CN120061855A - Rectangular push bench for inclined shaft in underground space and construction method thereof - Google Patents

Abstract

The invention discloses an underground space inclined shaft rectangular push bench and a construction method thereof, wherein the underground space inclined shaft rectangular push bench comprises a roller-type main machine, one side of the roller-type main machine is projected into a parallelogram and comprises an inner shield body and an outer shield body which are detachably connected, the front ends of the inner shield body and the outer shield body are respectively provided with mutually independent roller cutterheads, the pushing system at the rear end of the outer shield body and the pushing direction of a rectangular pipe joint are parallel to the axis of the outer shield body, the rear end of the inner shield body is provided with a grouting pipe, a slag discharging pipe and a traction system, and the inclined shaft face excavated by each roller cutterhead is parallel to the bottom surface of an originating tunnel in the originating and jacking processes. The technical scheme provided by the invention not only solves the problems of large occupied starting space and difficult equipment access, but also solves the problems of difficult rollback of the push bench and incapability of grouting and back cover in blind well construction in the prior art, and can realize side-band pressure rollback and side grouting and back cover.

Description

Rectangular push bench for inclined shaft in underground space and construction method thereof

Technical Field

The invention relates to the technical field of inclined shaft jacking pipe construction, in particular to an underground space inclined shaft rectangular jacking pipe machine and a construction method thereof.

Background

The underground space inclined shaft is an inclined channel for connecting the ground and an underground structure or an adjacent underground structure, and is generally used for constructing an inclined escalator between a station hall layer and a station platform layer of a subway station. In the construction of underground space, the construction method of the inclined shaft of the underground space is various, wherein the pipe jacking method is widely applied to urban underground engineering due to the advantages of non-excavation construction. The pipe jacking method construction gradually forms a tunnel by jacking the prefabricated pipe joints in the working well, and has the advantages of high construction speed, small influence on the ground and the like.

However, as shown in fig. 9, in the case of performing the underground space inclined shaft construction, the existing push bench 100 needs to be arranged obliquely with respect to the existing tunnel 200, so that the originating space required by the existing push bench 100 is relatively large, the internal space of the existing tunnel 200 cannot meet the originating arrangement of the existing push bench 100, the existing push bench 100 occupies the peripheral space 300 of the existing tunnel 200 before originating, the peripheral space 300 needs to be excavated by adopting a freezing method or a mining method, an originating cavity meeting the existing push bench 100 is enlarged, and then the originating arrangement of the existing push bench 100 can be performed.

In addition, as shown in fig. 10, after the inclined shaft of the underground space is driven in place, the tunnel face 400 needs to be sealed by adopting concrete slurry, and the ideal bottom sealing concrete slurry 500 should cover the tunnel face 400 all the time, i.e. the vertical section of the ideal bottom sealing concrete slurry 500 is approximately rectangular, one side covers the tunnel face 400, and the other side is sealed under pressure by the existing pipe push bench 100. However, in actual situations, the conventional push bench 100 cannot be applied as the ideal bottom sealing concrete slurry 500, that is, the concrete slurry will naturally accumulate at the bottom of the slurry tank due to the action of gravity, the vertical section of the actual bottom sealing concrete slurry 600 is triangular, and the theoretical concrete slurry level 700 is much greater than the actual bottom sealing concrete slurry level 800, so that the bottom sealing requirement on the upper portion of the tunnel face 400 cannot be met.

Although the patent of the utility model with the authority bulletin day being 2020.05.19 and the authority bulletin number being CN210564534U discloses a rectangular pipe jacking bias construction structure which comprises a pipe jacking machine and a pipe jacking well for placing the pipe jacking machine, the technical problems which cannot be solved still exist in practical application, namely, 1, the rectangular pipe jacking machine occupies large starting space, which can lead to the shortage of construction site space and influence the construction efficiency, 2, the difficulty in entering an existing tunnel is that the traditional rectangular pipe jacking machine can face the problems of space limitation and poor equipment adaptability when entering the existing tunnel, the construction complexity and risk are increased, 3, the construction flexibility is poor, the construction requirement under different geological conditions is difficult to meet in the complex geological conditions, particularly in the geological environment with soft soil and rock strata alternation, the construction efficiency is low, and even the construction failure is likely to occur in the prior art.

