CN217518676U

CN217518676U - Traction type pipe jacking construction backrest system

Info

Publication number: CN217518676U
Application number: CN202221929176.1U
Authority: CN
Inventors: 马云新; 赵洪岩; 吴昊; 游大江; 李森; 魏勇; 阚宝存; 倪平
Original assignee: BCEG Civil Engineering Co Ltd
Current assignee: BCEG Civil Engineering Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-09-30
Anticipated expiration: 2032-07-26

Abstract

The utility model discloses a traction type push pipe construction back system, including strengthening mechanism, the tractive hydro-cylinder, back mechanism and pressure control platform, strengthening mechanism corresponds and sets up in the back soil side that starts the tunnel portal week side shield section of jurisdiction, and will start a plurality of shield constructs the section of jurisdiction of tunnel portal week and link into a whole, tractive hydro-cylinder level sets up between strengthening mechanism and back mechanism, back mechanism corresponds and sets up in the shield tunnel one side of keeping away from the initial tunnel portal, it is close to one side wall of initial tunnel portal and links to each other as thrust cylinder's backstay face and thrust cylinder's stiff end butt, the pressure control platform passes through connecting line and links to each other with tractive hydro-cylinder and thrust cylinder, a pressure for balanced tractive hydro-cylinder and thrust cylinder. The utility model discloses an use the back system of tractive as the owner to realize the dispersion atress of tunnel segment, solved shield tunnel structure stress, warp, the too big problem of segment seam dislocation, effectively guaranteed shield tunnel structure's security and waterproof nature.

Description

Traction type pipe jacking construction backrest system

Technical Field

The utility model relates to a contact passageway push pipe construction technical field, concretely relates to traction type push pipe construction back system.

Background

Through development and utilization of urban underground spaces for many years, available resources of shallow underground spaces are less and less, particularly in urban central areas, the underground tunnel burial depth reaches 30 meters, and the trend that the underground tunnel buries deeper and deeper is obvious. The deep burying means that the construction is more difficult by the conventional mining method and more mechanized construction tunnels represented by the shield method are more and more faced with larger underground water pressure and more updated and more complicated geological conditions. In the existing GB50157-2013 subway design Specification, a contact channel is required to be arranged between two single-line interval tunnels in urban rail transit construction when the coherent length of the tunnels is more than 600m for fire evacuation. At present, branch tunnels such as an interconnection channel and the like are excavated by a mining method generally, particularly in a soft soil stratum, the periphery of the excavation needs to be reinforced within a certain range by grouting or freezing and other methods, the conventional freezing method has the problems of long construction period, high risk, high construction cost and the like, all parties basically keep the attitude of indiscriminate use of the quantity, and the development of mechanical construction equipment and construction method is a continuous pursuit of underground engineering workers all the time, and the mechanical construction is also a necessary way of improving the labor intensity of the construction workers and promoting the society.

When the contact channel is constructed by a mechanical method, a mechanical pipe jacking method is mostly adopted, the pipe jacking construction is necessary to exist in a rear backrest system, and the existing rear backrest system mostly adopts a pushing mode to act the thrust to the rear of the backrest. However, by adopting the method in the tunnel, the stress and deformation of the shield tunnel structure and the overlarge dislocation of the segment joints are easily caused, the safety of the shield tunnel structure is damaged, and the waterproof effect of the shield tunnel is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a traction type push pipe construction back system to solve in the background art technical problem.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

