CN114705174A - Deep foundation pit retaining structure deformation remote monitoring system - Google Patents

Deep foundation pit retaining structure deformation remote monitoring system Download PDF

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Publication number
CN114705174A
CN114705174A CN202210295917.3A CN202210295917A CN114705174A CN 114705174 A CN114705174 A CN 114705174A CN 202210295917 A CN202210295917 A CN 202210295917A CN 114705174 A CN114705174 A CN 114705174A
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China
Prior art keywords
enclosure
resistor
coil
triode
delay
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Pending
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CN202210295917.3A
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Chinese (zh)
Inventor
邱梁
吴洁
谢赛格
汪丽丽
俞嘉辉
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Zhongyuan Construction Group Co ltd
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Zhongyuan Construction Group Co ltd
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Priority to CN202210295917.3A priority Critical patent/CN114705174A/en
Publication of CN114705174A publication Critical patent/CN114705174A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G01C15/10—Plumb lines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

The application discloses deep basal pit envelope warp remote monitering system, including setting up in the inboard branch of enclosure, branch deviates from the one end fixedly connected with of enclosure and connects the rope, connect rope lower extreme fixedly connected with weight, the weight is provided with the detection device who is used for detecting enclosure deformation, the enclosure is provided with the warning mechanism that is used for warning personnel, detection device is connected with warning mechanism, detection device can open and close according to enclosure deformation condition control warning mechanism. This application has the effect of being convenient for monitor.

Description

Deep foundation pit retaining structure deformation remote monitoring system
Technical Field
The application relates to the field of deep foundation pits, in particular to a remote monitoring system for deformation of a deep foundation pit support structure.
Background
Along with the development of cities, the scale of foundation pits and the excavation depth are continuously increased, and the safety problem of the deep foundation pits becomes a primary consideration for engineering construction. Because the soil body, building around the foundation ditch excavation and buried the thing and can cause the deformation of foundation ditch enclosure wall structure wall body (for short foundation ditch enclosure wall, underground continuous wall for example) etc. to extrude, so will monitor foundation ditch enclosure wall structure wall body in the foundation ditch work progress, present monitoring is mostly artifical regularly monitoring, and the waste time is not convenient for monitor.
Disclosure of Invention
In order to facilitate the monitoring, the application provides a deep foundation pit envelope deformation remote monitering system.
The application provides a pair of deep basal pit retaining structure warp remote monitering system adopts following technical scheme:
the utility model provides a deep basal pit retaining structure warp remote monitering system, is including setting up in the inboard branch of enclosure, branch deviates from the one end fixedly connected with of enclosure and connects the rope, connect rope lower extreme fixedly connected with weight, the weight is provided with the detection device who is used for detecting enclosure deformation, the enclosure is provided with the warning mechanism that is used for warning personnel, detection device is connected with warning mechanism, detection device can open and close according to enclosure deformation condition control warning mechanism.
By adopting the technical scheme, the connecting rope can be kept in a vertical state by utilizing the gravity of the heavy hammer, and when the enclosure deforms and is inclined towards the direction deviating from the inner wall of the foundation pit, the distance between the heavy hammer and the enclosure changes, so that the detection device can detect the change of the distance and further control the warning mechanism to be opened, and the warning mechanism can remind a worker to check and maintain the foundation pit in the front and is convenient to monitor.
Optionally, the warning mechanism includes the support of fixed connection in enclosure upper end, support fixedly connected with stopper, the stopper slides and wears to be equipped with the lifter, the lifter upper end is provided with LED, the enclosure is provided with the drive assembly who is used for the reciprocal lift of drive lifter, drive assembly connects in the lifter, and drive assembly is connected with detection device.
By adopting the technical scheme, the detection device controls the driving assembly to be started, and the driving assembly drives the lifting rod to move in a reciprocating manner and extend out of the foundation pit, so that personnel can be obviously reminded, and the enclosure deforms.
Optionally, the drive assembly includes fixed connection in the driving motor who encloses, driving motor output shaft fixedly connected with connecting rod, connecting rod fixedly connected with drive block, lifter lower extreme fixedly connected with arc piece, the arc side of arc piece sets up along the rotation orbit of drive block, the arc concave side of arc piece sets up downwards, just the both ends of arc piece are fixedly connected with respectively and extend the piece, the intercommunication groove of mutual intercommunication is all seted up with extending the piece to the arc piece, the drive block slides and wears to locate in the intercommunication inslot.
Through adopting above-mentioned technical scheme, driving motor starts, drives the connecting rod and rotates, makes the drive block slide in the intercommunication inslot to drive the arc piece and can reciprocate, and then make the lifter can the oscilaltion, warn the staff.