In view of the foregoing, there is a need for a push bench that occupies a small space for originating and receiving and can achieve ideal construction of back-up concrete slurry, so as to improve the construction efficiency and quality of the inclined shaft in the underground space.

It should be noted in particular that the above technical information is only intended to enhance understanding of the general background of the invention, and should not be taken as an admission or any form of suggestion that the above technical information constitutes prior art already known to a person skilled in the art.

Disclosure of Invention

Aiming at the defects in the background technology, the invention provides an underground space inclined shaft rectangular push bench and a construction method thereof, and aims to solve the technical problems of reducing the occupation of an initial receiving space and performing ideal bottom sealing concrete slurry construction so as to improve the construction efficiency and the construction quality of an underground space inclined shaft.

The technical scheme of the invention is as follows:

The utility model provides a rectangular push bench of underground space inclined shaft and construction method thereof, including the cylinder host computer, the projection of one side of cylinder host computer is parallelogram and including the interior shield body and the outer shield body of detachable connection, the front end of interior shield body, the outer shield body is provided with mutually independent drum-type blade disc respectively, the top pushing system of outer shield body rear end and the top pushing direction of rectangular tube coupling are all parallel with the axis of outer shield body, interior shield body rear end is provided with the slip casting pipe that is used for the slip casting when advancing and the back is used for exhaust when advancing, be used for the slag discharging when advancing and be used for filling the scum pipe of back concrete when backing, be used for the traction system of drawing interior shield body when backing off, in originating and advancing the in-process, the inclined shaft face that each drum-type blade disc excavated is parallel with the bottom surface of originating tunnel.

On the basis of the technical scheme, as the preferable technical scheme of the inclined shaft rectangular push bench in the underground space, the projection of one side of the pushing system and the rectangular pipe joint and the projection of one side of the integral structure after the pushing system, the rectangular pipe joint and the outer shield body are sequentially contacted are parallelograms.

On the basis of the technical scheme, the pushing system comprises a top supporting shoe, pushing oil cylinders and a top iron which are sequentially connected, wherein the pushing directions of a plurality of pushing oil cylinders between the top supporting shoe and the top iron are parallel to the axis of the outer shield body.

On the basis of the technical scheme, as the preferable technical scheme of the inclined shaft rectangular push bench in the underground space, the shape of the rear end face of the outer shield body is the same as that of the rear end face of the rectangular pipe joint and comprises a first supporting face, a second supporting face, a third supporting face and a fourth supporting face which are respectively matched with the front end face of the rectangular pipe joint or the front end face of the top iron, the second supporting face and the fourth supporting face are parallel to the bottom face of the originating tunnel, and the first supporting face and the third supporting face are perpendicular to the pushing direction.

On the basis of the technical scheme, as the preferable technical scheme of the inclined shaft rectangular push bench in the underground space, the rear end of the top iron and the front end of the top supporting shoe are provided with a plurality of oil cylinder supporting surfaces, and each oil cylinder supporting surface is perpendicular to the pushing direction.

On the basis of the technical scheme, the drum-type cutter head comprises a plurality of drum cutting units as the preferable technical scheme of the inclined shaft rectangular push bench in the underground space.

On the basis of the technical scheme, as the preferable technical scheme of the inclined shaft rectangular push bench in the underground space, the roller cutting unit comprises a built-in motor for driving the roller to rotate, and a plurality of hob and/or cutting teeth are arranged on the outer surface of the roller.

A construction method of an underground space inclined shaft rectangular pipe pushing bench adopts the underground space inclined shaft rectangular pipe pushing bench according to any one of the technical schemes to carry out blind shaft construction and inner shield body rollback construction.

On the basis of the technical scheme, the technical scheme is that the construction method of the inclined shaft rectangular pipe jacking machine in the underground space is used as the preferable technical scheme, when blind shaft construction is carried out, after the pushing system is arranged at the top of the initial tunnel to push the drum-type main machine to dig in and out of the rectangular pipe joint installation space, the pushing system is retracted, the rectangular pipe joint is lowered at the rear end of the drum-type main machine, then the pushing system pushes the drum-type main machine through the rectangular pipe joint to continuously dig a new rectangular pipe joint installation space downwards, and then the new rectangular pipe joint is installed, so that circulation is carried out until the drum-type cutterhead digs to the bottom of the inclined shaft.

