Prefabricated bridge component production process

Abstract

The invention discloses a prefabricated bridge component production process which comprises the following steps: S1, before a mold is manufactured, firstly building a base assembly on the ground, and arranging a fastening assembly; s2, according to a prefabricated bridge component drawing, a mold assembly and a cover plate assembly are manufactured through materials, and meanwhile in the mold manufacturing process, raw materials are prepared and mixed; s3, the mold assembly manufactured in the step 2 is installed on the base assembly and the fastening assembly according to the placing requirement, then a steel strand is pulled in the mold assembly, the two ends of the steel strand are fixed through bolts, then the fastening assembly is operated to press the steel strand, after pressing is finished, the fastening assembly is disassembled, and the procedure operation of binding steel bars is conducted; the prefabricated bridge member production process designed by the invention is simple in steps and relatively simple to operate during production, can meet the purpose of rapid production of prefabricated bridge members, can adapt to production of various bridge members, and ensures the quality of the bridge members.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated bridge components, and in particular to a production process of prefabricated bridge components. Background Art

[0002] Bridge components usually have two construction processes: cast-in-place and prefabrication. Compared with cast-in-place bridge components, prefabricated components have the advantages of low cost, fast construction speed, less impact of concrete shrinkage on bridge structure, and standardized production. Bridge components include piers, abutments, and box girders, etc. The production steps of bridge components are usually casting, curing, and demoulding.

[0003] For example, a production process for prefabricated bridge components with an authorization announcement number of CN202310307881.0 and an authorization announcement date of 20231024 has the following technical problems: during pouring, the gas inside the concrete and the heat generated cannot be discharged in time, and the accumulated heat is too high, which will affect the quality of concrete molding, and will cause the concrete to fall on the surface of the steel bars that need to be welded, thereby affecting welding, and during maintenance, it is difficult to maintain all parts of the prefabricated components. The technical solution is: a production process for prefabricated bridge components, including a lifting frame, a bottom mold and a side mold, etc.; a bottom mold is placed under the lifting frame; and two side molds are installed on the bottom mold. During pouring and vibration, the present invention can discharge the internal gas in time, and at the same time, it can also keep the temperature of the internal concrete stable to avoid excessive temperature and affect the quality of concrete molding. At the same time, the present invention can evenly maintain all parts of the prefabricated components, thereby ensuring the quality of the prefabricated components.

[0004] The traditional production process of prefabricated bridge components is relatively complicated and requires a lot of time and effort to operate. It cannot meet the purpose of rapid production of prefabricated bridge components and cannot guarantee the quality of the components. Therefore, it is urgent to design a prefabricated bridge component production process to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a prefabricated bridge component production process to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A prefabricated bridge component production process, the prefabricated bridge component production process is based on production equipment, including a base assembly, a mold assembly, a cover assembly and a fastening assembly, the mold assembly is arranged above the base assembly, the fastening assembly is arranged on the base assembly, the mold assembly is sleeved between two fastening assemblies, the cover assembly is sleeved between two fastening assemblies, and the fastening assembly is placed inside the mold assembly;

[0008] The prefabricated bridge component production process comprises the following steps:

[0009] S1. Before making the mold, first build the base assembly on the ground and set up the fastening assembly;

[0010] S2. According to the drawings of the prefabricated bridge components, the mold assembly and the cover assembly are made of materials. During the mold making process, the raw materials are prepared and mixed;

[0011] S3. Install the mold assembly prepared in the above steps on the base assembly and the fastening assembly according to the placement requirements, then pull the steel strand in the mold assembly, and fix the two ends of the steel strand with bolts, and then operate the fastening assembly to press the steel strand. After the pressing is completed, disassemble the fastening assembly and perform the process of tying the steel bars;

[0012] S4. Pour part of the material prepared in step S1 into the prepared mold assembly, then operate the equipment on the cover assembly to remove bubbles from the material, and then repeat the above steps for 3-4 times of pouring. After the pouring is completed, wait for a period of time and then perform shaping treatment. After shaping, remove the fastening components, use tools to cut the steel strands, and finally use the crane equipment to lift out the finished product.