the utility model provides a tractive formula push pipe construction back system, includes strengthening mechanism, tractive hydro-cylinder, back mechanism and pressure control platform, strengthening mechanism corresponds and sets up in the soil backing side of originating entrance to a cave week side shield section of jurisdiction, and strengthening mechanism will originate a plurality of shield segments of entrance to a cave week side and link into a whole, and strengthening mechanism is including burying the reinforcing steel board at shield segment soil backing side underground, reinforcing steel board buries one side equidistant welding in shield segment concrete and has a plurality of anchor bars, and the anchor bar is pour in the concrete of shield segment, and the shield segment is located the part of originating entrance to a cave within range and does not set up reinforcing steel board, and the reinforcing steel board of a plurality of shields segments of the entrance to a cave outside of a cave adopts the through seam to assemble to form a whole through a plurality of longitudinal connecting rods of welded fastening and radial connecting rod, the tractive hydro-cylinder is provided with a plurality of roots, and a plurality of roots of sensation hydro-cylinder use the central axis of the origin entrance to be the origin to be laid at the same interval as the center of a root of a cave of a root and establish at the origin at the reinforcement of a root and establish at the origin entrance to the origin at the entrance to be laid at the reinforcement of a root and fix and establish at the origin at the origin of a root and a root of a root and a root of a root and not set up the origin a root of a root and not set up the origin the root and not set up the root of a root and not set up the root of a root and not set up the reinforcing steel board of a root and not set up the reinforcing steel board of a root and not set In the mechanism, the traction oil cylinder is a double-head hydraulic oil cylinder and comprises a cylinder body at the middle part and piston rods at two ends, the traction oil cylinder is horizontally arranged, two ends of the traction oil cylinder are fixedly arranged on the reinforcing mechanism and the backrest mechanism respectively through traction supports, the backrest mechanism is correspondingly arranged on one side of the shield tunnel far away from the initial opening, one side wall surface of the backrest mechanism close to the initial opening is connected with the fixed end of the propulsion oil cylinder in an abutting mode as a back-supporting surface of the propulsion oil cylinder, and the pressure control console is connected with the traction oil cylinder and the propulsion oil cylinder through connecting pipelines and used for balancing the pressure of the traction oil cylinder and the propulsion oil cylinder.

Preferably, the backrest mechanism comprises a steel backrest, a pushing oil cylinder and a supporting shoe, one side of the steel backrest is connected with the pulling oil cylinder through a pulling support fixed by welding, the other side of the steel backrest is connected with the supporting shoe through a plurality of pushing oil cylinders, one side of the supporting shoe, which is far away from the pushing oil cylinder, is set to be an arc surface matched with a shield segment at a corresponding position, and the pushing oil cylinder is connected with the pressure control console through a connecting pipeline for compensating a pressure difference value between the pulling oil cylinder and the pushing oil cylinder.

Preferably, the longitudinal connecting rod is parallel to the central axis direction of the shield tunnel, the rod body of the longitudinal connecting rod is attached to the reinforcing steel plate and traverses all vertical joints of the reinforcing steel plate, the radial connecting rod is perpendicular to the central axis direction of the shield tunnel, the rod body of the radial connecting rod is arc-shaped and attached to the reinforcing steel plate, and the rod body traverses all horizontal joints of the reinforcing steel plate.

Preferably, the traction support includes drawknot sleeve, traction rod and drawknot support, drawknot sleeve opening one end is fixed to be set up on strengthening mechanism or back mechanism, and equidistant being fixed with a plurality of drawknot floor between its barrel week side and strengthening mechanism or back mechanism, and the through-hole has been seted up at its bobbin base middle part, and wears to be equipped with the traction rod in the through-hole, the one end welded fastening that the traction rod extends to the drawknot sleeve inboard has the drawrod head of pie, and the size of drawrod head is greater than the size of drawknot sleeve bobbin base through-hole, and the one end welded fastening that the drawrod kept away from the drawknot sleeve has the drawknot support, the drawknot support is the U type, and its U type inslot interpolation is equipped with the piston rod head of traction cylinder, and its U type groove wall is located the top bottom both ends of piston rod head, and its U type groove wall is connected with the piston rod head through the round pin axle.

Preferably, four drawing oil cylinders are arranged, four drawing supports corresponding to one ends of the four drawing oil cylinders close to the starting hole are respectively arranged on four corner points of a rectangle on the outer side of the starting hole, and the center point of the rectangle is located on the central axis of the starting hole.

