Construction device for repeatedly orienting grouting to reinforce foundation

Abstract

The utility model discloses a construction device of repeatable directional grouting reinforced foundation, the construction device includes steel outer tube and core pipe, steel outer tube side wall has established several grouting hole, the core pipe is installed in steel outer tube, the core pipe includes core pipe upper segment, core pipe middle segment and core pipe lower segment, the core pipe upper segment includes upper part out grout flower pipe and is set on the upper part out grout flower pipe lateral wall's upper part annular air bag, the core pipe middle segment is middle part out grout flower pipe, the core pipe lower segment includes lower part out grout flower pipe and is set on the lower part out grout flower pipe lateral wall's lower part annular air bag, the both ends of middle part out grout flower pipe are detachably connected with upper part out grout flower pipe and lower part out grout flower pipe. The utility model has the advantages that: adopt the upper and lower double air bag plugging structure of inflatable, solved the problem of grouting core pipe jam and seal not strict caused by grouting device using stop grout plug.

Description

Technical Field

[0001] This utility model relates to the technical field of building foundation reinforcement and existing building reinforcement, lifting and correction, and in particular to a construction device for repeated directional grouting reinforcement of foundations. Background Technology

[0002] Currently, grouting is widely used in grouting projects. However, grouting generally requires drilling a hole first, then injecting casing material, inserting a grouting pipe, and allowing the casing material to cure for 5-7 days before fracturing and crushing it before grouting can proceed. A fixed grout stop plug is used as a sealing measure for the grouting pipe. This method is limited by site constraints; drilling is restricted when the drilling rig cannot be positioned. Furthermore, the curing time and fracturing strength of the casing material need to be determined through testing based on the geological conditions before construction, resulting in low efficiency and inconvenience from a project timeline perspective. The use of a simple fixed grout stop plug is affected by thermal contraction and the smoothness of the inner wall of the sleeve valve pipe, frequently leading to problems such as grouting pipe jamming and incomplete sealing during construction. Additionally, the fixed length of the sleeve valve pipe, due to the fixed length of the grouting pipe stop plug and the grouting perforated pipe, means that the length of each grouting section is fixed at 33-50cm, and the length of the grouting section cannot be adjusted according to the actual geological conditions. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the existing technology by providing a construction device for repeated directional grouting to reinforce the foundation. This device consists of a steel outer tube and a core tube. The core tube comprises an upper section, a middle section, and a lower section. The upper section includes an upper grout outlet pipe and an upper annular airbag fitted onto the side wall of the upper grout outlet pipe. The middle section is a middle grout outlet pipe. The lower section includes a lower grout outlet pipe and a lower annular airbag fitted onto the side wall of the lower grout outlet pipe. The two ends of the middle grout outlet pipe are detachably connected to the upper and lower grout outlet pipes, respectively. While ensuring grout sealing, the length of the grouting section can be adjusted according to the actual geological conditions.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A construction device for repeated directional grouting to reinforce foundations includes a steel outer tube and a core tube. The outer steel tube has several grouting holes on its sidewall. The core tube is installed inside the outer steel tube and includes an upper section, a middle section, and a lower section. The upper section includes an upper grout outlet pipe and an upper annular airbag fitted onto the sidewall of the upper grout outlet pipe. The middle section is a middle grout outlet pipe. The lower section includes a lower grout outlet pipe and a lower annular airbag fitted onto the sidewall of the lower grout outlet pipe. The two ends of the middle grout outlet pipe are detachably connected to the upper and lower grout outlet pipes, respectively.

[0006] A rubber membrane is provided at the grouting hole, and barbs are provided below the grouting hole.

[0007] The outer steel tube includes a steel tube body, a tube cap, and a pointed end, wherein the tube cap and the pointed end are detachably connected to the top and bottom of the steel tube body, respectively.

[0008] The upper annular airbag is fixed between the first upper protective block and the first lower protective block, and the lower annular airbag is fixed between the second upper protective block and the second lower protective block.

[0009] The lower side wall of the upper slurry outlet pipe, the side wall of the middle slurry outlet pipe, and the upper side wall of the lower slurry outlet pipe are all provided with slurry outlet holes and slurry outlet grooves.