On the basis of the technical scheme, the technical scheme is preferable as a construction method of the inclined shaft rectangular pipe jacking machine in the underground space, grouting bottom sealing construction is carried out while inner shield body rollback construction is carried out, a connecting structure between the inner shield body and the outer shield body is removed, bottom sealing concrete is injected into the inclined shaft face through a slag discharge pipe, air in the inclined shaft face is discharged through a grouting pipe, meanwhile, under the effect of pressure of the face, the inner shield body is slowly rolled back along the outer shield body by utilizing a traction system, and after grouting bottom sealing construction is completed, the inner shield body is completely separated from the outer shield body until rollback to an originating tunnel by utilizing the traction system.

When a constructed receiving tunnel exists, the underground space inclined shaft rectangular pipe pushing jack adopts any one of the technical schemes to carry out penetrating construction, and a receiving sleeve for receiving a roller type host is arranged in the receiving tunnel.

Compared with the prior art, the rectangular push bench for the inclined shaft in the underground space and the construction method thereof not only reduce the occupation of the initial receiving space, but also can perform ideal bottom sealing concrete slurry application, thereby improving the construction efficiency and the construction quality of the inclined shaft in the underground space. The technical scheme provided by the invention not only solves the problems of large occupied space and difficult equipment access, but also solves the problems of difficult rollback of the push bench and incapability of grouting and back cover in blind well construction in the prior art, and particularly can realize side-band rollback and side grouting and back cover after tunneling in place, thereby further improving the safety and quality of construction and avoiding the potential safety hazard caused by incapability of realizing grouting and back cover in the prior art.

The push bench has the advantages that the push bench is compact in structural design, small in initial receiving space occupation, capable of meeting the requirements of oblique initial and receiving, and capable of solving the problems that the existing push bench is large in occupied space and needs to expand and dig an initial tunnel. And secondly, when the blind well is constructed, the side-band pressure-rollback side grouting back cover can be realized after tunneling in place, so that the construction efficiency is improved, and the influence on the existing tunnel and the surrounding environment is reduced. Finally, through the double-layer shield body and the sealing design, the invention can ensure the high efficiency and stability in the construction process, and particularly ensures the smooth construction under the complex geological and pressure conditions. The technical effect effectively improves the safety and reliability of construction, provides a high-efficiency and rollback solution for pipe jacking construction of the inclined shaft of the subway station, and can be used for constructing inclined shafts such as inclined escalators between a station hall layer and a station platform layer of the subway station.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of an originating state of an underground space inclined shaft rectangular push bench;

FIG. 2 is a schematic view showing a state of the underground space inclined shaft rectangular push bench when being pushed up to a target position;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a state diagram of grouting back cover construction;

FIG. 5 is an initial state diagram of the inner shield body continuing to roll back after grouting back cover construction is completed;

Fig. 6 is a front view of the drum cutterhead at the front ends of the inner shield body and the outer shield body;

FIG. 7 is an enlarged view of the drum cutting unit of FIG. 6;

FIG. 8 is a schematic view of a receiving sleeve receiving a roll-to-roll host machine;

FIG. 9 is a schematic view showing a state of the conventional push bench at the start;

fig. 10 is a schematic diagram showing a state of the conventional pipe-jacking machine in performing bottom-sealing grouting after inclined shaft tunneling.

Reference numerals illustrate:

Existing push bench 100, existing tunnel 200, peripheral space 300;

The concrete grouting device comprises a tunnel face 400, ideal back cover concrete slurry 500, actual back cover concrete slurry 600, theoretical concrete slurry liquid level 700 and actual back cover concrete slurry liquid level 800;

the pushing system 1 comprises a top supporting shoe 101, a pushing cylinder 102, a cylinder supporting surface 1021 and a top iron 103;

The roller type host 2 comprises an inner shield body 201, an outer shield body 202, a first supporting surface 2021, a second supporting surface 2022, a third supporting surface 2023, a roller type cutter 203, a sealing part 204, a grouting pipe 205 and a slag discharging pipe 206;

A roller cutting unit 2031, a roller 20311, picks 20312, and a hob 20313;

a roller support 2032;

rectangular pipe sections 3;

Traction system 4 including a retraction cylinder 401, a traction rope 402, a pulley 403, and a hoist 404;

A back cover concrete 5;

inclined shaft face 6;

a receiving sleeve 7;

an originating tunnel 8;

A receiving tunnel 9;

recycling structure 10;

a permanent structure 11.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by those skilled in the art without any inventive effort, are within the scope of the present invention based on the core idea of the present invention and the following embodiments.

