阅读说明：本技术 一种smw工法桩的h型钢安装导向装置 (H-shaped steel installation guiding device of SMW construction method pile ) 是由 王涛 刘鹏 叶锦华 张文杰 赵晓策 王兴宝 张建恪 王博 刘伟 于 2020-05-06 设计创作，主要内容包括：本发明型公开了一种SMW工法桩的H型钢安装导向装置,其涉及H型钢施工领域,旨在解决现有导向装置适用的H型钢规格范围小的问题,导向装置包括底座、设置在底座上表面的导向桩以及贯穿设置在导向桩上表面并向下贯穿底座的导向通道,导向通道的一相对侧壁上贯穿设置有第一滑槽,导向通道的另一相对侧壁上贯穿设置有第二滑槽,第一滑槽槽壁上沿水平方向滑移设置有第一调节杆,第二滑槽槽壁上滑移设置有第二调节杆,第一调节杆的一端转动设置有第一抵辊,第二调节杆的一端转动设置有第二抵辊,导向桩上设置有用于滑移第一调节杆和第二调节杆的调节组件。本发明可以对不同规格大小的H型钢进行导向,减少H型钢下放至搅拌桩体过程中的偏移。(The invention discloses an H-shaped steel installation guiding device of an SMW construction method pile, which relates to the field of H-shaped steel construction and aims to solve the problem that the specification range of H-shaped steel suitable for the existing guiding device is small. The invention can guide the H-shaped steel with different specifications and sizes and reduce the deflection of the H-shaped steel in the process of lowering the H-shaped steel to the stirring pile body.)

1. The utility model provides a H shaped steel installation guider of SMW worker method stake, includes base (1), sets up guide pile (2) at base (1) upper surface and runs through setting up at guide pile (2) upper surface and downwards run through guide way (3) of base (1), its characterized in that: a first sliding groove (4) is arranged on one opposite side wall of the guide channel (3) in a penetrating manner, a second sliding groove (5) is arranged on the other opposite side wall of the guide channel (3) in a penetrating manner, a first adjusting rod (41) is arranged on the groove wall of the first sliding groove (4) in a sliding manner along the horizontal direction, a second adjusting rod (51) is arranged on the groove wall of the second sliding groove (5) in a sliding manner along the horizontal direction, a first supporting roller (42) is arranged at one end, extending into the guide channel (3), of the first adjusting rod (41) in a rotating manner through a first support (411), a second supporting roller (52) is arranged at one end, extending into the guide channel (3), of the second adjusting rod (51) in a rotating manner through a second support (511), the first supporting roller (42) and the second supporting roller (52) are horizontal in axis, the first supporting roller (42) and the second supporting roller (52) are abutted against the opposite parallel plates of the H-shaped steel, and the second supporting roller (52, the guide pile (2) is provided with an adjusting component (6) used for sliding the first adjusting rod (41) and the second adjusting rod (51).

2. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: the adjusting assembly (6) comprises a first adjusting ring (61), a second adjusting ring (62), a first adjusting thread (63) and a second adjusting thread (64), the first adjusting thread (63) is arranged on the peripheral wall of the first adjusting rod (41) far away from the first supporting roller (42), the second adjusting thread (64) is arranged on the peripheral wall of the second adjusting rod (51) far away from the second supporting roller (52), the first adjusting ring (61) is rotatably arranged on the outer side wall of the guide pile (2), the inner annular wall of the first adjusting ring (61) is in threaded connection with the first adjusting thread (63), the second adjusting ring (62) is rotatably arranged on the outer side wall of the guide pile (2), and the inner side wall of the second adjusting ring (62) is in threaded connection with the second adjusting thread (64).

3. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: the top of guide pile (2) is provided with leading-in fill (7), be provided with direction base section of thick bamboo (71) on the inside wall of leading-in fill (7), direction base section of thick bamboo (71) and first roller (42) and the second of supporting are supported roller (52) one-to-one setting, the internal slipping of direction base section of thick bamboo (71) is provided with direction slide bar (72), be provided with buffer spring (73) between the one end that direction base section of thick bamboo (71) was stretched into in direction slide bar (72) and direction base section of thick bamboo (71) lateral wall, the one end that direction base section of thick bamboo (71) was stretched out in direction slide bar (72) is provided with the direction and supports head (74).

4. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: a first guide inclined plate (412) is arranged at the top end of the first bracket (411), one end, facing the inner side of the guide channel (3), of the first guide inclined plate (412) is inclined downwards, and the bottom end of the first guide inclined plate (412) is opposite to one side, close to the inner side of the guide channel (3), of the first resisting roller (42) in the vertical direction; the top end of the second support (511) is provided with a second guide inclined plate (512), the second guide inclined plate (512) inclines downwards towards the inner side of the guide channel (3), and the bottom end of the second guide inclined plate (512) is opposite to the inner side of the guide channel (3) close to the second support roller (52) in the vertical direction.

5. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: a first guide groove (413) extending along the horizontal direction is formed in the peripheral wall of the first adjusting rod (41) extending into the guide channel (3), one end, far away from the first resisting roller (42), of the first support (411) is arranged in the first guide groove (413) in a sliding mode, and a first damping spring (414) is arranged between the first guide groove (413) and the side wall, opposite to the first support (411) in the length direction of the first adjusting rod (41); the peripheral wall of the second adjusting rod (51) extending into the guide channel (3) is provided with a second guide groove (513) extending along the horizontal direction, one end, far away from the second supporting roller (52), of the second support (511) is arranged in the second guide groove (513) in a sliding mode, and a second damping spring (514) is arranged between the second guide groove (513) and the side wall, opposite to the second support (511) in the length direction, of the second adjusting rod (51).

6. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: the four corners of the lower surface of the base (1) are concavely provided with sliding containing grooves (11), the groove walls of the sliding containing grooves (11) are provided with supporting legs (111) in a sliding manner along the vertical direction, the bottom ends of the supporting legs (111) are provided with traveling wheels (112), the groove walls of the sliding containing grooves (11) are provided with supporting chutes (113) penetrating through the base (1), and the groove walls of the supporting chutes (113) are provided with supporting blocks (114) in a sliding manner along the horizontal direction; when the supporting block (114) extends into the sliding containing groove (11), one end of the supporting block (114) extending into the sliding containing groove (11) is abutted against the top end of the supporting leg (111), and the travelling wheel (112) extends out of the sliding containing groove (11); when the supporting block (114) is far away from the sliding containing groove (11), the travelling wheel (112) is retracted into the sliding containing groove (11).

7. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: the base (1) is provided with at least two lifting through grooves (12) in a penetrating manner along the vertical direction, lifting rods (121) penetrate through the lifting through grooves (12), spiral guide grooves (122) are concavely formed in the circumferential groove walls of the lifting through grooves (12), two guide wheels (123) are rotatably arranged on the circumferential walls of the lifting rods (121), the guide wheels (123) are arranged in the spiral guide grooves (122) in a rolling manner, and fixing screws (124) are arranged at the bottom ends of the lifting rods (121); when the guide wheel (123) is positioned at the top end of the spiral guide groove (122), the fixing screw (124) is positioned in the lifting through groove (12), and the top end of the lifting rod (121) extends out of the lifting through groove (12).

8. The H-section steel installation guide device of the SMW method pile according to claim 1, wherein: a retraction chute (31) is arranged at the bottom end of the opposite side wall of the guide channel (3) along the horizontal direction, a pre-support plate (32) is arranged on the bottom wall of the retraction chute (31) in a sliding manner along the horizontal direction, and a plurality of rolling balls (33) are rotatably arranged at the top end of the pre-support plate (32); when the pre-supporting plate (32) and the rolling ball (33) are retracted into the retraction chute (31), the H-shaped steel passes through the guide channel (3); when the pre-supporting plate (32) extends out of the retracting chute (31), the H-shaped steel is abutted against the upper surface of the pre-supporting plate (32); the base (1) is provided with a retractable part (34) of a sliding pre-supporting plate (32).

