A device for generating cement-soil solidified materials by injecting cement in the same hole and in layers

Abstract

The present invention provides a device for generating cement-soil solidified materials by injecting cement in the same hole and in layers, which relates to the technical field of grouting reinforcement of underground engineering. The device can confine grouting to any section to achieve the purpose of segmented grouting, and has a simple structure, ingenious design, and is easy to implement. The device includes an elastic grouting outer tube, a rigid core tube sleeved inside the grouting outer tube, and a pointed bottom provided at the bottom of the grouting outer tube. The wall of the core tube is provided with a plurality of long strip openings, and the outside of each of the openings is provided with a plurality of blockers for adjusting the slurry outlet position. The wall of the grouting outer tube is provided with grouting holes. Each of the openings corresponds to a plurality of grouting holes. A one-way expansion ring is provided outside each of the grouting holes. During grouting, the grouting holes that do not need grouting are sealed and connected to the corresponding blockers. The grouting position can be adjusted by changing the position of the blockers to seal the grouting holes at different positions. The technical solution provided by the present invention is applicable to the process of underground grouting reinforcement.

Description

Technical field

[0001] The invention relates to the technical field of underground engineering grouting reinforcement, in particular to a device for generating cement soil solidified materials by grouting in layers in the same hole. [Background Technology]

[0002] In underground engineering grouting reinforcement projects, loose, weak or water-rich strata are often encountered. When grouting and reinforcing such underground cities, the biggest problem faced is the serious phenomenon of borehole collapse and low hole formation rate. In the past, there were two grouting methods: forward grouting and backward grouting. The forward grouting process is to control the depth of the borehole and grout from the shallow ground to the deep ground section by section until the designed grouting depth is reached. Its disadvantage is that the repeated drilling rate is high, and the borehole is easily grouted repeatedly. The backward grouting currently mainly includes the TSS pipe grouting process, which is difficult to achieve separated grouting. When encountering loose soil layers and solid soil layers interlaced, it is easy to cause uneven grouting, making it difficult for the grouting effect to reach the expected design.

[0003] Therefore, it is necessary to study a same-hole layered and same-injection environmentally friendly fiber cement soil solidification generation structure device to address the shortcomings of the existing technology and to solve or alleviate one or more of the above problems. [Summary of the invention]

[0004] In view of this, the present invention provides a same-hole layered and same-injection environmentally friendly fiber cement soil solidification generation structure device, which can confine the slurry to any section for grouting, thereby achieving the purpose of segmented grouting, and has a simple structure, ingenious design, and is easy to implement.

[0005] On the one hand, the present invention provides a device for producing cement-soil solidified products by simultaneously injecting cement in the same hole and in different layers, characterized in that the device comprises an elastic grouting outer tube, a rigid core tube sleeved inside the grouting outer tube, and a pointed bottom provided at the bottom of the grouting outer tube;

[0006] The core tube is provided with a plurality of long strip openings on the tube wall, and a plurality of blockers for adjusting the slurry discharge position are provided on the outside of each of the openings (the adjustment method is to align the blocker with the grouting hole that does not require grouting, and under the action of external pressure, the grouting hole, the blocker and the core tube fit tightly to achieve sealed contact, so that the blocker prevents the grouting hole from discharging slurry); grouting holes are provided on the tube wall of the grouting outer tube; each of the openings corresponds to a plurality of the grouting holes; a one-way expansion ring is provided outside each of the grouting holes; during grouting, the grouting holes that do not require grouting are sealed and connected with the corresponding blocker, and the grouting position is adjusted by changing the position of the blocker to seal the grouting holes in different positions.

[0007] According to the above aspects and any possible implementation, an implementation is further provided, wherein the blocker includes a connecting piece and a stop slurry plate, and both ends of the stop slurry plate are detachably connected to the outer wall of the core tube through the connecting piece.

[0008] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the one-way expansion ring includes a directional ring and a rubber pad, a fixing rod for installing the rubber pad and fixing the rubber pad is provided in the middle of the directional ring, and an expansion ring opening is provided on the edge of the directional ring for limiting the direction of slurry outflow; the rubber pad is located between the directional ring and the grouting outer pipe.

