CN107727308A - Steel pipe column is split up failure internal pressure multiparty control automatic alarm system - Google Patents
Steel pipe column is split up failure internal pressure multiparty control automatic alarm system Download PDFInfo
- Publication number
- CN107727308A CN107727308A CN201710978278.XA CN201710978278A CN107727308A CN 107727308 A CN107727308 A CN 107727308A CN 201710978278 A CN201710978278 A CN 201710978278A CN 107727308 A CN107727308 A CN 107727308A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- pressure
- pipe column
- capital
- away
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
Abstract
The present invention relates to the automatic alarm system to prevent from steel pipe column to be split up losing bearing capacity to research and develop, when particularly in tunnel or system of deep foundation pit support using steel pipe column as the main member of Bracing Systems, the steel duct Stress control automatic alarm system researched and developed for situation about being ftractureed inside northern China winter low temperature steel pipe column containing soil by frost heave.Steel pipe column along its length on place one group and can sense steel duct pressure size, send warning sound automatically immediately when pressure reaches a threshold value, and be equipped with the warning system that colour lamplight is shown, realize automatic immediate warning function.Thus corresponding prediction scheme measure is taken, so as to avoid the engineering accident caused by steel pipe column bursting by freezing caused by internal pressure cataclysm from occurring.
Description
Technical field
The present invention relates to the automatic alarm system to prevent from steel pipe column to be split up losing bearing capacity to research and develop, particularly tunnel or
When in system of deep foundation pit support using steel pipe column as the main member of Bracing Systems, for northern China winter low temperature steel pipe
The steel duct Stress control automatic alarm system that situation about being ftractureed inside post containing soil by frost heave is researched and developed.
Background technology
Steel pipe column is that city open cut or half lid excavation construction tunnel and Bridge Piers or deep foundation pit of tall buildings are a kind of common
The important component of supporting structure system.The composition of this Bracing Systems generally includes：Pass through drilling before excavation of foundation pit
Steel pipe column (or lattice column), the horizontal steel pipe horizontal support going along with sb. to guard him campshed, provide vertical supporting power of construction casting, will go along with sb. to guard him
The Guan Liang of the common stress of stake top portion consolidation one, the steel that the trestle plate in constructing operation face is provided, stress is supported for bracing members both ends
Purlin, steel pipe column bottom pile foundation, for the bracing members support parallel to binder direction, the concrete parallel to Guan Liang direction in place
Binder.
This system of deep foundation pit support resistance to overturning is good, using quite varied in Practical Project.In whole prop
In system, the effect of steel pipe column is that upper end provides fulcrum for the horizontal concrete support of top horizontal, bears lid excavation construction or half lid
The vertical load to be got off at the top of excavation construction foundation ditch by concrete support transmission.Pipe column lower end is implanted into ground, the part and coagulation
Steel reinforcement cage inside native stake welds together.During erection of steel pipe column, the construction method of use is before lifting, by steel pipe column with mixing
The steel reinforcement cage of solidifying native stake welds together implantation and bored in advance in the stake holes dug, then injects and mix into lower concrete pile cages
Solidifying soil, until being poured into predetermined design.This construction method, during pouring concrete pile will certainly by the water in stake holes and
Mud is headed into steel pipe column, makes to be full of mud in steel pipe column.In northern China, after excavation of foundation pit, run into winter, steel pipe
Mud in post certainly will will cause freezing up, steel pipe column is born huge internal expansion power, this expansive force is enough to make steel pipe column
It is split up, causes steel pipe columns bearing capacity to lose, can finally cause support system structural instability.Steel pipe column is split up the situation of failure in north
Happened occasionally on square base pit engineering.
