CN112921951A - Segmented grouting bag type screw pile and construction method thereof - Google Patents

Abstract

The invention discloses a sectional grouting bag type screw pile and a construction method thereof, wherein the sectional grouting bag type screw pile comprises a steel perforated pipe, a conical pile head, a helical blade, a one-way grout outlet valve, a steel ring, a plugging film and an expanding film; the head part of the steel perforated pipe is a conical pile head, a steel ring and a plugging film are fixed at preset positions at different depths in the steel perforated pipe along the axial direction of the steel perforated pipe, the outer ring of the steel ring is welded on the inner wall of the steel perforated pipe, the inner ring of the steel ring is fixed with the plugging film, and the steel ring and the plugging film divide the steel perforated pipe into a plurality of grouting sections; each grouting section is provided with a plurality of grout outlet holes, each grouting section is provided with an expanded membrane, the expanded membrane is fixed on the outer ring of the steel flower tube through a fixing piece, and the grout outlet holes in the expanded membrane are provided with one-way grout outlet valves; and a helical blade is welded outside the steel flower pipe section between the adjacent expanding membranes.

Description

Segmented grouting bag type screw pile and construction method thereof

Technical Field

The invention relates to the technical field of building pile foundation engineering and foundation treatment, in particular to a sectional grouting bag type screw pile for foundation reinforcement and a construction method thereof.

Background

With the continuous development of engineering construction in China, the requirements of various projects on foundation soil are higher and higher, the bearing capacity and deformation conditions of natural foundations cannot meet the engineering requirements, and the foundation treatment technology needs to be optimized continuously. The grouting method is mainly used for reinforcing the foundation by adopting a compaction grouting method, grouting slurry into the soil under a pressure state through a grouting pipe, forming a slurry bubble and slurry soil combination body around the grouting pipe, extruding and compacting a soil body, and playing a comprehensive reinforcing effect on foundation soil.

At present, grouting methods commonly adopted in engineering include a grouting pipe grouting method, a steel flower pipe grouting method, a sleeve valve pipe grouting method and the like. The grouting methods all have certain problems, such as the phenomena of slurry outlet hole blockage and slurry return easily occur if pre-drilling is needed, the adaptability to the collapsible soil such as loess and the like is poor, the foundation reinforcement effect is not obvious, and the like; there is also a prior art for sectional grouting using a grouting bag, for example, in patent 202020532599.4, a bag type sectional grouting plugging device is disclosed, which has the following problems:

1. at least 3 pipelines are arranged in the patent for gas injection and grouting, and the internal structure is complex;

2. the 'bag' of the patent is only used for plugging a grouting section to prevent grout from flowing out; the air can be discharged after the grouting is finished, and the compaction and reinforcement effect on the stratum is temporary.

3. This patent receives the restriction of device length, need carry out special customization to the device according to the degree of depth of treating the reinforcement section, but reuse rate is low, and the suitability is restricted.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a segmented grouting bag type screw pile and a construction method thereof. The device does not need to be pre-perforated before construction, grouting is carried out by screwing the helical blades into foundation soil, the steel ring plugging film realizes sectional grouting from top to bottom, the outer expanding film forms a diameter expanding body in the foundation soil, soil around the hole is compacted in a compaction mode, meanwhile, the blockage of a grout outlet hole and upward return of grout are prevented, the grouting efficiency and the bearing capacity of a pile body are improved, and after grouting is finished, the steel perforated pipe and the blades serve as a part of the pile body to jointly bear upper load.

The device converts a slurry-soil cementation and reinforcement mechanism in the traditional grouting process into a reinforcement mechanism which mainly expands the pile diameter and compacts foundation soil and assists the slurry-soil cementation, improves the overall reinforcement effect, solves the common problems of slurry return, slurry outlet hole blockage and the like in the traditional grouting process, has the characteristics of high efficiency in segmentation, convenience and controllability, and has wider applicability.

