Attached precipitation observation well and construction method thereof

Abstract

The invention provides an attached precipitation observation well and a construction method thereof. The attached precipitation observation well comprises a hydraulic pushing type water level communication device, a hydraulic pressurizing device and a water level measuring instrument, wherein the hydraulic pressurizing device and the water level measuring instrument are used in cooperation with the hydraulic pushing type water level communication device. By providing the attached precipitation observation well attached to the interior of the underground diaphragm wall, the layout of the attached precipitation observation well is completed while the construction of the underground diaphragm wall is completed, so that the precipitation well does not need to be independently constructed in the precipitation operation process of the deep foundation pit, the construction cost is effectively saved, and the construction efficiency is improved. Meanwhile, the water level change of the weakest part in the foundation pit and the water level change outside the foundation pit can be observed, the number of wells in the foundation pit is effectively reduced during construction of the narrow foundation pit, equipment running is facilitated, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an attached precipitation observation well and a construction method thereof. Background Art

[0002] At present, dewatering construction is a common process in deep foundation pit projects. By extracting groundwater to lower the water level of the confined water, sudden surges during the foundation pit excavation process are prevented to ensure the safety of the foundation pit. In this process, it is necessary to set up supporting observation wells to ensure that the execution of dewatering operations meets the needs. It is necessary not only to observe whether the water level in the pit has been lowered to a safe position, but also to understand whether the lowering of the water level outside the pit affects the surrounding environment. Especially when the foundation pit is small and the surrounding environment is complex, the number of observation wells may be several times that of dewatering wells. The conventional practice is generally to construct an observation well at the observation location. The process is similar to that of the dewatering well, including drilling and installing well pipes. Observation wells are generally not responsible for pumping water, but are only used to observe the water level of the confined water, but their cost is close to that of the dewatering well. Too many observation wells ultimately lead to a significant increase in the cost of the entire dewatering process.

[0003] In addition, for the observation of the confined water level, due to the characteristics of groundwater seepage and water level drop after precipitation, the water level is often the highest near the edge of the foundation pit, which is a relatively weak point. However, due to space limitations and the influence of other structures in the foundation pit, it is often difficult to arrange observation wells near the edge of the foundation pit, and it is difficult to accurately meet the requirements for water level observation. At the same time, in small foundation pits such as shield working pits, the original site is small, and the addition of observation wells makes it more difficult for excavation equipment to travel, affecting construction efficiency and increasing the risk of damage to precipitation wells or observation wells.

[0004] Another important observation is the impact of decompression and dewatering in the foundation pit on the outside of the foundation pit. The conventional method is to set up a special pressure water level observation well outside the foundation pit. Its structure and construction method are similar to the dewatering well in the pit, which also increases the cost. Moreover, for projects with large site conditions, there may be no conditions for setting up observation wells outside the pit, resulting in the lack of water level observation outside the pit.

[0005] To summarize, at present, during the precipitation process, it is necessary to independently construct observation wells inside and outside the pit, which generates additional costs. At the same time, it is generally difficult to arrange observation wells at the weakest parts, and it affects the travel of equipment in the narrow foundation pit. Some observations cannot even be implemented due to site conditions. Existing technical achievements have failed to effectively solve this problem. Technical personnel in this field have been looking for solutions to meet this demand. Summary of the invention

[0006] The purpose of the present invention is to provide an attached precipitation observation well and a construction method thereof, which has low cost and can avoid affecting the excavation of narrow foundation pits. The attached precipitation well can be arranged outside the pit and in weak parts of the foundation pit (edge ​​of the foundation pit) without being restricted by the site.

