Method for connecting channel steel segments with embedded orifice pipes by freezing and construction method thereof

Abstract

The application discloses a frozen method connecting channel steel pipe piece pre-buried orifice pipe and a construction method thereof. The frozen method connecting channel steel pipe piece pre-buried orifice pipe comprises a pre-buried pipe pre-buried in a pipe piece main body and used for penetrating a frozen pipe, wherein the pre-buried pipe is pre-penetrated in the pipe piece main body along the thickness direction of the pipe piece main body. In the application, the pre-buried pipe is pre-buried in the pipe piece main body, when the frozen construction is performed, the pipe piece does not need to be damaged on site when drilling, and only the frozen hole is drilled into the soil through the pre-buried pipe, and the frozen pipe is penetrated into the frozen hole, so that the frozen method construction can be realized. The construction process is simple and fast, the structure of the pipe piece does not need to be damaged in the drilling process, and the pre-buried position of the pre-buried pipe is adapted to the opening angle of the frozen hole, so that the drilling precision is higher.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction, specifically to a freezing method for connecting pre-embedded orifice pipes of steel pipe segments in tunnels and its construction method. Background Technology

[0002] With the development of urbanization in my country, underground space has broad prospects and significant strategic importance. Currently, conventional underground connecting passages adopt a combination of freezing and mining methods for excavation. Freezing construction technology, with its advantages of adapting to complex geological conditions, high construction precision, and minimal environmental impact, is widely used in underground engineering projects such as subway tunnels, municipal utility tunnels, and deep drainage networks. This involves using horizontal and partially inclined boreholes within the tunnel to freeze and reinforce the surrounding strata, freezing the soil in the excavation area of ​​the connecting passage and pump house to form a high-strength, well-sealed frozen curtain. The mining method is then used to excavate and construct the connecting passage and pump house within the reinforced frozen soil.

[0003] Statistics show that in domestic tunnel construction projects using the freezing method, approximately 30% of accidents stem from defects in the freezing hole construction or loss of control during the freezing process. Existing freezing methods present the following problems: Traditional freezing methods require drilling holes in existing steel segments; the drilling positioning and accuracy are affected by the segment structure, resulting in limited drilling positions, hole deviations, and decreased accuracy; the drilling process requires changing core drill bits to drill through the inner and outer curved surfaces of the steel segments, making the process cumbersome; on-site drilling of steel segments can damage the segment's ribs, reducing its load-bearing capacity; and on-site drilling often faces challenges in ensuring construction quality due to limited operating space within the tunnel, easily creating weak points, making the construction complex, time-consuming, and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide a pre-embedded orifice pipe for connecting steel pipe segments in a freezing method and its construction method. During freezing construction, there is no need to damage the pipe segments on-site during drilling. Freezing holes are drilled into the soil through the pre-embedded pipe, and the freezing pipe is inserted into the freezing holes to realize the freezing construction method. The construction process is simple and quick. The drilling process does not require damage to the structure of the pipe segments, nor does it require replacement of the core drill bit. Moreover, the pre-embedded position of the pre-embedded pipe is adapted to the opening angle of the freezing hole, so the drilling accuracy is higher.

[0005] To achieve the aforementioned objective, the present invention provides a freezing method for connecting channel segments, comprising: a pre-embedded pipe embedded in the segment body for the freezing pipe to pass through, wherein the pre-embedded pipe is pre-penetrated through the segment body along the thickness direction of the segment body.

[0006] A further improvement of the present invention is that a plug is detachably installed on the portion of the pre-embedded pipe near the inner side of the pipe segment body.

[0007] A further improvement of the present invention is that the portion of the pre-embedded pipe near the inner side of the pipe segment body includes a narrow section and a flared section fixed to the narrow section near the inner side of the pipe segment body. The inner diameter of the flared section is larger than the outer diameter of the narrow section. The end cap is detachably installed on the narrow section. The flared section surrounds an operating space for installing and removing the end cap.

