KR20230115360A - a diameter enlargement beat modular system in ground excavation device for multi-axis auger - Google Patents

Abstract

The present invention is a ground improvement in which cement and water are mixed in the soft ground excavated by the DCM (Deep Cement Mixing Method) method, and the reacted hydration product is injected into the ground and mixed by rotation with a special stirrer to form a solidified modified body in the ground. It is a modular expansion bit modular system of a deep ground excavator for a multi-axial auger used in an improvement device. A ring gear wheel center core cradle flange 204a, which is fixed at an angle of 45 degrees to each other on the front and rear surfaces of the gear wheel 202, and has upper and lower flanges; " "With the center core bracket (204b) of the older brother; At the 4-way end of the center core bracket (204b) " "The front and rear surfaces of each T end of the ring gear ring fixing bracket (204c) of the ring gear ring center core cradle (204) consisting of ring gear ring fixing brackets (204c) whose upper and lower middle surfaces are reinforced with ribs and whose T ends are spaced apart It is fixed to the rim of the ring gear wheel 202, and the inside of the roller chain 202e between the ring gear ring fixing brackets 204c on all sides of the center core bracket 204b is a ring gear in a vertical symmetry by two equations each in the east-west and north-south directions It relates to a modular system for expanding deep ground excavators for multi-axis augers, characterized in that the wheel drive spur flanges 203 are arranged and coupled.

Description

{ a diameter enlargement beat modular system in ground excavation device for multi-axis auger}

The present invention relates to a modular expansion bit system for a deep ground excavator for a multi-axis auger, and in detail, while injecting a hydration product reacted by mixing cement and water in soft ground excavated by a DCM (Deep Cement Mixing Method) method, It relates to a modular expansion bit modular system of a multi-axial auger deep-sea excavator used in a ground improvement improvement device that rotates and mixes with a special agitator to form a solidified improved body in the ground.

As a countermeasure for soft ground improvement for deep soft ground improvement, since the technology was initially introduced in the United States, Japan has improved and improved technology and developed many independent technologies, known as the DCM (Deep Cement Mixing) method. The technique is widely spread.

The DCM method is a ground excavation device used in a method of solidifying and stabilizing deep soft ground excavated on land or sea soft ground with improved soil using cement slurry as a stabilizer. An auger drive unit installed on the upper part of the crawler crane leader to be installed, a plurality of excavation rods connected to the bottom of the auger drive unit, and a plurality of excavation rods connected to each of the plurality of connection rods, with stirring blades in the upper layer and lowermost layer of the excavation rod for excavating the ground in the lower layer. It is composed of a drilling rod with an auger head in it.

As a deep-low ground excavator according to the DCM method, as in the embodiment of the present applicant's seafarer's invention No. 10-2022-0006060 "Hydraulic telescopic rod type ground excavator for deep-bottom soft ground improvement" At the center of the connection rod and the excavation rod, a central supply or double pipe supply passage is provided to supply and transport cement slurry to the soil layer of the deep bottom to be excavated. way to do it.

Although there are cases in which general and pipe expansion are performed simultaneously as a drilling hole structure according to the DCM method, the excavation bit of a conventional deep ground excavator has a fixed working radius and constructs a long column and separately constructs a short column next to it to overlap each other. The connection method makes the construction inefficient and lengthens the construction period.

As a related technology, the gist according to Korean Patent Registration No. 10-1031447 is "a piston is provided on both sides, a pressurizing plate for forming protrusions is connected to the outer side of the piston by a connecting means, and a plurality of hydraulic pressures are connected by connecting bars vertically. The protrusion forming machine for ground drilling, which includes a cylinder, a reinforcing frame mounted on top of the hydraulic cylinder at the top, and a housing provided on the top of the reinforcing frame, inserts the protrusion forming machine into a substantially circular hole and stops at a desired height. After that, the two-way pressure plate presses the perforated wall side by the two-way piston to push the east-west or north-south walls to form protrusions, and contracts and rotates again to repeatedly form protrusions on the other wall. Separate ground drilling machine Inconvenience of having to perform the protrusion forming operation separately by inserting the protrusion forming machine into the drilled hole that has to be performed with the puncture, and the problem of delaying the air always exist.