Preferably, four traction supports close to one side of the starting hole are vertically arranged into a group, a support upright post is erected between each group of traction supports, the support upright posts are vertically arranged, and the end parts of rod bodies of the support upright posts are connected with a connecting seat welded and fixed on the drawknot sleeve through pin shafts.

Preferably, two traction oil cylinders arranged above are provided with supporting inclined rods, one ends of the supporting inclined rods are connected with the hinged seats on the cylinder body through pin shafts, and the other ends of the supporting inclined rods are connected with the hinged seats on the supporting upright posts or the backrest mechanism through pin shafts.

Preferably, nine jacking oil cylinders are arranged on the steel backrest in a rectangular array, and the central axis of the jacking oil cylinder positioned in the center of the rectangular array is superposed with the central axis of the starting hole.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has the advantages of novel and reasonable design, replaced the backrest system who singly relies on the top pushing mode to act on thrust to the backrest rear in traditional mode through the backrest system who gives first place to the tractive to further set up the compensation mechanism that the top was pushed away for assisting, realized the organic combination that tractive and top pushed away, tunnel segment dispersion atress has solved shield tunnel structure stress, deformation, the too big problem of section of jurisdiction seam mistake platform, has effectively guaranteed shield tunnel structure's security and waterproof nature.

Drawings

The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are given by way of illustration only and not by way of limitation, wherein:

FIG. 1 is a schematic structural view of a traction type pipe jacking construction backrest system in a shield tunnel along the cross section of the shield tunnel;

FIG. 2 is a schematic structural view of a traction type pipe jacking construction backrest system according to the present invention;

FIG. 3 is a schematic structural view of a reinforcing mechanism of a traction type pipe jacking construction backrest system in a shield tunnel along a longitudinal section of the shield tunnel;

FIG. 4 is a schematic structural view of a reinforcing steel plate and an anchoring steel bar of the traction type pipe jacking construction backrest system according to the present invention;

FIG. 5 is a schematic structural diagram of a first step of a method for using a traction type pipe jacking construction backrest system according to the present invention;

FIG. 6 is a schematic structural diagram of a second step of a method for using a traction type pipe jacking construction backrest system according to the present invention;

fig. 7 is a schematic structural diagram of a third step of a using method of the traction type pipe jacking construction backrest system according to the present invention.

Reference numerals: 1-shield tunnel, 2-shield segment, 3-initial opening, 4-reinforcing mechanism, 401-reinforcing steel plate, 402-anchoring steel bar, 403-longitudinal connecting rod, 404-radial connecting rod, 5-pulling support, 501-pulling sleeve, 502-pulling ribbed plate, 503-pulling rod head, 504-pulling rod, 505-pulling support, 506-connecting seat, 507-supporting upright post, 6-pin shaft, 7-pulling oil cylinder, 701-cylinder body, 702-piston rod, 8-supporting diagonal rod, 9-hinging seat, 10-backrest mechanism, 1001-steel backrest, 1002-pushing oil cylinder, 1003-supporting shoe, 11-oil cylinder support, 12-pushing oil cylinder, 13-connecting pipeline, 14-pressure control console, 15-pipe pushing machine, 16-track, 17-trolley and 18-pipe joint.

Detailed Description

Hereinafter, an embodiment of a traction type pipe jacking construction backrest system according to the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.

In the description of the present invention, it should be noted that the terms "top", "bottom", "upper", "lower", "inner", "outer", "horizontal", "longitudinal", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof. It should be noted that for the sake of clarity in showing the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.

