CN104929413A - Signal traffic light communication tower - Google Patents
Signal traffic light communication tower Download PDFInfo
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- CN104929413A CN104929413A CN201510368196.4A CN201510368196A CN104929413A CN 104929413 A CN104929413 A CN 104929413A CN 201510368196 A CN201510368196 A CN 201510368196A CN 104929413 A CN104929413 A CN 104929413A
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Abstract
The invention discloses a signal traffic light communication tower comprising a tower body. The top end of the tower body is connected to a lightning rod; the upper portion of the tower body is provided with antenna supports and platforms; the middle portion of the tower body is provided with a GPS installation support; the lower portion of the tower body is provided with a monitoring support arm used for installing monitoring devices and a signal light support arm used for installing traffic signal lights; and one side of the tower body is provided with a ladder stand and a safety rope. The tower is advantageous in that the tower body is a single-pipe tower in the shape of a regular hexadecagon, the tower employs a sleeving connection manner and is provided with the external ladder stand, an original hoop type installation manner is replaced by a tower body embedded manner, the traffic signal lights and monitoring devices are integrally arranged on the tower, and problems that a view tower in the urban street is difficult to construct and an original signal tower has a single function are effectively solved.
Description
Technical field
The present invention relates to a kind of signal traffic lamp communication tower, particularly relate to a kind of Jian several functions such as dress traffic lights, sky eye monitoring etc. in the multifunctional signal beacon of one, be applicable in urban district and crossroad place of suburbs and counties under the jurisdiction of a large city, be combined with traffic lights, monitor and control facility etc., belong to communication tower field.
Background technology
Along with the development of the communication technology, the requirement of people to communication network coverage rate is more and more higher.Operator adopts the mode of erection communication tower to expand the area of network's coverage area to meet people to the requirement of the network coverage usually.But existing communication tower mostly is steel work tower body, relatively be adapted at field erection, install, but in urban district or when people compare the place installation of gathering, the steel tower of steel work and surrounding environment are very inharmonious, the function of present landscape tower class communication tower is single, can only use as Signal transmissions.For more than, currently need research and develop a kind of signal lamp multipurpose tower, can make it while reaching communication role, can also realize the several functions such as traffic lights, sky eye monitoring being installed in one, the multifunctional signal beacon that Practical Performance is strong.
Summary of the invention
The object of the invention is to provide a kind of signal traffic lamp communication tower, to solve the problem of existing communication signal tower installation site difficulty, function singleness.
For achieving the above object, technical scheme of the present invention is: a kind of signal traffic lamp communication tower, comprises tower body, wherein, is connected with lightning rod on the top of described tower body, is provided with antenna holder and platform on the top of described tower body; GPS mounting bracket is provided with at the middle part of tower body; The monitoring support arm for installing supervising device and the signal lamp support arm for installing traffic lights is provided with in the bottom of tower body; Cat ladder and safety rope is provided with in the side of tower body.
Described lightning rod comprises lightning rod syringe needle and at least one pipe joint body, and lightning rod syringe needle is connected to the top of body, is provided with lightning rod flange in the bottom of body, and this lightning rod flange is connected with the companion flange on tower body top.
Described antenna holder is at least provided with one deck, and every one deck antenna holder is provided with three, and is evenly arranged in around tower body; Every day, line bracket was connected with tower body by the linking arm of at least two horizontal radials; The tower body on line bracket every day side is respectively provided with an antenna feed string holes.
The platform described in one is provided with below one deck or two-layer antenna holder.
Described GPS mounting bracket comprises horizontal radial arm, bearing diagonal, vertical rod and horizontal cross arm, one end of horizontal radial arm is connected with tower body radial direction, the middle part of horizontal cross arm is vertically connected on the middle part of horizontal radial arm, respectively connects a vertical rod at the other end of horizontal radial arm and the two ends of horizontal cross arm; Bearing diagonal is connected with between tower body below this horizontal radial arm.
Described monitoring support arm comprises lateral arms and mounting disc, and one end radial direction of lateral arms is connected on tower body, and connection dish below the other end of lateral arms, this mounting disc is provided with multiple installing hole.
