Transportation trolley for building construction

Abstract

The invention provides a transport trolley for building construction, and belongs to the technical field of building construction, the transport trolley for building construction comprises a trolley body for transport, and a jacking assembly is arranged on the trolley body, and solves the problems that when the transport trolley is widely applied to a construction site to carry construction stand columns, the transport trolley is inconvenient to use, time-consuming and labor-consuming, and the construction stand columns are inconvenient to carry. The problems of low safety and low practicability are solved, meanwhile, the problem that the vehicle body is prone to toppling over is solved, use by workers is facilitated, the labor intensity of the workers is reduced, and the construction efficiency is further improved.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a transport trolley for building construction. Background Technology

[0002] Transport trolleys used in construction are an indispensable means of transportation. In recent years, with the development of the times, there are more and more construction sites, and the use of transport trolleys is also increasing. Currently, when transport trolleys are widely used on construction sites to move construction columns, they are inconvenient to use, time-consuming and labor-intensive, have poor safety and practicality, and are even prone to tipping over, seriously affecting construction efficiency. Therefore, a new type of transport trolley for construction is needed to solve this problem. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides a construction transport trolley, including a transport vehicle body, wherein the vehicle body is provided with a lifting assembly.

[0004] Furthermore, the vehicle body includes a base, and a first horizontal connecting rod is provided at both the front and rear ends of the left side of the base. The right end of the first connecting rod is fixedly connected to the base, and a second connecting rod is provided between the two first connecting rods. The two ends of the second connecting rod are respectively fixedly connected to the left ends of the two first connecting rods.

[0005] A longitudinal shaft is horizontally provided below the first connecting rod. Wheels are fixedly sleeved at both ends of the shaft. A sleeve is rotatably sleeved between the two wheels. Connecting blocks are fixedly connected to both ends of the upper side of the sleeve. The two connecting blocks are respectively fixedly connected to the bottom of the two first connecting rods.

[0006] Two omnidirectional wheels, one in front of the other, are installed on the lower right side of the base. Horizontal first crossbars are fixedly connected to both the front and rear sides of the upper surface of the base. A vertical fixed rod is fixedly connected to the upper surface of the rear first crossbar. A horizontal third connecting rod is fixedly connected to the upper end of the fixed rod. A handle and a control area for controlling the lifting assembly are provided on the base.

[0007] Furthermore, the lifting assembly includes two second crossbars located between two first crossbars. The second crossbars are arranged parallel to the first crossbars. The length of the second crossbar is greater than the length of the first crossbar. The second crossbar is hinged to the right side of the base through a first hinge. A vertical support plate is fixedly connected to the right end of the two second crossbars.

[0008] A first longitudinal bar is horizontally provided between the two second crossbars. The first longitudinal bar is located to the left of the second connecting bar, and both ends of the first longitudinal bar are fixedly connected to the two second crossbars respectively.

[0009] A first horizontally penetrating placement groove is formed in the middle of the upper surface of the base, and a protective plate is installed on the right side of the base at the first placement groove. A second horizontally penetrating placement groove is formed vertically in the middle of the upper surface of the second connecting rod. A cylinder is hinged in the first placement groove, and the output end of the cylinder rests in the second placement groove. The output end of the cylinder is hinged to the middle of the right side of the first vertical rod through a second hinge. The depth of the first placement groove is greater than the depth of the second placement groove, and the cylinder is tilted with the left side higher than the right side.

[0010] Furthermore, the control area includes a placement box composed of connecting plates, which is fixedly connected to the right end of the third connecting rod. The placement box is divided into two areas, with the handle fixed in one area and a switch controller for controlling the cylinder placed in the other area.

[0011] Furthermore, a first longitudinal roller is horizontally mounted on the right side of the upper surface of the base, and second rollers parallel to the first roller are mounted at both ends of the upper surface of the second connecting rod.

[0012] Furthermore, a second longitudinal bar is horizontally provided at the left end of each of the two second crossbars, and a third roller is installed on the left side of the second longitudinal bar.