[0008] A further improvement of the present invention is that an isolation plate is fixed inside the pre-embedded pipe, and a filling space is formed between the end of the pre-embedded pipe near the outer side of the pipe segment body and the isolation plate, and the filling space is filled with a drillable filler.

[0009] A further improvement of the present invention is that the pre-embedded pipe includes an inner pipe section and an outer pipe section coaxially connected. The outer pipe section is fixed to one end of the inner pipe section near the outer side of the pipe segment body. The inner wall of the outer pipe section is attached to and fixed to the outer wall of the inner pipe section. The inner wall of the outer pipe section and the outer end face of the inner pipe section together form a stepped surface for the installation of the isolation plate.

[0010] A further improvement of the present invention is that at least one rib is pre-embedded in the main body of the segment, and at least one of the ribs is staggered from the pre-embedded pipe.

[0011] This invention discloses a construction method based on freezing, comprising the following steps: S1. Assemble the aforementioned main tunnel segments into the tunnel; S2. The drill bit passes through the pre-embedded pipe through the main body of the pipe segment and drills a hole in the soil outside the main body of the pipe segment to form a freezing hole in the soil for the freezing pipe to pass through. S3. Pass the freezing pipe through the pre-embedded pipe and insert it into the freezing hole to carry out the freezing method construction and form a frozen wall. S4. Under the protection of the frozen wall, the connecting channel is excavated.

[0012] A further improvement of the present invention is that a plug is detachably installed at one end of the pre-embedded pipe near the inner side of the pipe segment body. After performing step S1 and before performing step S2, the plug is removed. After performing step S3, the exposed part of the freezing pipe is cut off and the pre-embedded pipe is filled and sealed. Then the plug is reinstalled to seal the pre-embedded pipe.

[0013] A further improvement of the present invention is that a segment sealing plate is provided, which, after the end cap is reinstalled, seals the inner arc surface of the segment body corresponding to the pre-embedded pipe with the segment sealing plate and fills the gap between the segment sealing plate and the end cap.

[0014] A further improvement of the present invention is that an isolation plate and a filler are provided. Before performing step S1, the isolation plate is installed in the pre-embedded pipe, and a filling space is formed between the end of the buried pipe near the outer side of the pipe segment body and the isolation plate, and the filler is filled in the filling space. When performing step S2, the isolation plate is broken through by a drill bit and the filler is passed through.

[0015] The purpose of this invention is to provide a pre-embedded orifice pipe for connecting steel pipe segments in a freezing method. During freezing construction, there is no need to damage the pipe segments on-site during drilling. Freezing holes are drilled into the soil through the pre-embedded pipe, and the freezing pipe is inserted into the freezing holes to realize the freezing method construction. The construction process is simple and quick. The drilling process does not require damage to the structure of the pipe segments, and the pre-embedded position of the pre-embedded pipe is adapted to the opening angle of the freezing hole, so the drilling accuracy is higher. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the interior of the pre-embedded pipe of the present invention; Figure 2 This is a cross-sectional view of the interior of the main body of the pipe segment of the present invention. Figure 1 ; Figure 3 This is a cross-sectional view of the interior of the main body of the pipe segment of the present invention. Figure 2 ; Figure 4 This is a cross-sectional view of the interior of the main body of the pipe segment of the present invention. Figure 3 ; Figure 5 This is a top view of the main body of the tunnel segment of the present invention; Figure 6 This is a schematic diagram of the freezing construction stage of the present invention; Figure 7 This is a schematic diagram of the tube after sealing according to the present invention; 1. Embedded pipe; 101. Flared section; 102. Narrow section; 103. Outer pipe section; 2. Main body of the segment; 21. Rib plate; 3. End cap; 4. Isolation plate; 5. Filler; 6. Waterproof gasket; 71. First thread; 72. Second thread; 8. Outer pipe; 9. Freezing pipe; 10. Sulfoaluminate micro-expansion cement; 11. Segment sealing plate; 12. Cement mortar. Detailed Implementation

[0017] like Figure 1 As shown, the present invention provides a pre-embedded orifice pipe for connecting steel pipe segments using a freezing method, comprising: a pre-embedded pipe 1 pre-embedded within the main body 2 of the pipe segment for the freezing pipe to pass through, wherein the pre-embedded pipe is pre-penetrated through the main body 2 of the pipe segment along the thickness direction of the main body 2 of the pipe segment.

