CN114856611A - Subway bypass reverse well pipe pulling method construction process - Google Patents
Subway bypass reverse well pipe pulling method construction process Download PDFInfo
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- CN114856611A CN114856611A CN202210444412.9A CN202210444412A CN114856611A CN 114856611 A CN114856611 A CN 114856611A CN 202210444412 A CN202210444412 A CN 202210444412A CN 114856611 A CN114856611 A CN 114856611A
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- 238000000034 method Methods 0.000 title claims abstract description 75
- 238000010276 construction Methods 0.000 title claims abstract description 72
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 230000001681 protective effect Effects 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
- E21D19/04—Provisional protective covers for working space for use in drifting galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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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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Abstract
The invention discloses a subway bypass reverse well pipe-pulling construction process, which comprises the following steps: (A) respectively performing locking construction on the left and right side channel ports; (B) constructing a drilling foundation in the right side tunnel, and installing a horizontal raise boring machine on the drilling foundation; constructing a horizontal guide hole from the port of the bypass channel on the right side to the port of the bypass channel on the left side by using the horizontal raise boring machine; (C) constructing until the horizontal guide hole is communicated with the left tunnel, and finishing the construction of the horizontal guide hole; then, carrying out reaming drilling construction, and simultaneously carrying out temporary support on the reamed drill hole by using a traction pipe; (D) and (5) forming the concrete lining pouring bypass. The invention is suitable for the narrow space of the bypass construction, has simple operation and convenient popularization, effectively solves the control problem of ground settlement, and is also favorable for further widening the application range of the raise boring machine.
Description
Technical Field
The invention relates to the technical field of horizontal hole drilling and supporting. In particular to a subway by-pass reverse well pipe-pulling construction process.
Background
In recent years, with the progress of national urbanization, urban subways have been developed, and the number of side channel projects is increased, but the degree of mechanized construction is not high. And constructing No. 2 and No. 8 of Shanghai subway by adopting grid jacking pipes. In 2018, in 1 month, a connection channel between Ningbo rail transit No. 3 line south areas is constructed by a shield method, and belongs to the world for the first time. The working well of the Germany fourth Yibeihe tunnel, the Hongkong Tunmen submarine highway tunnel and the Japan Yutang tendon comprehensive pipe gallery engineering adopts the pipe jacking method for construction. However, due to the narrow construction site, the degree of mechanized construction of the domestic bypass engineering is not high, and the construction of the pipe jacking method and the shield method cannot be widely popularized.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a new process more suitable for the mechanized construction of the side channel, which is suitable for the narrow space of the side channel construction, is simple to operate and convenient to popularize, effectively solves the problem of controlling ground settlement, and is also beneficial to further widening the application range of the raise boring machine.
In order to solve the technical problems, the invention provides the following technical scheme:
a subway by-pass reverse well pipe pulling method construction process comprises the following steps:
(A) respectively performing locking construction on a left side port and a right side port of the bypass, wherein the left side port of the bypass is positioned on the inner side wall of the left side tunnel, the right side port of the bypass is positioned on the inner side wall of the right side tunnel, and a hoisting cross beam is installed at the top of the left side tunnel and a pile casing installation platform is constructed at the bottom of the left side tunnel;
(B) constructing a drilling foundation in the right side tunnel, and installing a horizontal raise boring machine on the drilling foundation; constructing a horizontal guide hole from the port of the bypass channel on the right side to the port of the bypass channel on the left side by using the horizontal raise boring machine;
(C) constructing until the horizontal guide hole is communicated with the left tunnel, and finishing the construction of the horizontal guide hole; then, carrying out reaming drilling construction, and simultaneously carrying out temporary support on the reamed drill hole by using a traction pipe;
(D) and (5) forming the concrete lining pouring bypass.
The subway bypass shaft reversing pipe pulling method construction process specifically comprises the following steps in the step (C):
(C-1) connecting the reaming bit and the rotatable casing into a relatively fixed whole through a lifting beam to form a rotatable casing and bit assembly;
(C-2) connecting the rotatable protecting cylinder and the drill bit assembly with a drill rod, starting a horizontal raise boring machine to carry out reaming construction, carrying out rotary reaming on the rotatable protecting cylinder and the drill bit assembly and advancing towards the direction of the right tunnel, and carrying away dregs generated in the reaming process manually or mechanically;
(C-3) before the rotatable casing and the drill bit assembly are about to completely enter the soil body or the rock body, connecting the non-rotatable casing and the rotatable casing with the rotatable casing on the drill bit assembly by adopting a rotary joint to form a casing and drill bit assembly, dragging the non-rotatable casing to advance by the rotatable casing and the drill bit assembly, and enabling the non-rotatable casing to only linearly move along with the rotatable casing and the drill bit assembly;
and (C-4) with the progress of reaming construction, the non-rotatable protective sleeve needs to be discontinuously connected to the protective sleeve and the drill bit assembly until reaming is finished, and a bypass channel is preliminarily formed.
