CN114232653A - Fracturing grouting anchoring and grading construction device and method - Google Patents
Fracturing grouting anchoring and grading construction device and method Download PDFInfo
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- CN114232653A CN114232653A CN202111501776.8A CN202111501776A CN114232653A CN 114232653 A CN114232653 A CN 114232653A CN 202111501776 A CN202111501776 A CN 202111501776A CN 114232653 A CN114232653 A CN 114232653A
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- 238000010276 construction Methods 0.000 title claims abstract description 52
- 238000004873 anchoring Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 39
- 239000011435 rock Substances 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 32
- 230000003111 delayed effect Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 230000015271 coagulation Effects 0.000 claims description 11
- 238000005345 coagulation Methods 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 238000007569 slipcasting Methods 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a fracturing grouting anchoring construction device and a method and a construction method thereof, wherein the fracturing grouting anchoring construction device 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 pipeline is connected with a grouting pipe of the prestress grouting anchor cable through a grouting joint. By adopting fracturing grouting and the scheme of accurately controlling grouting pressure, the fracturing concretion with the preset shape can be obtained in the rock mass, the anchoring force of the prestressed grouting anchor cable is greatly improved on the premise of less damage to the rock mass, and the problem of insufficient anchoring force of the prestressed anchor cable of the existing strongly weathered mudstone side slope is solved. The pressure regulating valve is matched with the flow regulating valve, the flow sensor and the pressure sensor, so that the grouting pressure can be conveniently and accurately regulated.
Description
Technical Field
The invention relates to the field of slope anchoring construction, in particular to a fracturing grouting anchoring construction device and a construction method.
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. Patent document CN104895072B describes a prestressed anchor cable and a forming construction method, in which a plurality of grouting pipes are provided to facilitate grouting, but the anchor cable is likely to be unevenly stressed or have a larger cross section.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fracturing grouting anchoring construction device and a construction method, 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 invention is as follows: a fracturing grouting anchoring construction device 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 pipeline is connected with a grouting pipe of the prestress grouting anchor cable through a grouting joint.
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 a preferred scheme, 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, 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 is equipped with pipe middle section and pipe head section in proper order, is equipped with the side opening in pipe middle section, is equipped with the end hole in pipe head section, and the internal diameter of slip casting pipe is greater than the internal diameter in pipe middle section, and 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.
A construction method adopting the fracturing grouting anchoring construction device comprises the following steps:
s1, drilling anchor holes on the slope;
s2, placing the prestressed grouting anchor cable into the anchor hole, and constructing a plugging part at a position close to the orifice in the anchor hole;
s3, connecting a grouting pipe of the prestress grouting anchor cable with a grouting joint of the fracturing grouting anchoring construction device;
s4, grouting by a grouting pump into the grouting pipe at a pressure exceeding the fracturing pressure, and forming a fracturing condensate at the tail end of the grouting pipe after the slurry is condensed;
s5, fixedly connecting the prestress grouting anchor cable with the anchoring part;
the anchoring construction of the prestressed grouting anchor cable is realized through the steps.
In a preferred embodiment, in step S2, the method of constructing the plugging portion includes: binding a lower plug at the middle part of the prestressed grouting anchor cable, and then binding a pipeline connected with the second branch;
after the prestressed grouting anchor cable is laid down, an upper plug is arranged at a position close to the orifice;
and after the inspection is correct, starting an injection pump, and injecting expansion mortar from the second branch.
In the preferred scheme, in step S4, firstly, fracturing pressure parameters of a rock body are obtained through a fracturing experiment, grouting pressure is controlled to be 120-150% of the fracturing pressure, during grouting, delayed coagulation mortar is firstly injected, pressure is maintained for a period of time, pressure loss is within a set range, and then delayed coagulation mortar can be continuously injected;
after reaching the preset amount, injecting quick setting mortar to seal the hole;
and (3) maintaining the pressure for a period of time, if the pressure loss exceeds a preset value, continuing to inject the delayed setting mortar, waiting for a period of time after reaching a preset amount, re-injecting the delayed setting mortar before the final setting time, maintaining the pressure for a period of time, and then injecting the quick setting mortar for hole sealing.
In the preferred scheme, after pressure maintaining, before the delayed coagulation mortar is continuously injected, the grouting joint is taken down, the first steel ball is placed in the grouting pipe, and grouting is continuously performed after the grouting joint is installed;
after grouting for a period of time, taking down the grouting joint, placing a second steel ball in the grouting pipe, installing the grouting joint, and continuing grouting;
and obtaining the fracturing concretes diffused to the radial direction in multiple stages through the steps.
According to the fracturing grouting anchoring construction device and the construction method provided by the invention, by adopting a scheme of fracturing grouting and accurately controlling grouting pressure, a fracturing concretion body with a preset shape can be obtained in a rock body, the anchoring force of the prestressed grouting anchor cable is greatly improved on the premise of less damage to the rock body, and the problem of insufficient anchoring force of the existing prestressed anchor cable for the strongly weathered mudstone side slope is solved. The pressure regulating valve is matched with the flow regulating valve, the flow sensor and the pressure sensor, so that the grouting pressure can be conveniently and accurately regulated.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of the prestressed grouting anchor cable of the present invention.