In a similar way, the gist according to Korean Patent Registration No. 10-1031433 is "a piston is provided on both sides, a hydraulic motor for bit rotation is connected to the outer side of one piston, and a tricone bit is connected to the output shaft of the hydraulic motor for rotating the bit. is mounted, and the hydraulic motor for rotating the bit is a "protrusion forming machine for ground drilling" composed of a "hydraulic cylinder device reciprocating through a slide provided in the frame", and a hydraulic motor is attached to the output part of the double-acting hydraulic cylinder for rotation again. A method of horizontally pressing both ends of the rotating tricone bit by mounting a tricone bit is added, but the problem of having to insert a protrusion forming machine into the drilling to be performed with a separate ground drilling machine as described above to form protrusions entails

In addition, Korean Patent Registration No. 10-1229209 discloses that a wing bit is raised by a pilot bit and protrudes outward from the guide device so as to perform both general drilling and enlarged drilling as one hammer bit, and in case of general drilling, the pilot bit As it descends, the wing bit descends by its own weight and is located at the bottom of the guide device. It is coupled to a hammer drill or drill rod and is used only for drilling boreholes while vibrating and rotating. Excavation according to the DCM method It is different from the purpose applied to the improvement method by mixing cement and water in the ground and injecting the reacted hydration product into the ground and mixing it by rotation with a special agitator.

Similar to the above, in the case of Korean Patent Registration No. 10-1514338, the bit system for a ground excavation hammer includes a guide device inserted into a casing tube to excavate the ground, a bit housing fastened with the guide device, and the bit housing. It is characterized in that it consists of a wing bit fastened to rotate in the bit groove on both sides and a pusher inserted into the axis of the body of the bit housing. The wing bit can be slowly rotated by the pusher to gradually expand the drilling inner diameter, but also DCM It is different from the purpose applied to the improvement method by mixing cement and water in the excavated deep soft ground according to the method and injecting the reacted hydration product into the ground while rotating and mixing it with a special agitator.

[Document 1] KR 10-1031447 (B1) 2011.04.19 [Document 2] KR 10-1031433 (B1) 2011.04.19 [Document 3] KR 10-1229209 (B1) 2013 01.28 [Document 4] KR 10-1514338 (B1) 2015.05.08

In view of the various problems in the prior art as described above, the present invention is a multi-axial auger deep-bottom excavator for reducing air used in excavation work according to the DCM method for strengthening soft ground and improving the improvement effect. It is intended to provide a modular expansion bit system, while performing single construction by auger head and stirring blades with a fixed bit working radius, excavation at the bottom through an expansion bit module composed of an expansion bit square tube rod and an expansion bit square tube tube. As the cement slurry supplied to the core bottom of the bit module is simultaneously supplied, the agitation blades agitate the cement sludge while the auger head is excavating, and at the same time, the auger head causes The DCM method is implemented in various ways such as T-shaped, O-shaped, and Y-shaped through the expansion bit modular system of deep ground excavator for multi-axial auger, which allows simultaneous expansion of holes with a diameter larger than the single column diameter and stirring of cement sludge. It is intended to enable construction

Therefore, in the present invention, the present invention mixes cement and water in the soft ground excavated by the DCM (Deep Cement Mixing Method) method, and while injecting the reacted hydration product into the ground, it is rotated and mixed with a special stirrer to improve the solidified material in the ground It is an expansion bit modular system of a multi-axis auger deep-sea excavator used in a ground improvement improvement device to create a ground improvement system. Doedoe fixed at an angle of 45 degrees, ring gear ring center core cradle flange formed with upper and lower flanges; " "With my brother's center core bracket; at the four ends of the center core bracket" "The upper and lower middle surfaces of the ring gear ring fixing brackets of the ring gear ring center core cradle consisting of ring gear ring fixing brackets reinforced with ribs and spaced apart T ends are fixed to the ring gear wheel rims on the front and rear surfaces of each T end, The ring gear wheel drive spur flange is arranged vertically symmetrically in the east-west and north-south directions in the inner teeth of the roller chain between the center core bracket and the four-sided ring gear ring fixing bracket. By providing a system to expand and contract the diameter of the expansion bit module, it is possible to construct a single column with an auger head immediately after expanding and then performing a long construction. It is intended to provide a bit modular system.