[0013] Furthermore, an automatic balancing assembly is provided at the left end of each of the two first crossbars. The automatic balancing assembly includes an electric push rod that is vertically fixed to the left end of the first crossbar. An auxiliary wheel is fixedly connected to the lower end of the electric push rod. The lowest point of the auxiliary wheel is higher than the lowest point of the wheel. The wheel is flush with the omnidirectional wheel.

[0014] A housing with a semi-circular vertical cross-section is provided between the electric push rod and the wheel. The horizontal side of the housing is fixed to the first crossbar. The housing is provided with an arc-shaped partition. The housing is divided into a semi-circular first cavity and a semi-annular second cavity by the partition. The second cavity is located outside the first cavity.

[0015] A signal sensor is fixedly installed in the first cavity, a metal ball is provided in the second cavity, and a plurality of mounting slots are provided on the partition plate, with the plurality of mounting slots arranged sequentially along the left circumference of the partition plate.

[0016] It also includes a first guide plate and a second guide plate. The first guide plate is located in the second cavity. One end of the first guide plate is snapped into one of the mounting slots. The other end of the first guide plate is fixed to the inner bottom wall of the housing. A first pressure sensor is provided on the side of the first guide plate near the metal ball.

[0017] The second guide plate is fixed at the bottom of the second cavity and located on the right side of the metal ball. A second pressure sensor is provided on the side of the second guide plate near the metal ball. The signal sensor is electrically connected to the electric push rod, the first pressure sensor, and the second pressure sensor, respectively.

[0018] Furthermore, the first crossbar is equipped with an infrared transmitter and receiver for a tracking trolley system, used to sense the black and white lines laid out at the construction site.

[0019] The advantages of this invention are: This invention provides a construction transport trolley, which solves the problems of inconvenience, time and labor costs, poor safety and practicality when transport trolleys are widely used on construction sites to move construction columns. At the same time, it also avoids the problem of the vehicle body being easy to tip over, thus making it easier for workers to use. This not only reduces the labor intensity of workers, but also further improves construction efficiency.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a first schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a second schematic diagram of the structure of the present invention.

[0023] Figure 3 This is a top view of the structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure in use of the present invention.

[0025] Figure 5 This is the main view of the structure of the present invention.

[0026] Figure 6 This is an enlarged view of the internal structure at point A of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Vehicle body; 101. Base; 102. First connecting rod; 103. Second connecting rod; 104. Axle; 105. Wheel; 106. Sleeve; 107. Connecting block; 108. Caster wheel; 109. First crossbar; 110. Fixing rod; 111. Third connecting rod; 112. Handle; 2. Lifting assembly; 201. Second crossbar; 202. Support plate; 203. First longitudinal bar; 204. First placement slot; 205. Protective plate; 206. Second placement slot; 20 7. Cylinder; 208. First roller; 209. Second roller; 210. Second longitudinal rod; 211. Third roller; 212. First hinge; 213. Second hinge; 3. Control area; 31. Placement box; 4. Switch controller; 5. Automatic balancing assembly; 51. Electric push rod; 52. Auxiliary wheel; 53. Housing; 54. First cavity; 55. Second cavity; 56. Signal sensor; 57. Metal ball; 58. Mounting slot; 59. First guide plate; 510. Second guide plate. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the specific implementation methods, structural features and effects of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "aligned", "overlapping", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] Example 1

