Pile foundation inclination measuring device for shield cutting underground pile foundation model test
Through the use of indirect measurement methods in the shield cutting underground pile foundation test, the traction line and thousand tables are used to obtain the tilt and displacement data of the pile body, which solves the tedious problems of direct measurement operations, and improves the continuity and measurement efficiency of the test.
Patent Information
- Application Number
- CN202421036972.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-14
AI Technical Summary
In the shield cutting underground pile foundation model test, it is difficult to obtain the pile body displacement value through direct measurement, resulting in cumbersome operation and affecting the test continuity.
Adopting indirect measurement methods, by setting multiple traction lines in the pile body, it leads it to the box and connects the thousands of meters to obtain the tilt and displacement data of the pile body through geometric operations.
The measurement operation is simplified, the measurement efficiency is improved, the continuity of the test process has been maintained, and the tilt and displacement of the pile foundation can be more comprehensively understood.
Smart Images
Figure CN222413170U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shield cutting underground pile foundation test, and more specifically to a pile foundation inclination measuring device used for shield cutting underground pile foundation model test. Background Art
[0002] The emergence of the shield cutting underground pile foundation test originated from the development and utilization of underground space in urban construction. With the acceleration of urbanization, the demand for construction of underground transportation, municipal facilities, etc. is growing. Shield technology has been widely used as an efficient and safe tunnel construction method. However, when the shield tunnel passes through the existing pile foundation, how to ensure that the shield machine cuts the pile foundation safely and effectively to avoid damage to the surrounding environment has become an urgent problem to be solved. Therefore, the shield cutting underground pile foundation test came into being. By simulating and studying the process of shield cutting pile foundation under different conditions, theoretical support and construction basis are provided for actual engineering. The shield cutting underground pile foundation test refers to the test process of cutting underground pile foundation by using a shield machine to simulate actual construction conditions. The test aims to study the mechanical behavior, cutting efficiency, tool wear and other issues of the shield machine in the process of cutting pile foundation, and to evaluate the impact of the cutting process on the surrounding environment.
[0003] In the model test of shield cutting underground pile foundation, it is necessary to grasp the displacement of the pile body during the shield model cutting of the pile foundation in order to analyze its inclination and force characteristics. In the actual test process, since the pile foundation is buried in the soil of the test box, it is difficult to obtain the displacement value of the pile body by direct measurement. If you want to enter the box for measurement during the cutting process, not only is the operation cumbersome, but the shield cutting needs to be suspended, which affects the continuity of the test process and causes unnecessary disturbance to the soil in addition to the shield. Summary of the invention
[0004] In order to solve the problem that direct measurement of pile body displacement value is cumbersome and affects the shield cutting underground pile foundation test, the utility model provides a pile foundation inclination measuring device for shield cutting underground pile foundation model test, which adopts indirect measurement method, and multiple traction lines are arranged on the pile body and led out of the box body, each traction line is connected to a micrometer, and the measurement values of any two micrometers are obtained. Then, through simple geometric calculation, the inclination data of the pile body between the two micrometers and the connection point of the pile body are obtained, and the displacement value of the pile body can be obtained after geometric calculation of the inclination data.
[0005] The technical solution of the utility model is as follows:
[0006] A pile foundation inclination measuring device for shield cutting underground pile foundation model test comprises several groups of dial gauges, each group comprises at least two dial gauges, each dial gauge is connected to the pile body surface of the underground pile foundation model through a traction line, and the connection point between each group of dial gauges and the pile body of the underground pile foundation model is located on a straight line perpendicular to the ground.
[0007] The above-mentioned pile foundation inclination measuring device is used for the shield cutting underground pile foundation model test. The equipment used for the shield cutting underground pile foundation test includes a test box. The test box contains a mixed soil layer and a concrete casting layer from bottom to top. The pile body of the underground pile foundation model is set in the mixed soil layer, and the surface of the pile body of the underground pile foundation model is flush with the bottom surface of the concrete casting layer.
[0008] Furthermore, a plurality of cavities are arranged above the pile body of the underground pile foundation model.
