阅读说明：本技术 一种预应力竖向孔道灌浆压力泌水试验装置及试验方法 (Grouting pressure bleeding test device and method for prestressed vertical duct ) 是由 付凯明 刘康 刘军 李光远 朱贵超 金显龙 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种预应力竖向孔道灌浆压力泌水试验装置及试验方法,其中实验装置包括灌浆装置、加压装置以及柱状压力容器；所述压力容器包括一密闭筒体及设置在所述密闭筒体上的进浆口、排气口以及泌水排出口；在所述进浆口和排气口分别设置有阀门以及压力表；所述加压装置可通过所述排气口向所述柱状压力容器内充气加压；所述灌浆装置通过所述进浆口向所述柱状压力容器内灌浆。本发明一种预应力竖向灌浆压力泌水试验装置及试验方法,可准确模拟现场竖向灌浆时压力泌水情况,使得正式灌浆时提前得到相关数据,有效减少正式灌浆出现不可预见的压力泌水情况。(The invention discloses a grouting pressure bleeding test device and a test method for a prestressed vertical duct, wherein the test device comprises a grouting device, a pressurizing device and a columnar pressure container; the pressure container comprises a closed cylinder body, and a slurry inlet, an exhaust port and a bleeding discharge port which are arranged on the closed cylinder body; the slurry inlet and the exhaust port are respectively provided with a valve and a pressure gauge; the pressurizing device can inflate and pressurize the columnar pressure container through the exhaust port; and the grouting device is used for grouting into the columnar pressure container through the grout inlet. The prestress vertical grouting pressure bleeding test device and the test method can accurately simulate the pressure bleeding situation during on-site vertical grouting, so that related data can be obtained in advance during formal grouting, and unpredictable pressure bleeding situations during formal grouting can be effectively reduced.)

1. The utility model provides a vertical grout pressure bleeding test device of prestressing force which characterized in that: comprises a grouting device, a pressurizing device and a columnar pressure container; the pressure container comprises a closed cylinder body, and a slurry inlet, an exhaust port and a bleeding discharge port which are arranged on the closed cylinder body; the slurry inlet and the exhaust port are respectively provided with a valve and a pressure gauge; the pressurizing device can inflate and pressurize the columnar pressure container through the exhaust port; and the grouting device is used for grouting into the columnar pressure container through the grout inlet.

2. The prestressed vertical grouting pressure bleeding test device according to claim 1, characterized in that: the closed cylinder body consists of a cylinder body and a cover plate arranged at the upper end of the cylinder body; the exhaust port is disposed on the cover plate.

3. The prestressed vertical grouting pressure bleeding test device according to claim 2, characterized in that: and a steel strand is arranged in the cylinder.

4. The prestressed vertical grouting pressure bleeding test device according to claim 2, characterized in that: the cover plate is formed by welding a carbon steel disc and a steel pipe, a hole with the same size as the outer diameter of the steel pipe is formed in the center of the disc, bolt holes are formed in the periphery of the disc, and the pressure gauge and the ball valve are sequentially connected to the steel pipe.

5. The prestressed vertical grouting pressure bleeding test device according to claim 2, characterized in that: a carbon steel flange plate is welded at the top of the cylinder body, bolt holes are formed in the periphery of the cylinder body, and carbon steel stiffening ribs are additionally arranged; the cylinder body is fixed with the carbon steel disc bolt of the cover plate through the carbon steel flange plate.

6. The prestressed vertical grouting pressure bleeding test device according to claim 1, characterized in that: the bleeding outlet is connected out by a steel pipe and is connected with a ball valve.

7. The prestressed vertical grouting pressure bleeding test device according to claim 1, characterized in that: the grouting device adopts a grouting pump for grouting; the pressurizing device adopts an air compressor to pressurize.

