CN114232653B - Fracturing grouting anchoring grading construction device and method - Google Patents
Fracturing grouting anchoring grading construction device and method Download PDFInfo
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- CN114232653B CN114232653B CN202111501776.8A CN202111501776A CN114232653B CN 114232653 B CN114232653 B CN 114232653B CN 202111501776 A CN202111501776 A CN 202111501776A CN 114232653 B CN114232653 B CN 114232653B
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- 238000010276 construction Methods 0.000 title claims abstract description 56
- 238000004873 anchoring Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 46
- 239000011435 rock Substances 0.000 claims abstract description 23
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 10
- 230000000979 retarding effect Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000011440 grout Substances 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
- 238000007569 slipcasting Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 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
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 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
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying 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
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The application provides a fracturing grouting anchoring construction device, a fracturing grouting anchoring construction method and a fracturing grouting anchoring construction method, 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 a flow sensor and a pressure sensor are also arranged on the pipeline; the pipeline is connected with a grouting pipe of the prestressed grouting anchor cable through a grouting joint. By adopting the scheme of fracturing grouting and precisely controlling grouting pressure, the fracturing coagulum with a 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 existing prestressed anchor cable for the strongly weathered mudstone slope is solved. The pressure regulating valve is matched with the flow regulating valve, the flow sensor and the pressure sensor, so that grouting pressure can be conveniently and accurately regulated.
Description
Technical Field
The application 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 highway slope is as follows: surface layer powdery clay; the sandstone mud rock interbedded on the upper layer is broken to be soft rock; the lower layer is used for converting sandstone mud rock into a mutual layer, the sandstone is harder, the mud rock is softer, the mud rock is easy to soften after soaking in water, the mud rock is easy to crack after drying, and the rock mass is broken, so that the mud rock is soft. The mudstone is easy to soften when immersed in water, the shear strength is rapidly reduced, and the slope is extremely easy to deform and collapse along the soft layer. Thus, the bedrock fracture water is stable to the side slope during rainfall. And the height difference from the top of the slope to the bottom of the slope reaches 77 meters. Because the geological condition is extremely poor, the whole instability of the side slope is easily caused in the excavation construction process, the instability of the side slope is easily caused by the well-formed blasting of the slide-resistant pile, the height of the side slope is higher, large-scale construction equipment is difficult to enter the ground, and especially, the large-scale slide-resistant pile construction equipment is difficult to erect and has extremely high field construction difficulty. The pre-stressed anchor cable slipping accident occurs in the anchoring measures of the constructed frame beam, and the existing construction method is analyzed, for example, the anchoring force of the anchoring measures in the pre-stressed anchor cable and foundation pit supporting pre-stressed anchor cable construction method described in China patent document 201610186909.X is insufficient. Patent document CN104895072B describes a prestressed anchor cable and a molding method, and describes a primary grouting pipe and a secondary grouting pipe, and a plurality of grouting pipes are provided to facilitate grouting, but the anchor cable is liable to be stressed unevenly or has a larger cross section.
Disclosure of Invention
The technical problem to be solved by the application is to provide 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, grouting pressure can be conveniently controlled, the rock mass structure is prevented from being damaged excessively, multistage fracturing coagulum which is diffused radially can be formed, and the anchoring anti-slip effect is greatly improved.
In order to solve the technical problems, the application adopts the following technical scheme: 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 a flow sensor and a pressure sensor are also arranged on the pipeline;
the pipeline is connected with a grouting pipe of the prestressed grouting anchor cable through a grouting joint.
In the preferred scheme, the pipeline end divide into two branches, be equipped with the valve on every branch, first branch is connected with the slip casting pipe of prestressing force slip casting anchor rope through slip casting joint, and the second branch is connected with the anchor eye.
In a preferred scheme, the structure of the pressure regulating valve is as follows: the valve body is internally provided with a spring cavity and a pressure cavity, a rod of the 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 way, a sealing ring is arranged at the position of the valve rod penetrating 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 forms a seal with the fluid cavity, the pressure cavity is provided with a return 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, a stirring tank is further arranged, an inlet of the grouting pump is connected with the stirring tank, and a reflux port of the pressure regulating valve is connected with the stirring tank.