[0013] Furthermore, in step S2, the raw materials are four kinds of concrete, steel fiber, fiber reinforced plastic, and cement-based composite material, and the mixing is carried out using the following process:

[0014] (1) Computer-controlled metering is used to add premixed concrete from the top of the mixer, and the mixer is dry-mixed at low speed for 3 minutes;

[0015] (2) Add special admixtures for cement-based composite materials and water, and stir at low speed for 3-5 minutes;

[0016] (3) Sprinkle steel fibers and fiber-reinforced plastics and stir at high speed for 2 minutes. The sprinkling process should be slow to ensure the uniformity of the fibers in the stirred material.

[0017] Furthermore, the base assembly is used to provide downward pulling force for subsequent ground anchors, and the base assembly includes a cement seat, which is formed by casting cement. The outer walls on both sides of the top of the cement seat are provided with grooves, and the bottom of the inner wall of the groove is installed with a foundation member by bolts, and the outer walls on both sides of the top of the foundation member are provided with two mounting holes, and the mounting holes are used to accommodate fixing nuts.

[0018] Furthermore, the fastening assembly is used to press the steel strand, and the fastening assembly includes four threaded steel fixing rods, the threaded steel fixing rods are fixed inside the mounting hole, and a lower baffle is slidably sleeved between the four threaded steel fixing rods.

[0019] Furthermore, a middle baffle is slidably sleeved between the four threaded steel fixing rods, a steel pipe sleeve is sleeved outside the threaded steel fixing rods, and the steel pipe sleeve is located between the middle baffle and the lower baffle.

[0020] Furthermore, the outer thread of the threaded steel fixing rod is connected with a middle baffle nut, and the bottom end of the middle baffle nut is arranged on the outer wall of the top of the middle baffle.

[0021] Furthermore, an upper baffle is slidably sleeved between the four threaded steel fixing rods, and a jack is installed between the upper baffle and the middle baffle via bolts.

[0022] Furthermore, the outer thread of the threaded steel fixing rod is connected with an upper baffle nut, and the bottom end of the upper baffle nut is arranged on the top outer wall of the upper baffle.

[0023] Furthermore, the mold assembly is used to shape the poured concrete, and the mold assembly includes a mold body, which is slidably sleeved between four threaded steel fixing rods, and side plates are installed on the outer walls on both sides of the top of the mold body by bolts, and fixing plates are installed on the outer walls on both sides of the mold body by bolts, and two groups of steel strands are inserted into the outer wall on one side of the fixing plate.

[0024] Furthermore, the cover plate assembly is used to cover the top of the mold assembly, and the cover plate assembly includes a lower pressure plate, which is fixed together with the middle baffle plate, and the outer walls on both sides of the top of the lower pressure plate are provided with through holes, and the threaded steel fixing rod passes through the through holes, and the outer walls on both sides of the top of the lower pressure plate are equipped with multiple mounting tubes by bolts, and a transducer is provided inside the mounting tube, and the transducer passes through the lower pressure plate, and a fixing tube is provided between the multiple mounting tubes, and a connecting wire is provided at one end of the fixing tube, and the connecting wire is electrically connected to the multiple transducers.

[0025] In the above technical solution, the present invention provides a prefabricated bridge component production process, which has the following beneficial effects:

[0026] (1) The production process steps of the prefabricated bridge components designed by the present invention are simple, and the operation during production is relatively simple, which can meet the purpose of rapid production of prefabricated bridge components. In addition, the production process can adapt to the production of various bridge components and ensure the quality of bridge components.

[0027] (2) The steel fibers and fiber-reinforced plastics used in the present invention can strengthen the strength of the components and ensure the quality of the components. At the same time, the addition of cement-based composite materials can reduce the material usage by about 30%-60%, which is in line with the concept of resource conservation and industrialized construction under the background of "dual carbon" and can ensure material strength and construction coordination.

[0028] (3) The present invention can remove bubbles in the material as much as possible through multiple pouring and processing of the cover plate assembly, thereby ensuring the quality of the component after molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0030] Figure 1 A schematic diagram of a method flow chart of a prefabricated bridge component production process embodiment of the present invention.