In order to realize the functions, the invention adopts the following technical scheme:

the invention provides a sectional grouting bag type screw pile, which comprises a steel flower pipe, a conical pile head, a screw blade, a one-way grout outlet valve, a buckle, a steel ring, a plugging film and a flaring film, wherein the steel flower pipe is provided with a conical pile head; the head part of the steel perforated pipe is a conical pile head, a steel ring and a plugging film are fixed at preset positions at different depths in the steel perforated pipe along the axial direction of the steel perforated pipe, the outer ring of the steel ring is welded on the inner wall of the steel perforated pipe, the inner ring of the steel ring is fixed with the plugging film, and the steel ring and the plugging film divide the steel perforated pipe into a plurality of grouting sections; each grouting section is provided with a plurality of grout outlet holes, each grouting section is provided with an expanded membrane, the expanded membrane is fixed on the outer ring of the steel perforated pipe through a fixing piece, and the grout outlet holes in the expanded membrane are provided with one-way grout outlet valves; and a helical blade is welded outside the steel flower pipe section between the adjacent expanding membranes.

As a further technical scheme, slurry outlet holes are prefabricated in the surface of the steel perforated pipe, the steel perforated pipe penetrates through the steel perforated pipe in the front and back direction, and a one-way slurry outlet valve is welded in the slurry outlet holes in the expanded membrane after the expanded membrane is formed.

As a further technical scheme, the one-way slurry outlet valve is welded on a slurry outlet hole in the expanded body membrane, so that the soil squeezing effect of the expanded body is prevented from being weakened due to the pressure relief effect at the moment that the plugging membrane is punctured.

As a further technical scheme, the diameter of the spiral blade is about 2 times of that of the steel perforated pipe, the spiral blade is welded on the outer side of the steel perforated pipe at equal intervals, and enough space is reserved between the spiral blade and the expander membrane, so that the expander membrane can expand and deform under the filling of slurry.

As a further technical scheme, the conical pile head can be connected with a steel perforated pipe by welding or threads, so that the conical pile head is convenient to install into the soil.

As a further technical scheme, the buckles are two semicircular steel rings, and the joints radially extend out of a certain width to be used for connecting the two semicircular buckles through bolts.

As a further technical scheme, the outer pipe expanding body membrane is made of rubber and has higher strength, the outer membrane can prevent the blockage of a grout outlet in the drilling process, the smooth grout outlet is ensured, and the expanding body is formed under the filling of grout to prevent the grout from returning upwards and play a role in extruding and compacting soil around the hole wall; the contact surfaces of the expanding film, the buckle and the steel floral tube can be bonded by toughened glue, so that the expanding film is prevented from being separated from the steel floral tube under overlarge grouting pressure.

As a further technical scheme, the steel ring is structurally provided with an upper ring and a lower ring, and the contact surfaces are buckled according to the trapezoidal grooves.

As a further technical scheme, the plugging film is made of rubber, has certain strength, and is integrally fixed in the pipe with the steel ring by glue to form different grouting sections. The membrane can be punctured under the action of certain slurry pressure, and the high efficiency and controllability of the sectional grouting are ensured.

Based on the segmented grouting bag type screw pile, the invention also provides a construction method matched with the segmented grouting bag type screw pile, which comprises the following steps:

step 1, prefabricating a steel perforated pipe, welding a steel ring plugging membrane at a preset position, welding a one-way slurry outlet valve, fixing an outer expanding membrane of the pipe by using a buckle, and welding a helical blade;

step 2, measuring and lofting, and determining hole sites and ground elevations by using a total station according to the foundation treatment requirement;

step 3, adopting a manual or spiral drilling machine to vertically rotate the device into the soil to reach a specified depth, and covering a pipe orifice to prevent impurities from entering the pipe to influence grouting quality;

step 4, starting grouting equipment to perform section-by-section grouting work on the steel perforated pipe from top to bottom, selecting proper grouting pressure until an expanding body of the section is formed, and increasing the grouting pressure to pierce the plugging membrane and enter the next section of grouting;

step 5, properly adjusting grouting pressure, repeating the step 4, and sequentially completing grouting work within a full depth range;

and 6, stopping grouting and sealing the pipe orifice after the grouting amount or the grouting pressure reaches a designed value so as to naturally solidify the grout.

