Wave detector wall attaching device for seismic mapping method

Abstract

The utility model belongs to the field of engineering geophysical exploration, and provides a geophone wall-attaching device for a seismic imaging method, which is suitable for mounting and dismounting a geophone, and comprises a connecting piece connected with the geophone; the adsorption mechanism is connected with the connecting piece; wherein the adsorption mechanism can be adsorbed and fixed with a to-be-detected wall surface, and enables the detector to abut against the to-be-detected wall surface. According to the utility model, the detector and the adsorption mechanism are connected through the connecting piece, the adsorption mechanism is adsorbed on the to-be-detected wall surface by using the atmospheric pressure principle, and the detector is abutted against the to-be-detected wall surface, so that the detector is quickly attached to the to-be-detected wall surface, the waiting time for adopting binders such as gypsum and the like is shortened, and the quality of collected data is ensured; and the working efficiency of tunnel lining quality detection by the seismic mapping method is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the engineering geophysical exploration field, concretely relates to a geophone wall sticking device for seismic imaging method. BACKGROUND

[0002] Lining is a permanent support structure constructed along the tunnel body with reinforced concrete and other materials to prevent deformation or collapse of surrounding rock. The quality of lining plays an important role in the stability, safety and long-term operation of engineering structures. Seismic imaging method is a commonly used method for detecting lining quality. When testing the side wall or the roof, the geophone and the side wall or the roof need to be firmly pasted.

[0003] In related technologies, the main way to paste the geophone is to use adhesive to paste the geophone to the side wall or the roof, which consumes a lot of manpower and time, resulting in low work efficiency. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a geophone wall sticking device for seismic imaging method to solve the problem of low work efficiency caused by the need to consume a lot of manpower and time to paste the geophone to the wall surface in the prior art.

[0005] The utility model provides a geophone wall sticking device for seismic imaging method, which is suitable for installing and dismounting the geophone, comprising: a connecting piece connected with the geophone; and an adsorption mechanism connected with the connecting piece; wherein the adsorption mechanism can be adsorbed and fixed to the wall surface to be measured, and the geophone is in abutment with the wall surface to be measured.

[0006] As an optional embodiment, the adsorption mechanism comprises: a suction cup assembly; a vacuum generator; and an air pipe connected with the vacuum generator and the suction cup assembly; wherein when the vacuum generator is turned on, the vacuum generator removes the internal air of the suction cup assembly through the air pipe, so that the suction cup assembly is adsorbed on the wall surface to be measured; and when the vacuum generator is turned off, the suction cup assembly is separated from the wall surface to be measured.

[0007] As an optional embodiment, the suction cup assembly comprises: a vacuum suction cup arranged on one side of the connecting piece; and a double-pass hollow rod body penetrating through the connecting piece and connected with the vacuum suction cup, wherein one end of the double-pass hollow rod body away from the vacuum suction cup is connected with the air pipe.

[0008] As an optional implementation, the connecting piece is provided with an avoiding hole, the double-pass hollow rod body is a double-pass threaded rod, one end of the double-pass hollow rod body is threadedly connected with the vacuum chuck and penetrates through the avoiding hole, and the vacuum chuck assembly further comprises a nut, which is arranged at the connecting position of the double-pass hollow rod body and the vacuum chuck, so that the vacuum chuck is attached to the connecting piece when the nut is screwed.

[0009] As an optional implementation, one end of the double-pass hollow rod body away from the vacuum chuck is provided with a connecting port, and the connecting port is detachably connected with the air pipe.

[0010] As an optional implementation, the vacuum chuck assembly is provided in plurality, the air pipe is divided into multiple pipeline sections, and the pipeline sections are connected to the connecting ports, so that the plurality of vacuum chuck assemblies are respectively connected with the air pipe.

[0011] As an optional implementation, each double-pass hollow rod body is provided with two connecting ports, and one of the connecting ports of one double-pass hollow rod body is provided with a gas blocking cover.