The present invention is a ground improvement in which cement and water are mixed in the soft ground excavated by the DCM (Deep Cement Mixing Method) method, and the reacted hydration product is injected into the ground and mixed by rotation with a special stirrer to form a solidified modified body in the ground. It is an expansion bit modular system of a deep ground excavator for a multi-axis auger used in the improvement device. Through the expansion bit module composed of an expansion bit square pipe rod and an expansion bit square tube tube, the cement slurry supplied to the deep bottom of the drilling bit module at the bottom is simultaneously While excavation is being carried out with the auger head, the stirring blades agitate the cement sludge, and at the same time expand the cement sludge with a larger diameter than the single column diameter by the auger head according to the expansion and contraction operation of the expansion and contraction part of the expansion bit module. The agitation of the sludge is also made to proceed simultaneously. In the soft ground excavation work improvement project, the long construction work is performed immediately after the expansion work immediately after the auger head construction, and the DCM method in various ways such as T-shaped, O-shaped, and Y-shaped It is a useful invention that enables the construction of many improved bodies in a short working time in a variety of ways.

1 is a state diagram of a use state of a deep-low excavator diameter expansion bit module for a multi-axis auger according to the present invention
Figure 2 is a state of use of the expansion bit module assembled in the ground excavation module according to the present invention
Figure 3 is a perspective view of the separated state of the expansion bit module showing a state separated from the ground excavation module in the state diagram of Figure 2
Figure 4 is a perspective view of the assembled state of the main part expansion bit module according to the present invention
Figure 5 is a perspective view of the main part separated state of the expansion bit module according to the present invention
Figure 6 is an exploded perspective view of the "A" portion of FIG.
Figure 7 is a reference exploded perspective view in the direction of the bottom view of Figure 6
Figure 8 is a cutout and partially enlarged cross-sectional view of the main part of the expansion and contraction part of the "A" part of FIG.
9 (a) (b) is a perspective view and a side view of a ring gear wheel drive spur flange which is a main part according to the present invention

A detailed description of a specific embodiment of the modular excavator bit expansion system for multi-axis augers according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the state of use of the diameter expansion bit module for multi-axis auger deep-sea ground excavator according to the present invention, and the posting of prior patent application No. 10-2022-0006060 "Hydraulic telescopic rod type ground excavation device for deep-sea soft ground improvement" Similarly, the diameter expansion bit module 200 of the present invention includes a 4-axis square tube expansion auger rod 100a and a center core square tube expansion guide 100b installed above the crawler crane 1 and leader 2 installed on the deck of the land or sea. ) And the ground excavation modular 100 is assembled in multi-stage connection; Assembled and installed between the excavation bit modules 300 composed of the agitation blades 300b on the upper layer of the excavation bit rod 300a, which is normally connected to the lower end of the excavation rod module, and the auger head 300c excavating the ground on the lower layer.

Figure 2 is a state diagram of the state of use of the diameter expansion bit module assembled in the ground excavation module according to the present invention, Figure 3 is a perspective view of the separated state of the diameter expansion bit module showing a state separated from the ground excavation module in the state diagram of FIG. In order to supplementarily explain the state of use of the diameter expansion bit module 200 according to the present invention, the ground excavation module 100 and the excavation bit module 300 in the functional operation description of the diameter expansion bit module 200 to be described later We want to supplement the correlation behavior.

Figure 4 is a perspective view of an assembled state of the diameter expansion bit module, which is the main part according to the present invention, and Figure 5 is a perspective view of the main part of the diameter expansion bit module according to the present invention, as shown in the separated state, the multi-axis auger deep-sea excavator according to the present invention, the diameter expansion bit modular The main part of the expansion bit module 200 is a ring gear wheel in which a two-stage telescoping type expansion bit expansion unit 201 composed of an expansion bit square tube rod 201a and a diameter expansion bit square tube 201b is vertically spaced apart ( 202) a ring gear ring center core cradle flange 204a fixed at an angle of 45 degrees to each other on the front and rear surfaces, and flanged vertically; " "With the center core bracket (204b) of the older brother; At the 4-way end of the center core bracket (204b) " "The front and rear surfaces of each T end of the ring gear ring fixing bracket (204c) of the ring gear ring center core cradle (204) consisting of ring gear ring fixing brackets (204c) whose upper and lower middle surfaces are reinforced with ribs and whose T ends are spaced apart It is fixed to the rim of the ring gear wheel 202, and the inside of the roller chain 202e between the ring gear ring fixing brackets 204c on all sides of the center core bracket 204b is a ring gear in a vertical symmetry by two equations each in the east-west and north-south directions The wheel drive spur flange 203 is arranged and coupled.