The subway bypass shaft reversing pipe-pulling method construction process comprises the following steps of (C-1): the reaming bit and the rotatable protective cylinder are connected into a whole to rotate together through the horizontal clamping groove of the rotatable protective cylinder; the horizontal clamping groove is fixedly arranged on the inner wall of the rotatable pile casing and is parallel to the axis of the rotatable pile casing, and a convex strip is fixedly arranged on the circumferential edge of the bottom surface of the reaming bit; the convex strip is positioned in the groove of the horizontal clamping groove and is in clearance fit with the inner wall of the groove.
The subway bypass shaft reversing pipe-pulling method construction process comprises the following steps of (C-3): the interface between the non-rotatable casing overlaps 3cm, along the direction of advance of reamer bit: the port of the rear non-rotatable casing is arranged on the inner side, and when the non-rotatable casing slides forwards in a straight line, the resistance is reduced.
According to the subway bypass reverse shaft pipe pulling method construction process, the non-rotatable pile casings are connected through welding.
According to the subway bypass reverse well pipe pulling method construction process, each section of the non-rotatable pile casing is provided with a grouting hole, and a valve is installed in each grouting hole.
The subway bypass shaft reversing pipe-pulling method construction process comprises the following steps of (C-3): each section of the non-rotatable protective cylinder is provided with a male joint at one end close to the hole expanding drill bit and a female joint at one end far away from the hole expanding drill bit; the male connector and the female connector are in concave-convex fit, and the two adjacent non-rotatable protective sleeves are relatively fixed through the non-rotatable protective sleeve connectors.
The subway bypass shaft reversing pipe-pulling method construction process comprises the following steps of (C-3): the interface between the non-rotatable pile casing and the rotatable pile casing is overlapped by 3 cm.
In the construction process of the subway bypass reverse shaft pipe pulling method, the non-rotatable pile casing is connected with the rotatable pile casing through a male joint at one end, and the rotatable pile casing is connected with the non-rotatable pile casing through a female joint at one end; the male connector is in concave-convex fit with the female connector; the rotary joint is arranged in the cylinder at the joint of the non-rotatable casing and the rotatable casing.
The technical scheme of the invention achieves the following beneficial technical effects:
(1) compared with shield and pipe-jacking construction, the construction method effectively solves the difficult problem of low-cost mechanical rapid construction of the side channel for rock or water-free and water-poor stratum, and simultaneously performs the procedures of excavation and temporary support of the side channel, thereby greatly simplifying the complexity of mechanical construction and facilitating popularization and application of the construction.
(2) The invention solves the control problem of ground settlement by researching the seamless connection of horizontal reaming and temporary support of the raise boring machine. Compared with shield method and pipe-jacking method construction, the construction method is more suitable for narrow sites for bypass construction, has high efficiency, short construction period and simple working procedures and is low in cost, a more practical new way is developed for bypass mechanical construction, and the application range of the raise boring machine is further widened.
Drawings
FIG. 1 is a schematic diagram of a subway bypass shaft reversing pipe-pulling method construction process;
FIG. 2 is a schematic diagram of raise boring machine installation and horizontal guide hole construction in the construction process of the subway bypass raise-boring pipe-pulling method;
fig. 3a is a schematic structural diagram of an unrotatable casing in a subway bypass shaft reversing pipe-pulling method construction process, fig. 3b is a schematic structural diagram of a rotatable casing in a subway bypass shaft reversing pipe-pulling method construction process, fig. 3c is a schematic structural diagram of a reamer in a subway bypass shaft reversing pipe-pulling method construction process, and fig. 3d is a schematic structural diagram of a rotatable casing and a drill bit assembly in a subway bypass shaft reversing pipe-pulling method construction process;
FIG. 4 is a combination of an unrotatable casing, a rotatable casing and a reamer in the construction process of the subway bypass raise-shaft pipe-pulling method of the invention;
FIG. 5 is a schematic view of a connection structure of a non-rotatable pile casing and a rotatable pile casing in the construction process of the subway bypass reversing shaft pipe pulling method;
fig. 6 is a schematic view of a connection structure of a rotatable protection cylinder and a reamer bit in the subway bypass raise-shaft pipe-pulling method construction process.
