Precipitation construction method suitable for high-pressure-bearing deep foundation pit

Abstract

The invention discloses a dewatering construction method suitable for a high-pressure-bearing deep foundation pit, which comprises the following steps: A, firstly, after construction of a support structure of the deep foundation pit is completed, excavating a dewatering well at the bottom of the foundation pit; b, a plurality of drainage grooves are dug in an upper opening of the dewatering well; c, the upper port of the dewatering well is reinforced and protected; d, longitudinal stand columns are installed on the inner wall of the dewatering well, and water level sensor sets are installed on the outer walls of the stand columns; e, a water suction pump is installed at the bottom of the dewatering well, the water outlet end of the water suction pump is connected with a drainage pipeline, the drainage pipeline extends out of the deep foundation pit to conduct drainage, and it is guaranteed that the bottom of the deep foundation pit is in a water-free environment. And the construction safety and the construction efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of dewatering construction, and in particular to a dewatering construction method suitable for a high-pressure deep foundation pit. Background Art

[0002] In the construction of construction projects, urban rail transit and other projects, the well point dewatering method is generally used for the dewatering of deep foundation pits in construction basements and urban rail transit underground stations. This method is used in construction environments with relatively high groundwater levels. It is an important technical measure in the construction of earthwork, foundation and foundation engineering. It can drain the moisture in the base soil, promote soil consolidation, and improve the strength of the foundation. At the same time, it can reduce the lateral displacement and settlement of the soil slope, stabilize the slope, eliminate quicksand, and reduce the uplift of the base soil. The foundation and foundation engineering construction located below the natural groundwater can avoid the influence of groundwater, provide relatively dry construction conditions, and reduce the amount of earthwork, shorten the construction period, improve the quality of the project and ensure construction safety. The well point method of drainage is suitable for foundation pits with powder, fine sand or high groundwater levels, deep foundation excavation, unstable pit walls, and ordinary drainage methods that are difficult to solve. The current drainage method for high-pressure deep foundation pits has poor drainage effect and affects construction safety. Therefore, it is necessary to improve it. Summary of the invention

[0003] The object of the present invention is to provide a dewatering construction method suitable for a high-pressure deep foundation pit, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a dewatering construction method suitable for a high-pressure deep foundation pit, the construction method comprising the following steps:

[0005] A. First, after the construction of the deep foundation pit retaining structure is completed, a drainage well is excavated at the bottom of the foundation pit;

[0006] B. Dig multiple drainage trenches at the upper mouth of the precipitation well;

[0007] C. Then reinforce and protect the upper port of the precipitation well;

[0008] D. Install longitudinal columns on the inner wall of the precipitation well and install a water level sensor group on the outer wall of the columns;

[0009] E. Install a water pump at the bottom of the precipitation well and connect the water outlet of the water pump to the drainage pipe. The drainage pipe is extended to the outside of the deep foundation pit for drainage to ensure that the bottom of the deep foundation pit is in a water-free environment.

[0010] Preferably, the present application provides a dewatering construction method suitable for a high-pressure deep foundation pit, wherein in step B, 4 to 6 drainage trenches are provided, and the drainage trenches are excavated obliquely around the drainage trenches.

[0011] Preferably, the present application provides a dewatering construction method suitable for a high-pressure deep foundation pit, wherein the upper port of the dewatering well in step C is reinforced with an annular steel plate mechanism, and the annular steel plate mechanism includes a first semicircular steel plate, a second semicircular steel plate, a fixed plate, a first hydraulic cylinder group and a second hydraulic cylinder group, and both ends of the fixed plate are respectively inserted into the inner wall of the dewatering well, the first semicircular steel plate and the second semicircular steel plate are fixed to the upper port of the dewatering well, the first hydraulic cylinder group is installed between the first semicircular steel plate and the fixed plate, and the second hydraulic cylinder group is installed between the second semicircular steel plate and the fixed plate.

[0012] Preferably, the present application provides a dewatering construction method suitable for high-pressure deep foundation pits, wherein the water level sensor group in step D includes a low water level sensor, a warning water level sensor and a high water level sensor, and the low water level sensor, the warning water level sensor and the high water level sensor all use Hall sensors.

[0013] Preferably, the present application provides a dewatering construction method suitable for a high-pressure deep foundation pit, which also includes a control box, which is installed outside the deep foundation pit, and a controller is installed in the control box. An alarm is installed on the top outside the control box, and the controller includes a central processing unit, a sensor signal acquisition unit, a water pump drive unit and an alarm unit. The input end of the sensor signal acquisition unit is respectively connected to a low water level sensor, a warning water level sensor and a high water level sensor, and the output end of the sensor signal acquisition unit is connected to the central processing unit. The central processing unit is connected to a water pump through a water pump drive unit, and the alarm unit is respectively connected to the central processing unit and the alarm, wherein the sensor signal acquisition unit is used to collect water level signals of a water level sensor group in a dewatering well; the water pump drive unit is used to drive the water pump to work, and the alarm unit is used to send an alarm signal when the water level in the dewatering well is too high.

