Quasi-rectangular shield soil body segmenting and excavating device

Abstract

The invention provides a quasi-rectangular shield soil body segmenting and excavating device which comprises a quasi-rectangular outer edge wall, a quasi-rectangular shield body, a quasi-rectangular shield body cutting device, a quasi-rectangular shield body cutting device, a quasi-rectangular shield body cutting device, a quasi-rectangular shield body cutting device, a quasi-rectangular shield body cutting device and a quasi-rectangular shield body cutting device. The cutterhead is arranged in the quasi-rectangular outer edge wall, and a cutting blind area exists between the cutterhead and the inner side wall of the shield tunneling machine shell; the cutter head is connected with the shield body; the soil body cutting device is arranged in the cutting blind area, and a sharp corner is arranged on the side, close to the cutter head, of the soil body cutting device so that the soil body can be broken when the shield body is propelled; one side, far away from the cutter head, of the soil body cutting device is connected with the rectangular outer edge wall; the soil body cutting device is arranged in the axial direction of the rectangular outer edge wall. According to the soil body cutting device, the cutting blind area of a quasi-rectangular shield double-circular cutter head is just made up, the soil body is broken through the sharp corner below the soil body cutting device in the tunneling process, and the cross section soil body cutting rate of a quasi-rectangular shield tunnel can reach 99% or above.

Description

Technical Field

[0001] The invention relates to a quasi-rectangular shield soil body segmentation and excavation device. Background Art

[0002] The utilization rate of urban underground space is increasing year by year, and the density of underground structures is increasing year by year. The utilization rate of ordinary circular tunnels for underground space can no longer meet the goal of intensive development of underground space. Therefore, the use frequency of rectangular shield tunnels with high cross-section utilization is increasing year by year in large cities. As the cutting section of existing rectangular shield machines is not symmetrical in center rotation, existing rectangular shield machines usually have combined cutter heads to cut soil.

[0003] There are two types of existing rectangular shield cutterhead arrangements:

[0004] (1) Two circular cutterheads are simply arranged symmetrically on the left and right to cut the soil. This cutterhead arrangement has a very low soil cutting rate. The soil in the blind area between the upper and lower parts of the shield cannot be cut. During the advancement process, the soil in this area is squeezed and compacted, which can easily increase the cutterhead torque, increase the shield thrust, hinder the advancement, and even cause the cutterhead to get stuck.

[0005] (2) Two circular cutterheads are arranged symmetrically on the left and right, and fan-shaped eccentric cutterheads are set at the positions where the two circular cutterheads cut the blind spots. Although this method can solve the problem of low cross-sectional cutting rate, the torque fluctuation of the eccentric cutterhead is large during the advancement process, and the cutterhead is prone to getting stuck, especially in sandy formations. In addition, the cost of double eccentric cutterheads + double circular cutterheads is high, which is not economical and applicable. Summary of the invention

[0006] The purpose of the present invention is to provide a quasi-rectangular shield soil segmentation and excavation device.

[0007] In order to solve the above problems, the present invention provides a quasi-rectangular shield soil segmentation and excavation device, comprising:

[0008] The quasi-rectangular outer edge wall is arranged at the front part of the quasi-rectangular shield machine shell, and a shield body is arranged in the quasi-rectangular shield machine shell;

[0009] A cutterhead is arranged in the quasi-rectangular outer edge wall, and there is a cutting blind area between the cutterhead and the inner side wall of the shield machine housing; the cutterhead is connected to the shield body;

[0010] A soil dividing device is arranged in the cutting blind area, and a sharp corner is arranged on the side of the soil dividing device close to the cutter disc to break the soil when the shield body is advanced; the side of the soil dividing device away from the cutter disc is connected to the rectangular outer edge wall; the soil dividing device is arranged along the axial direction of the rectangular outer edge wall.

[0011] Furthermore, in the above-mentioned quasi-rectangular shield soil segmentation and excavation device, the cutter disc is a double circular cutter disc structure.

[0012] Furthermore, in the above-mentioned quasi-rectangular shield soil dividing and excavating device, the soil dividing device is respectively arranged in the cutting blind areas at the upper and lower parts of the cutter disc.

[0013] Furthermore, in the above-mentioned rectangular shield soil division and excavation device, the rectangular outer edge wall is formed by connecting the front middle shield upper block, the front middle shield right block, the front middle shield lower block and the front middle shield left block in sequence, and the soil division device is respectively arranged on the front middle shield upper block and the front middle shield lower block.

[0014] Furthermore, in the above-mentioned quasi-rectangular shield soil dividing and excavating device, the material of the soil dividing device is tungsten-cobalt cemented carbide.

