CN216765894U - Grouting device capable of accurately controlling pressure and pressure regulating valve - Google Patents

Abstract

The utility model provides a grouting device and a pressure regulating valve for accurately controlling pressure, which comprise a grouting pump, a pressure regulating valve, a flow sensor and a pressure sensor, wherein the grouting pump is connected with the pressure regulating valve; the outlet of the grouting pump is connected with a pressure regulating valve, the pressure regulating valve is connected with a flow regulating valve through a pipeline, and the pipeline is also provided with a flow sensor and a pressure sensor; the structure of the pressure regulating valve is as follows: the interior of the valve body is divided into a spring cavity and a pressure cavity, a rod of the pressure adjusting handle is in threaded connection with a pressure nut, the pressure nut is in threaded connection with the spring cavity of the valve body, one end of a valve core at one end of the valve rod is fixedly connected, and a pressure spring is arranged between the valve rod and the rod of the pressure adjusting handle; the other end of the valve core is positioned in the fluid cavity, the pressure cavity is provided with a backflow port, one end of the fluid cavity is provided with a liquid inlet, and the other end of the fluid cavity is provided with a liquid outlet. Through adopting pressure regulating valve, cooperation flow control valve, flow sensor and pressure sensor, regulation slip casting pressure that can be convenient and accurate.

Description

Grouting device capable of accurately controlling pressure and pressure regulating valve

Technical Field

The utility model relates to the field of slope anchoring construction, in particular to a grouting device and a pressure regulating valve for accurately controlling pressure.

Background

The geological structure of a certain road side slope is as follows: powdery clay on the surface layer; the upper layer of strongly weathered sandstone and mudstone interbeddes are extremely broken into soft rocks; the lower layer is provided with a weathered sandstone-mudstone interbed layer, the sandstone is harder, the mudstone is softer, the mudstone is easy to soften after being soaked in water and easy to crack after being dried, and the rock mass is broken and is soft rock. The mudstone is easy to soften when immersed in water, the shear strength is rapidly reduced, and the slope is easy to deform and collapse along the weak layer. Therefore, bedrock fracture water is stable on the slope during rainfall. And the height difference from the top of the slope to the bottom of the slope reaches 77 meters. Due to extremely poor geological conditions, the surface layer of the side slope is easy to destabilize, the whole instability of the side slope is easy to cause in the excavation construction process, the instability of the side slope is easy to cause by the well blasting of the slide-resistant pile, the height of the side slope is high, large construction equipment is difficult to enter the field, especially the large slide-resistant pile construction equipment is difficult to erect, and the difficulty of site construction is extremely high. In the frame beam constructed, the slipping accident of the prestressed anchor cable occurs in the anchoring measure, and the anchoring force of the anchoring measure in the existing construction method, such as the prestressed anchor cable described in the Chinese patent document 201610186909.X and the foundation pit supporting prestressed anchor cable construction method, is insufficient through analysis. And if a high-pressure grouting anchoring technology is adopted, the rock mass can be greatly damaged, and artificial landslide is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a grouting device and a pressure regulating valve for accurately controlling pressure, which can strengthen the anchoring force of a prestressed grouting anchor cable and facilitate high-pressure grouting construction; in the preferred scheme, can be convenient control grouting pressure, avoid excessively destroying rock mass structure, can form multistage to the fracturing coagulation body of radial diffusion, improve anchor antiskid effect by a wide margin.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: a grouting device capable of accurately controlling pressure comprises a grouting pump, a pressure regulating valve, a flow sensor and a pressure sensor;

the outlet of the grouting pump is connected with a pressure regulating valve, the pressure regulating valve is connected with a flow regulating valve through a pipeline, and the pipeline is also provided with a flow sensor and a pressure sensor;

the structure of the pressure regulating valve is as follows: the valve body is internally divided into a spring cavity and a pressure cavity, a rod of the pressure adjusting handle is in threaded connection with a pressure nut, the pressure nut is in threaded connection with the spring cavity of the valve body, one end of a valve rod is fixedly connected with one end of a valve core positioned in the pressure cavity, the other end of the valve rod penetrates into the spring cavity in a sealing manner, a sealing ring is arranged at the position where the valve rod penetrates through the spring cavity, and a pressure spring is arranged between the valve rod and the rod of the pressure adjusting handle;

the other end of the valve core forms a seal with the fluid cavity, the pressure cavity is provided with a backflow port, one end of the fluid cavity is provided with a liquid inlet, the liquid inlet is used for being connected with an outlet of the grouting pump, and the other end of the fluid cavity is provided with a liquid outlet.

