NL2015621B1 - Easy guided pilot tube. - Google Patents
Easy guided pilot tube. Download PDFInfo
- Publication number
- NL2015621B1 NL2015621B1 NL2015621A NL2015621A NL2015621B1 NL 2015621 B1 NL2015621 B1 NL 2015621B1 NL 2015621 A NL2015621 A NL 2015621A NL 2015621 A NL2015621 A NL 2015621A NL 2015621 B1 NL2015621 B1 NL 2015621B1
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- NL
- Netherlands
- Prior art keywords
- tube
- head
- segment
- assembly according
- pressure
- Prior art date
Links
- 238000003825 pressing Methods 0.000 claims abstract description 37
- 239000002689 soil Substances 0.000 claims description 26
- 238000005553 drilling Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000011152 fibreglass Substances 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 3
- 230000007423 decrease Effects 0.000 claims 1
- 238000004049 embossing Methods 0.000 claims 1
- 239000002990 reinforced plastic Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 241001082241 Lythrum hyssopifolia Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009730 filament winding Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- QQVIHTHCMHWDBS-UHFFFAOYSA-L isophthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC(C([O-])=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-L 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 poly propylene Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
- E21B7/205—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes without earth removal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The present invention is in the field of guided pressing small and medium sized tubes over distances of a few meters up to 500 meters, an assembly comprising a pressing segment and an outer guiding tube, said pressing segment, and said outer guiding tube. The present invention is suited for heavy traffic constructions.
Description
Title Easy guided pilot tube
FIELD OF THE INVENTION
The present invention is in the field of guided pressing small and medium sized tubes over distances of a few meters up to 500 meters, an assembly comprising a pressing segment and an outer guiding tube, said pressing segment, and said outer guiding tube. The present invention is suited for heavy traffic constructions.
BACKGROUND OF THE INVENTION
In general prior art construction of tubes involves drilling of a tube-element. The drill-head typically removes soil, and transport soil back through a drill tube to an entrance cavity or the like, such as by a means for removing excavated soil from the drilling segment, such as a helical chain, a press, a screw-pump, a conveyer, and the like. The excavated soil needs to be removed to another location.
When finished with drilling a drill may be removed. However at an exit of the tube-element a receiving hole has to be dug, typically a few meters deep and a few meters wide, in order to remove the drill head and to have access to the exit. In non-populated areas such might not be much of an issue. However in populated areas not alone extra security measures have to be taken, but more important if close to a transport zone, such as a way, a railway, or the like, traffic has to be stopped. In addition such removal can only take place during tranquil periods, such as during the night; such is costly and in fact more risky as well.
Before removing the drill a tube or the like may be provided into a drill tube or the like. Thereafter the drill tube is removed. Hence drilling and providing a tube includes the steps of providing a drill tube, drilling, removing the drill, entering a tube into the drill tube, and removing the drill tube. In addition the drill head needs to be removed as well from the above receiving hole.
It is also relatively difficult to provide tubes that are suited for a given purpose, such as being water-tight and soil tight. In addition further requirements may be present, such as when used underneath roads or buildings.
Hence there is a need for an improved and more effi cient system and method of providing tubes in a soil, which overcomes at least some of the drawbacks of the prior art, without jeopardizing functionality and potential advantages thereof .
SUMMARY OF THE INVENTION
The present invention relates in a first aspect to an assembly according to claim 1, a hollow conduct according to claim 20, an auger press segment according to claim 21, and a method according to claim 26.
The present assembly provides an easy guided pilot tube assembly, comprising an outer tube and an auger pressing segment. The assembly is forced through soil by a press. The press typically exerts a force of up to 50 tons therewith pushing aside soil. A rotating action of a press head provides sufficient control of a 3-dimensional movement direction of a head section. The assembly is suited for applications wherein the soil can be pushed away. Herein the soil is the mixture of minerals, such as stone, sand, clay, and so on, and whatever is further present in the soil, such as organic matter, peat, gases, and water, and typically having a density of 1-3 gr/cm3. The present system is not suited for rock or the like.