[0010] The upper end of the core tube is connected to the grouting pump through the main grout delivery pipe, and the lower end is sealed by the core tube bottom seal.

[0011] The upper annular airbag and the lower annular airbag are respectively connected to an air pump.

[0012] The air pump is connected to the upper annular airbag and the lower annular airbag via a main air intake pipe, an air intake tee pipe, and an airbag connecting pipe, respectively. The upper end of the vertical pipe of the air intake tee pipe is connected to the air pump via the main air intake pipe, the lower end of the vertical pipe of the air intake tee pipe is connected to the upper annular airbag, the horizontal pipe of the air intake tee pipe is connected to the upper end of the airbag connecting pipe, and the lower end of the airbag connecting pipe is connected to the lower annular airbag.

[0013] The advantages of this utility model are:

[0014] 1. The steel outer pipe is directly driven (pressed) into the soil layer to be reinforced, which solves the limitation of drilling by the drilling machine in grouting reinforcement. At the same time, it solves the problem of the difficulty in determining the strength of the casing material. In addition, the steel outer pipe itself can serve as a rigid material for reinforcing the soil layer.

[0015] 2. The upper and lower double airbag sealing structure with inflatable and deflated features solves the problems of grouting core tube jamming and poor sealing caused by the use of grout stop plugs in the grouting device;

[0016] 3. The use of a telescopic grouting core tube increases the single grouting range within the reinforcement depth range, solves the problem of only being able to grout a fixed length and not being able to achieve grouting in multiple sections within the same soil layer, and improves the efficiency of grouting work.

[0017] 4. By setting barbs and multiple backflow prevention structures, the grout outlet of the steel outer pipe is protected from blockage and backflow, and multiple grouting cycles can be achieved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external appearance of the steel outer tube of this utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of the steel outer tube of this utility model;

[0020] Figure 3 This is a schematic diagram illustrating the arrangement of the rubber membrane of this utility model;

[0021] Figure 4 This is a schematic diagram of the appearance of the core tube of this utility model;

[0022] Figure 5 This is a cross-sectional schematic diagram of the core tube of this utility model;

[0023] Figure 6 This is a schematic diagram of the installation of the construction device for reusable directional grouting to reinforce the foundation according to this utility model;

[0024] like Figures 1-6 As shown in the figure, the markings represent:

[0025] 10. Steel outer pipe, 101. Steel pipe body, 102. Grouting hole, 103. Rubber membrane, 104. Barb, 105. Pipe cap, 106. Point, 20. Core pipe, 201. Upper section of core pipe, 2011. Upper grout outlet pipe, 2012. Upper annular airbag, 2013. First upper protective block, 2014. First lower protective block, 202. Middle section of core pipe, 2021. Middle grout outlet pipe, 203. Lower section of core pipe, 204. 31. Lower annular airbag 2032. Second upper protective block 2033. Second lower protective block 2034. Slurry outlet hole 204. Slurry outlet groove 205. Core tube bottom seal 206. External thread 207. Internal thread 208. Main slurry delivery pipe 30. Slurry delivery valve 301. Main air inlet pipe 40. Air valve 401. Air inlet tee pipe 50. Airbag connecting pipe 60. Upper annular airbag air inlet 70. Lower annular airbag air inlet 80;

[0026] First soil layer a, second soil layer b, third soil layer c. Detailed Implementation

[0027] The features and other related features of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0028] Example: Figures 1-5As shown, this embodiment relates to a construction device for repeated directional grouting to reinforce a foundation. The device mainly includes a steel outer pipe 10, a core pipe 20, an air pump, and a grouting pump. The steel outer pipe 10 includes a steel pipe body 101, a pipe cap 105, and a pointed end 106. The side wall of the steel pipe body 101 has several grouting holes 102. A rubber membrane 103 is provided at each grouting hole 102. The rubber membrane 103 is located on the outer wall of the steel pipe body 101 and can prevent grout from entering the site. The grout flows in reverse, meaning that the grout inside the outer steel pipe 10 squeezes the rubber membrane 103, so that the grout can only flow from inside the outer steel pipe 10 to outside the outer steel pipe 10. A barb 104 (shield-shaped in this embodiment) is welded at a certain distance below the grouting hole 102. The top of the barb 104 is level with or higher than the top of the rubber membrane 103. The barb 104 prevents hard objects from tearing the rubber membrane 103 and also prevents soil from entering the grouting hole 102. The cap 105 and the tip 106 are detachably connected to the top and bottom of the steel pipe body 101, respectively. In this embodiment, the cap 105 and the top of the steel pipe body 101, and the tip 106 and the bottom of the steel pipe body 101 are both threaded connections. The tip 106 facilitates the driving (pressing) of the outer steel pipe 10 into the soil, and the cap 105 seals the top of the outer steel pipe 10. In addition, depending on the usage requirements, multiple steel pipe bodies 101 can be provided, and the steel pipe bodies 101 are also detachably connected (in this embodiment, they are threaded connections) to achieve the extension of the outer steel pipe 10.