[0031] Figure 2 A schematic diagram of the structures of a base assembly, a mold assembly, etc. provided for an embodiment of a prefabricated bridge component production process of the present invention.

[0032] Figure 3 A schematic diagram of the base assembly structure provided for an embodiment of a prefabricated bridge component production process of the present invention.

[0033] Figure 4 A schematic diagram of the structure of a mold assembly provided for an embodiment of a prefabricated bridge component production process of the present invention.

[0034] Figure 5 A schematic diagram of the structure of a cover plate assembly provided for an embodiment of a process for producing a prefabricated bridge component according to the present invention.

[0035] Figure 6 A schematic diagram of the structure of a fastening assembly provided for an embodiment of a prefabricated bridge component production process of the present invention.

[0036] Description of reference numerals:

[0037] 1. Base assembly; 2. Mold assembly; 3. Cover assembly; 4. Fastening assembly; 5. Cement seat; 6. Groove; 7. Basic parts; 8. Mounting holes; 9. Mold body; 10. Side panels; 11. Fixed plates; 12. Lower pressure plates; 13. Through holes; 14. Transducer; 15. Mounting tube; 16. Fixed tube; 17. Connecting wire; 18. Threaded steel fixing rod; 19. Lower baffle; 20. Steel pipe sleeve; 21. Middle baffle; 22. Middle baffle nut; 23. Jack; 24. Upper baffle; 25. Upper baffle nut; 26. Steel strand. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-6As shown, a prefabricated bridge component production process provided by an embodiment of the present invention is based on a production device and includes a base assembly 1, a mold assembly 2, a cover assembly 3 and a fastening assembly 4. The mold assembly 2 is arranged above the base assembly 1, the fastening assembly 4 is arranged on the base assembly 1, the mold assembly 2 is sleeved between two fastening assemblies 4, the cover assembly 3 is sleeved between two fastening assemblies 4, and the fastening assembly 4 is placed inside the mold assembly 2;

[0040] The production process of prefabricated bridge components includes the following steps:

[0041] S1. Before making the mold, first build the base assembly 1 on the ground and set the fastening assembly 4;

[0042] S2. According to the drawings of the prefabricated bridge components, the mold assembly 2 and the cover assembly 3 are made of materials. During the mold making process, the raw materials are prepared and mixed;

[0043] S3. Install the mold assembly 2 prepared in the above steps on the base assembly 1 and the fastening assembly 4 according to the placement requirements, then pull the steel strand 26 in the mold assembly 1, and fix the two ends of the steel strand 26 with bolts, and then operate the fastening assembly 4 to press the steel strand 26. After the pressing is completed, disassemble the fastening assembly 4 and perform the process of tying the steel bars;

[0044] S4. Pour part of the material prepared in step S1 into the prepared mold assembly 1, then operate the equipment on the cover assembly 3 to remove bubbles from the material, and then repeat the above steps for 3-4 times of pouring. After the pouring is completed, wait for a period of time and then perform shaping treatment. After the shaping is completed, remove the fastening assembly 4, and use tools to cut the steel strand 26, and finally use a crane to lift out the finished product.

[0045] Specifically, in this embodiment, the production process of the prefabricated bridge component is based on the production equipment, including a base assembly 1, a mold assembly 2, a cover assembly 3 and a fastening assembly 4, the mold assembly 2 is arranged above the base assembly 1, the fastening assembly 4 is arranged on the base assembly 1, the mold assembly 2 is sleeved between two fastening assemblies 4, the cover assembly 3 is sleeved between two fastening assemblies 4, and the fastening assembly 4 is placed inside the mold assembly 2;

[0046] The production process of prefabricated bridge components includes the following steps:

[0047] S1. Before making the mold, first build the base assembly 1 on the ground and set the fastening assembly 4;

[0048] S2. According to the prefabricated bridge component drawings, the mold assembly 2 and the cover assembly 3 are made of materials. During the mold making process, raw materials are prepared and mixed. The raw materials are four types: concrete, steel fiber, fiber reinforced plastic, and cement-based composite materials. The mixing process is as follows:

[0049] (1) Computer-controlled metering is used to add premixed concrete from the top of the mixer, and the mixer is dry-mixed at low speed for 3 minutes;

[0050] (2) Add special admixtures for cement-based composite materials and water and stir at low speed for 5 minutes;

[0051] (3) Sprinkle steel fiber and fiber reinforced plastic and stir at high speed for 2 minutes. The sprinkling process should be slow to ensure the uniformity of the fibers in the stirred material.