The detailed configuration of the ring gear wheel 202 is shown in FIG. 6, which is an exploded perspective view of the “A” part of FIG. 5, the expansion and contraction expansion bit and the ring gear wheel, and FIGS. 7 and 5, which are exploded perspective views for reference in the bottom view direction of FIG. As shown in FIG. 8, which is a cutout and partially enlarged cross-sectional view of the “A” part expansion bit expansion and contraction part and ring gear ring part of

The ring gear ring upper cover 202a having the steel ball semi-groove 1 (202a') formed on the inner vertical part of the "a" shaped ring cross section, and the ring border inscribed with the ring gear ring upper cover 202a but protruding to the center An O-ring 1 (202h) and a lip packing (202g) buried portion are provided on the upper side of the chain pin hole 1 (202f') in contact with the inside, and a steel ball half groove 2 (202c') is formed on the inner wall. Chain setting ring bracket (202c) is formed, but the steel ball half groove 1 (202a') and the steel ball half groove 2 (202c') are closed after filling the steel ball hole (202d') with the steel ball 202d' on the outside of the ring gear ring upper cover (202a). do it,

One end of the roller chain 202e is fastened with the chain pin 202f to the chain pin hole 202f' of the ring edge protruding from the center of the chain setting ring bracket 202c, and the other end has the same outer diameter as the upper ring of the ring gear It is fastened to the chain pin hole 2 (202b') corresponding to the chain pin hole 1, and the contact surface with the chain setting ring bracket (202c) is integrally fixed,

It is composed of the ring gear ring upper cover 202a and the ring gear ring lower cover 202b in which an O-ring 2 (202h') buried portion is formed on the contact surface.

According to the present invention, the ring gear wheel fixing bracket 204c of the ring gear wheel center core cradle 204 supported in a stationary state is fitted to the ring gear wheel upper cover 202a to maintain a stationary state. In the supported state, the ring gear wheel lower cover 202b, which is inscribed with the ring gear wheel fixing bracket 204c and rolled by the steel ball 202d, and prevents dust inflow by the O-ring 202h and the lip packing 202g, is a material As the low idling, the expansion and contraction bit expansion unit 201 fixed vertically on the bottom part is idling as it is expanded and contracted by inertial force.

As described above, unlike the case where the diameter expansion bit expansion part 201 fitted to the ring gear wheel lower cover 202b is idling, the ring gear wheel center core cradle 204 of the ring gear wheel 202 is the ground excavation module 100 The ring gear wheel upper cover 202a fitted with the center core square pipe expansion guide 100b and the center core bracket 204b and the ring gear ring fixing bracket 204c are maintained in a fixed state. .

On the other hand, the driving source for idling by the diameter expansion bit expansion unit 201 fitted to the ring gear wheel lower cover 202b is the roller chain 202e between the center core bracket 204b and the four-sided ring gear ring fixing bracket 204c It is according to the rotation of the ring gear wheel drive spur flange 203, which is tooth-coupled in the east-west and north-south directions by two, respectively, and the ring gear wheel drive spur flange 203 is a ground excavation modular (100) as shown in FIGS. 1 to 3 It is rotated forward and backward by the auger drive unit 3 and the hydraulic swivel 4 provided on the upper shaft of ).

The ring gear wheel drive spur flange 203, as shown in Figs. 1 to 8 and detailed Fig. 9,

A gear wheel guide door wheel 203b is formed in the middle of the outer cylinder of the ring gear wheel drive spur flange 203, and a ring gear wheel drive gear 203a is formed on the intermediate flange 203c formed on the outer periphery of a certain upper layer of the gear wheel guide door wheel 203b is formed by fitting.

The ring gear wheel drive spur flange 203 formed as described above is located inside the roller chain 202e between the ring gear wheel fixing brackets 204c on all sides of the center core bracket 204b according to the present invention. Referring to FIGS. 4 to 9 as a supplementary description of the inversion arrangement,

As shown in the figure, the two ring gear wheel drive spur flanges 203 arranged in the north-south direction are as shown in FIG. It is engaged with the ring 202, but the ring gear wheel guide door wheel 203b guides the ring gear wheel 202 formed on the lower side of the diameter expansion bit module 200, and two ring gear wheel drive spur flanges arranged in the east-west direction ( 203) is coupled with the two-type ring gear wheel drive spur flange 203 arranged in the north-south direction in a vertical inversion arrangement.

