CN217445000U - Buckle-mounted MPP honeycomb pipe joint - Google Patents

Abstract

The utility model relates to a spiral-lock formula MPP honeycomb coupling, its characteristics lie in including locating piece, spiral-lock piece, wherein seted up location breach on the locating piece, make a bet and glue the ring groove, seted up spiral-lock breach on the spiral-lock piece, go up the injection ring groove, spiral-lock piece spiral-lock is on the locating piece, and spiral-lock breach and location breach enclose jointly and have formed with honeycomb duct appearance assorted locating hole. The utility model discloses a locating piece, the spiral-lock formula structure that spiral-lock piece becomes, and at the locating piece, the injecting glue annular has still been seted up down on the spiral-lock piece respectively, go up the injecting glue annular, this can not only be convenient for realize bonding fixedly, can also play totally enclosed effect, very firm in order to guarantee the butt joint of honeycomb pipe, the leakproofness is good, thereby can avoid water to enter into in the honeycomb pipe from the butt joint department of honeycomb pipe, accelerate in order to avoid the inside cable ageing speed of honeycomb pipe, and then can play extension cable life's purpose, this MPP honeycomb pipe connects's reliability and suitability are all very good.

Description

Buckle-mounted MPP honeycomb pipe joint

Technical Field

The utility model relates to a cable duct technical field that docks, especially a honeycomb coupling.

Background

Currently, to butt-joint two honeycomb pipes, the two honeycomb pipes are butt-jointed by tightly sleeving the ends of the two honeycomb pipes with a sleeve pipe. Although the socket pipe and the honeycomb pipe are tightly matched, when the butt joint part is buried under the ground, the socket pipe and the honeycomb pipe are easily extruded by soil to deform, and in addition, the honeycomb pipe and the socket pipe are difficult to avoid, so that processing errors exist, and the appearance structure of the honeycomb pipe is relatively complex. Therefore, after the butt joint is completed and when the butt joint is buried under the ground, gaps are inevitably formed at the butt joint, so that the sealing performance of the butt joint is poor, a good waterproof effect cannot be achieved, and underground water easily enters the honeycomb tube along the gaps at the butt joint. And the entering of water easily leads to the acceleration of the aging speed of the cable in the honeycomb tube, thereby easily causing the shortening of the service life of the cable.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the above-mentioned problem and not enough, the utility model provides a spiral-lock formula MPP honeycomb pipe connects, this spiral-lock formula MPP honeycomb pipe connects has adopted the locating piece, the spiral-lock formula structure that spiral-lock block group becomes, and at the locating piece, still seted up down the injecting glue annular on the spiral-lock piece respectively, go up the injecting glue annular groove, this can not only be convenient for realize bonding fixedly, can also play totally enclosed effect, it is very firm to guarantee the butt joint of honeycomb duct, the leakproofness is good, thereby can avoid water to enter into in the honeycomb duct from the butt joint department of honeycomb duct, accelerate with the inside cable ageing speed of avoiding the honeycomb duct, and then can play extension cable life's purpose, this MPP honeycomb pipe connects's reliability and suitability are all very good.

The technical scheme of the utility model is realized like this:

the utility model provides a spiral-lock formula MPP honeycomb coupling, its characteristics lie in including locating piece, spiral-lock piece, wherein seted up location breach on the top surface of locating piece, still set up the lower injecting glue annular that spanes location breach on the top surface of locating piece to make the middle part of injecting glue annular be located the oroWALL of location breach down, spiral-lock breach has been seted up on the bottom surface of spiral-lock piece, still set up the last injecting glue annular that spanes spiral-lock breach on the bottom surface of spiral-lock piece to make the middle part of going up the injecting glue annular be located the oroWALL of spiral-lock breach, spiral-lock piece spiral-lock is on the locating piece, and make spiral-lock breach and location breach be mutual disposition, still make and go up the injecting glue annular and be mutual disposition with lower injecting glue annular, spiral-lock breach and location breach enclose jointly and form with honeycomb outside of tubes shape assorted locating hole.

Preferably, the top surface of the positioning block is provided with a plurality of limiting convex columns, the bottom surface of the buckling block is provided with a plurality of limiting holes, and the limiting holes are respectively sleeved on the limiting convex columns.