In view of the forces applied upon pressing and thereafter the present tube is preferably sufficient stiff and strong, such as being reinforced with fiber, such as glass fiber, carbon fiber, aramid fiber, and basalt fiber, typically having a tangential stiffness and compressibility of 10 * 103 N/m2, or better, which is sufficient for coping with a load of the heaviest class vehicles (verkeersklasse 60 in the Netherlands) . The tangential stiffness and compressibility is preferably > 20 * 103 N/m2, more preferably > 50 * 103 N/m2, even more preferably > 100 * 103 N/m2, such as > 250 * 103 N/m2, e.g. 300 * 103 N/m2, 350 * 103 N/m2, 400 * 103 N/m2, and 500 * 103 N/m2. Pipe stiffness is considered to refer to a resistance to deflection. Pipes of standard stiffness classes are regarded as flexible because pipe deflection has a considerable effect on the load and pressure distribution in the soil, with the result that the soil plays a major role in the overall load-bearing system. In an example, the greater a pipe's wall thickness, the greater is the stiffness and therefore its ability to resist external bending loads or low internal pressure; the wall thickness may in addition to a choice of a material be varied in this respect. For better understanding tubes can be classified into certain stiffness classes. SN 5000: Pipes (or tubes) of this stiffness are selected for minor loads, for example when installed in mixed soil at a depth of 3 m and a live load corresponding to a 60 t truck. SN 10000: These pipes are designed for high loads, for example for installation in mixed soil at a depth of 4 m or a live load corresponding to a 60 t truck with little soil cover. SN >10000: For special cases pipes can be produced with a stiffness up to well over 500,000 N/m2, e.g. for landfill or well pipes. In the above SN refers to a Nominal Stiffness in N/m2. The present tubes are according to the two latter (more stiff) classes .
Examples of the present tube relate to GRP (Glass Reinforced Polyester) Pipes (GVK). From a mechanical point of view, it has proved useful to classify GRP pipes according to stiffness - as opposed to wall thickness. Instead of polyester other materials may be used as well, typically polymers, such as poly alkanes, such as PTFE, poly alkenes, e.g. poly propylene, polyesters, such as PET, vinyl esters, a poly epoxy, and polyamides, such as nylon, and resins, such as phenol formaldehyde resin, as well as co-polymers thereof, and substituted polymers thereof, and combinations thereof.
Both the pressing segment and tube are modular. The modular parts of the outer guiding tube are fixed together during pressing, typically by the force exerted on them. The pressing segment modules are removably attached to one and another. Pressing proceeds until a next follow up part can be attached, to the tube and to the pressing segment. The inner diameters of the tube modules are the same, in order to allow passage and free rotation of the pressing segment. It is preferred that also the thickness is the same, hence the outer diameter. For the follow up tubes typically the thickness is the same.
The press head receives the head tube, therewith protecting the head tube, fixing the head tube segment relative to the press segment and mitigating forces exerted on the tube and press. The receiving section typically also allows for compensating follow up tube product variation, e.g. in terms of length thereof.
For pilot guided pressing a guiding element is provided. The guiding element is preferably removably attached to the press head. In an alternative the guiding element is provided in a first follow up press segment, as an integral part thereof .
The tube inner diameter (Dti) is slightly larger, such as 0.05-10 mm larger, preferably 0.1-5 mm larger, more preferably 0.2-4 mm larger, such as 0.5-2.5 mm larger, than the outer auger press diameter (Dd0) allowing free rotation of the auger pressing segment.
The assembly further comprises a means (400) for pilot guided combined auger pressing of the tube and the auger pressing segment, hence the outer guiding tube and auger pressing segment are pressed within one and the same process step .
The present outer guiding tube is water and sand tight. The tube can be used directly to provide conducting elements such as cables, conducts, piping, glass-fiber, and so on. Typically the present outer guiding tube can withstand higher temperatures, such as above 60 °C, low temperatures, such as below -40 °C, and it can withstand temperature changes, such as of ±80 °C. The tube is preferably non-permeable, such as to contaminations being present in the soil. It is typically also chemically inert to contaminants being present in the soil, environment, or inside the tube. The inner side of the outer guiding tube is typically provided with a smooth surface which amongst others supports easy access for cables and conducts. The outer wall of the tube typically has a low coefficient of friction μ, e.g. lower than 0.5, preferably a low coefficient of kinetic friction yk, such as < 0.4 (e.g. according to DIN 51130). The tube is closed and hence no solid contaminants can enter or move through the outer tube. The present tube is preferably light weight, i.e. having a low specific mass, typically of less than 2.5 gr/cm3, preferably less than 2 gr/cm3, such as less than 1.5 gr/cm3. The present tube can also withstand high pressure forces, such as up to 50 tons. As such a wide range of applications is provided.
