A combined structure and receiving method for shield tunneling receivers

Abstract

This invention provides a combined structure for shield tunneling reception, mounted on the main structure of a station. It includes a bamboo-cutting steel sleeve, inclinedly mounted on the inner wall of the side wall of the main station structure. An opening, identical in size to the bamboo-cutting steel sleeve, connects with the sleeve. An external station retaining structure is added to the side wall of the main station structure. The outer side of the retaining structure is reinforced with plain concrete piles, forming a trapezoidal reinforcement zone. The central axis of the bamboo-cutting steel sleeve coincides with the shield tunneling axis, enabling oblique shield tunneling reception. This invention solves the problems of difficult tunneling and high unidirectional force on the cutterhead during reception. It ensures planar contact between the cutterhead panel, the end retaining structure, and the trapezoidal reinforcement zone formed by the outer plain concrete piles, resulting in uniform force distribution during cutting of the retaining structure. This uniform force distribution on the cutterhead prevents damage and improves the success rate of shield tunneling reception.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, specifically to a combined structure and receiving method for shield tunneling receivers. Background Technology

[0002] With the large-scale construction of shield tunnels, safe shield reception is a critical link and a significant source of risk in engineering construction. Conventional shield reception is conducted horizontally. However, under certain conditions, considering the difficulties of excavation and the stress after reception, inclined shield reception is more suitable. Current technology lacks relevant structures and methods for inclined shield reception, and no standards have been established. During construction, this easily leads to problems such as the shield's excavation axis not being perpendicular to the receiving end wall; the cutterhead panel not forming planar contact with the end retaining structure, resulting in uneven force cutting of the retaining structure; and due to the lack of guidance from the shield reception assembly structure, if the shield's excavation axis is not perpendicular to the end wall, the non-planar contact between the cutterhead and the retaining structure will cause uneven force on the cutterhead, leading to shield machine tilting, twisting, and even damage to the cutterhead and cutters, potentially causing shield reception failure in severe cases. Therefore, the required angle between the shield's excavation axis and the end wall limits the design of the shield tunnel alignment and the arrangement of the shield receiving end, greatly restricting the realization and optimization of tunnel alignment schemes.

[0003] The receiving methods provided in the existing technology do not provide conditions for oblique receiving of shield tunnels, so they cannot be adapted to oblique receiving and do not have the characteristics of increasing the flexibility of shield tunnel alignment and receiving end arrangement. Summary of the Invention

[0004] In view of the problems existing in the background technology, the present invention provides a combined structure for shield receiving, which realizes oblique shield receiving and solves the problems of lack of guiding structure for shield receiving in the prior art, easy damage to cutterhead and difficulty in tunneling during construction.

[0005] This invention provides a combined structure for receiving a tunnel boring machine (TBM), mounted on the main structure of a station. The main structure includes a station floor slab, side walls, and a central slab. The combined structure comprises a bamboo-shaped steel sleeve, which is inclined at less than 90° on the inner wall of the side wall. An opening is formed at the connection point between the sleeve and the opening, which abuts against the bamboo-shaped steel sleeve and is the same size. An external station enclosure structure is added to the outside of the side wall. The outer side of the enclosure structure is reinforced with plain concrete piles, forming a trapezoidal reinforcement zone. The outer edge of the trapezoidal reinforcement zone is perpendicular to the central axis of the TBM tunneling, and the inner edge is parallel to the station enclosure structure. The central axis of the bamboo-shaped steel sleeve coincides with the central axis of the TBM tunneling, enabling oblique TBM reception.

[0006] Furthermore, a pre-embedded steel ring plate is installed along the outer perimeter of the portal, and the connection between the bamboo-shaped steel sleeve and the inner wall of the side wall of the main structure of the station is welded tightly through the pre-embedded steel ring plate.

