EP3411544B1 - Service pit and method for assembling and installing the service pit - Google Patents
Service pit and method for assembling and installing the service pit Download PDFInfo
- Publication number
- EP3411544B1 EP3411544B1 EP17747864.1A EP17747864A EP3411544B1 EP 3411544 B1 EP3411544 B1 EP 3411544B1 EP 17747864 A EP17747864 A EP 17747864A EP 3411544 B1 EP3411544 B1 EP 3411544B1
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- European Patent Office
- Prior art keywords
- service pit
- rib
- pit
- walls
- rib plates
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- 238000000034 method Methods 0.000 title claims description 11
- 239000000463 material Substances 0.000 claims description 26
- 239000011796 hollow space material Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 4
- 230000001747 exhibiting effect Effects 0.000 claims description 3
- 238000003698 laser cutting Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims description 2
- 230000037361 pathway Effects 0.000 claims 2
- 101150054854 POU1F1 gene Proteins 0.000 description 19
- 238000009434 installation Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
- E04H5/06—Pits or building structures for inspection or services
Definitions
- the present invention relates to a service pit to be installed on a foundation and comprising a module, which have a metal support frame, e.g. steel, and have at least two longitudinal side walls and a bottom, where at least the side walls exhibiting an inner wall and an outer wall arranged at a distance from each other, said side walls, bottom and foundation bounding a hollow space.
- the invention also relates to a method for assembling the service pit according to the invention, and further it relates to a method for installing the service pit on a foundation in a space in the ground.
- Service pits of the above mentioned kind are known from e.g. DE4324339 and DE4345415 , and are used in e.g. workshops for installation or maintenance of motor vehicles, hence the staff in a comfortable upright position may work under the vehicle.
- a settable material such as concrete and/or an isolating foam.
- the known pits are made of relatively thick steel plates and having a relatively large distance of about 200 mm between their side walls.
- the known pits suffer from the disadvantage that a large amount of steel and also fill material have to be used to obtain the required strength.
- DE 20201310277 U1 there is known a special kind of service pit, i.e. to be installed hanging onto supporting walls instead of being installed on a foundation. Also a design as shown in DE 20201310277 U1 suffers from basically the same disadvantages as mentioned above, despite the fact that transversally extending, supporting T-beams are used to span the hollow space between the side walls and bottom walls.
- the outer wall of the pit extends all the way down to the foundation. Accordingly, the fill material will be filled into the hollow space bounded by the outer side walls, the inner side walls, the bottom and the foundation, implying difficulties in detecting desired filling in all parts of the hollow space, especially if the filling is performed in one step via an upper gap between said side walls, as described in the above cited prior art. Hence, there is a risk of air being trapped in the hollow space, especially in the bottom region, thus resulting in a weakened construction.
- DE-G-9320679 which is a branch off from DE4324339 , it is suggested to provide a longitudinally angled bottom section to minimize air trap risk, which however results in a complex structure leading to extra cost. Moreover, according to prior art methods it may be complicated to install supply channels, etc. (e.g. for ventilation, compressed air, electricity).
- a service pit according to the claims.
- at least the inner and outer walls may be made with a smaller thickness, hence reducing the amount of steel used.
- the thus reinforced service pit may be manufactured with less distance between the inner and the outer wall of the side walls, thereby reducing the required amount of fill material to be used.
- the ribs are made of plate material, preferably the same kind of metal plate as the inner and outer walls, e.g. 3 mm steel plate.
- the rib plates extend essentially perpendicular to the plane of the side walls extend over the whole hollow space and have the form of an U like the rib plates in a double-hulled vessel.
- the rib plates are preferably provided with engagement means for cooperation with corresponding means provided in the inner walls.
- said engagement means on the rib plates comprise protruding fitting members adapted to exactly fit in to corresponding recesses in the inner walls.
- the fitting members and recesses are preferably produced by the use of laser cutting, as well as the contours of the rib plates .
- the lower corners of the side walls may be provided at an obtuse angle relative to vertical, preferably about 45°.
- the service pit may be provided with a horizontal longitudinal beam arrangement in the hollow space of the lower corner region. This facilitates a strong construction and enables a reduced width inside of the bottom part, which enables arranging path way for lifting devices in the pit that is only 1300 mm. In many pits there is a need of using 1500 mm, which requires more costly equipment.
- the service pit is assembled by a method comprising the steps as defined in claim 11.
- the inner walls may be attached to the rib plates in any suitable manner, however it is preferred that the inner walls are attached to the rib plates by bringing engagement means on the rib plates in engagement with corresponding means provided in the inner walls. In a preferred embodiment protruding fitting members on the rib plates are introduced into corresponding recesses in the inner walls.
- the service pit is installed by a method comprising the steps as defined in claim 14.
- the service pit according to the invention may be pre-produced or it may be assembled on site.
- Fig. 1 a perspective view of a service pit 1 according to one embodiment of the invention.
- the service pit 1 comprises several modules 3, each having two longitudinal side walls 5, 6 and a bottom 7.
- Each module 3, has a longitudinal length M of about 1800 - 3200 mm, more preferred 2400 mm.
- the reason why it is preferred to use modular lengths as mentioned above, is that it is preferred to use modules that are multiples of the basic building module measurement 600 mm and that it from the perspective of other aspects with this kind of construction project is an advantage to use four times the basic modularity due to the fact that it will fit well into most existing production lines for producing the metal plates forming the inner 9 and outer 8 walls of the pit 1.