In the figure: 1-left side tunnel; 2-right side tunnel; 3-bypass (communication) channel; 4-a bypass port; 5-a drill foundation; 6-protecting the barrel mounting platform; 7, hoisting the cross beam; 8-horizontal raise boring machine; 9-horizontal pilot hole (drill rod); 10-non-rotatable guard cylinder; 11-a rotatable casing and bit assembly; 12-a rotary joint; 13-non-rotatable casing joint; 14-a rotatable casing; 15-expanding a hole drill bit; 16-casing and bit combination.
Detailed Description
As shown in fig. 1 to 4, a concrete implementation manner of the construction process of the subway bypass shaft reversing pipe pulling method in the embodiment includes the following steps:
A. before the raise boring machine and the casing enter the field, the port 4 of the left bypass channel and the port of the right bypass channel are respectively subjected to locking construction, and the reinforcing strength is determined by calculation according to the soil layer or surrounding rock conditions. The left side of the tunnel is provided with a side channel port 4, the right side of the tunnel is provided with a side channel port 4, the side channel port 4 is positioned on the inner side wall of the left side tunnel 1, the right side of the tunnel is provided with a side channel port 4, the top of the left side tunnel 1 is provided with a hoisting cross beam 7, and the bottom of the left side tunnel 1 is provided with a construction casing mounting platform 6.
B. Constructing a drilling foundation 5 in the right side tunnel 2, wherein the tensile capacity during reaming is mainly considered in the design of the drilling foundation 5; and a horizontal raise boring machine 8 is arranged on the drilling foundation 5; and constructing a horizontal guide hole 9 from the right side bypass channel port 4 to the left side bypass channel port 4 by using the horizontal raise boring machine 8.
C. Constructing until the horizontal guide hole 9 is communicated with the left tunnel 1, and finishing the construction of the horizontal guide hole 9; and then carrying out reaming drilling construction, and simultaneously carrying out temporary support on the reamed drill hole by using the traction pipe. The method specifically comprises the following steps:
c-1, connecting a hole expanding drill bit 15 and a rotatable casing 14 into a relatively fixed whole through a hoisting cross beam 7 to form a rotatable casing and drill bit combined body 11;
as shown in fig. 6, the reamer bit 15 and the rotatable casing 14 are connected to rotate integrally through the horizontal slot 18 of the rotatable casing 14; the horizontal clamping groove 18 is fixedly installed on the inner wall of the rotatable casing 14 and is parallel to the axis of the rotatable casing 14, and a convex strip 17 is fixedly installed on the circumferential edge of the bottom surface of the reaming bit 15; the convex strip 17 is positioned in the groove of the horizontal clamping groove 18 and is in clearance fit with the inner wall of the groove. The reamer bit 15 can freely slide horizontally along the horizontal clamping groove 18, and can drive the rotatable casing 14 to synchronously rotate when rotating.