For such case, during foundation ditch winter construction, prevent the measure that steel pipe column bursting by freezing is taken from including increase foundation ditch
Insulation, except being punched on steel pipe post jamb, by the moisture in steel pipe column, discharge is outer as far as possible, also to carry out heating in foundation ditch,
Every steel pipe column is heated if necessary.Heating can cause steel pipe column bursting by freezing not in time, and excessively heating can improve construction cost,
Cause energy waste.Therefore in time grasp steel pipe column internal pressure, reach be split up before realize automatic alarm, so as to take heating
Etc. safeguard measure, avoid steel pipe column from being split up caused steel pipe columns bearing capacity and lose, so as to ensure that the stabilization of support system structure
Property.Such as certain quick main line in city north and south does not exclude steel pipe column internal moisture in time in city tunnel winter construction, and to steel
Tubing string heats not in time, causes in tunnel 73 steel pipe columns are different degrees of to be split up, steel pipe walls are complete from the top to bottom for 24 steel pipe columns
Standard-sized sheet splits, and causes to cause steel pipe columns bearing capacity to be lost, is forced in beside every steel pipe column being split up and augments a steel pipe column, and
Wrap up electric blanket on the shaft that more than 200 steel pipe column 10 is grown heat within 24 hours, it is ensured that steel pipe column is no longer by bursting by freezing, to ensure
The stabilization of original support system in tunnel foundation ditch.The increased construction cost of this measure is only taken to be up to more than 1,000 ten thousand yuan.
In using steel pipe column as the tunnel of main vertical applied force component or system of deep foundation pit support, for steel pipe column in the winter
Occur that bursting by freezing is dangerous in season construction and situation about can not find in time, take place one in steel pipe column different parts can be real-time
Monitor that steel pipe column internal pressure changes, warning sound sent automatically immediately when steel pipe column internal pressure reaches a threshold value,
And the warning system that colour lamplight is shown is equipped with, it is possible thereby to corresponding prediction scheme measure be taken in time, so as to avoid engineering accident
Generation.
The content of the invention
Goal of the invention：
In order to solve above-mentioned technical problem, a kind of steel pipe column internal pressure control automatic alarm system is invented.Adopt
Pressure change can be real-time monitored by taking inside steel pipe column diverse location to place one, when sensing that pressure change reaches certain
Send warning sound during limit value automatically immediately, and be equipped with the warning system that colour lamplight is shown.
Technical scheme：
A kind of steel pipe column is split up failure internal pressure multiparty control automatic alarm system, it is characterised in that：
Formed including steel pipe column, pressure switch and alarm three parts；
The steel pipe column upper end provides fulcrum, lower end implantation ground, with coagulation for the horizontal concrete support of top horizontal
Steel reinforcement cage inside native stake welds together；
The alarm includes：
Contact plate is fulcrum into lever construction using support column；Wherein one end of contact plate is another by spring connect base
There is electromagnet between end and base, have space between electromagnet and contact plate；
The electromagnet and pressure switch and electromagnet ring current composition closed-loop path；
Contact on contact plate is normally closed with green light binding post and ring current and green light is formed loop；
In the state of electromagnet is powered absorption contact plate, contact contacts with red light binding post, makes red light, PLC groups, electric bell
And ring current forms closed-loop path；
The pressure switch is composed in parallel by three pressure control switch；Wherein, first pressure controlling switch is arranged on steel
Tubing string top；Second pressure controlling switch is arranged in the middle part of steel pipe column；3rd pressure control switch is arranged on steel pipe column bottom.
Described steel pipe column is split up failure internal pressure multiparty control automatic alarm system, it is characterised in that：Each pressure
The structure of power controlling switch is separated between two panels bearing plate by pressure-bearing spring, and contact is relatively set with the inside of two panels bearing plate
With pressure switch binding post.
Steel pipe column is split up failure internal pressure multiparty control automatic alarm system, it is characterised in that：The PLC groups are by three groups
PLC is formed；Wherein PLC1 is connected with first pressure controlling switch；Wherein PLC2 is connected with second pressure controlling switch；Wherein
PLC3 is connected with the 3rd pressure control switch；Different alarm modes is set in three groups of described PLC.