[0033] This embodiment provides, for example Figures 1-6 The diagram shows a construction transport trolley, including a transport vehicle body 1. The vehicle body 1 includes a base 101. A first connecting rod 102 is horizontally arranged at both the front and rear ends of the left side of the base 101. The right end of the first connecting rod 102 is fixedly connected to the base 101. A second connecting rod 103 is arranged between the two first connecting rods 102, and both ends of the second connecting rod 103 are fixedly connected to the left ends of the two first connecting rods 102 respectively. A longitudinal axle 104 is horizontally arranged below the first connecting rods 102. Wheels 105 are fixedly fitted at both the front and rear ends of the axle 104. A sleeve 106 is rotatably mounted between two wheels 105. Connecting blocks 107 are fixedly connected to both the front and rear ends of the upper side of the sleeve 106. The two connecting blocks 107 are fixedly connected to the bottom of the two first connecting rods 102 respectively. Two universal wheels 108 are installed on the lower right side of the base 101, one in front and one behind. Horizontal first crossbars 109 are fixedly connected to both the front and rear sides of the upper surface of the base 101. A vertical fixing rod 110 is fixedly connected to the upper surface of the rear first crossbar 109. A horizontal third connecting rod 111 is fixedly connected to the upper end of the fixing rod 110.

[0034] A lifting assembly 2 is provided on the vehicle body 1. A handle 112 and a control area 3 for controlling the lifting assembly 2 are provided at the right end of the third connecting rod 111. The lifting assembly 2 is mounted on the base 101 and includes two second crossbars 201 located between two first crossbars 109. The second crossbars 201 and the first crossbars 109 are parallel to each other, and the length of the second crossbars 201 is greater than the length of the first crossbars 109. The second crossbars 201 are hinged to the right side of the base 101 via a first hinge 212. A vertical support plate 202 is fixedly connected to the right end of the two second crossbars 201. A longitudinal first rod 203 is horizontally arranged between the two second crossbars 201, located to the left of the second connecting rod 103. The second connecting rod 103 is located between the two second crossbars 201. The first vertical rod 203 is fixedly connected to two second horizontal rods 201 at both ends; a first horizontally penetrating placement groove 204 is opened in the middle of the upper surface of the base 101, and a protective plate 205 is installed on the right side of the base 101 at the first placement groove 204; a second horizontally penetrating placement groove 206 is opened vertically in the middle of the upper surface of the second connecting rod 103; a cylinder 207 is hinged in the first placement groove 204; the cylinder 207 can also be replaced by a hydraulic cylinder; the output end of the cylinder 207 is placed in the second placement groove 206; and the output end of the cylinder 207 is hinged to the middle of the right side of the first vertical rod 203 through the second hinge 213; the depth of the first placement groove 204 is greater than the depth of the second placement groove 206; the cylinder 207 is tilted with the left side higher than the right side; and the control area 3 is electrically connected to the cylinder 207.

[0035] The control area 3 includes a placement box 31 consisting of a connecting plate. The placement box 31 is fixedly connected to the right end of the third link 111. The placement box 31 is divided into two areas. The handle 112 is fixed in one area, and the switch controller 4 for controlling the cylinder 207 is placed in the other area.

[0036] In use, first move the trolley to the designated position, then place the construction column to be moved horizontally on the trolley body 1. The operator controls the movement of the output end of cylinder 207 by activating switch controller 4. The output end of cylinder 207 is hinged to the first vertical rod 203 via the second hinge 213, causing the first vertical rod 203 to rotate. The first vertical rod 203 drives the second horizontal rod 201 and the second vertical rod 210, rotating around the hinge point between the second horizontal rod 201 and the first hinge 212 on the base 101. Simultaneously, the cylinder body of cylinder 207 is hinged within the first placement slot 204 of the base 101, causing the output end of cylinder 207 to drive the first vertical rod 203 to rotate. The output end of cylinder 207 rotates around the hinge point between the cylinder body of cylinder 207 and the base 101. When cylinder 207 drives the second horizontal rod 201, the first vertical rod 203, and the second vertical rod 210 to rotate 25°-45°... When the angle is 30° (preferably 30°), the construction column on the vehicle body 1 moves towards the support plate 202 by tilting at the angle and direction until the construction column abuts against the support plate 202. Then, the worker controls the handle 112 with one hand and pushes the support plate 202 with the other hand to move the trolley to the designated location. Then, the switch controller 4 controls the output end of the cylinder 207 to retract, so that the cylinder 207 moves in the reverse direction of the above method to restore the second crossbar 201, the first longitudinal bar 203 and the second longitudinal bar 210, and the support plate 202 to their original positions. Finally, the construction column is unloaded, thus completing the transportation and handling of the construction column by the transport trolley. This solves the problems of inconvenience, time-consuming and labor-intensive use, poor safety and practicality of transport trolleys when they are widely used to transport construction columns on construction sites. This makes it easier for workers to use, reduces the labor intensity of workers, and improves construction efficiency.