[0012] As an optional implementation, the vacuum generator comprises a box body provided with an air cavity, an air inlet and an air outlet, the air inlet is connected with one end of the air pipe, and a gas pump is adapted to extract vacuum from the air cavity.

[0013] As an optional implementation, the detector is arranged on one side of the connecting piece, the other side of the connecting piece is provided with a coupling block, the coupling block is arranged opposite to the detector, and the thickness of the coupling block is the distance between the connecting piece and the wall surface to be measured after the adsorption mechanism is adsorbed on the wall surface to be measured.

[0014] As an optional implementation, the connecting piece is provided with a handle.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. The utility model discloses a connecting piece connecting a detector and an adsorption mechanism, utilizes atmospheric pressure principle, makes the adsorption mechanism adsorb on the wall surface to be measured, simultaneously makes the detector abut on the wall surface to be measured, realizes the quick adhesion of the detector and the wall surface to be measured, reduces the waiting time of adopting plaster and the like bonding agent, guarantees the quality of the collected data, and improves the working efficiency of the seismic imaging method tunnel lining quality detection.

[0017] 2. By arranging a handle on one side of the connecting piece, the construction personnel only need to hold the handle to adjust the measuring point, so that the installation and dismounting of the detector are more convenient. DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 It is a structural schematic view of the geophone wall-attached device for the seismic imaging method according to an embodiment of the present application.

[0020] Figure 2 It is a structural schematic view of the connecting piece of the geophone wall-attached device for the seismic imaging method according to an embodiment of the present application.

[0021] Explanation of reference signs:

[0022] 1-geophone; 2-connecting piece; 201, first symmetry line; 202, second symmetry line; 21-coupling block; 22-avoidance hole; 3-vacuum chuck; 4-handle; 41-handle connecting block; 42-handle body; 43-gripper; 5-double-pass hollow rod body; 51-nut; 6-air resistance cover; 7-ventilation pipe; 71-first pipe; 72-second pipe; 8-vacuum generator; 81-inhale port; 82-exhale port; 83-air pump. Specific embodiments

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0024] In the description of the present application, it should be noted that the directions or position relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connection" should do the broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through the intermediate medium, can be the communication inside two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0027] The installation of the detector adopts the paste of plaster and other adhesives, which is a relatively common way, and the following problems may exist:

[0028] Consumes manpower: the detector is pasted to the side wall and the roof by using plaster and other adhesives, which requires multiple people to cooperate with each other to paste, consumes a large amount of manpower and time;

[0029] Low fault tolerance: the solidification time and the fitting degree of plaster depend on the subjective experience of the operator, and if the pasting is wrong, it needs to be pasted repeatedly;

[0030] Poor flexibility: every time a measuring point is moved, the detector needs to be disassembled and pasted to a new measuring point;

[0031] Cleaning difficulty: the residues of plaster and other adhesives on the detector need to be chiseled and cleaned, and improper operation is easy to damage the detector, and the repeated pasting and cleaning work is time-consuming.

[0032] The embodiments of the utility model will be described below in combination with Figure 1 and Figure 2 .

[0033] As Figure 1 shown, according to the embodiments of the utility model, a detector wall pasting device for seismic imaging method is provided, which is suitable for installing or dismounting the detector 1, and the detector wall pasting device for seismic imaging method comprises: a connecting piece 2 connected with the detector 1; and an adsorption mechanism connected with the connecting piece 2; wherein the adsorption mechanism can be adsorbed and fixed with the wall surface to be measured, and the detector 1 is in abutment with the wall surface to be measured.

[0034] In this embodiment, the detector wall pasting device for seismic imaging method comprises the detector 1, the connecting piece 2 and the adsorption mechanism. The connecting piece 2 can be selected as a rectangular metal plate, which has high strength and is not easy to deform. The connecting piece 2 adopts a rectangular plate design, which is convenient for tightly pasting the detector 1 on the connecting piece 2. The wall surface to be measured includes but is not limited to the side wall and the roof.

