Battery car sliding automatic alarm system for shield construction

Abstract

The invention relates to the technical field of shield construction, in particular to a battery car sliding automatic alarm system for shield construction. The invention discloses a battery car sliding automatic alarm system for shield construction, and the system comprises a speed detection module which is used for detecting the speed information of a battery car running on a track in a tunnel; the signal transmission module is used for transmitting the speed information, collected by the speed detection module, of the battery car to a tunnel and a ground duty room in real time; when the battery car stalls, the overspeed alarm module starts to send alarm information to the interior of the tunnel and the ground; the speed detection module comprises a radar speed measurement device arranged in the tunnel, and the signal transmission module comprises a wired optical fiber cable arranged on the inner side wall of the tunnel. When the electric vehicle stalls, an alarm is given out immediately inside and outside the tunnel, the stability and firmness of installation of the radar speed measuring device are improved, and irregular jumping of the radar speed measuring device due to vibration is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, in particular to an automatic alarm system for slipping of a battery vehicle used in shield construction. Background Art

[0002] The use of shield machines for construction in subway sections is becoming increasingly common. In the underground construction space, the head of the shield machine plays the role of forward excavation. Several electric vehicles (also called trolleys) are connected to the rear of the head. The electric vehicles are loaded with various required materials and equipment, so that they can carry out operations such as transporting soil outward and laying pipe segments while excavating forward. When passing through a slope, or when the electric vehicle is heavily loaded, it will cause the electric vehicle to slip. Generally, anti-skid devices are set at the front and rear of the electric vehicle. Activating the anti-skid device in time can prevent the electric vehicle from slipping. If the anti-skid device is not activated in time, or if the anti-skid device fails, it will cause the electric vehicle to slip and stall on the track.

[0003] The most important task after an electric vehicle stalls is to evacuate the workers in the tunnel. In the existing technology, after the personnel outside the tunnel, the electric vehicle driver or the ground duty room discover the process, they need to notify the signalman or the main engine room driver in the tunnel through an intercom, the duty room phone or WeChat phone, and then the main engine room driver or the signalman will pass it on to other workers in the tunnel. The information transmission process is long and it is impossible to notify all personnel in the tunnel in the first time, leaving the workers in the tunnel with short reaction time and evacuation time, which poses a major safety hazard. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic alarm system for a battery vehicle used in shield construction to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: an automatic alarm system for a battery vehicle used in shield construction that slips, the system comprising: a speed detection module for detecting speed information of the battery vehicle traveling on the track in the tunnel;

[0006] The signal transmission module is used to transmit the speed information of the electric vehicle collected by the speed detection module to the tunnel and the ground duty room in real time;

[0007] Overspeed alarm module: When the electric vehicle stalls, the overspeed alarm module starts to send alarm information to the tunnel and the ground;

[0008] The speed detection module includes a radar speed measuring device installed in the tunnel, the signal transmission module includes a wired optical fiber cable installed on the inner wall of the tunnel, and the overspeed alarm module includes several column sound alarms. The column sound alarms are all installed on the head of the shield machine, the electric vehicle behind the shield machine, the underground duty room and the ground duty room, which are used to broadcast the electric vehicle stall information in real time.

[0009] Furthermore, the radar speed measuring device includes a support rod, a radar speed measuring device body, a searchlight and a camera. The radar speed measuring device body is located in the middle of the support rod, and the searchlight and camera are located at the top of the support rod, which are used to capture the object to which the data to be measured belongs; a mounting mechanism is provided at the bottom of the support rod, and a shock-absorbing mechanism is provided on the ground of the tunnel, and the support rod is connected to the shock-absorbing mechanism through the mounting mechanism.

[0010] Furthermore, the shock absorbing mechanism includes a base, a rubber middle seat is provided on the base along its height direction, a top seat is provided on the rubber middle seat, the top seat, the rubber middle seat and the base are connected by a threaded rod, and a gap is left between the top seat and the base to reduce the vibration force directly transmitted from the base to the top seat.