[0009] Furthermore, a first cavity is set above the pile body of the underground pile foundation model, and the bottom surface of the first cavity is flush with the top surface of the underground pile foundation model. A second cavity is set above the first cavity near the top of the test box, and the upper surface of the second cavity is flush with the top surface of the test box.
[0010] The above-mentioned pile foundation inclination measuring device used for shield cutting underground pile foundation model test has a shield opening at the bottom of one side of the test box, and the shield model enters and exits the test box through the shield opening.
[0011] Furthermore, the top of the shield model is located higher than the bottom of the underground pile foundation model.
[0012] The above-mentioned pile foundation inclination measuring device is used for shield cutting underground pile foundation model test. Expansion bolts are set at each test point of the pile body of the underground pile foundation model. One end of the traction line is connected to the expansion bolt, and the other end of the traction line is connected to the probe of the micrometer.
[0013] Furthermore, the test box is provided with a threading hole, and the traction wire passes through the threading hole and is connected to the micrometer.
[0014] The above-mentioned pile foundation inclination measuring device used for shield cutting underground pile foundation model test, the micrometers are all digital micrometers.
[0015] The above-mentioned pile foundation inclination measuring device used for shield cutting underground pile foundation model test, the traction line is a PE material braided line.
[0016] The above-mentioned pile foundation inclination measuring device for shield cutting underground pile foundation model test, the micrometer installed outside the test box is installed on the height adjustment device of the adjustment bracket, and the up and down movement of the height adjustment device drives the micrometer to move up and down, so that the micrometer and the corresponding measured point on the pile body of the underground pile foundation model are at the same height.
[0017] The utility model according to the above scheme has the beneficial effect of:
[0018] 1. The measuring device has a simple structure and few parts.
[0019] 2. The indirect measurement method is adopted to avoid the tedious operation of directly entering the test box for measurement during the cutting process, thus improving the measurement efficiency.
[0020] 3. There is no need to pause shield cutting for measurement, so the continuity of the test process can be maintained and the actual construction conditions can be simulated more realistically.
[0021] 4. By setting up multiple sets of micrometers on the pile body, the displacement data of the pile body at different heights can be obtained, so as to have a more comprehensive understanding of the inclination and displacement of the pile foundation. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 It is a structural schematic diagram of the utility model.
[0024] Among them, the reference numerals in the figure are:
[0025] 1. Micrometer; 2. Traction line; 3. Expansion bolt; 4. Underground pile foundation model; 5. Shield model; 6. First cavity; 7. Second cavity; 8. Mixed soil layer; 9. Concrete layer; 10. Test box. DETAILED DESCRIPTION
[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0027] A pile foundation inclination measuring device for shield cutting underground pile foundation model test, such as Figure 1 As shown, it includes several micrometers 1, each of which is connected to the pile body surface of the underground pile foundation model 4 through a traction line 2, and the micrometers 1 are divided into several groups, each group includes at least two micrometers 1, and the connection points of each group of micrometers 1 and the pile body of the underground pile foundation model 4 are all located on a straight line perpendicular to the ground.
[0028] The utility model measures the displacement data of the pile body of the underground pile foundation model 4 at two different positions on the same straight line through more than two micrometers 1, thereby obtaining the inclination data of the pile body of the underground pile foundation model 4 on the same straight line, and indirectly obtaining the displacement data of the underground pile foundation model 4, so as to continue to adjust the working parameters of the shield model 5 in subsequent tests.