These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. It should be noted that the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be construed as exemplary only and not limiting unless otherwise specifically stated.

It should be noted that, in the description of the present application, unless otherwise indicated, the meaning of "several" is greater than or equal to two, and the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", etc. indicate orientations or positional relationships merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. When the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.

Furthermore, the use of the terms first, second, and the like in the present application are not used for any order, quantity, or importance, but rather are used for distinguishing between different parts. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements.

It should also be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art. When a particular device is described as being located between a first device and a second device, there may or may not be an intervening device between the particular device and either the first device or the second device.

All terms used herein have the same meaning as understood by one of ordinary skill in the art to which the present application pertains, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.

As shown in fig. 1 to 3, the rectangular push bench for the inclined shaft in the underground space comprises a roller type main machine 2, wherein one side of the roller type main machine 2 is projected into a parallelogram and comprises an inner shield body 201 and an outer shield body 202 which are detachably connected. Namely, one side of the drum-type host machine 2 is projected into a parallelogram, the other side is projected into a rectangle, and the acute angle of the parallelogram is the included angle between the axis of the inclined shaft to be excavated and the axis of the originating tunnel 8. The inner shield body 201 and the outer shield body 202 are preferably connected by bolts, so that the assembly and the disassembly are facilitated, and a sealing component 204, such as a water-stopping rubber pad, a water-swelling pad, a composite structure thereof and the like, is arranged between the inner shield body 201 and the outer shield body 202.

As shown in fig. 6, the front ends of the inner shield 201 and the outer shield 202 are respectively provided with mutually independent drum cutterheads 203, the drum cutterhead 203 at the front end of the inner shield 201 and the drum cutterhead 203 at the front end of the outer shield 202 are mutually independent, the drum cutterhead 203 at the front end of the inner shield 201 is rectangular in whole, the drum cutterhead 203 at the front end of the outer shield 202 is annular in whole, and the two together form a full-section rectangular full-section cutting rolling excavation structure.

As shown in fig. 2 and fig. 3, the pushing directions of the pushing system 1 and the rectangular pipe section 3 at the rear end of the outer shield 202 are parallel to the axis of the outer shield 202, so that the inclined shaft face 6 excavated by each drum cutter 203 is ensured to be parallel to the bottom surface of the originating tunnel 8 in the originating and jacking processes. It should be noted that, in this embodiment, the rectangular pipe section 3 refers to a cross section of a rectangular pipe section for supporting an inclined shaft with a rectangular cross section, and one side view of the rectangular pipe section is not yet parallelogram. Meanwhile, the parallelogram appearing in the present invention means that the overall shape is approximately a parallelogram, and the overall contour includes two sides parallel to the left and right and two sides parallel to the top and bottom, but the existence of folding lines is allowed at the transition of the adjacent sides and at the local detail of the same side, so that it is not completely consistent with the parallelogram defined in the mathematical geometry.

As shown in fig. 3, the rear end of the inner shield 201 is provided with a grouting pipe 205 for grouting and exhausting gas when pushing in and retracting, a slag discharging pipe 206 for discharging slag when pushing in and filling back concrete 5 when retracting, and a traction system 4 for traction of the inner shield 201 when retracting.

On the basis of the above embodiment, as a preferred embodiment of the inclined shaft rectangular push bench in the underground space, as shown in fig. 1 to 4, the projection of one side of the pushing system 1 and the rectangular pipe section 3 and the projection of one side of the integral structure after the pushing system 1, the rectangular pipe section 3 and the outer shield 202 are sequentially contacted are all parallelograms.

Based on the above embodiment, as a preferred embodiment of the inclined shaft rectangular push bench in the underground space, the pushing system 1 includes a top support shoe 101, a pushing cylinder 102 and a top iron 103 connected in sequence, where the pushing directions of the plurality of pushing cylinders 102 between the top support shoe 101 and the top iron 103 are all parallel to the axis of the outer shield 202. The top supporting shoe 101 is used for being connected to the top of the originating tunnel 8, and each pushing cylinder 102 is arranged in a step mode, and synchronously pushes the top iron 103 or synchronously withdraws the top iron 103.