Described signal lamp support arm comprises armed lever, support arm flange, support arm connecting ring and a support arm flange stiffener, support arm connecting ring is enclosed within the periphery of tower body, and with tower body inside and outside contact surface carry out weld all around, the bottom of propping up armed lever is interconnected with the corresponding flange on support arm connecting ring by support arm flange, is welded with multiple edge and props up the peripheral support arm flange stiffener distributed of armed lever between support arm flange and the periphery, bottom of an armed lever; At a STH of the tower body of the bottom end corresponding to an armed lever, the bottom of an armed lever is extended and is embedded in tower body.
A described armed lever is made up of polygon pipe, and the diameter of its bottom is greater than the diameter on top.
Described tower body is socketed to form by the first coaxial successively from top to bottom tower section, the second tower section and the 3rd tower section, is provided with tower body mounting flange and is welded on the multiple circumferentially equally distributed stiffeners above tower body mounting flange and between tower body periphery in the bottom of the 3rd tower section; Described tower body is made up of polygon body, and the diameter of its bottom is slightly larger than the diameter on top; Actuating doors is respectively equipped with in the bottom of the second described tower section and the 3rd tower section; Each tower section is provided with multiple cover Jie Laer.
Described cat ladder is made up of pedal and cat ladder bar, and cat ladder bar and tower body be arranged in parallel, and is connected with tower body by multiple fixing ear, is provided with multiple interlaced pedal in the both sides of cat ladder bar; Be provided with safety rope on the side of this cat ladder, its two ends fix the top of ear and tower body with safety rope respectively and bottom is connected, and this safety rope is equipped with turnbuckle.
Advantage of the present invention is: adopt tower body to be positive ten hexagon single-pipe towers, and type of attachment is socket, if outer cat ladder, it is embedded that the installation replacing original hood type changes tower body into; Combine traffic lights, watch-dog in one, efficiently solve drive Study of Platycladus orientalis-Robinia pseudoacacia tower and build difficulty, and original signal tower function singleness problem.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention;
Fig. 2 is relative position (the vertical direction projection in the horizontal plane) schematic diagram of antenna holder in Fig. 1 Fig. 1, actuating doors, GPS pole, outer cat ladder, safety rope;
Fig. 3 is the overall structure schematic diagram of lightning rod in Fig. 1;
Fig. 4 is the cutaway view Amplified image at P place in Fig. 3;
Fig. 5 is the B-B sectional view of Fig. 3;
Fig. 6 is the C-C sectional view of Fig. 5;
Fig. 7 is the structural representation of the first tower section in Fig. 1; .
Fig. 8 is the structural representation of the second tower section in Fig. 1;
Fig. 9 is the structural representation of the 3rd tower section in Fig. 1;
Figure 10 is the structural representation that in Fig. 1, two joint tower sections are socketed mutually;
Figure 11 is the partial structurtes schematic diagram of cat ladder in Fig. 1;
Figure 12 is the right view of Figure 11;
Figure 13 is the syndeton sectional view of cat ladder of the present invention and tower body;
Figure 14 is the D-D sectional view of Figure 13;
Figure 15 is the mounting structure schematic diagram of safety rope of the present invention;
Figure 16 is the structural representation of inventive antenna support;
Figure 17 is the enlarged drawing on right side in Figure 16;
Figure 18 is the top view of Figure 16;
Figure 19 is the H-H sectional view of Figure 17;
Figure 20 is the I-I sectional view of Figure 19;
Figure 21 is the structural representation of GPS mounting bracket in Fig. 1;
Figure 22 is the J-J sectional view of Figure 21;
Figure 23 is the top view of Figure 21;
Figure 24 is the structural representation of signal lamp support arm and monitoring support arm in Fig. 1;
Figure 25 is the structural representation (G to) on the top of signal lamp support arm in Figure 24;
Figure 26 is the N-N sectional view monitoring support arm mounting disc in Figure 24;
Figure 27 is the E-E sectional view (connecting ring of signal lamp support arm and tower body) of Figure 24;
Figure 28 is the right view of the adpting flange of signal lamp support arm in Figure 27.
