CN115199813A - Construction process for starting end of oblique jacking pipe - Google Patents
Construction process for starting end of oblique jacking pipe Download PDFInfo
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- CN115199813A CN115199813A CN202210851723.7A CN202210851723A CN115199813A CN 115199813 A CN115199813 A CN 115199813A CN 202210851723 A CN202210851723 A CN 202210851723A CN 115199813 A CN115199813 A CN 115199813A
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- pipe
- jacking
- extension wall
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- well
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction process for an initial end of an oblique jacking pipe, wherein in the construction process, an extension wall is constructed, and a back rest temporary buttress and a back rest profile steel reaction frame behind an initial well inlet are constructed; then a triangular steel ring is arranged in a range enclosed by the connecting line of the extension wall and the other end of the starting well inlet and the starting well inlet; finally, installing a pipe jacking machine, and backfilling the triangular steel ring area; and secondary grouting plugging is performed on the extension wall and the end wall joint ring beam. The construction process of the starting end of the oblique jacking pipe has good adaptability, so that the construction process of the pipe jacking channel oblique crossing can be used for pipe jacking channel construction under different oblique crossing conditions, and the requirements of building functions and peripheral condition limitations are met to the maximum extent. And the duct piece does not need to be cut in the construction process, the structural damage of the structure is avoided, and the stress, the water resistance and the structural safety of the structure are not influenced. Avoid using the casing to carry out the atress as permanent structure, do not have the casing to be connected with prefabricated section of jurisdiction, avoid leaking.
Description
Technical Field
The invention relates to a pipe jacking diagonal construction process, in particular to a construction process for an initial end of a diagonal pipe jacking.
Background
At present, most of the existing subway cross-street channel pipe-jacking construction processes are pipe-jacking construction processes in which an originating end wall and a receiving end wall are perpendicular to the axis direction of a channel, and few pipe-jacking construction processes in which the originating end wall and the receiving end wall of a pipe are oblique to the axis direction of the channel are available. However, with the development of subway construction and subway technology in China, the situation that the axial directions of the head wall at the starting end of the jacking pipe and the head wall at the receiving end of the jacking pipe are obliquely crossed with the axial direction of the channel of the jacking pipe is more and more likely to occur. The existing pipe jacking process is that the initial end wall and the receiving end wall are perpendicular to the axial direction of a channel, and when the functional requirements of building channels, building planning requirements, the limitation of existing surrounding building structures and underground pipelines and the requirement of making oblique pipe jacking channels are met, the existing orthogonal pipe jacking process has limitations.
In the prior art, a method for processing an oblique crossing receiving end by cutting segments is adopted, but the method for cutting segments can only aim at the condition that the partial small range of the last segment of segment invades an end wall under the condition of a small oblique crossing angle. And the local cutting of the concrete precast jacking pipe piece can damage the structural structure, thus being not beneficial to the stress, water resistance and structural safety of the structure.
The scheme of the waste pipe jacking machine shell for cutting the pipe jacking shell is not economical, the connection part of the shell and the prefabricated pipe piece is a weak part, water is easy to leak, the difficult period of connection construction of the pipe jacking machine shell and the end wall is large, water is easy to leak in the later period, and particularly in a corrosive environment, the durability of the pipe jacking machine shell as a permanent structure has a problem.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a construction process for the initial end of the oblique-crossing pipe-jacking of the pipe-jacking by arranging an extension wall and a triangular steel ring at the port of the oblique-crossing pipe-jacking initial well, extending the oblique-crossing initial well into a state vertical to a pipe-jacking channel and then jacking the pipe.
The technical scheme adopted by the invention for solving the technical problem is as follows: an initial end construction process of an oblique jacking pipe comprises the following steps:
s1: constructing a pipe jacking initial well and a pipe jacking receiving well, and reinforcing construction at the entrance of the initial well;
s2: constructing an extension wall, and constructing a back rest temporary buttress and a back rest section steel reaction frame at the entrance of the starting well;
s3: mounting a triangular steel ring in a range enclosed by a connecting line of the extension wall and the other end of the starting well inlet and the starting well inlet, and embedding the inclined end of the triangular steel ring into the tunnel door and welding and fixing the inclined end of the triangular steel ring with the tunnel door embedded steel plate;
s4: installing a pipe jacking machine, breaking a tunnel portal guard post while installing the pipe jacking machine, and backfilling a triangular steel ring area;
s5: normal pipe jacking construction is carried out on the pipe jacking machine, and after the pipe jacking construction is finished, the pipe jacking machine head is lifted out;
s6: dismantling the temporary backrest buttress and the backrest profile steel reaction frame after the entrance of the starting well;
s7: and performing secondary grouting plugging on the extension wall and the end wall joint ring beam.