[0011] Furthermore, the mounting mechanism includes an adjusting rod, one end of the adjusting rod is the center end e, and the other end is the free end of the adjusting rod. The free end of the adjusting rod is rotatably connected to the support rod and is used to fold and unfold the adjusting rod. There are at least three adjusting rods, and the three adjusting rods are equidistantly distributed along the outer circumference of the support rod.

[0012] Furthermore, the top seat is provided with at least three mounting grooves opening upward, and the three mounting grooves are distributed in a circular array with the center of the support rod as the center of the circle; a connecting piece is rotatably provided below the corresponding center end e on the support rod, and a connecting box is provided on the adjusting rod; when the connecting piece is inserted into the connecting box, the adjusting rod, the support rod and the connecting piece form a triangular support.

[0013] Furthermore, the connecting part includes a connecting rod, an arc-shaped positioning block, a rope, a tail plate and a gravity ball. One end of the connecting rod is rotatably connected to the support rod, and the other end is fixedly connected to the arc-shaped positioning block. An arc-shaped socket is provided through the connecting box, and the arc-shaped socket is adapted to the arc-shaped positioning block.

[0014] Furthermore, a through hole 1 is provided in the arc-shaped positioning block along its arc direction, and a through hole 2 is provided in the connecting rod along its width direction. One end of the rope is connected to a gravity ball, and the other end of the rope is connected to the tail plate after passing through through hole 2 and through hole 1 in sequence. The cross-section of the arc-shaped jack on the bottom surface of the connecting box is a rectangle, and the rectangle includes adjacent long sides m and short sides n. The side of the tail plate connected to the rope is face c; the length of one pair of opposite sides in face c is equal to the length of the long side m, and the length of the other pair of opposite sides is greater than the length of the short side n.

[0015] Furthermore, the support rod is inserted into the base after passing through the top seat and the rubber middle seat. The support rod is symmetrically provided with protrusions corresponding to the top seat, and the top seat is provided with grooves that fit with the protrusions. The support rod is provided with a rubber shock-absorbing layer corresponding to the base, which blocks part of the vibration from being transmitted to the support rod through the rubber shock-absorbing layer.

[0016] The vertical cross-section of the tunnel excavated by the shield machine head is circular, the rails are set at the bottom of the circle, and the base is set on one side of the rails. The electric vehicle moves back and forth on the rails. In order to make the base fit better with the inner wall of the tunnel, the base is provided with an arc-shaped a surface, and the a surface fits the shape of the inner wall of the tunnel. The base is also provided with a b surface facing the rails. The base is symmetrically provided with threaded holes and also includes bolt 2. The bolt 2 is connected to the inner wall of the tunnel after passing through the threaded hole. The base is symmetrically provided with lifting rings to facilitate the transfer of the base to the installation position.

[0017] Furthermore, the base is made of concrete.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention can immediately sound an alarm inside and outside the tunnel when an electric vehicle stalls, and notify all personnel in the tunnel at the first time, so that the personnel in the tunnel can react quickly, evacuate in time, and reduce the damage caused by the stall of the electric vehicle; the rubber middle seat blocks part of the vibration from being transmitted to the top seat, and the rubber shock-absorbing layer blocks part of the vibration from being transmitted to the support rod. The gravity ball at one end of the rope will swing back and forth, dissipating part of the vibration, so that the installation foundation of the radar speed measuring device is firm and stable, and the shaking amplitude of the radar speed measuring device itself when vibration is transmitted is reduced, and the radar speed measuring device is avoided from irregular jumping due to vibration; when the vibration is greater, the swing amplitude of the gravity ball is greater, the connection between the arc-shaped positioning block and the arc-shaped jack is more firm, and the triangular support is more firm, thereby further improving the stability and firmness of the installation of the radar speed measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention;

[0021] Figure 2 A cross-sectional view of a portion of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0024] Figure 5 A perspective view of the connection box of the present invention;

