Cavity type high efficiency frozen steel pipe piece

Abstract

A kind of cavity type high-efficiency frozen steel pipe piece, including steel pipe piece for first and last splicing to form whole ring pipe piece, the side of steel pipe piece close to earth body is back plate, the inner side of the back plate of steel pipe piece is provided with partition, closed cavity is formed between back plate and partition, rib plate is provided in cavity, and rib plate is separated to form frozen flow channel, and inlet and outlet are provided on frozen flow channel.The utility model discloses frozen flow channel of closed cavity, greatly increases the heat exchange area of frozen liquid and steel pipe piece back plate, when construction, frozen liquid in frozen flow channel carries out high-efficiency, uniform heat exchange with earth body by large area back plate, to form frozen wall quickly, significantly shorten freezing time, guarantee construction progress.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine (TBM) construction technology, and in particular to a cavity-type high-efficiency cryogenic steel tube segment. Background Technology

[0002] Freezing, as a mature ground reinforcement technology, has been widely used in underground engineering projects such as mines and subways. Its basic principle is to circulate and inject a low-temperature medium (such as calcium chloride) to freeze the moisture in the surrounding strata, forming a freezing curtain that effectively isolates water and strengthens the strata. In recent years, with the continuous development of freezing technology, its application in tunnel boring machine (TBM) construction has gradually increased, especially demonstrating unique advantages in high-risk operations such as tail shield brush replacement.

[0003] In tunnel boring machine (TBM) construction, the freezing method typically involves laying freezing pipes on the tunnel segments to freeze the ground. However, this method has the drawback of a limited freezing contact area, resulting in low freezing efficiency, slow formation of the frozen wall, and consequently, project delays. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a cavity-type high-efficiency freezing steel tube sheet. This structure can effectively increase the freezing contact area, improve freezing efficiency, and shorten the construction period.

[0005] To achieve the above objectives, the present invention employs the following technical solution: a cavity-type high-efficiency freezing steel tube segment, comprising steel tube segments for end-to-end splicing to form a complete ring segment, wherein the side of the steel tube segment closest to the soil is a back plate, characterized in that: a partition is provided on the inner side of the back plate of the steel tube segment, and a closed cavity is formed between the back plate and the partition; a rib is provided inside the cavity, and the rib divides the cavity to form a freezing flow channel; the freezing flow channel is provided with an inlet and an outlet.

[0006] As a further improvement of this utility model, several of the steel pipe segments are spliced ​​together to form a complete ring segment. The liquid inlet of the first steel pipe segment and the liquid outlet of the last steel pipe segment are connected to the refrigeration unit, and the liquid outlets and liquid inlets between the remaining two adjacent steel pipe segments are connected.

[0007] As a further improvement of this utility model, the rib is provided with two ribs, which are spaced apart along the width direction of the steel tube sheet, and the length direction of each rib is along the length direction of the steel tube sheet. The two ribs are staggered and have gaps to form an S-shaped freezing channel.

[0008] As a further improvement of this utility model, the rib is a corrugated plate.

[0009] As a further improvement of this utility model, the liquid inlet and liquid outlet are respectively arranged at the beginning and end of the refrigeration channel; at least two liquid inlets are arranged side by side; at least two liquid outlets are arranged side by side.

[0010] As a further improvement of this utility model, it also includes a grouting hole, which extends from the inside of the partition plate to the outside of the back plate.

[0011] As a further improvement of this utility model, at least four grouting holes are provided, and the at least four grouting holes are spaced apart along the length of the steel pipe segment.

[0012] As a further improvement of this utility model, it also includes a temperature measuring hole, which extends from the inside of the partition to the outside of the back plate.

[0013] As a further improvement of this utility model, the temperature measuring hole is set on the radial centerline of the steel tube.

[0014] As a further improvement of this utility model, the partition is arranged parallel to the back plate; the ribs are perpendicular to the back plate and the partition, respectively.