In the preferred scheme, the stirring tank is positioned at the high position of the inlet of the grouting pump.
In the preferred scheme, the grouting pipe is close to the position of afterbody end and is equipped with pipe middle section and tube head section in proper order, is equipped with the side opening in the pipe middle section, is equipped with the end hole at the tube head section, and the internal diameter of grouting pipe is greater than the internal diameter of pipe middle section, and the internal diameter of pipe middle section is greater than the internal diameter of tube head section, when putting into the steel ball of different diameters, can shutoff tube head section and tube middle section respectively.
The construction method adopting the fracturing grouting anchoring construction device comprises the following steps of:
s1, drilling anchor holes in a slope;
s2, the prestressed grouting anchor cable is placed into an anchor hole, and a plugging part is constructed at a position, close to an orifice, in the anchor hole;
s3, connecting a grouting pipe of the prestressed grouting anchor cable with a grouting joint of the fracturing grouting anchoring construction device;
s4, grouting the grouting pipe by using a grouting pump at a pressure exceeding the fracturing pressure, and forming a fracturing coagulum at the tail end of the grouting pipe after the grout is coagulated;
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 for constructing the plugging portion includes: binding a lower plug at the middle part of the prestressed grouting anchor cable, and binding a pipeline connected with the second branch;
after the prestress grouting anchor cable is completely removed, an upper plug is arranged at a position close to the orifice;
after checking for errors, the grouting pump is started, and the expansion mortar is injected from the second branch.
In the preferred scheme, in the step S4, firstly, the fracturing pressure parameters of the rock mass are obtained through a fracturing experiment, the grouting pressure is controlled to be 120-150% of the fracturing pressure, during grouting, retarder mortar is firstly injected, the pressure is maintained for a period of time, and the pressure loss is within a set range, so that the retarder mortar can be continuously injected;
after reaching the preset quantity, injecting quick setting mortar for hole sealing instead;
and maintaining the pressure for a period of time, if the pressure loss exceeds a preset value, continuously injecting the retarding mortar, waiting for a period of time after the preset quantity is reached, re-injecting the retarding mortar before the final setting time, and injecting the quick setting mortar for hole sealing after the period of maintaining the pressure.
In the preferred scheme, after pressure maintaining, before retarder mortar is continuously injected, the grouting joint is taken down, a first steel ball is put into a grouting pipe, and grouting is continuously carried out after the grouting joint is installed;
after grouting for a period of time, taking down the grouting joint, putting a second steel ball into the grouting pipe, and continuing grouting after installing the grouting joint;
through the steps, multistage fracturing coagulum which diffuses radially is obtained.
According to the fracturing grouting anchoring construction device and method, by adopting the scheme of fracturing grouting and accurately controlling grouting pressure, the fracturing coagulum 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 existing prestressed anchor cable for the strongly weathered mudstone slope is solved. The pressure regulating valve is matched with the flow regulating valve, the flow sensor and the pressure sensor, so that grouting pressure can be conveniently and accurately regulated.
Drawings
The application is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic diagram of the overall structure of the present application.
Fig. 2 is a schematic structural view of the prestressed grouting anchor cable of the present application.
Fig. 3 is a schematic cross-sectional view of a prestressed grouting cable of the present application.
Fig. 4 is an enlarged view of a portion of the tip of the grouting pipe according to the present application.
Fig. 5 is a schematic structural view of the pressure regulating valve in the present application.
