Grouting bag device and construction method thereof

Abstract

The invention discloses a grouting bag device and a construction method thereof. The grouting bag device and the construction method thereof comprise a grouting main pipe (34) and bag sections (36). A bin dividing mechanism (39) is arranged in the grouting main pipe and divides the inner space of the grouting main pipe into a certain number of independent closed bin dividing sections (341), and each bin dividing section corresponds to one bag subsection. Aiming at each branch bin section, a grouting hole (38) is formed in the grouting main pipe, and the grouting holes are communicated with the bag sections and the branch bin sections; a grouting straight-through pipe (32) is arranged in the grouting main pipe and corresponds to each branch bin section; a grouting liquefying device (35) is arranged aiming at each bag section and the corresponding branch bin section; and grouting liquid is injected into the designated bag sections in the foundation pit excavation process. According to the grouting bag device and the construction method thereof, grouting of the designated branch bin sections can be achieved, and secondary liquefaction of the grouting body can be achieved for multiple times of grouting.

Description

Technical Field

[0001] The invention relates to a bag grouting technology in the construction industry, and in particular to a grouting bag device and a construction method thereof. Background Art

[0002] At present, during the construction of foundation pit projects, a grouting bag device is often used to exert influence on the soil around the foundation pit project. Specifically, a large number of grouting bag devices are arranged in rows in the soil around the foundation pit, and then grouting is performed thereon, so that the stratum loss caused during the foundation pit excavation process can be compensated.

[0003] The current problem is:

[0004] 1) In the prior art grouting bag device, when grouting, the injected grouting liquid flows into each bag segment in an undirectional manner, thereby failing to achieve refined directional positioning to control soil displacement and deformation;

[0005] 2) After the grouting bag device of the prior art is grouted, the grouting operation can no longer be performed after the injected grouting liquid solidifies. At this time, if the soil body is further displaced and deformed, it cannot be further controlled. Summary of the invention

[0006] The object of the present invention is to provide a grouting bag device and a construction method thereof, which can realize grouting in designated compartment sections and can realize secondary liquefaction of the grouting body for multiple grouting.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] A grouting bag device comprises a grouting main pipe and a bag segment; a compartment mechanism is arranged inside the grouting main pipe, the compartment mechanism divides the internal space of the grouting main pipe into a certain number of independently closed compartment segments, each compartment segment corresponds to a bag segment; a grouting hole is opened on the grouting main pipe for each compartment segment, the grouting hole connects the bag segment and the compartment segment; a grouting straight-through pipe is arranged inside the grouting main pipe for each compartment segment; a grouting body liquefaction device is arranged for each bag segment and its corresponding compartment segment.

[0009] Furthermore, the compartment division mechanism includes a connecting rod and a certain number of partition plates; all the partition plates are discretely arranged in the grouting main pipe, each partition plate is horizontally separated in the grouting main pipe, all the partition plates are connected and combined together by connecting rods, and the interval space between two adjacent partition plates serves as the compartment division section.

[0010] Furthermore, a sealing ring is arranged at the edge of each sealing plate.

[0011] Furthermore, a check valve is provided at the grouting hole.

[0012] Furthermore, a plurality of grouting holes are provided on each grouting straight-through pipe, and the grouting holes are located in the compartment section to which the grouting straight-through pipe belongs.

[0013] Furthermore, the grouting body liquefaction device is a current conductor or a heater.

[0014] A construction method for a grouting bag device, wherein the grouting bag device is the above-mentioned grouting bag device; the construction method comprises: before excavating a foundation pit, setting a grouting bag device between the foundation pit project and the protected object structure; during the excavation of the foundation pit, according to monitoring data, injecting grouting liquid into a designated bag segment to form a solid body; during further excavation of the foundation pit, according to monitoring data, liquefying the solid body in the designated compartment segment and the bag segment, so that the solid body is liquefied, and injecting grouting liquid into the designated bag segment again.

[0015] Furthermore, the grouting fluid is an electrorheological fluid, and the grouting body liquefaction device adopts a current conductor.

[0016] Furthermore, the grouting liquid is a hot melt, and the grouting body liquefaction device adopts a heater.

[0017] Furthermore, the grouting volume of each compartment section should be specified, and the grouting pressure should be adjusted in real time according to the surrounding monitoring data.

[0018] Compared with the prior art, the grouting bag device and the construction method of the present invention have the following beneficial effects:

[0019] 1) In the grouting bag device of the present invention, an exclusive grouting straight-through pipe is provided for each bag segment and its corresponding compartment segment, so that independent grouting of each bag segment can be achieved. In this way, during the foundation pit construction process, each compartment segment and its corresponding bag segment in the grouting bag device can be independently grouted according to soil detection data and construction requirements, thereby realizing refined directional positioning and controlling soil displacement and deformation.

