CN114960457A - Split type steel bridge hoisting horizontal interval fine adjustment device and construction method - Google Patents
Split type steel bridge hoisting horizontal interval fine adjustment device and construction method Download PDFInfo
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- CN114960457A CN114960457A CN202210768048.1A CN202210768048A CN114960457A CN 114960457 A CN114960457 A CN 114960457A CN 202210768048 A CN202210768048 A CN 202210768048A CN 114960457 A CN114960457 A CN 114960457A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000003466 welding Methods 0.000 claims abstract description 24
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 230000000712 assembly Effects 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 210000005056 cell body Anatomy 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention provides a piece-separating steel bridge hoisting horizontal interval fine-tuning device and a construction method, wherein the piece-separating steel bridge hoisting horizontal interval fine-tuning device comprises a positioning assembly, an adjusting assembly and a limiting assembly, the positioning assembly is symmetrically arranged near the adjacent end surfaces of a fixed beam body and a beam body to be fixed, the adjusting assembly and the fixed beam body surface are parallelly and penetratingly connected with the positioning assembly, the limiting assembly is detachably arranged on the penetrating surface of the positioning assembly, the adjusting assembly and the limiting assembly can be matched to realize the adjustment of the interval between the fixed beam body and the beam body to be fixed, and the limiting assembly is detachably connected with the adjusting assembly. The spacing assembly is matched with the adjusting assembly to form an effective spacing adjusting mechanism, the adjusting precision of the adjusting assembly is guaranteed, and spacing fine adjustment control is achieved. The invention is suitable for the working condition of lifting the split type beam body, realizes fine adjustment control of the distance, ensures the width of a welding seam, has simple structure, convenient assembly and disassembly and strong practicability, can ensure the construction quality, improves the construction efficiency and shortens the construction period.
Description
Technical Field
The invention belongs to the technical field of steel structure bridge construction, and particularly relates to a device for finely adjusting the hoisting horizontal spacing of a segmented steel bridge and a construction method.
Background
In recent years, with the development of urban economy and culture, the requirements of people on bridge landscape are gradually improved, steel structure bridges are more and more, the steel structure bridges are widely used due to various variability, the steel box girder hoisting and welding process is a key process, therefore, the welding seam interval control and the construction efficiency during the steel box girder hoisting are particularly important for the whole steel structure bridge engineering construction, the common simple guy rope is used for traction construction in the prior art, but the size of the welding seam width cannot be ensured due to the difficulty in fine adjustment during the guy rope traction, and certain difficulty exists in construction, so a new construction technology for fine adjustment of the interval is necessary to be researched.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the horizontal distance fine-tuning device for hoisting the split-type steel bridge and the construction method, which are applicable to the working condition of hoisting the split-type beam body, realize the fine-tuning control of the distance, ensure the width of a welding seam, have simple structure, convenient assembly and disassembly and strong practicability, can ensure the construction quality, improve the construction efficiency and shorten the construction period.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a horizontal interval micromatic setting of burst formula steel bridge hoist and mount, includes locating component, adjusting part and spacing subassembly, the locating component symmetry sets up in fixed roof beam body and treats near fixed roof beam body adjacent end surface, adjusting part and fixed roof beam body surface parallel ground through connection locating component, spacing subassembly detachably installs in the locating component face of running through, adjusting part and spacing subassembly can cooperate the realization fixed roof beam body and treat fixed roof beam body interval regulation, just spacing subassembly and adjusting part can dismantle and be connected.
Further, the adjusting part is the external screw thread pole, the external screw thread pole surface includes that two sections intervals set up and have the first screw thread section and the second screw thread section of certain length, first screw thread section and second screw thread section are corresponding to fixed roof beam body respectively and treat the fixed locating component that roof beam body symmetry set up, just first screw thread section is different with second screw thread section screw thread, first screw thread section is the straight thread, the second screw thread section is the inclined wire screw thread, spacing subassembly include with first screw thread section and second screw thread section screw thread complex first internal thread sleeve and second internal thread sleeve. The straight thread corresponds the fixed roof beam body, the fixed roof beam body is treated in the inclined thread correspondence, it is rotatory through at fixed roof beam body one end control external screw thread pole, make external screw thread pole reach the effect of "rotatable nothing displacement" at fixed roof beam body side, and treat fixed roof beam body side because inclined screw thread and the matching of second internal thread sleeve screw thread, and second internal thread sleeve is connected fixedly with this side locating component, and then treat fixed roof beam body and form and pull, make and treat that fixed roof beam body realizes the interval fine setting under the pulling of device, guarantee the welding seam width, guarantee construction quality, thereby it is fixed to adopt the mode of screw rod cooperation muffjoint to replace the welding seam connection to carry out the roof beam body, reducible power consumption and welding, multiplicable efficiency of construction.