[0009] According to the above aspects and any possible implementation, an implementation is further provided, wherein a mounting screw hole is provided in the middle position of the fixing rod, a mounting screw is provided in the mounting screw hole, and the mounting screw is threadedly connected to the grouting outer pipe.

[0010] The aspects described above and any possible implementation manner further provide an implementation manner, in which, during the grouting process, under the action of external pressure, the core tube, the blocker and the grouting outer tube are in sealed contact connection.

[0011] The aspects described above and any possible implementation method further provide an implementation method, whereby when the internal grouting pressure is greater than the external pressure, the one-way expansion ring corresponding to the grouting hole of normal grouting is in an outwardly open state; when the external pressure is greater than the internal slurry pressure, all the one-way expansion rings are in a closed state to prevent the slurry from flowing back.

[0012] According to the above aspects and any possible implementation, a further implementation is provided, wherein the grouting outer pipe is made of PVC material, and the core pipe is a steel pipe.

[0013] According to the above aspects and any possible implementation, an implementation is further provided, in which the same openings are provided on both symmetrical sides at the same position of the core tube.

[0014] According to the above aspects and any possible implementation, a further implementation is provided, wherein the core tube is provided with a plurality of symmetrically arranged openings.

[0015] On the other hand, the present invention provides a method for producing cement-soil solidified material by simultaneous injection of cement in the same hole and in different layers, characterized in that the method is applicable to any of the above-mentioned devices;

[0016] The method includes: before grouting, determining grouting holes that do not require grouting according to actual grouting needs, and adjusting the position of the blocker so that each grouting hole that does not require grouting is correspondingly installed with a blocker; the actual grouting needs include information about underground grouting layers and grouting flow requirements for each layer;

[0017] Adjust the installation direction of the one-way expansion ring according to the desired slurry outflow direction.

[0018] Compared with the existing technology, the present invention can achieve the following technical effects: the slurry can be confined to any section for grouting, which can achieve the purpose of segmented grouting, and has a simple structure, ingenious design, and is easy to implement; it is suitable for surface grouting within 50m, and both vertical and horizontal grouting are possible; by adjusting the position of the movable blocker, the grouting level can be controlled, and a variety of grouting processes such as simultaneous grouting in layers, intermediate cross-layers, upper and lower grouting, and layered grouting with a variety of different slurries can be realized, effectively solving the problems of uneven grouting, segmented grouting, and multiple drilling grouting in the past.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a device for generating environmentally friendly fiber cement soil solidified materials by simultaneously injecting the same layer into the same hole according to an embodiment of the present invention;

[0022] Figure 2 This is a front view of the structure of a one-way expansion ring provided by one embodiment of the present invention;

[0023] Figure 3 It is a side structural diagram of a one-way expansion ring provided by one embodiment of the present invention. [Specific implementation method]

[0024] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0026] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0027] In view of the deficiencies in the prior art, the present invention provides a same-hole, same-layer grouting structure device based on layered grouting to realize a super same-hole, layered grouting process.

[0028] A device for layered grouting in the same hole and layered injection, comprising: an outer grouting tube, a core tube, and a blocking device. The core tube is a steel pipe 8 with an opening 5, and is provided with four blockers, each consisting of a connector 7 and a grouting stopper 3. The slurry can flow out in layers. The outer tube has a pointed bottom 1 at the bottom, and multiple one-way expansion rings 2 are provided on both sides, connected to the grouting holes 6. Under pressure, the slurry flows out of the grouting holes, breaks through the leather sleeves of the one-way expansion rings 2, and enters the designated grouting formation.

[0029] The outer grouting pipe is a PVC grouting pipe, and the core pipe is a metal pipe. The outer grouting pipe body is provided with a plurality of grouting openings. The outer grouting pipe is threadedly connected to the bottom of the core pipe, and the bottom of the outer pipe is provided with a conical tip 1.