Described steel pipe column is split up failure internal pressure multiparty control automatic alarm system, it is characterised in that：Described three
Installation site of the pressure control switch on steel pipe column be：
When steel pipe column length L is less than 9m, first pressure controlling switch is away from capital distance L1=L/3, second pressure control are opened
Close away from capital distance L2=3L/5；3rd pressure control switch is away from capital distance L3=4/5L；
As steel pipe column length L=9m, first pressure controlling switch is away from capital distance L1=2.5m, second pressure controlling switch
Away from capital distance L2=5.5m；3rd pressure control switch is away from capital distance L3=7.5m；
As steel pipe column length L=9~12m, first pressure controlling switch is away from capital distance L1=2.5~3.5m, the second pressure
Power controlling switch is away from capital distance L2=5.5~7.0m；3rd pressure control switch is away from capital distance L3=7.5~10m；
As steel pipe column length L=12m, first pressure controlling switch is away from capital distance L1=3.5m, second pressure control are opened
Close away from capital distance L2=7m；3rd pressure control switch is away from capital distance L3=10m；
As steel pipe column length L=12~16m, first pressure controlling switch is away from capital distance L1=3.5~6.0m, the second pressure
Power controlling switch is away from capital distance L2=7.0~9.5m；3rd pressure control switch is away from capital distance L3=10.0~12.5m；
As steel pipe column length L=16m, first pressure controlling switch is away from capital distance L1=6m, second pressure controlling switch
Away from capital distance L2=9.5m；3rd pressure control switch is away from capital distance L3=12.5m；
As steel pipe column length L=16~20m, first pressure controlling switch is away from capital distance L1=6.0~6.5m, the second pressure
Power controlling switch is away from capital distance L2=9.5~11.5m；3rd pressure control switch is away from capital distance L3=12.5~15.5m；
As steel pipe column length L=20m, first pressure controlling switch is away from capital distance L1=6.5m, second pressure control are opened
Close away from capital distance L2=11.5m；3rd pressure control switch is away from capital distance L3=15.5m.
When steel pipe column length L is more than 20m, first pressure controlling switch is away from capital distance L1=L/3, second pressure control are opened
Close away from capital distance L2=3L/5；3rd pressure control switch is away from capital distance L3=4/5L.
Advantage and effect：
The effect and advantage of the present invention is realized to prevent from steel pipe column to be split up losing bearing capacity and automatic alarm system, from
It is dynamic accurate, without artificial on duty.
1) amount of design pressure switch according to steel pipe column material and design size, can numerically be carried out in steel pipe column internal pressure
Journey scope, determine the upper and lower bound limit value of alarm pressure value.
2) same warning system can realize the pressure protection to steel pipe column multiple spot, cost-effective, increase the benefit；
3) realize automatic unattended and there is instantaneity warning function.
Thus corresponding prediction scheme measure is taken in time, avoids being split up because of steel pipe column, the engineering accident caused by
Occur.
Brief description of the drawings：
Fig. 1 alarm schematic diagrames；
Fig. 2 is pressure control switch structural representation；
Fig. 3 is foundation pit supporting construction and steel pipe column schematic diagram；
It is described to be labeled as：1. first pressure controlling switch, 2. second pressure controlling switches, 3. the 3rd pressure control switch,
4. contact plate, 5. electromagnet, 6. contacts, 7. green light binding posts, 8. red light binding posts, 9. green lights, 10. red lights, 11. alarm electricity
Bell, 12. alarm lamp ring currents, 13. electromagnet ring currents, 14. pressure-bearing springs, 15. bearing plates, 16. pressure switch wiring
Post, 17. fender posts, 18. Guan Liangs, 19. concrete supports, 20. steel pipe columns, 21. bracing members, 22. steel purlins, 23. floors, 24.
Ground.
Embodiment
The system includes three parts, i.e., steel pipe column, warning device in system of deep foundation pit support and on steel pipe column
Pressure switch three parts composition.
As shown in Figure 3：
The upper end of steel pipe column 20 is that the horizontal concrete support 19 of top horizontal provides fulcrum, lower end implantation ground 24, with mixing
The steel reinforcement cage inside native stake is coagulated to weld together.
