CN105424910B - Device for measuring layered settlement of soil mass - Google Patents

Abstract

The invention provides a soil layered settlement measurement device, which includes three parts: a model box, a settlement measurement assembly and a pressurizing device. The model box is a cube structure with an open top, and the settlement measurement assembly includes a base, a positioning rod, a settlement tube and Motion detector. The outer diameters of the settling tubes are different in size and height, and two positioning slides are engraved on the inner wall of the settling tube diameter, and balls are embedded in the positioning slides. The sensor frame is connected to the sensor and fixed on the positioning rod, the pointer is lapped on the L-shaped sheet, and the wire is connected to the PC. A plurality of settling tubes are inserted into the main pole in order from small to large outer diameters, wherein the height of the settling tubes is determined according to the measured soil depth. The pressure of the soil layer is transmitted through the hydraulic pump, and the settlement data of each layer of the soil layer is collected through the PC. The settlement measuring device of the invention realizes the settlement measurement of single hole and multiple points of the soil body, can well measure the layered settlement of the soil layer, and is very suitable for indoor model box tests.

Description

A Soil Layer Settlement Measuring Device

technical field

The invention relates to the technical field of soil engineering model tests, in particular to a soil layered settlement measurement device.

Background technique

In my country's coastal areas, many engineering foundations are often formed by using soft soil after reinforcement treatment. Because soft soil has the characteristics of high compressibility, large void ratio, and low permeability, it will cause irregular settlement of buildings. The cracking of the wall caused great damage to the stability of the building. In order to control the stability of soft soil foundation and ensure the safety of buildings, it is very necessary to test the settlement of foundation soil. Due to the long period, high cost and many influencing factors of the field test, the indoor model test has become the main research method in the field of scientific research. The indoor model test is an important part of the geotechnical engineering test. In addition to the settlement of the soil surface, it is also required to measure the layered settlement of the soil. By testing the settlement of soil layers at different depths, we can understand the deformation characteristics of soil layers at different depths, and then explore the construction methods and reconstruction measures to control the deformation of foundation soil. The common indoor soil layered settlement test method is to place a settling plate in the soil layer, the settling plate is connected with the settling bar and extends out of the model box, and when the soil is pressurized, the descending height of the settling bar is observed by measuring instruments and then Get the settlement of the soil layer. The problem is that when it is required to measure multiple measuring points with different depths in the soil layer, multiple settlement tubes need to be inserted. Due to the limited surface area of the soil in the model box, it is difficult to avoid the soil squeezing effect formed between the rods. , affecting the accuracy and reliability of the measured values.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a soil layered settlement measurement device, which can realize single-hole multi-point settlement measurement of the soil in the model box.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A soil layered settlement measurement device, comprising a model box (1), a settlement measurement component (2) and a pressurizing device (3), the model box (1) is a cube structure with an open top, and the settlement measurement component (2) consists of a positioning rod (4), a base (5) for fixing the positioning rod (4), a settlement sleeve (6) and a displacement sensor (7) sleeved on the positioning rod (4), and the The settling casing (6) includes 2 to 5 settling tubes (8), each settling tube (8) is set on the positioning rod (4), and a positioning slideway is arranged between adjacent settling tubes (8) (9), the positioning slide (9) is provided with a ball, the upper part of the settling tube (8) is connected with an L-shaped sheet (10), and one end of the pointer of the displacement sensor (7) is lapped on the L-shaped On the sheet (10), the other end of the pointer of the displacement sensor (7) is connected to the PC through a wire, the settlement measurement assembly (2) is arranged in the model box (1), and the pressurizing device (3 ) includes a hydraulic pump (11), a pressure transmission rod (12) and a pressure bearing plate (13) connected to the end of the pressure transmission rod (12), the upper part of the pressure bearing plate (13) has an opening, covering the The mouth of the model box (1).

Preferably, the bottom end of the settling tube (8) is extended with a sensing piece (14), and the shape of the sensing piece (14) is circular.

Preferably, the shape of the base (5) of the settlement measurement assembly (2) is square, and the size is 1/5-2/5 of the model box (1).

Preferably, the number of the displacement sensor (7) is consistent with that of the settling tube (8).

Preferably, the size of the pressure bearing plate (13) is consistent with that of the opening of the model box (1).

The working principle of the measuring device of the present invention is as follows:

A soil layered settlement measurement device. The settlement measurement components are placed in the model box. The diameters and heights of the settlement tubes are different, and they are set on the positioning rod in turn. The displacement sensor is fixed on the positioning pole through the sensor frame. The sensor pointer One end of the sensor is lapped on the L-shaped sheet connected to the settlement tube, the other end of the sensor pointer is connected to the PC through a wire, and the pressure is transmitted to the pressure plate through the hydraulic pump to uniformly pressurize the soil layer. The sensor plate connected to the tube will sink due to the pressure, and the pointer of the displacement sensor lapped on the tube will also move down accordingly. of settlement.

The beneficial effects of the present invention have:

(1) The inner wall of the pipe diameter of the settling tube adopted by the settlement measuring device of the present invention is provided with two positioning slides, and balls are embedded in the positioning slides, and a plurality of settling tubes are inserted into the main body benchmark in turn to pressurize the soil layer At this time, the settling tubes with different outer diameters will sink with the pressure on the soil. At this time, the balls embedded in the positioning slide can effectively reduce the friction between the tubes and prevent the settling tubes rotate with each other.

