection trough. When the mudguard moves, it will drive the top of the elastic telescopic rod to move. The movement of the top of the elastic telescopic rod will cause the bottom of the elastic telescopic rod to push the trapezoidal block downward.

[0014] In some implementations, a second spring is provided between the mudguard and the fixed channel. The elastic force of the second spring will cause the mudguard to reset. The flushing pipe is connected to the inside of the collection tank. A sewage pipe is fixedly installed inside the fixed channel. The sewage pipe is connected to the inside of the collection tank. The sewage pipe is positioned higher than the trapezoidal block. The sewage pipe is used to discharge excess sewage from the inside of the collection tank.

[0015] This invention provides an environmentally friendly dust suppression spray device for building construction. It has the following beneficial effects: 1. This invention utilizes spray heads and nozzles to continuously suppress dust inside construction sites. When a dump truck travels onto a fixed path, it presses down on a speed bump, causing the connecting rod to pull the mounting frame, spray heads, and nozzles towards the truck. This allows the spray heads to spray water onto the top of the truck, effectively removing dust. As the nozzles rotate, a guide plate rotates a knob, switching the spray mode to spray umbrella-shaped water jets onto the truck body, preventing dust from being carried into or out of the construction site and reducing the impact of dump trucks. This also improves dust control during construction. The downward movement of the connecting rod rotates a sleeve block, opening a pressure valve to allow high-pressure water to enter the spray heads and nozzles, increasing the spray pressure and enhancing dust removal. Normal dust control involves low-pressure, slow spraying, with increased pressure only applied when a dump truck passes by, improving practicality and reducing water waste.

[0016] 2. In this invention, when the connecting rod moves downward to rotate the rotating shaft, the rotation of the connecting rod will drive the pushing block to move. The movement of the pushing block will drive the cylindrical block and the railing to rotate. The railing can block the dump truck, forcing the dump truck to be sprayed with dust prevention spraying inside the fixed channel for a certain period of time. Otherwise, the dump truck will not achieve the dust prevention spraying effect if it passes through the fixed channel directly and quickly. When the pushing block drives the cylindrical block to rotate, the cylindrical block will gradually move inward to the inside of the railing, allowing the railing to slowly reset. This eliminates the need for manual or intelligent equipment to control the opening of the railing, allowing the dump truck to be sprayed with dust prevention spraying for a sufficient period of time.

[0017] 3. This invention allows for the recycling of sprayed wastewater through a collection tank. The mudguard blocks impurities in the wastewater, preventing them from entering the collection tank and becoming difficult to clean. Simultaneously, when the connecting rod moves downward, the rollers on the pressing frame push the mudguard away from the collection tank, preventing impurities from accumulating in the same position and affecting the filtration effect of the mudguard. The movement of the mudguard causes the elastic telescopic rod to push the trapezoidal block downward, which causes the wastewater inside the collection tank to be sprayed out through the flushing pipe. The flushing pipe washes the bottom and tires of the dump truck, reducing the impact of the bottom and tires of the dump truck on dust prevention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the overall structure of an exemplary embodiment of the disclosed technology; Figure 2 This is a schematic diagram illustrating the position of the rotating shaft and the mounting bracket in an exemplary embodiment according to the disclosed technology; Figure 3 This is a schematic diagram illustrating the position of the rotating shaft and the telescopic frame in an exemplary embodiment according to the disclosed technology; Figure 4 This is a schematic diagram illustrating the positions of the mounting bracket and guide plate in an exemplary embodiment according to the disclosed technology; Figure 5 This illustrates exemplary embodiments based on the disclosed technology. Figure 3 Enlarged diagram of part A in the middle; Figure 6 This is a schematic diagram illustrating the positions of the rotating shaft and the telescopic block in an exemplary embodiment according to the disclosed technology; Figure 7 This is a schematic diagram illustrating the positions of railings and cylindrical blocks in an exemplary embodiment of the disclosed technology; Figure 8 This is a schematic diagram of a railing cross-section according to an exemplary embodiment of the disclosed technology; Figure 9 This is a schematic diagram illustrating the fixed channel and mudguard positions in an exemplary embodiment according to the disclosed technology; Figure 10 This illustrates exemplary embodiments based on the disclosed technology. Figure 9 Enlarged schematic diagram of part B in the middle.