The principles and features of the present invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to explain the present invention and not to limit the scope of the invention. The preferred embodiments of the present invention will be described in further detail below with reference to fig. 1-7:

as shown in fig. 1-2, the preferred traction type pipe jacking construction backrest system of the present invention comprises a reinforcing mechanism 4, a traction cylinder 7, a backrest mechanism 10 and a pressure control console 14, as shown in fig. 3-4, the reinforcing mechanism 4 is correspondingly arranged on the soil backing side of a shield segment 2 around a starting opening 3, and the reinforcing mechanism 4 connects a plurality of shield segments 2 around the starting opening 3 into a whole, the reinforcing mechanism 4 comprises a reinforcing steel plate 401 embedded in the soil backing side of the shield segment 2 and having a thickness of 3cm, a plurality of anchoring steel bars 402 having a diameter of 22mm are welded at equal intervals on one side of the reinforcing steel plate 401 embedded in the concrete of the shield segment 2, and the anchoring steel bars 402 are poured in the concrete of the shield segment 2 to prevent the shield segment 2 from coming out of the shield segment after the reinforcing steel plate 401 is pulled, the reinforcing steel plate 401 is not arranged on the part of the shield segment 2 within the range of the starting opening 3, reinforcing steel plates 401 of a plurality of shield segments 2 outside an originating opening 3 are assembled by means of through seams and form a whole by means of a plurality of longitudinal connecting rods 403 and radial connecting rods 404 which are fixedly welded, the longitudinal connecting rods 403 are arranged in parallel to the central axis direction of the shield tunnel 1, rod bodies of the longitudinal connecting rods 403 are attached to the reinforcing steel plates 401 and cross all vertical abutted seams of the reinforcing steel plates 401, the radial connecting rods 404 are arranged in a direction perpendicular to the central axis direction of the shield tunnel 1, are arc-shaped and are attached to the reinforcing steel plates 401, and the rod bodies of the radial connecting rods cross all horizontal abutted seams of the reinforcing steel plates 401;

four drawing oil cylinders 7 are arranged, the drawing oil cylinders 7 adopt double-head hydraulic oil cylinders, the four drawing oil cylinders 7 are arranged on the reinforcing mechanism 4 on the peripheral side of the starting opening 3 at equal intervals by taking the central axis of the starting opening 3 as the center, the drawing oil cylinders 7 are horizontally arranged, two ends of the drawing oil cylinders 7 are fixedly arranged on the reinforcing mechanism 4 and the backrest mechanism 10 through drawing supports 5 respectively, the four drawing supports 5 corresponding to one ends of the four drawing oil cylinders 7 close to the starting opening 3 are arranged on four corner points of a rectangle on the outer side of the starting opening 3 respectively, and the central point of the rectangle is positioned on the central axis of the starting opening 3;

the backrest mechanism 10 is correspondingly arranged on one side of the shield tunnel 1 far away from the starting tunnel portal 3, the wall surface of one side of the backrest mechanism, close to the starting tunnel portal 3, is used as a back-support surface of the propulsion oil cylinder 12 and is connected with the fixed end of the propulsion oil cylinder 12 in an abutting mode, the backrest mechanism 10 comprises a steel backrest 1001, a jacking oil cylinder 1002 and a supporting shoe 1003, the steel backrest 1001 is of a box-shaped structure and is made of 3cm steel plates, I-shaped steel with the model number of 250 is placed in the box-shaped structure at equal intervals to serve as reinforcing rib plates, one side of the steel backrest 1001 is connected with the traction oil cylinder 7 through a traction support 5 fixed in a welding mode, the other side of the steel backrest is connected with the supporting shoe 1003 through nine jacking oil cylinders 1002, one side of the supporting shoe, far away from the jacking oil cylinder 1002, is arranged into an arc surface matched with the shield segment 2 at the corresponding position, the nine jacking oil cylinders 1002 are arranged on the steel backrest 1001 according to a rectangular array, and the central axis of the jacking oil cylinder 1002 at the central position of the rectangular array coincides with the central axis of the starting tunnel portal 3, the pushing oil cylinder 1002 is connected with a pressure control platform 14 through a connecting pipeline 13 and is used for compensating a pressure difference value between the pulling oil cylinder 7 and the pushing oil cylinder 12;