C-2, connecting the rotatable protecting cylinder and drill bit assembly 11 with a drill rod 9, starting a horizontal raise boring machine 8 for reaming construction, rotatably reaming the rotatable protecting cylinder and drill bit assembly 11 and advancing towards the right tunnel 2, and manually or mechanically transporting away dregs generated in the reaming process;
c-3, before the rotatable casing and drill bit assembly 11 is about to completely enter the soil body or rock body, connecting the non-rotatable casing 10 with the rotatable casing 14 on the rotatable casing and drill bit assembly 11 by using a rotary joint 12 to form a casing and drill bit assembly 16, drawing the non-rotatable casing 10 to advance through the rotatable casing and drill bit assembly 11, and dragging the non-rotatable casing 10 to advance when the non-rotatable casing 10 only rotates and advances along with the rotatable casing and drill bit assembly 11 in a linear motion and the reaming drill bit 15 and the rotatable casing 14 rotate together, so that reaming and supporting are simultaneously carried out until reaming is finished;
as shown in fig. 5, the interface between the non-rotatable casing 10 overlaps by 3cm, and in the advancing direction of the reamer bit 15: the port of the succeeding non-rotatable casing 10 is inside, and when the non-rotatable casing 10 slides straight forward, the resistance is reduced. Each section of the non-rotatable guard cylinder 10 is provided with a grouting hole, and a valve is arranged in the grouting hole. Each section of the non-rotatable protective sleeve 10 is provided with a male connector at one end close to the hole expanding drill bit 15 and a female connector at one end far away from the hole expanding drill bit 15; the male connector and the female connector are in concave-convex fit, and two adjacent non-rotatable protective sleeves 10 are relatively fixed through non-rotatable protective sleeve connectors 13. The interface between the non-rotatable casing 10 and the rotatable casing 14 is overlapped by 3 cm; a male joint is arranged at one end of the non-rotatable pile casing 10 connected with the rotatable pile casing 14, and a female joint is arranged at one end of the rotatable pile casing 14 connected with the non-rotatable pile casing 10; the male connector is in concave-convex fit with the female connector; the rotary joint 12 is mounted in the cylinder at the junction of the non-rotatable casing 10 and the rotatable casing 14, the rotary joint 12 being of a design known in the art, with the purpose of converting rotational linear motion into only remaining linear motion, for example: when urban pipelines are laid by the trenchless horizontal directional drilling machine in the prior art, the drill rod is connected with the rotary drill bit, the rotary drill bit is connected with the pipelines, the drill rod and the rotary drill bit rotate together and do linear motion to the right (left), and the pipelines do not rotate but do linear motion to the right (left) while drilling heads.
C-4, as the reaming construction is carried out, non-rotatable protecting cylinders 10 need to be discontinuously connected to the protecting cylinder and drill bit assembly 16, and the non-rotatable protecting cylinders 10 are connected through welding; until the reaming is finished, the bypass channel 3 is formed preliminarily.
D. And (3) concrete lining pouring bypass channel forming: and after reaming, removing the reaming bit and the drilling machine, and beginning to pour concrete according to the design requirement to form a side channel. And (3) before pouring, splicing and reserving the grouting holes in the pile casing, and after the concrete reaches the designed strength, filling and grouting the side channel wall.
In the technical scheme of the invention:
(1) the port of the left side channel and the port of the right side channel are subjected to locking construction, the orifice support is reinforced, and the hoisting crossbeam is mainly used for installing a reaming bit and splicing a ribbed steel plate protective cylinder.
(2) When the raise boring machine is installed, attention is paid to the transmission of tension force during reaming, and the tension force of a foundation of the drilling machine needs to be calculated. The construction of horizontal guide holes is similar to that of vertical guide holes of a reverse well.
(3) When the hole expanding drill bit rotates, the rotatable protecting cylinder rotates along with the drill bit; when the drill bit needs to be overhauled or the hob needs to be replaced, the reaming drill bit can slide along the horizontal clamping groove on the rotatable protective cylinder to move back and forth, and personnel and overhauling equipment enter the front face of the hob through the slag sliding opening of the drill bit body to operate.
(4) The rotatable casing protects except that temporary support, also prevents simultaneously that the reaming bit from drooping, because the reaming bit itself is not axisymmetric, if do not have rotatable casing in the soil layer, reaming forward route and guiding hole track have great difference.
(5) For the dregs expanded from the side channel, the dregs can be directly transported to a dregs car by a belt, but if the amount of the dregs is not large, the dregs can also be directly discharged manually.
(6) When the rotatable casing connected with the expanding bit enters the rock mass or the soil mass, the rotatable casing is subsequently connected with the non-rotatable casing, and the rotatable casing and the non-rotatable casing are connected through the rotary joint.