[0029] like Figures 4-5As shown, the core tube 20 is installed inside the steel outer tube 10. The core tube 20 includes an upper section 201, a middle section 202, and a lower section 203. The upper section 201 includes an upper slurry outlet tube 2011 and an upper annular airbag 2012 sleeved on the upper side wall of the upper slurry outlet tube 2011. The upper annular airbag 2012 is fixed between a first upper protective block 2013 and a first lower protective block 2014. The first upper protective block 2013 and the first lower protective block 2014 are also sleeved (by means of threading, welding, gluing, etc.) on the side wall of the upper slurry outlet tube 2011. The first upper protective block 2013 and the first lower protective block 2014 are used to limit and fix the upper annular airbag 2012. The middle section 202 is the middle slurry outlet tube 2021. The lower section 203 of the core tube includes a lower slurry outlet tube 2031 and a lower annular airbag 2032 sleeved on the lower side wall of the lower slurry outlet tube 2031. The lower annular airbag 2032 is fixed between the second upper protective block 2033 and the second lower protective block 2034. The second upper protective block 2033 and the second lower protective block 2034 are also sleeved (by means of threading, welding, gluing, etc.) on the lower slurry outlet tube 2031. The second upper protective block 2033 and the second lower protective block 2034 are used to limit and fix the lower annular airbag 2032. The two ends of the middle slurry outlet pipe 202 are detachably connected to the upper slurry outlet pipe 201 and the lower slurry outlet pipe 203, respectively. In this embodiment, the lower end of the upper slurry outlet pipe 201 (with external thread 207) and the upper end of the middle slurry outlet pipe 202 (with internal thread 208), and the lower end of the middle slurry outlet pipe 202 (with external thread 207) and the upper end of the lower slurry outlet pipe 203 (with internal thread 208) are all threadedly connected.The sidewalls of the lower part of the upper slurry outlet pipe 201 (the area without the upper annular airbag 2012, the first upper protective block 2013, and the first lower protective block 2014), the sidewall of the middle slurry outlet pipe 202, and the upper part of the lower slurry outlet pipe 203 (the area without the lower annular airbag 2032, the second upper protective block 2033, and the second lower protective block 2034) are all provided with slurry outlet holes 204 and slurry outlet grooves 205, so that the slurry flows between the outer steel pipe 10 and the core pipe 20. In this embodiment, the slurry outlet holes 204 are arranged in a quincunx pattern, and the slurry outlet grooves 205 are vertical strips. The unthreaded area at the lower part of the upper slurry outlet pipe 201 and the unthreaded area of ​​the middle slurry outlet pipe 202 are also provided. The upper unthreaded area of ​​the core tube 203 and the lower slurry outlet tube 201 are all provided with slurry outlet holes 204. The threaded areas at the bottom of the upper slurry outlet tube 201, the upper and lower threaded areas of the middle slurry outlet tube 202, and the upper threaded area of ​​the lower slurry outlet tube 203 are all provided with slurry outlet grooves 205. The number, position, and size of the slurry outlet grooves 205 at the bottom of the upper slurry outlet tube 201 correspond to the number, position, and size of the slurry outlet grooves 205 at the top of the middle slurry outlet tube 202, and the number, position, and size of the slurry outlet grooves 205 at the bottom of the middle slurry outlet tube 202 correspond to the number, position, and size of the slurry outlet grooves 205 at the top of the lower slurry outlet tube 203. In addition, multiple middle slurry outlet tubes 202 can be provided according to usage requirements, and the middle slurry outlet tubes 202 are detachably connected (in this embodiment, they are threaded connections) to extend the middle section 202 of the core tube.

