Capsule pipe structure for subgrade grouting lifting

Abstract

This utility model discloses a bladder-tube structure for roadbed grouting and lifting. The bladder-tube structure is installed in a transverse borehole of the roadbed. The bladder-tube structure includes a bladder tube and a grouting pipe. One end of the bladder tube is closed, and the other end is sealed and fixedly connected to the grouting pipe. One end of the grouting pipe extends into the bladder tube, and the other end extends out of the bladder tube. The bladder tube includes a grouting section and two open sections respectively located at both ends of the grouting section. The size of the grouting section is larger than the size of the open sections. One of the open sections is sealed by binding with wire, and the other open section is sleeved on the outer wall of the grouting pipe and bound with wire. The grouting pipe has a groove at the wire binding position. The advantages of this utility model are: simple structure and convenient operation; by injecting grout into the grouting pipe of the bladder-tube structure, the bladder tube of the bladder-tube structure expands, thereby achieving the lifting of the roadbed.

Description

Technical Field

[0001] This utility model relates to the technical field of roadbed engineering, and in particular to a bladder structure for roadbed grouting and lifting. Background Technology

[0002] Compared to bridges or tunnels, roadbeds have a significant cost advantage, making them the preferred option in railway and highway design. In existing railway and highway projects, the mileage of roadbeds is generally much greater than that of bridges and tunnels. Because roadbeds are geotechnical structures constructed from soil fill, newly filled roadbeds are in a partially consolidated state, inevitably leading to settlement under the long-term effects of vehicle loading and unloading. Due to variations in soil properties, fill thickness, fill quality, groundwater level, and foundation along the longitudinal direction of the roadbed, as well as the influence of other structures along the line, such as culverts, bridges, and stations, uneven settlement is likely to occur after the roadbed is put into operation. This affects the smoothness of the pavement (highway roadbed) or track (railway roadbed), leading to greater dynamic loads from traffic. These greater dynamic loads increase the amplitude and depth of dynamic stress in the roadbed, resulting in accelerated settlement and ultimately creating a vicious cycle. Therefore, it is necessary to promptly address uneven settlement in the roadbed.

[0003] In existing subgrade unevenness treatment processes, grouting and lifting have become the preferred solution to avoid affecting the pavement structure (highway subgrade) or track structure (railway subgrade). However, existing grouting and lifting methods, which involve directly injecting grout into the stratum, are prone to grout leakage, resulting in very limited additional soil pressure and unsatisfactory lifting effects. Furthermore, the direction of the compressive force generated by grouting is uncontrollable, easily leading to soil cracking on both sides of the subgrade or lateral deformation. Direct grouting also easily results in uneven distribution of additional stratum stress, leading to poor uniformity of pavement or track lifting. Overall, the deformation from existing direct grouting and lifting methods for subgrades is uncontrollable and easily induces secondary defects. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of the prior art by providing a bladder structure for roadbed grouting and lifting. This bladder structure consists of a bladder and a grouting pipe. One end of the bladder is closed, and the other end is sealed and fixedly connected to the grouting pipe. One end of the grouting pipe extends into the bladder and the other end extends out of the bladder. This bladder structure is installed in a transverse borehole in the roadbed. By injecting grout into the grouting pipe of the bladder structure, the bladder expands, thereby lifting the roadbed.

[0005] The objective of this utility model is achieved through the following technical solution: A grouting and lifting tube structure for roadbed is disclosed. The grouting tube structure is installed in a transverse borehole of the roadbed. The grouting tube structure includes a grouting tube and a grouting pipe. One end of the grouting tube is closed, and the other end is sealed and fixedly connected to the grouting pipe. One end of the grouting pipe extends into the grouting tube, and the other end extends out of the grouting tube. The grouting tube includes a grouting section and two open sections respectively located at both ends of the grouting section. The size of the grouting section is larger than the size of the open sections. One of the open sections is sealed by binding with wire, and the other open section is sleeved on the outer wall of the grouting pipe and bound with wire. The grouting pipe has a groove at the wire binding position.

[0006] One end of the grouting pipe extends to the middle position inside the bladder tube.

[0007] The length of the bladder tube is less than the length of the transverse borehole in the roadbed.

[0008] Multiple transverse boreholes are arranged at longitudinal intervals along the roadbed.

[0009] The tube is composed of a braided layer and an inner lining layer. The braided layer is made of polypropylene fibers woven into a tubular structure, and the inner lining layer is a polyethylene layer disposed on the inner wall of the braided layer.

