Construction method for deviation rectification of shield tunneling machine

Abstract

The invention discloses a construction method for deviation rectification of a shield tunneling machine, and particularly relates to a construction method for deviation rectification of the shield tunneling machine by adding a 7-shaped skirt hemline, optimizing configuration of a shield cutter and symmetrically increasing propulsive force of an upper main oil cylinder. According to the method, after a 7-shaped skirt hem is installed in a certain range of the bottom position of the front portion of a shield body, an original edge hob of a cutterhead is replaced with a tearing cutter, shell cutters are evenly welded in the annular direction, and then an auxiliary oil cylinder is additionally arranged at an upper thrust oil cylinder, so that the descending space of the shield tunneling machine is enlarged, and the head-lowering advancing trend of the shield tunneling machine is increased; therefore, the purpose of fast deviation rectification of the shield tunneling machine is achieved. The construction method is rapid in deviation correction, remarkable in effect and easy to practice and operate, and has popularization significance.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to a shield machine deviation correction construction method. Background Art

[0002] With the rapid development of urban rail transit, subways have gradually become an important means of transportation for people. As an important method for subway section construction, the shield method has a large number of shield attitude drift problems due to sudden changes in the strata or soft upper and hard lower layers. To solve the problem of shield attitude drift, especially for the situation where the attitude drift trend cannot be controlled. In addition, when the shield machine attitude is corrected, since the shield attitude cannot be restored in time, it may cause excessive vertical deviation of the pipe segment, and even make it impossible to solve it by adjusting the slope of the entire line, thus causing major quality accidents and huge social impact. How to quickly and safely correct the shield machine and ensure the line shape and quality of the pipe segment has become a new problem. Summary of the invention

[0003] In order to overcome the technical problems in the prior art, the present invention provides a construction method for correcting the deviation of a shield machine, which achieves rapid deviation correction of the shield machine by setting a "7"-shaped skirt at the lower part of the shield body, replacing the original edge roller of the cutter disc with a tearing knife, evenly welding shell knives in a circumferential direction, adding an auxiliary oil cylinder at the upper propulsion cylinder to increase the shield machine's descending space, and increasing the shield machine's "head-down" forward trend, thereby solving the above-mentioned technical problems.

[0004] A shield machine deviation correction construction method, characterized in that the construction method comprises the following construction steps:

[0005] S1: Install a "7"-shaped skirt in a certain range at the bottom of the front of the shield to enhance the scraping ability of the bottom of the shield, prevent the fine debris cut by the cutter disc from gradually accumulating at the bottom of the shield, and increase the space for the shield to descend;

[0006] S2: Replace the original edge roller of the cutter head with a tearing cutter to increase the excavation diameter of the shield machine, ensure the expansion effect, and further increase the space for the shield body to descend;

[0007] S3: Shell cutters are welded evenly in the circumferential direction on the cutter disc to scrape off the cutter slag in time and recycle it to the slag outlet at the bottom of the screw machine to prevent the slag from accumulating at the bottom of the shield and reduce the space for the shield to descend;

[0008] S4: Adding auxiliary cylinders symmetrically at the upper propulsion cylinder can increase the upper propulsion force of the shield machine and enable the shield machine to maintain a "head-down" forward trend.

[0009] In the above-mentioned construction method for correcting the deviation of a shield machine, in the step S1, a "7"-shaped skirt is installed within a certain range at the bottom of the front part of the shield body. The "7"-shaped skirt is made of small "7"-shaped steel plates with a thickness of 20 mm, processed and welded, and installed within a 120° range at the bottom of the front part of the shield body. It is assembled from 46 small "7"-shaped steel plates in total. When the "7"-shaped skirt is installed, it is ensured that the excavation diameter of the "7"-shaped skirt is less than the shield excavation diameter by 10 mm, which can not only ensure that the debris cut by the cutter head is blocked and gradually accumulated to the lower part of the shield body, causing the shield body to be unable to descend, but also prevent the "7"-shaped skirt from being damaged by friction with the bottom rock and soil during excavation and unable to play a role. At the same time, it can enhance the scraping ability of the bottom of the shield body. As the shield body moves forward, the fine debris cut by the cutter head at the bottom of the shield body can be scraped off, thereby increasing the shield body's descending space.

[0010] In the above-mentioned construction method for correcting the deviation of a shield machine, in step S2, the 18-inch roller cutter originally configured on the cutter head, whose excavation diameter is Φ8830, is replaced with a tearing cutter with a larger excavation diameter, and the excavation diameter is increased to Φ8916.6, which is increased by 43.3mm on one side. This can not only increase the excavation range of the shield machine and the space for the shield body to descend, but also prevent the occurrence of over-excavation due to an excessively large excavation range, thereby ensuring the safety of shield excavation.

[0011] In the above-mentioned construction method for correcting the deviation of a shield machine, in the step S3, 6 shell cutters are evenly welded in a circumferential direction toward the face of the tunnel by the cutter disc. On the premise of expanding the excavation by the tearing knife, the debris cut by the cutter disc can be promptly scraped off and recovered to the slag outlet at the bottom of the screw machine to prevent the accumulation of shield debris at the bottom of the shield body, and the space for the shield body to descend can be further increased. As the shield continues to excavate, the shield body can descend after reaching the expanded excavation area, thereby achieving the purpose of correction.