Preferably, the lower glue injection ring groove comprises a lower glue storage ring groove and a plurality of glue injection grooves, the lower glue storage ring groove stretches across the positioning notch, the middle part of the lower glue storage ring groove is located on the opening wall of the positioning notch, the glue injection grooves are respectively arranged on two sides of the opening of the positioning notch, one end of each glue injection groove is communicated with the lower glue storage ring groove, and the other end of each glue injection groove penetrates through the corresponding side wall of the positioning block.

Preferably, the number of the glue pouring grooves is 4, two of the glue pouring grooves are located on one side of the positioning notch, and the other two glue pouring grooves are located on the other side of the positioning notch.

Preferably, go up the injecting glue annular including hiding gluey annular, two at least injecting glue holes, a plurality of last injecting glue grooves, it stretches across the spiral-lock breach and sets up to go up to hide gluey annular's middle part and be located the oral wall of spiral-lock breach, each goes up the injecting glue groove and arranges respectively in the notch both sides of spiral-lock breach, and make one end and the last gluey annular groove of hiding of each go up gluey groove communicate, still make the other end of each go up gluey groove run through to on the corresponding lateral wall of spiral-lock piece, the vertical spiral-lock piece that runs through of each injecting glue hole is seted up, and make the lower extreme of each injecting glue hole run through respectively to two sections in the spiral-lock breach in hiding gluey annular.

Preferably, the number of the upper glue injection grooves is 4, two of the upper glue injection grooves are located on one side of the buckling gap, and the other two of the upper glue injection grooves are located on the other side of the buckling gap.

Preferably, the upper orifice of each glue injection hole is in a funnel-shaped structure.

Preferably, a plurality of positioning nails are arranged on the bottom surface of the positioning block.

Preferably, at least two reinforcing blocks are embedded in the positioning block, and the bottom surface of each reinforcing block is connected with the upper ends of at least two positioning nails.

The utility model has the advantages that: the utility model discloses an among the spiral-lock formula MPP honeycomb coupling, the spiral-lock formula structure that locating piece and spiral-lock piece constitute has been adopted, set up the location breach on the locating piece respectively, and span the lower gluey ring groove of location breach, and the middle part of injecting glue annular is located the mouth wall of location breach down, seted up the spiral-lock breach on the spiral-lock piece respectively, and span the last gluey ring groove of spiral-lock breach, and the middle part of going up gluey ring groove is located the mouth wall of spiral-lock breach, in addition location breach and spiral-lock breach enclose jointly to close form with honeycomb tube outward shape assorted locating hole, it is mutual disposition with lower injecting glue annular to go up the injecting glue annular in addition. The ends of the two honeycomb tubes can be positioned by buckling, and the upper glue injection ring groove and the lower glue injection ring groove can be convenient for realizing glue injection. After glue is injected into the upper glue injection ring groove and the lower glue injection ring groove, the contact surfaces of the honeycomb tubes and the positioning blocks and the buckling blocks can be bonded through glue, and the positioning blocks and the buckling blocks can be bonded and fixed through glue, so that the butt joint of the two honeycomb tubes can be well sealed. This spiral-lock formula MPP honeycomb coupling can not only be convenient for realize bonding fixedly, can also play totally enclosed effect to guarantee that the butt joint of honeycomb pipe is very firm, sealed, thereby can avoid water to enter into the honeycomb from the butt joint department of honeycomb pipe intraductally, accelerate with the cable ageing speed of avoiding the honeycomb inside pipe wall, and then can play extension cable life's purpose, this MPP honeycomb coupling's reliability and suitability are all very good. Adopt spiral-lock formula structure, it is still very convenient to use, can be convenient for fast accurate with honeycomb pipe and spiral-lock formula MPP honeycomb coupling butt joint together, this spiral-lock formula MPP honeycomb coupling uses very conveniently. Meanwhile, the overall structure of the buckled MPP honeycomb pipe joint is very simple, and the manufacture is also very convenient.

Drawings

Fig. 1 is the perspective structure schematic diagram of the middle button-mounted MPP honeycomb pipe joint of the present invention.

Fig. 2 is the cross-sectional structure schematic diagram of the middle button-mounted MPP honeycomb pipe joint of the present invention.

Fig. 3 is the utility model discloses well snap-on MPP honeycomb coupling's split structure sketch map.