[0025] In the figure: 1. Support rod; 2. Radar speed measuring device body; 3. Searchlight; 4. Camera; 5. Base; 6. Rubber middle seat; 7. Top seat; 8. Adjustment rod; 9. Mounting slot; 10. Connecting box; 11. Connecting rod; 12. Arc-shaped positioning block; 13. Rope; 14. Tail plate; 15. Gravity ball; 16. Arc-shaped jack; 17. Through hole 1; 18. Through hole 2; 20. Bump; 21. Threaded hole; 22. Lifting ring. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 5 .

[0028] The present invention provides an automatic alarm system for battery vehicles used in shield construction to prevent slippage, the system comprising: a speed detection module for detecting speed information of the battery vehicles running on the track in the tunnel;

[0029] The signal transmission module is used to transmit the speed information of the electric vehicle collected by the speed detection module to the tunnel and the ground duty room in real time;

[0030] Overspeed alarm module: When the electric vehicle stalls, the overspeed alarm module starts to send alarm information to the tunnel and the ground;

[0031] The speed detection module includes a radar speed measuring device installed in the tunnel, the signal transmission module includes a wired optical fiber cable installed on the inner wall of the tunnel, and the overspeed alarm module includes several column sound alarms. The column sound alarms are all installed on the head of the shield machine, the electric vehicle behind the shield machine, the underground duty room and the ground duty room, which are used to broadcast the electric vehicle stall information in real time.

[0032] The radar speed measuring device includes a support rod 1, a radar speed measuring device body 2, a searchlight 3 and a camera 4. The radar speed measuring device body 2 is located in the middle of the support rod 1, and the searchlight 3 and the camera 4 are located at the top of the support rod 1, and are used to capture the object to which the data to be measured belongs; a mounting mechanism is provided at the bottom of the support rod 1, and a shock-absorbing mechanism is provided on the ground of the tunnel, and the support rod 1 is connected to the shock-absorbing mechanism through the mounting mechanism.

[0033] The shock absorbing mechanism includes a base 5, a rubber middle seat 6 is provided on the base 5 along its height direction, a top seat 7 is provided on the rubber middle seat 6, the top seat 7, the rubber middle seat 6 and the base 5 are connected by a threaded rod, and a gap is left between the top seat 7 and the base 5 to reduce the vibration force directly transmitted from the base 5 to the top seat 7.

[0034] The mounting mechanism includes an adjusting rod 8, one end of the adjusting rod 8 is the center end e, and the other end is the free end of the adjusting rod 8. The free end of the adjusting rod 8 is rotatably connected to the support rod 1 and is used to fold and unfold the adjusting rod 8. There are at least three adjusting rods 8, and the three adjusting rods 8 are equidistantly distributed along the outer circumference of the support rod 1.

[0035] The top seat 7 is provided with at least three mounting grooves 9 opening upward, and the three mounting grooves 9 are distributed in a circular array with the center of the support rod 1 as the center of the circle; a connecting piece is rotatably provided below the corresponding center end e on the support rod 1, and a connecting box 10 is provided on the adjusting rod 8; when the connecting piece is inserted into the connecting box 10, the adjusting rod 8, the support rod 1 and the connecting piece form a triangular support.

[0036] The connecting part includes a connecting rod 11, an arc-shaped positioning block 12, a rope 13, a tail plate 14 and a gravity ball 15. One end of the connecting rod 11 is rotatably connected to the support rod 1, and the other end is fixedly connected to the arc-shaped positioning block 12. An arc-shaped socket 16 is penetrated on the connecting box 10, and the arc-shaped socket 16 is adapted to the arc-shaped positioning block 12.

