CN108827770A - It is a kind of suitable for the grouting test system of triaxial compression test and its application - Google Patents

Abstract

The invention relates to a grouting test system suitable for a triaxial compression test and its application, including a manual grouting device, a quick-connect grouting pipeline system, and a standard sample grouting device; the manual grouting device extracts cement slurry, and passes through The quick-connect grouting pipeline system pumps the grout with quantitative constant pressure to the standard sample grouting device to complete the test. Before the test, soil samples with different physical parameters can be selected and filled into the standard sample grouting device. During the test, different grouting pressures or flow rates can be manually controlled to realize indoor grouting simulation tests under various variables, and obtain a complete The samples after grouting can be directly used in triaxial compression experiments. The whole set of equipment of the grouting test system of the present invention is convenient to assemble and disassemble. The manual grouting device is used to realize the grouting function through the switch valve. Compared with the use of an air compressor, the grouting pressure and flow can be controlled very easily, and the cost is low. Easy to control.

Description

A grouting test system suitable for triaxial compression test and its application

technical field

The invention relates to a grouting test system suitable for a triaxial compression test and an application thereof, belonging to the technical field of construction engineering grouting.

Background technique

In recent years, as a highly specialized construction method, grouting technology has been widely used in the reinforcement of weak strata and in dealing with geological disasters such as water and mud inrush. However, due to the uncertainty of formation conditions and the complexity of grout properties, the current research on grouting theory lags far behind its engineering application requirements. Therefore, it is necessary to study the mechanical properties of grouting reinforcement before quantitatively evaluating the effect of grouting reinforcement on the stability of weak rock formations. Most of the existing grouting simulation test systems are inconvenient to connect, the equipment is bulky, and the pressure and flow rate of the grouting cannot be flexibly controlled. It is not easy to prepare a standard size sample for the triaxial compression test on the reinforced body after grouting.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a grouting test system suitable for triaxial compression tests, using the grouting test system to directly produce standard samples that meet the requirements of triaxial compression tests, which is convenient and quick.

The present invention also provides a method for using the above-mentioned grouting test system suitable for triaxial compression tests.

Technical scheme of the present invention is as follows:

A grouting test system suitable for triaxial compression tests, including sequentially connected manual grouting device, quick-connect grouting pipeline system and standard sample grouting device, wherein:

Manual grouting device, manually extracting cement slurry;

The quick-connect grouting pipeline system uses quick-connect male and female joints to communicate with the manual grouting device and the standard sample grouting device respectively;

The standard sample grouting device adopts a sample forming device that meets the standards of the triaxial compression test.

Preferably, the manual grouting device includes a bracket, a slurry storage tank and a manual metering pump arranged on the bracket, the input end of the manual metering pump is connected to the slurry storage tank through a grout suction pipe, and the output end of the manual metering pump is connected to the Rubber hose, one end of the pressure-bearing rubber hose is provided with a quick-plug male head.

Preferably, the quick-connect grouting pipeline system includes a ferrule four-way joint, and the four ports of the ferrule four-way joint are respectively connected to the quick-plug female joint, the pressure gauge, the first ferrule ball valve and the second ferrule ball valve, The second ferrule ball valve is connected to the grouting flower pipe through the straight-through terminal joint of the ferrule, wherein the quick-insert female joint is mated with the quick-inserted male head.

Preferably, the standard sample grouting device includes a sample cylinder, an upper platen and a lower base, the sample cylinder is placed between the upper platen and the lower base, the upper platen and the lower base are connected by studs, and the studs The bottom end is connected with the lower base through a rotating shaft, and the top of the stud penetrates through the upper platen and is tightened by a lock nut, and the upper platen is provided with a through hole for the grouting flower tube to penetrate.

Preferably, the upper pressing plate and the lower base are connected by three studs, and the three studs are evenly distributed on the same circumference.

Preferably, the lower bottom surface of the upper platen and the upper surface of the lower base are respectively provided with circular grooves, and the upper and lower ends of the sample cylinder are respectively placed in the circular grooves.

Preferably, the sample cylinder is spliced by three identical steel sheets and tightly tightened by an external hoop. The inner diameter of the sample cylinder is 61.8mm and the height is 125mm.

Preferably, the grouting flower tube is provided with a plurality of grouting holes, the through hole of the grouting flower tube is located in the sample cylinder, and the ferrule straight-through terminal joint is threadedly connected to the through hole.