Fig. 4 is a schematic perspective view of the positioning block of the present invention.

Fig. 5 is a schematic view of a three-dimensional structure of the middle fastening block of the present invention.

Fig. 6 is a schematic view of an assembly structure of the middle positioning block and the honeycomb tube according to the present invention.

Fig. 7 is a schematic structural view of the usage state of the present invention.

Detailed Description

As shown in fig. 1 to 5, the fastening MPP honeycomb pipe joint of the present invention comprises a positioning block 1 and a fastening block 2, wherein the top surface of the positioning block 1 is provided with a positioning gap 11, the top surface of the positioning block 1 is also provided with a lower glue pouring ring groove 12 crossing the positioning gap 11, the middle part of the lower glue injection ring groove 12 is positioned on the opening wall of the positioning gap 11, the bottom surface of the buckling block 2 is provided with a buckling gap 21, the bottom surface of the buckling block 2 is also provided with an upper glue injection ring groove 22 crossing the buckling gap 21, the middle part of the upper glue injection ring groove 22 is positioned on the mouth wall of the buckling gap 21, the buckling block 2 is buckled on the positioning block 1, the buckling gap 21 and the positioning gap 11 are oppositely arranged, the upper glue injection ring groove 22 and the lower glue injection ring groove 12 are oppositely arranged, the buckling notch 21 and the positioning notch 11 jointly enclose to form a positioning hole 10 matched with the shape of the honeycomb tube.

The utility model discloses an among the spiral-lock formula MPP honeycomb coupling, the spiral-lock formula structure that locating piece 1 and spiral-lock piece 2 constitute has been adopted, location breach 11 has been seted up on locating piece 1 respectively, and the lower gluey annular groove 12 of pouring that spanes location breach 11, and the middle part of lower gluey annular groove 12 is located the oral cavity wall of location breach 11, spiral-lock breach 21 has been seted up on spiral-lock piece 2 respectively, and span the last gluey annular groove 22 of last injection of spiral-lock breach 21, and the middle part of going up gluey annular groove 22 is located the oral cavity wall of spiral-lock breach 21, in addition location breach 11 encloses jointly with spiral-lock breach 21 and has formed with honeycomb pipe appearance assorted locating hole 10, it is mutual disposition with lower gluey annular groove 12 to go up injecting glue annular groove 22 in addition. The ends of the two honeycomb tubes can be positioned by buckling, and the upper glue injection ring groove 22 and the lower glue injection ring groove 12 can be used for conveniently injecting glue. After glue is injected into the upper glue injection ring groove 22 and the lower glue injection ring groove 12, the contact surfaces of the honeycomb tubes and the positioning block 1 and the buckling block 2 can be bonded through glue, and the positioning block 1 and the buckling block 2 can be bonded and fixed through glue, so that the butt joint of the two honeycomb tubes can be well sealed. This spiral-lock formula MPP honeycomb coupling can not only be convenient for realize bonding fixedly, can also play totally enclosed effect to guarantee that the butt joint of honeycomb pipe is very firm, sealed, thereby can avoid water to enter into the honeycomb from the butt joint department of honeycomb pipe intraductally, accelerate with the cable ageing speed of avoiding the honeycomb inside pipe wall, and then can play extension cable life's purpose, this MPP honeycomb coupling's reliability and suitability are all very good.

Adopt spiral-lock formula structure, it is still very convenient to use, can be convenient for fast accurate with honeycomb pipe and spiral-lock formula MPP honeycomb coupling butt joint together, this spiral-lock formula MPP honeycomb coupling uses very conveniently.

Meanwhile, the overall structure of the buckled MPP honeycomb pipe joint is very simple, and the manufacture is also very convenient.

As shown in fig. 1, 2, 6 and 7, the positioning hole 10 matches the outer shape of the seven-hole honeycomb tube. Seven hole honeycomb pipes just so can stably be injectd to can satisfy this actual use demand of spiral-lock formula MPP honeycomb coupling well.

As shown in fig. 2 to 5, the top surface of the positioning block 1 is provided with a plurality of limiting convex columns 13, the bottom surface of the fastening block 2 is provided with a plurality of limiting holes 23, and each limiting hole 23 is respectively sleeved on each limiting convex column 13. Therefore, the buckling block 2 can be buckled on the positioning block 1 accurately and quickly, and the convenience of installing and positioning the buckling block 2 is improved. And thus, the function of limiting the buckling block 2 can be achieved, so that the buckling block 2 can be stably arranged on the positioning block 1, and the reliability of the buckling MPP honeycomb pipe joint is further improved.