Description of reference numerals: 1, lightning rod, 11, lightning rod syringe needle, 12, first segment body, 13, second section body, 14, lightning rod flange, 141, installing hole, 15, stiffener; 16, weld, 17, piercing welding place, 18, flange welding place; 2, tower body, 21, the first tower section, 200, Jie Laer is overlapped, 211, cap is pushed up, 213, (effect is that operating personnel fix up an aerial wire to foot rest, the disk that rectification antenna is stopped over), 22, the second tower section, the 23, the 3rd tower section, 231, feeder window, 232, chute fixed head (effect connects the fixing component of outdoor cabling rack), 234, lightning protection earthing fixed head (effect connects the component that lightning-arrest earth mat lead-out wire connects), 24, tower body mounting flange, 25, stiffener, 26, cat ladder fixes ear, and 27, antenna feed string holes; 3, antenna holder, 31, linking arm, 32, u tie, 33, fixed head; 4, platform, 5, GPS mounting bracket, 51, horizontal radial arm, 52, bearing diagonal, 53, vertical rod, 54, horizontal cross arm; 6, support arm is monitored, 61, lateral arms, 62, mounting disc, 63, gripper shoe, 64, (length) hole is installed; 7, signal lamp support arm, 71, armed lever, 72, support arm flange, 73, support arm connecting ring, 74, support arm flange stiffener, 75 support arm flange fixing holes; 8, cat ladder, 81, pedal, 82, cat ladder bar, 83, fixing ear, 9, safety rope, 91, safety rope fixes ear, 92, turnbuckle, 10, actuating doors.
Detailed description of the invention
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention will be more clear along with description.It should be understood that described embodiment is only exemplary, any restriction is not formed to scope of the present invention.It will be understood by those skilled in the art that and can modify to the details of technical solution of the present invention and form or replace down without departing from the spirit and scope of the present invention, but these amendments or replacement all fall into protection scope of the present invention.
See Fig. 1 ~ Figure 28, the embodiment of a kind of signal traffic lamp of the present invention communication tower, comprise tower body 2, lightning rod 1 is connected with on the top of tower body 2, be provided with the antenna holder 3 of three layers, every layer three groups on the top of tower body 2, below the antenna holder 3 of the superiors and undermost antenna holder 3 below be respectively equipped with a platform 4.GPS mounting bracket 5 is provided with at the middle part of tower body 2; Being provided with the monitoring support arm 6 for installing supervising device in the bottom (position on the upper side) of tower body 2, being provided with the signal lamp support arm 7 for installing traffic lights in the below of monitoring support arm 6.Cat ladder 8 and safety rope 9 is provided with in the side of tower body 2.
See Fig. 3-Fig. 6, the 2-section pipe body 12 and 13 that described lightning rod 1 comprises lightning rod syringe needle 11 and mutually connects together, lightning rod syringe needle 11 is connected to the top of the body 12 of a joint above, the bottom of the body 13 of a joint is welded with lightning rod flange 14 below, and lightning rod flange 14 is welded with multiple stiffener 15.This lightning rod flange 14 is connected with the companion flange of the top cap 211 (see Fig. 7) being located at tower body 2 top.The structure that 2-section pipe body 12 and 13 is socketed as shown in Figure 4, the lower end of the body 12 of a joint is inserted in body 13 upper end of a joint below above, body 13 upper end is welded with body 12 (weld 16), circumferentially be provided with multiple radial direction through hole in the bottom of 2-section pipe body 12 and 13 socket part and rivet (welding), ensure that the reliability that 2-section pipe body 12 is connected with 13.
See Fig. 7-Fig. 9, described tower body 2 is by being socketed to form by the first coaxial tower section 21, second tower section 22 and the 3rd tower section 23 successively from top to bottom, socketing method adopts epimere tower body socket hypomere housing structure, (natural grafting, without the need to being welded with to carry out occlusion locking by tower body diameter and machining accuracy.Be engaged nature locking by weight with pipe external diameter, because be polygon, can not rotate).Be welded with tower body mounting flange 24 in the bottom of the 3rd tower section 23 and be welded on above tower body mounting flange 24 and multiple circumferentially equally distributed stiffeners 25 between tower body 2 periphery.Described tower body 2 is become by positive ten hexagonal tube systems, and the diameter of its bottom is slightly larger than the diameter (tower height 30.00m, bottom diameter 0.85m, top end diameter 0.40m, terminal height 3m) on top.Actuating doors 10 is respectively equipped with in the bottom of the second described tower section 22 and the 3rd tower section 23.In the upper and lower of the first tower section 21 and the second tower section 22, and the top of the 3rd tower section 23 is respectively provided with multiple cover joint and draws ear 200 (structure for erection tower section wire rope threading).