On the basis of the above embodiment, as a preferred embodiment of the inclined shaft rectangular push bench for underground space, as shown in fig. 1, the rear end face of the outer shield body 202 has the same shape as the rear end face of the rectangular pipe section 3 and includes a first support face 2021, a second support face 2022, a third support face 2023 and a fourth support face which are respectively adapted to the front end face of the rectangular pipe section 3 or the front end face of the top iron 103, the second support face and the fourth support face are parallel to the bottom face of the originating tunnel 8, and the first support face 2021 and the third support face 2023 are perpendicular to the pushing direction.

That is, the first bearing surface 2021, the second bearing surface 2022, the third bearing surface 2023 and the fourth bearing surface are rear end surfaces of the rear end of the outer shield body 202 in four directions, namely, front, back, left and right, respectively, wherein the first bearing surface 2021 and the third bearing surface 2023 are spaced apart from and parallel to each other, and the second bearing surface and the fourth bearing surface are spaced apart from and parallel to each other. Correspondingly, supporting surfaces matched with the rectangular pipe joint 3 and the top iron 103 are arranged on the rectangular pipe joint, so that pushing force transmission is more stable and reliable.

On the basis of the above embodiment, as a preferred embodiment of the inclined shaft rectangular push bench in the underground space, the rear end of the top iron 103 and the front end of the top supporting shoe 101 are provided with a plurality of cylinder supporting surfaces 1021, and each cylinder supporting surface 1021 is perpendicular to the pushing direction.

Based on the above embodiments, as a preferred embodiment of the inclined shaft rectangular push bench in the underground space, the drum cutter 203 includes a plurality of drum cutting units 2031, that is, the drum cutter 203 at the front end of the inner shield 201 and the drum cutter 203 at the front end of the outer shield 202 each include a plurality of independent drum cutting units 2031.

On the basis of the above embodiment, as a preferred embodiment of the inclined shaft rectangular push bench for underground space, the roller cutting unit 2031 comprises a built-in motor for driving the roller 20311 to rotate, and a plurality of hob 20313 and/or pick 20312 are arranged on the outer surface of the roller 20311. Preferably the hobs 20313 or picks 20312 on the drum 20311 are spaced apart in a spiral.

As a preferred embodiment of the construction method of the rectangular pipe pushing bench for the inclined shaft in the underground space, which is described in any one of the above embodiments, is adopted to perform blind shaft construction and inner shield 201 rollback construction.

On the basis of the above embodiment, as shown in fig. 1 to 3, in the preferred embodiment of the construction method of the inclined shaft rectangular pipe push bench for the underground space, when the blind shaft construction is performed, after the pushing system 1 is installed at the top of the initial tunnel 8 to push the drum-type host machine 2 to dig the rectangular pipe joint 3 installation space, the pushing system 1 is retracted, the rectangular pipe joint 3 is lowered at the rear end of the drum-type host machine 2, then the pushing system 1 pushes the drum-type host machine 2 through the rectangular pipe joint 3 to continuously dig a new rectangular pipe joint 3 installation space downwards, and then a new rectangular pipe joint is installed, so that the cycle is performed until the drum-type cutter 203 is dug to the bottom of the inclined shaft.

On the basis of the above embodiment, as a preferred embodiment of the construction method of the inclined shaft rectangular pipe jacking machine in the underground space, as shown in fig. 4 to 7, grouting back cover construction is performed while inner shield 201 is being carried out, the connection structure between inner shield 201 and outer shield 202 is removed, back cover concrete 5 is injected into inclined shaft face 6 through slag discharge pipe 206, air in inclined shaft face 6 is discharged through grouting pipe 205, meanwhile, inner shield 201 is slowly retracted along outer shield 202 by traction system 4 under the action of maintaining face pressure, and after grouting back cover construction is completed, inner shield 201 is completely separated from outer shield 202 by traction system 4 until retraction to originating tunnel 8.

As a preferred embodiment of the construction method of the underground space inclined shaft rectangular pipe-jacking machine, as shown in fig. 8, when the constructed receiving tunnel 21 is already present, the underground space inclined shaft rectangular pipe-jacking machine according to any one of the above embodiments is adopted for the penetrating construction, and the receiving sleeve 7 for receiving the drum-type host machine 2 is arranged in the receiving tunnel 21.