As shown in fig. 4, the lower glue injection ring groove 12 includes a lower glue accumulation ring groove 121 and a plurality of glue injection grooves 122, the lower glue accumulation ring groove 121 spans the positioning notch 11, the middle portion of the lower glue accumulation ring groove 121 is located on the wall of the opening of the positioning notch 11, the glue injection grooves 122 are respectively arranged on two sides of the opening of the positioning notch 11, one end of each glue injection groove 122 is communicated with the lower glue accumulation ring groove 121, and the other end of each glue injection groove 122 penetrates through the corresponding side wall of the positioning block 1. Therefore, glue can be conveniently stored and injected, and the reliability of the buckling MPP honeycomb pipe joint is further improved. And the structure of the lower rubber ring groove 12 is very simple, and the processing is very convenient.

As shown in fig. 4, there are 4 glue pouring grooves 122, two of the glue pouring grooves 122 are located on one side of the positioning notch 11, and the other two glue pouring grooves 122 are located on the other side of the positioning notch 11. Set up two grooves 122 of making a bet in one side, can be when a injecting glue, another plays the exhaust effect to guarantee that the injecting glue can go on very smoothly, and can guarantee the sufficiency of injecting glue, thereby can reach better sealed effect, this reliability that helps further improving this spiral-lock dress formula MPP honeycomb coupling.

As shown in fig. 4, the two glue pouring grooves 122 on one side of the positioning notch 11 are respectively in butt communication with two ends of the lower glue collecting ring groove 121 on the top surface of the positioning block 1. This can be more conveniently to the lower glue-hiding annular groove 121 injecting glue of that section on the locating piece 1 top surface to guarantee the smoothness and the sufficiency of injecting glue, this helps further to improve this spiral-lock formula MPP honeycomb coupling's reliability.

As shown in fig. 5, the upper glue injection ring groove 22 includes an upper glue storage ring groove 221, at least two glue injection holes 222, and a plurality of upper glue injection grooves 223, wherein the upper glue storage ring groove 221 is formed across the fastening gap 21, the middle portion of the upper glue storage ring groove 221 is located on the opening wall of the fastening gap 21, each upper glue injection groove 223 is respectively disposed on two sides of the opening of the fastening gap 21, one end of each upper glue injection groove 223 is communicated with the upper glue storage ring groove 221, the other end of each upper glue injection groove 223 penetrates through the corresponding side wall of the fastening block 2, each glue injection hole 222 vertically penetrates through the fastening block 2, and the lower end of each glue injection hole 222 penetrates through two sections of the upper glue storage ring grooves 221 in the fastening gap 21. Therefore, glue can be conveniently stored and injected, and the reliability of the buckling MPP honeycomb pipe joint is further improved. At least two glue injection holes 222 are adopted, and the lower ends of the glue injection holes 222 respectively penetrate through the two sections of upper glue hiding ring grooves 221 in the buckling notch 21. Therefore, glue can be conveniently injected into the two sections of upper glue hiding ring grooves 221 in the buckling notches 21, uniformity and sufficiency of glue injection in the upper glue hiding ring grooves 221 can be well guaranteed, a very good fixing and sealing effect can be achieved, and further the reliability and the applicability of the buckling type MPP honeycomb pipe joint can be further improved. And the structure of the upper glue injection ring groove 22 is very simple, and the processing is very convenient.

As shown in fig. 5, since the upper gel ring groove 221 is opened across the fastening gap 21, and the middle portion of the upper gel ring groove 221 is located on the opening wall of the fastening gap 21, two sections of the upper gel ring groove 221 are naturally formed in the fastening gap 21. At least two glue injection holes 222 are adopted, and the lower end of each glue injection hole 222 respectively penetrates into the two sections of upper glue hiding ring grooves 221 in the buckling notch 21. Therefore, glue can be conveniently injected into the two sections of upper glue hiding ring grooves 221 through different glue injection holes 222, so that the requirement of practical use can be well met, and the full glue injection is ensured.

