CN106052916A - Earth pressure box burying device and method for fill engineering - Google Patents

Abstract

The invention discloses an earth pressure box embedding device and method for filling engineering, which comprises a connecting rod, a box setting plate, a casing and a sealing cover. The connecting rod is a hollow threaded rod, which can be combined with connecting rods of different lengths to the designed length through the casing; the box setting plate can adjust the measurement position of the earth pressure cell through the positioning nut; the sealing cover is used to seal the top and bottom ends of the connecting rod. In this method, firstly, the disc box is fixed on the first connecting rod through the positioning nut, and adjusted to the designed measurement position; then, the earth pressure box is fixed in the box area of the box tray by welding; with the filling height increase, connect and fix the second connecting rod with the first connecting rod through the bushing, and install the earth pressure cell; The cover is sealed. The present invention has the advantages of simple overall structure, convenient operation and good use effect, and effectively guarantees the precision requirement for embedding the earth pressure box.

Description

An earth pressure box embedding device and method for filling engineering

technical field

The invention relates to an earth pressure box embedding device and method for filling engineering, and belongs to the technical field of on-site construction monitoring.

Background technique

With the continuous advancement of infrastructure projects such as railways, highways, and earth-rock dams in my country, long-term monitoring of stress and deformation in fill engineering has become the main data source for design optimization, construction control, and maintenance. Among them, the monitoring of stress usually depends on the earth pressure cell buried in the soil. In the prior art, the burial of earth pressure cells in fill engineering generally adopts the method of directly burying the earth pressure cells in the fill, but in this method, the earth pressure cells will settle with the settlement of the fill, so that the force of the earth pressure cells Changes in the way and location of the monitoring data lead to problems such as large errors and failures in the monitoring data. Therefore, there is an urgent need for an earth pressure cell embedding device and method with accurate measurement data and convenient embedding to solve the above problems.

Contents of the invention

The technical problem to be solved by the present invention is to provide an earth pressure cell device and method with a simple structure, easy to connect and embed, and provide a fixed end for the bottom surface of the earth pressure cell for filling engineering, thereby ensuring its position accuracy.

In order to solve the above technical problems, the technical solution adopted by this device is: an earth pressure cell embedding device for filling engineering, the key technology of which is: it includes at least two connecting rods for supporting the earth pressure cell and A box setting tray for adjusting its position, a sleeve for connecting two adjacent connecting rods and a sealing cover for sealing the connecting rods; the box setting tray is arranged on the connecting rods;

The connecting rod is a hollow threaded rod, the middle part of the hollow threaded rod is provided with a branch hole, and the top is provided with a bus hole;

The box setting plate is a rectangular plate, and the rectangular plate is provided with a positioning hole and a box setting area for supporting the earth pressure box, and the upper and lower sides of the rectangular plate are respectively equipped with location of the positioning nut;

The sealing cover includes a top cover at the top of the connecting rod and a bottom cover at the bottom.

Preferably, the hollow threaded rod, the rectangular disc, the positioning nut and the sleeve are all made of stainless steel.

Preferably, the connecting rod is a standard fitting with an inner diameter of 45mm, a wall thickness of 5mm, and a pitch of 4.5mm, and has three standard lengths of 0.3m, 0.5m and 1.0m.

Preferably, the line-dividing hole is 10cm-20cm long and 1cm wide.

Preferably, the wires of the earth pressure cell are led to the top of the device through the distribution hole and the bus hole respectively.

Preferably, the casing is an internally threaded stainless steel pipe with a height of 10 cm.

Preferably, the positioning holes and positioning nuts on the cassette-setting tray are matched with the hollow threaded rods; the cassette-setting area on the cassette-setting tray is used to place the box body of the earth pressure cell.

Preferably, the box body of the earth pressure box is fixed to the box-setting area on the box-setting tray by welding.

Preferably, the sealing cap is a thin-walled hollow rubber tube closed at one end, the outer diameter of which is the same as the inner diameter of the hollow threaded rod.

Earth pressure cell embedding method of the present invention is:

1) When the filling project is in progress, first take a section of connecting rod, seal the bottom of the hollow threaded rod with a sealing cover, and connect the positioning hole on the rectangular plate through which the earth pressure box that has been welded to the box-setting area of the box-setting area passes through. The rods are connected, and then adjusted to the measurement depth with the positioning nut and fixed, and the wires on the earth pressure box are led out from the inside of the connecting rod through some wire holes in the connecting rod, and buried in the soil;

2) After the filling of this layer is completed, connect the next connecting rod with a sleeve, and install the next earth pressure cell that has been welded to the box-setting plate. As the filling height increases, the connecting rod is added and fixed and buried After the earth pressure box reaches the designed filling height, lead all the wires of the earth pressure box through the bus hole at the top of the top connecting rod, and install the sealing cover to seal the top of the connecting rod;

The embedding process of the earth pressure cell of the present invention is completed step by step with the increase of the height of the filling. To ensure the embedding accuracy, it is necessary to ensure that the casket is tightly fixed with the positioning nut.