the traction support 5 comprises a traction sleeve 501, a traction rod 504, a traction support 505 and a support upright 507, wherein one end of an opening of the traction sleeve 501 is fixedly arranged on a reinforced steel plate 401 or a steel backrest 1001, six traction rib plates 502 are fixed between the circumferential side of a cylinder body and the reinforced steel plate 401 or the steel backrest 1001 at equal intervals, a through hole is formed in the middle of the cylinder bottom, the traction rod 504 penetrates through the through hole, a cake-shaped traction rod head 503 is fixedly welded at one end of the traction rod 504 extending to the inner side of the traction sleeve 501, the size of the traction rod head 503 is larger than that of the through hole at the cylinder bottom of the traction sleeve 501, the traction support 505 is fixedly welded at one end of the traction rod 504 far away from the traction sleeve 501, the traction support 505 is U-shaped, a piston rod head 702 of a traction cylinder 7 is inserted in a U-shaped groove, the walls of the U-shaped groove are positioned at two ends of the top bottom of the piston rod head 702, and the U-shaped groove walls are connected with the piston rod head 702 through a pin 6, four traction supports 5 close to one side of the starting hole 3 are arranged in a group from top to bottom, a support upright 507 is erected between each group of traction supports 5, the support upright 507 is vertically arranged, the end part of a rod body of each support is connected with a connecting seat 506 on the drawknot sleeve 501 through a pin shaft 6, in order to improve the stability of the traction oil cylinders 7, two traction oil cylinders 7 arranged above the support upright 507 are provided with support inclined rods 8, one ends of the support inclined rods 8 are connected with a hinge seat 9 on the cylinder body 701 through pin shafts 6, and the other ends of the support inclined rods 8 are connected with the hinge seats 9 on the support upright 507 or the steel backrest 1001 through pin shafts 6;

the pressure control table 14 is internally provided with a PLC control computer and is provided with a display screen, the PLC control computer is respectively connected with each drawing oil cylinder 7, each pushing oil cylinder 1002 and each pushing oil cylinder 12 through a connecting pipeline 13, the display screen respectively displays the oil pressure, the oil temperature and the pulling force or the pushing force of each oil cylinder, the PLC control computer can balance the pressure of each pushing oil cylinder 12 and the pressure of each drawing oil cylinder 7, and if the pressure of each drawing oil cylinder 7 is not enough to balance the pressure of each pushing oil cylinder 12, the PLC control computer analyzes the pressure and increases the pressure of each pushing oil cylinder 1002 for compensation.

As shown in fig. 5-7, the utility model also provides an application method of above-mentioned traction type pipe jacking construction backrest system, including the following steps: firstly, a track 16 is laid in a shield tunnel 1, a pipe jacking machine 15 is installed in place through a trolley 17 (the trolley 17 is provided with a hydraulic system, a muck improvement system, a compressed air system, a transformer, a cooling water system, a hoisting system, a grease injection system, a grouting system, an operation chamber, a bentonite system and a pressure control table 14 required by pipe jacking construction), shield segments 2 on the periphery of a starting tunnel portal 3 are reinforced into a whole through a reinforcing mechanism 4, and a traction oil cylinder 7, a backrest mechanism 10, an oil cylinder support 11 and a propulsion oil cylinder 12 are installed;

step two, placing a first pipe joint 18 at the front end of a propulsion oil cylinder 12 in a contracted state, starting a traction oil cylinder 7 while starting the propulsion oil cylinder 12 to jack the pipe joint 18, adjusting the pressure of the traction oil cylinder 7 through a pressure control table 14 to keep the pressure balance of the traction oil cylinder 7 and the propulsion oil cylinder 12, contracting the propulsion oil cylinder 12 and placing a second pipe joint 18 after the propulsion stroke of the propulsion oil cylinder 12 reaches the length of one pipe joint 18, jacking the second pipe joint 18 and balancing the pressure of the traction oil cylinder 7 and the propulsion oil cylinder 12, and repeating the operations of the propulsion oil cylinder 18, the contraction propulsion oil cylinder 12 and the placement of the next pipe joint 18 until the front end of a pipe jacking machine 15 advances to the position of the soil back surface of a shield segment 2 at the position of a starting tunnel entrance 3;