[0019] Figure label: 1. Fixed channel; 2. Fixed frame; 3. Rotating shaft; 4. Mounting frame; 5. Spray head; 6. Speed ​​bump; 71. Connecting rod; 72. Connecting pipe; 73. Pressure booster valve; 74. Sliding rod; 75. Sleeve block; 76. Spray head; 77. Knob; 78. Guide plate; 79. Telescopic frame; 81. Support frame; 82. Railing; 83. Telescopic block; 84. Pushing block; 85. Cylindrical block; 86. Control component; 91. Mudguard; 92. Pressing frame; 93. Trapezoidal block; 94. Elastic telescopic rod; 95. Flushing pipe; 96. Sloping panel; 97. Drain pipe. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0021] Please see Figure 1 - Figure 10 One embodiment of the present invention is: an environmentally friendly construction dust suppression spraying device, including a fixed channel 1, a speed reduction belt 6 slidably installed at the bottom of the fixed channel 1, a fixed frame 2 fixedly installed at the top of the fixed channel 1, a rotating shaft 3 rotatably passing through the inside of the fixed frame 2, an mounting frame 4 fixedly installed on the circumferential surface of the rotating shaft 3, and a spray head 5 fixedly installed on the circumferential surface of the mounting frame 4. A connecting rod 71 is fixedly installed on the top of the speed bump 6, and a nozzle 76 is fixedly installed on the top of the mounting frame 4. A knob 77 is installed on the surface of the nozzle 76. The knob 77 is used to control the spraying mode of the nozzle 76. A guide plate 78 is fixedly installed on the surface of the mounting frame 2. A telescopic frame 79 is fixedly installed on the circumferential surface of the rotating shaft 3. The free end of the telescopic frame 79 is rotatably connected to the top of the connecting rod 71 to switch the spraying mode of the nozzle 76, so that the nozzle 76 sprays an umbrella-shaped water column to wash the body of the dump truck. A connecting pipe 72 is fixedly installed inside the fixed channel 1. A pressure boosting valve 73 is installed on the surface of the connecting pipe 72. A slide rod 74 is fixedly installed at the bottom of the control end of the pressure boosting valve 73. A spiral groove is opened on the circumferential surface of the slide rod 74. A sleeve block 75 is slidably installed inside the spiral groove. The sleeve block 75 is fixedly connected to the connecting rod 71 through a bracket, which increases the spraying pressure and improves the dust removal effect. Normal building dust suppression is carried out by low-pressure slow spraying. The pressure is only increased when a muck truck passes by.

[0022] A support spring is provided between the speed bump 6 and the fixed channel 1. The support spring is used to support the speed bump 6 and drive the speed bump 6 to reset. The knob 77 is in contact with the guide plate 78, so that when the knob 77 moves, the guide plate 78 can drive the knob 77 to rotate. The guide plate 78 is used to drive the knob 77 to rotate. The connecting pipe 72 is connected to the spray head 5 and the spray head 76 respectively.

[0023] In this embodiment, during operation: when the dump truck enters the fixed passage 1 from the left, it will press down on the speed bump 6 and move downwards. The downward movement of the speed bump 6 will cause the connecting rod 71 to move downwards. The downward movement of the connecting rod 71 will pull the telescopic frame 79 to rotate downwards. The downward rotation of the telescopic frame 79 will cause the rotating shaft 3 to rotate. The rotation of the rotating shaft 3 will cause the mounting frame 4 to rotate towards the dump truck. The rotation of the mounting frame 4 will cause the spray head 5 and spray head 76 to rotate towards the dump truck. The rotation of the spray head 76 will cause the knob to rotate. 77 contacts the guide plate 78, causing the guide plate 78 to push the knob 77 to rotate. Rotating the knob 77 switches the spraying mode of the nozzle 76, causing the nozzle 76 to spray an umbrella-shaped water column to wash the dump truck. When the connecting rod 71 moves downward, it drives the sleeve block 75 to move downward through the bracket. When the sleeve block 75 moves downward, it slides inside the spiral groove, causing the sleeve block 75 to drive the slide rod 74 and the control end of the pressure booster valve 73 to rotate, thereby opening the pressure booster valve 73, allowing high-pressure water to enter the spray head 5 and spray out from the nozzle 76.

[0024] Please see Figure 1 - Figure 10 Based on the above embodiments, in another embodiment of the present invention, a limiting device is provided on the surface of the fixed channel 1. The limiting device includes a support frame 81, which is fixedly installed on the right side of the fixed channel 1. A railing 82 is rotatably installed inside the support frame 81. A pushing block 84 is slidably installed on the surface of the support frame 81. A telescopic block 83 is fixedly installed on the right side of the rotating shaft 3. The bottom of the telescopic block 83 is rotatably connected to the top of the pushing block 84. A cylindrical block 85 is slidably installed on the left side of the inner wall of the railing 82. A first spring is provided between the cylindrical block 85 and the railing 82. The elastic force of the first spring can drive the cylindrical block 85 to reset, so that the dump truck must be sprayed with dust prevention spray inside the fixed channel 1 for a certain period of time. Otherwise, the dump truck can not achieve the dust prevention spray effect by directly and quickly passing through the fixed channel 1.