The beneficial effects produced by adopting the above-mentioned technical scheme are:

1. The present invention is provided with a connecting rod, a sleeve, a box tray, and a sealing cover, wherein the connecting rod is a hollow threaded rod with three lengths to choose from, and the connecting rods of different lengths can be combined through the sleeve to reach the designed length The box set plate is used to support the earth pressure box, and the measurement position of the earth pressure box can be adjusted through the positioning nut; the sealing cover is used to seal the top and bottom ends of the connecting rod to prevent damage during the construction process. The overall structure is simple, the operation is convenient, and the use effect is good, which effectively guarantees the accuracy requirement for the embedding of the earth pressure box.

2. This device provides a fixed end for the bottom surface of the earth pressure box, thereby preventing the earth pressure box from moving down and tilting due to factors such as filling settlement and other factors, ensuring accurate measurement of the overlying soil pressure and reducing errors .

3. The connecting rod of this device adopts three length standards of 0.3m, 0.5m and 1.0m, which are easy to mass produce, and can adapt to the change of filling height on site, effectively saving the test time.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the schematic diagram of connecting rod;

Fig. 3 is the schematic diagram of setting box tray;

Fig. 4 is a schematic diagram of the force situation of the earth pressure cell before using the device;

Fig. 5 is a schematic diagram of the force situation of the earth pressure cell after using the device;

Fig. 6 is a schematic diagram of the earth pressure value test of the silt at the same height in the three positions of the earth pressure cell test under the condition of graded heaping;

Fig. 7 is the test result schematic diagram of Fig. 6;

Among them, 1. connecting rod, 1-1, hollow threaded rod, 1-2, branch line hole, 1-3 bus hole; 2, box setting plate, 2-1, rectangular plate, 2-2, positioning hole, 2 -3, box setting area, 2-4, positioning nut; 3, bushing; 4-1, top cover, 4-2, bottom cover; 5, earth pressure box, 5-1 box body, 5-2, wire .

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to accompanying drawings 1 to 3, this embodiment includes at least two connecting rods 1, a box setting plate 2 for supporting the earth pressure cell 5 and adjusting its position, and a sleeve for connecting two adjacent connecting rods 1 3 and a sealing cover for sealing the connecting rod 1; the box tray 2 is located on the connecting rod 1; the sleeve 3 is an internally threaded stainless steel tube, which is used to connect connecting rods 1 of different lengths in combination, and its height is 10cm.

The connecting rod 1 is a hollow threaded rod 1-1, and the middle part of the hollow threaded rod 1-1 is provided with a branching hole 1-2, and the top of the shaft of the hollow threaded rod 1-1 is provided with a bus hole 1-3.

The box-setting disk 2 is a rectangular disk 2-1, and the rectangular disk 2-1 is provided with a positioning hole 2-2 and a box-setting area 2-3 for supporting the earth pressure box 5. 2-1 There are positioning nuts 2-4 for positioning and adjusting the position of the earth pressure box 5 on the upper and lower parts respectively;

The sealing cover includes a top cover 4-1 at the top of the connecting rod 1 and a bottom cover 4-2 at the bottom. The sealing cover is a thin-walled hollow rubber tube closed at one end, and its outer diameter is the same as the inner diameter of the connecting rod 1 .

The positioning hole 2-2 and the positioning nut 2-4 on the cassette setting tray 2 are matched with the hollow threaded rod 1-1, and are used to fix the cassette positioning tray 2 and adjust the position. The box-setting area 2-3 on the box-setting tray 2 is used for placing the box body 5-1 of the earth pressure box 5. The box body 5-1 of the earth pressure box 5 is fixed on the box-setting area 2-3 on the box-setting tray 2 by welding.

Referring to accompanying drawings 4 and 5, the working principle of the traditional earth pressure sensor is based on Newton's third law, that is, the earth pressure sensor responds to the reaction force of the earth pressure. At present, the method of embedding the earth pressure sensor is to place the earth pressure sensor directly in the soil layer. When the upper earth pressure changes, the earth pressure N is generated, and the earth pressure of the upper soil layer acts on the earth pressure sensor, and the earth pressure sensor transmits the stress to the The lower soil layer causes the lower soil layer to settle, and its action force is F, then the reaction force N` reflected by the earth pressure box is N`=N-F, that is, the earth pressure reflected by the earth pressure sensor is smaller than the actual earth pressure, the principle is as follows Figure 4 shows. Therefore, we fix one end of the earth pressure sensor so that the earth pressure sensor can fully reflect the change of the upper earth pressure N, that is, N=N`, the principle is shown in Figure 5.