[0052] S3. Install the mold assembly 2 prepared in the above steps on the base assembly 1 and the fastening assembly 4 according to the placement requirements, then pull the steel strand 26 in the mold assembly 1, and fix the two ends of the steel strand 26 with bolts, and then operate the fastening assembly 4 to press the steel strand 26. After the pressing is completed, disassemble the fastening assembly 4 and perform the process of tying the steel bars;

[0053] S4. Pour part of the material prepared in step S1 into the prepared mold assembly 1, then operate the equipment on the cover assembly 3 to remove bubbles from the material, and then repeat the above steps for 4 pouring. After the pouring is completed, wait for a period of time and then perform shaping treatment. After the shaping is completed, remove the fastening assembly 4, and use tools to cut the steel strand 26, and finally use a crane to lift out the finished product.

[0054] The present invention provides a prefabricated bridge component production process. The designed prefabricated bridge component production process has simple steps and is relatively simple to operate during production, which can meet the purpose of rapid production of prefabricated bridge components. In addition, the production process can adapt to the production of various bridge components and ensure the quality of bridge components.

[0055] In one embodiment provided by the present invention, Figure 2-5As shown, the base assembly 1 is used to provide a downward pulling force for the subsequent ground anchor, and the base assembly 1 includes a cement seat 5, which is formed by pouring cement, and the outer walls on both sides of the top of the cement seat 5 are provided with grooves 6, and the bottom of the inner wall of the groove 6 is installed with a base member 7 by bolts, and the outer walls on both sides of the top of the base member 7 are provided with two mounting holes 8, and the mounting holes 8 are used to receive fixing nuts; the fastening assembly 4 is used to suppress the steel strand 26, and the fastening assembly 4 includes four threaded steel fixing rods 18, and the threaded steel fixing rods 18 are fixed inside the mounting holes 8. A lower baffle plate 19 is slidably sleeved between the four threaded steel fixing rods 18, and the lower baffle plate 19 is left in the concrete during pouring, which can improve the strength of the product; four A middle baffle 21 is slidably sleeved between the four threaded steel fixing rods 18, a steel pipe sleeve 20 is sleeved on the outside of the threaded steel fixing rod 18, and the steel pipe sleeve 20 is located between the middle baffle 21 and the lower baffle 19; the middle baffle nut 22 is threadedly connected to the outside of the threaded steel fixing rod 18, and the bottom end of the middle baffle nut 22 is set on the top outer wall of the middle baffle 21; an upper baffle 24 is slidably sleeved between the four threaded steel fixing rods 18, and a jack 23 is installed between the upper baffle 24 and the middle baffle 21 through bolts. By operating the jack 23, the position of the middle baffle 21 can be lowered, so that the steel pipe sleeve 20 presses down the lower baffle 19. At the same time, operating the jack 23 can realize the steel strand 26 Pressing; the outer thread of the threaded steel fixing rod 18 is connected with the upper baffle nut 25, and the bottom end of the upper baffle nut 25 is set on the outer wall of the top of the upper baffle 24; the mold assembly 2 is used to shape the poured concrete, and the mold assembly 2 includes a mold body 9, and the mold body 9 is slidably sleeved between four threaded steel fixing rods 18. The outer walls on both sides of the top of the mold body 9 are installed with side plates 10 by bolts, and the outer walls on both sides of the mold body 9 are installed with fixing plates 11 by bolts, and two groups of steel strands 26 are inserted into the outer wall of one side of the fixing plate 11, and the number of steel strands 26 in one group is 21, which is not a fixed number; the cover assembly 3 is used to cover the top of the mold assembly 2, and the cover assembly 3 includes a lower The pressure plate 12, the lower pressure plate 12 and the middle baffle plate 21 are fixed together, through holes 13 are opened on the outer walls on both sides of the top of the lower pressure plate 12, and the threaded steel fixing rods 18 pass through the through holes 13. The outer walls on both sides of the top of the lower pressure plate 12 are equipped with multiple mounting tubes 15 by bolts, and a transducer 14 is arranged inside the mounting tube 15. The transducer 14 passes through the lower pressure plate 12, and a fixing tube 16 is arranged between the multiple mounting tubes 15, and a connecting line 17 is arranged at one end of the fixing tube 16. The connecting line 17 is connected to the ultrasonic generator. When the transducer 14 is started, the cast material can be vibrated to remove bubbles, and the connecting line 17 is electrically connected to the multiple transducers 14.