As a preferred embodiment of the construction method of the inclined shaft rectangular pipe pushing machine in the underground space, as shown in fig. 1 to 7, the inclined shaft rectangular pipe pushing machine in the underground space consists of a pushing system 1, a roller type host machine 2, a rear matched system and the like. In this embodiment, blind well construction is taken as an example, and the lower end of the inclined well has no receiving space.

The pushing system 1 consists of a top supporting shoe 101, a pushing oil cylinder 102 and a top iron 103, and is fixed at the position of an existing tunnel excavation inclined shaft. The pushing force provided by the pushing cylinder 102 acts on the top iron 103, and the top iron 103 pushes the main machine 4 to tunnel forwards.

The roller host 4 comprises an inner shield body 201 and an outer shield body 202, a plurality of sealing components 204 are arranged between the inner shield body 201 and the outer shield body 202, and a sealing state with pressure at the bottom of the well is maintained in the tunneling and rollback processes. The inner shield body 201 and the outer shield body 202 are detachably connected by bolts. The front ends of the inner shield body 201 and the outer shield body 202 are respectively provided with a roller cutter 203, a plurality of roller cutting units 2031 are arranged on the roller cutter 203, and the roller cutting units 2031 are supported by a roller support 2032. Wherein, each roller cutting unit 2031 is uniformly provided with a plurality of hob 801, and each roller cutting unit 20318 is provided with a built-in motor 802 and a hydraulic pipe, so that the roller cutting units can automatically rotate to effectively cut the rock mass of the face. In addition, a grouting pipe 205 and a slag discharging pipe 206 are arranged at the rear end of the inner shield body 201, when tunneling is performed, grouting 205 is injected with slurry to balance the pressure of the face, and the slag discharging pipe 206 discharges the cutter head to cut soil.

Tunneling stage of pipe pushing machine:

Firstly, one surface of a top supporting shoe 101 is fixed on the top wall of an inclined shaft excavation position of an initial tunnel 8 through a tunnel connecting structure, a pushing oil cylinder 102 and a top iron 103 are arranged on the other surface of the top supporting shoe, and the pushing oil cylinder 102 and the top iron 103 can move along the inclined shaft excavation direction to form an output end.

After the pipe jacking machine starts tunneling a stroke, the rectangular pipe joint 3 is lowered at the rear end of the roller type main machine 2, then the pushing system 1 acts on the rectangular pipe joint 3 to push the roller type main machine 2 to continuously tunnel forwards until the bottom of the inclined shaft. The outer shield body 202 is connected with the rectangular pipe joint 3, and keeps stable contact with an external soil layer in the jacking process, so that soil disturbance is effectively reduced.

Rollback stage of pipe pushing machine:

When tunneling is completed to the bottom of the inclined shaft, the jacking of the equipment is finished, and connecting bolts between the inner shield body 201 and the outer shield body 202 are removed, so that the inner shield body 201 and the outer shield body 202 are separated. As shown in fig. 5 and 6, the outer shield 202 and the rectangular tube pieces 3 are left downhole as part of a permanent structure, the central rectangular frame in fig. 6 is the recycling structure 10, and the peripheral annular frame is the permanent structure 11 buried underground. The drum cutter 203 at the front end of the inner shield 201 is recovered along with the inner shield 201.

When the inner shield body is recovered, firstly, a rollback cylinder 401 is arranged on the wall surface of the rectangular duct piece 3, bottom sealing concrete 5 is injected into the inclined shaft face 6 through the slag discharging pipe 206, the grouting pipe 12 is used for exhausting the inclined shaft face 6 at the stage, and the inner shield body 201 is slowly rolled back upwards by the rollback cylinder 401 under the action of keeping the pressure of the inclined shaft face 6. After grouting and back cover are completed, the rollback cylinder 401 is removed, then a pulley 403 is arranged on the top iron 103, and a traction rope 402 which passes through the pulley 403 and is connected with the inner shield 201 is wound up by a winding engine 404 in the originating tunnel 8, so that the inner shield 201 is continuously recovered. The design of the rollback function realizes the function of side-band pressure rollback side grouting back cover, and ensures that the pipe jacking recovery can be completed through the rollback of the inner shield body even under the condition of blind well or no receiving condition. The schematic diagram of the rollback step of the push bench is shown below.