[0015] Furthermore, in the above-mentioned quasi-rectangular shield soil dividing and excavating device, the cross-sectional shape of the head of the soil dividing device is a seagull-shaped block.

[0016] Furthermore, in the above-mentioned quasi-rectangular shield soil dividing and excavating device, along the axial direction of the rectangular outer edge wall, the cross-sectional area of ​​the soil dividing device gradually decreases from the head to the tail.

[0017] Furthermore, in the above-mentioned quasi-rectangular shield soil dividing and excavating device, the angle between the cross-section of the tail of the soil dividing device and the rectangular outer edge wall is a right triangle perpendicular to the right triangle, so as to form a hollow soil bin within the angle of the right triangle.

[0018] Furthermore, in the above-mentioned quasi-rectangular shield soil segmentation and excavation device, the area of ​​the seagull-shaped block is smaller than the area of ​​the blind spot, so that a gap is left between the seagull-shaped block and the rotation radius of the cutter disc.

[0019] Furthermore, in the above-mentioned rectangular shield soil segmentation and excavation device, the gap between the seagull-shaped block and the rotation radius of the cutter disc is 2 cm.

[0020] Compared with the prior art, the present invention includes: a quasi-rectangular outer edge wall, which is arranged at the front of the quasi-rectangular shield machine housing, and a shield body is arranged in the quasi-rectangular shield machine housing; a cutterhead arranged in the quasi-rectangular outer edge wall, and there is a cutting blind area between the cutterhead and the inner wall of the shield machine housing; the cutterhead is connected to the shield body; a soil dividing device is arranged in the cutting blind area, and a sharp corner is arranged on the side of the soil dividing device close to the cutterhead to break the soil when the shield body is pushed forward; the side of the soil dividing device away from the cutterhead is connected to the rectangular outer edge wall; the soil dividing device is arranged along the axial direction of the rectangular outer edge wall. The soil dividing device of the present invention just makes up for the cutting blind area of ​​the double circular cutterhead of the quasi-rectangular shield, and the soil is broken by using the sharp corner below the soil dividing device during the excavation process, so that the cross-sectional soil cutting rate of the quasi-rectangular shield tunnel can reach more than 99%.

[0021] In addition, the two seagull-shaped tungsten-cobalt cemented carbide pieces in the device are shaped like the blind spots of the rectangular shield double-circular cutter disc. After being welded to the rectangular outer edge, a 2cm gap exists between the seagull lower arm and the rotation radius of the double-circular cutter disc. This can not only use the sharp corners under the seagull body to break the soil and squeeze the soil into the cutter disc for cutting during excavation, but also prevent the seagull-shaped device from colliding with the double-circular cutter disc due to slight deformation of the shell during excavation without a gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front cross-sectional schematic diagram of a quasi-rectangular shield soil dividing and excavating device with a seagull block soil dividing device according to an embodiment of the present invention;

[0023] Figure 2 is a three-dimensional stereogram of a seagull-shaped soil dividing device according to an embodiment of the present invention;

[0024] Figure 3 It is a cross-sectional view of a quasi-rectangular shield soil dividing and excavating device with a seagull-shaped soil dividing device according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the installation of a seagull-shaped soil dividing device according to an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the assembly of a quasi-rectangular shield body after installing a seagull block soil dividing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5 As shown, the present invention provides a quasi-rectangular shield soil segmentation and excavation device, comprising:

[0029] A quasi-rectangular outer edge wall 3 is arranged at the front part of the quasi-rectangular shield machine shell, and a shield body is arranged in the quasi-rectangular shield machine shell;

[0030] A cutter disc is arranged in the rectangular outer edge wall 3, and there is a cutting blind area between the cutter disc and the inner wall of the shield machine housing; the cutter disc is connected to the shield body; specifically, the cutting range 6, 7 of the cutter disc, such as Figure 1 As shown, the area outside the cutting range 6 of the cutter head in the shield machine housing 3 is the cutting blind area; here, the protruding part of the front part of the shield machine housing forms a rectangular outer edge wall 3;

[0031] A soil dividing device is arranged in the cutting blind area, and a sharp corner is arranged on the side of the soil dividing device close to the cutter disc to break the soil when the shield body is advanced; the side of the soil dividing device away from the cutter disc is connected to the rectangular outer edge wall 3; the soil dividing device is arranged along the axial direction of the rectangular outer edge wall.

[0032] Here, in view of the low cross-sectional soil cutting rate of the existing cutterhead structure of the quasi-rectangular shield tunnel or the phenomenon that the eccentric combined cutterhead is prone to getting stuck and falling off, the present invention cuts the blind area soil by welding the soil dividing device to the rectangular outer edge wall 3 of the shield shell at the cutting blind area positions above and below the cutterhead, so that the cross-sectional soil cutting rate of the quasi-rectangular shield tunnel can reach more than 99%, and the cost is low, the structure is simple, and it is easy to install, and it can be reused on other shield machines after being cut off.