Contrary to many prior art devices the present assembly does not remove soil, especially for smaller diameter tubes up to 300 mm, which is a big advantage as no soil needs to be removed from a drilling or pressing location. In addition there is no need for a receiving hole, which makes the assembly more cost-effective, safer, and having a lower impact on measures for providing safety to workers and the direct environment. If necessary the drill head can be removed by digging only a very small hole, after localizing the drill head. Such is typically not much of an issue, even when the location is relatively dangerous, such as close to a (high-)way or railway track.
Thereby the present invention provides a solution to one or more of the above mentioned problems.
Advantages of the present invention are detailed throughout the description.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates in a first aspect to An easy guided pilot tube assembly according to claim 1.
In an exemplary embodiment of the present assembly the outer guiding tube is made of a reinforced material.
In an exemplary embodiment of the present assembly an outer diameter (Dt0)of the head tube and at least one follow up tube is the same.
In an exemplary embodiment of the present assembly the auger press heat comprises a magnetic material or wherein the auger press head is a disposable.
In an exemplary embodiment of the present assembly the head tube and or at least one follow up tube are made of a material selected from glass reinforced plastic, cast iron, carbon reinforce plastic, glass reinforced synthetic material, carbon reinforce synthetic material, a reinforced polymer, and a high strength polymer.
In an exemplary embodiment of the present assembly the head tube has a length (lht) of 10-200 cm, preferably 20-100 cm, such as 30-50 cm.
In an exemplary embodiment of the present assembly the at least one follow up tube has a length (lfut) of 10-200 cm, preferably 20-100 cm, such as 30-50 cm.
In an exemplary embodiment of the present assembly the auger press head has a length (lah) of 10-200 cm, preferably 20-100 cm, such as 30-50 cm.
In an exemplary embodiment of the present assembly the at least one follow up auger press segment has a length (las) of 10-200 cm, preferably 20-100 cm, such as 30-50 cm.
In an exemplary embodiment of the present assembly the tubes have a wall thickness (tw) of 2-10 mm.
In an exemplary embodiment of the present assembly the tube inner diameter (Dti) is 5-500 mm, preferably 10-300 mm, more preferably 15-250 mm, even more preferably 20-200 mm, such as 50-150 mm.
In an exemplary embodiment of the present assembly the at least one follow up auger press segment is hollow to function as at least one optical passage.
In an exemplary embodiment of the present assembly at least one tube follow up segment comprises an inner stop.
In an exemplary embodiment of the present assembly the head tube has a receiving section (25) at one end thereof, wherein the wall thickness of the tube is increased from the end inwards .
In an exemplary embodiment of the present assembly the at least one follow up tube has a receiving section (25a,25b) at at least one end thereof wherein the wall thickness of the tube is increased from the end inwards.
In an exemplary embodiment of the present assembly the inner diameter of the at least one follow up tube is decreased from one end inwards and wherein the receiving section has an average thickness smaller than 50% of the wall thickness (tw) of the tube and/or wherein the inner diameter of the receiving section remains constant and wherein the receiving section has an average thickness larger than 50% of the wall thickness (tw) of the tube.
In an exemplary embodiment of the present assembly a length of the receiving section (lrs) is 10-100 mm, preferably 15-75 mm, more preferably 20-50 mm, such as 25-45 mm.
In an exemplary embodiment of the present assembly the means (400) for pilot guided combined auger pressing of the tube and the auger pressing segment is selected from a combined auger press,
In an exemplary embodiment of the present assembly the means (400) for pilot guided combined auger pressing comprise at least one of a precise angle measurement device, such as a theodolite, an optical camera, a distance measurement device, an accelerometer, a transceiver, a positioning device, a monitor, and a connecting means.
In an exemplary embodiment of the present assembly the tube segments comprise at least one recess for receiving a flexible sealing ring, and a sealing ring, wherein the recess has a width of 2-15 mm and a depth of 0.5-5 mm.