The upper, middle and lower of steel pipe column are separately installed with pressure control switch, and the position respectively switched first has to consider steel pipe column length
Degree and horizontal bracing members arrangement position, according to horizontal bracing members arrange principle simultaneously refer to engineering experience, steel pipe column length and
Sensor mounting location is referring to following table：
1 alarm system pressure switch installation site of table
Above-mentioned pressure control switch links together with alarm, and the structure of alarm is as shown in Figure 1：
Contact plate 4 is fulcrum into lever construction using support column；Wherein one end of contact plate 4 is by spring connect base, separately
There is electromagnet 5 between one end and base, have space between electromagnet 5 and contact plate 4；
The electromagnet 5 forms closed-loop path with pressure switch and electromagnet ring current 13；
Contact 6 on contact plate 4 is normally closed with green light binding post 7 and ring current 12 and green light 9 is formed loop；
In the state of electromagnet 5 is powered absorption contact plate 4, contact 6 contacts with red light binding post 8, makes red light 10, PLC
Group, electric bell 11 and ring current 12 form closed-loop path；
Three pressure control switch compose in parallel the pressure switch by mentioned earlier；
The structure of each pressure control switch is separated between two panels bearing plate (15) by pressure-bearing spring (14), two panels
Contact and pressure switch binding post (16) are relatively set with the inside of bearing plate (15)；
PLC groups are provided with the alarm, are made up of three groups of PLC；Wherein PLC1 connects with first pressure controlling switch (1)
Connect；Wherein PLC2 is connected with second pressure controlling switch (2)；Wherein PLC3 is connected with the 3rd pressure control switch (3)；Described
Three groups of PLC in different alarm modes, table specific as follows are set：
The warning lamp of table 2 and alarm bell alarm mode are set
Reach alarming value to better discriminate between upper, middle and lower diverse location pressure inside steel pipe column, in warning lamp and alarm bell
Configure 3 groups of cyclelogs (PLC) on circuit, it is supporting that three groups of different police instruction red lights and alarm bell are set, in favor of can
Accurately distinguish dangerous spot position and warning reason.When steel pipe column upper pressure reaches alarming value, the 1st group of cyclelog PLC1
Work, the first group alarm instruction red light and alarm bell of setting start alarm；Similar, when steel pipe column middle part portion, pressure reaches alarm
During value, the 2nd group of cyclelog PLC1 work, the 2nd group alarm instruction red light and alarm bell of setting start alarm；Similar, when
When steel pipe column low pressure reaches alarming value, the 3rd group of cyclelog PLC1 work, the 3rd group alarm instruction red light of setting and
Alarm bell starts alarm.
When foundation pit construction, pressure is in normal range (NR) at upper, middle and lower three inside steel pipe column, system is in green by 7
Lamp binding post, 9 normal work green lights and 12 ring currents form closed-loop path, and now bracing members are in normal operating conditions, green
Lamp lights.When temperature drops to a certain degree in foundation ditch, inside steel pipe column at upper, middle and lower three in pressure any one reach setting
During numerical value, the pressure sensitive device where it passes to warning device main body by signal wire, and corresponding switch closes immediately in Fig. 1
Close, 5 work of electromagnet produce magnetic force, and by 6 contact joints and 7 green light wiring post separations, and 8 red light binding posts connect, and make system
In closed-loop path is formed by 8 red light binding posts, 9 police instruction red lights, 11 alarm electric bells and 12 ring currents, red light lights together
When electric bell sound, send alarm signal.And according to PLC effect so that during the switch alarm of diverse location, send different
Sound and light signal.
It is different according to the steel strength of steel pipe column in actual use, different alarming values is set to pressure switch.Such as certain
The specification of the steel pipe column of the quick main line Tunnel Design in city north and south is steel pipeSteel strength is designed as 315N/mm2,
Thus calculate and refer to engineering experience, obtaining specification general in engineering is The intensity alarming value of steel pipe column be
It see the table below respectively：
3 alarm system pressure sensor alarming values of table
By the implementation of the present invention, realize to prevent from steel pipe column to be split up losing bearing capacity and automatic alarm system, automatically
Precisely, without artificial on duty.
Claims (4)
1. a kind of steel pipe column is split up failure internal pressure multiparty control automatic alarm system, it is characterised in that：
Formed including steel pipe column (20), pressure switch and alarm three parts；
The steel pipe column upper end is that the horizontal concrete support (19) of top horizontal provides fulcrum, and lower end is implanted into ground (24), with
Steel reinforcement cage inside concrete-pile welds together；
The alarm includes：
Contact plate (4) is fulcrum into lever construction using support column；Wherein one end of contact plate (4) is by spring connect base, separately
There is electromagnet (5) between one end and base, have space between electromagnet (5) and contact plate (4)；The electromagnet (5) and pressure
Switch and electromagnet ring current (13) composition closed-loop path；
Contact (6) on contact plate (4) is normally closed with green light binding post (7) and forms back ring current (12) and green light (9)
Road；
In the state of electromagnet (5) is powered absorption contact plate (4), contact (6) contacts with red light binding post (8), makes red light
(10), PLC groups, electric bell (11) and ring current (12) form closed-loop path；
The pressure switch is composed in parallel by three pressure control switch；Wherein, first pressure controlling switch (1) is arranged on steel pipe
Post top；Second pressure controlling switch (2) is arranged in the middle part of steel pipe column；3rd pressure control switch (3) is arranged under steel pipe column
Portion.