In the preferred scheme, the tail end of the pipeline is divided into two branches, a valve is arranged on each branch, the first branch is connected with a grouting pipe of the prestress grouting anchor cable through a grouting connector, and the second branch is connected with the anchor hole.

In the preferred scheme, still be equipped with the agitator tank, the import and the agitator tank of slip casting pump are connected, and pressure regulating valve's backward flow mouth is connected with the agitator tank.

In a preferred scheme, the stirring tank is positioned at the high position of the inlet of the grouting pump.

In the preferred scheme, the position that the slip casting pipe is close to the afterbody end be equipped with pipe middle section and pipe head section in proper order, be equipped with the side opening in pipe middle section, be equipped with the end hole in pipe head section, the internal diameter of slip casting pipe is greater than the internal diameter in pipe middle section, the internal diameter in pipe middle section is greater than the internal diameter in pipe head section, when putting into the steel ball of different diameters, can block off pipe head section and pipe middle section respectively.

In the preferable scheme, in the prestress grouting anchor cable, the grouting pipe is positioned in the middle, and the steel wire rope is positioned at the periphery.

In a preferred embodiment, the flow sensor is an electromagnetic flow meter.

In a preferred scheme, the grouting pump is a multi-cylinder fixed-frequency grouting pump.

A pressure regulating valve is characterized in that a valve body is internally divided into a spring cavity and a pressure cavity, a rod of a pressure regulating handle is in threaded connection with a pressure nut, the pressure nut is in threaded connection with the spring cavity of the valve body, one end of a valve rod is fixedly connected with one end of a valve core positioned in the pressure cavity, the other end of the valve rod penetrates into the spring cavity in a sealing manner, a sealing ring is arranged at the position where the valve rod penetrates through the spring cavity, and a pressure spring is arranged between the valve rod and the rod of the pressure regulating handle;

the other end of the valve core and the fluid cavity form sealing, the pressure cavity is provided with a backflow port, one end of the fluid cavity is provided with a liquid inlet, the liquid inlet is used for being connected with an outlet of the grouting pump, and the other end of the fluid cavity is provided with a liquid outlet.

In a preferable scheme, the valve body is made of high manganese steel, tungsten carbide materials or chromium carbide materials.

According to the grouting device and the pressure regulating valve for accurately controlling the pressure, the grouting pressure can be conveniently and accurately regulated by adopting the pressure regulating valve and matching with the flow regulating valve, the flow sensor and the pressure sensor.

Drawings

The utility model is further illustrated with reference to the following figures and examples:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the pressure regulating valve of the present invention.

Fig. 3 is a schematic structural view of the prestressed grouting anchor cable of the present invention.

Fig. 4 is a schematic cross-sectional view of the prestressed grouting anchor cable of the present invention.

Fig. 5 is an enlarged view of a portion of the end of the grouting pipe according to the present invention.

In the figure: a stirring tank 1; an anchor eye 2; an anchor portion 3; an anchor base 31; a backing plate 32; an anchor portion 33; a grouting pump 4; grouting anchor cable 5 in prestress; a frac condensate 51; a sealing portion 52; a grouting pipe 53; a head section 531; a first steel ball 532; a mid-tube section 533; a side hole 534; a second steel ball 535; a wire rope 54; a lower plug 55; an upper plug 56; a pressure regulating valve 6; a pressure adjustment handle 61; a pressure nut 62; a pressure spring 63; a spring cavity 64; a valve body 65; a seal ring 66; a valve stem 67; a pressure chamber 68; a valve core 69; a fluid chamber 60; a liquid inlet 601; a return port 602; a liquid outlet 603; a flow sensor 7; a pressure sensor 8; a flow rate regulating valve 9; a first branch 10; a first valve 11; a second branch 12; a second valve 13; a motor 14; and (4) grouting joints 15.

Detailed Description

Example 1:

as shown in fig. 1, a grouting apparatus for precisely controlling pressure includes a grouting pump 4, a pressure regulating valve 6, a flow regulating valve 9, a flow sensor 7 and a pressure sensor 8;

the outlet of the grouting pump 4 is connected with a pressure regulating valve 6, the pressure regulating valve 6 is connected with a flow regulating valve 9 through a pipeline, and a flow sensor 7 and a pressure sensor 8 are also arranged on the pipeline; by the structure, accurate grouting pressure control is realized, and through tests, compared with a variable-frequency grouting pressure control scheme, the pressure fluctuation of the three-cylinder variable-frequency grouting pressure control scheme is maximally +/-30% when the rotating speed is lowest, and the pressure fluctuation is maximally +/-3% by adopting the scheme of the utility model and is greatly lower than that of the variable-frequency grouting pressure control scheme. Thereby can avoid the rock mass to excessively destroy when realizing rock mass fracturing. As shown in fig. 3, the present example employs a structure in which a grouting pipe 53 is located in the middle of a wire rope 54.