[0007] In order to solve the above technical problems, the present invention provides an attached precipitation observation well, which is pre-installed at a predetermined position in an underground continuous wall. The attached precipitation observation well comprises: a hydraulic top-pushing water level communication device and a hydraulic pressure device and a water level measuring instrument used in conjunction with the device; wherein:

[0008] The hydraulic push-type water level communication device comprises: a sleeve, an end sealing plate sealing the sleeve, a communication pipe communicating with the sleeve at a side away from the end sealing plate, and a push rod, a filter layer and a hydraulic jack arranged in the sleeve, the filter layer is sleeved outside the push rod and fills the sleeve space between the end sealing plate and the communication port of the communication pipe, the first end of the push rod is vertically connected to the end sealing plate, and the second end is in contact with the top of the hydraulic jack;

[0009] The hydraulic pressurizing device includes: an oil pipe and a pressurizing unit. The pressurizing unit pressurizes the hydraulic jack based on the oil pipe. When the hydraulic jack is working, its pushing force is transmitted to the end sealing plate through the push rod. The end sealing plate pushes through the plain concrete layer and soil on its surface, so that the pressurized water in the soil enters the sleeve, and can rise along the connecting pipe after being filtered by the filter layer. The water level of the pressurized water in the connecting pipe is measured by a water level measuring instrument.

[0010] Optionally, the attached precipitation observation well further includes: a flushing device used in conjunction with the hydraulic top-pushing water level connecting device to flush the hydraulic top-pushing water level connecting device to ensure that the inside of the hydraulic top-pushing water level connecting device is unobstructed during operation.

[0011] Optionally, in the attached precipitation observation well, the flushing device has at least water intake, air intake and drainage functions.

[0012] Optionally, in the attached precipitation observation well, the longitudinal section of the end sealing plate is T-shaped.

[0013] Optionally, in the attached precipitation observation well, the connecting pipe is a PVC pipe.

[0014] Optionally, in the attached precipitation observation well, the connection position between the connecting pipe and the sleeve is sealed with epoxy glue.

[0015] The present invention also provides a construction method of an attached precipitation observation well, the construction method of the attached precipitation observation well comprising:

[0016] S1. Installing the attached precipitation observation well: before lowering the underground continuous wall steel cage, bind the attached precipitation observation well to the underground continuous wall steel cage at a predetermined position, so that after the underground continuous wall steel cage is lowered, the end sealing plate of the attached precipitation observation well is adjacent to the confined water layer in the underground soil;

[0017] S2. Construction of underground continuous wall: lowering the underground continuous wall steel cage of the attached precipitation observation well into the trough section, extending the connecting pipe and oil pipe of the attached precipitation observation well to the ground, pouring concrete into the underground continuous wall steel cage to form an underground continuous wall;

[0018] S3. Operate the hydraulic push-type water level connecting device: use the pressurizing unit to pressurize the hydraulic jack through the oil pipe, and the push force of the hydraulic jack is transmitted to the end sealing plate through the push rod. The end sealing plate pushes and penetrates the plain concrete layer and underground soil on its surface, so that the pressurized water in the pressurized water layer in the underground soil enters the sleeve and can rise along the connecting pipe after being filtered by the filter layer;

[0019] S4. Observe the water level of the pressurized water: obtain the water level of the pressurized water in the connecting pipe by measuring with a water level measuring instrument.

[0020] Optionally, in the construction method of the attached precipitation observation well, between executing S2 and S3, the following steps are further included:

[0021] Flushing the hydraulic top-push type water level connecting device: using the flushing device to flush the hydraulic top-push type water level connecting device through the port of the connecting pipe on the ground, so as to ensure that the inside of the hydraulic top-push type water level connecting device is unobstructed when working.

[0022] In the attached precipitation observation well and its construction method provided by the present invention, the attached precipitation observation well includes: a hydraulic top-pushing water level connecting device and a hydraulic pressure device and a water level measuring instrument used in conjunction with it. By providing an attached precipitation observation well attached to the inside of the underground continuous wall, the layout of the attached precipitation observation well is completed at the same time as the construction of the underground continuous wall is completed. Therefore, there is no need to independently construct precipitation wells during the deep foundation pit precipitation operation, which effectively saves construction costs. At the same time, the water level changes at the weakest part of the foundation pit and outside the pit can be observed. When constructing a narrow foundation pit, the number of wells in the pit is also effectively reduced, which is convenient for equipment travel and improves construction efficiency.

