Shield interval contact channel reverse-drawing-free construction structure

Abstract

The utility model relates to the technical field of shield tunnel construction, in particular to a non-reverse-drawing construction structure for a contact channel in a shield section. Comprising a tunnel entering section connected with a tunnel at a construction starting end and a standard section connected with a tunnel at a construction ending end; the tunnel entering section is of a gradual change section, the height of the tunnel entering section in the construction direction tends to be gradually increased, and the width of the tunnel entering section in the construction direction tends to be gradually increased; the heights of the standard sections are equal everywhere, and the widths of the standard sections are equal everywhere. According to the construction method, reverse digging construction of the connection channel is canceled, dismantling operation of an existing structure in a limited space is avoided, construction risks are reduced, construction efficiency of the connection channel is improved, and construction cost of the connection channel is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to shield tunnel construction technical field, especially a shield interval liaison passage no reverse excavation construction structure. BACKGROUND

[0002] The urban rail transit or part highway, railway tunnel adopts the structure type of the interval tunnel which is independently arranged in uplink and downlink (hereinafter referred to as interval main line) to meet the demand of different driving directions. In order to meet the relevant evacuation requirements, the interval uplink and downlink (or left and right line) tunnel usually needs to be arranged with liaison passage.

[0003] The interval tunnel of urban rail transit which is excavated by shield method has basically unified section size in China, and the structure type is generally circular reinforced concrete segment, the section size is 5.4-6.0m in diameter, and the structure thickness is 0.3-0.35m segment.

[0004] The existing liaison passage combines the building fireproof specification, and the inner clearance is 3m, and two fireproof doors are arranged. The bottom of the liaison passage is flush with the interval rail surface, and the section height is 3.85m. Because the liaison passage is generally constructed by the mine method, the curved arch straight wall section is adopted for the section type of the liaison passage. At present, the same section type is adopted for the whole liaison passage in China, that is, the section height and width of the whole liaison passage are consistent.

[0005] The liaison passage is generally excavated along the direction perpendicular to the interval main line from one end to the other end after the left and right lines are excavated.

[0006] The shield interval main line adopts the segment assembly structure, and because the bolt connection is adopted between the segment structures, the segments can only bear the pressure along the interval ring direction, and cannot bear the tension. The hole height at the position where the liaison passage of the interval main line is opened is 2.2m above the rail surface, and the opening range is generally 60°, otherwise the overall stability of the segments cannot be met.

[0007] Based on the above background, the mine method reverse excavation construction is generally adopted for the liaison passage at present, that is, the segments are first broken along a certain angle to excavate and support, and then the reverse excavation section is excavated in the reverse direction. The existing reverse excavation construction method has the following defects:

[0008] (1) The reverse excavation construction repeatedly disturbs the stratum, and needs to remove the original primary support, which can destroy the original stress balance system, so that the surrounding rock loses part or all of the support, especially in the soft surrounding rock section, which is easy to cause the collapse of the surrounding rock, and threatens the safety of the construction personnel and equipment;

[0009] (2) The narrow space within the connecting passage limits the space available for construction equipment and personnel, making it difficult to operate drilling equipment. For example, large rock drills may not be able to operate normally, and only small tools can be used for manual drilling, resulting in low construction efficiency. The working environment in the small space is complex and poorly ventilated, which may accumulate dust and harmful gases, easily leading to poisoning or occupational diseases for construction workers. At the same time, the narrow space restricts the operation of construction workers and the construction equipment cannot be used freely, increasing the probability of safety accidents such as collisions and crushing during construction.

[0010] (3) The connecting passage needs to be excavated at 30-60° first and then excavated in the opposite direction, which results in a waste of support structure and working time;

[0011] (4) In a small space, it is difficult to accurately control the range and depth of the chiseling, which may result in over-chiseling or incomplete chiseling: over-chiseling will further weaken the stability of the surrounding rock, while incomplete chiseling will fail to meet the requirements of the subsequent secondary lining construction.