Optionally, the detection device includes:
the distance sensor is arranged on the side wall of the heavy hammer, which faces the enclosure, and is used for detecting the distance change between the heavy hammer and the enclosure and outputting a distance detection signal;
the comparison circuit is connected with the output end of the distance sensor, presets a distance reference value, receives a distance detection signal and outputs a comparison signal; and the number of the first and second groups,
and the control circuit is connected with the output end of the comparison circuit and the driving motor, receives the comparison signal and outputs a control signal for controlling the driving motor to be opened and closed based on the comparison signal.
By adopting the technical scheme, the distance sensor detects the distance between the heavy hammer and the enclosure in real time and sends the detected distance in the form of a distance detection signal, the comparison circuit receives the distance detection signal, converts the distance detection signal into a corresponding distance detection value, compares the distance detection value with a distance reference value and then outputs a comparison signal, and the control circuit receives the comparison signal and controls the driving motor to be started and stopped.
Optionally, the comparison circuit includes a comparator a and a reference circuit, and the reference circuit includes a first resistor R1 and a second resistor R2; wherein the content of the first and second substances,
the positive phase input end of the comparator A is connected with the output end of the distance sensor, and the negative phase input end of the comparator A is connected with the first resistor R1;
one end of the first resistor R1 is connected with the inverting input end of the comparator A, and the other end of the first resistor R1 is connected with a power supply VCC;
the second resistor R2 has one end connected to ground and the other end connected to the connection point of the first resistor R1 and the inverting input terminal of the comparator a.
By adopting the technical scheme, the reference circuit is used for setting the distance reference value, the comparator A is used for comparing the distance detection value with the distance reference value, and when the distance detection value is greater than the distance reference value, the comparator A outputs a high level.
Optionally, the control circuit includes a first triode Q1, a delay unit, a first relay KM1, a third resistor R3, and a second triode Q2; wherein the content of the first and second substances,
the base of the first triode Q1 is connected with the output end of the comparator A, and the emitter is grounded;
one end of the LED is connected to a power supply VCC, and the other end of the LED is connected to a collector of a first triode Q1;
the first relay KM1 comprises a first coil and a normally open contact KM1-1, wherein one end of the first coil is grounded, and the other end of the first coil is connected to a power supply VCC; one end of a normally open contact KM1-1 is connected to a power supply VCC, and the other end of the normally open contact KM1-1 is connected to a third resistor R3;
the input end of the delay unit is connected with the connection point of the LED and the collector electrode of the first triode Q1, and the output end of the delay unit is connected between a power supply VCC and the first coil;
one end of the third resistor R3 is connected with a normally open contact KM1-1, and the other end of the third resistor R3 is connected with the base electrode of the second triode Q2; and the number of the first and second groups,
and the base of the second triode Q2 is connected with the third resistor R3, the emitter is grounded, and the collector is connected in a power supply loop of the driving motor.
Through adopting above-mentioned technical scheme, when comparator A output high level, first triode Q1 switches on, and the delay unit switches on, and LED is bright, and first relay KM 1's first coil gets electric simultaneously, and normally open contact KM1-1 is closed, and second triode Q2 switches on, and driving motor opens.
Optionally, the delay unit includes a delay relay KT1, the delay relay KT1 includes a delay coil and a normally open contact KT1-1 which is closed in a delayed manner, one end of the delay coil is connected to a collector of the first triode Q1, and the other end of the delay coil is connected to the LED; one end of a normally open contact KT1-1 which is closed in a time-delay way is connected with a power supply VCC, and the other end of the normally open contact KT1-1 which is closed in a time-delay way is connected with a first coil.
Through adopting above-mentioned technical scheme, when comparator A output high level, first triode Q1 switches on, and time delay relay KT1 gets electric, and LED is bright simultaneously, and the closed normally open contact KT1-1 of time delay is closed in the time delay, and first coil of first relay KM1 gets electric.
Optionally, the first coil is connected with a buzzer, the buzzer is an active buzzer, one end of the buzzer is connected to the first coil, and the other end of the buzzer is grounded.
Through adopting above-mentioned technical scheme, when comparator A output high level, first triode Q1 switches on, and time delay relay KT1 gets electric, and the closed normally open contact KT1-1 of time delay is closed in the time delay, and bee calling organ opens to call personnel that can be better.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the gravity that utilizes the weight, make the rope of connecting can keep vertical state, and when the enclosure warp to produce the orientation and deviate from the direction slope of foundation ditch inner wall, the distance change between weight and the enclosure produces the change to detection device can detect the distance change, and then control warning mechanism and open, warning mechanism can remind the staff to look over the maintenance in the future, is convenient for monitor.