As described above, a two-stage telescoping type fixed vertically to the lower surface of the ring gear wheel lower cover 202b of the ring gear wheel 202 coupled to the upper and lower sides of the diameter expansion bit module 200 at a predetermined distance according to the present invention. The operation of idling the expansion bit expansion unit 201 in the forward or reverse direction in a mutually fixed state at an angle of 45 degrees is performed by the auger drive unit 3 and the hydraulic swivel 4 provided on the upper shaft of the ground excavation modular 100 ) to operate the rotational direction of the four-axis square tube telescopic auger rods (100a) arranged in the east-west group and the north-south group.

As described above, the rotation direction of the upper and lower diameter expansion bit expansion parts 201 fixed to the ring gear wheel lower cover 202b of the ring gear wheel 202 coupled to the upper and lower sides of the diameter expansion bit module 200 at a predetermined distance is forward or reverse. will be driven selectively.

As shown in FIG. 1 according to the present invention, a ground excavation modular 100 in which a 4-axis square tube expansion auger rod 100a and a center core square tube expansion guide 100b are connected and assembled in multi-stage; The assembly and installation process between the excavation bit modules 300 composed of the agitation blades 300b on the upper layer and the auger head 300c excavating the ground on the lower layer of the excavation bit rod 300a, which is normally connected to the lower end of the excavation rod module, is as follows: same.

As shown in FIGS. 1 and 3 to 5, the upper side of the ring gear wheel center core cradle 204 and the ring gear wheel center core flange 204a of the deep ground excavator expansion bit module 200 for multi-axis auger is a ground excavation module ( 100) is fitted to the bottom of the center core square tube expansion guide (100b), and is coupled to the guide inner tube end flange (6) below the ring gear wheel center core flange (204a), and a 3-way mortar flanger (5) is installed at the bottom thereof. And, the exterior is protected by a protective housing (5a), and the discharge hole 1 of the 3-way mortar plunger (5) is a mortar swivel (7) fitted to each lower end of the 4-axis angle tube expansion auger rod (100a), The discharge hole 2 is opened to the adjacent part of the 3-way mortar plunger 5, and the 4-axis excavation bit module 300 is fastened to the Mortar Schwiebel 7 fitted to the lower end of the 4-axis angle tube expansion auger rod 100a. It is to operate the deep ground excavator for multi-axis auger to excavate the deep ground.

In detail, the cement slurry passage traditionally built in the center of the connecting rod and the excavation rod, in the present invention, the high pressure hose reel for cement slurry and the high pressure hose (not shown) disposed on the upper layer inside the center core square tube expansion guide (100b) Through this, the cement slurry is supplied to the three-way mortar plunger 5 of the deep bottom, and the hydraulic hose for controlling the three-way mortar plunger of the deep bottom is internalized, thereby strengthening the rigidity of the connecting rod and reducing the weight.

As described above, while the cement slurry supplied to the core bottom of the drilling bit module 300 at the bottom through the diameter expansion bit module 200 according to the present invention is simultaneously supplied, the auger head 300c is stirred while excavation is in progress. The wing 300b stirs the cement sludge, and at the same time expands the cement sludge with a larger diameter than the single column diameter by the auger head 300c according to the expansion and contraction operation of the expansion and contraction unit 201 of the expansion bit module 200. The agitation of is also made to proceed simultaneously.

In this way, the diameter expansion and contraction unit 201 of the diameter expansion bit module 200 according to the present invention provides the same effect as allowing long construction to be performed immediately after single column construction in the auger head 300c, It is a useful invention that allows the construction of many improved bodies in a short working time by applying the characteristics of the DCM method in various ways such as T-shape, O-shape, and Y-shape.