- each side wall 5, 6 comprise of an inner wall 8 and an outer wall 9 arranged at a distance from each other, thus bounding a space 10 them between.
- Fig. 2 shows a cross section of the service pit shown in Fig. 1 , further comprises a number of rib plates 11 (see Fig 3 ) being arranged transversally in the space 10 and securely attached to at least the inner and outer walls 8, 9.
- the rib plates 11 are made of the same kind of metal plate as the inner walls 8, preferably 2-6 mm steel plate (most preferred 2-4 mm) and extend perpendicular to the plane of the side walls over the whole space 10, thus exhibiting the form of an U.
- the width (in the longitudinal direction of the service pit 1) of a rib plate 11 substantially equals to the material thickness of a rib plate 11.
- the distance between the rib plates is preferably the basic building module measurement, i.e. 600 mm.
- Preferably the lower edge of such support ribs is positioned above the floor plate 72.
- the applied amount of steel may be reduced, because the inner and the outer wall of the side walls 8, 9 may be made with a smaller thickness than conventionally used, e.g. steel plate of about 3 mm thickness.
- the thus reinforced service pit may be manufactured with less distance, preferably about 80 - 120 mm, between the inner 8 and the outer wall 9 of the side walls 5, 6 thereby reducing the required amount of fill material to be used.
- the outer rib 11a is somewhat larger than the other, intermediate rib plates 11.
- U-beams 51 At the top of the pit 1 there are arranged two parallel U-beams 51, which preferably span the whole length of the pit 1. Supporting distance members 50 extend transversally between the two beams 51, as also lifting members 52.
- the lower outer corners 18 between the side walls 5, 6 and the lower edge of the rib plates 11 are provided at a first obtuse angle ⁇ relative to vertical, preferably about 110-135°, thus making the construction stronger.
- the upper edge 71 of the rib plates 11 are also provided at an obtuse angle ⁇ relative to vertical, which may be less obtuse than the first angle ⁇ , to have the floor plates 70 inclined at an angle ⁇ relative to vertical, preferably about 95-105°, to allow liquid to collect in a preformed channel 74 in the floor plate 70, i.e. in the middle of the pit.
- the shown service pit 1 is also provided with a horizontal longitudinal beam arrangement 19 in the lower corner region 18, which further contributes to a strong construction and enables a reduced width PW inside of the bottom part. It enables arranging a path way for lifting devices of reduced span width in the pit, e.g. that is only 1300 mm. In many pits there is a need of using 1500 mm, which requires more costly equipment.
- the service pit 1 is further shown to comprise a stairway 12, which is positioned at an end wall 15 of the service pit 1.
- Fig. 3 shows one rib half 11' of an U-shaped rib plate 11 according to the preferred embodiment of the invention, e.g. to provide for more easy transportation.
- each rib half 11' is provided with protruding fitting members 13, preferably at least two fitting members 13 along the inner edge 61.
- These fitting members 13 preferably protrude about the same distance as the thickness of the wall 8 to be fitted there.
- the rib plates 11 are provided with holes 14, so that the amount of steel is reduced without appreciably compromising the strength of the construction.
- each rib half 11' is arranged with a recess 72 forming one half of the space for mounting of the preformed channel 74 in the floor plate 70.
- the width of the recess 72 is preferably many times smaller than the width W of a rib half 11'.
- Preferred measures of a rib half 11 is a height H of about 1700 - 2000 mm, a width W of about 800 - 900 mm, i.e. wherein the width W is about 40-60 % of its height H.
- the portion of the rib half 11 spanning the major portion of the space between the walls 8, 9, which also is the most thin part of the rib half 11, has a transversal width T that is about 80 - 120 mm.
- FIG. 3 indicates that at the outer periphery of the rib 11 there is arranged a flange, preferably by bending the edge of the plate, which flange 60 (e.g. 20-30 mm wide) is used for attachment of the outer plates 9 to the rib plates 11.
- a flange preferably by bending the edge of the plate, which flange 60 (e.g. 20-30 mm wide) is used for attachment of the outer plates 9 to the rib plates 11.
- this is achieved by using screws, more preferably self-threading kind, e.g. having premade holes in the flange 60 of about 5-6 mm and appropriate corresponding screws adapted to that hole size. Thanks to the use of screws an efficient manufacturing is achieved that also eliminates possible difficulties related to welding, e.g. facilitates the use of less corrosive metal plates (e.g. galvanized) that are more difficult to weld.
- the inner plates 8 are made of conventional (black) steel plates that are relatively cheap and easy to weld, whereas on
- FIG. 4 is shown is a perspective view of an preferred embodiment of an inner wall plate 8', which is provided with recesses 16 adapted to exactly accommodate the protruding fitting members 13 on the rib plates 11, wherein preferably each inner wall plate 8' is arranged with a plurality of parallelly arranged rows of recesses 16, to enable fitting of a plurality of parallelly arranged rib plates 11.
- each inner wall plate 8' is arranged with a plurality of parallelly arranged rows of recesses 16, to enable fitting of a plurality of parallelly arranged rib plates 11.
- the fitting members 13 and recesses 16 are preferably produced by the use of laser cutting.