In a second aspect the present invention relates to an outer guiding tube (200) for use in an assembly according to the invention, the outer tube comprising (ia) an head tube (21), and (iib) at least one follow up tube (22a,22b), wherein the head tube and the at least one follow up tube are removably connected, wherein the tubes have a same inner diameter (Dti) , and a same thickness (t) .
In a third aspect the present invention relates to an auger pressing segment (300) for use in an assembly according to the invention, the auger pressing segment comprising (iia) a auger press head (31), the auger press head comprising a head tube receiving section for receiving an end section of the head tube, (iib) a auger press guiding element (33) removably attached to the auger press head, and (iib) at least one follow up auger press segment (32a,32b), wherein the auger press guiding element and at least one follow up auger press segment are removably connected, wherein the auger press head and at least one auger press segment have a same outer diameter (Dd0) .
In an exemplary embodiment of the auger pressing segment the head tube receiving section extends 10-200 mm.
In an exemplary embodiment of the auger pressing segment the head tube receiving section comprises an inner stop .
In an exemplary embodiment of the auger pressing segment the receiving section has an inner diameter which is 0.1-10 mm larger than the outer diameter of the head tube.
In an exemplary embodiment of the auger pressing segment the auger press head has a cylindrical drill bit with a cut-out section under a constant or varying angle of 20-70° relative to a side of the cylinder, preferably 30-65°, more preferably 40-60°, such as 45-55°. In principle typically used auger press heads can be used and a selection thereof can be adapted to various soils. It has been found that the cut-out section reduces friction and improves movement of the auger press segment through the soil.
In an exemplary embodiment of the auger pressing segment the auger press head is closed.
In a fourth aspect the present invention relates to a method of auger pressing a passage with a length of 2-500 meters comprising the steps of digging an entrance cavity for auger pressing, at one end of the passage, providing an assembly according to the present invention, pilot guiding auger pressing a first segment of a passage way using the auger press head and head tube and thereby forcing soil aside, (a) attaching at least one follow up tube to the head tube and at least one follow up auger press segment to the auger press head, (b) pilot guiding auger pressing at least one follow up segment of a passage way comprising at least one follow up tube and at least one follow up auger press segment and thereby forcing soil aside, repeating steps (a) and (b) for auger pressing optional further follow up segments of the passage way, and detaching a first follow up auger press segment from the auger press head, retracting the at least one auger press segment from the tube segment. The method is performed in one pass. With the present pilot guiding means length of up to 150 meters are possible, as for larger length optical control of the pilot head becomes cumbersome. In view thereof lengths are more often limited to 50-100 meters, such as 70-90 meters.
In an exemplary embodiment the present method further comprises the steps of determining a location of the auger press head, and retrieving the auger press head, such as by digging a hole at the other end of the passage way.
The invention is further detailed by the accompanying figures and examples, which are exemplary and explanatory of nature and are not limiting the scope of the invention. To the person skilled in the art it may be clear that many variants, being obvious or not, may be conceivable falling within the scope of protection, defined by the present claims.
SUMMARY OF THE FIGURES
Fig. 1 shows a cross-section of an example of a head tube .
Fig. 2 shows an enlarged part of the head tube.
Fig. 3 shows a cross-section of an example of a follow up tube.
Fig. 4 shows an enlarged part of the follow up tube.
Fig. 5a shows a cross section of the present auger head, fig. 5b a front cross sectional view of a follow up auger press segment 32a for entering into the receiving section and fig. 5c a cross section of one follow up auger press segment (32a).
Fig. 6 show a deflection (%) as a result of a force applied.
DETAILED DESCRIPTION OF THE FIGURES
In the figures: 100 pilot tube assembly 200 outer guiding tube 21 head tube 22a follow up tube 22b follow up tube 25 receiving section head tube 25a receiving section follow up tube 25b receiving section follow up tube 300 Auger pressing element 31 auger press head 32 follow up auger press segment 33 auger press guiding element 400 means for pilot guiding
Dd0 outer auger press diameter
DfUt reduced inner diameter follow up tube
Dri inner diameter recess
Dr0 outer diameter recess
Dss outer diameter solid segment auger press
Dti tube inner diameter
Dt0 outer diameter head tube
Dtro reduced outer diameter head tube lah auger press head length las auger press segment length lfUt follow up tube length lht head tube length lrs receiving section length tw tubes wall thickness
In figure 1 a head tube 21 is shown. All of the below dimensions (for all figures) are ±0.1 mm, except if indicated otherwise. The head tube has a length lht of 750 mm. The inner diameter Dti is 100 mm and the outer diameter Dt0 is 116 mm (both ±0.3 mm). The outer diameter may undergo a postprocessing step, e.g. in order to more precisely produce the diameter. The receiving section length lrs is 110 mm. Indicated is also a part that is further enlarged in figure 2.