[0033] In some embodiments of the quasi-rectangular shield soil segmentation and excavation device of the present invention, the cutter disc is a double circular cutter disc structure, such as Figure 1 As shown, the double circular cutter disc structure includes a right circular cutter disc 4 and a left circular cutter disc 5.

[0034] Here, in view of the low cross-sectional soil cutting rate of the existing double circular cutter disc structure of the quasi-rectangular shield tunnel or the problem that the eccentric combined cutter disc is prone to getting stuck and falling off, the seagull block soil dividing and excavating device of the present invention cuts the blind area soil by welding seagull-shaped hard alloys to the shield shell at the upper and lower cutting blind areas of the double circular cutter disc, so that the cross-sectional soil cutting rate of the quasi-rectangular shield tunnel can reach more than 99%. In addition, the device is inexpensive, has a simple structure, is easy to install, and can be reused on other shield machines after being cut off.

[0035] In some embodiments of the quasi-rectangular shield soil dividing and excavating device of the present invention, the soil dividing device is respectively arranged in the cutting blind areas at the upper part and the lower part of the cutter disc.

[0036] Here, the soil dividing device can be arranged in the cutting blind areas at the upper and lower parts of the cutter disc, and welded to the upper and lower parts of the inner side wall of the quasi-rectangular outer edge wall 3 .

[0037] In some embodiments of the rectangular shield soil segmentation and excavation device of the present invention, Figure 4 and 5 As shown, the rectangular outer edge wall 3 is formed by connecting the front center shield upper block 12, the front center shield right block 14, the front center shield lower block 13 and the front center shield left block 15 in sequence, and the soil dividing device is respectively arranged on the front center shield upper block 12 and the front center shield lower block 13.

[0038] Here, the upper and lower pieces of seagull-shaped tungsten-cobalt cemented carbide 1 and 2 are respectively welded to the upper and lower blocks of the front middle shield of the quasi-rectangular outer edge wall 3. The device is connected to the quasi-rectangular outer edge wall 3 by welding, and the connection is firm, the integrity is good, and the rigidity is large.

[0039] In some embodiments of the quasi-rectangular shield soil dividing and excavating device of the present invention, the cross-sectional shape of the head of the soil dividing device is a seagull-shaped block, such as Figure 1 As shown, a seagull-shaped block 1 connected to the upper part of the quasi-rectangular outer edge wall 3 and a seagull-shaped block 2 connected to the lower part of the quasi-rectangular outer edge wall 3 can be respectively provided. Figure 2 As shown, the seagull-shaped block includes: a soil facing surface 8, an upper surface 9 on the top of the soil facing surface 8, and a lower surface 10 located on both sides of the soil facing surface 8 and the upper surface 9.

[0040] Here, the seagull-shaped soil dividing devices 1 and 2 can just make up for the blind area of ​​the double circular cutter disc cutting of the rectangular shield. During the excavation process, the sharp corners below the seagull body are used to break the soil, so that the cross-sectional soil cutting rate of the rectangular shield tunnel can reach more than 99%.

[0041] In some embodiments of the quasi-rectangular shield soil dividing and excavating device of the present invention, the material of the soil dividing device is tungsten-cobalt cemented carbide.

[0042] Here, the soil dividing device is made of tungsten-cobalt cemented carbide, which has high structural hardness, good toughness and is not easy to wear. The device is connected to the rectangular outer edge wall 3 as a whole by welding, and is not easy to deform or fall off during the excavation process.

[0043] In some embodiments of the quasi-rectangular shield soil dividing and excavating device of the present invention, the cross-sectional area of ​​the soil dividing device gradually decreases from the head to the tail along the axial direction of the rectangular outer edge wall, such as Figure 3 As shown, the angle between the cross section of the tail of the soil dividing device and the rectangular outer edge wall is a right triangle, so as to form a hollow soil bin within the angle of the right triangle.

[0044] Here, the axial direction of the rectangular outer edge wall is the propulsion direction of the shield machine. The front cross-section of the soil dividing device is a seagull shape with an area slightly smaller than the blind spot, and the cross-section of the soil dividing device gradually becomes smaller in the axial direction toward the tail. In particular, the lower sharp corner of the seagull-shaped block of the head cross-section of the soil dividing device is more convenient for breaking the soil, and the cross-sectional area of ​​the rear tail of the soil dividing device gradually decreases, which is convenient for forming a cavity soil bin to squeeze the broken soil into the cavity soil bin. The cross-section of the tail of the soil dividing device gradually becomes smaller as it approaches the shield body. Finally, the angle between the cross-section of the tail of the soil dividing device and the rectangular outer edge wall is a right triangle perpendicular to the right triangle, and a cavity soil bin is formed within the angle of the right triangle.