- the rib plates 11 may similarly be attached to the outer walls 9.
- Fig. 5 there is shown one piece of the beam arrangement 19 used in the corner area 18 of the service pit 1.
- the beam 19 preferably has a length 1 that is larger than the modular width M, i.e. a width that is larger than 2,4 m, preferably a width that can span at least two modules, e.g. between 5-10 m.
- a floor plate 70 having a central channel 74.
- the length of the floor plate is preferably the same as the length M of a module, e.g. 2400 mm.
- an L-bend 72 adjacent the longitudinal outer sides of the floor plate 70, which L-bends 72 are used to sealingly join the floor plate 70 with the lower edge of the inner side wall 8, preferably by the use of welding.
- the bottom of the channel 74 is arranged to create runoff for liquid, to lead collected liquid to a drainage (not shown).
- the depth of the channel 74 varies in the longitudinal direction, which in turn results in the need of floor plates having a proportionally varied original/nominal width.
- the nominal width before bending it varies giving it a triangular form, which is being bent to the desired form having the edges 72 in parallel and a channel 74 with varying depth.
- the upper U-shaped supporting beams 51 will be positioned on to the floor and are accurately positioned in relation to each other by means of transversal support and distance members 50 (see Fig. 1 ). Some of the distance elements 52 are specifically designed to be used for lifting and moving of the pit 1.
- a jig (not shown) is positioned on to the support beams 51.
- the inner walls 8 will be correctly positioned by means of the jig (n.b., the pit 1 will be upside down during the prefabrication thereof).
- the beam arrangement 19 is welded on to the inner plates 8 and thereafter also the floor plates 70.
- the rib plates 11 will be attached to the pit 1, by means of lifting each rib half 11 in to position by the use of the inter fit between the fitting member 13 and recesses 16.
- the rib halves 11 are welded, preferably by means of intermittent welding, into connection with the inner walls 9, the floor plate 70 and also to each other at the joining centrally positioned vertical edges.
- the outer plates 8 are fit on to the outer edges, i.e. the flange 60, of the rib plates 11, e.g. by means of screws.
- Fig. 8 shows an adjustable foot 20 for adjusting the position of the service pit 1 during installation.
- the shown adjustable foot 20 comprises a bottom plate 21 with holes 22 for securing the foot 20 to a foundation 40, a substantially vertical threaded rod 23 bearing a movable supporting element 24, comprising holes 25 for attachment to the outer wall 9.
- the supporting element 24 is vertically movable by means of a nut arrangement 26, interacting with the threaded rod 23
- Fig. 7 shows a perspective view of a horizontally extending support and attachment member 30 for attachment of a wheel track 32, not shown in this figure.
- the wheel track attachment member 30 is also shown in Fig. 2 and Figs. 10 to 12 , and it comprises a number of screw holes 31.
- the wheel track 32 is an optional, auxiliary equipment.
- Fig. 9 is seen a side view and a top view of a wheel track 32 having a mounting member 34 for attachment thereof to the attachment member 30. On the other side there is an anchoring member 35 for anchoring of the wheel track in the floor of the service place.
- the wheel track comprises a water tray 33 to collect waste water from the tires of a vehicle.
- Fig. 10 shows a perspective view of a portion of the service pit 1 shown in Fig. 1 provided with a wheel track 32
- Fig. 11 and 12 show in more detail the attachment of a wheel track 32 to the support and attachment member 30, where screws, (not shown), may be used to attach the housing member 34 by means of the holes 31, 39.
- Figs. 13 to 15 are shown three consecutive steps of an installation of the service pit 1.
- the service pit 1 has been positioned in a cavity in the ground, not shown, to stand on a foundation 40 and adjusted into its intended position by means of the adjustable feet 20.
- the pit 1 situated a predetermined distance above the foundation 40.
- a separate substantially vertical fill wall 41 is, as shown in Fig. 13 , attached to the foundation 40 adjacent the extension of both the outer walls 9.
- This fill wall 41 has a limited height, about 300-500 mm. Sufficiently high to reach above the level of the floor 70, but not higher than needed to fill the bottom region 43 and the corner area 18 of the pit 1. Then soil is refilled into the cavity outside of the fill wall 41 and up to its upper edge.
- fill material 42 such as concrete
- fill material 42 is supplied to the lower region 43 up to the upper edge 44 of the fill walls 41. This will provide the possibility for inspecting that filled material 42 has actually been supplied to all desired parts of the bottom region of the pit, since it will be easily detected visually that the fill material reaches the upper edge, at least adjacent the upper edge of the fill wall 41.
- Fig. 15 the final filling step is shown, where fill material 42 is supplied in to the hollow space 10 between the inner and outer walls 8, 9 to the top. This step will be performed after the fill material 42 in the lower region 43 has solidified, or at least to a certain extent.
Description
- The present invention relates to a service pit to be installed on a foundation and comprising a module, which have a metal support frame, e.g. steel, and have at least two longitudinal side walls and a bottom, where at least the side walls exhibiting an inner wall and an outer wall arranged at a distance from each other, said side walls, bottom and foundation bounding a hollow space. The invention also relates to a method for assembling the service pit according to the invention, and further it relates to a method for installing the service pit on a foundation in a space in the ground.
- Service pits of the above mentioned kind are known from e.g.