[0018] Preferably, in this embodiment, when pre-embedding the pre-embedded pipe 1, the burial position and angle of the pre-embedded pipe 1 are designed according to the position and angle of the freezing hole during actual construction, ensuring that the angle of the freezing hole meets the construction requirements and improving the quality of subsequent freezing construction.

[0019] like Figure 1 , Figure 2 As shown, the portion of the pre-embedded pipe 1 near the inner side of the pipe segment body 2 is detachably fitted with a plug 3.

[0020] The present invention seals the pre-embedded pipe 1 by setting a plug 3 at the pre-embedded pipe 1 before freezing construction.

[0021] like Figures 1-7 As shown, the portion of the pre-embedded pipe 1 near the inner side of the pipe segment body includes a narrow section 102 and a flared section 101 fixed to the narrow section 102 near the inner side of the pipe segment body 2. The inner diameter of the flared section 101 is larger than the outer diameter of the narrow section 102. The end cap 3 is detachably installed on the narrow section 102. The flared section 101 encloses an operating space for installing and removing the end cap 3.

[0022] Preferably, in this example, the end of the narrow section 102 is provided with a first thread 71, and the outer wall of the plug 3 is provided with an external thread that matches the internal thread. The plug 3 is detachably installed on the narrow section 102 by means of a threaded connection.

[0023] like Figures 1-7 As shown, an isolation plate 4 is fixed inside the pre-embedded pipe 1. A filling space is formed between the end of the pre-embedded pipe 1 near the outer side of the pipe body 2 and the isolation plate 4. The filling space is filled with filler material 5.

[0024] In this embodiment, the filler 5 is made of concrete, and the isolation plate 4 is made of high-density polyethylene board. By filling with filler 5, external soil or water can be prevented from entering the pre-embedded pipe 1 after the main body of the pipe segment 2 is installed. At the same time, filling with a certain amount of filler 5 can also enhance the bearing capacity of the main body of the pipe segment 2. Meanwhile, the isolation plate 4 is set to isolate the filler 5.

[0025] Preferably, in this embodiment, as Figure 1 As shown, the inner wall of the pre-embedded pipe 1 corresponding to the filling space is provided with a second thread 72. By providing the second thread 72 on the inner wall of the filling space, the inner wall of the filling space forms a rough surface, which enhances the interaction force between the inner wall of the pre-embedded pipe 1 and the internal filler 5. Furthermore, since the inner wall is a rough surface formed by the second thread 72, it is more difficult for external water to penetrate into the pre-embedded pipe 1 through the gap between the filler 5 and the inner wall of the pre-embedded pipe 1, thereby enhancing the overall waterproof performance.

[0026] like Figures 1-7As shown, in this embodiment, the pre-embedded pipe 1 includes an inner pipe section and an outer pipe section 12 coaxially connected. The outer pipe section 12 is fixed to one end of the inner pipe section near the outer side of the pipe body 2. The inner wall of the outer pipe section 12 is attached to and fixed to the outer wall of the inner pipe section. The inner wall of the outer pipe section and the outer end face of the inner pipe section together form a stepped surface for the installation of the isolation plate 4.

[0027] In this embodiment, the inner wall of the outer pipe section 13 is adapted to the size of the isolation plate 4. By forming a stepped surface, one side of the isolation plate 4 can abut against the outer end face of the inner pipe section, and the periphery of the isolation plate 4 abuts against and is fixed to the inner wall of the outer pipe section, which facilitates the installation and fixation of the isolation plate 4.

[0028] Preferably, in this embodiment, as Figure 1 As shown, the pre-embedded pipe 1 in this embodiment is divided into three sections. The innermost section of the pipe body 2 is the flared section 101, the outermost section is the outer pipe section 103, and the middle end is the narrow section 102. In this embodiment, the narrow section 102 and the inner pipe section are the same section. During the prefabrication process, the flared section 101, the narrow section 102 and the outer pipe section 103 are welded together.