[0020] 2) In the grouting bag device of the present invention, a dedicated grouting body liquefaction device is provided for each bag segment and its corresponding compartment segment. In this way, during the foundation pit construction process, after the grouting liquid solidifies, some grouting body liquefaction devices can be controlled in a targeted manner based on soil detection data and construction requirements, so that the grouting solidified body in the designated target bag segment and its corresponding compartment segment melts into liquid, and then these bag segments can be grouted again, thereby achieving secondary liquefaction of the grouting body for multiple groutings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a foundation pit project involved in the grouting bag device of the present invention;

[0022] Figure 2 It is a schematic diagram of the appearance of the grouting bag device of the present invention;

[0023] Figure 3 It is a longitudinal cross-sectional schematic diagram of the grouting bag device of the present invention;

[0024] Figure 4 It is a longitudinal section diagram of the grouting main pipe;

[0025] Figure 5 It is a structural schematic diagram of the compartment mechanism inside the grouting main pipe;

[0026] Figure 6 It is an enlarged schematic diagram of the grouting hole;

[0027] Figures 7 to 9 Schematic diagram of the grouting bag device of the present invention being applied in multiple scenarios,

[0028] in,

[0029] Figure 7 In the application scenario, the foundation pit project is near a ground building, and the grouting bag device is close to the surrounding structure.

[0030] Figure 8 In the application scenario, the foundation pit project is near an underground tunnel, and the grouting bag device is close to the surrounding structure.

[0031] Fig. 9 In the application scenario, the foundation pit project is near a ground building, and the grouting bag device is arranged under the ground building. DETAILED DESCRIPTION

[0032] The present invention will be further described below with specific embodiments:

[0033] This embodiment provides a grouting bag device, which is arranged around a foundation pit project to compensate for the stratum loss caused by foundation pit excavation.

[0034] See also Figure 1 , the figure shows the foundation pit project involved in this embodiment, a retaining structure 1 is arranged around the foundation pit, and a horizontal support 2 is arranged inside the foundation pit.

[0035] In this embodiment, a large number of the grouting bag devices are arranged in rows in the soil around the foundation pit (it can be one side of the periphery or the entire periphery). Through segmented grouting, the stratum loss caused during the foundation pit excavation process can be compensated. By dynamically adjusting the grouting sections and the segmented grouting amounts, the impact of the foundation pit project on the surrounding environment can be reduced.

[0036] Specifically, see Figure 2 ,

[0037] The grouting bag device 3 mainly includes a grouting main pipe 34 , on the outer peripheral surface of which a certain number of bag segments 36 are arranged. Starting from the bottom of the grouting main pipe 34 , these bag segments 36 are arranged in sequence from bottom to top.

[0038] A grouting pipeline is provided inside the grouting main pipe 34, and the grouting pipeline is connected from the upper end of the grouting main pipe 34 to the bag segment 36 at the lower part of the grouting main pipe 34. In this way, a grouting machine is provided on the ground, and the grouting port of the grouting machine is connected with the grouting pipeline port at the upper end of the grouting main pipe 34, so that the bag segment 36 can be grouted through the grouting pipeline, and the grouting expanded bag segment 36 can realize the control of the displacement and deformation of the surrounding soil (as known to those skilled in the art).

[0039] The basic configuration of the above-mentioned grouting bag device 3 belongs to the prior art.

[0040] See also Figure 3 , Figure 4 and Figure 5 The innovation of the grouting bag device 3 of this embodiment mainly lies in the arrangement of the grouting pipeline inside the grouting main pipe 34.

[0041] Specifically,

[0042] A compartment mechanism 39 is provided inside the grouting main pipe 34. The function of the compartment mechanism 39 is to divide the internal space of the grouting main pipe 34 into a certain number of independent and closed space segments. For the convenience of description, the space segments are referred to as compartment segments 341. On the grouting main pipe 34, one compartment segment 341 corresponds to one bag segment 36.

[0043] More specifically, the compartment dividing mechanism 39 is composed of a connecting rod 391 and a certain number of sealing plates 392.

