CN-116359064-B - Roadbed water content detector and detection method

CN116359064BCN 116359064 BCN116359064 BCN 116359064BCN-116359064-B

Abstract

The invention relates to a roadbed water content detector and a detection method, which effectively solve the problems that the detection precision is low and certain potential safety hazard exists when the roadbed water content is detected; the technical scheme includes that the method comprises two water absorption detection modes of a contact type and a non-contact type with a soil sample, acetylene generated by the contact type water absorption method is firstly utilized and ignited to generate heat, so that water which is mixed in the soil sample and is difficult to contact with calcium carbide is heated to generate evaporation, further contact with the calcium carbide which is not contacted with the soil sample is realized, thorough absorption of the water in the soil sample is realized, the water content is measured and calculated through collecting carbon dioxide gas generated by combustion, and the acetylene gas generated is utilized while the accuracy of a detection result is ensured.

Inventors

ZHANG YUANLONG
XUE XIAONA
LUO YONGSHENG
ZHANG HAO
ZHAO QIYANG
JING LIN
JIN XUEJUN
WANG XUETONG
WANG HONG
ZHAO DACHUANG
WANG ZUOXUAN
ZHANG TIANHANG
FANG YANLI
GE WEI
ZHUANG XIAORUI

Assignees

河南黄河河务局工程建设中心

Dates

Publication Date: 20260505
Application Date: 20230407

Claims (9)

1. The roadbed water content detector comprises a detection barrel (1), and is characterized in that a stirring unit is arranged in the detection barrel (1), a plurality of storage air bags (2) are arranged between the upper ends of the stirring units in a surrounding mode, the storage air bags (2) are communicated with an external air supply unit, a plurality of groups of regulating air bags (3) which are arranged around the stirring unit are vertically arranged on the stirring units at the upper ends of the storage air bags (2) at intervals, and calcium carbide powder particles are stored in the storage air bags (2) and the regulating air bags (3); An annular high-pressure cavity (5) fixed on the inner wall of the detection cylinder (1) is arranged in the detection cylinder (1) above the stirring unit in a coaxial way, inert gas is stored in the annular high-pressure cavity (5), a plurality of adjusting air bags (3) are communicated with one axial side of the annular high-pressure cavity (5), and the other axial side of the annular high-pressure cavity (5) is communicated with a plurality of adjusting air bags (3) through an air pump (7); The utility model discloses a device for detecting lime water, including a detection section of thick bamboo (1), including a collection bottle (10), a detection section of thick bamboo (1), a gas-supply pipe (4), a detection section of thick bamboo (1), a conical bucket (8) and a conical bucket (8) are equipped with the coaxial heart of diapire, the conical bucket (8) is realized the intercommunication through gas-supply pipe (4) and detection section of thick bamboo (1) space that is located the stirring unit top, be equipped with ignition mechanism (35) and conical bucket (8) intercommunication in conical bucket (8) have outside oxygen supply equipment, conical bucket (8) bottom intercommunication has blast pipe (9) and blast pipe (9) other end inserts in collecting bottle (10), lime water has been stored in collecting bottle (10).
2. The roadbed water content detector according to claim 1, wherein the inner side wall of the annular high-pressure cavity (5) is triangular and comprises an upper end (12) and a lower end (13) which are connected with each other at a certain included angle, the length of the upper end (12) is greater than that of the lower end (13), and a plurality of horizontally arranged bearing rings (14) are vertically arranged on the surface of the upper end (12) at intervals.
3. The roadbed water content detector according to claim 2, wherein the stirring unit comprises a stirring shaft (15), stirring blades (16) and a plurality of groups of communicating pipes (17) are vertically arranged on the stirring shaft (15) above the stirring blades (16) at intervals, the regulating air bags (3) are communicated with the corresponding communicating pipes (17) and electric control valves (18) are arranged on the communicating pipes (17); The stirring shaft (15) is internally provided with an upward penetrating air passage (19) and the air passage (19) is connected with a conversion cavity (20) which is rotatably installed on the stirring shaft (15) in a coaxial way, two lateral sides of the conversion cavity (20) are respectively provided with a control pipe (21) which is communicated with the annular high-pressure cavity (5), and the air pump (7) is installed on one control pipe (21) and the other control pipe (21) is provided with a throttle valve (22).
4. A roadbed water content detector according to claim 3, characterized in that an air cavity (23) is arranged in a stirring shaft (15) positioned below the air passage (19) and a plurality of storage air bags (2) are communicated with the air cavity (23) through a guide pipe (24), an extension pipe (25) communicated with the air cavity (23) is coaxially arranged in the stirring shaft (15), and the extension pipe (25) upwards penetrates out of the stirring shaft (15) to be communicated with an external air supply unit.
5. The roadbed water content detector according to claim 4, wherein the storage air bag (2) is internally provided with a channel (26) in a penetrating way and the channel (26) is communicated with the guide pipe (24), the storage air bag (2) is communicated with the guide pipe (24) through a branch pipe (27), a movable column (28) which is elastically connected with the guide pipe (24) is slidably arranged in the guide pipe in a coaxial way, the movable column (28) is internally provided with a through hole (29) in a penetrating way, two axial sides of the movable column (28) are radially provided with branch holes (30) communicated with the through hole (29) along the radial direction of the movable column, and a circular plate (31) is arranged in the guide pipe (24) at one end of the movable column (28) which is far away from the stirring shaft (15) in the coaxial way, and the diameter of the circular plate (31) is slightly larger than the inner diameter of the through hole (29).
6. The roadbed water content detector according to claim 1, wherein the gas pipe (4) is provided with a pressure valve (32) and a water-proof breathable film (33) is arranged at the communication part of the gas pipe (4) and the detection cylinder (1).
7. The roadbed water content detector according to claim 1, wherein the heights of two ends of the exhaust pipe (9) are different, and one end of the exhaust pipe (9) communicated with the conical hopper (8) is lower than one end of the exhaust pipe (9) matched with the collecting bottle (10).
8. The roadbed water content detector according to claim 1, wherein a spoiler (34) is rotatably mounted in the conical hopper (8) coaxially and the spoiler (34) is driven by the stirring shaft (15).
9. A method for detecting the water content of a roadbed, which adopts the roadbed water content detector according to any one of claims 1 to 8, and is characterized by comprising the following steps: s1, firstly, putting a proper amount of soil sample into a detection cylinder; s2, introducing inert gas into the detection cylinder through an external gas supply unit until the air in the detection cylinder, the gas pipe, the conical hopper and the exhaust pipe is completely exhausted; s3, when the weight in the bottle to be collected is not increased any more, the external air supply unit is used for introducing inert gas into the storage air bag so that the storage air bag is inflated until the storage air bag is burst; s4, starting a stirring unit to uniformly mix calcium carbide powder particles with a soil sample, and enabling generated acetylene gas to enter a conical hopper through a gas pipe and burn in the conical hopper; s5, controlling the annular high-pressure cavity to fill a certain amount of inert gas into the plurality of adjusting air bags, adjusting the air bags to expand and forcing acetylene gas in the detection cylinder to be driven into the conical hopper; S6, when the air bag to be regulated is inflated to a set degree, the annular high-pressure cavity withdraws inert gas which is originally filled into the air bag to be regulated; S7, repeating the steps S5-S6 at regular intervals, and controlling the annular high-pressure cavity to introduce excessive gas into a group of a plurality of adjusting air bags below and expand and burst the air bags when the air humidity in the detection cylinder reaches a certain degree; and S8, when the process to be detected enters the tail stage, controlling the annular high-pressure cavity to introduce excessive gas into a group of a plurality of adjusting air bags positioned above and enabling the air bags to expand and burst.