[0014] Preferably, the present application provides a dewatering construction method suitable for a high-pressure deep foundation pit, wherein the width of the drainage groove is 20cm-30cm and the depth is 15cm-20cm.

[0015] Preferably, the present application provides a dewatering construction method suitable for a high-pressure deep foundation pit, wherein the diameter of the dewatering well is 80cm-110cm and the depth is 180cm-220cm.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The construction method adopted by the present invention is simple to construct, can quickly drain the accumulated water, can ensure that the base is in a water-free environment, and improves construction safety and efficiency.

[0018] (2) In the present invention, the upper port of the precipitation well is reinforced with an annular steel plate structure, which can prevent the precipitation well from collapsing, further improve the water collection and drainage effects of the precipitation well, and thus ensure the safety of the deep foundation pit.

[0019] (3) The present invention can also achieve high-efficiency early warning of the water level in the precipitation well. When the water volume in the precipitation well reaches the early warning water level, an alarm signal is issued to prompt the staff to observe closely. When the high water level is reached, the control chip automatically controls the water pump to pump water to lower the water level in the precipitation well. When the water drops to the low water level, the water pump stops working, thereby improving safety and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the construction flow chart of the present invention;

[0021] Figure 2 A top view of the precipitation well of the present invention;

[0022] Figure 3 This is a front view of the precipitation well of the present invention;

[0023] Figure 4 This is a control principle block diagram of the present invention;

[0024] In the figure: a precipitation well 1, a drainage ditch 2, a longitudinal column 3, a water pump 4, a drainage pipe 5, a first semicircular steel plate 6, a second semicircular steel plate 7, a fixed plate 8, a first hydraulic cylinder group 9, a second hydraulic cylinder group 10, a low water level sensor 11, a warning water level sensor 12, a high water level sensor 13, a control box 14, an alarm 15, a central processing unit 16, a sensor signal acquisition unit 17, a water pump drive unit 18, an alarm unit 19, and a water pump 20. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0029] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this application without affecting the effects that can be produced by this application and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of this application. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of this application without substantial change in the technical content.

[0030] See also Figure 1-4 The present invention provides a technical solution: a dewatering construction method suitable for a high-pressure deep foundation pit, the construction method comprising the following steps:

[0031] A. First, after the construction of the deep foundation pit retaining structure is completed, a dewatering well 1 is excavated at the bottom of the foundation pit;

[0032] B. Digging a plurality of drainage trenches 2 at the upper opening of the precipitation well 1;

[0033] C. Then, the upper port of the precipitation well 1 is reinforced and protected;

[0034] D. Install a longitudinal column 3 on the inner wall of the precipitation well 1, and install a water level sensor group on the outer wall of the column 3;

[0035] E. Install a water pump 4 at the bottom of the precipitation well 1, and connect the water outlet of the water pump 4 to the drainage pipe 5. The drainage pipe 5 extends to the outside of the deep foundation pit for drainage to ensure that the bottom of the deep foundation pit is in a water-free environment.

[0036] In the present invention, 4-6 drainage grooves 2 are arranged in step B, and the drainage grooves 2 are excavated obliquely around the precipitation well; the width of the drainage grooves 2 is 20cm-30cm, and the depth is 15cm-20cm; the diameter of the precipitation well 1 is 80cm-110cm, and the depth is 180cm-220cm.

[0037] In the present invention, the upper port of the precipitation well 1 in step C is reinforced with an annular steel plate mechanism, and the annular steel plate mechanism includes a first semicircular steel plate 6, a second semicircular steel plate 7, a fixed plate 8, a first hydraulic cylinder group 9 and a second hydraulic cylinder group 10. The two ends of the fixed plate 8 are respectively inserted into the inner wall of the precipitation well 1. The first semicircular steel plate 6 and the second semicircular steel plate 7 are fixed to the upper port of the precipitation well 1. The first hydraulic cylinder group 9 is installed between the first semicircular steel plate 6 and the fixed plate 8, and the second hydraulic cylinder group 10 is installed between the second semicircular steel plate 7 and the fixed plate 8. In the present invention, the upper port of the precipitation well is reinforced with an annular steel plate mechanism, which can prevent the precipitation well from collapsing, further improve the water collection and drainage effects of the precipitation well, and thus ensure the safety of the deep foundation pit.

[0038] In addition, in the present invention, the water level sensor group in step D includes a low water level sensor 11, a warning water level sensor 12 and a high water level sensor 13, and the low water level sensor 11, the warning water level sensor 12 and the high water level sensor 13 are all Hall sensors.