DE4324339 andDE4345415 , and are used in e.g. workshops for installation or maintenance of motor vehicles, hence the staff in a comfortable upright position may work under the vehicle. During installation of such a pit the hollow space between the side walls and between the bottom and the foundation is normally filled with a settable material, such as concrete and/or an isolating foam. In order to have the necessary strength to resist the pressure stresses to which the pit is subjected to, the known pits are made of relatively thick steel plates and having a relatively large distance of about 200 mm between their side walls. Thus, the known pits suffer from the disadvantage that a large amount of steel and also fill material have to be used to obtain the required strength. FromDE 20201310277 U1 there is known a special kind of service pit, i.e. to be installed hanging onto supporting walls instead of being installed on a foundation. Also a design as shown inDE 20201310277 U1 suffers from basically the same disadvantages as mentioned above, despite the fact that transversally extending, supporting T-beams are used to span the hollow space between the side walls and bottom walls. - Further, according to known prior art normally the outer wall of the pit extends all the way down to the foundation. Accordingly, the fill material will be filled into the hollow space bounded by the outer side walls, the inner side walls, the bottom and the foundation, implying difficulties in detecting desired filling in all parts of the hollow space, especially if the filling is performed in one step via an upper gap between said side walls, as described in the above cited prior art. Hence, there is a risk of air being trapped in the hollow space, especially in the bottom region, thus resulting in a weakened construction. In
DE-G-9320679 , which is a branch off fromDE4324339 , it is suggested to provide a longitudinally angled bottom section to minimize air trap risk, which however results in a complex structure leading to extra cost. Moreover, according to prior art methods it may be complicated to install supply channels, etc. (e.g. for ventilation, compressed air, electricity). - It is an object of the present invention to solve, or at least to minimise the above mentioned problems and to provide a service pit which exhibits the necessary strength while the amount of steel and/or fill material to be used is reduced.
- This is achieved by a service pit according to the claims. Hereby is achieved that at least the inner and outer walls may be made with a smaller thickness, hence reducing the amount of steel used. This is due to the rib plates make the service pit structure more rigid and thus stronger and easier to produce in a modularized manner, with minimized risk for trapped air. In addition, the thus reinforced service pit may be manufactured with less distance between the inner and the outer wall of the side walls, thereby reducing the required amount of fill material to be used.
- The ribs are made of plate material, preferably the same kind of metal plate as the inner and outer walls, e.g. 3 mm steel plate. The rib plates extend essentially perpendicular to the plane of the side walls extend over the whole hollow space and have the form of an U like the rib plates in a double-hulled vessel.
- In order to ensure a good and precise attachment of the rib plates to the inner walls, the rib plates are preferably provided with engagement means for cooperation with corresponding means provided in the inner walls. In a preferred embodiment said engagement means on the rib plates comprise protruding fitting members adapted to exactly fit in to corresponding recesses in the inner walls. In order to obtain high accuracy and precision the fitting members and recesses are preferably produced by the use of laser cutting, as well as the contours of the rib plates .
- To make the construction stronger the lower corners of the side walls may be provided at an obtuse angle relative to vertical, preferably about 45°. Further, the service pit may be provided with a horizontal longitudinal beam arrangement in the hollow space of the lower corner region. This facilitates a strong construction and enables a reduced width inside of the bottom part, which enables arranging path way for lifting devices in the pit that is only 1300 mm. In many pits there is a need of using 1500 mm, which requires more costly equipment.
- According to another aspect of the invention the service pit is assembled by a method comprising the steps as defined in
claim 11. - It is hereby obtained that the service pit structure is more rigid and thus stronger.
- The inner walls may be attached to the rib plates in any suitable manner, however it is preferred that the inner walls are attached to the rib plates by bringing engagement means on the rib plates in engagement with corresponding means provided in the inner walls. In a preferred embodiment protruding fitting members on the rib plates are introduced into corresponding recesses in the inner walls.
- According to yet another aspect of the invention the service pit is installed by a method comprising the steps as defined in
claim 14. - It is hereby obtained many advantages, e.g. that extra stability of the bottom region is provided, and that the space above the fill wall is kept freely available to enable arranging supply passages channels for ventilation etc. Further it is an advantage not to have to make any adjustment to the outer wall of the service pit in relation to the foundation, but instead use a separate fill wall that is easily accessible and handled. It also provides the advantages of enabling good control that the first filling step is performed in a desired and predetermined manner, by means of visibly checking that the level is optimal, i.e. when fill material everywhere reaches the upper edge of the fill wall. Furthermore is facilitates the use of a specific kind of fill material in the bottom region, which may be advantages in some applications.
- The service pit according to the invention may be pre-produced or it may be assembled on site.
- Further features and details of the service pit according to the invention will be apparent from the detailed description.