[0035] In use, the adsorption mechanism is adsorbed on the wall surface to be measured, and the detector 1 is in abutment with the wall surface to be measured, so that the detector 1 is fixed on the wall surface to be measured by the adsorption of the adsorption mechanism, which realizes that the detector 1 is quickly attached to the wall surface to be measured, compared with the way of fixing the detector 1 by pasting plaster on the detector 1, the waiting time of plaster pasting is reduced, the trouble of repeatedly cleaning the surface of the detector is avoided, and the problem of damaging the detector 1 is also avoided, and at the same time, the time for fixing the detector 1 is saved, and the working efficiency of the seismic imaging method tunnel lining quality detection is improved.

[0036] The detector 1 will not be damaged during the entire fixing process, and the detection cost is reduced.

[0037] Optionally, the adsorption mechanism comprises: a plurality of suction cup assemblies; a vacuum generator 8; and an air pipe 7 connected between the vacuum generator 8 and the suction cup assemblies, wherein when the vacuum generator 8 is started, the vacuum generator 8 removes the internal air of the suction cup assemblies through the air pipe 7, so that the suction cup assemblies are adsorbed on the wall surface to be measured; and when the vacuum generator 8 is turned off, the suction cup assemblies are separated from the wall surface to be measured.

[0038] In this embodiment, the adsorption mechanism comprises the suction cup assembly, the vacuum generator 8 and the air pipe 7. One end of the air pipe 7 is detachably connected with the suction cup assembly, and the other end of the air pipe 7 is detachably connected with the vacuum generator 8, so that the suction cup assembly and the vacuum generator 8 are connected in series through the air pipe 7, which is simple in structure and convenient to install. When the vacuum generator 8 is started, the vacuum generator 8 can remove the internal air of the suction cup assembly through the air pipe 7, so that the internal air of the suction cup assembly is in a vacuum state. Due to the atmospheric pressure principle, the suction cup assembly is tightly attached to the wall surface to be measured. When the vacuum generator 8 is turned off, air enters the suction cup assembly, the atmospheric pressure difference disappears, and the suction cup assembly automatically separates from the wall surface to be measured. Then, the suction cup assembly can be installed at the next measuring point again, which greatly speeds up the installation and disassembly of the detector 1 and improves the working efficiency.

[0039] The air pipe 7 is a soft pipe, which can change the connection path according to the change of the connection requirement, has high flexibility and high usability.

[0040] Optionally, the suction cup assembly comprises: a vacuum suction cup 3 arranged on one side of the connecting piece 2; and a double-pass hollow rod body 5 penetrating through the connecting piece 2 and connected with the vacuum suction cup 3, wherein one end of the double-pass hollow rod body 5 away from the vacuum suction cup 3 is connected with the air pipe 7.

[0041] In this embodiment, the suction cup assembly comprises the vacuum suction cup 3 and the double-pass hollow rod body 5. The vacuum suction cup 3 is a deep suction cup, which is also applicable to curved surfaces, and is made of silicone rubber, which is very suitable for grabbing rough side walls or cave ceilings. The model is a general suction cup, which is convenient to replace when it is damaged.

[0042] Further, the connecting piece 2 is provided with an avoiding hole 22, the double-pass hollow rod body 5 is a double-pass hollow threaded rod, one end of the double-pass hollow rod body 5 is threadedly connected with the vacuum chuck 3 and penetrates the avoiding hole 22, and the vacuum chuck assembly further comprises a nut 51, which is arranged at the connection between the double-pass hollow rod body 5 and the vacuum chuck 3, so that the vacuum chuck 3 is attached to the connecting piece 2 when the nut 51 is screwed.