8. The test method of the prestressed vertical grouting pressure bleeding test device based on any one of claims 1-7 is characterized by comprising the following steps:

step 1: connecting a pressurizing device to an exhaust port of the columnar pressure container, closing a bleeding observation hole and a grout inlet valve, opening an exhaust port valve at the top of the cover plate, and performing the next step after the air tightness is qualified;

step 2: closing an exhaust port valve at the top of the cover plate, and opening a slurry inlet valve;

and 3, step 3: the grout inlet is connected with a grouting device, and grouting is started into the columnar pressure container;

and 4, step 4: observing the pressure gauge at the top of the cover plate and the grout inlet, stopping grouting when the pressure value of the pressure gauge at the top reaches the required pressure, and closing the valve of the grout inlet, wherein the pressure gauge at the grout inlet is used for checking the pressure value of the pressure gauge at the top;

and 5, step 5: standing, observing a top pressure gauge every 15-30 minutes, and performing pressure compensation by using a pressurizing device if pressure loss exists;

and 6, step 6: and opening a ball valve at the top of the cover plate to release pressure after the specified time, opening a bleeding observation hole after the pressure release is finished, and recording the bleeding height and the bleeding amount of the slurry.

9. The assay of claim 8, further comprising:

and 7, step 7: and (5) adjusting the pressure or standing time, and repeating the steps to obtain a plurality of groups of data of the bleeding height and the bleeding amount of the slurry.

10. The test method as claimed in claim 8, wherein the pressure value of the top pressure gauge is checked by the difference between the pressure value of the pressure gauge at the slurry inlet and the pressure value of the top pressure gauge, and the difference between the two is 0.8 to 1.2 bar.

The technical field is as follows:

the invention relates to a prestressed vertical grouting pressure bleeding test device, belongs to the technical field of construction of constructional engineering, and particularly belongs to the technology of prestressed construction.

Background art:

the prestressed cement slurry contains bound water and free water, and after the slurry bears certain pressure, a large amount of free water in the cement slurry can be separated out, namely a 'bleeding phenomenon' occurs. For example, in the construction of a large-scale LNG storage tank with a bonded post-tensioned prestressing method, when the height of a prestressing vertical duct is more than 50m, a large amount of bleeding is generated due to huge pressure borne by slurry in the grouting process, so that a bleeding test needs to be performed on the slurry before formal grouting to grasp the bleeding condition of the slurry, thereby improving the slurry performance or improving the grouting process. At present, a slurry body pressure bleeding device sold and used in the market can only test the pressure bleeding condition of pure slurry in a static state, and cannot simulate the bleeding condition of the slurry in a dynamic state and under a prestressed steel strand in actual grouting.

The invention content is as follows:

the invention aims to provide a test device and a test method capable of simulating slurry pressure bleeding condition in actual grouting of a prestressed vertical duct.

In order to solve the technical problems, the invention adopts the technical scheme that:

the utility model provides a vertical grout pressure bleeding test device of prestressing force which characterized in that: comprises a grouting device, a pressurizing device and a columnar pressure container; the pressure container comprises a closed cylinder body, and a slurry inlet, an exhaust port and a bleeding discharge port which are arranged on the closed cylinder body; the slurry inlet and the exhaust port are respectively provided with a valve and a pressure gauge; the pressurizing device can inflate and pressurize the columnar pressure container through the exhaust port; and the grouting device is used for grouting into the columnar pressure container through the grout inlet.

The closed cylinder body consists of a cylinder body and a cover plate arranged at the upper end of the cylinder body; the exhaust port is disposed on the cover plate.

And a steel strand is arranged in the cylinder.

The cover plate is formed by welding a carbon steel disc and a steel pipe, a hole with the same size as the outer diameter of the steel pipe is formed in the center of the disc, bolt holes are formed in the periphery of the disc, and the pressure gauge and the ball valve are sequentially connected to the steel pipe.

A carbon steel flange plate is welded at the top of the cylinder body, bolt holes are formed in the periphery of the cylinder body, and carbon steel stiffening ribs are additionally arranged; the cylinder body is fixed with the carbon steel disc bolt of the cover plate through the carbon steel flange plate.