Example 1

The earth pressure box embedding method process of the newly built subgrade earth pressure box embedding device is as follows:

When the filling project is carried out, first take a section of connecting rod 1, seal the bottom of the hollow threaded rod 1-1 with a sealing cover 4-2, bury the sealed connecting rod 1 in the soil to a certain depth, and weld it to the box. The earth pressure box 5 in the box setting area 2-3 of the disk 2 is connected with the connecting rod 1 through the positioning hole 2-2 on the rectangular disk 2-1 as a whole, and then adjusted to the measurement depth with the positioning nut 2-4 and fixed, and the earth pressure The wires on the box 5 are drawn from the inside of the connecting rod 1 through the part of the wire hole 1-2 in the connecting rod 1. After the filling of this layer is completed, connect the next connecting rod 1 with the sleeve 3, and install the next one that has been welded to the place. For the earth pressure box 5 of the box plate 2, as the fill height increases, add the connecting rod 1 and fix and bury the earth pressure box 5. After reaching the designed filling height, pass all the earth pressure box wires 5-2 through the top The bus hole 1-3 at the top of the connecting rod is drawn out, and the top cover 4-1 is installed to seal the top of the connecting rod 1.

In order to verify the feasibility of the whole test device, an indoor test simulation was carried out, as shown in Figure 6, the test used three positions of the earth pressure cell to test the earth pressure value of the silt at the same height under the condition of graded stacking. Among them, the earth pressure cell A is directly buried in the soil, the earth pressure cell B is buried by this device, and the earth pressure cell C is placed on the supporting platform (for verifying the feasibility of this device). The test results are shown in Fig. 7. It can be seen that the accuracy of measurement by this device is higher.

Claims (10)

1. the soil pressure cell inbuilt device for embankment engineering, it is characterised in that: it include at least two connecting rods (1), For support soil pressure cell (5) and adjust its position put box dish (2), for connect two adjacent connecting rods (1) sleeve pipe (3) with And it is used for being tightly connected the sealing lid of bar (1)；Put box dish (2) to be located in connecting rod (1)；

Described connecting rod (1) is a cannulated threaded bar (1-1), and described cannulated threaded bar (1-1) middle part is provided with separated time hole (1-2), Top is provided with total string holes (1-3)；

Described box dish (2) of putting is a rectangular disk (2-1), and described rectangular disk (2-1) is provided with hole, location (2-2) and for support The Zhi He district (2-3) of soil pressure cell (5), described rectangular disk (2-1) upper and lower is respectively provided with location and positioning soil pressure cell (5) the location nut (2-4) of position；

Described sealing lid includes the bottom (4-2) being positioned at the top cover (4-1) on connecting rod (1) top, bottom.

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 1, it is characterised in that: in described Empty threaded rod (1-1), rectangular disk (2-1), location nut (2-4) and sleeve pipe (3) are stainless steel.

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 1, it is characterised in that: described company Extension bar (1) is internal diameter 45mm, wall thickness 5mm, the standard fitting of pitch 4.5mm, has tri-kinds of full-lengths of 0.3m, 0.5m and 1.0m.

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 1, it is characterised in that: described point String holes (1-2) long 10cm ~ 20cm, a width of 1cm.

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 3, it is characterised in that: described soil The wire (5-2) of pressure cell (5) threads to the top of this device respectively by separated time hole (1-2) and total string holes (1-3).

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 1, it is characterised in that: described set Pipe (3) is female thread stainless steel tube, and its height is 10cm.

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 1, it is characterised in that put described in: Hole, location (2-2) and location nut (2-4) on box dish (2) are mated with cannulated threaded bar (1-1)；Described put on box dish (2) Zhi He district (2-3) is used for placing the box body (5-1) of soil pressure cell (5).

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 7, it is characterised in that: described soil The box body (5-1) of pressure cell (5) uses the mode of welding to be fixed on and puts box dish (2) Shang Zhihe district (2-3).

A kind of soil pressure cell inbuilt device for embankment engineering the most according to claim 1, it is characterised in that: described close Capping (4) is the rubber tube of the single-ended closing of thin-walled hollow, and its external diameter is identical with the internal diameter of cannulated threaded bar (1-1).

10. the method for embedding of the soil pressure cell inbuilt device described in any one of claim 1-9, it is characterised in that:

1) when embankment engineering is carried out, first take one section of connecting rod (1), with bottom (4-2), hollow threaded rod (1-1) bottom is carried out Seal, the soil pressure cell (5) being soldered to Zhi He district (2-3) entirely through the hole, location (2-2) in rectangular disk (2-1) and is connected Extension bar (1) is connected, and then measures position with location nut (2-4) regulation extremely design and fixes, by the wire on soil pressure cell (5-2) by partial line hole (1-2) in connecting rod (1) from the internal extraction of connecting rod (1), and it is buried in the earth；

2), after this layer of embankment completes, connect next joint connecting rod (1) with sleeve pipe (3), and the next one is installed is soldered to put box dish (2) soil pressure cell (5) on, along with the rising of the depth of fill, increases connecting rod (1) and fixes and bury soil pressure cell (5) underground, reaching After design filled height, all of soil pressure cell wire (5-2) is drawn by total string holes (1-3) at connecting rod (1) top, And top cover (4-1) is installed connecting rod (1) top is sealed；During embankment engineering is carried out, measure the pressure that bankets in time.