[0043] In the embodiment, the surface of the double-pass hollow rod body 5 is provided with threads, and the double-pass hollow rod body 5 can be a double-pass hollow threaded rod. Figure 2 As shown in the figure, the connecting piece 2 is provided with a plurality of avoiding holes 22, for example, two avoiding holes 22 can be provided, the connecting piece 2 is in the shape of a rectangular plate, the connecting piece 2 has a first symmetry line 201 and a second symmetry line 202, the first symmetry line 201 extends in the length direction of the connecting piece 2, and the second symmetry line 202 extends in the width direction of the connecting piece 2. The two avoiding holes 22 are respectively arranged on the first symmetry line 201 and symmetrically arranged about the first symmetry line 201, and the two avoiding holes 22 are also symmetrically arranged about the second symmetry line 202, so that the vacuum chuck 3 installed in the avoiding hole 22 is more stable after being adsorbed to the wall surface to be detected, the detector 1 is more balanced when being in abutment with the wall surface to be detected, and the quality of the detection data can be improved. The connecting piece 2 is an iron plate, and the two sides of the iron plate are provided with the two avoiding holes 22.

[0044] The vacuum chuck 3 is provided with threads matched with the double-pass hollow rod body 5 at the connection with the double-pass hollow rod body 5, so that the two are threadedly connected and are convenient to disassemble.

[0045] The vacuum chuck assembly penetrates the corresponding avoiding holes 22, so that the vacuum chuck assembly is detachably connected with the connecting piece 2. The connecting piece 2 divides the vacuum chuck assembly into two parts, one part is the vacuum chuck 3, which has the function of adsorbing the wall surface, and the other part is the double-pass hollow rod body 5, which is connected with the air pipe 7 to discharge or receive air. The nut 51 is in the shape of a ring, the inside of the nut 51 is provided with threads matched with the double-pass hollow rod body 5, so that the double-pass hollow rod body 5 is threadedly connected with the nut 51. One side end surface of the nut 51 is in close abutment with the connecting piece 2, which can strengthen the stability of the connection between the vacuum chuck assembly and the connecting piece 2, and prevent the problem of air leakage in the vacuum chuck 3 from causing adsorption failure.

[0046] In another embodiment, one end of the double-pass hollow rod body 5 away from the vacuum chuck 3 is provided with a connecting port, and the connecting port is detachably connected with the air pipe 7.

[0047] In the embodiment, the connecting port is provided with threads, and the pipe opening of the air pipe 7 connected therewith is provided with threads matched with the connecting port, so that the two are connected with each other, which is convenient for installation and disassembly and ensures good air tightness.

[0048] Further, the plurality of suction cup assemblies are provided, and the air pipe 7 is divided into multiple sections, and the sections are connected to the connecting ports, so that the plurality of suction cup assemblies are connected to the air pipe 7.

[0049] In the embodiment, the air pipe 7 is divided into multiple sections, and the two ends of each section of the air pipe 7 are provided with threads matched with the air holes, and the two double-pass hollow rods 5 are connected, so that the air pipe 7 connects the plurality of double-pass hollow rods 5 in series to form an integrated air pipe 7. The plurality of double-pass hollow rods 5 are arranged at intervals.

[0050] Further, each double-pass hollow rod 5 is provided with two connecting ports, and one of the connecting ports of one double-pass hollow rod 5 is provided with the air blocking cover 6.

[0051] In the embodiment, the two connecting ports are provided with threads, and the threads of the connecting ports of the air pipe 7 can be connected to each other, and the two connecting ports are of the same size, so that the workpiece can be uniformly machined. The edge of the cover body of the air blocking cover 6 is provided with threads, and the threads of the connecting port of one double-pass hollow rod 5 can be connected to each other, so that air leakage can be prevented.

[0052] Optionally, the vacuum generator 8 comprises a box body provided with an air cavity, an air inlet 81 and an air outlet 82, the air inlet 81 is connected to one end of the air pipe 7, and a gas pump 83 is adapted to extract vacuum from the air cavity.