As shown in fig. 2, the pressure regulating valve 6 has a structure in which: the interior of the valve body 65 is divided into a spring cavity 64 and a pressure cavity 68, the rod of the pressure adjusting handle 61 is in threaded connection with the pressure nut 62, the pressure nut 62 is in threaded connection with the spring cavity 64 of the valve body 65, one end of the valve rod 67 is fixedly connected with one end of a valve core 69 positioned in the pressure cavity 68, the other end of the valve rod 67 penetrates into the spring cavity 64 in a sealing manner, a sealing ring 66 is arranged at the position where the valve rod 67 penetrates through the spring cavity 64, and a pressure spring 63 is arranged between the valve rod 67 and the rod of the pressure adjusting handle 61;

the other end of the valve core 69 forms a seal with the fluid cavity 60, the pressure cavity 68 is provided with a return port 602, one end of the fluid cavity 60 is provided with a fluid inlet 601, the fluid inlet 601 is used for connecting with an outlet of the grouting pump 4, and the other end is provided with a fluid outlet 603. With this structure, the pressure between the spool 69 and the fluid chamber 60 can be adjusted by the handle connected to the valve stem 67; when the pressure in the fluid chamber 60 is greater than the pressure of the pressure spring 63, the valve core 69 is lifted, and a part of mortar flows out from the return port 602. Thereby achieving accurate regulation of the grouting pressure. And the precise regulation of the mortar flow and the pressure can be realized by matching with the flow regulating valve 9. The accurate control of the pressure and flow of the concrete mortar has always been a very difficult technical problem. Related products are not seen in the prior art, in order to solve the problem, the pressure regulating valve 6 meeting the requirement is redesigned and manufactured, the accurate pressure control of the concrete mortar can be met, and the pressure fluctuation of the pressure regulating valve 6 is within +/-3% at most according to the feedback of a pressure sensor.

In a preferred scheme, as shown in fig. 1, the end of the pipeline is divided into two branches, each branch is provided with a valve, the first branch 10 is connected with a grouting pipe 53 of a prestressed grouting anchor cable 5 through a grouting joint 15, and the second branch 12 is connected with an anchor hole 2. By the structure, the pipe orifice is prevented from being frequently replaced, and the operation is convenient. And when the failure condition of the plugging part 52 occurs, grouting plugging can be performed in real time.

Preferably, as shown in fig. 1, a stirring tank 1 is further provided, an inlet of the grouting pump 4 is connected to the stirring tank 1, and a return port 602 of the pressure regulating valve 6 is connected to the stirring tank 1.

The preferred embodiment is shown in fig. 1, wherein the stirring tank 1 is located at the high position of the inlet of the grouting pump 4.

In a preferred scheme, as shown in fig. 5, a middle pipe section 533 and a head pipe section 531 are sequentially arranged at a position of the grouting pipe 53 close to the tail end, a side hole 534 is arranged at the middle pipe section 533, an end hole is arranged at the head pipe section 531, the inner diameter of the grouting pipe 53 is larger than that of the middle pipe section 533, the inner diameter of the middle pipe section 533 is larger than that of the head pipe section 531, and when steel balls with different diameters are put in, the head pipe section 531 and the middle pipe section 533 can be respectively blocked. By means of the structure, the fracturing coagulator 51 with large diameter is formed in the argillaceous sandstone area conveniently in a time-sharing grouting mode, and anchoring force is greatly improved. And the scheme of accurately controlling the pressure and the flow can avoid the damage of the rock mass.

In the preferred embodiment shown in fig. 3, the pre-stressed grouting anchor cable 5 has a grouting pipe 53 in the middle and a steel cable 54 at the periphery.

In a preferred embodiment, the flow sensor 7 is an electromagnetic flow meter.

In a preferred scheme, the grouting pump 4 is a multi-cylinder fixed-frequency grouting pump.

In a preferred scheme, the valve body 65 and the valve core 69 are made of high manganese steel (ZGMn13), tungsten carbide material (WCSP) or chromium carbide material (Cr2C3+ Q235). According to the scheme, the service life of the flow regulating valve 9 is prolonged.