Compared with the prior art, the invention has the advantages that:

(1) the steel perforated pipe can be used as a pile body and a grouting channel, can be screwed into the soil body for direct grouting, and is convenient to construct; after the pile is formed, the reinforcement function is exerted in the foundation to jointly bear the upper load, so that the reinforcement cage is saved, and the engineering cost is saved;

(2) by adopting the segmented grouting method of plugging films and grouting pressure control, a relatively stable grouting pressure environment can be ensured to be maintained in the pipe, and a good grouting reinforcement effect is achieved;

(3) under the protection of the outer expanded body membrane, the grout outlet is not easy to block, the grouting quality and the grouting quality are ensured, the expanded body membrane expands to form a diameter expanding body, the bearing capacity of the pile body is greatly improved, the compaction and compaction effects on the soil body around the pile are exerted, the bearing capacity of the composite foundation is improved, meanwhile, the phenomenon of grout upward return in the traditional grouting process is avoided, the grouting efficiency is improved, and grout waste is reduced;

(4) compared with the traditional grouting process, the method has the characteristics of sectional controllability, high efficiency and convenience, has wider applicability, and can meet the requirements of most foundation treatment.

(5) The 'bag' of the invention is not only used for plugging a grouting section and preventing slurry from flowing out, but also filled with slurry to form a sectional expanding body to bear together with the pile body, thereby greatly improving the bearing capacity of the pile body.

(6) The 'bag' of the invention has continuous extrusion effect on the soil body around the pile after the enlarging body is formed by grouting, and the foundation reinforcement effect is better.

(7) The steel pipe of the invention is not only a pile body but also a grouting pipe, and only the plugging film is arranged in the steel pipe, thus the structure is simple and the manufacture is convenient.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1: the overall structure of the balloon type screw pile according to one or more embodiments of the invention;

FIG. 2: the invention is a schematic diagram of a bladder screw pile after grouting according to one or more embodiments;

FIG. 3: the invention relates to a cross-sectional view of an expanded diameter body according to one or more embodiments;

FIG. 4: the invention provides an enlarged view of a snap according to one or more embodiments;

FIG. 5: the invention relates to a steel ring and a plugging film enlarged view according to one or more embodiments;

in the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.

The grouting valve comprises a steel perforated pipe 1, a conical pile head 2, a helical blade 3, a buckle 4, a steel ring 5, a plugging film 6, a expanding film 7, a grout outlet hole 8, an expanding body 9, a buckle ring 10, a buckle flat plate 11, a bolt hole 12, a trapezoidal groove 13 and a one-way grout outlet valve 14.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.

As introduced in the background art, the defects in the prior art are that in order to solve the technical problems, the invention provides a segmented grouting capsule type screw pile and a construction method thereof; the device converts a slurry-soil cementation and reinforcement mechanism in the traditional grouting process into a reinforcement mechanism which mainly expands the pile diameter and compacts foundation soil and assists the slurry-soil cementation, improves the overall reinforcement effect, solves the common problems of slurry return, slurry outlet hole blockage and the like in the traditional grouting process, has the characteristics of high efficiency in segmentation, convenience and controllability, and has wider applicability.

It should be understood that, in the present embodiment, the inward side is the inner ring and the outward side is the outer ring with respect to the orientation of the steel flower tube 1, and the inward and outward sides in the present embodiment are accurately defined based on the basic orientation.