[0037] Furthermore, a longitudinal first roller 208 is horizontally mounted on the right side of the upper surface of the base 101, and a second roller 209 parallel to the first roller 208 is mounted at both ends of the upper surface of the second connecting rod 103. The first roller 208 and the second roller 209 do not interfere with the movement trajectory of the cylinder 207. When the second horizontal rod 201, the first vertical rod 203 and the second vertical rod 210 are kept in a horizontal state, the highest point of the first roller 208 and the second roller 209 is higher than the highest point of the second horizontal rod 201, the first vertical rod 203 and the second vertical rod 210.

[0038] With the first roller 208 and the second roller 209 in place, when the trolley transports the construction column to the designated location for unloading, the second horizontal bar 201, the first vertical bar 203, and the second vertical bar 210 return to their original positions to keep them horizontal. Then, the bottom of the construction column contacts the first roller 208 and the second roller 209, making it easier for workers to unload the construction column from the trolley. This reduces the labor intensity of the workers and further improves work efficiency.

[0039] Furthermore, a second longitudinal bar 210 is horizontally provided at the left end of the two second crossbars 201, and a third roller 211 is installed on the left side of the second longitudinal bar 210.

[0040] By using the third roller 211, a gap with an inclined angle is created between the construction column and the second horizontal bar 201, the first vertical bar 203, and the second vertical bar 210, preventing them from being in complete contact. This allows the construction column on the vehicle body 1 to move more easily and effortlessly towards the support plate 202 via the third roller 211 after the cylinder 207 rotates the second horizontal bar 201, the first vertical bar 203, and the second vertical bar 210 to a specific position. This facilitates use by workers, reduces their labor intensity, and further improves work efficiency.

[0041] Furthermore, an automatic balancing assembly 5 is provided at the left end of each of the two first crossbars 109. The automatic balancing assembly 5 includes an electric push rod 51 that is vertically fixed to the left end of the first crossbar 109. An auxiliary wheel 52 is fixedly connected to the lower end of the electric push rod 51. The lowest point of the auxiliary wheel 52 is higher than the lowest point of the wheel 105. The wheel 105 is flush with the universal wheel 108.

[0042] A housing 53 with a semi-circular vertical cross section is provided between the electric push rod 51 and the wheel 105. The horizontal side of the housing 53 is fixed on the first cross rod 109. The housing 53 is provided with an arc-shaped partition. The housing 53 is divided into a semi-circular first cavity 54 and a semi-annular second cavity 55 by the partition. The second cavity 55 is located outside the first cavity 54.

[0043] A signal sensor 56 is fixedly installed in the first cavity 54, a metal ball 57 is provided in the second cavity 55, and a number of mounting slots 58 are provided on the partition plate, with the mounting slots 58 arranged sequentially along the left circumference of the partition plate.

[0044] It also includes a first guide plate 59 and a second guide plate 510. The first guide plate 59 is located in the second cavity 55. One end of the first guide plate 59 is snapped into one of the mounting slots 58, and the other end of the first guide plate 59 is fixed to the inner bottom wall of the housing 53. A first pressure sensor is provided on the side of the first guide plate 59 near the metal ball 57.

[0045] The second guide plate 510 is fixed at the bottom of the second cavity 55 and located on the right side of the metal ball 57. A second pressure sensor is provided on the side of the second guide plate 510 near the metal ball 57. The signal sensor 56 is electrically connected to the electric push rod 51, the first pressure sensor, and the second pressure sensor, respectively.