thirdly, the pipe jacking machine 15 cuts the concrete of the shield segment 2 and enters the soil body (in order to prevent the normal operation of the pipe jacking machine 15 from being influenced by the internal reinforcing bars of the shield segment 2, the reinforcing bars in the shield segment 2 at the starting opening 3 are replaced by glass fiber reinforcing bars), the operations of pushing the pipe joints 18, contracting the pushing oil cylinder 12 and placing the next pipe joint 18 are continuously repeated, when the pressure of the pulling oil cylinder 7 is not enough to balance the pressure of the pushing oil cylinder 12, the pushing oil cylinder 1002 is started through the pressure control console 14 to push the supporting shoe 1003 into the shield segment 2 on one side in the opposite direction of the tunneling direction and be attached to the pipe jacking cylinder 2, and the pressure of the pushing oil cylinder 1002 is adjusted to keep the sum of the pressures of the pulling oil cylinder 7 and the pushing oil cylinder 1002 balanced with the pressure of the pushing oil cylinder 12 until the construction of the communication channel is completed.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a back system is under construction to tractive formula push pipe which characterized in that: comprises a reinforcing mechanism (4), a traction oil cylinder (7), a backrest mechanism (10) and a pressure control platform (14), wherein the reinforcing mechanism (4) is correspondingly arranged on the soil-backed side of the shield segment (2) on the peripheral side of the starting tunnel portal (3), the plurality of shield segments (2) on the peripheral side of the starting tunnel portal (3) are connected into a whole by the reinforcing mechanism (4), the reinforcing mechanism (4) comprises a reinforcing steel plate (401) buried in the soil-backed side of the shield segment (2), a plurality of anchoring steel bars (402) are welded on one side of the reinforcing steel plate (401) buried in the concrete of the shield segment (2) at equal intervals, the anchoring steel bars (402) are poured in the concrete of the shield segment (2), the reinforcing steel plate (401) is not arranged on the part of the shield segment (2) in the range of the starting tunnel portal (3), and the reinforcing steel plates (401) of the plurality of shield segments (2) outside the starting tunnel portal (3) adopt through seams, the device is characterized in that the device is integrated with a plurality of longitudinal connecting rods (403) and radial connecting rods (404) which are fixed by welding, a plurality of drawing oil cylinders (7) are arranged on a reinforcing mechanism (4) on the peripheral side of a starting hole (3) at equal intervals by taking the central axis of the starting hole (3) as the center, each drawing oil cylinder (7) is a double-head hydraulic oil cylinder and comprises a cylinder body (701) in the middle and piston rods (702) at two ends, each drawing oil cylinder (7) is horizontally arranged, the piston rods (702) at two ends are respectively and fixedly arranged on the reinforcing mechanism (4) and a backrest mechanism (10) through a drawing support (5), the backrest mechanism (10) is correspondingly arranged on one side of the shield tunnel (1) far away from the starting hole (3), and one side wall surface of the backrest mechanism close to the starting hole (3) is used as a back-supporting surface of a propulsion oil cylinder (12) and is abutted against the fixed end of the propulsion oil cylinder (12), the pressure control console (14) is connected with the pulling oil cylinder (7) and the propelling oil cylinder (12) through a connecting pipeline (13) and is used for balancing the pressure of the pulling oil cylinder (7) and the propelling oil cylinder (12).