A method for using a grouting test system suitable for triaxial compression tests, comprising the following steps:

(1) Assemble the standard sample grouting device: first, splicing three steel sheets into a sample cylinder, and wrapping the hoop around the outside of the steel sheet for tight sealing, and then placing the sample cylinder on the lower base , fill the pre-configured soil samples layer by layer in the sample cylinder, and finally cover the upper pressure plate, and tighten the lock nut, and lock the upper pressure plate on the sample cylinder;

(2) System connection: first insert the grouting flower tube of the quick-connect grouting pipeline system into the sample cylinder and tighten the ferrule straight-through terminal joint, and then connect the quick-plug male head of the manual grouting device to the quick-connect grouting Connect the quick-plug female connector of the pipeline system;

(3) Grouting: Put the configured slurry in the slurry storage tank, close the first ferrule ball valve for pressure relief, open the second ferrule ball valve, press the manual metering pump, and start grouting until the pressure on the pressure gauge When the value reaches the predetermined grouting pressure, the grouting is completed;

(4) After the grouting is finished, close the second ferrule ball valve, open the first ferrule ball valve for pressure relief, let the excess slurry flow out from the pressure relief overflow port of the first ferrule ball valve, and drain the grouting flower pipe from the Pull out the sample from the cylinder, disassemble the grouting sample device after the grouting body solidifies, and take out the solidified grouting sample.

Preferably, step (5) is also included, after the quick-connected grouting pipeline is removed from the grouting sample device, clean water is replaced in the grout storage barrel, and the pipeline and the grouting floral tube are flushed.

The beneficial effects of the present invention are:

1. The whole set of equipment of the grouting test system of the present invention is easy to assemble and disassemble. The manual grouting device is used to realize the grouting function through the switch valve. Compared with the use of air compressors, the grouting pressure and flow can be controlled very easily, and it will not be caused by The pressure is not well controlled and affects the accuracy of the test, and the cost is low and the control is convenient.

2. The sample cylinder in the present invention is easy to splice, and its size is: 61.8 mm in diameter and 125 mm in height, which is the size of a standard triaxial compression test sample, avoiding the need for sampling in the reinforced body after grouting During the process, the specimen after grouting can be directly subjected to standard triaxial compression test to obtain the mechanical parameters under different grouting parameters or different physical parameters of the soil.

3. The grouting pipe in the present invention is partly patterned by inserting the grouting device to ensure that the grout spreads evenly during the grouting process, achieves a better grouting reinforcement effect, and reduces the risk of test failure caused by pipeline blockage.

Description of drawings

Fig. 1 is the overall structural representation of grouting test system of the present invention;

Fig. 2 is the structural representation of manual grouting device among the present invention;

Fig. 3 is a schematic structural diagram of the quick-connect grouting pipeline system in the present invention;

Fig. 4 is a schematic structural diagram of a standard sample grouting device in the present invention.

In the figure: 1-manual grouting device; 2-quick connection grouting pipeline system; 3-standard sample grouting device; 4-support; 5-storage bucket; 6-suction pipe; 7-manual metering pump ;8-Pressure-bearing rubber hose; 9-Quick plug male head; 10-Quick plug female connector; 11-Card sleeve four-way joint; 12-First ferrule ball valve; 13-Pressure relief overflow port; 14-Second card Sleeve ball valve; 15- ferrule straight-through terminal joint; 16- grouting flower tube; 17- grouting hole; 18- pressure gauge; 19- upper platen; 20- sample cylinder; ; 23-screw; 24-rotating shaft; 25-lock nut.

Detailed ways

The present invention will be further described below through the embodiments and in conjunction with the accompanying drawings, but not limited thereto.

Example 1:

As shown in Figures 1 to 4, this embodiment provides a grouting test system suitable for triaxial compression tests, including a manual grouting device 1 connected in sequence, a quick-connect grouting pipeline system 2 and a standard sample injection system. The slurry device has three parts, including:

Manual grouting device 1, which manually extracts cement grout;

The quick-connect grouting pipeline system 2 is connected with the manual grouting device 1 and the standard sample grouting device 3 respectively by using quick-connect male and female joints;

The standard sample grouting device 3 adopts a sample forming device that meets the standards of the triaxial compression test.

Specifically, as shown in Figure 2, the manual grouting device 1 includes a bracket 4, a slurry storage bucket 5 arranged on the bracket, and a manual metering pump 7. 5 connection, the output end of the manual metering pump 7 is connected to the pressure-bearing rubber hose 8, and one end of the pressure-bearing rubber hose 8 is provided with a quick-plug male head 9. Support 4 is a four-legged support, and the top of the four-legged support is a platform, and the slurry storage barrel 5 is installed on the lower surface of the platform, and the manual metering pump 7 is installed on the upper top surface of the platform, and cement slurry is housed in the slurry storage barrel 5.