[0029] The equipment used in the shield cutting underground pile foundation test includes a test box 10, and soil materials are arranged in layers inside the test box 10 to simulate the actual construction environment. From bottom to top, the test box 10 is respectively a mixed soil layer 8 and a concrete pouring layer, wherein the mixed soil layer 8 simulates the foundation soil of the construction site, and can collect drawings on site, mix and compact, and solidify according to the soil data of the construction site when necessary, so as to be close to the construction conditions of the construction site, and the concrete pouring layer is for engineering construction. The pile body of the underground pile foundation model 4 is arranged in the mixed soil layer 8, and the surface of the pile body of the underground pile foundation model 4 is flush with the bottom surface of the concrete pouring layer. In this embodiment, a first cavity 6 is arranged above the pile body of the underground pile foundation model 4, and a second cavity 7 is arranged above the first cavity 6 near the top of the test box 10, and the upper surface of the second cavity 7 is flush with the top surface of the test box 10. The existence of the first cavity 6 and the second cavity 7 is that the test box 10 simulates the specific structural conditions of the construction site, which means an underground space set in a concrete structure, such as an underground station, etc. In other embodiments, the cavity can be set according to the specific structure of the construction site, and its number and position can be changed. The cavity can be realized by setting a box structure, that is, a box is set at the position of the first cavity 6, and then concrete is poured to form it. After pouring a certain height, a second box is placed at the position of the second cavity 7, and concrete is continued to be poured to complete the setting of the cavity.
[0030] A shield opening is provided at the bottom of one side of the test box 10, and the shield opening is used as the inlet and outlet of the shield model 5. The shield model 5 is pushed into the mixed soil layer 8 inside the test box 10 under the action of the thrust device. The shield model 5 cuts the pile body of the underground pile foundation model 4 by an action similar to that of an actual shield machine, and the upper surface of the shield model 5 is flush with the position to be cut of the underground pile foundation model 4. In the process of the shield model 5 being pushed forward, the underground pile foundation is cut.
[0031] In this embodiment, the number of micrometers 1 is at least greater than two, and two points on the same straight line of the underground pile foundation are measured to calculate the inclination angle of the pile body, thereby obtaining the consequences caused by the shield model 5 during the test of the shield cutting the underground pile foundation model 4, so as to adjust the shield later.
[0032] During use, the dial gauge 1 is pulled out to ensure that the dial gauge 1 has a certain elastic expansion space, and the traction line 2 is made of a material with low elasticity, so that when the underground pile foundation model 4 is tilted, the displacement change can be quickly transmitted to the dial gauge 1 through the traction line 2, so that the dial gauge 1 can obtain a value under its own elasticity. In a certain embodiment, the traction line 2 is made of iron wire.
[0033] The dial gauges 1 are divided into several groups, each group has at least two dial gauges 1, and the connection points of each group of dial gauges 1 and the pile body of the underground pile foundation model 4 are all located on the same straight line perpendicular to the ground, thereby measuring the displacement deviation of the pile body of the underground pile foundation model 4 at this position, and indirectly obtaining the inclination data of the pile body of the underground pile foundation model 4. In the same group, according to the readings of any two dial gauges 1, the calculation is performed according to the following calculation formula
[0034] Q = (a1-a2) / (h1-h2)
[0035] γ=arctanQ
[0036] Wherein, Q is the inclination rate of the underground pile foundation model 4, a1 and a2 are the readings of any two micrometers 1 in the same group, h1 and h2 are the heights of the corresponding micrometers 1 from the ground, and γ is the inclination angle of the underground pile foundation model 4. In this way, according to the readings of any two micrometers 1 in the same group, the offset of the pile body of the underground pile foundation model 4 on this straight line can be obtained. In the three-dimensional structure diagram of the underground pile foundation model 4, it is assumed that the underground pile foundation model 4 is rigid and does not deform. According to the continuity of the position offset and the object, the displacement of the underground pile foundation model 4 under the cutting of the shield model 5 can be obtained.
[0037] In order to more clearly know the displacement deflection of the pile body of the underground pile foundation model 4 in all directions, and to more clearly understand the deformation of the pile body of the underground pile foundation model 4, multiple groups of micrometers 1 are set, and the connection points of different groups of micrometers 1 and the pile body of the underground pile foundation model 4 are located on different straight lines perpendicular to the ground, so as to more clearly understand the displacement of different points of the pile body of the underground pile foundation model 4. According to the continuity of the structure, the deformation of the underground pile foundation model 4 can be judged, and the displacement of the underground pile foundation model 4 can be more clearly understood.