In the figure: a stirring tank 1; an anchor hole 2; an anchor part 3; an anchor mount 31; a backing plate 32; an anchor 33; a grouting pump 4; a prestressed grouting anchor cable 5; fracturing the coagulum 51; a blocking portion 52; a grouting pipe 53; a tube head section 531; a first steel ball 532; a tube middle 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 chamber 64; a valve body 65; a seal ring 66; a valve stem 67; a pressure chamber 68; a spool 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; 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 prestressed grouting anchor cable 5 through a grouting joint 15. By the structure, accurate grouting pressure control is realized, and compared with a variable frequency grouting pressure control scheme, the variable frequency grouting pressure control scheme with three cylinders has the advantages that the maximum pressure fluctuation is within +/-30% when the rotating speed is the lowest, and the maximum pressure fluctuation is within +/-3% when the scheme is adopted, so that the variable frequency grouting pressure control scheme is greatly lower than the variable frequency grouting pressure control scheme. Thereby avoiding excessive damage of the rock mass while realizing rock mass fracturing. As shown in fig. 3, in this example, a grouting pipe 53 is disposed in the middle of a wire rope 54.
In a preferred embodiment, as shown in fig. 1, the pipeline end is divided into two branches, each branch is provided with a valve, the first branch 10 is connected with a grouting pipe 53 of the prestressed grouting anchor cable 5 through a grouting joint 15, and the second branch 12 is connected with the anchor hole 2. With the structure, the pipe orifice is prevented from being frequently replaced, and the operation is convenient. And when the failure condition of the plugging portion 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 the following structure: the valve body 65 is internally divided into a spring cavity 64 and a pressure cavity 68, a rod of the pressure regulating 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 way, a sealing ring 66 is arranged at the position of the valve rod 67 penetrating through the spring cavity 64, and a pressure spring 63 is arranged between the valve rod 67 and the rod of the pressure regulating handle 61;
the other end of the valve core 69 forms a seal with the fluid chamber 60, the pressure chamber 68 is provided with a return port 602, one end of the fluid chamber 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 is provided with a liquid 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 up and a part of the mortar flows out from the return port 602. Thereby realizing accurate adjustment of grouting pressure. The mortar flow and the pressure can be accurately regulated by matching with the flow regulating valve 9. Accurate control of the pressure and flow of concrete mortars has been a very difficult technical problem. In order to solve the problem, the pressure regulating valve 6 meeting the requirement is redesigned and manufactured, the accurate pressure control of concrete mortar can be met, and the pressure fluctuation of the pressure regulating valve 6 is within +/-3% at maximum according to the feedback of a pressure sensor.
In the preferred embodiment, as shown in fig. 1, a stirring tank 1 is further provided, the inlet of the grouting pump 4 is connected with the stirring tank 1, and the reflux port 602 of the pressure regulating valve 6 is connected with the stirring tank 1.
In a preferred embodiment, as shown in fig. 1, the stirring tank 1 is positioned at a high position at the inlet of the grouting pump 4. With this structure, the slurry is easy to enter.
In the preferred scheme, as shown in fig. 4, the grouting pipe 53 is provided with a pipe middle section 533 and a pipe head section 531 in sequence at the position close to the tail end, a side hole 534 is arranged in the pipe middle section 533, an end hole is arranged in the pipe head section 531, the inner diameter of the grouting pipe 53 is larger than that of the pipe middle section 533, the inner diameter of the pipe middle section 533 is larger than that of the pipe head section 531, and when steel balls with different diameters are placed in the grouting pipe, the pipe head section 531 and the pipe middle section 533 can be plugged respectively. With this structure, the formation of the fracture coagulum 51 with a larger diameter in the stroke argillaceous sandstone area is facilitated by time-sharing grouting, and the anchoring force is greatly improved. By adopting the scheme of precisely controlling the pressure and the flow, the damage of the rock mass can be avoided.
Example 2:
the construction method adopting the fracturing grouting anchoring construction device comprises the following steps of:
s1, drilling anchor holes 2 in a slope; when drilling, staggered construction is needed;
s2, the prestressed grouting anchor cable 5 is put into the anchor hole 2, and a plugging part 52 is constructed at a position, close to an orifice, in the anchor hole 2;
in a preferred embodiment, the construction method for constructing the plugging portion 52 includes: binding a lower plug 55 at the middle part of the prestressed grouting anchor cable 5, and binding a pipeline connected with the second branch 12;
after the prestress grouting anchor cable 5 is completely lowered, 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.