[0015] The beneficial effects of this invention are as follows: By improving the traditional "line contact" type freezing pipe to a "surface contact" type closed-cavity freezing channel, this invention greatly increases the heat exchange area between the refrigerant and the back plate of the steel pipe segment. During construction, the refrigerant in the freezing channel exchanges heat efficiently and evenly with the soil through the large-area back plate, thereby quickly forming a frozen wall, significantly shortening the freezing time, and ensuring the construction progress. Furthermore, the ribs installed inside the cavity not only guide the refrigerant to form the freezing channel but also serve as important reinforcing ribs. These ribs greatly enhance the overall structural rigidity and load-bearing capacity of the steel pipe segment, effectively resisting external soil pressure and ensuring structural safety during the freezing process and construction. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the steel pipe segment described in this utility model;

[0017] Figure 2 This is a side sectional view of the steel pipe segment described in this utility model;

[0018] Figure 3 This is a schematic diagram of the top surface of the freezing channel described in this utility model;

[0019] Figure 4 This is a side view of the cryogenic flow channel described in this utility model;

[0020] Marking description: 1. Steel tube plate; 2. Back plate; 3. Partition plate; 4. Rib plate; 5. Freezing channel; 6. Liquid inlet; 7. Liquid outlet; 8. Grouting hole; 9. Temperature measuring hole. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0022] like Figure 1-4 As shown, a cavity-type high-efficiency cryogenic steel tube segment includes a steel tube segment 1 for splicing end to end to form a complete ring segment. The steel tube segment 1 has an arc-shaped structure and an arc-shaped back plate 2. After the complete ring segment is assembled, the back plate 2 is located on the side close to the soil. A partition 3 is provided inside the steel tube segment 1 and inside the back plate 2. The partition 3 is parallel to the back plate 2 and is connected to both ends of the steel tube segment 1 by welding or other means, so that the back plate 2 and the partition 3 form a closed arc-shaped flat cavity inside the steel tube segment 1.

[0023] Two ribs 4 are arranged within the cavity, spaced apart along the width of the steel tube segment 1, and each rib 4 extends along the length of the steel tube segment 1. The upper and lower sides of the ribs 4 are welded and fixed to the back plate 2 and the partition plate 3, respectively, making the ribs 4 perpendicular to the back plate 2 and the partition plate 3. Crucially, the ends of the two ribs 4 are not aligned, but staggered, with gaps at the staggered points. This arrangement divides the cavity into a continuous, meandering S-shaped freezing channel 5. The flow of the refrigerant in the freezing channel 5 significantly extends the heat exchange path and promotes uniform cold distribution. In a more preferred embodiment, the ribs 4 are designed with a corrugated structure, further agitating the refrigerant at the microscopic level, ensuring uniform flow and enhancing the heat exchange effect. Furthermore, the ribs 4 also act as reinforcing ribs, greatly enhancing the overall structural rigidity and load-bearing capacity of the steel tube segment 1, effectively resisting external earth pressure, and ensuring structural safety during the freezing process and construction.

[0024] The first and last ends of the refrigeration channel 5 are respectively provided with liquid inlets 6 and liquid outlets 7. To increase the flow rate and reduce the flow resistance, the liquid inlets 6 and liquid outlets 7 are preferably arranged side by side. In actual construction, the entire ring segment is composed of 6+1 steel pipe segments 1 spliced ​​together, one of which is a capping block, for a total of 7 steel pipe segments 1. The 7 steel pipe segments 1 are spliced ​​end to end to form a complete ring. The liquid inlet 6 of the first steel pipe segment 1 at the beginning of the ring segment is connected to the external refrigeration unit through a pipeline, and the liquid outlet 7 of the last steel pipe segment 1 at the end of the ring segment is also connected to the refrigeration unit through a pipeline, forming a loop. The liquid outlet 7 of the previous steel pipe segment 1 and the liquid inlet 6 of the next steel pipe segment 1 are connected in series through pipelines. In this way, the cryogenic liquid (such as calcium chloride solution) pumped out by the refrigeration unit will flow through the freezing channels 5 of all steel pipe segments 1 in the entire ring segment, freezing the soil around the entire ring segment over a large area.

[0025] To meet other functional requirements of tunnel construction, the steel pipe segment 1 is also equipped with grouting holes 8 and temperature measuring holes 9, integrating grouting and temperature monitoring functions. The grouting holes 8 extend from the inside of the partition plate 3 to the outside of the back plate 2. Preferably, there are four grouting holes 8, evenly spaced along the length of the steel pipe segment 1. These grouting holes 8 allow for thawing and settlement grouting after soil thawing. The temperature measuring holes 9 extend from the inside of the partition plate 3 to the outside of the back plate 2. To accurately measure the temperature in the central area of ​​the frozen wall, the temperature measuring holes 9 are preferably located on the radial centerline of the steel pipe segment 1. During construction, a temperature sensor can be inserted into the temperature measuring hole 9 to monitor temperature changes in real time during the soil freezing process.