See Figure 11-Figure 15, described cat ladder 8 is made up of pedal 81 and cat ladder bar 82, and cat ladder bar 82 and tower body 2 be arranged in parallel, and are connected with tower body 2 by multiple fixing ear 83, are provided with multiple interlaced pedal 81 in the both sides of cat ladder bar 82.Be provided with safety rope 9 on the side of this cat ladder 8, its two ends fix the top of ear 91 and tower body 2 with safety rope respectively and bottom is connected, and this safety rope 9 is equipped with turnbuckle 92.
See Figure 16-Figure 20, the antenna holder 3 of this embodiment is provided with three layers, and every layer of antenna holder installs three slave antenna supports 3, and is evenly arranged in tower body 2 around, can install totally 9 slave antennas.Every day, line bracket 3 was connected with tower body 2 (fixed head 33 is welded on the top of linking arm 31, antenna holder 3 and fixed head 33 is connected and fixed with u tie 32) by the linking arm 31 of two horizontal radials; The tower body 21 on line bracket 3 every day side is respectively provided with an antenna feed string holes 27.
See Figure 21-Figure 23, described GPS mounting bracket 5 comprises horizontal radial arm 51, bearing diagonal 52, vertical rod 53 and horizontal cross arm 54, one end of horizontal radial arm 51 is connected with tower body radial direction, the middle part of horizontal cross arm 54 is vertically connected on the middle part of horizontal radial arm 51, respectively connects a vertical rod 53 at the other end of horizontal radial arm 51 and the two ends of horizontal cross arm 54; Below this horizontal radial arm 51 be connected bearing diagonal 52 between tower body.
See Figure 24-Figure 28, monitoring support arm 6 is set in 9.5 meters of high positions of tower body 2, this monitoring support arm 6 comprises lateral arms 61 and mounting disc 62, one end radial direction of lateral arms 61 is connected on tower body 2, connection dish 62 below the other end of lateral arms 61, this mounting disc 62 is provided with multiple installation elongated hole 63 for installing watch-dog.Monitoring support arm 6 adopts tower body 2 one STH, lateral arms 61 bottom is embedded and uses triangle stiffener 63 to be welded on below lateral arms 61 and tower body 2 angle.
At 6.5 meters of high position signal lamp support arms 7 of tower body 2, this signal lamp support arm 7 comprises armed lever 71, support arm flange 72, support arm connecting ring 73 and a support arm flange stiffener 74, and support arm connecting ring 73 is enclosed within the periphery of tower body 2, and with tower body inside and outside contact surface carry out weld all around.The bottom of propping up armed lever 71 is interconnected with the corresponding flange on support arm connecting ring 73 by support arm flange 72.Support arm flange 72 is welded on the close bottom end of an armed lever 71, is welded with multiple edge and props up the peripheral support arm flange stiffener 74 distributed of armed lever 71 between support arm flange 72 and the periphery, bottom of an armed lever 71.At a STH of the tower body 2 of the bottom end corresponding to an armed lever 71, extended the bottom of an armed lever 71 and be embedded in tower body 2, such structure improves bonding strength, can better meet the load-bearing demand of Traffic signal post.
A described armed lever 71 is made up of regular polygon pipe, and the diameter of its bottom is greater than the diameter on top (bottom 201mm, top 110mm, length 7000mm).
Described tower body 2 and signal lamp prop up armed lever 71 for hollow-core construction, and both run through, and the inside that power line and control line prop up armed lever 71 from tower body and signal lamp is passed, and extends in signal lamp.
Tower body 2 of the present invention, flange and flange stiffener all adopt Q345B, and stone bolt is Q345B, and other steel, round steel, steel plate all adopt Q235B.