[0029] like Figure 2 As shown, at least one rib is pre-embedded in the segment body 2. At least one rib 21 is staggered from the pre-embedded pipe 1. When prefabricating the segment body 2, it is ensured that the pre-embedded pipe 1 and the rib 21 are staggered to ensure that the drill bit will not damage the rib 21 in the segment 2 when opening the freezing hole, and to ensure the bearing capacity of the rib 21.

[0030] like Figure 1 , Figure 6 , Figure 7 The accompanying construction method shown includes the following steps: S1. Assemble the aforementioned main tunnel segments into the tunnel; S2. The drill bit passes through the pre-embedded pipe 1 through the pipe segment body 2 and drills a hole in the soil outside the pipe segment body 2 to form a freezing hole in the soil for the freezing pipe 9 to pass through. S3. Pass the freezing pipe 9 through the pre-embedded pipe 1 and insert it into the freezing hole to carry out the freezing method construction and form a frozen wall. S4. Excavate the connecting passage under the protection of the frozen wall.

[0031] like Figure 1 , Figure 7 As shown, a plug 3 is detachably installed at one end of the pre-embedded pipe 1 near the inner side of the pipe body 2. After performing step S1 and before performing step S2, the plug 3 is removed. After performing step S3, the exposed part of the freezing pipe is cut off and the pre-embedded pipe 1 is filled and sealed. Then the plug 3 is reinstalled to seal the pre-embedded pipe 1.

[0032] Preferably, in this embodiment, after step S1 and before step S2, an outer pipe 8 is connected to the inner end of the pre-embedded pipe 1. The surface of the outer pipe 8 is provided with an external thread that matches the first thread 71. The outer pipe 8 is detachably connected by a threaded connection. The extension direction of the outer pipe 8 is consistent with the drilling direction, and the inner diameter of the outer pipe 8 is slightly larger than the drilling face of the drill bit, so as to guide the drilling of the drill bit and improve the accuracy of drilling the freezing hole.

[0033] Preferably, in this embodiment, cement mortar 12 is used to fill the embedded pipe 1.

[0034] Preferably, in this embodiment, the waterproof gasket 6 is installed simultaneously when the plug 3 is reinstalled.

[0035] like Figure 7 As shown, in this embodiment, a segment sealing plate 11 is also provided. After the end cap 3 is reinstalled, the segment sealing plate 11 is used to seal the inner arc surface of the segment body 2 corresponding to the pre-embedded pipe 1, and to fill the gap between the segment sealing plate 11 and the end cap 3.

[0036] In this embodiment, sulfoaluminate micro-expansion cement 10 is used to fill the gap between the pipe segment sealing plate 11 and the end cap 3.

[0037] Preferably, in this embodiment, before performing step S1, the main body of the pipe segment is subjected to non-destructive testing and water tightness testing.

[0038] Preferably, in this embodiment, before performing step S1, an isolation plate 4 is installed inside the pre-embedded pipe 1, and filler material 5 is filled in the isolation space. When performing step S2, the drill bit directly breaks through the isolation plate 4 and passes through the filler material 5.

[0039] The present invention has the following beneficial effects: 1. Before processing the main body 2 of the tunnel segment, the position of the pre-embedded pipe 1 is placed in conjunction with the special design for freezing. During the tunnel segment processing stage, the rib plate 21 can be adjusted according to the special design for the placement position to avoid the pre-embedded pipe 1 and avoid damage to the tunnel segment structure. 2. Pre-embedding allows for high-precision welding of the pre-embedded pipe 1 to the periphery of the pipe segment body 2 in the processing plant, and enables weld flaw detection and water tightness testing after welding to ensure waterproof reliability; 3. Traditional drilling angle deviations are often too large due to limitations in site space and equipment, failing to meet the specific design requirements for freezing. This necessitates compensating for the angle deviation by extending the active freezing time. Pre-embedded pipes allow for high-precision control of freezing hole placement deviations within the processing plant, effectively controlling the angle deviation. 4. By pre-embedding the pipe, only the isolation plate and filler material need to be passed through during drilling. This avoids the need to replace the core drill bit on site when drilling through the outer arc steel plate of the steel pipe segment. This not only greatly reduces construction risks and improves the overall drilling quality, but also saves drilling time and generates economic benefits.