[0012] (5) After the reverse excavation construction, it is difficult to connect the secondary lining structure with the main line segment. A large irregular ring beam needs to be set up, the reinforcement binding is difficult, the secondary lining concrete vibration is difficult, and the construction quality is difficult to control. Utility Model Content

[0013] The purpose of this utility model is to overcome the above-mentioned defects in the existing technology and propose a shield tunnel connection channel construction structure without back-cutting. This eliminates the back-cutting construction of the connection channel, avoids the demolition of the existing structure in a limited space, reduces construction risks, improves the construction efficiency of the connection channel, and reduces the construction cost of the connection channel.

[0014] The technical solution of this utility model is: a shield tunnel connecting passage construction structure without back-cutting, which includes an entrance section connected to the tunnel at the starting end of construction and a standard section connected to the tunnel at the ending end of construction.

[0015] The tunnel section has a gradually changing cross-section. The height of the tunnel section gradually increases along the construction direction, and the width of the tunnel section gradually increases along the construction direction.

[0016] The height and width of the standard section are the same everywhere.

[0017] In this invention, the tunnel entry section includes a top construction structure for the tunnel entry section. The top construction structure for the tunnel entry section is inclined, with an angle of 30-75° between it and the vertical direction. The bottom end of the top construction structure for the tunnel entry section is connected to the tunnel at the starting end of construction, and the top end of the top construction structure for the tunnel entry section is connected to the standard section.

[0018] The top construction structure of the entry section is arranged obliquely and extends along the length direction of the tunnel, and the angle between the two side edges of the top construction structure of the entry section along the length direction of the tunnel and the length direction of the tunnel is 30-75°, so that the width of the entry section gradually increases along the construction direction.

[0019] The entry section further comprises a side construction structure of the entry section, which is arranged along the vertical direction.

[0020] The standard section comprises a top construction structure of the standard section and a side construction structure of the standard section, the top construction structure of the standard section is a curved arc surface, and the side construction structure of the standard section is arranged along the vertical direction.

[0021] The top construction structure of the entry section, the side construction structure of the entry section, the top construction structure of the standard section and the side construction structure of the standard section all comprise primary support and secondary lining inside the primary support.

[0022] The entry section and the tunnel at the starting end of the construction, and the standard section and the tunnel at the ending end of the construction are fixedly connected through ring beams respectively, and the secondary lining and the ring beams are integrally poured.

[0023] The standard section is provided with a partition wall at the middle part along the construction direction, the partition wall is provided with fireproof plates and a plurality of pipeline passages.

[0024] The application has the following beneficial effects:

[0025] (1) The application improves the traditional cross section type of the communication passage, increases the gradually changing cross section along the construction direction while meeting the setting of fireproof doors and the requirement of evacuation, so that the primary support and the secondary lining at the entry section are gradually changed in structure;

[0026] (2) The application cancels the back-drilling construction of the communication passage, avoids the removal of the temporary primary support, reduces the construction risk, the construction difficulty and the operation in the narrow operation space;

[0027] (3) The application cancels the temporary primary support, so that the engineering cost and the construction period are saved, and the construction progress is accelerated, and the construction period of each communication passage is saved by about 15 days;

[0028] (4) The application reduces the temporary primary support construction and removal of the back-drilling section, and reduces the construction cost of the communication passage;

[0029] (5) In the construction structure of the application, the interface ring beams between the entry section and the tunnel segment and the interface ring beams between the standard section and the tunnel segment can all use the standard ring beam structure, which reduces the construction difficulty and improves the construction quality of the secondary lining. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a top view structural schematic diagram of the construction structure;

[0031] Figure 2 is Figure 1 A-A sectional view structural schematic diagram in the

[0032] Figure 3 is a B-B sectional view structural schematic diagram in 1 in the figure.

[0033] In the figure: 1 interval left line tunnel segment; 2 interval right line tunnel segment; 3 entry hole section; 4 standard section; 5 initial support; 6 secondary lining; 7 ring beam; 8 partition wall; 9 fire door; 10 pipeline passage. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0035] In the following description, specific details are set forth in order to provide a thorough understanding of the utility model. However, the utility model can be practiced in a variety of manners other than those described herein, and persons skilled in the art can make similar generalizations without departing from the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below.