The bleeding outlet is connected out by a steel pipe and is connected with a ball valve.

The grouting device adopts a grouting pump for grouting; the pressurizing device adopts an air compressor to pressurize.

A prestressed vertical grouting pressure bleeding test method is characterized by comprising the following steps:

step 1: connecting a pressurizing device to an exhaust port of the columnar pressure container, closing a bleeding observation hole and a grout inlet valve, opening an exhaust port valve at the top of the cover plate, and performing the next step after the air tightness is qualified;

step 2: closing an exhaust port valve at the top of the cover plate, and opening a slurry inlet valve;

and 3, step 3: the grout inlet is connected with a grouting device, and grouting is started into the columnar pressure container;

and 4, step 4: observing the pressure gauge at the top of the cover plate and the grout inlet, stopping grouting when the pressure value of the pressure gauge at the top reaches the required pressure, and closing the valve of the grout inlet, wherein the pressure gauge at the grout inlet is used for checking the pressure value of the pressure gauge at the top;

and 5, step 5: standing, observing a top pressure gauge every 15-30 minutes, and performing pressure compensation by using a pressurizing device if pressure loss exists;

and 6, step 6: and opening a ball valve at the top of the cover plate to release pressure after the specified time, opening a bleeding observation hole after the pressure release is finished, and recording the bleeding height and the bleeding amount of the slurry.

Further comprising:

and 7, step 7: and (5) adjusting the pressure or standing time, and repeating the steps to obtain a plurality of groups of data of the bleeding height and the bleeding amount of the slurry.

And checking the pressure value of the top pressure gauge through the difference value between the pressure value of the slurry inlet pressure gauge and the pressure value of the top pressure gauge, wherein the pressure value of the slurry inlet pressure gauge is 0.8-1.2bar higher than the pressure value of the top pressure gauge.

Compared with the prior art, the invention has the beneficial effects that:

the invention relates to a vertical duct grouting pressure bleeding test device and a test method, which can simulate the gradual pressurization state of slurry in the flowing process in the actual grouting process by compressing air to reach the required pressure, and are more consistent with the actual working condition.

Compared with the test that the test device on the market pressurizes the upper part to a certain pressure and then discharges the bleeding water from the bottom in a static state, by using the grouting pressure bleeding test device for the prestressed vertical duct, the bleeding water is naturally separated out from the upper part of the pipeline under the gradually rising and pressurizing state of the slurry, the similarity rate of the bleeding water condition of the slurry and the bleeding water condition generated by actual grouting reaches more than 90 percent, the test effect is obvious, and the test accuracy is greatly improved.

Practice proves that the device and the test method have the following advantages by multiple tests and combining with the field formal grouting condition:

the method can simulate the actual grouting condition on site, increases the dynamic grouting process from the previous single pressure bleeding test, can simulate the influence of the steel strand on the bleeding of slurry, and fits the actual condition, so that the test is more convincing;

and no additional pressurizing equipment is needed, and the grouting pump is used for pumping pressure and combining the principle of compressed air to enable the test to reach the required pressure.

In conclusion, by using the prestress vertical grouting pressure bleeding test device and the test method, the pressure bleeding situation in field vertical grouting can be accurately simulated, so that related data can be obtained in advance in formal grouting, and unpredictable pressure bleeding situations in formal grouting can be effectively reduced.

Description of the drawings:

FIG. 1 is an overall schematic view of a prestressed vertical grouting pressure bleeding test device;

FIG. 2 is a schematic view of a pressure vessel of the prestressed vertical grouting pressure bleeding test device;

fig. 3 is a schematic diagram of a cover plate of a pressure vessel of the prestressed vertical grouting pressure bleeding test device.

Wherein: 11. a pressure vessel; 12. grouting pump; 13. an air compressor; 21. a cover plate; 22. a barrel; 23. a pressure gauge; 24. a bleeding observation hole; 25. a ball valve; 26. a pulp inlet.

Detailed Description