Furthermore, the one end of first internal thread sleeve and second internal thread sleeve has the fixed otic placode of outside extension, spacing subassembly passes fixed otic placode and locating component run-through surface through the bolt and can dismantle the connection. Through being connected spacing subassembly tip and locating component fixed for the external screw thread pole can realize the rotatable nothing displacement of one end, and the other end is rotatory carries out towed effect, thereby realizes the fine setting of roof beam body interval fast, guarantees that the welding seam width is controllable, can promote the efficiency of construction, shortens construction period.
Further, first internal thread sleeve and second internal thread sleeve all are cylinder formula structure, cylinder formula structure is formed by the butt joint of two relative semicircle arcs of opening, and two semicircle arc is first relative the limit articulated through fixed rotating shaft, and another relative limit passes through the buckle and can open and shut the connection, cylinder formula structure includes corresponding internal thread. Fixed otic placode sets up in the same one end of two semicircle arcs, and the drum formula structure can open and shut, makes things convenient for spacing subassembly to dismantle reuse to and adjusting component's dismouting, can realize device quick assembly disassembly, repeatedly usable, and the practicality is strong.
Further, the externally threaded rod includes a detachable rotating handle assembly near one end of the fixed beam. The rotating handle assembly is arranged on one side far away from the beam body to be fixed, and the rotating handle is screwed to quickly realize fine adjustment of the distance so as to control the width of a welding seam and facilitate repeated utilization or recovery in a detachable connection mode.
Further, the handle subassembly rotates includes the twist grip and the handle linkage segment of Z type, twist grip one end is used for the gripping, and the other end includes inside sunken cell body, handle linkage segment integrated into one piece ground sets up in external screw rod tip position along the axial, handle linkage segment surface and twist grip cell body gomphosis joint. The rotating handle can be detached for recycling, when one external threaded rod is effectively fixed, the rotating handle can be pulled away to fix other screws, and the practicability is high.
Further, the handle connecting section is of an outer hexagonal structure, and the groove body is an inner hexagonal groove body. The outer hexagonal structure is matched with the inner hexagonal groove body to form a rotating system, so that the rotation of the adjusting assembly is conveniently controlled, and the device is simple and practical.
Furthermore, the positioning assembly is a perforated angle steel, two vertical surfaces of the perforated angle steel are provided with through holes for accommodating the adjusting assemblies to penetrate through, and two sides of each penetrating surface are provided with limiting assemblies.
Furthermore, the positioning assemblies are arranged in a plurality of groups at intervals along the width direction of the beam body.
The invention also designs a construction method of the horizontal spacing fine adjustment device for hoisting the sectional steel bridge, which comprises the following steps:
1) preprocessing and manufacturing the adjusting assembly and the limiting assembly;
2) welding positioning components at the corners of the adjacent ends of the top plates of the fixed beam body and the beam body to be fixed respectively to ensure the positions of the positioning components to be symmetrical;
3) the adjusting assembly penetrates through the symmetrical positioning assemblies to ensure that the positioning assemblies are positioned in the adjusting range of the adjusting assembly;
4) the limiting assembly is arranged at the position, close to the through surface of the positioning assembly, of the adjusting assembly, and the limiting assembly and the positioning assembly are fixedly arranged;
5) and the control adjusting assembly works to adjust the position of the beam body to be fixed to be close to or far away from the fixed beam body.
Compared with the prior art, the invention has the beneficial effects that:
the invention is suitable for the working condition of lifting the split type beam body, realizes the fine adjustment control of the distance, ensures the width of a welding seam, has simple structure, convenient assembly and disassembly and strong practicability, can ensure the construction quality, improves the construction efficiency and shortens the construction period. Aiming at the hoisting working condition of the split type beam body, a positioning assembly is arranged at the adjacent end of the fixed beam body and the beam body to be fixed, and is used for conveniently installing an adjusting assembly, the adjusting assembly and the positioning assembly form an -shaped structure after being installed, so that the beam body to be fixed can stably and controllably move in the distance adjusting process, the difficulty in the prior art caused by the traction of a cable rope is overcome, an effective distance adjusting mechanism is formed by matching a limiting assembly with the adjusting assembly, the adjusting precision of the adjusting assembly is ensured, the distance fine adjustment control is realized, the controllable width of a welding seam can be ensured through the matching of the limiting assembly and the adjusting assembly, the construction quality is ensured, and the construction efficiency is improved; the detachable connection relation is formed between the positioning assembly and the beam body, between the adjusting assembly and the positioning assembly, between the limiting assembly and the adjusting assembly, between the adjusting assembly and the limiting assembly, the detachable connection relation is convenient to disassemble and assemble, and the detachable connection relation can be repeatedly utilized, effectively reduces material waste, and is high in practicability, economical and practical.