[0036] The utility model provides a kind of shield interval liaison passage no backout construction structure, liaison passage is the passage or door hole of connecting two driving tunnels of uplink or left and right line on the same line interval, when train is in interval disaster, such as fire disaster, outage, passenger is used by accident tunnel to no accident tunnel safe evacuation.This embodiment's liaison passage is used to connect left line tunnel and right line tunnel.

[0037] The liaison passage in the embodiment starts construction excavation from one end connected with left line tunnel, until being connected with right line tunnel.As shown in Figure 1 And Figure 2 The utility model discloses a kind of shield interval liaison passage no backout construction structure, including entry hole section 3 and standard section 4, wherein, entry hole section 3 is connected with the tunnel segment of construction starting end, standard section is located between the tunnel of construction end and entry hole section, entry hole section and standard section are integrated structure.

[0038] Entry hole section 3 connected with the left line tunnel of construction starting end is gradually changed section. Gradually changed section of entry hole section includes entry hole section top construction structure, entry hole section side construction structure and entry hole section bottom surface construction structure. Entry hole section top construction structure is inclinedly arranged, and the included angle between it and horizontal direction is 30-75 °, as Figure 2As shown, the bottom end of the top construction structure of the entry section is connected with the tunnel segment 1 on the left side of the section, and the top end of the top construction structure of the entry section is integrally connected with the standard section. Along the construction direction, the height of the entry section 3 gradually increases.

[0039] The top construction structure of the entry section is arranged obliquely along the length direction of the tunnel, and the angle between the two side edges of the top construction structure of the entry section along the length direction of the tunnel and the length direction of the tunnel is 50-75°, as shown. The width of the entry section 3 gradually increases. The length of the entry section is determined according to the length of the communication passage in the actual construction process, and is usually not greater than 2 m. Figure 1

[0040] The side construction structure of the entry section is arranged along the vertical direction, and the side construction structure of the entry section is vertically arranged with the bottom construction structure of the entry section. The top construction structure of the entry section, the side construction structure of the entry section and the bottom construction structure of the entry section form the construction space of the entry section.

[0041] The standard section 4 is located between the entry section and the right-line tunnel at the end of the construction. The standard section includes a top construction structure of the standard section, a side construction structure of the standard section and a bottom construction structure of the standard section. The top construction structure of the standard section adopts a curved arch surface, and the top construction structure of the standard section is arranged along the horizontal direction, so that the distance between the top construction structure of the standard section and the bottom construction structure of the standard section is equal everywhere.

[0042] The side construction structure of the standard section and the bottom construction structure of the standard section are vertically arranged, and the distance between the side construction structures of the standard section on both sides is equal everywhere. The top construction structure of the standard section, the side construction structure of the standard section and the bottom construction structure of the standard section form the construction space of the standard section, and the construction space of the standard section is communicated with the construction space of the entry section.

[0043] The top construction structure of the entry section, the side construction structure of the entry section, the top construction structure of the standard section and the side construction structure of the standard section all include a primary support 5 and a secondary lining 6 inside the primary support 5. The primary support 5 is a temporary support structure. After the entry section and the standard section are excavated, the primary support is immediately constructed to timely control the deformation of the surrounding rock, prevent the surrounding rock from relaxing and collapsing, ensure the safety of the construction and the smooth progress of the subsequent operation.

[0044] The secondary lining 6 is a concrete lining structure constructed inside the primary support. The secondary lining 6 and the primary support 5 jointly form a composite lining, which further improves the bearing capacity, waterproof performance and structural durability of the communication passage.

[0045] ​The in-hole section 3 and the interval left line tunnel segment 1, and the standard section 4 and the interval right line tunnel segment 2 are fixedly connected through the ring beam 7, and the ring beam 7 and the secondary lining 6 are integrally casted at one time, so as to realize the fixed connection between the construction structure and the tunnel segments on both sides.

[0046] The standard section 4 is provided with a fireproof door 9 at the middle part along the construction direction. Figure 3 As shown in the figure, the standard section is provided with a retaining wall 8 at the middle part along the construction direction, and the retaining wall 8 is provided with the fireproof door 9. Meanwhile, the retaining wall is also provided with a plurality of pipeline passages 10, so as to facilitate the pipeline to pass through.