Fig. 3 is a schematic cross-sectional view of the prestressed grouting anchor cable of the present invention.
Fig. 4 is an enlarged view of a portion of the end of the grouting pipe in the present invention.
Fig. 5 is a schematic structural view of the pressure regulating valve of 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 pipe 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 fracturing grouting anchoring construction device 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 pipeline is connected with a grouting pipe 53 of the prestress grouting anchor cable 5 through a grouting joint 15. 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 invention 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.
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. With the structure, the frequent replacement of the pipe orifice is avoided, and the operation is convenient. And when the failure condition of the plugging part 52 occurs, grouting plugging can be performed in real time.
In a preferred embodiment, as shown in fig. 5, the pressure regulating valve 6 has a structure: 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.
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 agitator tank 1 is located at a high level at the inlet of the grouting pump 4. With the structure, the slurry feeding is convenient.
In a preferred scheme, as shown in fig. 4, 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 the structure, the fracturing coagulation body 51 with larger diameter is conveniently formed in the argillaceous sandstone area in a time-sharing grouting mode, and the anchoring force is greatly improved. And the scheme of accurately controlling the pressure and the flow can avoid the damage of the rock mass.
Example 2:
a construction method adopting the fracturing grouting anchoring construction device comprises 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 fracturing grouting anchoring construction device; 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 fracturing grouting anchoring construction device 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;
the fracturing coagulum 51 of multiple stages diffusing radially is obtained by the above steps.
S5, fixedly connecting the prestress grouting anchor cable 5 with the anchoring part 3;
the anchoring construction of the prestressed grouting anchor cable 5 is realized through the steps.
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 protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a fracturing grout anchor construction equipment which characterized by: 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 pipeline is connected with a grouting pipe (53) of the prestress grouting anchor cable (5) through a grouting joint (15).
2. The fracturing grouting anchoring construction device 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 fracturing grouting anchoring construction device according to claim 1, wherein: 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).
4. The fracturing grouting anchoring construction device according to claim 3, 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.
5. The fracturing grouting anchoring construction device according to claim 4, wherein: the stirring tank (1) is positioned at the high position of the inlet of the grouting pump (4).
6. The fracturing grouting anchoring construction device according to claim 1, wherein: the position that slip casting pipe (53) are close to the afterbody end is equipped with pipe middle section (533) and pipe head section (531) in proper order, is equipped with side opening (534) in pipe middle section (533), is equipped with the end hole in pipe head section (531), and the internal diameter of slip casting pipe (53) is greater than the internal diameter of pipe middle section (533), and 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 block off pipe head section (531) and pipe middle section (533) respectively.
7. A construction method using the fracturing grouting anchoring construction device as claimed in any one of claims 1 to 6, characterized by comprising the steps of:
s1, drilling anchor holes (2) on the slope;
s2, the prestressed grouting anchor cable (5) is lowered into the anchor hole (2), and a plugging part (52) is constructed at a position close to the hole opening in the anchor hole (2);
s3, connecting a grouting pipe (53) of the prestress grouting anchor cable (5) with a grouting joint (15) of the fracturing grouting anchoring construction device;
s4, grouting the grout pipe (53) by the grouting pump (4) at a 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;
s5, fixedly connecting the prestress grouting anchor cable (5) with the anchoring part (3);
the anchoring construction of the prestress grouting anchor cable (5) is realized through the steps.
8. The construction method of the fracturing grouting anchoring construction device according to claim 7, wherein: in step S2, the construction method for constructing the plugging section (52) is as follows: 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;
and after the inspection is correct, starting an injection pump (4) and injecting expansion mortar from the second branch (12).
9. The construction method of the fracturing grouting anchoring construction device according to claim 7, wherein: in the step S4, obtaining a fracturing pressure parameter of a rock body through a fracturing experiment, controlling the grouting pressure to be 120-150% of the fracturing pressure, injecting delayed coagulation mortar during grouting, maintaining the pressure for a period of time, and continuously injecting the delayed coagulation mortar when the pressure loss is within a set range;
after reaching the preset amount, injecting quick setting mortar to seal the hole;
and (3) maintaining the pressure for a period of time, if the pressure loss exceeds a preset value, continuing to inject the delayed setting mortar, waiting for a period of time after reaching a preset amount, re-injecting the delayed setting mortar before the final setting time, maintaining the pressure for a period of time, and then injecting the quick setting mortar for hole sealing.
10. The construction method of the fracturing grouting anchoring construction device according to claim 9, wherein: after pressure maintaining, before the delayed coagulation mortar is continuously injected, taking down the grouting joint (15), putting a first steel ball (532) into the grouting pipe (53), installing the grouting joint (15), and then continuously injecting the mortar;
after grouting for a period of time, taking down the grouting joint (15), putting a second steel ball (535) into the grouting pipe (53), and continuing grouting after installing the grouting joint (15);
through the steps, fracturing concretes (51) which are diffused to radial directions in multiple stages are obtained.
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| CN202111501776.8A CN114232653B (en) | 2021-12-09 | 2021-12-09 | Fracturing grouting anchoring grading construction device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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