(3) The settlement measurement device of the present invention can realize the settlement measurement of single hole and multiple points of the soil, thereby avoiding the soil squeezing effect between the rods caused by too many measuring points and too dense settlement pipes inserted into the soil .

Description of drawings:

Fig. 1 is the front view of the settlement measuring device of the present invention;

Fig. 2 is the front view of the settlement measuring assembly of the present invention;

Fig. 3 is the sectional view of settling tube of the present invention;

Fig. 4 is a top view of the settling tube of the present invention.

In the figure, 1. Model box, 2. Settling measurement component, 3. Pressurizing device, 4. Positioning rod, 5. Base, 6. Settling sleeve, 7. Displacement sensor, 8. Settling tube, 9. Positioning slideway , 10, L-shaped sheet, 11, hydraulic pump, 12, pressure transmission rod, 13, pressure plate, 14, sensor sheet, 15, drainage hole.

detailed description

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figures 1 to 4, a soil layered settlement measurement device includes a model box (1), a settlement measurement assembly (2) and a pressurizing device (3), characterized in that: the model box (1 ) is a cube structure with an opening at the top, and the settlement measurement assembly (2) consists of a positioning rod (4), a base (5) for fixing the positioning rod (4), and a settlement cover set on the positioning rod (4). tube (6) and a displacement sensor (7), the settling sleeve (6) includes 2 to 5 settling tubes (8), and positioning slides (9) are arranged between the adjacent settling tubes (8) , some balls are set in the positioning slideway, and the settling tube (8) is of different diameters and heights. Its height is determined according to the depth of the preset settlement measuring points before the test, and its quantity is determined according to the number of measuring points. Described a plurality of sensor chips (14) are engraved with screw thread, and its outer diameter is consistent, and settling tube (8) is connected with sensor chip (14) by screw thread, and the number of described sensor chip (14) is greater than 2. The specifications and sizes of the multiple L-shaped sheets (10) are all the same, and the settling tube (8) and the L-shaped sheets (10) are connected by bolts. During the embedding process, set each settling tube (8) on the positioning rod (4) in turn according to the depth of the measuring point. decrease with increasing outer diameter. Its described displacement sensor (7) is fixed on the positioning pole (4) by sensor frame, and described multiple displacement sensor (7) pointers are overlapped successively on each L-shaped sheet (10), and described multiple displacement sensor ( 7) The other end of the pointer is connected to the PC through a wire, the pressure is provided by the hydraulic pump (11), and the pressure is transmitted to the pressure bearing plate (13) connected to it through the pressure transmission rod (12), and then the soil in the box is carried out. Evenly pressurize, when the soil in the box is pressurized, the subsidence of the soil will drive the settlement tube (8) to move down, at this time, the pointer of the displacement sensor (7) will drop accordingly, and the value of the drop can be checked by the PC obtained from the data collected by the machine.

The settlement measurement device of this embodiment can effectively reduce the number of settlement rods inserted into the box, and effectively avoid the soil squeezing effect between the rods caused by too many measuring points and too dense settlement pipes inserted into the soil, thereby realizing It realizes the settlement measurement of single hole and multiple points of the soil, and is easy to operate. The data is measured by a high-precision displacement sensor and collected by a PC. The readings are accurate and reliable, and it is very suitable for indoor model box tests.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should fall within the protection scope of the present invention. within.

Claims (8)

1. a kind of soil body delaminating deposition measurement apparatus, including model casing (1), settlement measurement component (2) and pressue device (3), its It is characterised by：The model casing (1) for top end opening cube structure, the settlement measurement component (2) by locating rod (4), The base (5) of the fixation locating rod (4), the sedimentation sleeve pipe (6) being enclosed within the locating rod (4) and displacement transducer (7) group Into sedimentation sleeve pipe (6) is including 2～5 sedimentation pipes (8), and each sedimentation pipe (8) is enclosed within the locating rod (4), adjacent It is provided between sedimentation pipe (8) in locator slide (9), locator slide and ball is set, it is thin that sedimentation pipe (8) top is connected with L-type Piece (10), one end of institute's displacement sensors (7) pointer is overlapped on L-type thin slice (10), institute's displacement sensors (7) pointer The other end is connected on PC by wire；The settlement measurement component (2) is arranged in the model casing (1), the pressurization Device (3) is including hydraulic pump (11), pressure actuation bar (12) and is connected to the bearing plate of pressure actuation bar (12) end (13), opening is arranged at bearing plate (13) top, is covered on the case mouth of the model casing (1)；The bottom of the sedimentation pipe (8) Extension is provided with vane (14).

2. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：The vane (14) It is generally circular in shape.

3. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：The settlement measurement component (2) base (5) is shaped as square, and the size of the base (5) of the settlement measurement component (2) is the model casing (1) 1/5～2/5.

4. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：Institute's displacement sensors (7) it is consistent with the quantity of the sedimentation pipe (8).

5. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：The bearing plate (13) with The consistent size of model casing (1) the case mouth.

6. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：The sedimentation pipe (8) with The vane (14) is attached by screw thread.

7. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：The L-type thin slice (10) Quantity be more than 2, the specification size of the L-type thin slice (10) is identical.

8. a kind of soil body delaminating deposition measurement apparatus according to claim 1, it is characterised in that：The sedimentation pipe (8) with The L-type thin slice (10) is attached by bolt.