[0023] On the other hand, the flushing device flushes the hydraulic push-type water level connecting device through the port of the connecting pipe on the ground to ensure the internal smoothness of the hydraulic push-type water level connecting device during operation, avoid internal blockage of the hydraulic push-type water level connecting device, and ensure the measurement environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0025] Figure 1 It is a flow chart of a construction method of an attached precipitation observation well according to an embodiment of the present invention.

[0026] Figure 2 It is a schematic diagram of an attached precipitation observation well installed on an underground continuous wall steel cage in one embodiment of the present invention;

[0027] Figure 3 is a cross-sectional schematic diagram of an attached precipitation observation well after S2 is executed in one embodiment of the present invention;

[0028] Figure 4 yes Figure 3 An enlarged schematic diagram of the hydraulic push-type water level communication device (initial state);

[0029] Figure 5 is a cross-sectional schematic diagram of an attached precipitation observation well after S3 is executed in one embodiment of the present invention;

[0030] Figure 6 yes Figure 5 An enlarged schematic diagram of the hydraulic push-type water level connecting device (working state).

[0031] In the figure:

[0032] 1-Hydraulic push-type water level connecting device; 2-Oil pipe; 3-Pressure unit; 4-Water level measuring instrument; 5-Push rod; 6-Sleeve; 7-Filter layer; 8-Connecting pipe; 9-Epoxy glue; 10-Hydraulic jack; 11-End sealing plate DETAILED DESCRIPTION

[0033] The attached precipitation observation well and its construction method proposed by the present invention are further described in detail below in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0035] In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, 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 invention 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 cannot be understood as a limitation on the invention.

[0036] 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 the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0038] Please refer to Figure 1 The attached precipitation observation well includes: a hydraulic push-type water level communication device 1 and a hydraulic pressure device and a water level measuring instrument 4 used in conjunction with it; wherein,

[0039] The hydraulic push-type water level communication device 1 comprises: a sleeve 6, an end sealing plate 11 sealing the sleeve 6, a communication pipe 8 communicating with the sleeve 6 at a side away from the end sealing plate 11, and a push rod 5, a filter layer 7 and a hydraulic jack 10 arranged in the sleeve 6, the filter layer 7 is sleeved outside the push rod 5 and fills the sleeve space between the end sealing plate 11 and the communication port of the communication pipe 8, the first end of the push rod 5 is vertically connected to the end sealing plate 11, and the second end is in contact with the top of the hydraulic jack 10;

[0040] The hydraulic pressurizing device includes: an oil pipe 2 and a pressurizing unit 3. The pressurizing unit 3 pressurizes the hydraulic jack 10 based on the oil pipe 2. When the hydraulic jack 10 is working, its pushing force is transmitted to the end sealing plate 11 through the push rod. The end sealing plate 11 pushes and penetrates the plain concrete layer and soil on its surface, so that the pressurized water in the soil enters the sleeve 6, and can rise along the connecting pipe 8 after being filtered by the filter layer 7. The water level of the pressurized water in the connecting pipe 8 is measured based on the water level measuring instrument 4.

[0041] When the attached precipitation observation well of the present invention is actually used, it is an attached precipitation observation well attached to the inside of the underground continuous wall. The layout of the attached precipitation observation well is completed when the construction of the underground continuous wall is completed. Therefore, there is no need to independently construct precipitation wells during the deep foundation pit dewatering operation, which effectively saves construction costs. At the same time, the weakest part of the foundation pit and the water level changes outside the pit can be observed. When constructing a narrow foundation pit, the number of wells in the pit is also effectively reduced, which facilitates equipment travel and improves construction efficiency.