As an improvement of the technical scheme, the starting well is a special-shaped well, and the joint of the special-shaped starting well and the top pipe channel is obliquely arranged relative to the top pipe channel.
As a further improvement of the technical scheme, the extension wall is constructed with a plurality of extension walls, and the plurality of extension walls are arranged at one end, far away from the reaction frame, of the inclined starting well inlet; and the extension wall extends to the position where the connecting line of the other end of the starting well inlet is vertical to the pipe jacking channel.
As a further improvement of the technical scheme, the extension wall comprises a main extension wall parallel to the edge of the originating well and an auxiliary extension wall arranged on the main extension wall.
As a further improvement of the above technical solution, the auxiliary extension wall includes an auxiliary extension wall extending from the main extension wall toward the sidewall of the originating well and an auxiliary extension wall extending from the main extension wall toward the other end of the entrance of the originating well.
As a further improvement of the technical scheme, the grouting positions during the secondary grouting comprise a position between an entrance of the starting well and the top pipe sheet, a position between the main extension wall and the entrance of the starting well and a position between the main extension wall and the auxiliary extension wall.
As a further improvement of the technical scheme, when backfilling is carried out in a range surrounded by a connecting line of the extension wall and the other end of the starting well inlet and the starting well inlet, waterproof paint is coated firstly, and then backfilling is carried out by adopting C20 plain concrete.
As a further improvement of the technical scheme, a steel bar net piece is further paved at the top of the triangular steel ring.
As a further improvement of the technical scheme, the triangular steel ring is provided with a preformed hole, and the preformed hole is used for reinforcing soil body cement injection slurry in the steel ring.
As a further improvement of the technical scheme, when the push bench carries out push bench construction, the front three ring pipe pieces of the push bench in the starting inclined shaft range are longitudinally connected and reinforced.
The beneficial effects are that: the construction process of the initial end of the oblique jacking pipe has good adaptability, so that the construction process of the oblique jacking pipe channel can be used for the construction of the jacking pipe channel under different oblique crossing conditions, and the requirements of building functions and peripheral condition limitation are met to the maximum extent. And in the construction process, the duct piece does not need to be cut, the structural damage of the structure can be avoided, and the stress, the water resistance and the structural safety of the structure are not influenced. The machine shell is prevented from being used as a permanent structure to bear force, the connection of the machine shell and the prefabricated pipe piece is avoided, and water leakage is avoided.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a process flow diagram of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The conception, the specific structure and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments and the attached drawings, so as to fully understand the objects, the features and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The technical characteristics in the invention can be combined interactively on the premise of not conflicting with each other.
Referring to fig. 1 and 2, the construction process for the initiating end of the oblique jacking pipe comprises the following steps:
s1: constructing a pipe jacking initial well and a pipe jacking receiving well, and reinforcing construction at the entrance of the initial well;
the pipe jacking starting well and the pipe jacking receiving well are respectively positioned at two ends of the pipe jacking channel, the joint of the pipe jacking starting well and the pipe jacking channel is an inlet of the starting well, the pipe jacking machine jacks pipe pieces into the pipe jacking channel from the inlet of the starting well, the pipe jacking machine jacks the pipe jacking pipe pieces into an outlet of the receiving well of the pipe jacking receiving well, and the pipe jacking machine is hoisted out of the pipe jacking receiving well.
Different from the conventional starting well which is horizontally arranged with the axis of the pipe jacking channel, the starting well is a special-shaped well, and the joint of the special-shaped starting well and the pipe jacking channel is obliquely arranged relative to the pipe jacking channel.
As an implementation mode of the scheme, the special-shaped starting well is composed of a square space perpendicular to the axis of the pipe jacking channel and a special-shaped space formed by connecting the square space and the pipe jacking channel. When pipe jacking is performed in the space, the installation of the pipe jacking machine needs to be performed firstly, and in order to avoid the position deviation of the pipe jacking machine when the pipe jacking machine enters the pipe jacking passage through the starting well inlet, the reinforcing needs to be performed at the starting well inlet firstly. During reinforcement, a stirring pile can be arranged at the entrance of the starting well, and then steel rings are embedded at two ends of the entrance of the starting well in advance and special-shaped columns are arranged.