[0039] It also includes a control box 14, which is installed outside the deep foundation pit. A controller is installed in the control box 14, and an alarm 15 is installed on the top outside the control box 14. The controller 15 includes a central processing unit 16, a sensor signal acquisition unit 17, a water pump drive unit 18 and an alarm unit 19. The input end of the sensor signal acquisition unit 17 is respectively connected to the low water level sensor 11, the early warning water level sensor 12 and the high water level sensor 13, and the output end of the sensor signal acquisition unit 17 is connected to the central processing unit 16. The central processing unit 16 is connected to the water pump 20 through the water pump drive unit 18. The alarm unit 19 is respectively connected to the central processing unit 16 and the alarm 15, wherein the sensor signal acquisition unit is used to collect water level signals of the water level sensor group in the precipitation well; the water pump drive unit is used to drive the water pump to work, and the alarm unit is used to send an alarm signal when the water level in the precipitation well is too high. The present invention can also achieve high-efficiency early warning of the water level in the precipitation well. When the water volume in the precipitation well reaches the early warning water level, an alarm signal is issued to prompt the staff to observe closely. When the high water level is reached, the control chip automatically controls the water pump to pump water to lower the water level in the precipitation well. When the water drops to the low water level, the water pump stops working, thereby improving safety and reducing the labor intensity of workers.

[0040] In summary, the construction method adopted by the present invention is simple to construct, can quickly drain the accumulated water, can ensure that the base is in a water-free environment, and improves construction safety and construction efficiency.

[0041] The circuits, electronic components and modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0042] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A dewatering construction method suitable for high-pressure deep foundation pits, characterized in that: The construction method includes the following steps: A. First, after the construction of the deep foundation pit retaining structure is completed, a drainage well is excavated at the bottom of the foundation pit (1); B. excavating a plurality of drainage trenches (2) at the upper opening of the precipitation well (1); C. Then, the upper port of the precipitation well (1) is reinforced and protected; D. Installing a longitudinal column (3) on the inner wall of the precipitation well (1), and installing a water level sensor group on the outer wall of the column (3); E. Install a water pump (4) at the bottom of the drainage well (1), and connect the water outlet of the water pump (4) to a drainage pipe (5). The drainage pipe (5) extends to the outside of the deep foundation pit for drainage, thereby ensuring that the bottom of the deep foundation pit is in a water-free environment.

2. A dewatering construction method suitable for a high-pressure deep foundation pit according to claim 1, characterized in that: In step B, 4 to 6 drainage grooves 2 are provided, and the drainage grooves (2) are excavated obliquely around the precipitation well.

3. A dewatering construction method suitable for a high-pressure deep foundation pit according to claim 1, characterized in that: In step C, the upper port of the precipitation well (1) is reinforced by an annular steel plate mechanism, wherein the annular steel plate mechanism comprises a first semicircular steel plate (6), a second semicircular steel plate (7), a fixed plate (8), a first hydraulic cylinder group (9) and a second hydraulic cylinder group (10), wherein both ends of the fixed plate (8) are respectively inserted into the inner wall of the precipitation well (1), the first semicircular steel plate (6) and the second semicircular steel plate (7) are fixed to the upper port of the precipitation well (1), the first hydraulic cylinder group (9) is installed between the first semicircular steel plate (6) and the fixed plate (8), and the second hydraulic cylinder group (10) is installed between the second semicircular steel plate (7) and the fixed plate (8).

4. A dewatering construction method suitable for a high-pressure deep foundation pit according to claim 1, characterized in that: The water level sensor group in step D comprises a low water level sensor (11), an early warning water level sensor (12) and a high water level sensor (13), and the low water level sensor (11), the early warning water level sensor (12) and the high water level sensor (13) are all Hall sensors.

5. The dewatering construction method applicable to a high-pressure deep foundation pit according to claim 1, characterized in that: The invention also comprises a control box (14), wherein the control box (14) is installed outside the deep foundation pit, a controller is installed inside the control box (14), an alarm (15) is installed on the top of the control box (14), the controller (15) comprises a central processing unit (16), a sensor signal acquisition unit (17), a water pump drive unit (18) and an alarm unit (19), and the input end of the sensor signal acquisition unit (17) is respectively connected to a low water level sensor (11), a warning water level sensor (12) and a high water level sensor ( 13), the output end of the sensor signal acquisition unit (17) is connected to the central processing unit (16), the central processing unit (16) is connected to the water pump (20) through the water pump drive unit (18), and the alarm unit (19) is respectively connected to the central processing unit (16) and the alarm (15), wherein the sensor signal acquisition unit is used to collect the water level signal of the water level sensor group in the precipitation well; the water pump drive unit is used to drive the water pump to work, and the alarm unit is used to send an alarm signal when the water level in the precipitation well is too high.

6. The dewatering construction method applicable to a high-pressure deep foundation pit according to claim 1, characterized in that: The width of the drainage groove (2) is 20cm-30cm, and the depth is 15cm-20cm.

7. The dewatering construction method applicable to a high-pressure deep foundation pit according to claim 1, characterized in that: The diameter of the precipitation well (1) is 80cm-110cm, and the depth is 180cm-220cm.

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