[0007] Furthermore, the plain concrete piles have a diameter of 1m and an interlocking diameter of 200mm; when the tunnel boring machine (TBM) enters the trapezoidal reinforcement zone, its upper and lower surfaces enclose the TBM, and the depth of the trapezoidal reinforcement zone is from 3m above the tunnel arch to 3m below the tunnel bottom.

[0008] Furthermore, the bamboo-shaving steel sleeve is composed of a rear end cap, a cylinder body, and a bamboo-shaving end face.

[0009] The present invention also provides a shield receiving method, using the above-described shield receiving combination structure, comprising the following steps:

[0010] S1. Construction station main structure;

[0011] S2. After the main structure of the station is completed and before the tunnel boring machine is started, plain concrete piles are constructed to form a trapezoidal reinforcement zone.

[0012] S3. Install a bamboo-cutting steel sleeve before the shield tunneling machine receives the shield.

[0013] S4. Tightness test of bamboo-cut steel sleeve;

[0014] S5, cutting plain concrete piles and station retaining structures, receiving the shield tunneling machine, and the shield machine enters the bamboo-cutting steel sleeve at an angle.

[0015] S6. When receiving the shield, the tail section is assembled and synchronous grouting is strengthened. After the water is sealed at the tunnel entrance through grouting, the steel sleeve is depressurized and disassembled, thereby completing the oblique receiving of the shield.

[0016] Furthermore, step S1, which involves constructing the main structure of the station, specifically includes:

[0017] S11, Construction station enclosure structure;

[0018] S12. Pour the station base slab, the side walls of the main station structure and the ring beam frame. When pouring the end walls of the main station structure, embed steel ring plates to form a doorway on the inside of the steel ring plates.

[0019] S12, pouring the middle slab of the station.

[0020] Furthermore, the bamboo-cutting steel sleeve is inclinedly installed on the inner wall of the side wall of the main structure of the station, abutting against the tunnel entrance and being the same size; the outer edge of the trapezoidal reinforcement area is perpendicular to the shield tunneling centerline, and the shield tunneling centerline coincides with the central axis of the bamboo-cutting steel sleeve.

[0021] The combined structure and receiving method for shield tunneling receivers of the present invention have the following technical advantages:

[0022] (1) The combined structure and method of shield receiving realizes the oblique shield receiving, uses bamboo-cutting steel sleeve to support the shield machine, and designs a combined structure of the tunnel entrance, plain concrete piles and retaining structure, which solves the problems of difficult tunneling and large unidirectional force on the shield cutterhead during receiving.

[0023] (2) In the shield receiving assembly structure of the present invention, the shield tunneling axis is kept perpendicular to the receiving end (trapezoidal reinforcement area) during construction; the cutterhead panel and the receiving end (trapezoidal reinforcement area) form a planar contact, thereby uniformly cutting the retaining structure; the present invention relates to the guidance of the shield receiving assembly structure, the outer edge of the trapezoidal reinforcement area is perpendicular to the shield tunneling axis, the shield tunneling axis and the receiving end wall do not need to be perpendicular, that is, the cutterhead panel and the end retaining structure do not need to be parallel, that is, to realize the oblique reception of the shield at any angle (without verticality), the cutterhead is uniformly stressed, avoids damage, improves the shield receiving success rate, and realizes the controllable attitude of the shield machine.

[0024] (3) The trapezoidal reinforcement zone formed by plain concrete piles has a strength much greater than that of the original soil and is stronger than that of conventional jet grouting piles and cement-soil piles, which can better ensure the stability of the strata at the tunnel boring machine (TBM) end during TBM reception. At the same time, the strength grade can be adjusted to control the strength more accurately, so that the strength of the concrete piles is equal to the strength of the station retaining structure. The strength change during TBM cutting and entry is reduced, the TBM parameters fluctuate less, and the TBM attitude is easier to control. The pre-embedded annular inner wall of the tunnel portal provides a safe and reliable steel sleeve connection interface, which is conducive to forming a closed and safe receiving space. Attached Figure Description