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Fig. 1 is a perspective view of a service pit according to one embodiment of the invention, -
Fig. 2 is a cross section view of the service pit shown inFig. 1 , -
Fig. 3 is a view of a rib according to a preferred embodiment of the invention, -
Fig. 4 is a perspective view of an inner wall , -
Fig. 5 is a perspective view of a beam arrangement, -
Fig. 6 is a perspective view of a floor plate, -
Fig. 7 is a perspective view of an attachment member for attachment of a wheel track, -
Fig. 8 is a view of an adjustable foot for adjusting the position of the service pit during installation, -
Fig. 9 is a side view and a view from above of a wheel track, -
Fig. 10 is a perspective view of a portion of the service pit inFig. 1 provided with a wheel track, -
Fig. 11 is a view of details for attachment of a wheel track to the service pit, -
Fig. 12 is a side view of the attachment of the wheel track inFig. 9 to the service pit by means of the attachment member inFig. 7 , -
Fig. 13 is a view of an installation step of the service pit inFig. 2 , where a separate substantially vertical fill wall is attached to the foundation in the extension of both the outer walls, -
Fig. 14 is a view of an installation step of the service pit inFig. 2 , where fill material is supplied to the lower region up to an upper edge of the fill walls, and, -
Fig. 15 is a view of an installation step of the service pit inFig. 2 , where fill material is supplied in to the hollow space between the inner and outer walls to the top. - The invention will hereinafter be described in more detail with reference to the appended drawings. The following description should be considered as preferred form only, and is not decisive in a limiting sense.
- In
Fig. 1 is shown a perspective view of aservice pit 1 according to one embodiment of the invention. In the shown embodiment theservice pit 1 comprisesseveral modules 3, each having twolongitudinal side walls bottom 7. Eachmodule 3, has a longitudinal length M of about 1800 - 3200 mm, more preferred 2400 mm. The reason why it is preferred to use modular lengths as mentioned above, is that it is preferred to use modules that are multiples of the basicbuilding module measurement 600 mm and that it from the perspective of other aspects with this kind of construction project is an advantage to use four times the basic modularity due to the fact that it will fit well into most existing production lines for producing the metal plates forming the inner 9 and outer 8 walls of thepit 1. - In
Fig. 2 it is shown that eachside wall inner wall 8 and anouter wall 9 arranged at a distance from each other, thus bounding aspace 10 them between.Fig. 2 , shows a cross section of the service pit shown inFig. 1 , further comprises a number of rib plates 11 (seeFig 3 ) being arranged transversally in thespace 10 and securely attached to at least the inner andouter walls rib plates 11 are made of the same kind of metal plate as theinner walls 8, preferably 2-6 mm steel plate (most preferred 2-4 mm) and extend perpendicular to the plane of the side walls over thewhole space 10, thus exhibiting the form of an U. Hereby the width (in the longitudinal direction of the service pit 1) of arib plate 11 substantially equals to the material thickness of arib plate 11. The distance between the rib plates is preferably the basic building module measurement, i.e. 600 mm. In some installations it is an advantage to supplement with support ribs (not shown) in parallel between each neighboring pair of therib plates 11, to assist in keeping the desired distance between the inner andouter walls floor plate 72. - As these
rib plates 11 make the service pit structure more rigid and thus stronger, the applied amount of steel may be reduced, because the inner and the outer wall of theside walls outer wall 9 of theside walls outer rib 11a, to abut the vertical edges of thewalls outer rib 11a is somewhat larger than the other,intermediate rib plates 11. - At the top of the
pit 1 there are arranged two parallel U-beams 51, which preferably span the whole length of thepit 1.Supporting distance members 50 extend transversally between the twobeams 51, as also liftingmembers 52. - As shown, the lower
outer corners 18 between theside walls rib plates 11 are provided at a first obtuse angle α relative to vertical, preferably about 110-135°, thus making the construction stronger. Theupper edge 71 of the rib plates 11 (seefig 3 ) are also provided at an obtuse angle β relative to vertical, which may be less obtuse than the first angle α, to have thefloor plates 70 inclined at an angle β relative to vertical, preferably about 95-105°, to allow liquid to collect in a preformedchannel 74 in thefloor plate 70, i.e. in the middle of the pit. The shownservice pit 1 is also provided with a horizontallongitudinal beam arrangement 19 in thelower corner region 18, which further contributes to a strong construction and enables a reduced width PW inside of the bottom part. It enables arranging a path way for lifting devices of reduced span width in the pit, e.g. that is only 1300 mm. In many pits there is a need of using 1500 mm, which requires more costly equipment. - The
service pit 1 is further shown to comprise astairway 12, which is positioned at anend wall 15 of theservice pit 1. -
Fig. 3 shows one rib half 11' of anU-shaped rib plate 11 according to the preferred embodiment of the invention, e.g. to provide for more easy transportation. As schematically indicated inFig. 3 each rib half 11' is provided with protrudingfitting members 13, preferably at least twofitting members 13 along theinner edge 61. Thesefitting members 13 preferably protrude about the same distance as the thickness of thewall 8 to be fitted there. Further, therib plates 11 are provided withholes 14, so that the amount of steel is reduced without appreciably compromising the strength of the construction. To facilitate the manufacturing of theU-shaped rib plates 11, these are preferably made of two identical rib halves 11', which may be welded together, thus making the rib plates symmetric, also facilitating use of the same plates for thewalls sides recess 72 forming one half of the space for mounting of the preformedchannel 74 in thefloor plate 70. The width of therecess 72 is preferably many times smaller than the width W of a rib half 11'. Preferred measures of arib half 11 is a height H of about 1700 - 2000 mm, a width W of about 800 - 900 mm, i.e. wherein the width W is about 40-60 % of its height H. The portion of therib half 11 spanning the major portion of the space between thewalls rib half 11, has a transversal width T that is about 80 - 120 mm. - Further
