CN103711152B - X-type Model Pile loads monitoring device and monitoring method - Google Patents

Abstract

The invention discloses a kind of X-type Model Pile and load monitoring device and monitoring method, this device comprises and holds soil container, charger and monitoring device.The method the X-type Model Pile of pre-buried good sensor fibre is embedded in the soil body of appearance soil container, again charger is connected by channel-section steel with appearance soil container, vertical load is applied to X-type Model Pile, by the monitoring device monitoring ess-strain situation of X-type Model Pile in loading procedure, to simulating the effect of oil and pile under pressure and the bearing capacity of stake and deformation.The present invention can the loading environment of accurate Control experiment, the stress deformation situation of monitoring X-type Model Pile in soil, and improves a shape and size targetedly according to result of the test, more meets engineering practice requirement.And device simple installation, be easy to control, can be recycled, little on pile body impact.

Description

X-type model pile loading monitoring device and monitoring method

technical field

The invention relates to a test device and a test method of a foundation structure, in particular to an X-type model pile loading monitoring device and a monitoring method.

Background technique

In actual engineering, the cost of on-site pile foundation inspection is relatively high, and the monitoring test is difficult and inconvenient to control various parameters during the test process due to site and condition constraints. The test loading of engineering pile foundation needs to design and arrange the reaction force device. Due to the large load, the reaction force device has high requirements, and the on-site installation is time-consuming and laborious. The traditional stress-strain sensor adopts electromagnetic or vibrating wire sensor, which has many installation procedures and low survival rate in the field, and is a point sensor, which can only monitor the stress and strain of the designated part of the pile foundation. Due to the complex engineering geological conditions, it is very difficult to Leaks may occur when analyzing the interaction between the pile and the soil or the stress on the pile body. If a more comprehensive analysis of the characteristics of the pile in the soil is required, more sensors must be arranged, and there are too many wires drawn from the sensors. It will affect the quality of the pile body, and it will be very troublesome in the actual construction process. Therefore, it is particularly important to adopt a simple and fully distributed monitoring method to analyze the stress and deformation of piles. It is necessary to design a device that can accurately load the X-shaped model pile indoors and fully distributed monitor the stress and strain of the pile body. method.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an X-type model pile loading monitoring device and monitoring method.

Technical solution: In order to solve the above technical problems, the X-type model pile loading monitoring device provided by the present invention includes:

The soil container has a vertical side wall and an opening at the top, filled with soil, an X-shaped model pile is embedded in the soil, and a column is connected to the side wall;

The loading device includes a reaction force cover plate fixedly connected to the column, and a jack, a load sensor, a force transmission column and a gasket are sequentially installed between the reaction force cover plate and the X-shaped model pile from top to bottom;

The monitoring device includes a sensing optical fiber installed along the X-shaped model pile, an optical fiber data acquisition instrument connected to the sensing optical fiber, and a load display connected to the load sensor through a cable.

Preferably, the channel steels are distributed symmetrically outside the side wall of the soil container.

Preferably, the soil container is rectangular, and the side walls are welded with channel steel.

Preferably, the reaction force cover plate is welded to the channel steel, and the side wall is hinged to the channel steel.

When in use, the monitoring method of the above-mentioned loading monitoring device includes the following steps:

1) Make X-shaped model piles and scale them down in proportion to the full-size X-shaped concrete piles on site;

2) Make a groove on the surface of the X-shaped model pile, straighten the sensing fiber into the groove, fill and smooth the groove with epoxy resin;

3) Arrange soil container, loading device and monitoring device;

4) Precisely control the loading condition of the jack according to the reading of the load sensor, and continuously monitor the stress and deformation of the X-type model pile in the soil by using the optical fiber data acquisition instrument.

Beneficial effects: the present invention adopts the device and method of the model test, the loaded load is smaller than the load of the on-site load test, the jack is used as the loading device, the load sensor is used to accurately determine the size of the load, and the X-type model pile is applied to the vertical In the process of axial loading, the stress and strain of X-shaped model piles are monitored by monitoring devices in order to simulate the interaction between piles and soil and the bearing capacity and deformation of piles under pressure. The invention can accurately control the loading conditions of the test, monitor the force deformation of the X-shaped model pile in the soil, and improve the shape and size of the pile according to the test results, which is more in line with the requirements of engineering practice. The device of the invention has the advantages of simple installation, easy control, recyclable use and the like, and the distributed sensing optical fiber used has little influence on the pile body.