2. steel pipe column according to claim 1 is split up failure internal pressure multiparty control automatic alarm system, its feature exists
In：The structure of each pressure control switch is separated between two panels bearing plate (15) by pressure-bearing spring (14), two panels pressure-bearing
Contact and pressure switch binding post (16) are relatively set with the inside of plate (15).
3. steel pipe column according to claim 1 is split up failure internal pressure multiparty control automatic alarm system, its feature exists
In：The PLC groups are made up of three PLC；Wherein PLC1 is connected with first pressure controlling switch (1)；The pressures of wherein PLC2 and second
Power controlling switch (2) connects；Wherein PLC3 is connected with the 3rd pressure control switch (3)；Set in three groups of described PLC different
Alarm mode.
4. steel pipe column according to claim 1 is split up failure internal pressure multiparty control automatic alarm system, its feature exists
In：Installation site of three pressure control switch on steel pipe column be：
When steel pipe column length L is less than 9m, first pressure controlling switch (1) is away from capital distance L1=L/3, second pressure controlling switch
(2) away from capital distance L2=3L/5；3rd pressure control switch (3) is away from capital distance L3=4/5L；
As steel pipe column length L=9m, first pressure controlling switch (1) is away from capital distance L1=2.5m, second pressure controlling switch
(2) away from capital distance L2=5.5m；3rd pressure control switch (3) is away from capital distance L3=7.5m；
As steel pipe column length L=9~12m, first pressure controlling switch (1) is away from capital distance L1=2.5~3.5m, second pressure
Controlling switch (2) is away from capital distance L2=5.5~7.0m；3rd pressure control switch is away from (3) capital distance L3=7.5~10m；
As steel pipe column length L=12m, first pressure controlling switch (1) is away from capital distance L1=3.5m, second pressure controlling switch
(2) away from capital distance L2=7m；3rd pressure control switch (3) is away from capital distance L3=10m；
As steel pipe column length L=12~16m, first pressure controlling switch (1) is away from capital distance L1=3.5~6.0m, second pressure
Controlling switch (2) is away from capital distance L2=7.0~9.5m；3rd pressure control switch (3) is away from capital distance L3=10.0~
12.5m；
As steel pipe column length L=16m, first pressure controlling switch (1) is away from capital distance L1=6m, second pressure controlling switch (2)
Away from capital distance L2=9.5m；3rd pressure control switch (3) is away from capital distance L3=12.5m；
As steel pipe column length L=16~20m, first pressure controlling switch (1) is away from capital distance L1=6.0~6.5m, second pressure
Controlling switch (2) is away from capital distance L2=9.5~11.5m；3rd pressure control switch (3) is away from capital distance L3=12.5~
15.5m；
As steel pipe column length L=20m, first pressure controlling switch (1) is away from capital distance L1=6.5m, second pressure controlling switch
(2) away from capital distance L2=11.5m；3rd pressure control switch (3) is away from capital distance L3=15.5m.