[0046] Through the cooperation of the electric push rod 51 and the auxiliary wheel 52, when the second horizontal bar 201, the first vertical bar 203, and the second vertical bar 210 rotate upward with the construction column, and the transport trolley tilts to the left (i.e., in the direction of the front of the vehicle) due to the excessive length of the construction column, the first horizontal bar 109 of the transport trolley tilts to the left under the weight of the construction column. During the tilting process, the first horizontal bar 109 will drive the housing 53 to rotate, and the metal ball 57 inside the housing 53 will roll in the second cavity 55 until it collides with the first pressure sensor on the first guide plate 59. Then, the first pressure sensor will send a signal to the signal sensor 56, causing the signal to be transmitted... Sensor 56 controls the extension of electric push rod 51 to move the left end of the first crossbar 109 upward until the metal ball 57 inside the housing 53 separates from the first guide plate 59 and touches the second guide plate 510. Then the extension stops, keeping the transport trolley balanced and preventing the trolley from tilting forward due to the excessive length of the construction column, thereby improving the safety of the trolley. Multiple mounting slots 58 are provided to adjust the angle of the first guide plate 59. The angle between the first guide plate 59 and the metal ball 57 is 15°-60°, and the preferred position of the first guide plate 59 is 45°.

[0047] Furthermore, the first crossbar 109 is equipped with an infrared transmitter and receiver for the tracking trolley system, used to sense the black and white lines laid on the construction site.

[0048] By installing infrared transmitters and receivers on the transport vehicle for the tracking vehicle, the transport vehicle can continuously emit infrared rays into the ground. When the infrared rays encounter a white ground, they will undergo diffuse reflection, and the reflected light will be received by the receiver. However, when they encounter a black track line, the infrared rays will be absorbed, and the receiver will not receive the reflected light. In this way, the vehicle can determine whether it has deviated from the track based on the presence or absence of the received reflected light, and maintain its position on the track by adjusting the speed of the left and right wheels.

[0049] In summary, this invention provides a construction transport trolley that solves the problems of inconvenience, time-consuming and labor-intensive use, poor safety and practicality when transport trolleys are widely used on construction sites to move construction columns. It also avoids the problem of the vehicle body 1 easily tipping over, thus making it easier for workers to use. This not only reduces the labor intensity of workers, but also further improves construction efficiency.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A construction transport trolley, characterized in that: It includes a vehicle body (1) for transportation, on which a lifting assembly (2) is provided.

2. The construction transport trolley as described in claim 1, characterized in that: The vehicle body (1) includes a base (101). A first connecting rod (102) is horizontally provided at both the front and rear ends of the left side of the base (101). The right end of the first connecting rod (102) is fixedly connected to the base (101). A second connecting rod (103) is provided between the two first connecting rods (102). The two ends of the second connecting rod (103) are fixedly connected to the left ends of the two first connecting rods (102) respectively. A longitudinal shaft (104) is horizontally provided below the first connecting rod (102). Wheels (105) are fixedly sleeved at both ends of the shaft (104). A sleeve (106) is rotatably sleeved between the two wheels (105) of the shaft (104). Connecting blocks (107) are fixedly connected to both ends of the upper side of the sleeve (106). The two connecting blocks (107) are fixedly connected to the bottom of the two first connecting rods (102) respectively. Two casters (108) are installed on the lower right side of the base (101), one in front of the other. Horizontal first crossbars (109) are fixedly connected to both the front and rear sides of the upper surface of the base (101). A vertical fixed rod (110) is fixedly connected to the upper surface of the first crossbar (109) on the rear side. A horizontal third connecting rod (111) is fixedly connected to the upper end of the fixed rod (110). The right end of the third connecting rod (111) is provided with a handle (112) and a control area (3) for controlling the lifting assembly (2). The lifting assembly (2) is set on the base (101).

