CN204645055U - Shaped steel cement earth pile, easily abolish the bracing of deep foundation pit of anchor pole, automatically monitoring and warning - Google Patents

Abstract

The utility model discloses a steel cement soil pile, an easy-to-break anchor rod, and a deep foundation pit support system with automatic monitoring and early warning. Sensors, inductive static level, stress sensor, automatic data collector, automatic monitoring and early warning system, from bottom to top, the monitoring and early warning processing system is connected with the automatic data collector, and the automatic data collector is connected with the inductive static level, stress sensor, Connect the inclination sensor; connect the inductive static level with the ground surface; connect the stress sensor with the glass fiber anchor, connect the glass fiber anchor with the anchor head, and connect the anchor head with the connecting beam; connect the inclination sensor with the pile circumference; connect the pile circumference with the cement soil , the cement soil is respectively connected with the section steel, the borehole and the side wall of the foundation pit. The structure is simple, the construction is convenient, and the process connection is simple. It is especially suitable for deep and large foundation pit engineering support with complex surrounding environment and high safety requirements.

Description

Deep foundation pit support system with steel cement-soil piles, easy-to-break anchor rods, and automatic monitoring and early warning

technical field

The utility model relates to the field of foundation pit support technology, and more specifically relates to a deep foundation pit support system with steel cement-soil piles, easy-to-break anchor rods, and automatic monitoring and early warning.

Background technique

With the development of high-rise buildings and the development and utilization of urban underground space, there are more and more foundation pit projects. The foundation pit support project is an important measure related to the construction progress and safety of many construction projects. It often takes a very high price and a long time to complete a deep and large foundation pit under complex geological conditions, which is one of the "hardest bones to crack". Foundation pit support is also a temporary measure project. After the basement is completed and backfilled, the support task will be completed thereupon. However, this short-term process is often accompanied by a large number of permanent obstacles buried underground (such as reinforced concrete for bored piles, reinforced steel strands for anchor rods, etc.), which brings hidden dangers to future sustainable development. In some areas of our country, there is even a rigid regulation that the foundation pit support structure cannot exceed the red line of the land, which directly limits the application of anchor rods (cables). As the country's requirements for environmental protection and resource conservation are getting higher and higher, it is the general trend to realize the green environmental protection of foundation pit support engineering construction.

The existing patents are related to the technology of section steel used for foundation pit support. For example:

1. Qin Hao invented a deep foundation pit built-in section steel pull-out unreinforced cast-in-situ pile (ZL: CN201410007380), including section steel and plain concrete, section steel can be recycled and reused, and construction efficiency is improved at the same time. The disadvantage is that plain concrete is used as the backfill in the pile, which has high strength, and waste concrete will be left in the surrounding soil, which will affect the subsequent underground construction.

2. He Shiming invented a long helical rotary jet mixing cement-soil type steel pile foundation pit water stop support method (ZL: CN201210509637), which uses a long auger drill to form a hole, and the original soil layer and cement slurry are mixed by rotary jetting on the spot, and then inserted Shaped steel, etc. form a cement-soil shaped steel pile body with certain strength and impermeability. The advantage is that it can form a closed and continuous high-strength pile wall in general soil layers, and the section steel, anchor rod or inner support can be recycled and reused. The disadvantage is that the pile-forming method is only applicable to moderately soft and hard strata, and is not suitable for flow-plastic soft soil, hard clay or pebble strata, and weathered rock strata.

3. He Shiming invented the manual excavation cement-soil-shaped steel pile foundation pit support method (ZL: CN201210509644), that is, the cylindrical pile hole is manually dug, the steel is hoisted, and the cement-soil slurry is poured to form a cement-soil-shaped steel pile. Set up connecting beams, and when the foundation pit is deep, use internal support or detachable anchor rods for composite support, and hang net shotcrete on the side of the foundation pit during excavation. The utility model has the advantages of adapting to the relatively hard soil layer in the northern region, the section steel can be recycled, and the cost is reduced. The disadvantage is that the manual digging method is not suitable for the situation of groundwater, and has been banned in some provinces and regions; in addition, the method of pouring cement-soil slurry into the hole is not conducive to the improvement of construction efficiency.