Figure 2 shows an enlarged part of figure 1. Therein the inner diameter Dti is 100 mm and the outer diameter Dt0 is 116 mm (both ±0.3 mm). Further a reduced outer diameter head tube Dtro of 110 mm, and an outer diameter recess Dr0 of 105 mm are shown. Two recesses are shown. The recesses have both a width of 8 mm with an intermediate width between the recesses of 15 mm. Further the reduced outer diameter head tube sections have a width of (seen from left to right) 6 mm, 15 mm (as mentioned) and 8 mm, respectively. A total length of the receiving section therefore is 45 mm.
Figure 3 shows a follow up tube with a length of 1045 mm and an outer diameter Dt0 is 116 mm (±0.3 mm). Indicated is also a part that is further enlarged in figure 4.
Figure 4 shows an enlarged part of figure 3. Therein the inner diameter Dti is 100 mm and the outer diameter Dt0 is 116 mm (both ±0.3 mm). Further a reduced inner diameter follow up tube Dfut of 111 mm, and an inner diameter recess Dri of 105 mm with a width of 8 mm are shown. Further the reduced inner diameter follow up tube sections have a width of (seen from left to right) 5 mm, 8 mm (as mentioned) and 32 mm, respectively. A total length of the receiving section therefore is 45 mm. Together with the reduced outer diameter section, and one or two flat O-rings (not shown), having a width of 7-8 mm and a thickness of 1.5-2 mm, a firm and tight connection between two consecutive tubes can be made.
Fig. 5a shows a cross section of the present auger head. The head has a pointed top, with an angle a of 35-65°, preferably 40-50°, and a second angle β of 180-(35-65)°, i.e. 115-145°, preferably 130-140°. The outer diameter of the auger head Dd0 is 125 mm, that Dss of an inner largely solid segment receiving section is 100 mm, the length of the receiving section lrs is 100 mm, a thickness of said (circular) receiving section is 2.5 mm. The solid segment has an inner non-circular diameter Diss of 60 mm, a receiving length lri of 60 mm, a top thickness tt of 15 mm and a bottom thickness tb of 25 mm (hence not circular receiving part). The receiving segment may be welded to the head.
Figure 5b shows a front cross sectional view of a follow up auger press segment 32a for entering into the receiving section with a diameter of 70 mm and a cut-off section with a width of 60 mm. Figure 5c shows a cross section of one follow up auger press segment (32a) with a diameter Diss of 60 mm, a length of a top part of 55 mm, a stop part extending 15-25 mm out of the top part and having a width of 20 mm, and a right section symmetrically positioned around a virtual central axis thereof.
Figure 6 show a deflection (%) as a result of a force applied. On the vertical axis the applied force in N is plotted versus a relative deflection (in %) , calculated as the deflection (in meter) divided by a relative size.
EXAMPLES/EXPERIMENTS
The invention although described in detailed ex planatory context may be best understood in conjunction with the accompanying examples and figures.
Experiment
The present tube has been tested according to EN 14364, EN 1226, EN 1228 and ASTM D 2412. A test specimen was cut from a pipe with number 0002 ID 150. The pipe relates to a so-called helical filament winding 85° glass fiber reinforced polyester isophthalate resin (direct rowing TEX 2400) type. Three measurements per test were performed on 1 specimen, at 25 °C. The thickness was approximately 1.48 cm, an outer diameter 17.9 cm and an inner diameter of 16.4 cm.
For the EN 14364 a specimen was placed in a press machine between two parallel compression plates. According to method B a load was applied in steps such that a relative deflection of 2.5% and 3.5% was reached. The deflection was maintained constant for two minutes and an average value for three sectors was determined. A similar test was performed, now having a relative deflection of 5%, which was also maintained for two minutes. The absence of internal cracking and structural break was established.