2. The distance sensor detects the distance between the heavy hammer and the enclosure in real time and sends the detected distance in the form of a distance detection signal, the comparison circuit receives the distance detection signal, converts the distance detection signal into a corresponding distance detection value, compares the distance detection value with a distance reference value and then outputs a comparison signal, and the control circuit receives the comparison signal and controls the driving motor to be started and stopped.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an enclosure in the embodiment of the present application.
Fig. 3 is a schematic structural diagram of an arc-shaped block in the embodiment of the present application.
Fig. 4 is a circuit diagram of a detection device in an embodiment of the present application.
Description of reference numerals:
1. a strut; 11. connecting ropes; 12. a weight; 2. a detection device; 3. a warning mechanism; 31. a support; 32. a limiting block; 33. a lifting rod; 34. an LED; 4. a drive assembly; 41. a drive motor; 42. a connecting rod; 43. a drive block; 44. an arc-shaped block; 45. an extension block; 46. a communicating groove; 21. a distance sensor; 22. a comparison circuit; 23. a control circuit; 24. and a delay unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-4.
The embodiment of the application discloses deep basal pit retaining structure warp remote monitering system. Referring to fig. 1 and 2, the remote monitoring system for deformation of the deep foundation pit support structure comprises a support rod 1 arranged on the inner side of the support, wherein the support rod 1 is horizontally arranged, a connecting rope 11 is fixed at one end of the support rod 1, which is far away from the support, and a heavy hammer 12 is fixed at the lower end of the connecting rope 11, so that the connecting rope 11 is kept in a straight state. The heavy hammer 12 is fixed with a detection device 2 for detecting the deformation of the enclosure. The enclosure is provided with a warning mechanism 3 for warning personnel, and when the detection device 2 detects that the enclosure is deformed, the warning mechanism 3 can be controlled to be started, so that the warning personnel can check the deformation in the future.
Referring to fig. 2, warning mechanism 3 is including welding in support 31 of enclosing the upper end, and support 31 is vertical setting, and the welding of support 31 lateral wall is horizontally stopper 32, and stopper 32 welds in support 31 upper end, and stopper 32 wears to be equipped with along longitudinal sliding and is vertical lifter 33, and lifter 33 upper end bonds and has LED34, and the enclosure is provided with the drive assembly 4 that is used for the reciprocal lift of drive lifter 33.
Referring to fig. 3, the driving assembly 4 includes a driving motor 41 fixed to the upper end of the enclosure through a screw, an output shaft of the driving motor 41 is horizontally arranged, an output shaft of the driving motor 41 is fixed with a vertical connecting rod 42, one end of the connecting rod 42 departing from the output shaft of the driving motor 41 is welded with a driving block 43 which is horizontally arranged, the driving block 43 is cylindrically arranged, and the driving block 43 is located on one side of the connecting rod 42 departing from the driving motor 41.
Referring to fig. 3, an arc-shaped arc block 44 is welded to the lower end of the lifting rod 33, the arc-shaped concave side of the arc block 44 faces downward, and the arc radius of the arc block 44 is equal to the length of the connecting rod 42. The both ends of arc piece 44 integrated into one piece have respectively and extend piece 45, extend piece 45 and arc piece 44 and all offer the intercommunication groove 46 that supplies the drive block 43 to slide and wear to establish towards one side lateral wall of drive block 43. When the upper end of the lifting rod 33 is at the highest position, the rotating axis of the driving block 43 is concentric with the circle center of the arc-shaped block 44, and meanwhile, the driving motor 41 drives the connecting rod 42 to rotate, so that the driving block 43 slides in the communicating groove 46, and the driving block 43 can drive the arc-shaped block 44 to move in a reciprocating manner, so that the lifting rod 33 can lift in a reciprocating manner, and further, workers can be reminded.
Referring to fig. 2 and 4, the detecting device 2 includes a distance sensor 21, a comparing circuit 22 and a control circuit 23, the distance sensor 21 is fixed on a side wall of the weight 12 facing the enclosure, and the distance sensor 21 is a positive coefficient sensor for detecting a distance change between the weight 12 and the enclosure in real time and outputting a distance detecting signal.