As an alternative embodiment of the present invention, the hob 20313 on the roller cutting unit in the present invention may be replaced by the cutting pick 20312 during tunneling of a soft soil layer, and the hob 20313 and the cutting pick 20312 may be uniformly arranged on the roller cutting unit during tunneling under complex geological conditions. The invention takes the stratum geological working condition with the most severe application condition as an embodiment, and other various cutters can be installed under other inclined shaft tunneling working conditions.

As an alternative embodiment of the present invention, when a constructed receiving tunnel 9 or a subway station platform layer is already present at the lower part of the receiving end of the inclined shaft, the receiving sleeve 7 may be directly arranged from the lower part of the receiving tunnel 9 or the station platform layer to ensure the pressure balance of the receiving end, and the receiving sleeve is separated from the rectangular duct piece 3 after the drum-type host machine 2 is tunneled, enters the receiving sleeve, and is then recovered from the lower part.

The rectangular push bench for the underground space inclined shaft and the construction method thereof provided by the invention are particularly suitable for excavating the inclined staircase space between the connecting station hall layer and the platform layer in a subway station, and solve the problems that the prior push bench 100 occupies large starting space, needs to expand and excavate the prior tunnel 200, and cannot perform grouting and bottom sealing under the pressure condition after tunneling in place. The core invention comprises a drum-type cutterhead 203 with a rectangular full-section cutting and rolling excavation, a pushing system 1 with one side projected to be a parallelogram, a drum-type host machine 2, a rectangular pipe joint 3, a split inner shield body 201, an outer shield body 202, mutually independent drum cutting units 2031 arranged at the front end of the split inner shield body and the front end of the split outer shield body, and a grouting sealing bottom with pressure when the inner shield body 201 is retracted.

The invention aims to realize compact structure, adaptation to complex geological conditions and rollback function through innovative structural design and construction method, effectively solve the difficult problem in blind well construction and improve the construction efficiency, construction quality and safety of excavating an inclined escalator space in a subway station.

The core component comprises a pushing system 1, a drum-type host machine 2 with an inner-outer double-layer shield body structure, a traction system 4, a rear matched system and the like. The drum-type main machine 1 adopts a drum-type cutter 203, namely a rectangular full-section cutting rolling excavation device, and the drum 20311 is provided with picks 20312 and hobs 20313 which adapt to the geological conditions of soft soil and rock stratum, and high-efficiency excavation is realized through the rotation of the drum 20311. The pushing system 1 comprises a top supporting shoe 101, a pushing oil cylinder 102 and a top iron 103, wherein the pushing force of the pushing oil cylinder 102 is transmitted to the drum-type host machine 2 through the top iron 103 to push the drum-type host machine to tunnel forwards. The shield body is composed of an inner layer structure and an outer layer structure, the outer shield body 202 is connected with the rectangular pipe joint 3, and the shield body is reserved underground as a permanent structure after jacking is completed. The inner shield body 201 is separated from the outer shield body 202 through the sealing component 204, the sealing state of the bottom of the well is kept, key components such as the roller 20311 in the retreating area are recovered together with the inner shield body 201, and the retreating requirement is met. In addition, one side of the roller type host machine 2 adopts a parallelogram design, so that the construction space requirement is effectively reduced, and the roller type host machine is suitable for oblique starting and receiving.

In the underground space inclined shaft rectangular pipe jacking machine, as described above, the problems in inclined shaft pipe jacking construction are mainly solved through the innovative rectangular full-section cutting rolling excavation device and the detachable double-layer shield body design. The rectangular full-section cutting device can realize efficient excavation operation under complex geological conditions of soft soil and rock stratum alternation by arranging the cutting teeth and the hob. The inner and outer double-layer structure of the shield body ensures tightness and stability in the construction process, particularly in the rollback process, the sealing part between the inner and outer shield bodies ensures air tightness of the underground construction space, and the influence of water and soil pressure on tunneling is avoided. Compared with the prior art, the pipe jacking machine is more flexible in blind well construction by the design of the rollback function under pressure, the problem that grouting and bottom sealing cannot be performed under the pressure condition in the prior art is solved, and the feasibility and safety of integral construction are improved.