[0037] The arc-shaped positioning block 12 has a through hole 17 along its arc direction, and the connecting rod 11 has a through hole 2 18 along its width direction. One end of the rope 13 is connected to the gravity ball 15, and the other end of the rope 13 passes through through hole 2 18 and through hole 1 17 in sequence, and then connects to the tail plate 14. The cross-section of the arc-shaped insertion hole 16 on the bottom surface of the connection box 10 is rectangular, and the rectangle includes adjacent long sides m and short sides n. The side of the tail plate 14 connected to the rope 13 is surface c; the length of one pair of opposite sides in surface c is equal to the length of the long side m, and the length of the other pair of opposite sides is greater than the length of the short side n. When the straightening tail plate 14 is attached to the lower surface of the connection box 10, the pair of opposite sides of the tail plate 14 coincides with the short side n; the pair of long sides m is located between the pair of opposite sides of the tail plate 14, allowing the tilted tail plate 14 to enter the arc-shaped insertion hole 16.

[0038] The support rod 1 passes through the top seat 7 and the rubber middle seat 6 and is inserted into the base 5. The support rod 1 is symmetrically provided with a protrusion 20 corresponding to the top seat 7, and the top seat 7 is provided with a groove that fits with the protrusion 20. The support rod 1 is provided with a rubber shock-absorbing layer corresponding to the base 5, which blocks part of the vibration from being transmitted to the support rod 1 through the rubber shock-absorbing layer.

[0039] The base 5 is provided with an arc-shaped a surface, which fits the shape of the inner wall of the tunnel. The base 5 is also provided with a b surface facing the rail. The base 5 is symmetrically provided with threaded holes 21 and also includes a second bolt, which is connected to the inner wall of the tunnel after passing through the threaded hole 21. The base 5 is symmetrically provided with a lifting ring 22 to facilitate the transfer of the base 5 to the installation position.

[0040] The base 5 is made of concrete.

[0041] During operation, the system is assembled inside the tunnel: the speed detection module is connected to the signal transmission module, the overspeed alarm module is connected to the signal transmission module, and the signal transmission module is connected to each control room. A radar speed measuring device is installed on one side of the tunnel track, preferably on a sloped surface. A fiber optic cable is secured to the inner tunnel wall, and sound bar alarms are installed on the TBM head, the TBM rear electric vehicle, the ground-level and underground duty rooms. The fiber optic cable serves as the communication foundation for the entire alarm system. When a stalled vehicle is detected, the radar speed measuring device rapidly transmits an electrical signal via the fiber optic cable to the TBM head, the TBM rear electric vehicle, the ground-level and underground duty rooms. Simultaneously, the sound bar alarms on the TBM head, the TBM rear electric vehicle, the ground-level and underground duty rooms activate. This immediately sounds an alarm inside and outside the tunnel, notifying all personnel within the tunnel. This facilitates a quick response, enabling timely evacuation and minimizing damage caused by the stalled vehicle.

[0042] The accuracy of the radar speed measuring device in speed measurement affects the accuracy of the automatic vehicle slipping alarm system. When the foundation on which the radar speed measuring device is installed is unstable, the shock absorber installed on the radar speed measuring device is poor, or the radar speed measuring device itself shakes when an electric vehicle passes by, it will cause the radar speed measuring device to jump irregularly. In this case, when installing the radar speed measuring device, the base 5 is placed on one side of the rail in the tunnel through the lifting ear, with the arc-shaped surface a attached to the inner wall of the tunnel and the surface b facing the rail. The threaded hole 21 is aligned with the preset hole on the inner wall of the tunnel, and the second bolt is used to pass through the threaded hole 21 and the preset hole to complete the fixation. The rubber middle seat 6 and the top seat 7 are stacked on the base 5 in sequence, and the first bolt is used to pass through the top seat 7 and the rubber middle seat 6 and then connected to the base 5. The rubber middle seat 6 blocks part of the vibration from being transmitted to the top seat 7; the free end of the adjusting rod 8 is kept lower than the center end e by hand or with the help of tools, and the arc-shaped positioning block 12 of the connecting piece is higher than the connecting rod 11, so that the installation foundation of the radar speed measuring device is firm and stable, reducing the shaking amplitude of the radar speed measuring device itself when vibration is transmitted, and avoiding irregular jumps of the radar speed measuring device due to vibration;