In use, as shown in fig. 3, a construction method using the grouting device for precisely controlling pressure includes the following steps:

s1, drilling anchor holes 2 on the slope; during drilling, staggered construction is required;

s2, the prestressed grouting anchor cable 5 is lowered into the anchor hole 2, and the plugging part 52 is constructed at a position close to the hole opening in the anchor hole 2;

in a preferred embodiment, the construction method for constructing the plugging portion 52 includes: binding a lower plug 55 in the middle of the prestressed grouting anchor cable 5, and then binding a pipeline connected with the second branch 12;

after the prestressed grouting anchor cable 5 is laid down, an upper plug 56 is arranged at a position close to the orifice; the lower plug 55 and the upper plug 56 are rubber plugs or hemp plugs.

And after checking, starting the grouting pump 4, and injecting the expansion mortar from the second branch 12. The expansion mortar is a commercially available product, for example, an expansion mortar described in chinese patent document CN 108164225A. The plugging portion 52 is arranged to prevent slurry leakage during fracturing grouting.

S3, connecting the grouting pipe 53 of the prestressed grouting anchor cable 5 with the grouting joint 15 of the grouting device for accurately controlling the pressure; the grouting joint 15 in this example is a high-pressure movable joint.

S4, grouting the grout pipe 53 by the grouting pump 4 under the pressure exceeding the fracturing pressure, and forming a fracturing condensate 51 at the tail end of the grouting pipe 53 after the grout is condensed;

in the preferred scheme, before grouting, obtaining the fracturing pressure parameters of the rock mass through a fracturing experiment, the concrete scheme is that a complete rock core with a target depth is taken, a grouting pipe is embedded after drilling, then the rock core is buried in concrete, drain holes are formed in the periphery of the rock core, after the concrete is solidified, a limited fracturing experiment is carried out, water is injected into the grouting pipe, the pressure value fed back by a pressure sensor is observed until loss of pressure, and the highest pressure before loss of pressure is the fracturing pressure parameters of the rock mass.

Controlling the grouting pressure to be 120-150% of the fracturing pressure, injecting delayed coagulation mortar during grouting to enlarge the permeation range of the mortar, maintaining the pressure for a period of time, usually 5-10 min, keeping the pressure loss within a set range, usually not less than 30%, and then continuing injecting the delayed coagulation mortar; after reaching the preset amount, injecting quick setting mortar to seal the hole;

the pressure maintaining operation steps of the grouting device for accurately controlling the pressure are as follows: the pressure of the pressure regulating valve 6 is kept unchanged, and the flow regulating valve 9 is regulated to ensure that the flow sensor 7 has no reading from large to small. The flow sensor 7 in this example is an electromagnetic flow sensor, and the lowest starting flow is 1.5L/min.

And (3) maintaining the pressure for a period of time, if the pressure loss exceeds a preset value, namely the pressure loss is more than 30%, continuing to inject the delayed setting mortar, waiting for a period of time after reaching a preset amount, for example, 36H, constructing other prestressed grouting anchor cables 5 in the period of time, re-injecting the delayed setting mortar before the final setting time of the anchor hole 2, maintaining the pressure for a period of time, and then injecting the quick setting mortar for hole sealing.

During grouting construction, staggered construction is required to avoid mutual interference of adjacent anchor holes 2.

In the preferred scheme, after pressure maintaining, before the delayed coagulation mortar is continuously injected, the grouting joint 15 is taken down, the first steel ball 532 is placed in the grouting pipe 53, and the grouting joint 15 is installed and then grouting is continuously performed; at the moment, grouting is carried out to form radial diffused permeating slurry;

after grouting for a period of time, taking down the grouting joint 15, putting a second steel ball 535 in the grouting pipe 53, and continuing grouting after installing the grouting joint 15; at the moment, grouting is carried out to form another level of radially diffused penetrating slurry;

after the osmotic slurry is solidified, a multi-stage radially-diffused fracture condensate 51 is obtained. Because the pressure can be accurately controlled, the landslide caused by the disturbance of the construction to the rock mass is avoided.

Fixedly connecting the prestressed grouting anchor cable 5 with the anchoring part 3; namely, the anchoring construction of the prestressed grouting anchor cable 5 is realized.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The scope of the present invention is defined by the claims, and is intended to include equivalents of the features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.