100: ground excavation modular 100a: 4-axis square tube telescopic auger rod
100b: center core square pipe extension guide
200: expansion bit module
201: expansion bit expansion unit 201a: expansion bit square tube rod
201b: expansion bit square tube
202: ring gear wheel 202a: ring gear wheel upper shaft cover
202b: ring gear wheel lower cover 202c: chain setting ring bracket
202d: steel ball 202d': steel ball hole
202e: roller chain
202f: chain pin 202f': chain pin ball
202g: lip packing
202h: O-ring
203: ring gear wheel drive spur flange 203a: ring gear wheel drive gear
203b: ring gear wheel guide door 203c: intermediate flange
204: ring gear wheel center core cradle
204a: ring gear wheel center core flange 204b: center core bracket
204c: ring gear ring fixing bracket
300: excavation bit module 300a: excavation bit rod
300b: stirring blade 300c: auger head
1: crawler crane 2: leader
3: Auger drive unit 4: Hydraulic Schwiebel
5: 3-way mortar plunger 5a: protective enclosure
6: guide tube end flange 7: Mortar Schwiebel

Claims (4)

The two-stage telescoping-type diameter expansion bit expansion unit 201 composed of the expansion bit square pipe rod 201a and the expansion bit square tube 201b is arranged at an angle of 45 degrees from the front and rear surfaces of the ring gear wheel 202 arranged in correspondence with the vertical spacing. A ring gear ring center core cradle flange 204a having flanges formed in the upper and lower portions, which are fixed at an equal angle; " "With the center core bracket (204b) of the older brother; At the 4-way end of the center core bracket (204b) " "The front and rear surfaces of each T end of the ring gear ring fixing bracket (204c) of the ring gear ring center core cradle (204) consisting of ring gear ring fixing brackets (204c) whose upper and lower middle surfaces are reinforced with ribs and whose T ends are spaced apart It is fixed to the rim of the ring gear wheel 202, and the inside of the roller chain 202e between the ring gear ring fixing brackets 204c on all sides of the center core bracket 204b is a ring gear in a vertical symmetry by two equations each in the east-west and north-south directions A multi-shaft auger deep-low excavator bit modular system, characterized in that the wheel drive spur flange 203 is arranged and coupled. The ring gear ring (202) according to claim 1, wherein the ring gear ring (202) includes: a ring gear ring upper cover (202a) formed with a steel ball semi-groove 1 (202a') formed on an inner vertical portion of a "L"-shaped ring cross section; and the ring gear ring upper cover A chain pin hole 1 (202f') is inscribed with (202a) but protrudes from the center, and an O-ring 1 (202h) and a lip packing (202g) buried portion are provided on the upper surface in contact with the inside, and a steel ball is provided on the inner wall that is inscribed A chain setting ring bracket 202c in which half groove 2 (202c') is formed is formed, but the steel ball half groove 1 (202a') and the steel ball half groove 2 (202c') are formed with a steel ball hole on the outer side of the ring gear ring upper cover (202a). After filling the steel ball 202d with (202d'), close the hole,
One end of the roller chain 202e is fastened with the chain pin 202f to the chain pin hole 202f' of the ring edge protruding from the center of the chain setting ring bracket 202c, and the other end has the same outer diameter as the upper ring of the ring gear It is fastened to the chain pin hole 2 (202b') corresponding to the chain pin hole 1, and the contact surface with the chain setting ring bracket (202c) is integrally fixed,
The ring gear wheel upper cover (202a) and the ring gear wheel lower cover (202b) in which an O-ring 2 (202h') embedded portion is formed on the contact surface. The ring gear wheel drive spur flange 203 has a gear wheel guide door roller 203b formed in the middle of the outer cylinder, and a ring on an intermediate flange 203c formed on a certain upper outer periphery of the gear wheel guide door roller 203b. Deep-sea excavator for multi-shaft augers, characterized in that the gear wheel drive gear (203a) is formed as a fitting. According to claims 1 and 3, the ring gear wheel driving gear (203a) of the ring gear wheel driving spur flange 203 is engaged with the ring gear wheel 202 formed on the upper side of the diameter expansion bit module 200, and the ring gear wheel guide The door roller 203b guides the ring gear wheel 202 formed on the lower side of the diameter expansion bit module 200, and the two ring gear wheel drive spur flanges 203 arranged in the east-west direction are the two types arranged in the north-south direction. Deep ground excavator expansion bit modular system for multi-axis augers, characterized in that the ring gear wheel drive spur flange (203) is coupled with a vertical inversion arrangement.