[0045] In some embodiments of the rectangular shield soil segmentation and excavation device of the present invention, Figure 1 As shown, the area of ​​the seagull-shaped block is smaller than the area of ​​the blind spot, so that a gap 11 is left between the seagull-shaped block and the rotation radius of the cutter disc.

[0046] Here, the shape of the seagull-shaped block matches the shape of the blind spot outside the rotation radius of the cutter disc, but the area of ​​the seagull-shaped block is smaller than the area of ​​the blind spot, so as to satisfy the requirement of setting a gap between the seagull lower arm and the rotation radius of the cutter disc, so as to prevent the seagull-shaped block from colliding with the double-circular cutter disc due to micro-deformation of the shell during excavation if no gap is set.

[0047] In some embodiments of the quasi-rectangular shield soil segmentation and excavation device of the present invention, the gap between the seagull-shaped block and the rotation radius of the cutter disc is 2 cm.

[0048] In summary, the soil dividing device of the present invention just makes up for the blind area of ​​the double circular cutter disc of the quasi-rectangular shield. During the excavation process, the soil is broken by the sharp corners below the soil dividing device, so that the cross-sectional soil cutting rate of the quasi-rectangular shield tunnel can reach more than 99%. The two seagull-shaped tungsten-cobalt hard alloys in the device are similar to the blind area of ​​the double circular cutter disc of the rectangular shield. After being welded to the outer edge of the quasi-rectangular shape, there is a 2cm gap between the lower arm of the seagull and the rotation radius of the double circular cutter disc. The sharp corners below the seagull body can be used to break the soil, and the soil can be squeezed into the cutter disc for cutting during the excavation process. It can also prevent the collision between the seagull body device and the double circular cutter disc caused by micro-deformation of the shell when excavating without a gap.

[0049] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0050] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A quasi-rectangular shield soil segmentation and excavation device, characterized in that: include: The quasi-rectangular outer edge wall is arranged at the front part of the quasi-rectangular shield machine shell, and a shield body is arranged in the quasi-rectangular shield machine shell; A cutterhead is arranged in the quasi-rectangular outer edge wall, and there is a cutting blind area between the cutterhead and the inner side wall of the shield machine housing; the cutterhead is connected to the shield body; A soil dividing device is arranged in the cutting blind area, and a sharp corner is arranged on the side of the soil dividing device close to the cutter disc to break the soil when the shield body is advanced; the side of the soil dividing device away from the cutter disc is connected to the rectangular outer edge wall; the soil dividing device is arranged along the axial direction of the rectangular outer edge wall.

2. The quasi-rectangular shield soil segmentation and excavation device according to claim 1, characterized in that: The cutter disc is a double circular cutter disc structure.

3. The rectangular shield soil segmentation and excavation device according to claim 1, characterized in that: The soil body dividing devices are respectively arranged at the cutting blind areas at the upper part and the lower part of the cutter disc.

4. The quasi-rectangular shield soil segmentation and excavation device according to claim 1, characterized in that: The rectangular outer edge wall is formed by sequentially connecting the front middle shield upper block, the front middle shield right block, the front middle shield lower block and the front middle shield left block, and the soil dividing device is respectively arranged on the front middle shield upper block and the front middle shield lower block.

5. The quasi-rectangular shield soil segmentation and excavation device according to claim 1, characterized in that: The soil dividing device is made of tungsten-cobalt hard alloy.

6. The quasi-rectangular shield soil segmentation and excavation device according to claim 1, characterized in that: The cross-sectional shape of the head of the soil dividing device is a seagull-shaped block.

7. The quasi-rectangular shield soil segmentation and excavation device according to claim 1, characterized in that: Along the axial direction of the rectangular outer edge wall, the cross-sectional area of ​​the soil dividing device gradually decreases from the head to the tail.

8. The quasi-rectangular shield soil segmentation and excavation device according to claim 7, characterized in that: The angle between the cross section of the tail of the soil dividing device and the rectangular outer edge wall is a right triangle perpendicular to the right triangle, so as to form a hollow soil bin within the angle of the right triangle.

9. The quasi-rectangular shield soil segmentation and excavation device according to claim 6, characterized in that: The area of ​​the seagull-shaped block is smaller than the area of ​​the blind spot, so that a gap is left between the seagull-shaped block and the rotation radius of the cutter disc.

10. The quasi-rectangular shield soil segmentation and excavation device according to claim 9, characterized in that: The gap between the seagull-shaped block and the rotation radius of the cutter disc is 2 cm.

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