In a typical embodiment of the invention, a segmented grouting bag type screw pile is disclosed, the whole structure of which is shown in fig. 1 before grouting, and the main parts of the pile comprise a steel flower pipe 1, a conical pile head 2, a helical blade 3, a one-way grout outlet valve 14, a buckle 4, a steel ring 5, a plugging membrane 6 and an expanding membrane 7; the steel perforated pipe 1, the conical pile head 2 and the helical blade 3 can realize that the device is screwed into foundation soil; slurry outlets are arranged on the surface of the steel perforated pipe 1 at intervals, an expander membrane 7 is fixed outside the steel perforated pipe by a clamp, and a one-way slurry outlet valve 14 is arranged in the slurry outlet in the expander membrane; the plugging membrane 6 is arranged in the pipe to form an independent grouting section, and grouting is controlled section by section through grouting pressure.

Further, the steel perforated pipe 1 in this embodiment is a hollow structure, and a steel ring plugging film is welded inside the hollow structure. Furthermore, a plurality of slurry outlet holes 8 are prefabricated on the surface of the steel perforated pipe 1, the slurry outlet holes 8 penetrate through the pipe wall of the steel perforated pipe, and the lower end of the steel perforated pipe 1 is provided with a conical pile head 2.

Further, in the embodiment, the steel floral tube 1 is taken as a main body, a steel ring 5 and a plugging film 6 are fixed at preset positions at different depths in the steel floral tube 1 along the axial direction of the steel floral tube 1, the outer ring of the steel ring 5 is welded on the inner wall of the steel floral tube 1, the plugging film 6 is fixed on the inner ring of the steel ring 5, and the steel ring 5 and the plugging film 6 divide the steel floral tube 1 into a plurality of grouting sections; each section of grouting section is provided with a plurality of grout outlet holes 8, each section of grouting section is provided with an expanded membrane 7, the expanded membrane 7 is fixed on the outer ring of the steel flower tube 1 through a fixing piece, a one-way grout outlet valve 14 is arranged on the grout outlet hole 8 positioned in the expanded membrane 7, and the one-way grout outlet valve 14 is not arranged on the grout outlet hole 8 positioned outside the expanded membrane 7; the helical blades 3 are welded outside the sections of the steel perforated pipe 1 between the adjacent expanding membranes 7, namely in the embodiment, the helical blades 3 are arranged on the steel perforated pipe 1 in a segmented manner and are arranged at intervals with the expanding membranes 7; and the outer wall of the steel pipe section corresponding to the helical blade 3 is provided with a grouting hole, namely the grouting hole corresponds to the grout outlet hole 8 positioned outside the expanded membrane 7.

Furthermore, the head of the steel perforated pipe 1 is a conical pile head 2, and the conical pile head 2 and the helical blades 3 of the whole device can easily enter a foundation soil body to perform grouting work.

Further, the enlarged structural view of the steel ring 5 and the plugging film 6 in the embodiment is shown in fig. 5, the steel ring 5 is in the structure of an upper circular ring and a lower circular ring, and the contact surfaces of the upper circular ring and the lower circular ring are buckled through a preset trapezoidal groove and a preset trapezoidal protrusion; the plugging membrane 6 is pressed between the upper circular ring and the lower circular ring; the upper and lower circular rings are welded on the inner wall of the steel perforated pipe 1.

Furthermore, the plugging film 6 is made of rubber, has certain strength, and is integrally fixed in the pipe with the steel ring by glue to form different grouting sections. The plugging membrane 6 can be punctured under the action of certain slurry pressure, so that the high efficiency and controllability of the segmented grouting are ensured.

Further, the one-way slurry outlet valve 14 in this embodiment is welded to a slurry outlet hole in the enlarged body membrane, so as to prevent the soil squeezing effect of the enlarged body from being weakened due to the pressure relief effect at the moment when the plugging membrane is punctured, and the one-way slurry outlet valve 14 directly adopts an existing one-way valve, which is not described herein again.

Further, the diameter of the helical blade 3 in this embodiment is about 2 times of the diameter of the steel flower tube 1, the helical blade 3 is welded to the outer side of the steel flower tube 1 at equal intervals, and a sufficient space is reserved between the helical blade 3 and the expander membrane 7, so that the expander membrane 7 can be expanded and deformed well when in slurry.