[0010] The advantages of this utility model are: simple structure and convenient operation; by injecting grout into the grouting pipe of the bladder structure, the bladder of the bladder structure expands, thereby raising the roadbed. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the pre-grouting bladder tube structure of this utility model; Figure 2 This is a schematic diagram of the roadbed drilling method of this utility model; Figure 3 This is a schematic diagram showing the placement of the capsule structure of this utility model; Figure 4 This is a schematic diagram of the roadbed grouting method of this utility model; Figure 5 This is a schematic diagram of the grouting tube structure of this utility model; Figure 6 for Figure 5 Enlarged view of A in the middle; Figure 7 for Figure 5 Enlarged view of B in the middle; like Figures 1-7 As shown in the figure, the labels represent: The components include: 10 (bladder structure), 101 (bladder tube), 1011 (grouting section), 1012 (first opening section), 1013 (second opening section), 102 (grouting pipe), 103 (first iron wire), 104 (second iron wire), 20 (plain round steel bar), 30 (roadbed), 301 (transverse borehole), 40 (auger drill), 50 (steel cylinder), 60 (grouting machine), and 70 (grout). Detailed Implementation

[0012] 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: Example: Figures 1-7 As shown, this embodiment relates to a bladder structure for roadbed grouting and lifting. The bladder structure 10 is installed in a transverse borehole 301 of the roadbed 30. The installation depth of the bladder structure 10 is 1.2 to 1.5 m from the surface of the roadbed 30. Multiple transverse boreholes 301 are arranged at intervals along the longitudinal direction of the roadbed 30. The spacing between the transverse boreholes 301 is 3 to 6 times the diameter of the bladder structure 10 (bladder 101) when it is fully saturated. This ensures the lifting effect while preventing mutual interference between the bladder structures 10. The diameter of the bladder structure 10 (bladder 101) when it is fully saturated is determined according to the expected lifting amount of the roadbed 30, which is approximately 15 cm plus 10 to 15 times the expected lifting amount.

[0013] The bladder structure 10 includes a bladder 101 and a grouting pipe 102. The bladder 101 consists of a braided layer and an inner lining layer. The braided layer is made of polypropylene fiber to form a tubular structure, and the inner lining layer is a polyethylene layer placed on the inner wall of the braided layer, providing high strength and waterproofing. One end of the bladder 101 is closed, and the other end is sealed and fixedly connected to the grouting pipe 102. One end of the grouting pipe 102 extends into the bladder 101, and the other end extends out of the bladder 101. In this embodiment, one end of the grouting pipe 102 extends to the middle position inside the bladder 101, which facilitates the rapid and uniform filling of the bladder 101 with grout 70. The grouting pipe 102 is connected to a grouting machine 60. The grouting machine 60 injects grout 70 into the bladder 101 through the grouting pipe 102, causing the bladder 101 to expand, thereby lifting the roadbed 30. The length of the bladder tube 101 is 40cm shorter than the length of the transverse borehole 301 of the roadbed 30, which ensures that the lifting force is evenly transmitted to both sides of the roadbed 30 and prevents the end of the bladder tube 101 from squeezing and damaging the slope of the roadbed 30. The bladder tube 101 includes a grouting section 1011 and two open sections respectively located at both ends of the grouting section 1011, namely the first open section 1012 and the second open section 1013. One of the open sections (the first open section 1012) is sealed by binding with the first iron wire 103, and the other open section (the second open section 1013) is sleeved on the outer wall of the grouting tube 102 and bound with the second iron wire 104. The grouting tube 102 has a groove (not shown) at the binding position of the second iron wire 104, which effectively prevents the bladder tube 101 from falling off during the grouting process and ensures the sealing and fixation between the grouting tube 102 and the second open section 1013 of the bladder tube 101. The size / length of the grouting section 1011 is greater than the size / length of the second opening section 1013, and the size / length of the second opening section 1013 is greater than the size / length of the first opening section 1012. In this embodiment, the length of the second opening section 1013 (the horizontal length of the second wire 104) is 5~20cm, and the length of the first opening section 1012 (the horizontal length of the first wire 103) is 5~15cm.

[0014] like Figures 1-7 As shown, this embodiment also includes the following construction methods: (1) Conduct an assessment and analysis of the area affected by settlement to determine the range that needs to be lifted and the corresponding lifting target.