[0038] In this embodiment, the micrometers 1 used are all digital micrometers 1 with a measuring range of 0 to 25.4 mm (1"), an accuracy of 0.001 mm (0.00005"), and a tolerance of less than ±0.007 mm.
[0039] On the pile body of the underground pile foundation model 4, expansion bolts 3 are arranged at each predetermined point to be tested, and one end of the traction line 2 is fixed on the expansion bolt 3. When the test box 10 is filled with soil to form a mixed soil layer 8, after filling to a certain height, the pile body of the underground pile foundation model 4 is stabilized in the mixed soil layer 8, and then the traction line 2 is led out of the test box 10 by traction (the traction line 2 can be led out by perforating), and then the soil, concrete and cavity are continuously filled upward. The traction line 2 pulled to the outside of the test box 10 is connected to the micrometer 1. When connected, the traction line 2 needs to be in a straightened state, and the other end of the traction line 2 is connected to the micrometer 1. In this embodiment, the traction line 2 is a braided line made of PE material with a diameter of 0.284mm and a pulling force of up to 14.3kg. This type of traction line 2 has the characteristics of high tensile strength and low ductility, and is not easy to produce errors due to wire extension when being pulled by the pile body. In addition, PE wire has good wear resistance and is not easily damaged or broken due to friction with the soil.
[0040] The micrometer 1 disposed outside the test box 10 is disposed on an adjustment bracket, and the adjustment bracket is provided with a height adjustment device. By adjusting the height of the height adjustment device, the height of the micrometer 1 is adjusted together, so that the micrometer 1 is at the same height as the corresponding point to be measured. In the first embodiment, the height adjustment device is a double-headed clamping structure, one end of which clamps the micrometer 1, and the other end is clamped on the adjustment bracket. In the second embodiment, the height adjustment device is a sliding device, and the adjustment bracket is provided with a screw structure, and a plurality of sliding devices are provided on the screw structure. The sliding device is driven to change height by rotating the screw, and a clamping member or a socket is provided on the sliding device, so that the micrometer 1 is clamped or inserted into the socket, so that the micrometer 1 is set at the same height as the point to be measured.
[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A pile foundation inclination measuring device for shield cutting underground pile foundation model test, characterized in that: It includes several groups of dial gauges, each group includes at least two dial gauges, each dial gauge is connected to the pile body surface of the underground pile foundation model through a traction line, and the connection point between each group of dial gauges and the pile body of the underground pile foundation model is located on a straight line perpendicular to the ground.
2. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 1, characterized in that: The equipment used in the shield cutting underground pile foundation test includes a test box, which contains a mixed soil layer and a concrete casting layer from bottom to top. The pile body of the underground pile foundation model is set in the mixed soil layer, and the surface of the pile body of the underground pile foundation model is flush with the bottom surface of the concrete casting layer.
3. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 2, characterized in that: A plurality of cavities are arranged above the pile body of the underground pile foundation model.
4. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 1, characterized in that: A shield opening is arranged at the bottom of one side of the test box, and the shield model enters and exits the test box through the shield opening.
5. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 4, characterized in that: The top of the shield model is higher than the bottom of the underground pile foundation model.
6. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 1, characterized in that: Expansion bolts are arranged at various points to be tested on the pile body of the underground pile foundation model, one end of the traction line is connected to the expansion bolt, and the other end of the traction line is connected to the probe of the micrometer.
7. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 6, characterized in that: The test box is provided with a threading hole, and the traction wire passes through the threading hole and is connected to the micrometer.
8. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 1, characterized in that: All micrometers are digital micrometers.
9. A pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 1, characterized in that: The traction line is a PE braided line.
10. The pile foundation inclination measuring device for shield cutting underground pile foundation model test according to claim 1, characterized in that: The micrometer arranged outside the test box is arranged on the height adjustment device of the adjustment bracket. The up and down movement of the height adjustment device drives the micrometer to move up and down, so that the micrometer is at the same height as the corresponding point to be measured on the pile body of the underground pile foundation model.