[0030] The connecting plate between the core tube and the obstructer connector 7 is provided with through holes corresponding to the through holes on the inner tube section, and the connecting plate is connected to the top of the inner tube section at the uppermost end of the inner tube via the inner tube connecting rod. The obstructer is nested in a ring shape on the outside of the inner tube. The obstructer can slide up and down and is fixed in position by the connector. According to the grouting needs of different strata, the obstructer is adjusted up and down to adjust the slurry to flow out of a specific grouting hole. The connector 7 is provided with an opening to facilitate the adjustment of the obstructer position and then fix it with screws. Grouting can be repeated in the grouting area as needed. Different grouting materials can be used in the same grouting core tube, and different grouting parameters can be selected for grouting.

[0031] The outer grouting tube is provided with a grouting hole 6, and a one-way expansion ring 2 is positioned outside the grouting hole 6. Under pressure, the core tube, the obturator, and the outer grouting tube form a sealed structure, providing a good seal. Slurry can only flow out of the grouting hole 6, breaking through the rubber pad 10 of the one-way expansion ring 2 and injecting into the soil layer. When the external pressure exceeds the internal pressure of the tube, the rubber pad of the one-way expansion ring covers the expansion ring opening of the one-way expansion ring 2, thereby covering the grouting hole 6 and preventing slurry backflow.

[0032] It is generally used for surface grouting within 50m, and can be used for vertical and horizontal grouting. It can limit the slurry to any section for grouting, and can achieve the purpose of segmented grouting.

[0033] Figure 1 The external structure diagram of the same-hole layered and same-injection structure device in the unused state is given. The grouting outer pipe and the lower pointed bottom 1 can be made into a whole, or can be connected using a threaded structure to facilitate cleaning and unblocking the inner wall of the pipe. The outer sides of the grouting outer pipe wall adopt a hole mosaic type, and are evenly inlaid with a number of symmetrical and evenly distributed one-way expansion rings 2, that is, a plurality of grouting holes are provided on the outer pipe, and a one-way expansion ring is provided on the outside of the grouting hole to prevent the slurry from flowing back. A directional ring 4 can be further provided on the one-way expansion ring 2, such as Figure 2 As shown, the one-way expansion ring 2 is a protection device to prevent slurry from flowing back. It is mainly composed of a directional ring 4 and a rubber pad 10. It is in a sealed state under normal conditions. Figure 3 As shown, during operation, under the action of internal slurry pressure, the rubber pad flips outward, allowing slurry to flow out. When the external pressure exceeds the internal pressure of the grouting device, the rubber pad 10 closes to prevent slurry from flowing back. By adjusting the directional ring 4, the direction of the rubber pad opening (i.e., the expansion ring opening) can be adjusted to control the direction of slurry outflow, effectively preventing slurry from flowing back into the device through the grouting hole 6. The directional ring 4 is circular, with a fixed rod in the middle. The fixed rod passes through the center of the directional ring and is fixedly connected to the two side circles. A mounting hole is provided in the middle of the fixed rod (i.e., at the center of the directional ring) for fixing the directional ring and the rubber pad to the grouting outer tube. That is, when assembled, the rubber pad 10 is located between the directional ring and the grouting outer tube. A pair of expansion ring openings are provided on the edge of the directional ring 4 to control the direction of slurry outflow when the rubber pad is grouting under internal pressure. Changing the installation direction of the directional ring 4 can also play a role in regulating the slurry outflow direction. The line connecting the two expansion ring openings is preferably perpendicular to the fixed rod and passes through the center of the directional ring.