As shown in Figure 3, the quick-connect grouting pipeline system 2 includes a ferrule four-way joint 11, and the four ports of the ferrule four-way joint 11 are respectively connected to the quick-plug female joint 10, the pressure gauge 18, and the first ferrule ball valve 12 and the second ferrule ball valve 14, wherein the pressure gauge 18 is at the top, the quick-insert female joint 10 is on the right, the first ferrule ball valve 12 is on the left, and the second ferrule ball valve 14 is at the bottom; the second ferrule ball valve 14 passes through The ferrule straight-through terminal connector 15 is connected to the grouting floral tube 16, wherein the quick-plug female connector 10 is mated with the quick-plug male connector 9.

As shown in Figure 4, the standard sample grouting device 3 includes a sample cylinder 20, an upper platen 19 and a lower base 22, the sample cylinder 20 is placed between the upper platen 19 and the lower base 22, and the lower platen 19 The bottom surface and the upper surface of the lower base 22 are respectively provided with circular grooves, and the upper and lower ends of the sample cylinder 20 are respectively placed in the circular grooves. The upper platen 19 and the lower base 22 are connected by three studs 23, the three studs 23 are evenly distributed on the same circumference, the bottom ends of the studs 23 are connected with the lower base 22 through the rotating shaft 24, and the top ends of the studs 23 run through the back of the upper platen 19 Tighten by the locking nut 25, and the upper pressing plate 19 is provided with a through hole for the grouting flower tube 16 to penetrate, and the through hole is provided with an internal thread.

The sample cylinder 20 is spliced by three identical steel sheets, and is sealed and tightened by the outer hoop 21. The inner diameter of the sample cylinder is 61.8mm and the height is 125mm. Using the sample cylinder 20, a standard sample that meets the requirements of the triaxial compression test can be directly produced.

A plurality of grouting holes 17 are opened on the grouting flower tube 16, and the grouting holes 17 are distributed in a staggered manner. The through holes of the grouting flower tubes 16 are located in the sample cylinder 20 and the ferrule is directly connected to the terminal joint 15 and the threaded hole. Connected, the cement slurry enters the soil in the sample cylinder from the grouting hole 17, and the multiple grouting holes in the staggered distribution ensure that the grout spreads evenly during the grouting process, achieving a better grouting reinforcement effect and reducing the occurrence of pipelines. Risk of test failure due to clogging.

Example 2:

The method for using the grouting test system applicable to the triaxial compression test as described in Example 1 comprises the following steps:

(1) Assembling the standard sample grouting device: first, three steel sheets are spliced into a sample cylinder 20, and the hoop 21 is tightly placed outside the steel sheets for tight sealing, and then the sample cylinder 20 is placed in the On the lower base 22, fill the pre-configured soil samples layer by layer in the sample cylinder 20, and finally cover the upper pressing plate 19, and tighten the locking nut 25, and lock the upper pressing plate 19 on the sample cylinder 20 superior;

(2) System connection: First insert the grouting flower tube 16 of the quick-connect grouting pipeline system into the sample cylinder 20 and tighten the ferrule straight-through terminal connector 15, and then insert the quick-plug male head 9 of the manual grouting device Connect with the quick-plug female connector 10 of the quick-connect grouting pipeline system;

(3) Grouting: Put the configured cement slurry in the slurry storage tank 5, close the first ferrule ball valve 12 for pressure relief, open the second ferrule ball valve 14, press the manual metering pump 7, and start grouting. Until the numerical value on the pressure gauge 18 reaches the predetermined grouting pressure, the grouting is completed;

(4) After the grouting is finished, close the second ferrule ball valve 14, open the first ferrule ball valve 12 for pressure relief, let the excess slurry flow out from the pressure relief overflow port 13 of the first ferrule ball valve, and put the grouting The floral tube 16 is extracted from the sample cylinder 20, and the grouting sample device is disassembled after the grouting body is solidified, and the solidified grouting sample is taken out to obtain a standard grouting sample that can be directly subjected to a triaxial compression test.

(5) After the quick-connect grouting pipeline is removed from the grouting sample device, replace it with clean water in the grout storage tank 5, rinse the pipeline and the grouting flower tube, and use it later.