As shown in fig. 5, the number of the glue injection holes 222 penetrating through the single-stage upper glue hiding ring groove 221 is determined according to the number of the upward protrusions at the upper end of the single-stage upper glue hiding ring groove 221. For example, in fig. 5, two conical protrusions 20 are arranged on the single-section upper hide glue ring groove 221, two glue injection holes 222 are adopted, and the lower ends of the two glue injection holes 222 are respectively connected with the tops of the two conical protrusions 20. Therefore, smooth proceeding of glue injection can be well guaranteed, the sufficiency of glue injection can be guaranteed, and therefore firmness and sealing performance of butt joint can be effectively improved.

As shown in fig. 5, the number of the upper glue injection grooves 223 is 4, two of the upper glue injection grooves 223 are located on one side of the fastening gap 21, and the other two upper glue injection grooves 223 are located on the other side of the fastening gap 21. Set up two and go up the injecting glue groove 223 in one side, can be when an injecting glue, another plays the exhaust effect to guarantee that the injecting glue can go on very smoothly, and can guarantee the sufficiency of injecting glue, thereby can reach better sealed effect, this reliability that helps further improving this spiral-lock dress formula MPP honeycomb coupling.

As shown in fig. 5, two upper glue injection grooves 223 on one side of the fastening gap 21 are respectively communicated with two ends of the upper glue hiding ring groove 221 on the bottom surface of the fastening block 2 in an abutting manner. This can glue injection to the section of glue hiding ring groove 221 on the bottom surface of the button block 2 more conveniently, and guarantee the smoothness and sufficiency of glue injection, which helps to further improve the reliability of the button MPP honeycomb pipe joint.

As shown in fig. 2 and 5, the upper opening of each glue injection hole 222 is funnel-shaped. Therefore, glue can be injected into the glue injection holes 222 conveniently, and the convenience in use of the buckled MPP honeycomb pipe joint is further improved.

As shown in fig. 1 to 4, a plurality of positioning pins 14 are disposed on the bottom surface of the positioning block 1. This can be convenient for spacing locating piece 1 on earth steadily to avoid locating piece 1 to remove at will, thereby just can injecing the knot formula MPP honeycomb coupling more steadily, with when burying earth, avoid it to take place to remove, and then can guarantee that the butt joint department of honeycomb pipe can be very stable, reliable butt joint together, this helps further to improve the reliability and the suitability of this knot formula MPP honeycomb coupling.

As shown in fig. 2, at least two reinforcing blocks 15 are embedded in the positioning block 1, and the bottom surface of each reinforcing block 15 is connected to the upper ends of at least two positioning nails 14. Therefore, the installation positioning stability and firmness of the positioning nails 14 can be enhanced, and the structural strength of the positioning block 1 can be enhanced, so that the reliability of the buckling type MPP honeycomb pipe joint is further improved.

The positioning block 1 and the buckling block 2 are both made of MPP, and the positioning block 1 is formed on the reinforcing block 15 in an injection molding mode. Therefore, the buckled MPP honeycomb pipe joint can be conveniently manufactured.

As shown in fig. 6 and 7, when the fastening type MPP honeycomb pipe joint is used, the positioning nails 14 are inserted into the groove bottoms of the buried honeycomb pipes. Then, the end portions of the two honeycomb tubes 30 are placed in the positioning notches 11, the end faces of the two honeycomb tubes 30 are abutted together, and the contact portion of the two honeycomb tubes 30 is located in the lower gel ring groove 121. And then, injecting glue into the lower glue storing ring groove 121 between the honeycomb tube 30 and the positioning block 1 through the exposed lower glue storing ring groove 121, namely injecting glue into the two sections of the lower glue storing ring grooves 121 in the positioning notch 11. And then, buckling the buckling block 2, injecting glue into the two sections of the upper glue hiding ring grooves 221 in the buckling gap 21 through the glue injection holes 222, and in the process of injecting the glue through the glue injection holes 222, till the glue appears at the notch of the buckling gap 21. When glue appears in the lower glue pouring groove 122 and the upper glue pouring groove 223 and is not dried, the glue is poured into the upper glue hiding ring groove 221 and the lower glue hiding ring groove 121 between the buckling block 2 and the positioning block 1 through the upper glue pouring groove 223 and the lower glue pouring groove 122. Thus, glue injection can be completed, and the two honeycomb pipes can be firmly and hermetically butted together. The glue injection mode is introduced, and in the actual butt joint process, other glue injection modes can be adopted to realize fixation and sealing.