[0012] In the above-mentioned construction method for correcting the deviation of a shield machine, in the step S4, two 200T auxiliary cylinders are symmetrically added at the position of the upper propulsion cylinder of the shield machine, and are fixed by welding an L-shaped steel plate to the shield body. When the shield is advanced, the thrust of the auxiliary cylinders is increased synchronously to make the upper thrust of the shield machine greater than the lower thrust, thereby increasing the downward component of force. As the shield continues to advance, the shield body will gradually maintain a "lower head" trend. In addition, under the combined force of the "7"-shaped skirt, the tearing knife and the shell knife, the shield body can descend after reaching the expansion area, thereby ultimately achieving the purpose of deviation correction.

[0013] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0014] 1. The invention provides a construction method for correcting the deviation of a shield machine, which ensures that the excavation diameter of the "7"-shaped skirt is less than 10 mm of the shield excavation diameter, which can not only ensure that the debris cut by the cutter head is blocked and gradually accumulated to the lower part of the shield body, causing the shield body to be unable to descend, but also prevent the "7"-shaped skirt from being damaged by friction with the bottom rock and soil during excavation and unable to play a role, and at the same time enhance the scraping ability of the bottom of the shield body. As the shield body moves forward, the fine debris cut by the cutter head at the bottom of the shield body can be scraped off, thereby increasing the shield body descending space;

[0015] 2. The invention provides a shield machine deviation correction construction method, which replaces the original 18-inch roller cutter configured on the cutter head with a tearing cutter with a larger excavation diameter, which can not only increase the shield excavation range and the space for the shield body to descend, but also prevent the occurrence of over-excavation caused by an excessively large excavation range, thereby ensuring the safety of shield excavation;

[0016] 3. The invention provides a construction method for correcting the deviation of a shield machine. In the direction of the cutter head toward the tunnel face, 6 shell cutters are evenly welded in a circumferential direction. Under the premise of the tearing knife expanding the excavation, the debris cut by the cutter head can be promptly scraped off and recovered to the slag outlet at the bottom of the screw machine to prevent the accumulation of shield debris at the bottom of the shield body, and the space for the shield body to descend can be further increased. As the shield continues to excavate, the shield body can descend after reaching the expanded excavation area, thereby achieving the purpose of deviation correction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 A longitudinal section view of the "7"-shaped skirt described in a shield machine deviation correction construction method of the present invention;

[0019] Figure 2 It is a cross-sectional view of the "7"-shaped skirt described in a shield machine deviation correction construction method of the present invention;

[0020] Figure 3 A schematic diagram of the installation of the tearing knife in a shield machine deviation correction construction method of the present invention;

[0021] Figure 4 A schematic diagram of the installation of a shell cutter in a shield machine deviation correction construction method of the present invention;

[0022] Figure 5 The present invention is a schematic diagram of the installation of the auxiliary oil cylinder in a construction method for correcting the deviation of a shield machine.

[0023] In the figure: 1-“7” shaped skirt, 2-tearing knife, 3-shell knife, 4-auxiliary cylinder, 5-L-shaped steel plate. DETAILED DESCRIPTION

[0024] The invention discloses a construction method for correcting the deviation of a shield machine. The method comprises the following steps: arranging a "7"-shaped skirt 1 at the lower part of a shield body, replacing the original edge roller of a cutter disc with a tearing knife 2, then uniformly welding shell knives 3 in a circumferential direction, and adding an auxiliary oil cylinder 4 at an upper propulsion oil cylinder to increase the descending space of the shield machine and increase the "head-down" forward trend of the shield machine, so as to realize rapid deviation correction of the shield machine.

[0025] like Figure 1 and Figure 2 As shown, the longitudinal section view and the cross-sectional view of the "7"-shaped skirt 1 described in the construction method for correcting the deviation of a shield machine of the present invention are shown. The "7"-shaped skirt 1 is made of 20 mm thick small "7"-shaped steel plates processed, welded and spliced ​​together, and is installed within a 120° range at the bottom of the front part of the shield body. It is assembled from 46 small "7"-shaped steel plates in total.

[0026] When the "7"-shaped skirt 1 is installed, ensure that the excavation diameter of the "7"-shaped skirt 1 is 1 cm smaller than the shield excavation diameter. This can ensure that the debris cut by the cutter head is blocked and gradually accumulated to the lower part of the shield body, causing the shield body to be unable to descend, and can also prevent the "7"-shaped skirt 1 from being damaged by friction with the bottom rock and soil during excavation and unable to play a role. In addition, the scraping ability of the bottom of the shield body can be enhanced. As the shield body moves forward, the fine debris cut by the cutter head at the bottom of the shield body can be scraped off, thereby increasing the shield body's descending space.