Fig. 3 indicates that at the outer periphery of therib 11 there is arranged a flange, preferably by bending the edge of the plate, which flange 60 (e.g. 20-30 mm wide) is used for attachment of theouter plates 9 to therib plates 11. Preferably this is achieved by using screws, more preferably self-threading kind, e.g. having premade holes in theflange 60 of about 5-6 mm and appropriate corresponding screws adapted to that hole size. Thanks to the use of screws an efficient manufacturing is achieved that also eliminates possible difficulties related to welding, e.g. facilitates the use of less corrosive metal plates (e.g. galvanized) that are more difficult to weld. In the preferred embodiment theinner plates 8 are made of conventional (black) steel plates that are relatively cheap and easy to weld, whereas on theouter walls 9 are made from galvanized plates. - In
Fig. 4 is shown is a perspective view of an preferred embodiment of an inner wall plate 8', which is provided withrecesses 16 adapted to exactly accommodate the protrudingfitting members 13 on therib plates 11, wherein preferably each inner wall plate 8' is arranged with a plurality of parallelly arranged rows ofrecesses 16, to enable fitting of a plurality of parallelly arrangedrib plates 11. In order to obtain high accuracy and precision thefitting members 13 and recesses 16 are preferably produced by the use of laser cutting. Therib plates 11 may similarly be attached to theouter walls 9. - In
Fig. 5 there is shown one piece of thebeam arrangement 19 used in thecorner area 18 of theservice pit 1. Thebeam 19 preferably has alength 1 that is larger than the modular width M, i.e. a width that is larger than 2,4 m, preferably a width that can span at least two modules, e.g. between 5-10 m. - In
Fig. 6 there is shown afloor plate 70, having acentral channel 74. The length of the floor plate is preferably the same as the length M of a module, e.g. 2400 mm. As can be seen there is preferably arranged an L-bend 72 adjacent the longitudinal outer sides of thefloor plate 70, which L-bends 72 are used to sealingly join thefloor plate 70 with the lower edge of theinner side wall 8, preferably by the use of welding. As shown, e.g. seeFig. 2 , the bottom of thechannel 74 is arranged to create runoff for liquid, to lead collected liquid to a drainage (not shown). As a consequence the depth of thechannel 74 varies in the longitudinal direction, which in turn results in the need of floor plates having a proportionally varied original/nominal width. Hence, the nominal width before bending it varies giving it a triangular form, which is being bent to the desired form having theedges 72 in parallel and achannel 74 with varying depth. - In the following some preferred production steps will be presented regarding the production of the pre- fabricated pit structure according to the invention. Firstly the upper U-shaped supporting
beams 51 will be positioned on to the floor and are accurately positioned in relation to each other by means of transversal support and distance members 50 (seeFig. 1 ). Some of thedistance elements 52 are specifically designed to be used for lifting and moving of thepit 1. - Thereafter a jig (not shown) is positioned on to the support beams 51. In the next step the
inner walls 8 will be correctly positioned by means of the jig (n.b., thepit 1 will be upside down during the prefabrication thereof). Now thebeam arrangement 19 is welded on to theinner plates 8 and thereafter also thefloor plates 70. In the next step therib plates 11 will be attached to thepit 1, by means of lifting eachrib half 11 in to position by the use of the inter fit between thefitting member 13 and recesses 16. Now the rib halves 11 are welded, preferably by means of intermittent welding, into connection with theinner walls 9, thefloor plate 70 and also to each other at the joining centrally positioned vertical edges. In the next step theouter plates 8 are fit on to the outer edges, i.e. theflange 60, of therib plates 11, e.g. by means of screws. -
Fig. 8 shows anadjustable foot 20 for adjusting the position of theservice pit 1 during installation. The shownadjustable foot 20 comprises abottom plate 21 withholes 22 for securing thefoot 20 to afoundation 40, a substantially vertical threadedrod 23 bearing a movable supportingelement 24, comprisingholes 25 for attachment to theouter wall 9. The supportingelement 24 is vertically movable by means of anut arrangement 26, interacting with the threadedrod 23 -
Fig. 7 shows a perspective view of a horizontally extending support andattachment member 30 for attachment of awheel track 32, not shown in this figure. The wheeltrack attachment member 30 is also shown inFig. 2 andFigs. 10 to 12 , and it comprises a number of screw holes 31. Thewheel track 32 is an optional, auxiliary equipment. - In
Fig. 9 is seen a side view and a top view of awheel track 32 having a mountingmember 34 for attachment thereof to theattachment member 30. On the other side there is an anchoringmember 35 for anchoring of the wheel track in the floor of the service place. The wheel track comprises awater tray 33 to collect waste water from the tires of a vehicle. -
Fig. 10 shows a perspective view of a portion of theservice pit 1 shown inFig. 1 provided with awheel track 32, andFig. 11 and 12 show in more detail the attachment of awheel track 32 to the support andattachment member 30, where screws, (not shown), may be used to attach thehousing member 34 by means of theholes - In
Figs. 13 to 15 are shown three consecutive steps of an installation of theservice pit 1. Thus, first theservice pit 1 has been positioned in a cavity in the ground, not shown, to stand on afoundation 40 and adjusted into its intended position by means of theadjustable feet 20. To have thepit 1 situated a predetermined distance above thefoundation 40. - A separate substantially