Drawings
FIG. 1 is a reference diagram for use with the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
FIG. 3 is a schematic view of a cylindrical structure according to the present invention.
The device comprises a fixed beam body 1, a beam body to be fixed 2, a positioning assembly 3, an adjusting assembly 4, a first thread section 41, a second thread section 42, a limiting assembly 5, a first internal thread sleeve 51, a second internal thread sleeve 52, a fixed lug plate 53, a fixed rotating shaft 54, a rotating handle assembly 6, a rotating handle 61 and a handle connecting section 62.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
The horizontal interval fine-tuning device for hoisting of the split-type steel bridge shown in the figure comprises a positioning component 3, an adjusting component 4 and a limiting component 5, wherein the positioning component 3 is symmetrically arranged near the surface of the adjacent end of a fixed beam body 1 and a beam body 2 to be fixed, the adjusting component 4 is parallelly connected with the surface of the fixed beam body 1 in a penetrating manner and is connected with the positioning component 3, the limiting component 5 is detachably installed on the penetrating surface of the positioning component 3, the adjusting component 4 and the limiting component 5 can be matched to realize the interval adjustment of the fixed beam body 1 and the beam body 2 to be fixed, and the limiting component 5 and the adjusting component 4 can be detachably connected. Aiming at the working condition of hoisting the split beam body, a positioning assembly is arranged at the adjacent end of the fixed beam body and the beam body to be fixed and is used for conveniently installing an adjusting assembly, the adjusting assembly and the positioning assembly form an -shaped structure after being installed, so that the beam body to be fixed can stably and controllably move in the process of adjusting the distance, the difficulty in the prior art caused by the traction of a cable wind rope is overcome, an effective distance adjusting mechanism is formed by matching a limiting assembly with the adjusting assembly, the adjusting precision of the adjusting assembly is ensured, the distance fine adjustment control is realized, the controllable width of a welding line can be ensured through the matching of the limiting assembly and the adjusting assembly, the construction quality is ensured, and the construction efficiency is improved; the detachable connection relation is formed between the positioning assembly and the beam body, between the adjusting assembly and the positioning assembly, between the limiting assembly and the adjusting assembly, between the adjusting assembly and the limiting assembly, the detachable connection relation is convenient to disassemble and assemble, the materials can be effectively reduced, the materials are wasted, the practicability is high, and the detachable connection relation is economical and practical. The invention is suitable for the working condition of lifting the split type beam body, realizes the fine adjustment control of the distance, ensures the width of a welding seam, has simple structure, convenient assembly and disassembly and strong practicability, can ensure the construction quality, improves the construction efficiency and shortens the construction period.
Preferably, the adjusting component 4 is an external thread rod, the surface of the external thread rod comprises two first thread sections 41 and two second thread sections 42 which are arranged at intervals and have a certain length, the first thread sections 41 and the second thread sections 42 respectively correspond to the positioning components 3 which are symmetrically arranged on the fixed beam body 1 and the beam body 2 to be fixed, the first thread sections 41 and the second thread sections 42 are different in thread, the first thread sections 41 are straight threads, the second thread sections 41 are oblique threads, and the limiting component 5 comprises a first internal thread sleeve 51 and a second internal thread sleeve 52 which are in threaded fit with the first thread sections 41 and the second thread sections 42. The straight thread corresponds the fixed roof beam body, the fixed roof beam body is treated in the inclined thread correspondence, it is rotatory through at fixed roof beam body one end control external screw thread pole, make external screw thread pole reach the effect of "rotatable nothing displacement" at fixed roof beam body side, and treat fixed roof beam body side because inclined screw thread and the matching of second internal thread sleeve screw thread, and second internal thread sleeve is connected fixedly with this side locating component, and then treat fixed roof beam body and form and pull, make and treat that fixed roof beam body realizes the interval fine setting under the pulling of device, guarantee the welding seam width, guarantee construction quality, thereby it is fixed to adopt the mode of screw rod cooperation muffjoint to replace the welding seam connection to carry out the roof beam body, reducible power consumption and welding, multiplicable efficiency of construction.