[0043] Take the support rod 1 and insert its bottom into the center of the top seat 7, and align the protrusion 20 and insert it into the groove to limit the support rod 1 from rotating. When the free end of the adjusting rod 8 contacts the upper surface of the top seat 7, push the free end outward or inward so that the free end is aligned and inserted into the mounting groove 9; continue to push the support rod 1 outward through the rubber middle seat 6 and insert it into the base 5. During the downward process of the support rod 1, the adjusting rod 8 is driven along the mounting groove 9 to the bottom of the mounting groove 9; take the tail plate 14 and insert it into the arc-shaped socket 16 from above, because the cross section of the tail plate 14 is larger than the arc The cross section of the arc-shaped socket 16 is large, so the tail plate 14 needs to be tilted, and the side of the tail plate 14 that is equal to the long side m first enters the arc-shaped socket 16, and the tail plate 14 is parallel to the long side m; until the tail plate 14 is completely out from under the arc-shaped socket 16, the tail plate 14 is straightened and fits against the lower surface of the connection box 10. At this time, the tail plate 14 also drives the rope 13 to pass through the arc-shaped socket 16; the connecting piece is rotated downward so that the connecting piece is inserted into the arc-shaped socket 16 of the connection box 10; so that the adjusting rod 8, the support rod 1 and the connecting piece form a triangular support, thereby strengthening the firmness of the installation of the radar speed measuring device.

[0044] When some of the vibration is transmitted to the radar speed measuring device, or when the radar speed measuring device itself shakes and generates a small vibration when an electric car passes by, the gravity ball 15 at one end of the rope 13 will swing back and forth to release some of the vibration. During the swinging process, the centripetal force will pull the rope 13 toward the end with the gravity ball 15, and the other end of the rope 13 will drive the tail plate 14 to fit more closely against the lower surface of the blocking connection box 10. The section of the rope 13 between the through hole 17 and the through hole 2 will press down on the connecting rod 11 to prevent the vibration from causing the connecting rod 11 and the arc-shaped positioning block 12 to rotate upward, thereby avoiding damage to the triangular support. When the vibration is greater, the swing amplitude of the gravity ball 15 is greater, and the connection between the arc-shaped positioning block 12 and the arc-shaped jack 16 is more secure, thereby further improving the stability and firmness of the installation of the radar speed measuring device.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions in which both A and B are satisfied. In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "multiple" refers to more than two.

[0048] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the invention.

Claims

1. An automatic alarm system for battery vehicles used in shield construction, characterized in that: The system includes: a speed detection module for detecting speed information of an electric battery vehicle traveling on a track in a tunnel; The signal transmission module is used to transmit the speed information of the electric vehicle collected by the speed detection module to the tunnel and the ground duty room in real time; Overspeed alarm module: When the electric vehicle stalls, the overspeed alarm module starts to send alarm information to the tunnel and the ground; The speed detection module includes a radar speed measuring device installed in the tunnel, the signal transmission module includes a wired optical fiber cable installed on the inner wall of the tunnel, and the overspeed alarm module includes several column sound alarms. The column sound alarms are all installed on the head of the shield machine, the electric vehicle behind the shield machine, the underground duty room and the ground duty room, which are used to broadcast the electric vehicle stall information in real time.

2. The automatic alarm system for battery vehicles used in shield construction according to claim 1 is characterized in that: The radar speed measuring device comprises a support rod (1), a radar speed measuring device body (2), a searchlight (3) and a camera (4); the radar speed measuring device body (2) is located in the middle of the support rod (1); the searchlight (3) and the camera (4) are located at the top of the support rod (1) and are used to capture the object to which the data to be measured belongs; a mounting mechanism is provided at the bottom of the support rod (1); a shock absorbing mechanism is provided on the ground of the tunnel; and the support rod (1) is connected to the shock absorbing mechanism via the mounting mechanism.