Description of drawings

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

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a sectional view of the X-shaped model pile in Fig. 1 .

Detailed ways

Embodiment: The X-type model pile loading monitoring device of this embodiment is shown in Fig. 1 and Fig. 2, comprises the soil container 9 that has vertical side wall and top opening, wherein is filled with soil 12, is embedded with X in soil 12 Type model pile 8, four channel steels 13 are symmetrically distributed outside the side wall of soil container 9, and soil container 9 is fixedly connected with channel steel 13, can adopt the mode of welding or hinged joint.

The loading device includes a reaction force cover plate 3 welded with channel steel 13, and a jack 4, a load sensor 5, a force transmission column 6 and a spacer 7 are sequentially installed between the reaction force cover plate 3 and the X-shaped model pile 8 from top to bottom .

The monitoring device includes a sensing optical fiber 10 and an optical fiber data acquisition instrument 1 connected thereto, a load sensor 5 , a cable 11 and a load display 2 sequentially connected.

As shown in FIG. 3 , a sensing optical fiber 10 is installed along the X-shaped model pile 8 .

During use, the X-type model pile loading monitoring method of the present embodiment comprises the following steps:

1. According to the principle of similarity, the X-shaped concrete piles of sufficient size on site are reduced in proportion to the prefabricated X-shaped model piles.

2. Open a 5mm deep groove on the surface of the prefabricated X-shaped model pile, clean the groove with a small brush and a hair dryer, fix the straightened sensing fiber in the groove with quick-drying glue, and then use a ring Use epoxy resin for encapsulation, blow dry the epoxy resin with a hair dryer or wait for it to dry naturally.

3. First lay a certain thickness of soil in the soil container, then put the pre-embedded X-shaped model piles into the soil container, and then arrange the required soil layer by layer in the soil container to the designated position. Place gaskets, force transmission columns, load sensors, etc. on the top of the pile in sequence, and preload them with a jack to make the parts closely contact. At the same time, check and adjust so that the load that the jack can apply can just be transferred to the top of the pile.

Among them, the size of the soil container is 1.5m*1m*1m, which is welded by four steel plates. The reaction cover is made of a 3cm*100cm*100cm steel plate, and the jack is fixed on the reaction cover with high-strength bolts. The length and strength of the force transmission column can be determined according to the distance from the top of the X-shaped model pile to the jack and the maximum load required for the test. The size of the spacer is determined according to the size of the X-type model pile, whichever can cover the pile head of the X-type model pile.

4. Connect the load sensor to the load display, connect the sensing fiber to the fiber optic data acquisition instrument, adjust various coefficients, and check whether the loading and monitoring system is normal. If not, check whether there is a problem with the connection of each component, whether the sensing fiber is If it is broken, repair it, and if it is normal, you can test it.

5. Accurately control the loading conditions of the jack according to the readings of the load sensor, use the optical fiber data acquisition instrument to continuously monitor the stress and deformation of the X-type model pile in the soil, and improve the shape and size of the pile according to the test results.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (1)

1. X-type Model Pile loads a monitoring method, it is characterized in that comprising the following steps:

1) X-type Model Pile is made, according to the X-type concrete pile scaled down that on-the-spot full size is very little;

2) X-type Model Pile surface fluting, be distributed in groove by stretching for sensor fibre, with epoxy resin by groove fill, floating;

3) appearance soil container, charger and monitoring device is arranged:

Wherein holding soil container is the open top receptacle with upright side walls, wherein be filled with soil, X-type Model Pile is embedded with in soil, described sidewall is connected with column, described column is made up of four channel-section steels, described channel-section steel distributes in the sidewall external symmetry of container, and described appearance soil container is rectangle, and described sidewall welds with channel-section steel;

Charger comprises the counter-force cover plate be fixedly connected with column, from top to bottom jack, load sensor, force-transmitting pole and pad are installed successively between described counter-force cover plate and described X-type Model Pile, described counter-force cover plate welds with channel-section steel, described sidewall and channel-section steel hinged;

Monitoring device comprises the sensor fibre installed along X-type Model Pile, is connected to the fiber data Acquisition Instrument of sensor fibre, and by load display that cable is connected with load sensor;

4) reading of foundation load sensor accurately controls the loading environment of jack, utilizes fiber data Acquisition Instrument to monitor the stress deformation situation of X-type Model Pile in soil continuously.