Fiberglass anchor (or FRP anchor) is a new type of reinforcement material composed of resin and glass fiber. It has high strength, light weight, good mechanical properties such as impact resistance and corrosion resistance, and its technology has become mature. . At present, it has been successfully applied in many fields such as coal mine roadway, semi-coal rock roadway support, slope support, rock face anchor protection, etc., but there is currently no patent information on the application of glass fiber bolts in foundation pit support engineering. The reason may be related to the lack of effective information feedback methods and means when glass fiber bolts are used in foundation pit support, which makes the application of this new technology in foundation pit support engineering very cautious.

Monitoring is a necessary means to ensure the safety of the foundation pit and surrounding environment. A foundation pit wireless monitoring and alarm device and its monitoring method invented by Li Renmin (ZL: CN201010580674) relate to the technical field of foundation pit engineering wireless automatic monitoring and alarm system, but there is no specific method or software processing system for its monitoring and early warning. Others, such as the wireless foundation pit automatic monitoring system invented by Li Siding (ZL: CN201420426854), and the wireless monitoring and early warning system of deep foundation pit comprehensive parameters invented by Xiao Jinqiu (ZL: CN201410318451), all focus on the improvement of wireless transmission methods, while for key monitoring Low-cost acquisition methods of parameters, data processing and early warning feedback are rarely involved. In addition, because the bolt is a key adjustable factor to ensure the safety of the foundation pit, the existing patents do not focus on the informationization of the dynamic adjustment of the bolt.

Contents of the invention

The purpose of this utility model is to provide a deep foundation pit support system with steel cement-soil piles, easy-to-break anchor rods, and automatic monitoring and early warning. The structure is simple, the construction is convenient, and the process is simple. , Foundation pit engineering support with complex surrounding environment and high safety requirements.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical measures:

A deep foundation pit support system with steel cement-soil piles, easy-to-break anchors and automatic monitoring and early warning, which includes steel-cement-soil piles including steel, cement-soil, and connecting beams, easy-to-break anchors including glass fiber anchors and anchor heads The automatic monitoring and early warning system includes Whmonisys-3.0 monitoring and early warning processing system, WhdataAcq automatic data acquisition instrument, inductive static force level, stress sensor, and tilt sensor; it is characterized in that: from bottom to top, the monitoring and early warning processing system is connected with the automatic data acquisition instrument , the automatic data acquisition instrument is connected with the inductive static level, the stress sensor and the inclination sensor respectively; the inductive static level is connected with the ground surface; the stress sensor is connected with the glass fiber anchor, the glass fiber anchor is connected with the anchor head, and the anchor head is connected with the connecting beam Connection, the first connecting beam is connected with the section steel; the inclination sensor is connected with the circumference of the pile;

Working mechanism:

After the steel cement-soil piles, connecting beams, easy-to-break anchor rods and automatic monitoring and early warning system are installed, a stable foundation pit support and early warning system has been formed; during the continuous excavation of the foundation pit, the soil and water around the foundation pit are generated Lateral pressure deforms the support piles and anchor rods; the steel cement soil piles play the role of cantilever support and cut-off wall, and the connecting beams connect the steel cement soil piles to increase the overall support capacity, while the joint beams connect the steel cement soil piles to increase the overall support capacity. The easy-to-break anchors connected to the beams provide tension for the connecting beams and the steel cement-soil piles, preventing tilting or moving into the foundation pit, thereby forming an overall support system for the foundation pit; they are respectively installed on the ground surface, steel cement-soil piles, and glass fiber anchors The settlement, inclination, and stress sensor data on the platform are collected in real time by the automatic data collector, and processed by the monitoring and early warning processing system to judge the working status of the foundation pit in a timely manner, and give an alarm when abnormal data occurs, reminding relevant parties to adjust the glass fiber anchor in time Measures such as the number and length of rods, so as to provide material and information guarantee for the safety and stability of the foundation pit to the greatest extent. At the same time, the recovery of profiled steel and sensors after backfilling the foundation pit, and the failure of easy-to-break anchor rods improve the reliability of the foundation pit support system. performance, economy and environmental protection.

The utility model has the following advantages and positive effects:

①The hole-forming method of the pile can be applied to pebble or hard clay stratum, high groundwater level stratum, general stratum and weak or medium weathered bedrock, with convenient construction, simple structure, simple process connection, and no special and complicated construction technology;

② Recycling of steel materials and sensors saves a lot of resources and greatly reduces the project cost; after the support is completed, it avoids residual construction waste that is difficult to remove;

③Realize real-time monitoring and early warning of foundation pit safety, ensure the safety of the construction process, and realize information-based construction based on real-time monitoring and adjustment of bolts;

④ It is especially suitable for deep foundation pit support projects in cities that are deep, large, complex surrounding environment, and have high safety requirements.