[0056] Working principle: Before making the mold, first build a base assembly 1 on the ground. In this process, cement can be poured on the ground to form a cement seat 5, and then the prepared base member 7 can be fixed inside the groove 6, and then the fixing nut can be installed inside the mounting hole 8, and then the four threaded steel fixing rods 18 can be installed inside the mounting hole 8, and then the mold body 9 can be sleeved on the outside of the four threaded steel fixing rods 18, and then the prepared side panels 10 and fixing plates 11 are fixed on the mold body 9 to form the mold, and then the prepared lower baffle 19, steel pipe sleeve 20, middle baffle 21 and upper baffle 24 are installed on the threaded steel fixing rod 18, and the jack 23 can be installed between the upper baffle 24 and the middle baffle 21, and then the steel strand 26 is pulled in the mold assembly 1, and the two ends of the steel strand 26 are fixed with bolts, and then the fastening assembly 4 is operated to press the steel strand 26. After the pressing is completed, disassemble it. Fasten the assembly 4 and perform the process of tying the steel bars. During the installation process, raw materials can be prepared and mixed. The mixing process can first be controlled by computer and the premixed concrete is added from the top of the mixer. The mixer is dry mixed at low speed for 3 minutes. Subsequently, special admixtures and water for cement-based composite materials are added and stirred at low speed for 5 minutes. Then, steel fibers and fiber-reinforced plastics are sprinkled in and stirred at high speed for 2 minutes. The sprinkling process should be slow to ensure the uniformity of the fibers in the mixed material. After subsequent pouring, a pouring device can be used to pour a part of the prepared material into the prepared mold assembly 1, and then the equipment on the cover assembly 3 is operated to remove bubbles from the material. Then the above steps are repeated for 4 pourings. After the pouring is completed, it is waited for a period of time to perform shaping. After the shaping is completed, the fastening assembly 4 is removed, and the steel strand 26 is cut using tools. Finally, the finished product is lifted out using a crane.

[0057] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A production process for prefabricated bridge components, characterized in that: The prefabricated bridge component production process is based on production equipment and comprises a base assembly (1), a mold assembly (2), a cover assembly (3) and a fastening assembly (4), wherein the mold assembly (2) is arranged above the base assembly (1), the fastening assembly (4) is arranged on the base assembly (1), the mold assembly (2) is sleeved between two fastening assemblies (4), the cover assembly (3) is sleeved between two fastening assemblies (4), and the fastening assembly (4) is placed inside the mold assembly (2); The prefabricated bridge component production process comprises the following steps: S1. Before making the mold, first build the base assembly (1) on the ground and set the fastening assembly (4); S2. According to the drawings of the prefabricated bridge components, the mold assembly (2) and the cover assembly (3) are made of materials. During the mold making process, the raw materials are prepared and mixed; S3. The mold assembly (2) prepared in the above steps is installed on the base assembly (1) and the fastening assembly (4) according to the placement requirements, and then the steel strand (26) is pulled in the mold assembly (1), and the two ends of the steel strand (26) are fixed with bolts, and then the fastening assembly (4) is operated to press the steel strand (26). After the pressing is completed, the fastening assembly (4) is disassembled and the process of tying the steel bars is carried out; S4. Pour a portion of the material prepared in step S1 into the prepared mold assembly (1), then operate the equipment on the cover assembly (3) to remove bubbles from the material, and then repeat the above steps for 3-4 times of pouring. After the pouring is completed, wait for a period of time and then perform shaping. After the shaping is completed, remove the fastening assembly (4), use tools to cut the steel strand (26), and finally use a crane to lift out the finished product.