Claims (10)

1. A grouting device capable of accurately controlling pressure is characterized in that: comprises a grouting pump (4), a pressure regulating valve (6), a flow regulating valve (9), a flow sensor (7) and a pressure sensor (8);

the outlet of the grouting pump (4) is connected with a pressure regulating valve (6), the pressure regulating valve (6) is connected with a flow regulating valve (9) through a pipeline, and a flow sensor (7) and a pressure sensor (8) are also arranged on the pipeline;

the structure of the pressure regulating valve (6) is as follows: the valve body (65) is internally divided into a spring cavity (64) and a pressure cavity (68), a rod of the pressure adjusting handle (61) is in threaded connection with a pressure nut (62), the pressure nut (62) is in threaded connection with the spring cavity (64) of the valve body (65), one end of a valve rod (67) is fixedly connected with one end of a valve core (69) positioned in the pressure cavity (68), the other end of the valve rod (67) penetrates into the spring cavity (64) in a sealing manner, a sealing ring (66) is arranged at the position where the valve rod (67) penetrates through the spring cavity (64), and a pressure spring (63) is arranged between the valve rod (67) and the rod of the pressure adjusting handle (61);

the other end of the valve core (69) forms a seal with the fluid cavity (60), the pressure cavity (68) is provided with a return port (602), one end of the fluid cavity (60) is provided with a liquid inlet (601), the liquid inlet (601) is used for being connected with an outlet of the grouting pump (4), and the other end of the fluid cavity is provided with a liquid outlet (603).

2. The grouting apparatus for precisely controlling pressure according to claim 1, wherein: the pipeline end divide into two branches, be equipped with the valve on every branch road, first branch road (10) are connected with slip casting pipe (53) of prestressing force slip casting anchor rope (5) through slip casting joint (15), second branch road (12) are connected with anchor eye (2).

3. The grouting apparatus for precisely controlling pressure according to claim 2, wherein: still be equipped with agitator tank (1), the import and the agitator tank (1) of grouting pump (4) are connected, and return opening (602) and agitator tank (1) of pressure regulating valve (6) are connected.

4. A pressure-precise control grouting apparatus according to claim 3, characterized in that: the stirring tank (1) is positioned at the high position of the inlet of the grouting pump (4).

5. The grouting apparatus for precisely controlling pressure according to claim 2, wherein: the position that slip casting pipe (53) are close to the afterbody end be equipped with pipe middle section (533) and pipe head section (531) in proper order, be equipped with side opening (534) in pipe middle section (533), be equipped with the end hole in pipe head section (531), the internal diameter of slip casting pipe (53) is greater than the internal diameter of pipe middle section (533), the internal diameter of pipe middle section (533) is greater than the internal diameter of pipe head section (531), when putting into the steel ball of different diameters, can shutoff pipe head section (531) and pipe middle section (533) respectively.

6. The grouting apparatus for precisely controlling pressure according to claim 5, wherein: in the prestress grouting anchor cable (5), a grouting pipe (53) is positioned in the middle, and a steel wire rope (54) is positioned at the periphery.

7. The grouting apparatus for precisely controlling pressure according to claim 1, wherein: the flow sensor (7) is an electromagnetic flowmeter.

8. The grouting apparatus for precisely controlling pressure according to claim 1, wherein: the grouting pump (4) is a multi-cylinder fixed-frequency grouting pump.

9. A pressure regulating valve is characterized in that: the interior of the valve body (65) is divided into a spring cavity (64) and a pressure cavity (68), a rod of a pressure adjusting handle (61) is in threaded connection with a pressure nut (62), the pressure nut (62) is in threaded connection with the spring cavity (64) of the valve body (65), one end of a valve rod (67) is fixedly connected with one end of a valve core (69) positioned in the pressure cavity (68), the other end of the valve rod (67) penetrates into the spring cavity (64) in a sealing mode, a sealing ring (66) is arranged at the position, where the valve rod (67) penetrates through the spring cavity (64), and a pressure spring (63) is arranged between the valve rod (67) and a rod of the pressure adjusting handle (61);

the other end of the valve core (69) forms a seal with the fluid cavity (60), the pressure cavity (68) is provided with a return port (602), one end of the fluid cavity (60) is provided with a liquid inlet (601), the liquid inlet (601) is used for being connected with an outlet of the grouting pump (4), and the other end of the fluid cavity is provided with a liquid outlet (603).

10. A pressure regulating valve (6) as claimed in claim 9, characterized in that: the valve body (65) is made of high manganese steel ZGMn13, tungsten carbide material WCSP or chromium carbide material Cr2C3+ Q235.

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