Description

Roadbed water content detector and detection method Technical Field The invention relates to the technical field of roadbed construction detection, in particular to a roadbed water content detector and a roadbed water content detection method. Background The compactness of the roadbed is ensured during roadbed construction, the factors influencing the compaction effect of the roadbed comprise an internal factor and an external factor, wherein the internal factor refers to soil quality and humidity, the external factor refers to compaction function, external natural factors, artificial other factors and the like during compaction, the humidity of the roadbed soil body is one of important factors influencing the roadbed construction quality, and the humidity of the roadbed soil body is one of the most concerned problems of road engineers in roadbed construction quality control; the existing roadbed water content measuring method comprises a drying method, an alcohol combustion method, a capacitance method, a calcium carbide weightlessness method and the like, when the drying method is adopted for detection, the result is accurate, influence factors are few, but the baking time is too long (less for 6-8 hours and more for 8-10 hours), and the construction progress of engineering can be influenced for highway construction; the alcohol combustion method is suitable for rapidly and simply measuring the water content of fine-grained soil, but the measurement result is quite different from the actual situation, because the viscous soil is difficult to burn by alcohol, and the wet soil is difficult to crush, the accuracy of the alcohol combustion method is also reduced; the capacitance method has the advantages of simplicity, rapidness and convenience, can perform on-site measurement, and has the defects of larger error when the measurement range is limited, for example, the water content reaches more than 20 percent of a soil sample (the conductivity difference of different soil bodies is larger, and the error when the content of organic matters is different and the water content is high); The calcium carbide weight loss method, namely, the water content of the roadbed is measured by absorbing water in the soil sample through calcium carbide and detecting the amount of acetylene gas generated by reaction, and the method is widely applied to the detection of the water content of the roadbed during road construction because the method is less influenced by the testing environment factors and the artificial factors, and the detection speed is high and is not limited by indoor and outdoor conditions, but when the calcium carbide is mixed with the soil sample, the method is basically difficult to realize that the calcium carbide is contacted with all water contained in the soil sample and reacts to generate the acetylene gas, so that the detection result is deviated from the actual result, the acetylene gas generated by reaction has inflammable characteristics, and has certain potential safety hazards if the acetylene gas is discharged into the air, and in addition, when the detection process is carried out indoors, the situation that the detector generates poisoning is caused if gas leakage occurs (acetylene has an anesthetic effect, and phenomena such as hypoxia symptom, dizziness, nausea and vomiting occur when the concentration of the acetylene gas is high); in view of the above, we provide a roadbed water content detector and a detection method for solving the above problems. Disclosure of Invention The invention provides a roadbed water content detector and a detection method, wherein the roadbed water content detector comprises a contact type water absorption detection mode and a non-contact type water absorption detection mode with a soil sample, acetylene generated by the contact type water absorption method is firstly utilized and ignited to generate heat, so that water which is mixed in the soil sample and is difficult to contact with calcium carbide is heated to be evaporated, further contact with the calcium carbide which is not contacted with the soil sample is realized, thorough absorption of water in the soil sample is realized, the water content is measured and calculated through collecting carbon dioxide gas generated by combustion, and the generated acetylene gas is utilized while the accuracy of a detection result is ensured. The roadbed water content detector comprises a detection barrel, and is characterized in that a stirring unit is arranged in the detection barrel, a plurality of storage air bags are arranged between the upper ends of the stirring units in a surrounding mode, the storage air bags are communicated with an external air supply unit, a plurality of groups of regulating air bags arranged around the stirring units are vertically arranged on the stirring units at the upper ends of the storage air bags at intervals, and calcium carbide powder is stored in the storage air bags and the re