[0015] (2) Install the tube structure 10 within the area of ​​the roadbed 30 that needs to be raised. Specifically, use a steel cylinder 50 with an outer diameter of 4 cm for wall protection, drill horizontally, and simultaneously use a spiral drill 40 to remove soil to form a transverse borehole 301. Before installing the tube structure 10, insert a 10 mm diameter plain round steel bar 20 through the grouting pipe 102 (one end of the plain round steel bar 20 passes through the grouting pipe 102 and abuts against the closed end of the tube 101, and the other end extends to the outside of the tube 101), and evenly tighten the tube structure 10 (tube 101) with plastic wrap. After drilling is completed, remove the steel cylinder 50, and push the prepared tube structure 10 into the transverse borehole 301 through the plain round steel bar 20. Finally, remove the plain round steel bar 20, and fill the gap between the transverse borehole 301 and the grouting pipe 102 with soil until it is compacted.

[0016] (3) All the bladder tube structures 10 are grouped into groups of 5 to 10 bladder tube structures 10. Each group of bladder tube structures 10 is connected by an independent grouting machine 60. The bladder tube structures 10 in the same group are connected in parallel, and each bladder tube structure 10 (grouting pipe 102) is equipped with a ball valve.

[0017] (4) During grouting, vertical displacement monitoring displacement gauges are installed on the surface of the roadbed 30 within the range of the installed bladder structure 10, or a total station is used to perform laser scanning to monitor vertical deformation.

[0018] (5) When the roadbed 30 is grouted and raised, all the tube structures 10 are grouted at the same time. The grout 70 is cement-clay grout, the setting time is controlled at 10~15 hours, and the vertical displacement of the roadbed 30 surface is obtained in real time.

[0019] (6) When the lifting amount of a certain section reaches the set target value, the corresponding ball valve is turned off; when the surface of the roadbed 30 corresponding to the group of bladder structures 10 has reached the lifting target, the grouting machine 60 of the group is turned off and the ball valve of the group of bladder structures 10 is turned off.

[0020] (7) After cleaning the grouting machine 60, add bentonite slurry into the grouting machine 60, and open the ball valve of the bladder structure 10 again. Then, inject 2-3 kg of bentonite slurry into the bladder structure 10 through the ball valve quick connection joint (the purpose is to prevent the cement slurry in the ball valve from solidifying and causing the ball valve to become unusable). Then, close the ball valve of the bladder structure 10 again.

[0021] (8) About 18 to 24 hours after the bentonite grout is injected, the ball valve is turned off for recovery (at this time, the cement grout in the bladder tube structure 10 has solidified and will no longer flow out along the grouting pipe 102).

[0022] (9) Clean up the site and complete the grouting and lifting of the roadbed 30.

[0023] The beneficial technical effects of this embodiment are: simple structure and convenient operation; by injecting grout into the grouting pipe of the bladder structure, the bladder of the bladder structure expands, thereby achieving the lifting of the roadbed.

[0024] 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 bladder-tube structure for roadbed grouting and lifting, characterized in that... The bladder tube structure is installed in the transverse borehole of the roadbed. The bladder tube structure includes a bladder tube and a grouting pipe. One end of the bladder tube is closed, and the other end is sealed and fixedly connected to the grouting pipe. One end of the grouting pipe extends into the bladder tube, and the other end extends out of the bladder tube. The bladder tube includes a grouting section and two open sections respectively located at both ends of the grouting section. The size of the grouting section is larger than the size of the open sections. One of the open sections is sealed by binding with wire, and the other open section is sleeved on the outer wall of the grouting pipe and bound with wire. The grouting pipe has a groove at the wire binding position.

2. The bladder structure for roadbed grouting and lifting as described in claim 1, characterized in that... One end of the grouting pipe extends to the middle of the inside of the bladder tube.

3. The bladder structure for roadbed grouting and lifting as described in claim 1, characterized in that... The length of the bladder tube is less than the length of the transverse borehole in the roadbed.

4. The bladder-tube structure for roadbed grouting and lifting as described in claim 1, characterized in that... The transverse boreholes are arranged at longitudinal intervals along the roadbed.

5. The bladder-tube structure for roadbed grouting and lifting as described in claim 1, characterized in that... The tube consists of a braided layer and an inner lining layer. The braided layer is made of polypropylene fibers woven into a tubular structure, and the inner lining layer is a polyethylene layer disposed on the inner wall of the braided layer.

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