9. The H-section steel installation guide device of the SMW method pile as claimed in claim 8, wherein: the retractable part (34) comprises a pulling plate (341), a shifting plate (342) and a clamping head (343), one end of the retractable chute (31) far away from the guide channel (3) penetrates through the base (1), the pulling plate (341) is fixedly arranged at one end of the pre-supporting plate (32) far away from the guide channel (3), the shifting plate (342) is rotatably arranged at one end of the pulling plate (341) far away from the pre-supporting plate (32), the rotating axis of the shifting plate (342) is horizontal and perpendicular to the length direction of the pulling plate (341), the clamping head (343) is arranged at one end of the shifting plate (342) far away from the pulling plate (341), and a clamping groove (345) is concavely arranged on the outer side wall of the base (1); when in the fagging (32) is received and release spout (31) in advance, transposition board (342) stretch out the groove of holding that slides and rotate to laminating with base (1) lateral wall, dop (343) and draw-in groove (345) joint.

Technical Field

The invention relates to the field of H-shaped steel construction, in particular to an H-shaped steel installation guide device for an SMW construction method pile.

Background

The SMW construction method is also called as a novel cement soil mixing pile wall, and is characterized in that a drill bit is used for cutting a soil body on site, cement slurry is injected into the soil body at the end part of the drill bit, after the soil body is fully mixed, overlapping construction is adopted among construction units, H-shaped steel or other sectional materials are inserted into a mixing pile body before a cement soil mixture is not hardened, so that a continuous, complete and seamless underground continuous wall body with certain strength and rigidity is formed, and the wall body can be used as a soil blocking and water stopping structure of an underground excavation foundation pit; and when the H shaped steel is transferred, the vertical transfer of the H shaped steel is required to be ensured as far as possible, so that the H shaped steel is required to be guided.

The prior application number is CN201721082872.2, and the prior application number discloses a fixing frame device for piles in an SMW construction method, which comprises a guide wall, a fixing channel, a support frame, a fixing frame and a roller, wherein a brake is further arranged on the roller, in the construction process of H-shaped steel, a crawler crane lifts the H-shaped steel, the H-shaped steel is slowly put down at the upper end of the fixing frame device for the piles in the SMW construction method, the H-shaped steel is guided into the fixing channel through the sliding friction of the guide wall, then the H-shaped steel enters a mixing pile body, after the H-shaped steel is put in, the braking effect of a brake 51 is relieved, the fixing frame device for the piles in the SMW construction method is moved to the next position where the H-shaped steel needs to be inserted, the brake is stepped.

However, the above patent only guides H-shaped steel of a single specification because the size of the guide passage is fixed, and the assembling efficiency of the fixing frame of the SMW-process pile is lowered.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an H-shaped steel installation guide device for an SMW construction method pile, which can guide H-shaped steels with different specifications and sizes so that the H-shaped steels are vertically lowered to a stirring pile body.

In order to achieve the purpose, the invention provides the following technical scheme:

an H-shaped steel installation guiding device of an SMW construction method pile comprises a base, a guide pile arranged on the upper surface of the base and a guide channel penetrating the upper surface of the guide pile and downwards penetrating the base, wherein a first sliding groove penetrates through one opposite side wall of the guide channel, a second sliding groove penetrates through the other opposite side wall of the guide channel, a first adjusting rod is arranged on the groove wall of the first sliding groove in a sliding mode along the horizontal direction, a second adjusting rod is arranged on the groove wall of the second sliding groove in a sliding mode along the horizontal direction, a first abutting roller is arranged at one end, extending into the guide channel, of the first adjusting rod in a rotating mode through a first support, a second abutting roller is arranged at one end, extending into the guide channel, of the second adjusting rod in a rotating mode through a second support, the axial lines of the first abutting roller and the second abutting roller are horizontal, and the first abutting roller is abutted against the opposite sides of two parallel, the second is supported roller and H shaped steel and is connected in the inboard wall both sides butt of two parallel plates, be provided with the adjusting part that is used for sliding first regulation pole and second regulation pole on the guide pile.

By adopting the technical scheme, the H-shaped steel is hung into the guide channel from top to bottom, and the first resisting roller and the second resisting roller are abutted against the peripheral side wall of the H-shaped steel in the downward moving process of the H-shaped steel, so that the H-shaped steel can be guided, and the H-shaped steel can be smoothly and vertically lowered to the stirring pile body; meanwhile, for H-shaped steel with different specifications and sizes, the first adjusting rod and the second adjusting rod can respectively slide in the first sliding groove and the second sliding groove through the adjusting assembly, so that the distance between the two first resisting rollers and the distance between the two second resisting rollers are relatively adjusted, the size of the guide space of the guide channel is adjusted, and the H-shaped steel guiding device can be suitable for guiding the H-shaped steel with different specifications and sizes.