S2: constructing an extension wall, and constructing a back rest temporary buttress and a back rest section steel reaction frame at the entrance of the starting well;
the extension wall is constructed with a plurality of extension walls, and the plurality of extension walls are arranged at one end, far away from the reaction frame, of the inclined starting well inlet; and the extension wall extends to the position where the connecting line of the other end of the starting well inlet is vertical to the pipe jacking channel.
The extension wall includes a main extension wall parallel to an edge of the originating well and an auxiliary extension wall disposed on the main extension wall. The auxiliary extension wall includes an auxiliary extension wall extending from the main extension wall toward the sidewall of the originating well and an auxiliary extension wall extending from the main extension wall toward the other end of the entrance of the originating well.
As an implementation mode of the scheme, the extension main extension wall is a first side wall, and the first side wall is parallel to the edge of the top pipe channel and is connected with a special-shaped column at an entrance of the starting well. Therefore, the side walls form the extension of the pipe-jacking channel, so that the joint of the pipe-jacking channel and the originating well is changed into the connecting line of the end part of the first side wall and the other end of the pipe-jacking channel, the length of the first side wall is adjusted, the connecting line of the end part of the extension section of the first side wall and the other end of the original originating well is perpendicular to the axis of the pipe-jacking channel, and a new non-oblique originating well inlet is formed in the originating well.
The extension wall further comprises a second side wall and a third side wall, and the second side wall and the third side wall can be connected between the first side wall and the second side wall of the push pipe originating well to support the first side wall and ensure the stability of the first side wall. Preferably, the third side wall is vertically arranged on the first side wall, and the second side wall is connected with the end part of the extending end of the third side wall at the end part of the extending end of the first side wall. Therefore, a triangular support is formed among the first side wall, the second side wall and the third side wall, and the overall stability of the extension wall is higher.
S3: mounting a triangular steel ring in a range enclosed by a connecting line of the extension wall and the other end of the starting well inlet and the starting well inlet, and embedding the inclined end of the triangular steel ring into the portal and welding and fixing the inclined end of the triangular steel ring with the portal embedded steel plate; and a steel bar mesh is laid at the top of the triangular steel ring. The triangular steel ring is provided with a preformed hole, and the preformed hole is used for reinforcing soil body cement injection slurry in the steel ring. When the triangular steel ring is installed, a welding steel plate is pre-embedded at the entrance of the starting well, then the inclined end of the triangular steel ring is embedded into the hole door and is welded and fixed with the hole door pre-embedded steel plate, and the pipe jacking machine can be installed after the inclined end of the triangular steel ring is fixed. In addition, the triangular steel ring is also provided with a water-stopping curtain cloth which is arranged at the joint of the annular flange reserved on the steel ring and fixed.
S4: installing a pipe jacking machine, breaking a tunnel portal guard post while installing the pipe jacking machine, and backfilling a triangular steel ring area;
when the push bench is installed, the portal guard pile needs to be broken first, after the portal guard pile is broken, the triangular steel ring area is backfilled by utilizing two soil filling holes reserved in the top of the steel ring, then the reserved holes are sealed, the soil body in the steel ring is reinforced by using phi 32 grouting holes reserved in the triangular steel ring, and the push bench can be normally started after the triangular light ring area is reinforced.
In addition, when the extension wall is backfilled in a range surrounded by a connecting line of the extension wall and the other end of the starting well inlet and the starting well inlet, the waterproof coating is coated firstly, and then the extension wall is backfilled by adopting C20 plain concrete.
S5: normal pipe jacking construction is carried out on the pipe jacking machine, and after the pipe jacking construction is finished, the pipe jacking machine head is lifted out;
when the push bench is used for push bench construction, the front three ring pipe pieces of the push bench are longitudinally connected and reinforced within the starting inclined shaft range. The pipe jacking pipe piece after longitudinal reinforcement is more stable in connection, the drilling stability can be guaranteed when the position backfilled after extension is drilled, and deviation in the drilling process is avoided.
As an implementation mode of the scheme, when the front three ring pipe pieces of the push bench are reinforced and connected, the steel plates with the thickness of 20mm and the width of 500mm and the distance between the embedded parts between the two segments of pipe pieces are used for connecting the pipe pieces, and the number of the ring directions is 8.