[0053] In the embodiment, the vacuum generator 8 comprises the box body and the gas pump 83. The vacuum generator 8 comprises a box body having a box-shaped structure, the air inlet 81 and the air outlet 82 are arranged on the box body, the gas pump 83 is arranged in the air cavity in the box body, one end of the air pipe 7 is detachably connected to the air inlet 81, and the other end of the air pipe 7 is detachably connected to the suction cup assembly. When the air outlet 82 is closed and the gas pump 83 is started, the gas pump 83 exhausts the gas in the suction cup assembly through the air pipe 7 connected to the air inlet 81, so that the suction cup assembly is tightly pressed against the wall surface to be detected; when the detector 1 is used, the air outlet 82 is opened, and the air enters the suction cup assembly through the air pipe 7, so that the pressure difference disappears, and the suction cup assembly automatically falls off, thereby improving the detection efficiency.

[0054] Further, the detector is arranged on one side of the connecting piece 2, and the other side of the connecting piece 2 is provided with a coupling block 21, the coupling block 21 is arranged opposite to the detector, and the thickness of the coupling block 21 is the distance between the connecting piece 2 and the wall or the ceiling when the vacuum suction cup 3 is tightly attached to the wall or the ceiling.

[0055] In the embodiment, after the adsorption mechanism is adsorbed on the wall surface to be measured, the coupling block 21 can abut against the wall surface to be measured. The coupling block 21 is the same size as the detector 1, and the thickness is the distance between the connecting piece 2 and the wall or the roof when the vacuum chuck 3 is closely attached to the wall or the roof, which is used for better coupling of the detector and the wall or the roof. The coupling block 21 is made of the same material as the connecting piece 2, has high strength, and is more sensitive to wave transmission and change, thereby improving the accuracy of signal acquisition of the detector 1.

[0056] Optionally, as shown in Figure 2 The connecting piece 2 is provided with a handle 4.

[0057] In the embodiment, the handle 4 includes a handle connecting block 41, a handle body 42, and a hand grip 43, and the handle body 42 is an iron pipe. The handle connecting block 41 is arranged on the connecting piece 2, and one end of the handle body 42 is connected to the handle connecting block 41. The handle connecting block 41 and the detector 1 are arranged on the second symmetry line 202, and the handle connecting block 41 and the detector 1 are symmetrically arranged about the first symmetry line 201, so that the balance of the overall structure is ensured. The hand grip 43 is arranged on the end of the handle body 42 away from the handle connecting block 41, and the hand grip 43 is a semicircular hand grip, which is convenient for a construction worker to hold tightly and facilitates installation of the detector 1.

[0058] The connecting pipe 7 includes a first pipe 71 and a second pipe 72. The connecting process of the wall-attached detector device for the seismic imaging method is as follows: the double-pass hollow screw passes through the corresponding avoiding hole 22 and is connected to the vacuum chuck 3. After the double-pass hollow screw is connected to the vacuum chuck 3, the nut 51 is rotated to tightly attach the connecting piece 2 to the upper end of the vacuum chuck 3. One end of one of the double-pass hollow screws is connected to the gas blocking cover 61, and the other end is connected to one end of the first pipe 71. The other end of the first pipe 71 is connected to one end of the other double-pass hollow screw. The other end of the other double-pass hollow screw is connected to one end of the second pipe 72. The other end of the second pipe 72 is connected to the miniature vacuum generator 8. In this way, the connection of the device is completed.

[0059] In use, the semicircular hand grip 41 is held, and the two vacuum chucks 3 are attached to the wall or the roof. The air outlet 82 is closed, the air suction pump 83 is opened, the air in the vacuum chuck 3 is removed, the vacuum chuck 3 is tightly adsorbed on the wall or the roof, the coupling block 21 is closely attached to the wall or the roof, and the detector 1 is also tightly fixed on the wall or the roof. After measurement is completed, the air outlet 82 is opened, air enters the vacuum chuck 3, and the vacuum chuck 3 is automatically separated from the wall or the roof. The device is moved, and the next measurement point can be measured.