[0044] The connecting rod 391 penetrates all the sealing plates 392, and the connecting rod 391 is arranged in the middle of all the sealing plates 392, so that all the sealing plates 392 are connected in series, and each sealing plate 392 is fixedly assembled and connected with the connecting rod 391, so as to form an integral compartment mechanism 39. The connection between the sealing plate 392 and the connecting rod 391 can be a welding connection or a threaded connection. All the sealing plates 392 in the compartment mechanism 39 are parallel to each other, and the connecting rod 391 is perpendicular to each sealing plate 392. In the grouting main pipe 34, the connecting rod 391 of the compartment mechanism 39 is on the central axis of the grouting main pipe 34, and all the sealing plates 392 are horizontally separated in the grouting main pipe 34 (arranged in a transverse partition), and each adjacent sealing plate 392 in the compartment mechanism 39 is separated by a certain distance. In other words, all the sealing plates 392 are discretely arranged, and the interval space between two adjacent sealing plates 392 serves as the compartment section 341 mentioned above.

[0045] It should be noted that for each compartment segment 341, a grouting hole 38 is opened on the grouting main pipe 34, and the grouting hole 38 connects the corresponding bag segment 36 and the compartment segment 341. The grouting hole 38 is used to "allow the grouting material in the compartment segment 341 to enter the bag segment 36 through the grouting hole 38" (see below for details).

[0046] See also Figure 6 A check valve 381 is also provided at the grouting hole 38. The function of the check valve 381 is that the grouting liquid in the compartment section 341 can enter the bag section 36 through the grouting hole 38, while the grouting liquid in the bag section 36 cannot return to the compartment section 341 through the grouting hole 38. It should be noted that the check valve 381 is a component of the prior art, and is essentially a rubber ring, which is sleeved on the outside of the grouting main pipe 34 and abuts against the grouting hole 38, so as to realize unidirectional flow of liquid, which is common knowledge known to those skilled in the art.

[0047] In order to achieve a better separation and sealing effect, a sealing ring is further provided at the edge of each sealing plate 392, and the sealing ring fits tightly with the inner wall of the grouting main pipe 34, thereby preventing leakage during grouting.

[0048] The aforementioned “a grouting pipeline is arranged inside the grouting main pipe 34” is specifically implemented in the following structural form:

[0049] Inside the grouting main pipe 34, a dedicated grouting straight pipe 32 is provided for each compartment section 341. The upper end of the grouting straight pipe 32 is located at the upper end of the grouting main pipe 34 and is connected to the grouting port of the grouting machine. The lower end of the grouting straight pipe 32 is connected to the corresponding compartment section 341. In this way, the grouting machine can directly inject the grouting liquid into the corresponding compartment section 341 through the grouting straight pipe 32, and allow the grouting liquid to enter the corresponding bag section 36 through the grouting hole 38. In other words, a dedicated grouting straight pipe 32 is provided for each bag section 36, so that each bag section 36 can be grouted independently. All the grouting straight pipes 32 in the grouting main pipe 34 are combined together to form a grouting pipeline.

[0050] In addition, a plurality of grouting holes 321 are provided on each grouting straight pipe 32, and these grouting holes 321 are all located in the compartment section 341 to which the grouting straight pipe 32 belongs. Such a setting is conducive to improving the grouting efficiency.

[0051] In this embodiment, a dedicated grouting body liquefaction device 35 is provided for each bag segment 36 and its corresponding compartment segment 341 in the grouting bag device 3. The grouting body liquefaction device 35 is arranged close to the bag segment 36 and the compartment segment 341 to which it belongs. The function of the grouting body liquefaction device 35 is to melt the solidified grouting liquid in the bag segment 36 and the compartment segment 341, so that the solidified grouting liquid melts into liquid to facilitate grouting again (see below for details).

[0052] The grouting bag device of this embodiment works as follows:

[0053] In the early stage of foundation pit construction, a large number of grouting bag devices 3 are pre-buried around the foundation pit project and connected to a grouting machine; during the construction of the foundation pit, according to the underground soil detection data and the construction requirements, each bag segment 36 in the grouting bag device 3 is independently grouted, and the injected grouting liquid first enters the corresponding compartment segment 341, and then enters the bag segment 36 through the grouting hole 38; after the injected grouting liquid solidifies, it can play a role in stabilizing the soil. In the further construction of the foundation pit, according to the underground soil detection data and the construction requirements, some grouting body liquefaction devices 35 are targeted to start, so that the grouting solidified body in the designated target bag segment 36 and its corresponding compartment segment 341 melts into a liquid state, and then these bag segments 36 can be grouted again. In this way, the purpose of multiple segmented grouting can be achieved, the stratum loss caused by foundation pit excavation can be reduced, and the impact on the surrounding environment can be reduced.

[0054] In this embodiment, the grouting liquid is an electrorheological fluid, while in other embodiments, a hot melt can also be used. The hot melt can be a compound of one or more materials such as asphalt and hot melt adhesive.