[0025] A control component 86 is installed on the top of the railing 82. The control component 86 is connected to the interior of the left side of the railing 82. The control component 86 includes an exhaust port and a one-way valve. The one-way valve can only allow outside air to enter the interior of the railing 82. The exhaust port has a small diameter, so that the air inside the railing 82 can only be slowly discharged.

[0026] A torsion spring is provided between the railing 82 and the support frame 81. The torsion spring can drive the railing 82 to reset. The side of the push block 84 near the cylindrical block 85 is set in an arc shape.

[0027] A recycling device is provided on the surface of the fixed channel 1. The recycling device includes a collection tank, which is opened on the surface of the fixed channel 1. A mudguard 91 is slidably installed on the surface of the fixed channel 1. A pressing frame 92 is fixedly installed on the circumferential surface of the connecting rod 71. A roller is installed at the bottom of the pressing frame 92. When the connecting rod 71 moves downward, the roller on the pressing frame 92 will push the mudguard 91 to move away from the collection tank, so as to avoid impurities accumulating in the same position and affecting the filtration effect of the mudguard 91.

[0028] An inclined panel 96 is fixedly installed on the inner wall of the collection trough. A trapezoidal block 93 is slidably installed on the side of the inner wall of the collection trough away from the inclined panel 96. An elastic telescopic rod 94 is hinged to the top of the trapezoidal block 93. The top of the elastic telescopic rod 94 is hinged to the mudguard 91. A flushing pipe 95 is fixedly installed inside the fixed channel 1. The flushing pipe 95 is connected to the inside of the collection trough. The wastewater inside the collection trough is sprayed out from the flushing pipe 95 by the trapezoidal block 93, and the bottom and tires of the dump truck are washed through the flushing pipe 95.

[0029] A second spring is installed between the mudguard 91 and the fixed channel 1. The elastic force of the second spring will drive the mudguard 91 to reset. The flushing pipe 95 is connected to the inside of the collection tank. A sewage pipe 97 is fixedly installed inside the fixed channel 1. The sewage pipe 97 is connected to the inside of the collection tank. The position of the sewage pipe 97 is higher than that of the trapezoidal block 93. The sewage pipe 97 is used to discharge excess sewage from the inside of the collection tank.

[0030] In this embodiment, when the rotating shaft 3 rotates, it drives the telescopic block 83 to rotate. The rotation of the telescopic block 83 drives the pushing block 84 to slide towards the cylindrical block 85. The pushing block 84 will contact the cylindrical block 85, causing the pushing block 84 to push the cylindrical block 85 and the railing 82 to rotate. The rotation of the railing 82 will block the driving direction of the dump truck. When the pushing block 84 pushes the cylindrical block 85, it will squeeze the cylindrical block 85 to move inward into the railing 82. When the cylindrical block 85 moves inward into the railing 82, it will squeeze the gas inside the railing 82 to slowly be discharged from the exhaust port. Because the gas inside the railing 82 is slowly discharged, it will limit the movement speed of the cylindrical block 85 inward into the railing 82. As the cylindrical block 85 slowly moves inward into the railing 82, it will gradually break away from the contact with the pushing block 84, so that the elastic force of the torsion spring will drive the railing 82 to slowly return to its original position, so that the railing 82 will automatically release the obstruction of the dump truck, and the dump truck will maintain sufficient spraying time. When the connecting rod 71 moves downward, it will drive the pressing frame 92 to move downward. The downward movement of the pressing frame 92 will drive the roller to move downward. When the roller moves downward, it will contact the mudguard 91, causing the arc surface of the roller to push the mudguard 91 to slide towards the dump truck. The mudguard 91 will prevent the mud and sand in the sewage from entering the interior of the collection tank. The collection tank will collect the sewage. When the mudguard 91 moves, it will drive the top of the elastic telescopic rod 94 to move. The movement of the top of the elastic telescopic rod 94 will cause the bottom of the elastic telescopic rod 94 to push the trapezoidal block 93 downward. The downward movement of the trapezoidal block 93 will squeeze the sewage inside the collection tank and spray it out from the flushing pipe 95. The sprayed sewage can be recycled to wash the bottom and tires of the dump truck. The sewage above the trapezoidal block 93 will be discharged from the drain pipe 97 to prevent sewage from overflowing the collection tank.