[0034] The core pipe of the structural device adopts a 6" steel pipe 8. The bottom of the steel pipe 8 is connected to the grouting outer pipe through a threaded structure. The slurry is injected from the upper part of the steel pipe. The steel pipe is provided with an opening 5. The opening 5 is a long strip opening on the core pipe to ensure the smooth flow of the slurry. The core pipe is a hollow circular pipe with openings on both symmetrical sides to facilitate the smooth flow of the slurry. Similar openings can be symmetrically provided on the upper, middle and lower parts of the core pipe. Figure 1 The dotted line in the middle indicates the planned opening. The function of the blocker is to control the grouting position and adjust the grouting amount. The main implementation method is to adjust the position of multiple blockers to correspond the core tube opening slurry outlet position to the specific outer tube grouting hole to ensure directional grouting, and to isolate the unnecessary grouting holes with two blockers to prevent the slurry from flowing out. There are four blocker rings on the outside of the core tube. The stop plate is connected to the core tube by a connector 7, and the grouting amount is regulated and stopped by controlling the stop plate 3. The stop plate 3 is a functional element of the blocker. By adjusting the position of the blocker so that the stop plate is located opposite to the grouting hole 6, the grouting of the grouting hole can be stopped. When the position of the upper and lower blockers is adjusted, the number of grouting holes between the two blockers can be controlled to adjust the grouting amount. By adjusting the position of the mobile blocker, the grouting level can be controlled, and various grouting processes such as simultaneous grouting in layers, intermediate cross-layers, upper and lower grouting, and layered grouting with multiple different slurries can be realized, effectively solving the problems of uneven grouting, segmented grouting, and multiple drilling grouting in the past. It should be noted that the position of the stopper should be adjusted according to the grouting requirements before assembly, and it cannot be moved during the grouting process. The connecting piece and the stopper form the blocker, which ensures that the blocker can move up and down on the core pipe and is fixed in place by screws.

[0035] The slurry can be single-liquid slurry or double-liquid slurry. The single-liquid slurry grouting material uses 32.5-grade ordinary Portland cement with a water-cement ratio of 0.5:1 to 1:1; the double-liquid slurry grouting material uses 32.5-grade ordinary Portland cement with a water-cement ratio of 1:1 to 2:1, plus 2% water glass; use a 100-type or 300-type engineering geological drilling rig, casing wall protection, or use a pipe drilling rig to guide the hole; level the site near the hole, and then measure and lay out; during the grouting construction, the hole layout method, grouting parameters and slurry ratio should be further adjusted through field tests, and appropriate adjustments should be made according to the actual situation on site during the subsequent grouting construction process to ensure the grouting effect; the hole mouth grouting rate shall not be less than 90% (grouting The qualified rate of diffusion radius of each grouting cycle shall not be less than 90%; corresponding measures shall be taken to prevent pipe blockage during the grouting process, such as conducting more tests to select a reasonable setting time, paying attention to pressure changes, and promptly lifting the core pipe if the pressure rises; it is strictly forbidden to use unqualified materials, and damp or expired cement shall not be used; when making slurry, the water-cement ratio shall be strictly controlled according to the design and shall not be changed at will; the grouting pressure and grouting volume shall be closely monitored, and the injection shall be stopped immediately in case of abnormality, the cause shall be identified and corresponding measures shall be taken; the next process may only be carried out after the slurry meets the design requirements; the management of slurry shall be strengthened to prevent the loss of slurry.

[0036] The above-mentioned technical solution provided by the present invention can achieve the following technical effects: the main body of the structure adopts metal steel pipes, which can be used repeatedly for a long time and save materials. The bottom of the structure adopts a conical pointed bottom, which effectively reduces the ground resistance during the pipe laying process and saves manpower and material resources. By improving the previous grouting method, layered and skip-layer grouting can be achieved, and when grouting in complex soil layers such as loose soil layers and dense soil layers, optimized grouting can be achieved. Grouting in the same layer at the same time in the same hole avoids repeated drilling and grouting, and achieves high efficiency, precision and optimization.

[0037] The above describes in detail the structural device for generating environmentally friendly fiber-cement-soil solidified materials using the same hole and layered injection method, as provided in the embodiments of this application. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of this application. Furthermore, those skilled in the art will appreciate that variations in the specific implementation and scope of application may occur based on the concepts of this application. Therefore, the contents of this specification should not be construed as limiting this application.