(7) The non-rotatable guard cylinders can be directly connected by multiple nodes and can also be connected by full-perimeter welding. Each section of non-rotatable protective cylinder is provided with 4 grouting holes (internally connected valves) for injecting lubricant to reduce the advancing resistance of the protective cylinder.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (9)
1. A subway by-pass reverse well pipe pulling method construction process is characterized by comprising the following steps:
(A) respectively performing locking construction on a left side channel port and a right side channel port (4), wherein the left side channel port (4) is positioned on the inner side wall of a left side tunnel (1), the right side channel port (4) is positioned on the inner side wall of a right side tunnel (2), and a hoisting cross beam (7) is installed at the top of the left side tunnel (1) and a pile casing installation platform (6) is constructed at the bottom of the left side tunnel (1);
(B) constructing a drilling foundation (5) in the right side tunnel (2), and installing a horizontal raise boring machine (8) on the drilling foundation (5); constructing a horizontal guide hole (9) from the bypass port (4) on the right side to the bypass port (4) on the left side by using the horizontal raise boring machine (8);
(C) constructing until the horizontal guide hole (9) is communicated with the left tunnel (1), and finishing the construction of the horizontal guide hole (9); then, carrying out reaming drilling construction, and simultaneously carrying out temporary support on the reamed drill hole by using a traction pipe;
(D) and (5) forming the concrete lining pouring bypass.
2. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 1, wherein the step (C) comprises the following steps:
(C-1) connecting the reaming bit (15) and the rotatable casing (14) into a relatively fixed whole through a hoisting cross beam (7) to form a rotatable casing and bit assembly (11);
(C-2) connecting the rotatable protecting cylinder and drill bit assembly (11) with a drill rod (9), starting a horizontal raise boring machine (8) to carry out reaming construction, rotatably reaming the rotatable protecting cylinder and drill bit assembly (11) and advancing towards the direction of the right tunnel (2), and manually or mechanically transporting away dregs generated in the reaming process;
(C-3) before the rotatable casing and drill bit assembly (11) is about to completely enter the soil body or the rock body, connecting the non-rotatable casing (10) with the rotatable casing (14) on the rotatable casing and drill bit assembly (11) by using a rotary joint (12) to form a casing and drill bit assembly (16), dragging the non-rotatable casing (10) to advance through the rotatable casing and drill bit assembly (11), and enabling the non-rotatable casing (10) to only do linear motion along with the rotatable casing and drill bit assembly (11);
(C-4) as the reaming construction is carried out, the non-rotatable protecting cylinder (10) needs to be discontinuously connected to the protecting cylinder and drill bit combined body (16) until the reaming is finished, and the bypass channel (3) is formed preliminarily.
3. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 2, wherein in the step (C-1): the reaming bit (15) and the rotatable casing (14) are connected into a whole to rotate together through a horizontal clamping groove (18) of the rotatable casing (14); the horizontal clamping groove (18) is fixedly arranged on the inner wall of the rotatable casing (14) and is parallel to the axis of the rotatable casing (14), and a convex strip (17) is fixedly arranged on the circumferential edge of the bottom surface of the reaming bit (15); the convex strips (17) are positioned in the grooves of the horizontal clamping grooves (18) and are in clearance fit with the inner walls of the grooves.
4. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 2, wherein in the step (C-3): the joints between the non-rotatable protective cylinders (10) are overlapped by 3cm, and along the advancing direction of the expanding bit (15): the port of the rear non-rotatable casing (10) is arranged at the inner side, and when the non-rotatable casing (10) slides forwards in a straight line, the resistance is reduced.
5. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 3 or 4, wherein the non-rotatable casing pipes (10) are connected through welding.
6. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 3 or 4, wherein each section of the non-rotatable casing (10) is provided with a grouting hole, and a valve is installed in the grouting hole.
7. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 4, wherein in the step (C-3): one end of each section of the non-rotatable casing (10) close to the hole expanding drill bit (15) is a male connector, and one end of each section of the non-rotatable casing far away from the hole expanding drill bit (15) is a female connector; the male connector and the female connector are in concave-convex fit, and the two adjacent non-rotatable pile casings (10) are relatively fixed through the non-rotatable pile casing connectors (13).
8. The construction process of the subway bypass reversing shaft pipe pulling method according to claim 2, wherein in the step (C-3): the interface between the non-rotatable casing (10) and the rotatable casing (14) is overlapped by 3 cm.
9. The reverse well pipe pulling method construction process of the subway bypass channel according to claim 8, wherein a male joint is arranged at one end of the non-rotatable pile casing (10) connected with the rotatable pile casing (14), and a female joint is arranged at one end of the rotatable pile casing (14) connected with the non-rotatable pile casing (10); the male connector is in concave-convex fit with the female connector; the rotary joint (12) is arranged in the cylinder at the joint of the non-rotatable casing (10) and the rotatable casing (14).
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| CN112943256A (en) * | 2021-01-25 | 2021-06-11 | 西安建筑科技大学 | Construction method of prefabricated pipe-jacking working well |
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