vertical fill wall 41 is, as shown inFig. 13 , attached to thefoundation 40 adjacent the extension of both theouter walls 9. Thisfill wall 41 has a limited height, about 300-500 mm. Sufficiently high to reach above the level of thefloor 70, but not higher than needed to fill thebottom region 43 and thecorner area 18 of thepit 1. Then soil is refilled into the cavity outside of thefill wall 41 and up to its upper edge. - Thereafter, as shown in
Fig. 14 , fillmaterial 42, such as concrete, is supplied to thelower region 43 up to theupper edge 44 of thefill walls 41. This will provide the possibility for inspecting that filledmaterial 42 has actually been supplied to all desired parts of the bottom region of the pit, since it will be easily detected visually that the fill material reaches the upper edge, at least adjacent the upper edge of thefill wall 41. - In
Fig. 15 the final filling step is shown, wherefill material 42 is supplied in to thehollow space 10 between the inner andouter walls fill material 42 in thelower region 43 has solidified, or at least to a certain extent. - There are several advantages thanks to this. Firstly it provides for extra stability of the bottom region, and secondly it keeps the space above the
fill wall 41 freely available to enable arranging supply passages channels for ventilation etc. - Further it is an advantage not to have to make any adjustment to the
outer wall 14 of the pit in regard to thebase plate 60, but instead use aseparate fill wall 41 that is easily accessible and handled. It also provides the advantages of enabling good control that the first fill stage is performed in a desired and predetermined manner, by means of visibly checking that the level is optimal, i.e. when fill material everywhere reaches the upper edge of thefill wall 41. Furthermore is facilitates the use of a specific kind of fill material in the bottom region, which may be advantages in some applications. - Many other variations are also possible, as will be readily understood by the person skilled in the ; art, within the scope of the appended claims.
Claims (15)
- A service pit (1) to be installed on a foundation (40) and comprising a plurality of modules (3), which have a metal support frame, e.g. of steel, and have at least two longitudinal side walls (5, 6) and a bottom (7), where at least the side walls (5, 6) exhibiting an inner wall (8) and an outer wall (9) are arranged at a distance from each other, said side walls, bottom and foundation bounding a space (10), comprising a plurality of rib members (11) being arranged transversally in the space (10) to securely attach said inner and outer walls (8, 9) and bottom (7) by means of said rib members (11), wherein the rib members (11) extend essentially perpendicular to the plane of the side walls (5, 6) and the rib members (11) extend substantially over the whole hollow space (10) and have the form of an U, characterized in that said rib members are in the form of rib plates (11) made of metal plate material having a thickness of 2-6 mm and a transversal width (T) spanning the major portion of the space between the inner and outer walls (8, 9) that is about 80 - 120 mm wherein the upper edges (71) in the bottom part (7) of said rib plates (11) are provided at an obtuse angle (β) relative to vertical.
- A service pit (1) according to claim 1, characterized in that centrally in between said obtuse angled upper edges (71) of the rib plates (11) is a channel portion arranged to house a preformed liquid channel (74) of a floor plate (70) of said bottom (7), to allow liquid to collect in said preformed liquid channel (74).
- A service pit (1) according to claim 1 or 2, characterized in that the rib plates (11) are made of metal plate material, preferably having a thickness of 4 mm or less.
- A service pit (1) according to claim 3, characterized in that the width of a rib plate (11) in a longitudinal direction of the pit (1) substantially equals to the material thickness of a rib plate (11).
- A service pit (1) according to claim 1, characterized in that the rib plates (11) are provided with engagement means (13) for cooperation with corresponding means (16) provided in the inner walls (8).
- A service pit (1) according to claim 5, characterized in that the engagement means (13) on the rib plates (11) comprise protruding fitting members (13) adapted to exactly fit in to corresponding recesses (16) in the inner walls (8).
- A service pit (1) according to claim 6, characterized in that the fitting members (13) and/or recesses (16) are produced by the use of laser cutting.
- A service pit (1) according to any preceding claim, characterized in that the outer edge of said rib plates (11) are arranged with an attachment flange (60), preferably a bent portion of the rib plates (11).
- A service pit (1) according to claim 1, characterized in that the lower edges of the rib plates are provided at an obtuse angle (α) relative to vertical, preferably about 110-135°.
- A service pit (1) according to claim 9, characterized in that the service pit is provided with a horizontal longitudinal beam arrangement (19) in each inner lower corner region (18), and which preferably interconnects floor plates (70) with the inner walls (8), more preferred wherein said beam arrangement (19) delimits a pathway (PW) for lifting equipment in the pit (1) providing a span width of less than 1500 mm wide.
- A method for assembling the service pit (1) as claimed in any of the previous claims 1-10 comprising the steps of,a) arranging two base frame members (51) in parallel a predetermined distance apart,b) attaching inner walls (8) on each side to said base frame members (51)c) attaching longitudinal beams (19) and a floor plate (70) to form a U with the inner walls (8),d) attaching rib halves (11) outside of the inner walls (8), longitudinal beams (19) and floor plate (70) and attaching them to form a number of substantially U-shaped rib plates (11) spaced equidistantly, extending substantially over the whole hollow space (10) and wherein the upper edges of the rib plates (11) are provided at an obtuse angle (β) relative to vertical, ande) attaching outer walls (9) to the rib plates (11).