[0027] like Figure 3 As shown, it is a schematic diagram of the installation of the tearing knife 2 described in the construction method of the shield machine correction of the present invention. The 18-inch roller cutter with an excavation diameter of Φ8830 originally configured on the cutter head is replaced with a tearing knife 2 with a larger excavation diameter, and the excavation diameter is increased to Φ8916.6, that is, a single-side increase of 43.3mm. This can not only increase the excavation range of the shield and increase the space for the shield body to descend, but also prevent the occurrence of over-excavation caused by an excessively large excavation range, thereby ensuring the safety of shield excavation.

[0028] like Figure 4 As shown, it is a schematic diagram of the installation of the shell cutter 3 described in a construction method for correcting the deviation of a shield machine of the present invention. Six shell cutters 3 are evenly welded in a circumferential direction on the direction of the cutter disc toward the face of the tunnel. On the premise of the expansion of the tearing knife 2, the debris cut by the cutter disc can be promptly scraped off and recovered to the slag outlet at the bottom of the screw machine to prevent the accumulation of shield debris at the bottom of the shield body, and the space for the shield body to descend can be further increased. As the shield continues to excavate, the shield body can descend after reaching the expansion area, thereby achieving the purpose of correction.

[0029] like Figure 5As shown, it is a schematic diagram of the installation of the auxiliary cylinder 4 described in a construction method for correcting the deviation of a shield machine of the present invention. Two 200T auxiliary cylinders 4 are symmetrically added at the position of the upper propulsion cylinder of the shield machine, and the L-shaped steel plate 5 is welded and fixed to the shield body. When the shield machine is advanced, the thrust of the auxiliary cylinder 4 is increased synchronously, so that the upper thrust of the shield machine is greater than the lower thrust, thereby increasing the downward component of force. As the shield machine continues to advance, the shield body will gradually maintain a "lower head" trend. In addition, under the combined force of the "7"-shaped skirt 1, the tearing knife 2 and the shell knife 3, the shield body can drop after reaching the expansion area, thereby finally achieving the purpose of deviation correction.

Claims

1. A shield machine deviation correction construction method, characterized in that: The construction method realizes fast deviation correction of the shield machine by arranging a "7"-shaped skirt (1) at the lower part of the shield body, replacing the original edge roller of the cutter head with a tearing knife (2), then uniformly welding shell knives (3) in the circumferential direction, and adding an auxiliary oil cylinder (4) at the upper propulsion oil cylinder to increase the descending space of the shield machine and increase the "head-down" forward trend of the shield machine. The method comprises the following steps: S1: A "7"-shaped skirt (1) is installed within a certain range at the bottom of the front part of the shield body to enhance the scraping ability of the bottom of the shield body, prevent the fine debris cut by the cutter disc from gradually accumulating at the bottom of the shield body, and increase the space for the shield body to descend; S2: Replace the original edge roller of the cutter head with a tearing knife (2) to increase the excavation diameter of the shield machine, ensure the expansion effect, and further increase the space for the shield body to descend; S3: Shell cutters (3) are evenly welded on the cutter disc in an annular direction, so that the slag removed by cutting can be scraped off in time and recycled to the slag outlet at the bottom of the screw machine, so as to prevent the slag from accumulating at the bottom of the shield and reduce the space for the shield to descend; S4: Auxiliary cylinders (4) are added symmetrically at the upper propulsion cylinders to increase the upper propulsion force of the shield machine and enable the shield machine to maintain a "head-down" forward movement.

2. A shield machine deviation correction construction method according to claim 1, characterized in that: In the step S1, a "7"-shaped skirt (1) is installed at the bottom of the front part of the shield body. The "7"-shaped skirt (1) is made of small "7"-shaped steel plates with a thickness of 20 mm, which are processed, welded and spliced. It is installed within a range of 120° at the bottom of the front part of the shield body and is assembled from 46 small "7"-shaped steel plates. When the "7"-shaped skirt (1) is installed, it is ensured that the excavation diameter of the "7"-shaped skirt (1) is less than the shield excavation diameter by 10 mm.

3. A shield machine deviation correction construction method according to claim 1, characterized in that: In step S2, the original edge cutter of the cutter disc is replaced with a tearing cutter (2), and the original 18-inch cutter of the cutter disc, whose excavation diameter is Φ8830, is replaced with a tearing cutter (2) with a larger excavation diameter, and the excavation diameter is increased to Φ8916.6 mm.

4. A shield machine deviation correction construction method according to claim 1, characterized in that: In the step S3, shell knives (3) are welded evenly in the circumferential direction. In the direction from the cutter head to the tunnel face, six shell knives (3) are welded evenly in the circumferential direction. Under the premise of the tearing knife (2) expanding the excavation, the slag cut by the cutter head can be scraped off in time and recovered to the slag outlet at the bottom of the screw machine.

5. A shield machine deviation correction construction method according to claim 1, characterized in that: In the step S4, auxiliary cylinders (4) are symmetrically added at the upper propulsion cylinder, and two 200T auxiliary cylinders (4) are symmetrically added at the position of the upper propulsion cylinder of the shield machine, and are fixed to the shield body by welding with an L-shaped steel plate (5).

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