A foundation pit support project adopting the present invention has an area of 8000m ² and a maximum depth of 20m. It adopts Q345 63b I-shaped steel with a length of 20-27m. It adopts 5 rows of GFRP glass fiber anchor rods with a diameter of 28mm. The pulling force is 20-30T, and the length is 15-20m. During the construction of the foundation pit, the maximum horizontal displacement monitored was 35.6mm, and the maximum settlement was 30.2mm. During the foundation pit construction, the monitoring and early warning system gave an instant warning that the stress of the two anchor rods in the second row exceeded the control value. The length of the adjacent glass fiber anchors was 3m and the measures of adding 2 anchors were lifted. The foundation pit maintained good stability during the whole construction process, and the project cost was also reduced by about 20% compared with the conventional support method.

The application of this utility model in Wuhan City has reached 5 deep foundation pit projects, and the project costs are 4.2 million yuan, 3.83 million yuan, 9.28 million yuan, 5.07 million yuan, and 12.16 million yuan. According to the technical and economic comparison data provided by the owner , The utility model is about 830,000 yuan, 790,000 yuan, 2,400,000 yuan, 1,230,000 yuan, 3,210,000 yuan in project costs saved for the above-mentioned projects, and the accumulated cost savings is 8,460,000 yuan.

Description of drawings

Fig. 1 is a schematic plan view of a deep foundation pit support system with steel cement-soil piles, easy-to-break anchor rods, and automatic monitoring and early warning.

Fig. 2 is a schematic elevation view of a deep foundation pit support system with steel cement-soil piles, easy-to-break anchor rods, and automatic monitoring and early warning.

In the picture:

00—ground surface, 01—foundation soil, 02—foundation pit wall; 03—drilling hole;

10-shaped steel, 11-cement soil, 12-pile circumference, 13-coupling beams including the first coupling beam 13a, the second coupling beam 13b, and the third coupling beam 13c;

20—Fiberglass bolts include first fiberglass bolts 20a, second fiberglass bolts 20b, third fiberglass bolts 20c, 21—Anchor heads include first anchor heads 21a, second anchor heads 21b, third Anchor head 21c;

30 - automatic monitoring and early warning processing system, 31 - automatic data acquisition instrument, 32 - inductive static level (any type that meets the accuracy is acceptable, and can be purchased in the market), 33 - stress sensor includes the first stress sensor 33a, the first Stress sensor 33b, the 3rd stress sensor 33c (any kind that meets precision all can be purchased in the market), 34-tilt sensor includes first tilt sensor 34a, the second tilt sensor 34b, the 3rd tilt sensor 34c (satisfies precision Any one can be purchased in the market).

Detailed ways

Example 1:

According to Figure 1 and Figure 2, it can be seen that a deep foundation pit support system with steel cement soil piles, easily broken anchor rods and automatic monitoring and early warning consists of steel cement soil piles including steel 10, cement soil 11, and glass fiber anchor rods 20 Including the first glass fiber anchor 20a, the second glass fiber anchor 20b, the third glass fiber anchor 20b, the anchor head 21 includes the first anchor head 21a, the second anchor head 21b, the third anchor head 21c, the connecting beam 13 Including the first connecting beam 13a, the second connecting beam 13b, the third connecting beam 13c, the tilt sensor 34 including the first tilt sensor 34a, the second tilt sensor 34b, the third tilt sensor 34c, the electrostatic level 32, the stress sensor 33 Including the first stress sensor 33a, the second stress sensor 33b, the third stress sensor 33c, and the automatic monitoring and early warning system 30, it is characterized in that: from bottom to top, the monitoring and early warning processing system 30 is connected with the automatic data collector 31, and the data is automatically The acquisition instrument 31 is connected with the electrostatic level 32, the stress sensor 33, and the inclination sensor 34 respectively; the electrostatic level 32 is connected with the ground surface 00; the stress sensor 33 is connected with the glass fiber anchor 20, and the glass fiber anchor 20 is connected with the anchor head 21 connection, the anchor head 21 is connected with the connecting beam 13, and the connecting beam 13 is connected with the section steel 10; the inclination sensor 34 is connected with the pile circumference 12; Pit wall 02 connection.