Preferably, one end of the first and second internally threaded sleeves 51 and 52 is provided with an outwardly extending fixing lug plate 53, and the limiting assembly 5 is detachably connected with the through surface of the positioning assembly 3 by a bolt passing through the fixing lug plate 53. Through being connected spacing subassembly tip and locating component fixed for the external screw thread pole can realize the rotatable nothing displacement of one end, and the other end is rotatory carries out towed effect, thereby realizes the fine setting of roof beam body interval fast, guarantees that the welding seam width is controllable, can promote the efficiency of construction, shortens construction period.
Preferably, the first internal thread sleeve 51 and the second internal thread sleeve 52 are both cylindrical structures, each cylindrical structure is formed by butting two semicircular arc plates with opposite openings, one opposite sides of the two semicircular arc plates are hinged through a fixed rotating shaft 54, the other opposite sides of the two semicircular arc plates are connected in an openable and closable manner through a buckle, and each cylindrical structure comprises corresponding internal threads. Fixed otic placode sets up in the same one end of two semicircle arcs, and the drum formula structure can open and shut, makes things convenient for spacing subassembly to dismantle reuse to and adjusting component's dismouting, can realize device quick assembly disassembly, repeatedly usable, and the practicality is strong.
Preferably, the externally threaded rod includes a detachable turning handle assembly 6 near one end of the fixed beam 1. The rotating handle assembly is arranged on one side far away from the beam body to be fixed, and the rotating handle is screwed to quickly realize fine adjustment of the distance so as to control the width of a welding seam and facilitate repeated utilization or recovery in a detachable connection mode.
Preferably, the turning handle assembly 6 comprises a Z-shaped turning handle 61 and a handle connecting section 62, one end of the turning handle 61 is used for grasping, the other end of the turning handle comprises an inward concave groove, the handle connecting section 62 is integrally and axially arranged at the end position of the external thread rod, and the surface of the handle connecting section 62 is in embedded joint with the groove of the turning handle 61. The rotating handle can be detached for recycling, when one external threaded rod is effectively fixed, the rotating handle can be pulled away to fix other screws, and the practicability is high.
Preferably, the handle connecting section 62 is an external hexagonal structure, and the groove body is an internal hexagonal groove body. The outer hexagonal structure is matched with the inner hexagonal groove body to form a rotating system, so that the rotation of the adjusting assembly is conveniently controlled, and the device is simple and practical.
As the preferred, locating component 3 is foraminiferous angle steel, and two perpendicular planes of foraminiferous angle steel all have the through-hole that holds adjusting part 4 and run through, and run through the face both sides and all set up spacing subassembly 5.
Preferably, the positioning assemblies 3 are arranged in a plurality of groups at intervals along the width direction of the beam body.
The invention also provides a construction method of the horizontal distance fine-tuning device for hoisting the segmented steel bridge, which comprises the following steps:
1) preprocessing and manufacturing the adjusting assembly 4 and the limiting assembly 5, manufacturing two identical external thread rods, and manufacturing a first internal thread sleeve 51 and a second internal thread sleeve 52 according to the diameters and threads of the external thread rods;
2) welding positioning components 3 at the corners of the adjacent ends of the top plates of the fixed beam body 1 and the beam body 2 to be fixed respectively, ensuring the position symmetry of the positioning components 3, and welding the angle steel with holes at the four adjacent corners of the fixed beam body and the beam body to be fixed respectively;
3) the adjusting component 4 penetrates through the symmetrical positioning components 3 to ensure that the positioning components 3 are within the adjusting range of the adjusting component 4, specifically, an external thread rod sequentially penetrates through holes of a group of symmetrical perforated angle steels and ensures that straight thread threads are positioned in the perforated angle steel holes of the fixed beam body 1 and oblique thread threads are positioned in the perforated angle steel holes of the beam body 2 to be fixed;
4) installing a limiting component 5 at a position, close to a penetrating surface of the positioning component 3, of the adjusting component 4, and installing and fixing the limiting component 5 and the positioning component 3, specifically, connecting the limiting component 5 on two side surfaces, where the external threaded rod passes through the angle steel hole with the hole, using a buckle to open a cylindrical structure to enable the cylindrical structure to be sleeved outside the corresponding threaded section, attaching the end of a fixed lug plate 53 of the cylindrical structure to the penetrating surface of the angle steel with the hole, closing the cylindrical structure, and passing through the fixed lug plate 53 through a bolt to be connected with the angle steel with the hole through a bolt;
5) the control and adjustment component 4 works and adjusts the position of the beam body 2 to be fixed to be close to or far away from the fixed beam body 1, a rotating handle 61 is installed on the handle connecting section 62, the rotating handle 61 is screwed to control the external threaded rod to rotate, and the beam body 2 to be fixed is pulled.