3. A construction transport trolley as described in claim 2, characterized in that: The lifting assembly (2) includes two second crossbars (201), which are located between two first crossbars (109). The second crossbars (201) and the first crossbars (109) are arranged parallel to each other. The length of the second crossbars (201) is greater than the length of the first crossbars (109). The second crossbars (201) are hinged to the right side of the base (101) through a first hinge (212). A vertical support plate (202) is fixedly connected to the right end of the two second crossbars (201). A first longitudinal bar (203) is horizontally provided between the two second crossbars (201). The first longitudinal bar (203) is located to the left of the second connecting rod (103), and the two ends of the first longitudinal bar (203) are fixedly connected to the two second crossbars (201) respectively. A first placement groove (204) is provided in the middle of the upper surface of the base (101) and a protective plate (205) is installed on the right side of the base (101) at the first placement groove (204). A second placement groove (206) is provided in the middle of the upper surface of the second connecting rod (103) and is provided in the middle of the upper surface. A cylinder (207) is hinged in the first placement groove (204). The output end of the cylinder (207) is placed in the second placement groove (206) and the output end of the cylinder (207) is hinged to the middle of the right side of the first vertical rod (203) through the second hinge (213). The depth of the first placement groove (204) is greater than the depth of the second placement groove (206). The cylinder (207) is tilted with the left side higher than the right side.

4. A construction transport trolley as described in claim 3, characterized in that: The control area (3) includes a placement box (31) consisting of a connecting plate. The placement box (31) is fixedly connected to the right end of the third connecting rod (111). The placement box (31) is divided into two areas. The handle (112) is fixed in one area, and the switch controller (4) for controlling the cylinder (207) is placed in the other area.

5. A construction transport trolley as described in claim 3, characterized in that: A first longitudinal roller (208) is horizontally mounted on the right side of the upper surface of the base (101), and a second roller (209) parallel to the first roller (208) is mounted at both the front and rear ends of the upper surface of the second connecting rod (103).

6. A construction transport trolley as described in claim 3, characterized in that: A second longitudinal bar (210) is horizontally provided at the left end of the two second crossbars (201), and a third roller (211) is installed on the left side of the second longitudinal bar (210).

7. A construction transport trolley as described in claim 2, characterized in that: An automatic balancing assembly (5) is provided at the left end of each of the two first crossbars (109). The automatic balancing assembly (5) includes an electric push rod (51) fixed vertically at the left end of the first crossbar (109). An auxiliary wheel (52) is fixedly connected to the lower end of the electric push rod (51). The lowest point of the auxiliary wheel (52) is higher than the lowest point of the wheel (105). The wheel (105) is flush with the universal wheel (108). A housing (53) with a semi-circular vertical cross-section is provided between the electric push rod (51) and the wheel (105). The horizontal side of the housing (53) is fixed on the first crossbar (109). The housing (53) is provided with an arc-shaped partition. The housing (53) is divided into a semi-circular first cavity (54) and a semi-annular second cavity (55) by the partition. The second cavity (55) is located outside the first cavity (54). A signal sensor (56) is fixedly installed in the first cavity (54), and a metal ball (57) is provided in the second cavity (55). A plurality of mounting slots (58) are provided on the partition plate, and the plurality of mounting slots (58) are arranged sequentially along the left circumference of the partition plate. It also includes a first guide plate (59) and a second guide plate (510). The first guide plate (59) is located in the second cavity (55). One end of the first guide plate (59) is snapped into one of the mounting slots (58). The other end of the first guide plate (59) is fixed on the inner bottom wall of the housing (53). A first pressure sensor is provided on the side of the first guide plate (59) near the metal ball (57). The second guide plate (510) is fixed at the bottom of the second cavity (55) and located on the right side of the metal ball (57). A second pressure sensor is provided on the side of the second guide plate (510) near the metal ball (57). The signal sensor (56) is electrically connected to the electric push rod (51), the first pressure sensor, and the second pressure sensor, respectively.

8. A construction transport trolley as described in claim 2, characterized in that: The first crossbar (109) is equipped with an infrared transmitter and receiver for a tracking trolley system, used to sense the black and white lines laid on the construction site.

Images