[0026] The working principle of the above-mentioned steel pipe segment 1 is as follows:

[0027] In construction sections requiring soil reinforcement, such as those involving the replacement of the tail brush, the aforementioned steel pipe segments 1 are assembled into a ring. The chiller is then activated, and cryogenic liquid enters from the inlet 6 of the first steel pipe segment 1, flows through the chilled flow channels 5 connected in series with multiple steel pipe segments 1, and returns to the chiller from the outlet 7 of the last steel pipe segment 1. The coldness of the cryogenic liquid is efficiently and rapidly transferred to the surrounding soil through the large-area backplate 2, which is in direct contact with the soil, causing the moisture in the soil to freeze. This quickly forms a sealed and robust frozen wall around the tunnel, allowing the tail brush replacement operation to proceed under the protection of this frozen wall. This method is characterized by convenient operation, high efficiency, and good safety. During this process, the freezing effect can be monitored through the temperature measuring hole 9. After construction is completed, freezing is stopped, and after the soil thaws, grouting can be performed through the grouting hole 8.

[0028] In this embodiment, the steel tube segment 1, through an innovative built-in cavity flow channel design, perfectly combines the freezing function with the tube segment structure, which not only solves the problem of low freezing efficiency of traditional external freezing tubes, but also significantly enhances the structural performance of the tube segment, achieving high efficiency, safety and high integration.

[0029] The above-described embodiments are merely illustrative of this utility model. Any equivalent embodiments made by those skilled in the art without departing from the technical features disclosed in this utility model, and without departing from the technical features of this utility model, shall still fall within the scope of the technical features of this utility model.

Claims

1. A cavity-type high-efficiency freezing steel pipe segment, comprising steel pipe segments for end-to-end splicing to form a complete ring segment, wherein the side of the steel pipe segment in close contact with the soil is a back plate, characterized in that: A partition is provided on the inner side of the back plate of the steel tube segment, and a closed cavity is formed between the back plate and the partition; a rib is provided in the cavity, and the rib divides the cavity to form a freezing channel; an inlet and an outlet are provided on the freezing channel.

2. The cavity-type high-efficiency cryogenic steel tube sheet according to claim 1, characterized in that: Several steel pipe segments are spliced ​​together to form a complete ring segment. The liquid inlet of the first steel pipe segment and the liquid outlet of the last steel pipe segment are connected to the refrigeration unit. The liquid outlets and liquid inlets between any two adjacent steel pipe segments are connected.

3. The cavity-type high-efficiency cryogenic steel tube sheet according to claim 1, characterized in that: The ribs are provided in two rows, which are spaced apart along the width of the steel tube and the length of each rib is also arranged along the length of the steel tube. The two ribs are staggered and have gaps to form an S-shaped refrigeration channel.

4. The cavity-type high-efficiency cryogenic steel tube sheet according to claim 3, characterized in that: The rib is a corrugated plate.

5. The cavity-type high-efficiency cryogenic steel tube sheet according to claim 1, characterized in that: The liquid inlet and liquid outlet are respectively located at the beginning and end of the refrigeration channel; at least two liquid inlets are arranged side by side; at least two liquid outlets are arranged side by side.

6. The cavity-type high-efficiency cryogenic steel tube sheet according to claim 1, characterized in that: It also includes grouting holes that extend from the inside of the partition to the outside of the back plate.

7. A cavity-type high-efficiency cryogenic steel tube sheet according to claim 6, characterized in that: The grouting holes are provided in at least four locations, and the at least four grouting holes are spaced apart along the length of the steel pipe segment.

8. The cavity-type high-efficiency cryogenic steel tube sheet according to claim 1, characterized in that: It also includes a temperature measuring hole that extends from the inside of the partition to the outside of the back plate.

9. A cavity-type high-efficiency cryogenic steel tube sheet according to claim 8, characterized in that: The temperature measuring hole is located on the radial centerline of the steel tube segment.

10. A cavity-type high-efficiency cryogenic steel tube sheet according to claim 1, characterized in that: The partition is parallel to the back plate; the ribs are perpendicular to the back plate and the partition, respectively.

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