[0040] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for connecting pre-embedded orifice pipes in steel pipe segments via freezing, characterized in that, include: An embedded pipe is pre-embedded in the main body of the segment for the freezing pipe to pass through. The embedded pipe is pre-embedded in the main body of the segment along the thickness direction of the segment.

2. The pre-embedded orifice pipe of the steel pipe segment connection channel by freezing method as described in claim 1, characterized in that, The portion of the pre-embedded pipe near the inner side of the pipe segment body is detachably fitted with a plug.

3. The pre-embedded orifice pipe of the steel pipe segment connection channel as described in claim 2, characterized in that, The portion of the pre-embedded pipe near the inner side of the segment body includes a narrow section and a flared section fixed to the narrow section near the inner side of the segment body. The inner diameter of the flared section is larger than the outer diameter of the narrow section. The end cap is detachably installed on the narrow section. The flared section encloses an operating space for installing and removing the end cap.

4. The pre-embedded orifice pipe of the steel pipe segment connection channel by freezing method as described in claim 1, characterized in that, An isolation plate is fixed inside the pre-embedded pipe. A filling space is formed between the end of the pre-embedded pipe near the outer side of the pipe segment body and the isolation plate. The filling space is filled with a drillable filler.

5. The pre-embedded orifice pipe of the steel pipe segment connection channel by freezing method as described in claim 4, characterized in that, The pre-embedded pipe includes an inner pipe section and an outer pipe section connected coaxially. The outer pipe section is fixed to one end of the inner pipe section near the outer side of the pipe segment body. The inner wall of the outer pipe section is attached to and fixed to the outer wall of the inner pipe section. The inner wall of the outer pipe section and the outer end face of the inner pipe section together form a stepped surface for the installation of the isolation plate.

6. The pre-embedded orifice pipe of the steel pipe segment connection channel by freezing method as described in claim 1, characterized in that, At least one rib is pre-embedded in the main body of the segment, and at least one of the ribs is staggered from the pre-embedded pipe.

7. A construction method based on freezing, characterized in that, Includes the following steps: S1. Assemble the main body of the tunnel segment as described in any one of claims 1 to 6 into the tunnel; S2. The drill bit passes through the pre-embedded pipe through the main body of the pipe segment and drills a hole in the soil outside the main body of the pipe segment to form a freezing hole in the soil for the freezing pipe to pass through. S3. Pass the freezing pipe through the pre-embedded pipe and insert it into the freezing hole to carry out the freezing method construction and form a frozen wall. S4. Under the protection of the frozen wall, the connecting channel is excavated.

8. The construction method as described in claim 7, characterized in that, The pre-embedded pipe is detachably fitted with a plug at one end near the inner side of the pipe segment body. After step S1 and before step S2, the plug is removed. After step S3, the exposed part of the freezing pipe is cut off and the pre-embedded pipe is filled and sealed. Then the plug is reinstalled to seal the pre-embedded pipe.

9. The construction method as described in claim 8, characterized in that, A segment sealing plate is provided. After the end cap is reinstalled, the segment sealing plate is used to seal the inner arc surface of the segment body corresponding to the pre-embedded pipe and fill the gap between the segment sealing plate and the end cap.

10. The construction method as described in claim 7, characterized in that: a partition plate and a filler are provided; before performing step S1, the partition plate is installed in the pre-embedded pipe; a filling space is formed between the end of the buried pipe near the outer side of the pipe segment body and the partition plate; and the filler is filled in the filling space; during step S2, the partition plate is broken through by a drill bit and the filler is passed through.

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