[0055] It should be noted that, in this embodiment, the grouting body liquefaction device 35 adopts a current conductor, which is arranged on the outside of the grouting main pipe 34, and has conductive wires extending into the compartment section 341 and the bag section 36. As mentioned above, in this embodiment, the grouting liquid adopts an electrorheological fluid, so that when the current conductor is energized, the energized current flows through the electrorheological fluid, which will cause the electrorheological fluid to liquefy.

[0056] In other embodiments, if the grouting liquid is a hot melt, the grouting body liquefaction device 35 may use a heater, so that the grouting solidification body can be liquefied by heating.

[0057] The grouting bag device of this embodiment has the advantages that:

[0058] 1) In the grouting bag device 3 of the present embodiment, an exclusive grouting straight-through pipe 32 is provided for each bag segment 36 and its corresponding compartment segment 341, so that each bag segment 36 can be independently grouted. In this way, during the foundation pit construction process, each compartment segment 341 and its corresponding bag segment 36 in the grouting bag device 3 can be independently grouted according to the soil detection data and construction requirements, so as to realize refined directional positioning and control of soil displacement and deformation.

[0059] 2) In the grouting bag device 3 of the present embodiment, a dedicated grouting body liquefaction device 35 is provided for each bag segment 36 and its corresponding compartment segment 341. In this way, during the foundation pit construction process, after the grouting liquid solidifies, some grouting body liquefaction devices 35 can be controlled in a targeted manner according to the soil detection data and construction requirements, so that the grouting solidified body in the designated target bag segment 36 and its corresponding compartment segment 341 is melted into liquid, and then these bag segments 36 can be grouted again, thereby realizing secondary liquefaction of the grouting body for multiple groutings.

[0060] In summary, the grouting bag device 3 of this embodiment can achieve the purpose of segmented multiple grouting.

[0061] In addition, this embodiment also provides a grouting bag device construction method, which is as follows:

[0062] First, the sealing plates 392 are divided according to the predetermined spacing of the bag segments 36 and fixedly connected by connecting rods 391 (welding or threaded connection can be used) to form compartment sections 341; then the grouting straight-through pipes 32 are respectively connected to the empty compartments formed between each adjacent sealing plate 392, and the sealing ring is wrapped around the outer edge of the sealing plate 392.

[0063] Then, the compartment segment 341 is placed at a predetermined position of the grouting main pipe 34, fixedly connected by welding or bolts, and the bag segment 36 is wrapped around the outer surface of the grouting main pipe 34 in the area of ​​two adjacent sealing plates 392 to form a grouting bag device 3. That is, each grouting straight pipe 32 corresponds to a bag segment 36, and when grouting is performed on one of the grouting straight pipes 32, the bag segment 36 in the corresponding area can be filled.

[0064] Then, before the foundation pit is excavated, a hole-making device is used to drill a hole at a predetermined position between the retaining structure 1 of the foundation pit project and the existing protective structure, and the grouting bag device 3 is placed at the predetermined elevation of the drilled hole.

[0065] The existing protection structures mentioned here generally refer to various structures around the foundation pit project that need to be protected, including above-ground structures and underground structures, such as building structures on the ground, underground tunnel structures, etc. The existing protection structures can also be called protection object structures.

[0066] Subsequently, during the excavation of the foundation pit, according to the feedback of the monitoring data, grouting liquid is injected into the designated compartment sections 341 between adjacent isolation sealing plates 392 to form a solid body, so as to compensate for the stratum loss caused by the excavation of the foundation pit.

[0067] Finally, during the further excavation of the foundation pit, according to the feedback of monitoring data, the solidified bodies in the compartment segment 341 and the bag segment 36 in the relevant area can be liquefied (powered on or heated) to liquefy the solidified bodies, and the slurry can be injected into the bag segment 36 in the area again, and the grouting amount of the compartment segment is specified. The grouting pressure should be adjusted in real time according to the surrounding monitoring data. In this way, the purpose of multiple grouting in sections can be achieved, the stratum loss caused by the foundation pit excavation can be reduced, and the impact on the surrounding environment can be reduced.

[0068] The grouting liquid can be an electrorheological fluid or a hot melt.

[0069] When the grouting liquid is a hot melt agent, it can be a mixture of one or more materials such as asphalt, hot melt adhesive, etc.

[0070] A grouting hole 38 is formed at a predetermined position on the outer surface of the grouting main pipe 34 .

[0071] The outer surface of the grouting hole 38 is wrapped with a check valve 381 to prevent the solidified body wrapped between the grouting main pipe 34 and the bag segment 36 from flowing back after liquefaction.