The adjusting assembly comprises a first adjusting ring, a second adjusting ring, a first adjusting thread and a second adjusting thread, the first adjusting thread is arranged on the peripheral wall, far away from the first resisting roller, of the first adjusting rod, the second adjusting thread is arranged on the peripheral wall, far away from the second resisting roller, of the second adjusting rod, the first adjusting ring is rotatably arranged on the outer side wall of the guide pile, the inner ring wall of the first adjusting ring is in threaded connection with the first adjusting thread, the second adjusting ring is rotatably arranged on the outer side wall of the guide pile, and the inner side wall of the second adjusting ring is in threaded connection with the second adjusting thread.

By adopting the technical scheme, the first adjusting rod slides in the first sliding groove along the horizontal direction, so that when the first adjusting ring is rotated, the first adjusting ring and the first adjusting thread rotate in a threaded manner, and the first adjusting rod can be promoted to slide in the first sliding groove; because the second adjusting rod slides in the second sliding groove along the horizontal direction, when the second adjusting ring is rotated, the second adjusting ring and the second adjusting thread rotate in a threaded manner, and therefore the second adjusting rod can be promoted to slide in the second sliding groove.

The invention is further arranged in such a way that a guide hopper is arranged at the top end of the guide pile, a guide base cylinder is arranged on the inner side wall of the guide hopper, the guide base cylinder is arranged in one-to-one correspondence with the first supporting roller and the second supporting roller, a guide slide bar is arranged in the guide base cylinder in a sliding way, a buffer spring is arranged between one end of the guide slide bar, which extends into the guide base cylinder, and the side wall of the guide base cylinder, and a guide supporting head is arranged at one end of the guide slide bar, which extends out of the guide base cylinder.

By adopting the technical scheme, the H-shaped steel is guided to the upper part of the guide channel by the guide hopper, so that the H-shaped steel can conveniently enter the guide channel, and meanwhile, when the H-shaped steel enters the guide hopper, the H-shaped steel can be abutted against the guide abutting head, so that the H-shaped steel smoothly enters the guide channel under the guide of the guide abutting head; and support the in-process of first butt at H shaped steel and direction, buffer spring takes place elastic deformation, and the direction slide bar slides in the direction base section of thick bamboo to the effort that acts on leading-in fill to H shaped steel cushions, also offsets the effort that rocks of H shaped steel simultaneously, makes H shaped steel steadily enter into the direction passageway.

The invention is further provided that the top end of the first bracket is provided with a first guide inclined plate, the first guide inclined plate inclines downwards towards the first end of the inner side of the guide channel, and the bottom end of the first guide inclined plate is opposite to one side of the first resisting roller close to the inner side of the guide channel in the vertical direction; the top end of the second support is provided with a second guide inclined plate, the second guide inclined plate inclines downwards towards the first end of the inner side of the guide channel, and the bottom end of the second guide inclined plate is opposite to one side, close to the inner side of the guide channel, of the second support roller in the vertical direction.

Through taking above-mentioned technical scheme, after H shaped steel gets into the direction passageway top, H shaped steel at first contacts first direction swash plate and second direction swash plate, first direction swash plate and second direction swash plate can lead to H shaped steel, make H shaped steel get into smoothly two first rollers and two seconds are supported between the roller, when improving H shaped steel whereabouts stability, first direction swash plate and second direction swash plate support the roller at first top formation protection that supports the roller with the second respectively, reduce the collision damage that H shaped steel supported the roller to first roller and second.

The invention is further provided that a first guide groove extending along the horizontal direction is arranged on the peripheral wall of the first adjusting rod extending into the guide channel, one end of the first support far away from the first supporting roller is arranged in the first guide groove in a sliding manner, and a first damping spring is arranged between the first guide groove and the side wall of the first support opposite to the first adjusting rod along the length direction; the peripheral wall of the second adjusting rod extending into the guide channel is provided with a second guide groove extending along the horizontal direction, one end, far away from the second supporting roller, of the second support is arranged in the second guide groove in a sliding mode, and a second damping spring is arranged between the second guide groove and the side wall, opposite to the second adjusting rod, of the second support in the length direction.