[0042] Preferably, the attached precipitation observation well of the present invention also includes: a flushing device used in conjunction with the hydraulic top-pushing water level connecting device, which flushes the hydraulic top-pushing water level connecting device to ensure that the inside of the hydraulic top-pushing water level connecting device is unobstructed during operation. Specifically, the flushing device has at least water intake, air intake, and drainage functions, and pressurizes water and air injection into the inside of the hydraulic top-pushing water level connecting device (specifically, the inside of the sleeve 6) through the port of the connecting pipe on the ground to achieve a similar well-washing effect, remove silt and impurities inside the hydraulic top-pushing water level connecting device, and restore its normal use.

[0043] like Figure 4 and Figure 6 As shown, the longitudinal section of the end sealing plate 11 in this embodiment is T-shaped.

[0044] Preferably, the connecting position between the connecting pipe 8 and the sleeve 6 is sealed by epoxy glue 9, and the connecting pipe 8 is a PVC pipe.

[0045] Correspondingly, this embodiment also provides a construction method for an attached precipitation observation well. Figures 1 to 6 The construction method of the attached precipitation observation well described in this embodiment is described in detail.

[0046] First, please refer to Figure 2 , execute step S1, install the attached precipitation observation well: before the underground continuous wall steel cage is lowered, bind the attached precipitation observation well to the underground continuous wall steel cage at the predetermined position, so that after the underground continuous wall steel cage is lowered, the end sealing plate 11 of the attached precipitation observation well is adjacent to the confined water layer in the underground soil; the factors to be considered in the predicted position here are: the position of the confined water layer in the actual underground soil, the position of the confined water layer corresponding to the confined water layer when the underground continuous wall steel cage is lowered, the thickness that the end sealing plate 11 can penetrate, etc. The ultimate goal is that in the subsequent operation of the hydraulic jacking water level connecting device, the end sealing plate 11 can push and penetrate the plain concrete layer and underground soil on its surface, so that the confined water in the confined water layer in the underground soil enters the sleeve 6.

[0047] Next, please refer to Figure 3 and Figure 4 , execute step S2, construct the underground continuous wall: lower the underground continuous wall steel cage where the attached precipitation observation well is installed into the slot section, extend the connecting pipe 8 and the oil pipe of the attached precipitation observation well to the ground, and pour concrete into the underground continuous wall steel cage to form an underground continuous wall.

[0048] Specifically, during the pouring of concrete for the underground continuous wall steel cage, the hydraulic jacking type water level connecting device is wrapped inside the underground continuous wall concrete. When the concrete has a certain strength, S3 is carried out.

[0049] Next, please refer to Figure 5 and Figure 6 , execute step S3, operate the hydraulic jacking water level connecting device: use the pressurizing unit 3 to pressurize the hydraulic jack 10 through the oil pipe 2, the jacking force of the hydraulic jack 10 is transmitted to the end sealing plate 11 through the push rod, and the end sealing plate 11 pushes and penetrates the plain concrete layer and underground soil on its surface, so that the pressurized water in the pressurized water layer in the underground soil enters the sleeve 6, and can rise along the connecting pipe 8 after being filtered by the filter layer 7.

[0050] Next, please refer to Figure 5 , execute step S4, observe the water level of the pressurized water: obtain the water level of the pressurized water in the connecting pipe 8 based on the water level measuring instrument 4 to determine the execution status of the dewatering operation inside and outside the foundation pit.

[0051] Furthermore, between executing S2 and S3, the following steps are also included:

[0052] Flushing the hydraulic top-pushing water level connecting device: using the flushing device to flush the hydraulic top-pushing water level connecting device through the port of the connecting pipe 8 on the ground, so as to ensure that the inside of the hydraulic top-pushing water level connecting device is unobstructed when working.

[0053] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An attached precipitation observation well, which is pre-installed at a predetermined position in an underground continuous wall, characterized in that: include: A hydraulic push-type water level communication device (1) and a hydraulic pressure device and a water level measuring instrument (4) used in conjunction with the device; wherein: The hydraulic push-type water level communication device (1) comprises: a sleeve (6), an end sealing plate (11) sealing the sleeve (6), a communication pipe (8) communicating with the sleeve (6) at a side away from the end sealing plate (11), and a push rod (5), a filter layer (7) and a hydraulic jack (10) arranged in the sleeve (6); the filter layer (7) is sleeved outside the push rod (5) and fills the sleeve space between the end sealing plate (11) and the communication port of the communication pipe (8); the first end of the push rod (5) is vertically connected to the end sealing plate (11), and the second end is in contact with the top of the hydraulic jack (10); The hydraulic pressurizing device comprises: an oil pipe (2) and a pressurizing unit (3). The pressurizing unit (3) pressurizes the hydraulic jack (10) based on the oil pipe (2). When the hydraulic jack (10) is working, its pushing force is transmitted to the end sealing plate (11) through the push rod. The end sealing plate (11) pushes and penetrates the plain concrete layer and soil on its surface, so that the pressurized water in the soil enters the sleeve (6) and can rise along the connecting pipe (8) after being filtered by the filter layer (7). The water level of the pressurized water in the connecting pipe (8) is measured and obtained based on the water level measuring instrument (4).

2. The attached precipitation observation well according to claim 1, characterized in that: Also includes: The flushing device used in conjunction with the hydraulic top-push type water level connecting device flushes the hydraulic top-push type water level connecting device to ensure that the inside of the hydraulic top-push type water level connecting device is unobstructed when working.

3. The attached precipitation observation well according to claim 2, characterized in that: The flushing device at least has the functions of water intake, air intake and drainage.

4. The attached precipitation observation well according to any one of claims 1 to 3, characterized in that: The longitudinal section of the end sealing plate (11) is T-shaped.

5. The attached precipitation observation well according to any one of claims 1 to 3, characterized in that: The connecting pipe (8) is a PVC pipe.

6. The attached precipitation observation well according to any one of claims 1 to 3, characterized in that: The connection position between the connecting pipe (8) and the sleeve (6) is sealed by epoxy glue (9).

7. A construction method of an attached precipitation observation well as claimed in any one of claims 1 to 6, characterized in that: include: S1. Installing an attached precipitation observation well: before lowering the underground continuous wall steel cage, the attached precipitation observation well is bound to the underground continuous wall steel cage at a predetermined position, so that after the underground continuous wall steel cage is lowered, the end sealing plate (11) of the attached precipitation observation well is adjacent to the confined water layer in the underground soil; S2, constructing the underground continuous wall: lowering the underground continuous wall steel cage of the attached precipitation observation well into the trough section, extending the connecting pipe (8) and the oil pipe of the attached precipitation observation well to the ground, pouring concrete into the underground continuous wall steel cage to form the underground continuous wall; S3, operating the hydraulic push-type water level connecting device: using the pressurizing unit (3) to pressurize the hydraulic jack (10) through the oil pipe (2), the pushing force of the hydraulic jack (10) is transmitted to the end sealing plate (11) through the push rod, and the end sealing plate (11) pushes and penetrates the plain concrete layer and the underground soil on its surface, so that the pressurized water in the pressurized water layer in the underground soil enters the sleeve (6), and can rise along the connecting pipe (8) after being filtered by the filter layer (7); S4. Observe the water level of the pressurized water: measure and obtain the water level of the pressurized water in the connecting pipe (8) using the water level measuring instrument (4).

8. The construction method of the attached precipitation observation well according to claim 7, characterized in that: Between executing S2 and S3, the following steps are also included: Flushing the hydraulic top-pushing water level connecting device: using the flushing device to flush the hydraulic top-pushing water level connecting device through the port of the connecting pipe (8) on the ground, so as to ensure that the inside of the hydraulic top-pushing water level connecting device is unobstructed when working.

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