Referring to fig. 4, the comparison circuit 22 includes a comparator a and a reference circuit, and the reference circuit includes a first resistor R1 and a second resistor R2 for setting a distance reference value, where the distance reference value is a distance between the weight 12 and the enclosure when the rod 1 is in the horizontal state. Wherein the positive phase input terminal of the comparator a is connected to the output terminal of the distance sensor 21, and the negative phase input terminal is connected to the first resistor R1; a first resistor R1, one end of which is connected to the inverting input terminal of the comparator a and the other end of which is connected to the power supply VCC; the second resistor R2 has one end connected to ground and the other end connected to the connection point of the first resistor R1 and the inverting input of the comparator a. The comparator A receives the distance detection signal, converts the distance detection signal into a corresponding distance detection value in real time, and compares the distance detection value with a distance reference value; when the distance detection value is greater than the distance reference value, the comparator a outputs a high level.
Referring to fig. 4, the control circuit 23 includes a first transistor Q1, a delay unit 24, a first relay KM1, a third resistor R3, and a second transistor Q2; the first triode Q1 is an NPN type triode, the base electrode of the first triode Q1 is connected with the output end of the comparator A, and the emitting electrode of the first triode Q1 is grounded; one end of the LED34 is connected to a power supply VCC, and the other end of the LED34 is connected to the collector of the first triode Q1; the first relay KM1 comprises a first coil and a normally open contact KM1-1, wherein one end of the first coil is connected to a power supply VCC, the other end of the first coil is connected with a buzzer, the buzzer is an active buzzer, one end of the buzzer is connected to the first coil, and the other end of the buzzer is grounded; one end of a normally open contact KM1-1 is connected to a power supply VCC, and the other end of the normally open contact KM1-1 is connected to a third resistor R3;
referring to fig. 4, the delay unit 24 includes a delay relay KT1, the delay relay KT1 includes a delay coil and a normally open contact KT1-1 that is closed in a delayed manner, one end of the delay coil is connected to a collector of the first triode Q1, and the other end of the delay coil is connected to the LED 34; one end of a normally open contact KT1-1 which is closed in a time-delay way is connected with a power supply VCC, and the other end of the normally open contact KT1-1 which is closed in a time-delay way is connected with a first coil. One end of a third resistor R3 is connected with a normally open contact KM1-1, and the other end is connected with the base electrode of a second triode Q2; and a second triode Q2, wherein the base electrode of the second triode Q2 is connected with the third resistor R3, the emitter electrode of the second triode Q2 is grounded, and the collector electrode of the second triode Q2 is connected with the power supply loop of the driving motor 41. When the comparator A outputs a high level, the first triode Q1 is conducted, the delay relay KT1 is electrified, the LED34 is bright, the normally open contact KT1-1 of the delay closing is closed in a delay mode, the first coil of the first relay KM1 is electrified, the buzzer is opened, the normally open contact KM1-1 is closed, the second triode Q2 is conducted, and the driving motor 41 is started.
The implementation principle of the embodiment of the application is as follows: when the enclosure is deformed and inclined, the connecting rope 11 is stretched straight all the time under the action of the gravity of the heavy hammer 12, so that the distance between the heavy hammer 12 and the enclosure is increased, the distance sensor 21 detects the distance change and outputs a distance detection signal, the comparator A receives the distance detection signal, when the distance detection value is larger than a distance reference value, the comparator A outputs a high level, the first triode Q1 is switched on, the time-delay relay KT1 is powered on, the LED34 is powered on, the normally-open contact KT1-1 which is closed in a time-delay manner, the first coil of the first relay KM1 is powered on, the buzzer is switched on, the normally-open contact KM1-1 is closed, the second triode Q2 is switched on, and the driving motor 41 is switched on; therefore, the driving block 43 slides in the communicating groove 46, the arc-shaped block 44 is driven to move up and down, the lifting rod 33 can move up and down and extend out of the foundation pit, meanwhile, the LED34 is bright, and the buzzer gives an alarm, so that the working personnel can be obviously reminded that the corresponding enclosure deforms.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a deep basal pit retaining structure warp remote monitering system which characterized in that: including setting up in branch (1) of enclosure inboard, branch (1) deviates from one end fixedly connected with of enclosure and connects rope (11), connect rope (11) lower extreme fixedly connected with weight (12), weight (12) are provided with detection device (2) that are used for detecting the enclosure deformation, the enclosure is provided with warning mechanism (3) that are used for warning personnel, detection device (2) are connected with warning mechanism (3), detection device (2) can be opened and close according to enclosure deformation condition control warning mechanism (3).
2. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 1, wherein: warning mechanism (3) are including support (31) of fixed connection in enclosure upper end, support (31) fixedly connected with stopper (32), stopper (32) slide and wear to be equipped with lifter (33), lifter (33) upper end is provided with LED (34), the enclosure is provided with drive assembly (4) that are used for driving lifter (33) reciprocal lift, drive assembly (4) are connected in lifter (33), and drive assembly (4) are connected with detection device (2).
3. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 2, wherein: drive assembly (4) are including fixed connection in the driving motor (41) of enclosure, driving motor (41) output shaft fixedly connected with connecting rod (42), connecting rod (42) fixedly connected with drive block (43), lifter (33) lower extreme fixedly connected with arc piece (44), the rotation orbit setting of drive block (43) is followed to the arc side of arc piece (44), the arc concave side of arc piece (44) sets up towards below, just fixedly connected with extension piece (45) respectively at the both ends of arc piece (44), intercommunication groove (46) that communicate each other are all seted up with extension piece (45) to arc piece (44), drive block (43) slide and wear to locate in intercommunication groove (46).
4. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 3, wherein: the detection device (2) comprises:
the distance sensor (21) is arranged on the side wall of the heavy hammer (12) facing the enclosure and used for detecting the distance change between the heavy hammer (12) and the enclosure and outputting a distance detection signal;
the comparison circuit (22) is connected with the output end of the distance sensor (21), presets a distance reference value, receives a distance detection signal and outputs a comparison signal; and the number of the first and second groups,
and the control circuit (23) is connected with the output end of the comparison circuit (22) and the drive motor (41), receives the comparison signal and outputs a control signal for controlling the on-off of the drive motor (41) based on the comparison signal.
5. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 4, wherein: the comparison circuit (22) comprises a comparator A and a reference circuit, wherein the reference circuit comprises a first resistor R1 and a second resistor R2; wherein the content of the first and second substances,
the positive phase input end of the comparator A is connected with the output end of the distance sensor (21), and the negative phase input end of the comparator A is connected with the first resistor R1;
one end of the first resistor R1 is connected with the inverting input end of the comparator A, and the other end of the first resistor R1 is connected with a power supply VCC;
the second resistor R2 has one end connected to ground and the other end connected to the connection point of the first resistor R1 and the inverting input terminal of the comparator a.
6. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 4, wherein: the control circuit (23) comprises a first triode Q1, a time delay unit (24), a first relay KM1, a third resistor R3 and a second triode Q2; wherein the content of the first and second substances,
the base of the first triode Q1 is connected with the output end of the comparator A, and the emitter is grounded;
one end of the LED (34) is connected to a power supply VCC, and the other end of the LED (34) is connected to a collector of a first triode Q1;
the first relay KM1 comprises a first coil and a normally open contact KM1-1, wherein one end of the first coil is grounded, and the other end of the first coil is connected to a power supply VCC; one end of a normally open contact KM1-1 is connected to a power supply VCC, and the other end of the normally open contact KM1-1 is connected to a third resistor R3;
the input end of the delay unit (24) is connected with the connection point of the LED (34) and the collector electrode of the first triode Q1, and the output end of the delay unit is connected between a power supply VCC and the first coil;
one end of the third resistor R3 is connected with a normally open contact KM1-1, and the other end of the third resistor R3 is connected with the base electrode of the second triode Q2; and the number of the first and second groups,
and the base of the second triode Q2 is connected with the third resistor R3, the emitter is grounded, and the collector is connected with a power supply loop of the driving motor (41).
7. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 6, wherein: the delay unit (24) comprises a delay relay KT1, the delay relay KT1 comprises a delay coil and a normally open contact KT1-1 closed in a delayed mode, one end of the delay coil is connected to a collector electrode of the first triode Q1, and the other end of the delay coil is connected to the LED (34); one end of a normally open contact KT1-1 which is closed in a time-delay way is connected with a power supply VCC, and the other end of the normally open contact KT1-1 which is closed in a time-delay way is connected with a first coil.
8. The remote monitoring system for the deformation of the deep foundation pit enclosure structure according to claim 6, wherein: the first coil is connected with a buzzer, the buzzer is an active buzzer, one end of the buzzer is connected with the first coil, and the other end of the buzzer is grounded.
CN202210295917.3A 2022-03-24 2022-03-24 Deep foundation pit retaining structure deformation remote monitoring system Pending CN114705174A (en)

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CN113789822A (en) * 2021-10-20 2021-12-14 宁波数绘信息科技有限公司 Foundation pit monitoring device
CN215984406U (en) * 2021-07-08 2022-03-08 西安建大维固工程检测鉴定有限公司 Building deformation detection device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205748367U (en) * 2016-06-24 2016-11-30 安徽中汇规划勘测设计研究院股份有限公司 Sensor is monitored in a kind of horizontal displacement automatically
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CN214537966U (en) * 2021-05-28 2021-10-29 珠海经济特区建设监理有限公司 Main structure of green environment-friendly assembly type building
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