- A method according to claim 11, characterized in that the rib plates (11) are attached to inner walls (8) by introducing protruding fitting members (13) on the rib plates (11) into corresponding recesses (16) in the inner walls (8).
- A method according to claim 11 or 12, characterized in that the assembly is modularized by means of having at least most plates of the inner (8) and outer (9) walls forming a module of a predetermined length (M) and using a plurality of interconnected modules to form said service pit (1), wherein preferably at least one of said longitudinal beams (19) and/or base frame member (51) have a length that is substantially larger than the length (M) of a module.
- A method for installing the service pit (1) as claimed in any of the previous claims 1-10 comprising the steps of,a) providing a cavity in the ground where the service pit (1) is going to be positioned,b) providing a foundation (40) for the service pit (1) to safely and rigidly stand on,c) arranging the service pit (1) on the foundation (40),d) adjusting the position of the service pit (1) to its intended position by means of adjustable means, such as adjustable feet (20), where the outer walls (9) are situated at a predetermined distance above the foundation (40),e) attaching a separate substantially vertical fill wall (41) to the foundation (40) in the extension of both the outer walls (9), where said fill wall (41) has a height sufficient to reach above level of a bottom plate (70) of the service pit (1), but not higher than needed to fill a bottom region (43) and a corner area of the service pit (1),f) supplying fill material (42) to the bottom region (43) up to an upper edge (44) of the fill walls (41),g) arranging attachments, such as supply channels for ventilation, compressed air, electricity, etc.,h) supplying fill material (42) in the hollow space (10) between the inner and outer walls (8, 9) to the top.
- A method according to claim 14, wherein soil is filled into the cavity outside of the fill wall (41) after step e) and that step h) is not proceeded with before it has been visually confirmed that said lower region (43) is fully supplied.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL17747864T PL3411544T3 (en) | 2016-02-03 | 2017-01-09 | Service pit and method for assembling and installing the service pit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1650128A SE541192C2 (en) | 2016-02-03 | 2016-02-03 | Service pit and method for assembling and installing the service pit |
PCT/SE2017/050013 WO2017135863A1 (en) | 2016-02-03 | 2017-01-09 | Service pit and method for assembling and installing the service pit |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3411544A1 EP3411544A1 (en) | 2018-12-12 |
EP3411544A4 EP3411544A4 (en) | 2019-10-16 |
EP3411544B1 true EP3411544B1 (en) | 2020-11-04 |
Family
ID=59499929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17747864.1A Active EP3411544B1 (en) | 2016-02-03 | 2017-01-09 | Service pit and method for assembling and installing the service pit |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3411544B1 (en) |
DK (1) | DK3411544T3 (en) |
PL (1) | PL3411544T3 (en) |
SE (1) | SE541192C2 (en) |
WO (1) | WO2017135863A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110159016B (en) * | 2019-06-26 | 2023-12-05 | 中国铁路设计集团有限公司 | Column type inspection pit of prefabricated adjustable rail top elevation |
CN114687448B (en) * | 2022-06-02 | 2022-09-02 | 清华大学 | Transfer beam, building structure and construction method |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9320679U1 (en) * | 1993-05-26 | 1995-02-02 | Balzer Heide | Assembly and repair pit |
DE4345415C2 (en) | 1993-05-26 | 1998-10-22 | Balzer Heide | Assembly and repair kit with steel cassette |
DE4324339C2 (en) | 1993-05-26 | 1996-03-28 | Balzer Heide | Assembly and repair pit and method for manufacturing the same |
DE29502845U1 (en) * | 1995-02-21 | 1996-08-08 | Jacobsen Horst Dipl Ing | Steel cassette for assembly pits |
DE29517991U1 (en) * | 1995-11-14 | 1996-06-20 | Jacobsen Horst Dipl Ing | Sliding cover for assembly pits and other floor openings |
DE20200785U1 (en) * | 2002-01-19 | 2002-05-16 | Jacobsen Horst | Assembly pit in pipe technology |
DE102009012047A1 (en) * | 2009-02-26 | 2010-09-02 | Hans Balzer | Assembly and repair facility |
DE202013102177U1 (en) * | 2013-05-17 | 2013-06-10 | Hans Balzer | Assembly and repair facility |
DE202013010277U1 (en) | 2013-11-13 | 2014-01-17 | Hermann Gocht | Universal adjustable gutter hook |
-
2016
- 2016-02-03 SE SE1650128A patent/SE541192C2/en unknown
-
2017
- 2017-01-09 PL PL17747864T patent/PL3411544T3/en unknown
- 2017-01-09 DK DK17747864.1T patent/DK3411544T3/en active
- 2017-01-09 EP EP17747864.1A patent/EP3411544B1/en active Active
- 2017-01-09 WO PCT/SE2017/050013 patent/WO2017135863A1/en active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
PL3411544T3 (en) | 2021-05-31 |
EP3411544A1 (en) | 2018-12-12 |
SE1650128A1 (en) | 2017-08-04 |
WO2017135863A1 (en) | 2017-08-10 |
DK3411544T3 (en) | 2020-12-21 |
SE541192C2 (en) | 2019-04-30 |
EP3411544A4 (en) | 2019-10-16 |
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