When steel pipe column length L is more than 20m, first pressure controlling switch (1) is away from capital distance L1=L/3, second pressure controlling switch
(2) away from capital distance L2=3L/5；3rd pressure control switch (3) is away from capital distance L3=4/5L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710978278.XA CN107727308B (en) | 2017-10-18 | 2017-10-18 | Steel pipe column expansion crack failure internal pressure multi-point control automatic alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710978278.XA CN107727308B (en) | 2017-10-18 | 2017-10-18 | Steel pipe column expansion crack failure internal pressure multi-point control automatic alarm system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107727308A true CN107727308A (en) | 2018-02-23 |
| CN107727308B CN107727308B (en) | 2020-03-03 |
Family
ID=61212026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710978278.XA Active CN107727308B (en) | 2017-10-18 | 2017-10-18 | Steel pipe column expansion crack failure internal pressure multi-point control automatic alarm system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107727308B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139305Y (en) * | 1992-06-15 | 1993-07-28 | 罗强 | Pressure switch |
| CN202137693U (en) * | 2011-05-10 | 2012-02-08 | 蒋思 | Pressure protecting device |
| CN202274857U (en) * | 2011-08-31 | 2012-06-13 | 王瑜 | Concrete formwork deformation monitoring alarm |
| CN103207118B (en) * | 2012-01-16 | 2014-12-24 | 中国石油天然气集团公司 | Real-time measuring apparatus and real-time measuring method for large deformation and stress of test tube in steel pipe bending deformation |
| CN202471335U (en) * | 2012-03-14 | 2012-10-03 | 中建商品混凝土有限公司 | Concrete pump pipe pressure monitoring warning device |
| CN104422618A (en) * | 2013-09-04 | 2015-03-18 | 江苏瑞银不锈钢制品有限公司 | Protection improvement device for steel pipe water pressure testing machine |
| CN104019849B (en) * | 2014-06-09 | 2016-06-08 | 河海大学 | Steel penstock and telescopic joint operating parameter automatic monitoring system and monitoring method thereof |
| CN205375724U (en) * | 2016-01-08 | 2016-07-06 | 曹清明 | Intelligent anti -theft net |
| CN106370343B (en) * | 2016-09-07 | 2019-04-30 | 中南大学 | Fan characteristic multipoint pressure synchro measure test macro |
| CN206514987U (en) * | 2017-03-10 | 2017-09-22 | 刘正茂 | A kind of piping lane internal pressure detection means |
-
2017
- 2017-10-18 CN CN201710978278.XA patent/CN107727308B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107727308B (en) | 2020-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206189461U (en) | Assembly folding type utility tunnel | |
| CN101701461B (en) | Method for constructing energy-saving underground tube structure | |
| CN107386308A (en) | A kind of side slope slopes automate precipitation method | |
| CN205975650U (en) | Building automation drainage system | |
| CN110055980B (en) | Thermoelectric refrigeration slide-resistant pile and construction method | |
| Dannemand Andersen et al. | Large thermal energy storage at Marstal district heating | |
| CN105350503B (en) | A kind of underground workshop factory becomes access tunnel structure and its construction method | |
| CN104993440A (en) | Lightning-protection manual grounding system and construction method by utilizing structure steel bar externally-connected downlead wire | |
| CN107727308A (en) | Steel pipe column is split up failure internal pressure multiparty control automatic alarm system | |
| CN104652495A (en) | Waterproof construction process for joint of inner support upright post of foundation pit and bottom plate | |
| CN107740424A (en) | Steel pipe column is split up failure internal pressure and temperature multiparty control automatic alarm system | |
| CN106013200B (en) | A kind of prefabricated assembled strip footing and construction technology | |
| CN105421477A (en) | Construction method for tower crane foundation | |
| CN206035045U (en) | Prefabricated assembled underground granary of endocyst plastics | |
| CN205753309U (en) | Prefabricated cable duct | |
| CN201367753Y (en) | Heat insulation and fire protection device for closed circular coal yard | |
| CN204000834U (en) | A kind of " chimney type " air chimney assembling piling strtucture | |
| CN206035051U (en) | Prefabricated caulking strips's in area circular underground granary of double -layer steel plate assembled | |
| CN106088762B (en) | A kind of prefabricated assembled round underground granary of insertion slot type encased steel plate | |
| CN112761249A (en) | Reticulated shell support joint structure and reticulated shell support joint connection construction method | |
| CN103727362A (en) | Construction technology used for quickly replacing high-strength placing anchor bolts in concrete | |
| CN207659978U (en) | The pre-stressed steel pipe concrete tension binder for preventing cushion cap from shifting | |
| CN112942364A (en) | Self-balancing large-span deep foundation pit prestressed beam system | |
| CN206035050U (en) | Prefabricated bulkhead underground granary of slot -in type endocyst plastics | |
| CN201460373U (en) | Bracing wire bar tower foundation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |