Micro confined water measurement auxiliary device for engineering investigation

Abstract

The utility model discloses a micro confined water measurement auxiliary device for engineering investigation. The micro confined water measurement auxiliary device comprises a water stop pipe, a water filter pipe and a conical head, the water stopping pipe is connected to the top end of the water filtering pipe and detachably connected to the drill rod. The conical head is connected to the bottom end of the water filtering pipe, and water filtering holes are formed in the water filtering pipe; the diameter of the conical head is larger than that of the water filtering pipe. Compared with the prior art, before civil engineering investigation, depth information of a geologic layer needing to be measured is accurately mastered, drilling is stopped when a drilling hole is drilled to the lower portion of a relative water-resisting layer and 50 cm away from a top plate of a permeable layer (micro confined water), the machined auxiliary measuring device is driven into a measuring layer, and after the water level to be measured enters a water filtering pipe, rises to a certain height and is stabilized, the water level to be measured is detected. The water depth is measured in the pipe through the water depth measuring instrument, the obtained measured water level depth is more representative, and data are more accurate and reliable.

Description

Technical Field

[0001] This utility model relates to the field of workshop turnover tools technology, and in particular to a micro-pressurized water measurement auxiliary device for engineering survey. Background Technology

[0002] With the continuous advancement of urbanization, high-rise buildings and the utilization of underground space have gradually become important directions for solving urban development problems. High-rise buildings can make more effective use of vertical space, while the development and utilization of underground space can further expand the functions and capacity of cities. Groundwater has a significant impact on the development and utilization of underground space; therefore, accurate groundwater measurement is crucial. In plain areas, groundwater mainly consists of unconfined aquifers, slightly confined aquifers, and confined aquifers. Unconfined aquifers are shallower, and measurement methods are simple and technically mature. Confined aquifers are deeper and mainly affect extra-large foundation pit projects. For foundation pit projects with a high concentration of general and medium depths in modern cities, the main impact is on slightly confined aquifers, where the aquifer is mainly at a certain depth below the foundation pit, easily causing quicksand, erosion, piping, basement floor slab uplift, foundation instability, and uneven settlement.

[0003] Currently, in engineering surveys, especially in civil engineering construction, the measurement methods for micro-confined water mainly rely on pumping tests or local experience estimations. These methods have the following drawbacks: 1) They are not synchronized with engineering surveys, and the pressure head of micro-confined water is affected by the borehole, resulting in a reduction in pressure head and unreliable accuracy of the measured water depth data; 2) Pumping tests are costly and have a long working cycle; 3) Local experience estimations make it difficult to guarantee the accuracy of the data.

[0004] Therefore, the accuracy of water level measurement is poor and the cost is high, and there is still much room for improvement in the water level measurement process. Utility Model Content

[0005] The purpose of this utility model is to provide an auxiliary device for measuring micro-pressurized water in engineering surveys. Before civil engineering surveys, it is necessary to accurately determine the depth information of the geological layer to be measured. Drilling is stopped when the borehole reaches the lower part of the relatively impermeable layer and 50cm from the top plate of the permeable layer (micro-pressurized water). The processed measuring auxiliary device is then driven into the measuring layer. After the water level rises to a certain height and stabilizes in the filter pipe, the water depth is measured in the pipe using a depth measuring instrument. The obtained water level depth is more representative and the data is more accurate and reliable, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An auxiliary device for measuring micro-pressurized water in engineering surveys includes a water-stop pipe, a water-filter pipe, and a cone. The water-stop pipe is connected to the top of the water-filter pipe and is detachably connected to the drill rod. The cone is connected to the bottom of the water-filter pipe, and the water-filter pipe has a filter hole. The diameter of the cone is larger than the diameter of the water-filter pipe, and the diameter of the water-stop pipe is larger than the diameter of the cone.

[0008] Preferably, the top diameter of the waterstop pipe is small and the same as the diameter of the connecting drill rod, and the outer wall is provided with external threads. The top end of the waterstop pipe is connected to the drill rod through a joint, and the bottom end of the waterstop pipe is provided with internal threads.

[0009] Preferably, the filter pipe has external threads at both ends, and the filter pipe is connected to the water stop pipe by threads. The filter holes are arranged in multiple sets symmetrically at the top and bottom, and the upper and lower sets of filter holes are vertically symmetrically distributed.

[0010] Preferably, the filter holes are 45° inclined holes that slope inward and downward.

[0011] Preferably, the cone is a solid structure, with an internal thread at the top, and the cone is threaded to the water filter pipe.

[0012] Preferably, the cone tip angle is 60°.

[0013] Preferably, the water-stop pipe, the water filter pipe, and the cone are all made of steel.

[0014] The beneficial effects of this utility model are:

[0015] This utility model provides an auxiliary device for measuring micro-pressurized water in engineering surveys. Before conducting civil engineering surveys, it accurately determines the depth information of the geological layers to be measured. Drilling is stopped when the borehole reaches the lower part of the relatively impermeable layer and is 50cm away from the top plate of the permeable layer (micro-pressurized water). The prepared measuring auxiliary device is then driven into the measuring layer. After the water level rises to a certain height and stabilizes in the filter pipe, the water depth is measured inside the pipe using a depth measuring instrument. The obtained water level depth is more representative, and the data is more accurate and reliable.

[0016] This utility model provides an auxiliary device for measuring micro-pressurized water in engineering surveys. It is simple to operate, has a short working time, and can be used during spare time before and after work. The device is also reusable, saving a lot of economic and time costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the waterstop pipe structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the water filter pipe structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the cone-shaped structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the present invention in its working state.

[0022] In the diagram: 1-water stop pipe, 2-water filter pipe, 201-water filter hole, 3-cone head. Detailed Implementation

[0023] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: As Figures 1-4 As shown, an auxiliary device for measuring micro-pressurized water in engineering surveys includes a water-stopping pipe 1, a water-filtering pipe 2, and a cone head 3; the water-stopping pipe 1 is connected to the top end of the water-filtering pipe 2, and the water-stopping pipe 1 is detachably connected to the drill rod; the cone head 3 is connected to the bottom end of the water-filtering pipe 2, and the water-filtering pipe 2 has a water-filtering hole 201; the diameter of the cone head 3 is larger than the diameter of the water-filtering pipe 2, and the diameter of the water-stopping pipe 1 is larger than the diameter of the cone head 3.

[0025] The main body of the waterstop pipe 1 is made of steel with an outer diameter of 60mm, an inner diameter of 30mm, and a length of 50cm. The upper part narrows to an outer diameter of 42mm and an inner diameter of 30mm, and is connected to the upper drill rod (outer diameter of 42mm and inner diameter of 30mm) via a locking handle. In this embodiment, the locking handle is sleeve-shaped, and the inner wall of the locking handle is provided with internal threads. The drill rod and the waterstop pipe 1 are provided with external threads, so that they are connected through the locking handle. The lower part of the waterstop pipe 1 narrows to an outer diameter of 57mm and an inner diameter of 30mm, and is provided with internal threads, and is connected to the lower filter pipe 2 via threads.

[0026] The main body of the filter pipe 2 is made of steel with an outer diameter of Φ42mm and an inner diameter of Φ30mm. It has external threads at both ends and is connected to the upper and lower water stop pipes 1 and the cone head 3. The pipe body has symmetrical filter holes 201 that are inclined inward and downward at 45°. Only one set of filter holes 201 is opened at each position of the pipe body. The upper and lower sets of filter holes 201 are vertically symmetrical, which enhances the effective integrity of the pipe body and ensures its strength.

[0027] The cone 3 has a solid steel body with an outer diameter of Φ42mm. The cone tip is 60° and the upper opening narrows to an outer diameter of Φ42mm. It has an internal thread and is connected to the water filter pipe 2 via the thread.

[0028] The scope of application of this utility model is: applicable to the surveying of civil engineering projects, for measuring the density of loose to medium-dense aquifers with slightly confined water.

[0029] The specific working principle of this utility model is as follows:

[0030] like Figure 5As shown, before the test, a static probe hole is drilled within 1m of the hole location to be tested using a static probe device. The hole depth penetrates the micro-confined aquifer. The static probe rod is left in the hole and is lifted after the water level measurement is completed (this ensures that the pressure of the micro-confined water head is not reduced, thus guaranteeing the accuracy of the measurement). Using the static probe layer data, a drilling rig is used to drill to the lower part of the relative impermeable layer and 50cm from the top plate of the permeable layer (micro-confined aquifer) at the hole location to be tested using a 108mm core tube. Then, the micro-confined aquifer measurement auxiliary device prepared in this invention is connected to the drill rod (the length is determined according to the hole depth) and the standard penetration hammer. The micro-confined aquifer measurement auxiliary device is driven into the predetermined depth by the hammer. The correct depth is when the upper water stop pipe 1 (50cm) of the micro-confined aquifer measurement device completely overlaps with the reserved thickness (50cm) of the relative impermeable layer.

[0031] During the insertion process of the micro-pressurized water measuring device, the diameter of the cone 3 is slightly larger than the diameter of the filter pipe 2, which plays a role in expanding the hole. Its main function is to prevent the filter holes 201 on the filter pipe 2 from being blocked. The filter holes 201 in the filter pipe 2 are set as inward and downward inclined holes at 45°. Their main function is to ensure that even if soil enters when penetrating the soil layer, it is only a small and thin layer. Under the action of water pressure, the filter holes 201 will not be blocked. The diameter of the waterstop pipe 1 is slightly larger than the diameter of the cone 3, so that the waterstop pipe 1 squeezes the reserved relative water-resistant soil layer again. At the same time, under the action of the adhesion force of the relative water-resistant layer, the waterstop pipe 1 and the relative water-resistant soil layer are fully bonded, making the relative water-resistant layer safer and more stable, and the micro-pressurized water head pressure is not reduced.

[0032] After the installation of the micro-pressurized water measurement auxiliary device is completed (preferably before the project starts, before leaving get off work in the evening, mainly for the following reasons: 1. The pressure of the micro-pressurized water head is not affected by other boreholes; 2. It will not delay the construction cycle), allow sufficient time for the micro-pressurized water to enter the filter pipe 2. After the micro-pressurized water has fully stabilized in the filter pipe 2, use a depth measuring instrument to enter the drill rod and measure the water level up to the top of the drill rod that is exposed above the ground. Subtract the length of the drill rod that is exposed above the ground to get the actual measured depth of the micro-pressurized water.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for measuring auxiliary pressure water for engineering survey, characterized in that: Including water stop pipe (1), filter pipe (2) and cone head (3), water stop pipe (1) is connected to the top end of filter pipe (2), and water stop pipe (1) is detachably connected to drill pipe, cone head (3) is connected to the bottom end of filter pipe (2), and filter pipe (2) is provided with filter hole (201), the diameter of cone head (3) is greater than the diameter of filter pipe (2), and the diameter of water stop pipe (1) is greater than the diameter of cone head (3).

2. The auxiliary device for measuring slightly pressurized water in engineering surveying according to claim 1, characterized in that: The top diameter of water stop pipe (1) is small, the same as the diameter of drill pipe, and the outer wall is provided with external thread, the top end of water stop pipe (1) is connected with drill pipe through locking hand, and the bottom end of water stop pipe (1) is provided with internal thread.

3. The auxiliary device for measuring slightly pressurized water in engineering surveying according to claim 2, characterized in that: Filter pipe (2) is provided with external thread at both ends, filter pipe (2) is connected with water stop pipe (1) through thread, filter hole (201) is a plurality of groups of up-down symmetrical arrangement, and the upper and lower filter holes (201) are vertically symmetrical.

4. The auxiliary device for measuring slightly pressurized water in engineering investigation according to claim 1 or 3, characterized in that: Filter hole (201) is a 45° inclined hole inclined inward and downward.

5. The auxiliary device for measuring slightly pressurized water in engineering surveying according to claim 3, characterized in that: Cone head (3) is a solid body structure, the top end of cone head (3) is provided with internal thread, and cone head (3) is connected with filter pipe (2) through thread.

6. The auxiliary device for measuring slightly pressurized water in engineering surveying according to claim 1 or 5, characterized in that: The angle of the tip of cone head (3) is 60°.

7. The auxiliary device for measuring slightly pressurized water in engineering surveying according to claim 1, characterized in that: Water stop pipe (1), filter pipe (2) and cone head (3) are all made of steel.

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