[0072] The outer surface of the grouting straight-through pipe 32 is provided with a plurality of grout outlet holes 321 .

[0073] The sealing ring on the outer edge of the sealing plate 392 can fit tightly against the inner wall of the grouting main pipe 34 to prevent leakage during grouting.

[0074] If the grouting liquid is an electrorheological fluid, a current conductor is wound around the outer surface of the grouting main pipe 34, and the current conductor has conductive wires extending into the compartment section 341 and the solidified body wrapped by the bag section 36; the current conductor serves as a grouting body liquefaction device 35 for melting the electrorheological fluid.

[0075] If the grouting liquid is a hot melt, a heater is wound around the outer surface of the grouting main pipe 34; the heater serves as a grouting body liquefaction device 35 for melting the hot melt.

[0076] The grouting bag device and the construction method of this embodiment can be used in a variety of scenarios to compensate for the stratum loss caused by foundation pit excavation. The details are as follows:

[0077] See also Figure 7 , in this Figure 7 In the scene shown, the foundation pit project is located near a ground building. The grouting bag device 3 is placed close to the retaining structure 1, and the retaining structure 1 is used as a backing to compensate for the stratum loss caused by the foundation pit excavation.

[0078] See also Figure 8 , in this Figure 8 In the illustrated scenario, the foundation pit project is located near an underground tunnel. The grouting bag device 3 is placed close to the retaining structure 1, and the retaining structure 1 is used as a backing to compensate for the stratum loss caused by the foundation pit excavation.

[0079] See also Fig. 9 , in this Fig. 9 In the scene shown, the foundation pit project is located near a ground building, and the grouting bag device 3 is arranged below the ground building to compensate for the loss of the foundation stratum of the building through multiple segmented grouting.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grouting bag device, the grouting bag device (3) comprising a grouting main pipe (34) and a bag segment (36); Features: A compartment mechanism (39) is provided inside the grouting main pipe (34), and the compartment mechanism (39) divides the internal space of the grouting main pipe (34) into a certain number of independently closed compartment sections (341), and each compartment section (341) corresponds to a bag section (36); For each compartment segment (341), a grouting hole (38) is opened on the grouting main pipe (34), and the grouting hole (38) is connected with the bag segment (36) and the compartment segment (341); Inside the grouting main pipe (34), a grouting straight-through pipe (32) is provided corresponding to each compartment section (341); A grouting body liquefaction device (35) is provided for each bag segment (36) and its corresponding compartment segment (341).

2. The grouting bag device according to claim 1, characterized in that: The compartment separation mechanism (39) comprises a connecting rod (391) and a certain number of sealing plates (392); All the sealing plates (392) are discretely arranged in the grouting main pipe (34), and each sealing plate (392) is horizontally separated in the grouting main pipe (34). All the sealing plates (392) are connected and combined together through a connecting rod (391), and the interval space between two adjacent sealing plates (392) serves as the compartment section (341).

3. The grouting bag device according to claim 2, characterized in that: A sealing ring is provided at the edge of each sealing plate (392).

4. The grouting bag device according to claim 1, characterized in that: A check valve (381) is provided at the grouting hole (38).

5. The grouting bag device according to claim 1, characterized in that: A plurality of grouting holes (321) are provided on each grouting straight-through pipe (32), and the grouting holes (321) are located in the compartment section (341) to which the grouting straight-through pipe (32) belongs.

6. The grouting bag device according to claim 1, characterized in that: The grouting body liquefaction device (35) is a current conductor or a heater.

7. A method for constructing a grouting bag device, wherein the grouting bag device is the grouting bag device (3) according to claim 1; characterized in that: The construction method comprises: Before excavation of the foundation pit, a grouting bag device (3) is arranged between the foundation pit project and the structure to be protected; During the excavation of the foundation pit, according to the monitoring data, grouting liquid is injected into the designated bag segment (36) to form a solidified body; During further excavation of the foundation pit, the solidified bodies in the designated compartment sections (341) and the bag sections (36) are liquefied according to the monitoring data, so that the solidified bodies are liquefied, and grouting liquid is injected into the designated bag sections (36) again.

8. The construction method of the grouting bag device according to claim 7 is characterized in that: The grouting liquid is an electrorheological fluid, and the grouting body liquefaction device (35) adopts an electric current conductor.

9. The construction method of the grouting bag device according to claim 7, characterized in that: The grouting liquid is a hot melt, and the grouting body liquefaction device (35) adopts a heater.

10. The construction method of the grouting bag device according to claim 7, characterized in that: The grouting volume of each compartment is specified, and the grouting pressure is adjusted in real time according to the surrounding monitoring data.

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