[0047] When the construction of the connecting passage is completed by using the construction structure described in the application, first, the interval left and right line tunnels are excavated, and the tunnel inner segment at the opening position of the connecting passage is adjusted to be a through joint.

[0048] Secondly, the interval line on one side is excavated to the interval line on the other side, and in the embodiment, the interval left line is excavated to the interval right line.

[0049] During the excavation process, first, the in-hole section 3 is excavated, the expansion angle of the in-hole section in the horizontal direction is 30-75°, and the expansion angle of the in-hole section in the vertical direction is 30-75°, that is, the height and the width of the in-hole section along the construction direction both gradually increase. The length of the in-hole section is usually determined according to the actual length of the connecting passage in the actual construction process. After each step of excavation is completed, the initial support needs to be constructed in time.

[0050] After the excavation of the in-hole section is completed, the standard section is excavated, so as to complete the excavation of the connecting passage.

[0051] Thirdly, after the excavation of the standard section is completed, the secondary lining is casted inside the initial support, the ring beam 7 is casted at the connection between the in-hole section 3 and the interval left line tunnel segment 1, and at the connection between the standard section 4 and the interval right line tunnel segment 2, and the secondary lining 6 and the ring beam 7 can be integrally casted at one time. Finally, the installation of the fireproof door 9 and the pipeline in the connecting passage is completed.

[0052] By using the construction structure described in the application, the back excavation construction of the connecting passage can be cancelled, the temporary initial support is avoided to be removed, the construction risk is reduced, and the construction difficulty and the operation in the narrow operation space are reduced.

[0053] The shield section connecting passage reverse excavation construction structure is described in detail. The principle and implementation mode of the utility model are described by applying specific examples. The above description of the embodiments is only used to help understand the method and core idea of the utility model. It should be pointed out that the ordinary skilled in the art can make some improvements and modifications to the utility model without departing from the principle of the utility model. These improvements and modifications also fall within the protection scope of the utility model claims. The above description of the disclosed embodiments enables the person skilled in the art to implement or use the utility model. Various modifications of the embodiments will be apparent to the person skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shield section connecting passage non-backbreaking construction structure, characterized in that, The tunnel comprises an entrance section connected with the tunnel at the starting end of construction and a standard section connected with the tunnel at the ending end of construction; The entrance section has a gradually changing cross section, and the height of the entrance section gradually increases along the construction direction, and the width of the entrance section gradually increases along the construction direction; The height of the standard section is equal everywhere, and the width of the standard section is equal everywhere.

2. The construction structure of a shield section connecting passage without backbreaking according to claim 1, characterized in that, The entrance section comprises an entrance section top construction structure, which is arranged obliquely at an angle of 30-75° with the vertical direction, and the bottom end of the entrance section top construction structure is connected with the tunnel at the starting end of construction, and the top end of the entrance section top construction structure is connected with the standard section. The obliquely arranged entrance section top construction structure extends along the length direction of the tunnel, and the angle between the two side edges of the entrance section top construction structure along the length direction of the tunnel and the length direction of the tunnel is 30-75°, so that the width of the entrance section gradually increases along the construction direction.

3. The construction structure of a shield section connecting passage without backbreaking according to claim 2, characterized in that, The entrance section further comprises an entrance section side construction structure, which is arranged along the vertical direction.

4. The construction structure of a shield section connecting passage without backbreaking according to claim 3, characterized in that, The standard section comprises a standard section top construction structure and a standard section side construction structure, the standard section top construction structure is in a curved arc shape, and the standard section side construction structure is arranged along the vertical direction.

5. The construction structure of a shield section connecting passage without backbreaking according to claim 3, characterized in that, The entrance section top construction structure, the entrance section side construction structure, the standard section top construction structure and the standard section side construction structure all comprise primary support and secondary lining inside the primary support; The entrance section and the tunnel at the starting end of construction, and the standard section and the tunnel at the ending end of construction are fixedly connected through ring beams respectively, and the secondary lining and the ring beams are integrally poured.

6. The construction structure of a shield section connecting passage without backbreaking according to claim 1, characterized in that, The standard section is provided with a partition wall at the middle part along the construction direction, the partition wall is provided with fireproof doors and a plurality of pipeline passages.

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