Claims (9)

1. The utility model provides a spiral-lock formula MPP honeycomb coupling which characterized in that: including locating piece (1), spiral-lock piece (2), wherein seted up location breach (11) on the top surface of locating piece (1), still set up make a bet of crossing location breach (11) and glue ring groove (12) on the top surface of locating piece (1) to make the middle part of injecting glue ring groove (12) be located the oromural of location breach (11) down, spiral-lock breach (21) have been seted up on the bottom surface of spiral-lock piece (2), still set up last injecting glue ring groove (22) of crossing spiral-lock breach (21) on the bottom surface of spiral-lock piece (2), and make the middle part of going up injecting glue ring groove (22) be located the oromural of spiral-lock breach (21), spiral-lock piece (2) spiral-lock is on locating piece (1) to make spiral-lock breach (21) be relative arrangement with location breach (11), still make go up spiral-lock ring groove (22) and make a bet glue ring groove (12) be relative arrangement, spiral-lock breach (21) and location breach (11) enclose the matched with location breach and form the location outside of the pipe jointly and glue ring groove (12) and be relative arrangement, spiral-lock breach (21) have formed the assorted location breach (11) and have been enclosed outward An aperture (10).

2. The buckled MPP honeycomb tube fitting of claim 1, wherein: the top surface of the positioning block (1) is provided with a plurality of limiting convex columns (13), the bottom surface of the buckling block (2) is provided with a plurality of limiting holes (23), and the limiting holes (23) are respectively sleeved on the limiting convex columns (13).

3. The buckled MPP honeycomb tube fitting of claim 1, wherein: glue injection ring groove (12) down include hide glue ring groove (121), a plurality of glue groove (122) of making a bet down, hide glue ring groove (121) span location breach (11) down and offer to make the middle part of hiding glue ring groove (121) down be located the mouth wall of location breach (11), each glue groove (122) of making a bet is arranged respectively in the notch both sides of location breach (11), and make the one end of each glue groove (122) of making a bet be linked together with hide glue ring groove (121) down, still make the other end of each glue groove (122) of making a bet run through to on the corresponding lateral wall of locating piece (1).

4. The buckled MPP honeycomb tube fitting of claim 3, wherein: the number of the glue pouring grooves (122) is 4, wherein two glue pouring grooves (122) are positioned on one side of the positioning notch (11), and the other two glue pouring grooves (122) are positioned on the other side of the positioning notch (11).

5. The buckled MPP honeycomb tube fitting of claim 1, wherein: go up injecting glue annular (22) including hiding glue annular (221), two at least injecting glue hole (222), a plurality of last injecting glue groove (223), it crosses spiral-lock breach (21) and sets up to go up to hide glue annular (221), and make the middle part of hiding glue annular (221) be located the oral wall of spiral-lock breach (21), each goes up injecting glue groove (223) and arranges respectively in the notch both sides of spiral-lock breach (21), and make the one end of each last injecting glue groove (223) be linked together with last glue annular (221), still make the other end of each last injecting glue groove (223) run through to on the corresponding lateral wall of spiral-lock piece (2), each injecting glue hole (222) is vertical runs through spiral-lock piece (2) and is seted up, and make the lower extreme of each injecting glue hole (222) run through respectively to two sections in spiral-lock breach (21) in hide glue annular (221).

6. The buckled MPP honeycomb pipe joint as set forth in claim 5, wherein: the number of the upper glue injection grooves (223) is 4, two of the upper glue injection grooves (223) are located on one side of the buckling gap (21), and the other two of the upper glue injection grooves (223) are located on the other side of the buckling gap (21).

7. The buckled MPP honeycomb pipe joint as set forth in claim 5, wherein: the upper orifice of each glue injection hole (222) is of a funnel-shaped structure.

8. The buckled MPP honeycomb tube fitting of claim 1, wherein: the bottom surface of the positioning block (1) is provided with a plurality of positioning nails (14).

9. The buckled MPP honeycomb tube fitting of claim 8, wherein: at least two reinforcing blocks (15) are embedded in the positioning block (1), and the bottom surface of each reinforcing block (15) is connected with the upper ends of at least two positioning nails (14).

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