[0060] The utility model discloses small, convenient connection, portable, can be close to the wall or the hole top quickly, has reduced the waiting time of plaster pasting, can avoid repeatedly cleaning the detector surface, can avoid damaging the detector 1 and saving time simultaneously, can realize the close adhesion of detector 1 and the wall, the hole top, has improved the work efficiency of seismic imaging method tunnel lining quality detection greatly.

[0061] Obviously, the above embodiments are only examples for clearly illustrating, not limiting the embodiments.

[0062] For ordinary skilled people in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A geophysical imaging method geophone attachment device adapted to attach or detach a geophone (1), characterized in that, The geophysical imaging method uses a geophone wall-attached device, which comprises: a connecting piece (2) connected with the geophone (1); an adsorption mechanism connected with the connecting piece (2); wherein the adsorption mechanism can be adsorbed and fixed to a wall surface to be measured, and the geophone (1) is in abutment with the wall surface to be measured; the adsorption mechanism comprises: a suction cup assembly; a vacuum generator (8); an air pipe (7) connecting the vacuum generator (8) and the suction cup assembly; wherein when the vacuum generator (8) is turned on, the vacuum generator (8) removes the internal air of the suction cup assembly through the air pipe (7) to make the suction cup assembly adsorbed on the wall surface to be measured; and when the vacuum generator (8) is turned off, the suction cup assembly is separated from the wall surface to be measured.

2. The geophysical method geophone sticking device according to claim 1, wherein the suction cup assembly comprises: a vacuum suction cup (3) arranged on one side of the connecting piece (2); a double-pass hollow rod body (5) penetrating through the connecting piece (2) and connected with the vacuum suction cup (3), one end of the double-pass hollow rod body (5) away from the vacuum suction cup (3) being connected with the air pipe (7).

3. The geophysical method geophone sticking device according to claim 2, wherein, the connecting piece (2) is provided with an avoiding hole (22), the double-pass hollow rod body (5) is a double-pass threaded rod, one end of the double-pass hollow rod body (5) being threadedly connected with the vacuum suction cup (3) and penetrating through the avoiding hole (22), and the suction cup assembly further comprises a nut (51) arranged at the connecting position of the double-pass hollow rod body (5) and the vacuum suction cup (3) to make the vacuum suction cup (3) fit the connecting piece (2) when the nut (51) is screwed.

4. The geophysical method geophone sticking device according to claim 2, wherein one end of the double-pass hollow rod body (5) away from the vacuum suction cup (3) is provided with a connecting port, and the connecting port is detachably connected with the air pipe (7).

5. The geophysical imaging geophone attachment device of claim 4, wherein, a plurality of the suction cup assemblies are arranged, the air pipe (7) is divided into a plurality of pipeline sections, and the pipeline sections are connected to the connecting ports to make the plurality of suction cup assemblies respectively communicated with the air pipe (7).

6. The geophysical imaging geophone attachment device of claim 5, wherein, each double-pass hollow rod body (5) is provided with two connecting ports, and one of the connecting ports of one double-pass hollow rod body (5) is provided with a gas blocking cover (6).

7. The geophone sticking device for seismic imaging according to any one of claims 1 to 6, characterized in that, the vacuum generator (8) comprises: a box body provided with an air cavity, an air inlet (81) and an air outlet (82), and the air inlet (81) is connected with one end of the air pipe (7); an air pump (83) adapted to extract vacuum in the air cavity.

8. The geophone sticking device for seismic imaging according to any one of claims 1 to 6, characterized in that, the geophone is arranged on one side of the connecting piece (2), the other side of the connecting piece (2) is provided with a coupling block (21), the coupling block (21) is arranged opposite to the geophone, the thickness of the coupling block (21) is the distance between the connecting piece (2) and the wall surface to be measured after the adsorption mechanism is adsorbed on the wall surface to be measured.

9. The geophone sticking device for seismic imaging according to any one of claims 1 to 6, characterized by, the connecting piece (2) is provided with a handle (4).

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