2. The traction type pipe jacking construction backrest system according to claim 1, wherein: the device is characterized in that the backrest mechanism (10) comprises a steel backrest (1001), a pushing oil cylinder (1002) and a supporting shoe (1003), one side of the steel backrest (1001) is connected with the pulling oil cylinder (7) through a pulling support (5) fixed by welding, the other side of the steel backrest is connected with the supporting shoe (1003) through a plurality of pushing oil cylinders (1002), one side, far away from the pushing oil cylinder (1002), of the supporting shoe (1003) is set to be a shield segment (2) matched arc surface corresponding to the position, and the pushing oil cylinder (1002) is connected with a pressure control console (14) through a connecting pipeline (13) and used for compensating a pressure difference value between the pulling oil cylinder (7) and a propelling oil cylinder (12).

3. The traction type pipe jacking construction backrest system according to claim 1, wherein: longitudinal connecting rod (403) are on a parallel with the central axis direction setting of shield tunnel (1), and its body of rod pastes and establishes on consolidating steel sheet (401) and crosses all vertical patchings of consolidating steel sheet (401), the central axis direction setting of radial connecting rod (404) perpendicular to shield tunnel (1), and its body of rod is the arc and pastes and establish on consolidating steel sheet (401), and its body of rod crosses all horizontal patchings of consolidating steel sheet (401).

4. The traction type pipe jacking construction backrest system according to claim 1, wherein: the traction support (5) comprises a traction sleeve (501), a traction rod (504) and a traction support (505), one end of an opening of the traction sleeve (501) is fixedly arranged on the reinforcing mechanism (4) or the backrest mechanism (10), a plurality of traction ribbed plates (502) are fixedly arranged between the circumferential side of a cylinder body and the reinforcing mechanism (4) or the backrest mechanism (10) at equal intervals, a through hole is formed in the middle of the cylinder bottom of the traction sleeve, the traction rod (504) penetrates through the through hole, a cake-shaped traction rod head (503) is fixedly welded at one end, extending to the inner side of the traction sleeve (501), of the traction rod (504), the size of the traction rod head (503) is larger than that of the through hole in the cylinder bottom of the traction sleeve (501), the traction support (505) is fixedly welded at one end, far away from the traction sleeve (501), of the traction support (505) is U-shaped, a piston rod (702) of the traction oil cylinder (7) is inserted in a U-shaped groove, the walls of the U-shaped groove are positioned at the top and bottom ends of the rod head of the piston rod (702), and the walls of the U-shaped groove are connected with the rod head of the piston rod (702) through a pin shaft (6).

5. The traction type pipe jacking construction backrest system according to claim 4, wherein: four drawing oil cylinders (7) are arranged, four drawing supports (5) corresponding to one ends of the four drawing oil cylinders (7) close to the starting hole (3) are respectively arranged on four corner points of a rectangle on the outer side of the starting hole (3), and the center point of the rectangle is located on the central axis of the starting hole (3).

6. The traction type pipe jacking construction backrest system according to claim 5, wherein: four traction supports (5) close to one side of the starting hole (3) are vertically arranged into a group, a support upright post (507) is erected between each group of traction supports (5), the support upright post (507) is vertically arranged, and the end part of a rod body of the support upright post is connected with a connecting seat (506) on the drawknot sleeve (501) through a pin shaft (6).

7. The traction type pipe jacking construction backrest system according to claim 5, wherein: two traction oil cylinders (7) arranged above are provided with supporting inclined rods (8), one ends of the supporting inclined rods (8) are connected with hinged seats (9) on the cylinder body (701) through pin shafts (6), and the other ends of the supporting inclined rods (8) are connected with hinged seats (9) on supporting upright columns (507) or backrest mechanisms (10) through pin shafts (6).

8. The traction type pipe jacking construction backrest system according to claim 2, wherein: nine jacking oil cylinders (1002) are arranged, the nine jacking oil cylinders (1002) are arranged on the steel backrest (1001) according to a rectangular array, and the central axis of the jacking oil cylinder (1002) positioned at the central position of the rectangular array is superposed with the central axis of the starting hole (3).