[0030] The upper end of the core tube 20 is connected to the grouting pump through the main grouting pipe 30, and the lower end is sealed by the core tube bottom seal 206. The grouting pump can inject grout into the core tube 20, and the main grouting pipe 30 is equipped with a grouting valve 301 to control the amount and opening / closing of the grouting. The core tube bottom seal 206 is used to seal the lower end of the core tube 20.

[0031] The upper annular airbag 2012 and the lower annular airbag 2032 are respectively connected to an air pump. The air pump inflates the upper annular airbag 2012 and the lower annular airbag 2032, causing them to fit tightly against the inner wall of the outer steel tube 10, thereby achieving a seal between the upper part of the core tube 20 and the outer steel tube 10, as well as a seal between the lower part of the core tube 20 and the outer steel tube 10. Specifically, the air pump is connected to the upper annular airbag 2012 and the lower annular airbag 2032 through the main air inlet pipe 40, the air inlet tee pipe 50, and the airbag connecting pipe 60, respectively. The upper end of the vertical pipe of the air inlet tee pipe 50 is connected to the air pump through the main air inlet pipe 40. The lower end of the vertical pipe of the air inlet tee pipe 50 is connected to the upper annular airbag 2012 through the upper annular airbag inlet 70. The upper annular airbag inlet 70 passes through the first upper protective block 2013. The horizontal pipe (the end not connected to the vertical pipe) of the air inlet tee pipe 50 passes through the upper slurry outlet pipe 2011 and is connected to the upper end of the airbag connecting pipe 60. The airbag connecting pipe 60 is located inside the core pipe 20. The lower end of the airbag connecting pipe 60 passes through the lower slurry outlet pipe 2031 and is connected to the lower annular airbag 2032 through the lower annular airbag inlet 80. The lower annular airbag inlet 80 passes through the second upper protective block 2033.

[0032] like Figures 1-5 As shown, this embodiment also has the following working principle:

[0033] The grout enters the core tube 20 through the main grout delivery pipe 30, and enters the space between the outer steel tube 10 and the core tube 20 through the grout outlet 204 and the grout outlet groove 205 of the core tube 20 (at this time, the upper annular airbag 2012 and the lower annular airbag 2032 are in close contact with the inner wall of the outer steel tube 10 respectively). The grout squeezes the rubber membrane 103 and flows from the grouting hole 102 to the outer steel tube 10, thereby realizing the grouting reinforcement of the soil layer.

[0034] like Figures 1-6 As shown, this embodiment also includes the following construction methods:

[0035] Connect the tip 106 to the lower end of the outer steel tube 10, and drive the outer steel tube 10 into the soil layer that needs grouting reinforcement using static pressure or vibration (in this embodiment, the outer steel tube 10 is driven into the first soil layer a, the second soil layer b, and the third soil layer c, where the second soil layer b is the soil layer that needs reinforcement). Determine the length of the core tube 20 according to the thickness of the soil layer that needs reinforcement, assemble the core tube 20 to the target length, and connect the main grouting pipe 30 and the main air inlet pipe 40. Unscrew the cap 105, insert the core tube 20 into the outer steel tube 10, and lower it to the bottom of the outer steel tube 10 (if there are minor defects or deformations that occur during the processing and driving of the outer steel tube 10, the core tube 20 can be repeatedly inserted into the outer steel tube 10, and the upper and lower protective blocks can be used to clear the blockage, making it easier for the core tube 20 to continue to be lowered and removed). Then slowly lift it up to the target reinforcement depth. Then, open air valve 401 and turn on the air compressor to inflate the upper and lower annular airbags. After the airbags are fully inflated, close air valve 401, lock the position of core tube 20, open grout delivery valve 301, and adjust the grouting pressure and grouting speed to perform directional, constant-pressure, and quantitative grouting on the target soil layer. Grouting can be done in a single or multiple sessions. After a single-segment grouting is completed, first close grout delivery valve 301, then open air valve 401 to deflate the airbags. Adjust the length of core tube 20 or raise its position inside the steel outer tube 10 according to the position and length of the next grouting segment. Repeat the above operation to complete the single-point grouting work from bottom to top and remove core tube 20 (grouting from bottom to top can reduce residual cement slurry inside the steel outer tube 10). Clean the inside of the steel outer tube 10 and fill it with clean water. Tighten the cap 105 to seal the steel outer tube 10. Then, move to the next point as needed and repeat the above steps until the foundation reinforcement and jacking correction work of the target area is completed. If further foundation reinforcement or jacking correction is required, the cap 105 can be opened and the aforementioned operation repeated to complete the reinforcement or jacking correction work.