In the operation method of the grouting test system in this embodiment, soil samples with different physical parameters can be selected and filled into the standard sample grouting device before the test. During the test, different grouting pressures or flow rates can be manually controlled to achieve various Indoor grouting simulation test under variable conditions, and obtain complete standard grouting samples after grouting, which can be directly used in triaxial compression experiments.

Claims (10)

1. a kind of grouting test system suitable for triaxial compression test, which is characterized in that including sequentially connected manual slip casting Device connects grouting pipeline system and standard sample grouting device fastly, wherein：

Manual grouting device extracts cement grout using manual mode；

Connect grouting pipeline system fastly, using the pin and box sub that can quickly connect respectively with manual grouting device, standard sample slip casting Device connection；

Standard sample grouting device, using the sample forming device for meeting triaxial compression test standard.

2. grouting test system as described in claim 1, which is characterized in that the manual grouting device includes bracket and sets Slurry storing tank on bracket, manually-actuated metering pump are set, the input terminal of manually-actuated metering pump connect by pulp-absorbing pipe with slurry storing tank, manual meter The output end of amount pump connects pressure-bearing sebific duct, and one end of pressure-bearing sebific duct is provided with slotting male connector fastly.

3. grouting test system as claimed in claim 2, which is characterized in that the grouting pipeline system that connects fastly includes cutting ferrule four Pass joint, four ports of cutting ferrule four-way connection are separately connected slotting female connector, pressure gauge, the first cutting ferrule ball valve and the second cutting ferrule fastly Ball valve, the second cutting ferrule ball valve connect grouting tube by cutting ferrule directintermination connector, wherein slotting female connector is matched with fast male connector of inserting fastly Close connection.

4. grouting test system as claimed in claim 3, which is characterized in that the standard sample grouting device includes circular sample Cylinder, top board and lower bottom base, sample cylinder are placed between top board and lower bottom base, and top board and lower bottom base pass through Stud connection, The bottom end of stud is connect by shaft with lower bottom base, and the top of stud passes through locking nut screwing, top board after top board On be provided with the through-hole penetrated for grouting tube.

5. grouting test system as claimed in claim 4, which is characterized in that the top board and lower bottom base pass through three studs Connection, three studs are uniformly distributed on the same circumference.

6. grouting test system as claimed in claim 4, which is characterized in that the bottom surface of the top board and lower bottom base it is upper Surface offers circular groove respectively, and the upper and lower ends of sample cylinder are respectively placed in circular groove.

7. grouting test system as claimed in claim 4, which is characterized in that the sample cylinder is spelled by three pieces of identical steel discs It connects, and by external circular boop sealed banding, it is highly 125mm that the internal diameter of sample cylinder, which is 61.8mm,.

8. grouting test system as claimed in claim 4, which is characterized in that offer multiple pulps on the grouting tube Hole, grouting tube penetrate that through-hole is located in sample cylinder and cutting ferrule directintermination connector is connect with through hole whorl.

9. a kind of user of such as described in any item grouting test systems suitable for triaxial compression test of claim 1-8 Method includes the following steps：

(1) standard sample grouting device is assembled：Three pieces of steel discs are spliced into sample cylinder first, and circular boop is tightly placed in outside steel disc Face carries out banding sealing, and then sample cylinder is put on lower bottom base, and pre-configured soil is filled up in layering in sample cylinder Sample finally covers top board, and by locking nut screwing, top board is tightly locked on sample cylinder；

(2) system connects：First the grouting tube for connecing grouting pipeline system fastly is inserted into sample cylinder and tightens cutting ferrule and is led directly to Terminal fitting, then the fast slotting male connector of manual grouting device is connected with the fast female connector of inserting for connecing grouting pipeline system fastly；

(3) slip casting：Configured slurries are placed in slurry storing tank, the first cutting ferrule ball valve of pressure release is closed, open the second cutting ferrule ball Valve presses manually-actuated metering pump, starts slip casting, until the numerical value on pressure gauge reaches scheduled grouting pressure, completion slip casting；

(4) after slip casting, the second cutting ferrule ball valve is closed, opens the first cutting ferrule ball valve of pressure release, allows extra slurries from the The pressure release overflow port of one cutting ferrule ball valve flows out, and grouting tube is extracted out from sample cylinder, dismantles slip casting after injecting cement paste solidification Sample devices, the slip casting sample after taking out solidification.

10. the application method of grouting test system as claimed in claim 9, which is characterized in that further include step (5), wait incite somebody to action It is connect after grouting pipeline removes from slip casting Sample devices fastly, clear water, flushing pipeline and grouting tube is changed in slurry storing tank.