Furthermore, the conical pile head 2 in the embodiment can be connected with the steel perforated pipe 1 by welding or threads, so that the device can conveniently enter the soil; it can also be integrated with the steel floral tube 1, and is specifically determined according to actual construction conditions.

Further, in the present embodiment, the upper and lower portions of the expander membrane 7 are fixed with the clips 4. The enlarged structure of the buckle 4 is shown in fig. 4, and is composed of a left semicircular ring 10 and a right semicircular ring 10, and a flat plate 11 extending from the end of the rings 10, wherein bolt holes 12 are preset in the flat plate 11, and the bolt holes 12 are used for connecting the two semicircular rings 10 by bolts so as to fix the expander membrane 7; the buckle 4 can be made of metal materials, the diameter of the buckle is determined by the pipe diameter at the fixed position and the thickness of the rubber film, and the joint radially extends out of a certain width to be used for connecting two semicircular buckles through bolts.

Furthermore, the outer expanding body membrane 7 of the pipe in the embodiment is made of rubber, has higher strength, can prevent the outer membrane from blocking a slurry outlet hole in the drilling process, ensures smooth slurry outlet, forms an expanding body under the filling of slurry, prevents the slurry from returning upwards and plays a role in extruding and compacting soil around the hole wall; the contact surfaces of the expanding film, the buckle and the steel floral tube can be bonded by toughened glue, so that the expanding film is prevented from being separated from the steel floral tube under overlarge grouting pressure.

The segmented grouting bag type screw pile is connected with the existing grouting equipment, grouting is carried out in the steel floral tube 1 through the existing grouting equipment, grout is discharged through a grout outlet hole in the steel floral tube 1, the expanding body membrane 7 expands after being filled with grout to form an expanding body 9, the expanding body 9 plays a role in compacting soil around the pile, and the expanding body 9 can effectively prevent the grout from returning upwards in the lower grouting process, wherein the structure of the segmented grouting bag type screw pile is shown in figure 2.

The invention provides a bag type sectional grouting device for foundation stabilization and a construction method thereof, wherein the matched construction method comprises the following steps:

A. prefabricating the steel perforated pipe 1 and forming a slurry outlet 8; after being firmly bonded, the steel ring 5 and the plugging film 6 are clamped at a preset position in the steel tube flower tube 1; a one-way slurry outlet valve 14 is welded on a slurry outlet hole in the expanded body membrane; the expanding membrane 7 is fixed outside the steel flower tube 1 by the buckle 4, and can be properly bonded to increase firmness; the helical blade 3 is welded.

B. Measuring and lofting, and determining hole sites and ground elevations by using a total station according to the foundation treatment requirement;

C. a manual or spiral drilling machine is adopted to vertically rotate the device into the soil to reach a specified depth, and the pipe orifice is covered to prevent impurities from entering the pipe to influence the grouting quality;

D. starting grouting equipment to perform section-by-section grouting work on the steel perforated pipe 1 from top to bottom, selecting proper grouting pressure until the section of expanding body 9 is formed, adjusting the grouting pressure to pierce the plugging membrane 6, and entering the next section of grouting;

E. d, properly adjusting grouting pressure, repeating the step D, and sequentially completing grouting in a full depth range;

F. and stopping grouting and sealing the pipe orifice after the grouting amount or the grouting pressure reaches the designed value so as to naturally solidify the grout.