Through adopting above-mentioned technical scheme, when first roller and the second is supported and is supported on the H shaped steel lateral wall, in the whereabouts in-process of H shaped steel, the effort that H shaped steel counteracts on first roller and the second is supported the roller can be passed through on first damping spring and the second damping spring, thereby can cushion the effort that H shaped steel counteracts on first roller and the second is supported the roller, reduce first roller and the second and support the stress that receives, thereby reduce first roller and the second and support the damage of roller and first support and second support, increase first roller and the second and support the life who supports roller and first support and second support.

The invention is further provided with a sliding containing groove which is concavely arranged at four corners of the lower surface of the base, a supporting leg is arranged on the groove wall of the sliding containing groove in a sliding manner along the vertical direction, a travelling wheel is arranged at the bottom end of the supporting leg, a supporting sliding groove penetrating through the base is arranged on the groove wall of the sliding containing groove, and a supporting block is arranged on the groove wall of the supporting sliding groove in a sliding manner along the horizontal direction; when the supporting block extends into the sliding containing groove, one end of the supporting block extending into the sliding containing groove is abutted against the top end of the supporting leg, and the travelling wheel extends out of the sliding containing groove; when the supporting block is far away from the sliding containing groove, the travelling wheels are retracted into the sliding containing groove.

By adopting the technical scheme, when the guide device needs to be moved, the base is slightly lifted up to be far away from the ground, the travelling wheels can fall out of the sliding containing grooves under the action of self gravity, and then the supporting blocks are inserted into the sliding containing grooves, so that the travelling wheels can be stably fixed on the outer side of the base, and the movement of the base is facilitated; and when guider carries out the direction work, take out the supporting shoe and slide and hold the groove, the base moves down under self action of gravity to the travelling wheel is received and is slided and hold in the groove, thereby the butt contact ground can improve guider's stability of sitting.

The invention is further arranged in that the base is provided with at least two lifting through grooves in a penetrating manner along the vertical direction, lifting rods penetrate through the lifting through grooves, spiral guide grooves are concavely arranged on the circumferential groove walls of the lifting through grooves, two guide wheels are rotatably arranged on the circumferential wall of each lifting rod, the guide wheels are arranged in the spiral guide grooves in a rolling manner, and the bottom ends of the lifting rods are provided with fixing screws; when the guide wheel is positioned at the top end of the spiral guide groove, the fixing screw is positioned in the lifting through groove, and the top end of the lifting rod extends out of the lifting through groove.

Through adopting above-mentioned technical scheme, when pushing down or shifting up the lifter, because vertical effort and slope effort can be decomposed out to the effort of leading wheel to the spiral guide way, consequently, the leading wheel can remove along the helical direction of spiral guide way, thereby can arouse to go up and down in the ascending slip of vertical side and the ascending rotation of circumferencial direction, make set screw can screw-rotate and to drive underground or extract ground, thereby can fix a position or release the base, when not influencing the base and remove, when guider leads the work, can guarantee the stability of base, reduce the removal of base and reduce the influence to H shaped steel direction stability.

The invention is further provided with a retraction chute arranged at the bottom end of the opposite side wall of the guide channel along the horizontal direction, a pre-support plate is arranged on the bottom wall of the retraction chute in a sliding manner along the horizontal direction, and a plurality of rolling balls are rotatably arranged at the top end of the pre-support plate; when the pre-supporting plate and the rolling ball are retracted into the retraction chute, the H-shaped steel passes through the guide channel; when the pre-supporting plate extends out of the retracting chute, the H-shaped steel is abutted against the upper surface of the pre-supporting plate; the base is provided with a retractable part of a sliding pre-supporting plate.

By adopting the technical scheme, due to misoperation, the first resisting roller and the second resisting roller can not be abutted against the side wall of the H-shaped steel right, so that the first resisting roller and the second resisting roller can be moved to the position slightly far away from the guide space of the guide channel when the H-shaped steel is placed; at the moment, the H-shaped steel is placed into the guide channel and then is located on the pre-supporting plate, and then the positions of the first supporting roller and the second supporting roller are adjusted, so that the H-shaped steel is limited to a specified position by the first supporting roller and the second supporting roller; then the pre-supporting plates are retracted into the retraction sliding grooves by utilizing the retraction parts, the H-shaped steel is continuously lowered, and the guiding can be carried out in the process that the H-shaped steel enters the stirring pile body.