The shaped steel cement soil pile includes shaped steel 10 and cement soil 11, and the shaped steel cement soil pile is partially overlapped by the cement soil 11.

According to Fig. 1, it can be seen that a deep foundation pit support system with steel cement soil piles, easy-to-break anchor rods, and automatic monitoring and early warning, from bottom to top, the monitoring and early warning processing system 30 is connected with the automatic data acquisition instrument 31, and the automatic data acquisition instrument 31 are respectively connected with the electrostatic level 32, the first glass fiber anchor 20a, and the first inclination sensor 34a; the electrostatic level 32 is connected with the surface 00; the first stress sensor 33a is connected with the first glass fiber anchor 20a, and the first stress sensor 33a is connected with the first glass fiber anchor 20a, A glass fiber anchor rod 20a is connected with the first anchor head 21a, the anchor head 21 is connected with the first connecting beam 13a, and the first connecting beam 13a is connected with the section steel 10; the first inclination sensor 34a is connected with the pile circumference 12; the pile circumference 12 is connected with the The cement soil 11 is connected, and the cement soil 11 is respectively connected with the section steel 10, the borehole 03 and the foundation pit wall 02; a glass fiber anchor rod 20 can be three to six rows, and the corresponding connecting beam 13 is three to six circles, and there are correspondingly There are three to six rows of stress sensors 33, three to six rows corresponding to anchor heads 21, and three to six rows corresponding to tilt sensors 34, and the connection relationship is the same. From bottom to top, the monitoring and early warning processing system 30 is connected with the automatic data acquisition instrument 31, and the automatic data acquisition instrument 31 is respectively connected with the electrostatic static level 32, the second glass fiber anchor rod 20b, and the second inclination sensor 34b; the electrostatic static level 32 is connected with the ground surface 00; the second stress sensor 33b is connected with the second glass fiber anchor 20b, the second glass fiber anchor 20b is connected with the second anchor head 21b, the anchor head 21 is connected with the second connecting beam 13b, and the second connection The beam 13b is connected to the profile steel 10; the second inclination sensor 34b is connected to the pile circumference 12; the pile circumference 12 is connected to the cement soil 11, and the cement soil 11 is respectively connected to the profile steel 10, the borehole 03 and the foundation pit wall 02. From bottom to top, the monitoring and early warning processing system 30 is connected with the automatic data collector 31, and the automatic data collector 31 is respectively connected with the electrostatic level 32, the third glass fiber anchor rod 20c, and the third tilt sensor 34c; the electrostatic level 32 is connected with the ground surface 00; the third stress sensor 33c is connected with the third glass fiber anchor 20c, the third glass fiber anchor 20c is connected with the third anchor head 21c, the anchor head 21 is connected with the third connecting beam 13c, and the third connection The beam 13c is connected to the profile steel 10; the third inclination sensor 34c is connected to the pile circumference 12; the pile circumference 12 is connected to the cement soil 11, and the cement soil 11 is respectively connected to the profile steel 10, the borehole 03 and the foundation pit wall 02.

Claims (2)

1. A deep foundation pit support system with steel cement-soil piles, easy-to-break anchors, and automatic monitoring and early warning. It consists of steel-cement soil piles including steel (10), cement-soil (11), and glass fiber anchors (20) , anchor head (21), connecting beam (13), inclination sensor (34), inductive static level (32), stress sensor (33), automatic data collector (31), automatic monitoring and early warning system (30), It is characterized in that: from bottom to top, the monitoring and early warning processing system (30) is connected with the automatic data acquisition instrument (31), and the automatic data acquisition instrument (31) is respectively connected with the electrostatic level (32), the stress sensor (33), the tilt The sensor (34) is connected; the electrostatic level (32) is connected with the ground surface (00); the stress sensor (33) is connected with the glass fiber anchor (20), and the glass fiber anchor (20) is connected with the anchor head (21), The anchor head (21) is connected with the connecting beam (13); the inclination sensor (34) is connected with the pile circumference (12); the pile circumference (12) is connected with the cement soil (11), and the cement soil (11) is respectively connected with the section steel (10) , Drilling hole (03) and foundation pit side wall (02) are connected. 2. A deep foundation pit support system with steel cement-soil piles, easy-to-break anchor rods, and automatic monitoring and early warning according to claim 1, characterized in that: cement-soil (11 ) lap.