3. The automatic alarm system for battery vehicles used in shield construction according to claim 2 is characterized in that: The shock absorbing mechanism comprises a base (5), a rubber middle seat (6) is provided on the base (5) along its height direction, a top seat (7) is provided on the rubber middle seat (6), the top seat (7), the rubber middle seat (6) and the base (5) are connected by a threaded rod, and a gap is left between the top seat (7) and the base (5) to reduce the vibration force directly transmitted from the base (5) to the top seat (7).

4. The automatic alarm system for battery vehicles used in shield construction according to claim 3 is characterized in that: The mounting mechanism comprises an adjusting rod (8), one end of the adjusting rod (8) being a center end e and the other end being a free end of the adjusting rod (8), the center end e of the adjusting rod (8) being rotatably connected to the support rod (1) and being used for folding and unfolding the adjusting rod (8), at least three adjusting rods (8) being provided, and the three adjusting rods (8) being equidistantly distributed along the outer circumference of the support rod (1).

5. The automatic alarm system for battery vehicles used in shield construction according to claim 4 is characterized in that: The top seat (7) is provided with at least three mounting grooves (9) with openings facing upward, and the three mounting grooves (9) are distributed in a circular array with the center of the support rod (1) as the center of the circle; a connecting piece is rotatably provided below the corresponding center end e on the support rod (1), and a connecting box (10) is provided on the adjustment rod (8); when the connecting piece is inserted into the connecting box (10), the adjustment rod (8), the support rod (1) and the connecting piece form a triangular support.

6. The automatic alarm system for battery vehicles used in shield construction according to claim 5 is characterized in that: The connecting member comprises a connecting rod (11), an arc-shaped positioning block (12), a rope (13), a tail plate (14) and a gravity ball (15); one end of the connecting rod (11) is rotatably connected to the support rod (1), and the other end is fixedly connected to the arc-shaped positioning block (12); an arc-shaped socket (16) is provided through the connecting box (10), and the arc-shaped socket (16) is adapted to the arc-shaped positioning block (12).

7. The automatic alarm system for battery vehicles used in shield construction according to claim 6 is characterized in that: A through hole (17) is provided in the arc-shaped positioning block (12) along its arc direction, and a through hole (18) is provided in the connecting rod (11) along its width direction. One end of the rope (13) is connected to the gravity ball (15), and the other end of the rope (13) is connected to the tail plate (14) after passing through the through hole (18) and the through hole (17) in sequence. The cross-section of the arc-shaped jack (16) on the bottom surface of the connection box (10) is rectangular, and the rectangle includes adjacent long sides m and short sides n. The side of the tail plate (14) connected to the rope (13) is the c side; the length of one pair of opposite sides in the c side is equal to the length of the long side m, and the length of the other pair of opposite sides is greater than the length of the short side n.

8. The automatic alarm system for battery vehicles used in shield construction according to claim 7 is characterized in that: The support rod (1) passes through the top seat (7) and the rubber middle seat (6) and is inserted into the base (5); a convex block (20) is symmetrically provided on the support rod (1) at a position corresponding to the top seat (7); a groove is provided in the top seat (7) to fit with the convex block (20); and a rubber shock-absorbing layer is provided on the support rod (1) at a position corresponding to the base (5).

9. The automatic alarm system for battery vehicles used in shield construction according to any one of claims 1 to 8, characterized in that: The base (5) is provided with an arc-shaped surface a, which is in contact with the shape of the inner wall of the tunnel. The base (5) is also provided with a surface b facing the rail. The base (5) is symmetrically provided with threaded holes (21) and also includes a second bolt, which is connected to the inner wall of the tunnel after passing through the threaded hole (21). The base (5) is symmetrically provided with a lifting ring (22).

10. The automatic alarm system for battery vehicles used in shield construction according to claim 9 is characterized in that: The base (5) is made of concrete.

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