The retractable part comprises a pulling plate, a position changing plate and a clamping head, one end of the retractable chute, which is far away from the guide channel, penetrates through the base, the pulling plate is fixedly arranged at one end, which is far away from the guide channel, of the pre-supporting plate, the position changing plate is rotatably arranged at one end, which is far away from the pre-supporting plate, of the pulling plate, the rotating axis of the position changing plate is horizontal and vertical to the length direction of the pulling plate, the clamping head is arranged at one end, which is far away from the pulling plate, of the position changing plate, and a clamping groove is concavely arranged on the outer side wall; when the pre-supporting plate is retracted into the retraction sliding groove, the shifting plate extends out of the sliding accommodating groove and rotates to be attached to the outer side wall of the base, and the clamping head is clamped with the clamping groove.

By adopting the technical scheme, the shifting plate is pulled, and the pre-supporting plate can be driven to move through the pulling plate; meanwhile, after the supporting plate is retracted into the retraction sliding groove in advance, the shifting plate is rotated, the clamping head and the clamping groove are clamped, the shifting plate and the pulling plate can be fixed, and therefore the supporting plate is stably retracted into the retraction sliding groove in advance, and the lowering of the H-shaped steel cannot be influenced.

In conclusion, the invention has the following beneficial effects:

1. the first adjusting rod and the second adjusting rod respectively slide in the first sliding chute and the second sliding chute by utilizing the adjusting assembly, so that the distance between the two first supporting rollers and the distance between the two second supporting rollers are relatively adjusted, the size of the guide space of the guide channel is adjusted, and the H-shaped steel guide device can be suitable for guiding H-shaped steel with different specifications and sizes;

2. the lifting fixing screw is arranged, so that the base can be stably fixed on the ground when the guide device works, and the guide stability of the guide device is improved;

3. the pre-supporting plate capable of sliding is arranged, so that the H-shaped steel can be located on the pre-supporting plate in the guide channel, the first supporting roller and the second supporting roller are submitted to be supported on the side wall of the H-shaped steel, a moving offset space can be provided for the H-shaped steel when the H-shaped steel is placed in the guide channel, and the operation difficulty is reduced while the placement guide result of the H-shaped steel is not influenced.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a sectional view of a first roller structure embodying the present invention.

FIG. 3 is a schematic view of a first damping spring structure embodying the present invention.

FIG. 4 is a schematic view of a second damping spring structure embodying the present invention.

FIG. 5 is a cross-sectional view of a second roller structure embodying the present invention.

Fig. 6 is a partial cross-sectional view of a traveling wheel structure embodying the present invention.

Reference numerals: 1. a base; 11. a sliding containing groove; 111. a support leg; 112. a traveling wheel; 113. a support chute; 114. a support block; 12. a lifting through groove; 121. a lifting rod; 122. a spiral guide groove; 123. a guide wheel; 124. a set screw; 125. a pull ring; 2. a guide pile; 3. a guide channel; 31. a retraction chute; 32. pre-supporting plates; 33. rolling a ball; 34. a retractable member; 341. pulling a plate; 342. a transposition board; 343. clamping a head; 345. a card slot; 4. a first chute; 41. a first adjusting lever; 411. a first bracket; 412. a first inclined guide plate; 413. a first guide groove; 414. a first damping spring; 42. a first resisting roller; 5. a second chute; 51. a second adjusting lever; 511. a second bracket; 512. a second inclined guide plate; 513. a second guide groove; 514. a second damping spring; 52. a second resist roller; 6. an adjustment assembly; 61. a first adjusting ring; 62. a second adjusting ring; 63. a first adjusting screw thread; 64. a second adjusting screw thread; 7. a lead-in hopper; 71. a guiding base cylinder; 72. a guide slide bar; 73. a buffer spring; 74. and guiding the abutting head.

Detailed Description

The invention will be described in further detail with reference to the accompanying drawings.