[0025] Figure 1 This is a plan view of the shield receiving assembly structure of the present invention;

[0026] Figure 2 for Figure 1 View from direction A in the middle;

[0027] Figure 3 for Figure 1 View from direction B;

[0028] Figure 4 for Figure 1 A view of the shield tunneling machine before it receives the receiver in direction C;

[0029] Figure 5 for Figure 1 View from direction C after the shield tunneling machine has received the data;

[0030] In the diagram: 101. Outline of the tunnel boring machine before reception; 102. Tunnel segment; 103. Station retaining structure; 104. Side wall of the main station structure; 105. End wall of the main station structure; 106. Station middle slab; 107. Ring frame beam; 108. Station floor slab; 109. Portal; 201. Bamboo-cut steel sleeve; 202. Plain concrete pile; 203. Embedded steel ring plate; 204. Grouting pipe; 205. Trapezoidal reinforcement zone; 206. Outline of the tunnel boring machine after reception. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely one embodiment of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This embodiment provides a combined structure for shield tunneling reception, providing conditions for oblique shield tunneling reception, in conjunction with the appendix. Figure 1 To be continued Figure 3 The combined structure is installed on the main structure of the station. Even when the tunnel boring machine's (TBM) excavation axis is oblique to the end wall, the TBM can still excavate smoothly and be safely received. The design principle of this invention is as follows: a steel sleeve is installed on the inner wall of the main station structure (end wall 105 of the main station structure), and a trapezoidal reinforcement area is installed on the outside of the main station structure (station enclosure structure 103). This ensures that the TBM is aligned with the trapezoidal reinforcement area and inserted into the steel sleeve inside the main station structure. (See attached diagram). Figure 1-3 , attached Figure 1 This is a plan view of the shield receiving assembly structure of the present invention. Figure 2 for Figure 1 View from direction A in the middle. Figure 3 for Figure 1 In the view from direction B, the combined structure of this embodiment is set on the main station structure. The main station structure includes a station floor slab 108, a station main structure side wall 104, and a station center slab 106. The shield receiving combined structure includes a bamboo-cut steel sleeve 201. The bamboo-cut steel sleeve 201 is inclined on the inner wall of the station main structure side wall 104 with an inclination angle of less than 90°. A portal 109 is opened at the connection between the two. The portal 109 abuts against the bamboo-cut steel sleeve 201 and is the same size. A station enclosure structure 103 is added to the outside of the station main structure side wall 104. The outer side of the station enclosure structure 103 is reinforced with plain concrete piles 202 to form a trapezoidal reinforcement area 205. The outer edge of the trapezoidal reinforcement area 205 is perpendicular to the shield tunneling centerline, and the inner edge is parallel to the station enclosure structure 103. The central axis of the bamboo-cut steel sleeve 201 coincides with the shield tunneling centerline to achieve oblique shield receiving.

[0033] An embedded steel ring plate 203 is provided along the outer periphery of the tunnel portal 109. The connection between the bamboo-shaped steel sleeve 201 and the inner wall of the side wall 104 of the main structure of the station is welded tightly by the embedded steel ring plate 203, which is used to enclose the tunnel portal 109 and fix the bamboo-shaped steel sleeve 201.

[0034] Plain concrete pile 202 has a diameter of 1m and a pile interlocking of 200mm; when the tunnel boring machine enters the trapezoidal reinforcement zone 205, the upper and lower bottom surfaces of the trapezoidal reinforcement zone 205 enclose the tunnel boring machine, and the depth of the trapezoidal reinforcement zone 205 is from 3m above the tunnel arch to 3m below the tunnel bottom.