The steel flower pipe pile in the invention can be used as a pile body and a grouting channel, can be screwed into the soil body for direct grouting, and is convenient for construction; after the pile is formed, the reinforcement function is exerted in the foundation to jointly bear the upper load, so that the reinforcement cage is saved, and the engineering cost is saved; by adopting the segmented grouting method of plugging films and grouting pressure control, a relatively stable grouting pressure environment can be ensured to be maintained in the pipe, and a good grouting reinforcement effect is achieved; under the protection of the outer expanded body membrane, the grout outlet is not easy to block, the grouting quality and the grouting quality are ensured, the expanded body membrane expands to form a diameter expanding body, the bearing capacity of the pile body is greatly improved, the compaction and compaction effects on the soil body around the pile are exerted, the bearing capacity of the composite foundation is improved, meanwhile, the phenomenon of grout upward return in the traditional grouting process is avoided, the grouting efficiency is improved, and grout waste is reduced;

compared with the traditional grouting process, the method has the characteristics of sectional controllability, high efficiency and convenience, has wider applicability, and can meet the requirements of most foundation treatment.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without inventive faculty, based on the technical solutions of the present invention.

Finally, it is also noted that relational terms such as first and second, and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A sectional grouting bag type screw pile is characterized by comprising a steel flower pipe, a conical pile head, a screw blade, a one-way grout outlet valve, a steel ring, a plugging film and a reaming film;

the head part of the steel perforated pipe is a conical pile head, a steel ring and a plugging film are fixed at preset positions at different depths in the steel perforated pipe along the axial direction of the steel perforated pipe, the outer ring of the steel ring is welded on the inner wall of the steel perforated pipe, the inner ring of the steel ring is fixed with the plugging film, and the steel ring and the plugging film divide the steel perforated pipe into a plurality of grouting sections; each grouting section is provided with a plurality of grout outlet holes, each grouting section is provided with at least one expanded membrane, the expanded membranes are fixed on the outer ring of the steel flower tube through fixing pieces, and the grout outlet holes in the expanded membranes are provided with one-way grout outlet valves; and a helical blade is welded outside the steel flower pipe section between the adjacent expanding membranes.

2. The sectional-grouting sac type screw pile according to claim 1, wherein the one-way grout outlet valve is welded to a grout outlet hole in the interior of the expanded body membrane.

3. The sectional grouting sac type screw pile according to claim 1, wherein the screw blades are welded at equal intervals outside the steel perforated pipe, and a space for expansion deformation of the expander membrane under filling of grout is reserved between the expander membrane and the outer side of the steel perforated pipe.

4. The sectional grouting sack-type screw pile according to claim 1, characterized in that the fixing member is a snap.

5. The sectional grouting bag type screw pile according to claim 4, wherein the expanding film is made of rubber, and the contact surfaces of the expanding film, the buckle and the steel flower tube are bonded by using toughened glue.

6. The sectional grouting bag type screw pile according to claim 1, wherein the steel ring is in a structure of an upper ring and a lower ring, and the contact surfaces of the two rings are buckled through a trapezoidal groove and a trapezoidal protrusion.

7. The sectional grouting bag type screw pile according to claim 1, wherein the plugging film is made of rubber and is integrally fixed in the steel flower tube by being glued with the steel ring.

8. The sectional grouting sac type screw pile according to claim 1, wherein the outer wall of the steel pipe section corresponding to the helical blade is provided with grouting holes.

9. The construction method of a sectional grouting sac type screw pile according to any one of claims 1 to 8, comprising the steps of:

A. prefabricating a steel perforated pipe, welding a steel ring plugging film at a preset position, welding a one-way slurry outlet valve, fixing an outer expanded body film of the pipe by using a buckle, and welding a helical blade;

B. measuring and lofting, and determining hole sites and ground elevations by using a total station according to the foundation treatment requirement;

C. vertically rotating the device into the soil to reach a specified depth, covering the pipe orifice of the steel perforated pipe, and preventing impurities from entering the pipe to influence the grouting quality;

D. starting grouting equipment to perform section-by-section grouting work on the steel perforated pipe from top to bottom, selecting set grouting pressure until the section of expanded diameter body forms, and increasing the grouting pressure to pierce the plugging membrane and enter the next section of grouting;

E. adjusting grouting pressure, repeating the step D, and sequentially completing grouting work within a full depth range;

F. and stopping grouting and sealing the pipe orifice after the grouting amount or the grouting pressure reaches the designed value so as to naturally solidify the grout.

Images