The present tubes were capable of withstanding a force of up to 300 * 103 N/m2, without showing any deterioration. The tangential stiffness of the tubes is thus similar, namely capable of withstanding at least 300 * 103 N/m2.
Position Charge F Deflection y Deflection (newton) (meter) relative y/dm (%) 360° - 180° 2068.0 0.0010 0.6084 3073.0 0.0020 1.2169 4563.0 0.0030 1.8253 15366.0 0.0050 3.0421 15193.0 0.0050 3.0421
Table 1. Results of deflection measurements of charges on various positions of a tube. The position are taken in the indicated segment of the tube.
The specific tangential initial stiffness is calculated as follows: SO = (0,0186 + 0,025 y/dm) F/(L χ y) = 300.915 N/m2. The results are also plotted in figure 6.
Similar results are obtained for the 60° - 240° section, resulting in an average SO of 341.934 N/m2, and the 120° - 300° section, resulting in an average SO of 290.596 N/m2. In all cases no cracking and no structural break was observed.
Claims (27)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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NL2015621A NL2015621B1 (en) | 2015-10-15 | 2015-10-15 | Easy guided pilot tube. |
PCT/NL2016/050703 WO2017065606A1 (en) | 2015-10-15 | 2016-10-12 | Guided pilot tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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NL2015621A NL2015621B1 (en) | 2015-10-15 | 2015-10-15 | Easy guided pilot tube. |
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NL2015621B1 true NL2015621B1 (en) | 2017-05-09 |
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NL2015621A NL2015621B1 (en) | 2015-10-15 | 2015-10-15 | Easy guided pilot tube. |
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NL (1) | NL2015621B1 (en) |
WO (1) | WO2017065606A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB866658A (en) * | 1959-07-31 | 1961-04-26 | Robin Nodwell Mfg Ltd | A method and apparatus for driving holes through unconsolidated earth formations |
CA970762A (en) * | 1973-05-22 | 1975-07-08 | Lewis B. Logan | Impact drive point |
US4286651A (en) * | 1980-04-28 | 1981-09-01 | Environmental Impact Research Group | Geothermal heating system and method of installing the same |
DE3513750A1 (en) * | 1985-04-17 | 1986-10-23 | Celler Maschinenfabrik Gebr. Schäfer GmbH & Co KG, 3100 Celle | Method and device for the direction-controlled feeding of pipes in accordance with the displacement principle |
EP1006322A2 (en) * | 1998-12-04 | 2000-06-07 | A.P. van den Berg Beheer B.V. | Method of inserting a heat exchanger into the ground and ground heat exchanger |
EP1983274A2 (en) * | 2007-04-17 | 2008-10-22 | A & S Umwelttechnologie AG | Ground probe for extracting thermal energy from the ground and/or releasing thermal energy to the ground |
-
2015
- 2015-10-15 NL NL2015621A patent/NL2015621B1/en not_active IP Right Cessation
-
2016
- 2016-10-12 WO PCT/NL2016/050703 patent/WO2017065606A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB866658A (en) * | 1959-07-31 | 1961-04-26 | Robin Nodwell Mfg Ltd | A method and apparatus for driving holes through unconsolidated earth formations |
CA970762A (en) * | 1973-05-22 | 1975-07-08 | Lewis B. Logan | Impact drive point |
US4286651A (en) * | 1980-04-28 | 1981-09-01 | Environmental Impact Research Group | Geothermal heating system and method of installing the same |
DE3513750A1 (en) * | 1985-04-17 | 1986-10-23 | Celler Maschinenfabrik Gebr. Schäfer GmbH & Co KG, 3100 Celle | Method and device for the direction-controlled feeding of pipes in accordance with the displacement principle |
EP1006322A2 (en) * | 1998-12-04 | 2000-06-07 | A.P. van den Berg Beheer B.V. | Method of inserting a heat exchanger into the ground and ground heat exchanger |
EP1983274A2 (en) * | 2007-04-17 | 2008-10-22 | A & S Umwelttechnologie AG | Ground probe for extracting thermal energy from the ground and/or releasing thermal energy to the ground |
Also Published As
Publication number | Publication date |
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WO2017065606A1 (en) | 2017-04-20 |
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