[0035] The bamboo-cutting steel sleeve 201 consists of a rear end cap, a cylinder body, and a bamboo-cutting end face. The bamboo-cutting end face resembles a bamboo pole cut at an angle. This end face connects to the inner wall of the side wall 104 of the station's main structure. The rear end cap can have an arc-shaped design. (See attached diagram.) Figure 1 Appendix Figure 4 With appendix Figure 5 , attached Figure 4 With appendix Figure 5 The images show views of the shield receiving process in the C direction before and after receiving the shield, respectively. During the shield tunneling process, the shield at the front end of the shield segment 102 is finally received by the bamboo-cutting steel sleeve 201. The shield outline 101 before final reception corresponds to the shield outline 206 after reception in the bamboo-cutting steel sleeve 201. After reception, grouting is performed through the grouting pipe 204 at the trapezoidal reinforcement zone 205 to provide grouting sealing and water-stopping function. That is, after grouting, groundwater outside the station can be prevented from flowing into the station through the gap between the outer wall of the shield segment 102 and the inner wall of the pre-embedded steel ring plate 203, thus achieving the purpose of joint water-stopping.

[0036] This embodiment also provides a shield receiving method, using the above-described shield receiving combination structure, including the following steps:

[0037] S1. Construction station main structure;

[0038] S2. After the main structure of the station is completed and before the tunnel boring machine is started, plain concrete piles 202 are constructed to form a trapezoidal reinforcement zone 205.

[0039] S3. Install bamboo-cutting steel sleeve 201 before shield receiving;

[0040] S4. Tightness test of 201 bamboo-cut steel sleeve;

[0041] S5, cutting plain concrete piles 202 and station retaining structure 103, to receive the shield, the shield machine enters the bamboo-cutting steel sleeve 201 at an angle;

[0042] S6. When receiving the shield, the shield tail segments are assembled and synchronous grouting is strengthened. After the water is stopped at the tunnel portal 109 by grouting, the pressure is released and the bamboo-shaped steel sleeve 201 is disassembled, thereby completing the oblique receiving of the shield.

[0043] Step S1 involves constructing the main structure of the station, specifically including:

[0044] S11, Construction station enclosure structure;

[0045] S12. Pour the station base slab, the side walls of the main station structure and the ring beam frame. When pouring the end walls of the main station structure, embed steel ring plates to form a doorway on the inside of the steel ring plates.

[0046] S13, pouring the middle slab of the station.

[0047] The bamboo-cutting steel sleeve 201 is inclinedly installed on the inner wall of the side wall 104 of the main structure of the station, abutting against the tunnel portal 109 and being the same size; the outer edge of the trapezoidal reinforcement area 205 is perpendicular to the shield tunneling centerline, and the shield tunneling centerline coincides with the central axis of the bamboo-cutting steel sleeve 201.

[0048] The shield receiving assembly structure and method of the present invention realizes the oblique shield receiving, uses the bamboo-cutting steel sleeve 201 to support the shield machine, and designs a combined structure of opening 109, plain concrete piles and retaining structure, which solves the problems of difficult tunneling and large unidirectional force on the shield cutterhead during receiving.

[0049] The shield receiving assembly structure of the present invention ensures that the shield tunneling axis is perpendicular to the receiving end (trapezoidal reinforcement area 205) during construction; the cutterhead panel and the receiving end (trapezoidal reinforcement area 205) form a planar contact, thereby uniformly distributing force to cut the station enclosure structure 103; the present invention relates to the guidance of the shield receiving assembly structure, the outer edge of the trapezoidal reinforcement area 205 is perpendicular to the shield tunneling axis, the shield tunneling axis does not need to be perpendicular to the receiving end wall, that is, the cutterhead panel and the end enclosure structure do not need to be parallel, so as to realize the oblique reception of the shield at any angle (without perpendicularity), the cutterhead is uniformly stressed, avoids damage, improves the shield reception success rate, and realizes controllable shield machine attitude.