S6: dismantling the temporary backrest buttress and the backrest profile steel reaction frame after the entrance of the starting well;
after the pipe jacking of the pipe jacking machine is completed, the entrance of the starting well can be plugged only by dismantling the buttress and the reaction frame, so that the stability of pipe jacking segments in a pipe jacking channel is ensured. As another embodiment of the scheme, the extension wall further comprises a fourth side wall, the fourth side wall is arranged at the end part of the extension end of the first side wall and is perpendicular to the direction of the first side wall, and the side wall extends in the direction of the four-way jacking pipe and extends to the side edge of the jacking pipe frame. The side wall is arranged after the pipe jacking of the pipe jacking machine is completed, the pipe jacking machine can be called out from the receiving well after the pipe jacking is completed, the position of the originating well needs to be reinforced at the moment, and loosening of each part caused after the originating well is backfilled is avoided. Thus, for a pipe jacking frame with pipe jacking in place, it is first necessary to fix it at the entry to the originating well. Because the extension wall is arranged, the substantial starting port is the connecting line of the starting end vertical to the axis of the top pipe channel, and the side wall IV is arranged at the end part of the extension end of the main extension wall, so that the first-step plugging of the top pipe frame at the substantial starting port can be just realized.
S7: and performing secondary grouting plugging on the extension wall and the end wall joint ring beam.
Because the substantial inlet of the starting well is an extending area formed by the extending wall and the triangular steel sheets, a certain clearance exists between the extending position and the whole starting well, and the positions are easy to loosen, leak water and the like after the well mouth is plugged. Therefore, secondary grouting plugging needs to be carried out on some special areas after the jacking pipe is finished. And the grouting positions during the secondary grouting comprise between the entrance of the starting well and the jacking pipe sheet, between the main extension wall and the entrance of the starting well and between the main extension wall and the auxiliary extension wall. The setting of secondary slip casting system can effectually be connected and spacing prefabricated push pipe tube coupling, fills the structure clearance, avoids leaking.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A construction process for an initial end of an oblique jacking pipe is characterized by comprising the following steps: the method comprises the following steps:
s1: constructing a pipe jacking initial well and a pipe jacking receiving well, and reinforcing construction at the entrance of the initial well;
s2: constructing an extension wall, and constructing a back rest temporary buttress and a back rest section steel reaction frame at the entrance of the starting well;
s3: mounting a triangular steel ring in a range enclosed by a connecting line of the extension wall and the other end of the starting well inlet and the starting well inlet, and embedding the inclined end of the triangular steel ring into the tunnel door and welding and fixing the inclined end of the triangular steel ring with the tunnel door embedded steel plate;
s4: installing a pipe jacking machine, breaking a tunnel portal guard post while installing the pipe jacking machine, and backfilling a triangular steel ring area;
s5: normal pipe jacking construction is carried out on the pipe jacking machine, and after the pipe jacking construction is finished, the pipe jacking machine head is lifted out;
s6: dismantling the temporary backrest buttress and the backrest profile steel reaction frame after the entrance of the starting well;
s7: and performing secondary grouting plugging on the extension wall and the end wall joint ring beam.
2. The construction process for the oblique jacking pipe receiving end according to claim 1, which is characterized in that: the starting well is a special-shaped well, and the joint of the special-shaped starting well and the top pipe channel is obliquely arranged relative to the top pipe channel.
3. The construction process of the initial end of the oblique jacking pipe as claimed in claim 2, wherein: the plurality of extension walls are constructed and arranged at one end, far away from the reaction frame, of the inclined starting well inlet; and the extension wall extends to the position where the connecting line of the other end of the starting well inlet is vertical to the pipe jacking channel.
4. The construction process of the initiator of the oblique jacking pipe as claimed in claim 3, wherein: the extension wall includes a main extension wall parallel to an edge of the originating well and an auxiliary extension wall disposed on the main extension wall.
5. The construction process of the initiator of the oblique jacking pipe as claimed in claim 4, wherein: the auxiliary extension wall includes an auxiliary extension wall extending from the main extension wall toward the sidewall of the originating well and an auxiliary extension wall extending from the main extension wall toward the other end of the entrance of the originating well.
6. The construction process of the initiator of the oblique jacking pipe as claimed in claim 4, wherein the construction process comprises the following steps: and the grouting positions during the secondary grouting comprise between the entrance of the starting well and the jacking pipe sheet, between the main extension wall and the entrance of the starting well and between the main extension wall and the auxiliary extension wall.