After checking for errors, the grouting pump 4 is started and the expansion mortar is injected from the second branch 12. The expansion mortar is a commercially available product, for example, an expansion mortar described in chinese patent document CN108164225 a. The plugging portion 52 is provided to avoid slurry leakage during the fracturing grouting process.
S3, connecting a grouting pipe 53 of the prestressed grouting anchor cable 5 with a grouting joint 15 of the fracturing grouting anchoring construction device; the grouting joint 15 in this example adopts a high-pressure movable joint.
S4, grouting the grouting pipe 53 by the grouting pump 4 under the condition of exceeding the fracturing pressure, and forming a fracturing coagulation body 51 at the tail end of the grouting pipe 53 after the slurry is coagulated;
in the preferred scheme, before grouting, the fracturing pressure parameters of the rock mass are obtained through fracturing experiments, and the specific scheme is that a complete rock core with target depth is taken, a grouting pipe is pre-buried after drilling, then the rock core is buried in concrete, drain holes are arranged around 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 the pressure is lost, and the highest pressure before the pressure loss is the fracturing pressure parameters of the rock mass.
The grouting pressure is controlled to be 120-150% of the fracturing pressure, during grouting, retarder mortar is injected firstly to enlarge the penetration range of the mortar, the pressure is maintained for a period of time, usually 5-10 min, the pressure loss is within a set range, usually the pressure loss is not lower than 30%, and the retarder mortar can be injected continuously; after reaching the preset quantity, injecting quick setting mortar for hole sealing instead;
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, so that the flow sensor 7 is from large to small to no reading. The flow sensor 7 in this example is an electromagnetic flow sensor, and the minimum starting flow is 1.5L/min.
If the pressure loss exceeds the preset value, namely, the pressure loss is more than 30%, the retarder mortar is continuously injected, after the preset quantity is reached, the retarder mortar is waited for solidification for a period of time, for example, after 36H, other prestressed grouting anchor cables 5 can be constructed in the period of time, the retarder mortar is re-injected before the final solidification time of the anchor hole 2, and after the pressure is maintained for a period of time, the quick setting mortar is re-injected for sealing holes.
During grouting construction, the construction should be staggered, so that the mutual interference of adjacent anchor holes 2 is avoided.
In the preferred scheme, after pressure maintaining, before the retarder mortar is continuously injected, the grouting joint 15 is taken down, the first steel ball 532 is put into the grouting pipe 53, and grouting is continuously carried out after the grouting joint 15 is installed; grouting at this time to form radial diffusion permeation slurry;
after grouting for a period of time, the grouting joint 15 is taken down, a second steel ball 535 is put into the grouting pipe 53, and grouting is continued after the grouting joint 15 is installed; grouting at this time to form radial diffusion permeation slurry of the other stage;
through the above steps, a multistage radially diffused fracture condensate 51 is obtained.
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 embodiments are merely preferred embodiments of the present application, and should not be construed as limiting the present application, and the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without collision. The protection scope of the present application is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this application are also within the scope of the application.