[0050] The trapezoidal reinforcement zone 205 formed by the plain concrete piles 202 has a strength far greater than that of the original soil and is stronger than that of conventional jet grouting piles and cement-soil piles, which can better ensure the stability of the strata at the tunnel boring machine (TBM) end during TBM reception. Simultaneously, the strength grade can be adjusted to more accurately control the strength, ensuring that the strength of the plain concrete piles 202 equals the strength of the station retaining structure 103. This reduces strength changes and minimizes fluctuations in TBM parameters during TBM cutting, making it easier to control the TBM's attitude. The pre-embedded annular inner wall of the portal 109 provides a safe and reliable steel sleeve connection interface, facilitating the formation of a closed and secure receiving space.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Terms such as "upper," "lower," "front," "rear," "vertical," "horizontal," "inner," and "outer" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of the invention.

[0052] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A combined structure for receiving tunnel boring machines (TBMs), mounted on the main structure of a station, the main structure comprising a station floor slab, station side walls, and a station center slab, characterized in that, The shield receiving assembly includes a bamboo-shaped steel sleeve, which is inclinedly installed on the inner wall of the side wall of the main station structure with an inclination angle of less than 90°. A portal is opened at the connection between the two, and the portal abuts against the bamboo-shaped steel sleeve and is the same size. A station retaining structure is added to the outside of the side wall of the main station structure. The outer side of the station retaining structure is reinforced with plain concrete piles to form a trapezoidal reinforcement zone. The outer edge of the trapezoidal reinforcement zone is perpendicular to the shield tunneling centerline, and the inner edge is parallel to the station retaining structure. The central axis of the bamboo-shaped steel sleeve coincides with the shield tunneling centerline to achieve oblique shield receiving.

2. The combined structure for receiving tunnel boring machines according to claim 1, characterized in that, An embedded steel ring plate is installed along the outer perimeter of the portal, and the connection between the bamboo-shaped steel sleeve and the inner wall of the side wall of the main structure of the station is welded tightly through the embedded steel ring plate.

3. The combined structure for receiving tunnel boring machines according to claim 1, characterized in that, The plain concrete piles are 1m in diameter and have a 200mm interlocking thickness. When the tunnel boring machine (TBM) enters the trapezoidal reinforcement zone, its upper and lower surfaces enclose the TBM. The depth of the trapezoidal reinforcement zone is from 3m above the tunnel arch to 3m below the tunnel floor.

4. The combined structure for receiving tunnel boring machines according to claim 1, characterized in that, The bamboo-cutting steel sleeve consists of a rear end cap, a cylinder body, and a bamboo-cutting end face.

5. A shield tunneling receiving method, using the combined structure of shield tunneling receiving according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Construction station main structure; S2. After the main structure of the station is completed and before the tunnel boring machine is started, plain concrete piles are constructed to form a trapezoidal reinforcement zone. S3. Install a bamboo-cutting steel sleeve before the shield tunneling machine receives the shield. S4. Tightness test of bamboo-cut steel sleeve; S5, cutting plain concrete piles and station retaining structures, receiving the shield tunneling machine, and the shield machine enters the bamboo-cutting steel sleeve at an angle. S6. When receiving the shield, the tail section is assembled and synchronous grouting is strengthened. After the water is sealed at the tunnel entrance through grouting, the steel sleeve is depressurized and disassembled, thereby completing the oblique receiving of the shield.

6. The shield receiving method according to claim 5, characterized in that, The construction of the main station structure in step S1 specifically includes: S11, Construction station enclosure structure; S12. Pour the station base slab, the side walls of the main station structure and the ring beam frame. When pouring the end walls of the main station structure, embed steel ring plates to form a doorway on the inside of the steel ring plates. S13, pouring the middle slab of the station.

7. The shield receiving method according to claim 6, characterized in that, The bamboo-cutting steel sleeve is inclinedly installed on the inner wall of the side wall of the main structure of the station, abutting against the tunnel entrance and being the same size; the outer edge of the trapezoidal reinforcement area is perpendicular to the shield tunneling centerline, and the shield tunneling centerline coincides with the central axis of the bamboo-cutting steel sleeve.

Images