6) After the distance between one external thread rod is adjusted in place, the rotating handle 61 is removed and installed on the other external thread rod to be screwed, and when the two beam bodies finish the whole distance control process and the welding process, the limiting assembly 5 is unfastened, so that the flow construction is formed.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a horizontal interval micromatic setting of burst formula steel bridge hoist and mount which characterized in that: including locating component (3), adjusting part (4) and spacing subassembly (5), locating component (3) symmetry sets up in fixed roof beam body (1) and treats near fixed roof beam body (2) adjacent end surface, adjusting component (4) and fixed roof beam body (1) surface parallel ground through connection locating component (3), spacing subassembly (5) detachably installs in locating component (3) plane of running through, adjusting component (4) and spacing subassembly (5) cooperateable realize fixed roof beam body (1) and treat fixed roof beam body (2) interval regulation, just spacing subassembly (5) can be dismantled with adjusting component (4) and be connected.
2. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 1, characterized in that: the adjusting part (4) is the external screw thread pole, the external screw thread pole surface includes that two sections intervals set up and have first screw thread section (41) and second screw thread section (42) of certain length, first screw thread section (41) and second screw thread section (42) are corresponding to fixed roof beam body (1) respectively and treat fixed roof beam body (2) symmetrical setting's locating component (3), just first screw thread section (41) are different with second screw thread section (42) screw thread, first screw thread section (41) are the straight thread screw thread, second screw thread section (41) are the inclined wire screw thread, spacing subassembly (5) include with first screw thread section (41) and second screw thread section (42) screw-thread fit's first internal thread sleeve (51) and second internal thread sleeve (52).
3. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 2, characterized in that: one end of the first internal thread sleeve (51) and one end of the second internal thread sleeve (52) are provided with fixing lug plates (53) extending outwards, and the limiting component (5) penetrates through the fixing lug plates (53) through bolts to be detachably connected with the penetrating surfaces of the positioning components (3).
4. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 2, characterized in that: first internal thread sleeve (51) and second internal thread sleeve (52) all are cylinder formula structure, cylinder formula structure is formed by the butt joint of two semicircle arcs that the opening is relative, and two semicircle arc one is articulated through fixed rotation axis (54) relative limit, and another relative limit passes through the buckle and can open and shut the connection, cylinder formula structure includes corresponding internal thread.
5. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 2, characterized in that: one end of the external thread rod close to the fixed beam body (1) comprises a detachable rotating handle assembly (6).
6. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 5, characterized in that: rotate handle subassembly (6) including twist grip (61) and handle linkage segment (62) of Z type, twist grip (61) one end is used for the gripping, and the other end includes inside sunken cell body, handle linkage segment (62) set up in external screw rod tip position along the axial with integrated into one piece, handle linkage segment (62) surface and twist grip (61) cell body gomphosis joint.
7. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 6, characterized in that: the handle connecting section (62) is of an outer hexagonal structure, and the groove body is an inner hexagonal groove body.
8. The horizontal spacing fine-tuning device for hoisting of the split-type steel bridge according to claim 1, characterized in that: locating component (3) are foraminiferous angle steel, two perpendicular faces of foraminiferous angle steel all have the through-hole that holds adjusting part (4) and run through, run through face both sides and all set up spacing subassembly (5).
9. The horizontal spacing fine-adjustment device for hoisting of the split-type steel bridge according to any one of claims 1 to 8, wherein: and the positioning assemblies (3) are arranged in a plurality of groups at intervals along the width direction of the beam body.
10. The construction method of the horizontal spacing fine adjustment device for hoisting the split steel bridge according to any one of claims 1 to 8, characterized by comprising the following steps:
1) preprocessing and manufacturing the adjusting assembly (4) and the limiting assembly (5);
2) welding positioning components (3) at the corners of the adjacent ends of the top plates of the fixed beam body (1) and the beam body (2) to be fixed respectively to ensure the position symmetry of the positioning components (3);
3) the adjusting component (4) penetrates through the symmetrical positioning components (3) to ensure that the positioning components (3) are in the adjusting range of the adjusting component (4);
4) a limiting component (5) is arranged at the position, close to the penetrating surface of the positioning component (3), of the adjusting component (4), and the limiting component (5) and the positioning component (3) are fixedly arranged;
5) the control and adjustment assembly (4) works to adjust the position of the beam body (2) to be fixed to be close to or far away from the fixed beam body (1).
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