7. The oblique jacking pipe initial end construction process according to claim 1, characterized in that: and when backfilling is carried out in a range enclosed by a connecting line of the extending wall and the other end of the starting well inlet and the starting well inlet, coating waterproof paint, and backfilling by adopting C20 plain concrete after coating.
8. The oblique jacking pipe initial end construction process according to claim 1, characterized in that: and a steel bar net piece is laid at the top of the triangular steel ring.
9. The oblique jacking pipe initial end construction process according to claim 8, wherein: the triangular steel ring is provided with a preformed hole, and the preformed hole is used for reinforcing soil body cement injection slurry in the steel ring.
10. The oblique jacking pipe initial end construction process according to claim 1, characterized in that: when the push bench carries out push bench construction, the front three ring pipe pieces of the push bench in the starting inclined shaft range are longitudinally connected and reinforced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210851723.7A CN115199813A (en) | 2022-07-19 | 2022-07-19 | Construction process for starting end of oblique jacking pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210851723.7A CN115199813A (en) | 2022-07-19 | 2022-07-19 | Construction process for starting end of oblique jacking pipe |
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| CN115199813A true CN115199813A (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210851723.7A Pending CN115199813A (en) | 2022-07-19 | 2022-07-19 | Construction process for starting end of oblique jacking pipe |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006002554A (en) * | 2004-05-20 | 2006-01-05 | Natl Inst Of Industrial Safety Independent Administrative Institution | Method for constructing slope-protection retaining wall |
| CN102486091A (en) * | 2010-12-06 | 2012-06-06 | 上海市机械施工有限公司 | Construction method for oblique tunneling of rectangular pipe jacking machine in closed space |
| CN104265301A (en) * | 2014-07-23 | 2015-01-07 | 上海隧道工程股份有限公司 | Rectangular pipe jacking large-angle obliquely crossing in-tunnel construction method |
| CN210564534U (en) * | 2019-06-21 | 2020-05-19 | 广东省基础工程集团有限公司 | Rectangular pipe jacking oblique crossing construction structure |
| CN112012753A (en) * | 2020-09-17 | 2020-12-01 | 江苏西尔德建设工程有限公司 | Shield tunneling machine starting method based on special-shaped extension steel ring |
| CN113294166A (en) * | 2021-05-20 | 2021-08-24 | 北京建工土木工程有限公司 | Large-section rectangular jacking pipe oblique starting method |
| CN215057406U (en) * | 2021-05-20 | 2021-12-07 | 北京建工土木工程有限公司 | Extension structure is originated in rectangle push pipe slant |
| CN113756832A (en) * | 2021-09-28 | 2021-12-07 | 中铁一局集团有限公司 | Large-section rectangular oblique-crossing pipe jacking construction method |
-
2022
- 2022-07-19 CN CN202210851723.7A patent/CN115199813A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006002554A (en) * | 2004-05-20 | 2006-01-05 | Natl Inst Of Industrial Safety Independent Administrative Institution | Method for constructing slope-protection retaining wall |
| CN102486091A (en) * | 2010-12-06 | 2012-06-06 | 上海市机械施工有限公司 | Construction method for oblique tunneling of rectangular pipe jacking machine in closed space |
| CN104265301A (en) * | 2014-07-23 | 2015-01-07 | 上海隧道工程股份有限公司 | Rectangular pipe jacking large-angle obliquely crossing in-tunnel construction method |
| CN210564534U (en) * | 2019-06-21 | 2020-05-19 | 广东省基础工程集团有限公司 | Rectangular pipe jacking oblique crossing construction structure |
| CN112012753A (en) * | 2020-09-17 | 2020-12-01 | 江苏西尔德建设工程有限公司 | Shield tunneling machine starting method based on special-shaped extension steel ring |
| CN113294166A (en) * | 2021-05-20 | 2021-08-24 | 北京建工土木工程有限公司 | Large-section rectangular jacking pipe oblique starting method |
| CN215057406U (en) * | 2021-05-20 | 2021-12-07 | 北京建工土木工程有限公司 | Extension structure is originated in rectangle push pipe slant |
| CN113756832A (en) * | 2021-09-28 | 2021-12-07 | 中铁一局集团有限公司 | Large-section rectangular oblique-crossing pipe jacking construction method |
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