Preservative treatment done by all components, adopts galvanizing anticorrosion.Zinc adhesion amount should be not less than 610g/m, and for the component being not less than 6mm, zinc layers average thickness is not less than 86 μm, thickness is less than to the component of 6mm, and zinc layers average thickness is not less than 65 μm, and its uniformity and tack should by code requirements.
Need to carry out plastic-blasting process after the overall outer surface heat of steel tower 2 is zinc-plated, plastic-blasting concrete technology performs according to related specifications, suggestion technique is pickling, cleaning, oven dry, galvanizing, scarfing cinder, polish flat, clean scrubbing, plastic-blasting (color is pure white), and shearing resistance face is without the need to process.
Described actuating doors 10 and GPS mounting bracket 5 should be arranged on distance cat ladder 8 nearby, and feeder line mouth should be arranged on distance antenna holder 3 nearby.
The above embodiment of the present invention, just for illustration of technical scheme of the present invention, does not limit the scope of the invention.The present invention is directed to original signal tower function singleness, solve communication signal transmissions simultaneously, the arrangement of traffic lights and monitoring, and in urban district and suburbs and counties under the jurisdiction of a large city give good solution without communication tower installation site problem, the billboard extended by this scheme, warning sign etc. are all in this scheme.
Claims (10)
1. a signal traffic lamp communication tower, comprises tower body, it is characterized in that: be connected with lightning rod on the top of described tower body, is provided with antenna holder and platform on the top of described tower body; GPS mounting bracket is provided with at the middle part of tower body; The monitoring support arm for installing supervising device and the signal lamp support arm for installing traffic lights is provided with in the bottom of tower body; Cat ladder and safety rope is provided with in the side of tower body.
2. signal traffic lamp communication tower according to claim 1, it is characterized in that: described lightning rod comprises lightning rod syringe needle and at least one pipe joint body, lightning rod syringe needle is connected to the top of body, be provided with lightning rod flange in the bottom of body, this lightning rod flange is connected with the companion flange on tower body top.
3. signal traffic lamp communication tower according to claim 1, is characterized in that: described antenna holder is at least provided with one deck, and every one deck antenna holder is provided with three, is evenly arranged in around tower body; Every day, line bracket was connected with tower body by the linking arm of at least two horizontal radials; The tower body on line bracket every day side is respectively provided with an antenna feed string holes.
4. signal traffic lamp communication tower according to claim 3, is characterized in that: below one deck or two-layer antenna holder, be provided with the platform described in.
5. signal traffic lamp communication tower according to claim 1, it is characterized in that: described GPS mounting bracket comprises horizontal radial arm, bearing diagonal, vertical rod and horizontal cross arm, one end of horizontal radial arm is connected with tower body radial direction, the middle part of horizontal cross arm is vertically connected on the middle part of horizontal radial arm, respectively connects a vertical rod at the other end of horizontal radial arm and the two ends of horizontal cross arm; Bearing diagonal is connected with between tower body below this horizontal radial arm.
6. signal traffic lamp communication tower according to claim 1, it is characterized in that: described monitoring support arm comprises lateral arms and mounting disc, one end radial direction of lateral arms is connected on tower body, and connection dish below the other end of lateral arms, this mounting disc is provided with multiple installing hole.
7. signal traffic lamp communication tower according to claim 1, it is characterized in that: described signal lamp support arm comprises armed lever, support arm flange, support arm connecting ring and a support arm flange stiffener, support arm connecting ring be enclosed within tower body periphery and with tower body inside and outside contact surface carry out weld all around, the bottom of propping up armed lever is interconnected with the corresponding flange on support arm connecting ring by support arm flange, is welded with multiple edge and props up the peripheral support arm flange stiffener distributed of armed lever between support arm flange and the periphery, bottom of an armed lever; At a STH of the tower body of the bottom end corresponding to an armed lever, the bottom of an armed lever is extended and is embedded in tower body.
8. signal traffic lamp communication tower according to claim 7, is characterized in that: a described armed lever is made up of polygon pipe, and the diameter of its bottom is greater than the diameter on top.