Claims (6)
1. A construction method of a fracturing grouting anchoring construction device is characterized by comprising the following steps: the 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 prestressed grouting anchor cable (5) through a grouting joint (15);
the tail 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 the prestressed grouting anchor cable (5) through a grouting joint (15), and the second branch (12) is connected with the anchor hole (2);
the construction method comprises the following steps:
s1, drilling anchor holes (2) in the slope;
s2, the prestress grouting anchor cable (5) is put into the anchor hole (2), and a plugging part (52) is constructed at a position, close to an orifice, in the anchor hole (2);
in step S2, the construction method for constructing the plugging part (52) comprises the following steps: binding a lower plug (55) at the middle part of the prestress grouting anchor cable (5), and binding a pipeline connected with the second branch (12);
after the prestress grouting anchor cable (5) is finished, an upper plug (56) is arranged at a position close to the orifice;
after checking for errors, starting a grouting pump (4) and injecting the expansion mortar from the second branch (12);
s3, connecting a grouting pipe (53) of the prestressed grouting anchor cable (5) with a grouting joint (15) of the fracturing grouting anchoring construction device;
s4, grouting the grouting pipe (53) by the grouting pump (4) under the condition that the grouting pressure exceeds the fracturing pressure, and forming a fracturing coagulum (51) at the tail end of the grouting pipe (53) after the grout is coagulated;
in the step S4, firstly obtaining fracturing pressure parameters of the rock mass through a fracturing experiment, controlling grouting pressure to be 120-150% of the fracturing pressure, and firstly injecting retarding mortar during grouting, maintaining pressure for a period of time, wherein pressure loss is within a set range, and then continuously injecting retarding mortar;
after reaching the preset quantity, injecting quick setting mortar for hole sealing instead;
maintaining the pressure for a period of time, if the pressure loss exceeds a preset value, continuously injecting the retarding mortar, waiting for a period of time after reaching a preset amount, re-injecting the retarding mortar before the final setting time, and injecting the quick setting mortar for hole sealing after the period of maintaining the pressure;
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.
2. The construction method of the fracturing grouting anchoring construction device according to claim 1, wherein the construction method is characterized in that: the structure of the pressure regulating valve (6) is as follows: the valve body (65) is internally provided with a spring cavity (64) and a pressure cavity (68), a rod of the pressure regulating 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) is hermetically penetrated into the spring cavity (64), a sealing ring (66) is arranged at the position of the valve rod (67) penetrating through the spring cavity (64), and a pressure spring (63) is arranged between the valve rod (67) and the rod of the pressure regulating 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 liquid inlet is provided with a liquid outlet (603).
3. The construction method of the fracturing grouting anchoring construction device according to claim 2, wherein the construction method is characterized in that: the grouting device is also provided with a stirring tank (1), an inlet of the grouting pump (4) is connected with the stirring tank (1), and a reflux port (602) of the pressure regulating valve (6) is connected with the stirring tank (1).
4. The construction method of the fracturing grouting anchoring construction device according to claim 3, wherein the construction method is characterized in that: the stirring tank (1) is positioned at the high position of the inlet of the grouting pump (4).
5. The construction method of the fracturing grouting anchoring construction device according to claim 1, wherein the construction method is characterized in that: the grouting pipe (53) is close to the position of afterbody end and is equipped with pipe middle section (533) and tube head section (531) in proper order, is equipped with side opening (534) in pipe middle section (533), is equipped with the end hole in tube head section (531), and the internal diameter of grouting 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 tube head section (531), when putting into the steel ball of different diameters, can shutoff tube head section (531) and tube middle section (533) respectively.
6. The construction method of the fracturing grouting anchoring construction device according to claim 1, wherein the construction method is characterized in that: after pressure maintaining, before the retarder mortar is continuously injected, the grouting joint (15) is taken down, a first steel ball (532) is put into the grouting pipe (53), and grouting is continuously carried out after the grouting joint (15) is installed;
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);
the multi-stage radially diffused fracturing coagulum (51) is obtained through the above steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111501776.8A CN114232653B (en) | 2021-12-09 | 2021-12-09 | Fracturing grouting anchoring grading construction device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111501776.8A CN114232653B (en) | 2021-12-09 | 2021-12-09 | Fracturing grouting anchoring grading construction device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114232653A CN114232653A (en) | 2022-03-25 |
| CN114232653B true CN114232653B (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202111501776.8A Active CN114232653B (en) | 2021-12-09 | 2021-12-09 | Fracturing grouting anchoring grading construction device and method |
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| JP2009174171A (en) * | 2008-01-23 | 2009-08-06 | Kajima Corp | Water cut-off grout method and water cut-off grout system under high hydraulic pressure |
| KR20100067532A (en) * | 2008-12-11 | 2010-06-21 | 고우이엔씨 주식회사 | Construction method for earth anchor in dual grouting |
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| CN114232653A (en) | 2022-03-25 |
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