The present invention is not limited to the conventional technical means known to those skilled in the art.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (11)

1. A rectangular push bench for underground inclined shafts comprises a roller-type host machine and is characterized in that one side of the roller-type host machine is projected into a parallelogram and comprises an inner shield body and an outer shield body which are detachably connected, the front ends of the inner shield body and the outer shield body are respectively provided with mutually independent roller-type cutterheads, the pushing system at the rear end of the outer shield body and the pushing direction of a rectangular pipe joint are parallel to the axis of the outer shield body, the rear end of the inner shield body is provided with a grouting pipe for grouting and returning when jacking, a slag discharging pipe for filling back-up concrete when jacking and a traction system for traction of the inner shield body when returning, and inclined shaft palm faces dug by the roller-type cutterheads are parallel to the bottom surface of an originating tunnel in the processes of originating and jacking.

2. The underground space inclined shaft rectangular push bench of claim 1, wherein the projection of one side of the pushing system and the rectangular pipe joint and the projection of one side of the integral structure after the pushing system, the rectangular pipe joint and the outer shield body are contacted in sequence are parallelograms.

3. The underground space inclined shaft rectangular push bench of claim 1 or 2, wherein the pushing system comprises a top supporting shoe, pushing cylinders and a top iron which are sequentially connected, and pushing directions of a plurality of pushing cylinders between the top supporting shoe and the top iron are parallel to the axis of the outer shield body.

4. The underground space inclined shaft rectangular push bench of claim 3, wherein the rear end face of the outer shield body has the same shape as the rear end face of the rectangular pipe section and comprises a first supporting surface, a second supporting surface, a third supporting surface and a fourth supporting surface which are respectively matched with the front end face of the rectangular pipe section or the front end face of the top iron, the second supporting surface and the fourth supporting surface are parallel to the bottom face of the originating tunnel, and the first supporting surface and the third supporting surface are perpendicular to the pushing direction.

5. The underground space inclined shaft rectangular push bench of claim 4, wherein the rear end of the top iron and the front end of the top support shoe are provided with a plurality of oil cylinder supporting surfaces, and each oil cylinder supporting surface is perpendicular to the pushing direction.

6. The underground space inclined shaft rectangular push bench of any of claims 1, 2, 4 and 5, wherein the drum cutter comprises a plurality of drum cutting units.

7. The underground space inclined shaft rectangular push bench of claim 8, wherein the roller cutting unit comprises a built-in motor for driving the roller to rotate, and the outer surface of the roller is provided with a plurality of hob and/or pick teeth.

8. A construction method of an underground space inclined shaft rectangular pipe pushing bench is characterized in that the underground space inclined shaft rectangular pipe pushing bench is adopted to carry out blind shaft construction and inner shield body rollback construction according to any one of claims 1-7.

9. The construction method of the rectangular pipe jacking machine for the inclined shaft of the underground space according to claim 8, wherein when blind well construction is carried out, after the pushing system is installed at the top of the originating tunnel to push the drum-type main machine into and out of the rectangular pipe joint installation space, the pushing system is retracted, the rectangular pipe joint is lowered at the rear end of the drum-type main machine, then the pushing system pushes the drum-type main machine through the rectangular pipe joint to continuously tunnel downwards to form a new rectangular pipe joint installation space, and then the new rectangular pipe joint is installed, so that circulation is carried out until the drum-type cutterhead is excavated to the bottom of the inclined shaft.

10. The construction method of the rectangular push bench for the inclined shaft in the underground space according to claim 8 or 9, wherein grouting back cover construction is carried out while inner shield body rollback construction is carried out, a connecting structure between the inner shield body and the outer shield body is removed, back cover concrete is injected into the face of the inclined shaft through a slag discharging pipe, air in the face of the inclined shaft is discharged through a grouting pipe, meanwhile, the inner shield body is slowly rolled back along the outer shield body by utilizing a traction system under the action of pressure of the face of the inclined shaft, and after grouting back cover construction is completed, the inner shield body is completely separated from the outer shield body by utilizing the traction system until the inner shield body is rolled back to an originating tunnel.

11. A construction method of an underground space inclined shaft rectangular pipe pushing bench is characterized in that when a constructed receiving tunnel exists, the underground space inclined shaft rectangular pipe pushing bench is adopted to carry out penetrating construction, and a receiving sleeve for receiving a roller type host is arranged in the receiving tunnel.