9. signal traffic lamp communication tower according to claim 1, it is characterized in that: described tower body, by being socketed to form by the first coaxial tower section, the second tower section and the 3rd tower section successively from top to bottom, being provided with tower body mounting flange in the bottom of the 3rd tower section and being welded on the multiple circumferentially equally distributed stiffeners above tower body mounting flange and between tower body periphery; Described tower body is made up of polygon body, and the diameter of its bottom is slightly larger than the diameter on top; Actuating doors is respectively equipped with in the bottom of the second described tower section and the 3rd tower section; Each tower section is provided with multiple cover Jie Laer.
10. signal traffic lamp communication tower according to claim 1, it is characterized in that: described cat ladder is made up of pedal and cat ladder bar, cat ladder bar and tower body be arranged in parallel, and are connected with tower body by multiple fixing ear, are provided with multiple interlaced pedal in the both sides of cat ladder bar; Be provided with safety rope on the side of this cat ladder, its two ends fix the top of ear and tower body with safety rope respectively and bottom is connected, and this safety rope is equipped with turnbuckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510368196.4A CN104929413B (en) | 2015-06-29 | 2015-06-29 | Signal traffic lamp communication tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510368196.4A CN104929413B (en) | 2015-06-29 | 2015-06-29 | Signal traffic lamp communication tower |
Publications (2)
| Publication Number | Publication Date |
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| CN104929413A true CN104929413A (en) | 2015-09-23 |
| CN104929413B CN104929413B (en) | 2017-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510368196.4A Expired - Fee Related CN104929413B (en) | 2015-06-29 | 2015-06-29 | Signal traffic lamp communication tower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782862A (en) * | 2016-02-18 | 2016-07-20 | 广东中艺重工有限公司 | Multifunctional communication light pole |
| CN112324222A (en) * | 2020-10-10 | 2021-02-05 | 安徽工程大学 | Communication tower signal transmitter frame capable of being safely assembled and threading method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2581632Y (en) * | 2002-07-15 | 2003-10-22 | 同济大学科学技术开发公司 | Single tube tower with bionic ornament and coordinative property with environment |
| CN202767606U (en) * | 2012-08-31 | 2013-03-06 | 湖北邮电规划设计有限公司 | Communication monopole |
| US20140053500A1 (en) * | 2012-08-24 | 2014-02-27 | Wake Skykeeper, Llc | Monopole tower reinforcement configuration and related methods |
| CN204326671U (en) * | 2014-12-22 | 2015-05-13 | 景县电讯金属构件制造有限公司 | Novel rapid-installation formula tubular type base station towers |
| CN204782187U (en) * | 2015-06-29 | 2015-11-18 | 中国铁塔股份有限公司长春市分公司 | Signal traffic light communication tower |
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2015
- 2015-06-29 CN CN201510368196.4A patent/CN104929413B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2581632Y (en) * | 2002-07-15 | 2003-10-22 | 同济大学科学技术开发公司 | Single tube tower with bionic ornament and coordinative property with environment |
| US20140053500A1 (en) * | 2012-08-24 | 2014-02-27 | Wake Skykeeper, Llc | Monopole tower reinforcement configuration and related methods |
| CN202767606U (en) * | 2012-08-31 | 2013-03-06 | 湖北邮电规划设计有限公司 | Communication monopole |
| CN204326671U (en) * | 2014-12-22 | 2015-05-13 | 景县电讯金属构件制造有限公司 | Novel rapid-installation formula tubular type base station towers |
| CN204782187U (en) * | 2015-06-29 | 2015-11-18 | 中国铁塔股份有限公司长春市分公司 | Signal traffic light communication tower |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782862A (en) * | 2016-02-18 | 2016-07-20 | 广东中艺重工有限公司 | Multifunctional communication light pole |
| CN112324222A (en) * | 2020-10-10 | 2021-02-05 | 安徽工程大学 | Communication tower signal transmitter frame capable of being safely assembled and threading method |
| CN112324222B (en) * | 2020-10-10 | 2021-12-10 | 安徽工程大学 | Communication tower signal transmitter frame capable of being safely assembled and threading method |
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| Publication number | Publication date |
|---|---|
| CN104929413B (en) | 2017-06-27 |
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