[0031] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. An environmentally friendly dust suppression spraying device for building construction, comprising a fixed channel (1), wherein a speed reduction belt (6) is slidably installed at the bottom of the fixed channel (1), characterized in that, A fixed frame (2) is fixedly installed on the top of the fixed channel (1). A rotating shaft (3) is rotatably passed through the inside of the fixed frame (2). A mounting frame (4) is fixedly installed on the circumferential surface of the rotating shaft (3). A spray head (5) is fixedly installed on the circumferential surface of the mounting frame (4). A connecting rod (71) is fixedly installed on the top of the speed bump (6), a nozzle (76) is fixedly installed on the top of the mounting bracket (4), a knob (77) is installed on the surface of the nozzle (76), the knob (77) is used to control the spraying mode of the nozzle (76), a guide plate (78) is fixedly installed on the surface of the mounting bracket (2), and a telescopic frame (79) is fixedly installed on the circumferential surface of the rotating shaft (3). The free end of the telescopic frame (79) is rotatably connected to the top of the connecting rod (71). A connecting pipe (72) is fixedly installed inside the fixed channel (1). A pressure boosting valve (73) is installed on the surface of the connecting pipe (72). A slide rod (74) is fixedly installed at the bottom of the control end of the pressure boosting valve (73). A spiral groove is opened on the circumferential surface of the slide rod (74). A sleeve block (75) is slidably installed inside the spiral groove. The sleeve block (75) is fixedly connected to the connecting rod (71) through a bracket.

2. The environmentally friendly dust suppression spraying device for building construction according to claim 1, characterized in that, A support spring is provided between the speed bump (6) and the fixed channel (1). The knob (77) is in contact with the guide plate (78). The guide plate (78) is used to drive the knob (77) to rotate. The connecting pipe (72) is connected to the spray head (5) and the nozzle (76) respectively.

3. The environmentally friendly dust suppression spraying device for building construction according to claim 2, characterized in that, The surface of the fixed channel (1) is provided with a limiting device, which includes a support frame (81). The support frame (81) is fixedly installed on the right side of the fixed channel (1). A railing (82) is rotatably installed inside the support frame (81). A push block (84) is slidably installed on the surface of the support frame (81). A telescopic block (83) is fixedly installed on the right side of the rotating shaft (3). The bottom of the telescopic block (83) is rotatably connected to the top of the push block (84). A cylindrical block (85) is slidably installed on the left side of the inner wall of the railing (82). A first spring is provided between the cylindrical block (85) and the railing (82).

4. The environmentally friendly dust suppression spraying device for building construction according to claim 3, characterized in that, A control component (86) is installed on the top of the railing (82). The control component (86) is connected to the interior of the left side of the railing (82). The control component (86) includes an exhaust port and a one-way valve.

5. The environmentally friendly dust suppression spraying device for building construction according to claim 4, characterized in that, A torsion spring is provided between the railing (82) and the support frame (81), and the push block (84) is arc-shaped on the side near the cylindrical block (85).

6. The environmentally friendly dust suppression spraying device for building construction according to claim 5, characterized in that, The surface of the fixed channel (1) is provided with a recycling device, which includes a collection trough. The collection trough is opened on the surface of the fixed channel (1). A mudguard (91) is slidably installed on the surface of the fixed channel (1). A pressing frame (92) is fixedly installed on the circumferential surface of the connecting rod (71). A roller is installed at the bottom of the pressing frame (92).

7. The environmentally friendly dust suppression spraying device for building construction according to claim 6, characterized in that, An inclined plate (96) is fixedly installed on the inner wall of the collection tank. A trapezoidal block (93) is slidably installed on the side of the inner wall of the collection tank away from the inclined plate (96). An elastic telescopic rod (94) is hinged to the top of the trapezoidal block (93). The top of the elastic telescopic rod (94) is hinged to the mudguard (91). A flushing pipe (95) is fixedly installed inside the fixed channel (1). The flushing pipe (95) communicates with the inside of the collection tank.

8. The environmentally friendly dust suppression spraying device for building construction according to claim 7, characterized in that, A second spring is provided between the mudguard (91) and the fixed channel (1). The flushing pipe (95) is connected to the inside of the collection tank. A sewage pipe (97) is fixedly installed inside the fixed channel (1). The sewage pipe (97) is connected to the inside of the collection tank. The position of the sewage pipe (97) is higher than that of the trapezoidal block (93).

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