[0036] The beneficial technical effects of this embodiment are as follows:

[0037] 1. The steel outer pipe is directly driven (pressed) into the soil layer to be reinforced, which solves the limitation of drilling by the drilling machine in grouting reinforcement. At the same time, it solves the problem of the difficulty in determining the strength of the casing material. In addition, the steel outer pipe itself can serve as a rigid material for reinforcing the soil layer.

[0038] 2. The upper and lower double airbag sealing structure with inflatable and deflated features solves the problems of grouting core tube jamming and poor sealing caused by the use of grout stop plugs in the grouting device;

[0039] 3. The use of a telescopic grouting core tube increases the single grouting range within the reinforcement depth range, solves the problem of only being able to grout a fixed length and not being able to achieve grouting in multiple sections within the same soil layer, and improves the efficiency of grouting work.

[0040] 4. By setting barbs and multiple backflow prevention structures, the grout outlet of the steel outer pipe is protected from blockage and backflow, and multiple grouting cycles can be achieved.

[0041] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A construction device for repeated directional grouting to reinforce foundations, characterized in that... The construction device includes an outer steel pipe and a core pipe. The outer steel pipe has several grouting holes on its sidewall. The core pipe is installed inside the outer steel pipe and includes an upper section, a middle section, and a lower section. The upper section includes an upper grouting tube and an upper annular airbag sleeved on the sidewall of the upper grouting tube. The middle section is a middle grouting tube. The lower section includes a lower grouting tube and a lower annular airbag sleeved on the sidewall of the lower grouting tube. The two ends of the middle grouting tube are detachably connected to the upper grouting tube and the lower grouting tube, respectively.

2. The construction device for repeated directional grouting reinforcement of foundations as described in claim 1, characterized in that... A rubber membrane is provided at the grouting hole, and barbs are provided below the grouting hole.

3. The construction device for repeated directional grouting reinforcement of foundations as described in claim 1, characterized in that... The outer steel tube includes a steel tube body, a tube cap, and a pointed end, wherein the tube cap and the pointed end are detachably connected to the top and bottom of the steel tube body, respectively.

4. The construction device for repeated directional grouting reinforcement of foundations as described in claim 1, characterized in that... The upper annular airbag is fixed between the first upper protective block and the first lower protective block, and the lower annular airbag is fixed between the second upper protective block and the second lower protective block.

5. The construction device for repeated directional grouting reinforcement of foundations as described in claim 1, characterized in that... The lower side wall of the upper slurry outlet pipe, the side wall of the middle slurry outlet pipe, and the upper side wall of the lower slurry outlet pipe are all provided with slurry outlet holes and slurry outlet grooves.

6. The construction device for repeated directional grouting reinforcement of foundations as described in claim 1, characterized in that... The upper end of the core tube is connected to the grouting pump through the main grout delivery pipe, and the lower end is sealed by the core tube bottom seal.

7. The construction device for repeated directional grouting reinforcement of foundations as described in claim 1, characterized in that... The upper annular airbag and the lower annular airbag are respectively connected to an air pump.

8. The construction device for repeated directional grouting reinforcement of foundations as described in claim 7, characterized in that... The air pump is connected to the upper annular airbag and the lower annular airbag via a main air intake pipe, an air intake tee pipe, and an airbag connecting pipe, respectively. The upper end of the vertical pipe of the air intake tee pipe is connected to the air pump via the main air intake pipe, the lower end of the vertical pipe of the air intake tee pipe is connected to the upper annular airbag, the horizontal pipe of the air intake tee pipe is connected to the upper end of the airbag connecting pipe, and the lower end of the airbag connecting pipe is connected to the lower annular airbag.

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