2. A prefabricated bridge component production process according to claim 1, characterized in that: The raw materials in step S2 are four types: concrete, steel fiber, fiber reinforced plastic, and cement-based composite material, and the mixing process is as follows: (1) Computer-controlled metering is used to add premixed concrete from the top of the mixer, and the mixer is dry-mixed at low speed for 3 minutes; (2) Add special admixtures for cement-based composite materials and water, and stir at low speed for 3-5 minutes; (3) Sprinkle steel fibers and fiber-reinforced plastics and stir at high speed for 2 minutes. The sprinkling process should be slow to ensure the uniformity of the fibers in the stirred material.

3. The production process of a prefabricated bridge component according to claim 1, characterized in that: The base assembly (1) is used to provide a downward pulling force for a subsequent ground anchor, and the base assembly (1) comprises a cement seat (5), wherein the cement seat (5) is formed by casting cement, and grooves (6) are provided on the outer walls on both sides of the top of the cement seat (5), and a base member (7) is installed at the bottom of the inner wall of the groove (6) by bolts, and two mounting holes (8) are provided on the outer walls on both sides of the top of the base member (7), and the mounting holes (8) are used to receive fixing nuts.

4. A prefabricated bridge component production process according to claim 1, characterized in that: The fastening assembly (4) is used to press the steel strand (26), and the fastening assembly (4) comprises four threaded steel fixing rods (18), the threaded steel fixing rods (18) are fixed inside the mounting hole (8), and a lower baffle (19) is slidably sleeved between the four threaded steel fixing rods (18).

5. A prefabricated bridge component production process according to claim 4, characterized in that: A middle baffle (21) is slidably sleeved between the four threaded steel fixing rods (18), a steel pipe sleeve (20) is sleeved outside the threaded steel fixing rods (18), and the steel pipe sleeve (20) is located between the middle baffle (21) and the lower baffle (19).

6. A prefabricated bridge component production process according to claim 5, characterized in that: The outer thread of the threaded steel fixing rod (18) is connected to a middle baffle nut (22) through threads, and the bottom end of the middle baffle nut (22) is arranged on the top outer wall of the middle baffle (21).

7. The production process of a prefabricated bridge component according to claim 5, characterized in that: An upper baffle plate (24) is slidably sleeved between the four threaded steel fixing rods (18), and a jack (23) is installed between the upper baffle plate (24) and the middle baffle plate (21) via bolts.

8. A prefabricated bridge component production process according to claim 7, characterized in that: The outer surface of the threaded steel fixing rod (18) is threadedly connected to an upper baffle nut (25), and the bottom end of the upper baffle nut (25) is arranged on the top outer wall of the upper baffle (24).

9. A prefabricated bridge component production process according to claim 4, characterized in that: The mold assembly (2) is used to shape the poured concrete, and the mold assembly (2) comprises a mold body (9), the mold body (9) is slidably sleeved between four threaded steel fixing rods (18), side plates (10) are installed on the outer walls on both sides of the top of the mold body (9) by bolts, and fixing plates (11) are installed on the outer walls on both sides of the mold body (9) by bolts, and two groups of steel strands (26) are inserted into the outer wall of one side of the fixing plate (11).

10. A prefabricated bridge component production process according to claim 4, characterized in that: The cover plate assembly (3) is used to cover the top of the mold assembly (2). The cover plate assembly (3) includes a lower pressure plate (12). The lower pressure plate 12 is fixed together with a middle baffle (21). The outer walls on both sides of the top of the lower pressure plate (12) are provided with through holes (13). The threaded steel fixing rod (18) passes through the through holes (13). The outer walls on both sides of the top of the lower pressure plate (12) are provided with multiple mounting tubes (15) by bolts, and a transducer (14) is provided inside the mounting tube (15). The transducer (14) passes through the lower pressure plate (12). A fixing tube (16) is provided between the multiple mounting tubes (15), and a connecting wire (17) is provided at one end of the fixing tube (16). The connecting wire (17) is electrically connected to the multiple transducers (14).

Images