[0038] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" and "comprising" mentioned throughout the specification and claims are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problems within a certain error range and basically achieve the technical effects. The subsequent description in the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be as defined in the attached claims.

[0039] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0040] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0041] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A device for producing cement soil solidified material by injecting cement in the same hole and in layers, characterized in that: The device comprises an elastic grouting outer tube, a rigid core tube sleeved inside the grouting outer tube, and a pointed bottom arranged at the bottom of the grouting outer tube; The core tube is provided with a plurality of long strip openings on the wall, and a plurality of obturators for adjusting the slurry discharge position are provided on the outside of each opening; grouting holes are provided on the wall of the grouting outer tube; each of the openings corresponds to a plurality of grouting holes; a one-way expansion ring is provided outside each grouting hole; during grouting, the grouting holes that do not need grouting are sealed and connected to the corresponding obturators, and the grouting position can be adjusted by changing the position of the obturators to seal the grouting holes at different positions; The obstructer includes a connecting piece and a stop slurry piece, and both ends of the stop slurry piece are detachably connected to the outer wall of the core tube through the connecting piece; The one-way expansion ring includes an orientation ring and a rubber pad. A fixing rod for installing and fixing the rubber pad is provided in the middle of the orientation ring. An expansion ring opening is provided on the edge of the orientation ring for limiting the outflow direction of the slurry. The rubber pad is located between the orientation ring and the grouting outer pipe. The obstruction can slide up and down and is fixed in position by a connecting piece. According to the grouting requirements of different formations, the obstruction can be adjusted up and down to adjust the slurry flow out of a specific grouting hole; The fixing rod passes through the center of the directional ring and is fixedly connected to the circles on both sides. A mounting hole is provided in the middle of the fixing rod, i.e., the center of the directional ring, for fixing the directional ring and the rubber pad on the grouting outer tube, i.e., the rubber pad is located between the directional ring and the grouting outer tube during assembly; a pair of expansion ring openings are provided on the edge of the directional ring, for limiting the slurry outflow direction when the rubber pad is grouting under the pressure inside the tube; the installation direction of the directional ring is changed, which can adjust the slurry outflow direction.

2. The device for producing cement-soil solidified materials by simultaneously injecting cement into the same hole and in layers according to claim 1, characterized in that: A mounting screw hole is provided in the middle of the fixing rod, a mounting screw is provided in the mounting screw hole, and the mounting screw is threadedly connected to the grouting outer pipe.

3. The device for producing cement-soil solidified materials by simultaneously injecting cement into the same hole and in layers according to claim 1, characterized in that: During the grouting process, under the action of external pressure, the core pipe, the obturator and the grouting outer pipe are in sealed contact connection.

4. The device for producing cement-soil solidified materials by simultaneously injecting cement into the same hole and in different layers according to claim 1, characterized in that: When the internal grouting pressure is greater than the external pressure, the one-way expansion ring corresponding to the grouting hole of normal grouting is in an outwardly open state; when the external pressure is greater than the internal slurry pressure, all the one-way expansion rings are in a closed state to prevent the slurry from flowing back.

5. The device for producing cement-soil solidified material by simultaneously injecting cement in the same hole and in different layers according to claim 1, characterized in that: The grouting outer pipe is made of PVC material, and the core pipe is a steel pipe.

6. The device for producing cement-soil solidified material by simultaneously injecting cement in the same hole and in different layers according to claim 1, characterized in that: The same openings are provided on both symmetrical sides at the same position of the core tube.

7. The device for producing cement-soil solidified material by simultaneous injection of cement in the same hole and in layers according to claim 6, characterized in that: The core tube is provided with a plurality of symmetrically arranged openings.

8. A method for producing cement-soil solidified material by simultaneous injection of cement in the same hole, characterized in that: The method adopts the device according to any one of claims 1 to 7; The method comprises: before grouting, determining grouting holes that do not need grouting according to actual grouting needs, and adjusting the position of the blocker so that each grouting hole that does not need grouting is correspondingly installed with a blocker; Adjust the installation direction of the one-way expansion ring according to the desired slurry outflow direction.

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