Manhole to be installed in the ground with a safety anchor and safety anchor for it

Abstract

The invention described relates to a manhole to be installed in the ground, intended for example to receive a fluid-conducting built-in fitting, such as a water meter, comprising a manhole wall enclosing the hollow manhole space, a safety anchor 10 being provided on the outer face of the manhole wall, projecting radially relative to the latter, projecting in at least one direction onto the seating surface of the manhole 1 and connected with a force take-up in the vertical direction with the manhole wall SW in order to engage in the earth surrounding the manhole 1.The safety anchor 10 encompasses the manhole wall SW over its circumference and is produced in the circumferential direction of the manhole wall SW, in several parts, in particular in two parts, the safety anchor parts 11, 12 intended to form the safety anchor 10 being clamped together and are shaped with regard to the contour oriented towards the manhole wall and their dimensions, in such a way that they act, when clamped together, at least in sections, with a prestress against the outer face of the manhole wall SW. Figure for abstract: 1.

Description

Title of the invention: Manhole to be installed in the ground with a safety anchor and safety anchor for it

[0001] The invention relates to a manhole to be installed in the ground, intended for example to receive a fluid-conducting built-in fitting, such as a water meter, comprising a manhole wall enclosing the hollow manhole space, a safety anchor being provided on the outer face of the manhole wall, projecting radially relative to the latter, projecting in at least one direction onto the seating surface of the manhole and connected with a force take-up in the vertical direction with the manhole wall in order to engage in the earth surrounding the manhole.

[0002] There are various applications which provide for the installation in the ground of manholes for installations, for example fluid-conducting installations.

[0003] Such fluid-conducting built-in fittings are, for example, water meters. In this case, such a sight glass is called a water meter sight glass.

[0004] When building conditions permit, water meters are placed inside the building to be supplied with drinking water.

[0005] In many cases, however, it is essential to install such a water meter outside the building, especially when the building to house such a built-in fitting does not exist, for example on sports grounds, in allotments, parks or cemeteries. A water meter inspection chamber is usually installed in the trench in which the water pipes pass or will be laid.

[0006] This means that the water meter sight glass will be placed upright with its base on the bottom of the trench excavation. In temperate latitudes, water pipes are generally laid at a depth of 1 to 1.2 m, given that it is assumed that this depth is frost-free.

[0007] Water meter boxes are available as prefabricated concrete elements as well as in the form of plastic boxes. Plastic boxes are, due to a lower transport weight, easier to handle than concrete water meter boxes, which also results in a reduction in transport costs.

[0008] The plastic water meter manholes can be adapted to the depth of the trench. According to a previously known configuration, provision is made for this purpose to assemble such a water meter manhole from several manhole modules mounted stacked on top of each other.

[0009] The height of these assembled water meter sight glasses is adjustable thanks to the number of modules used.

[0010] According to another configuration, such a water meter sight glass has on the upper side a section of corrugated pipe which can be adjusted on site to the desired height, by cutting out the section of corrugated pipe which is not needed.

[0011] Water pipe manholes of this type are also installed in the ground, where there is ground traffic, where the passage of vehicles or other loading of the manhole is expected. In such a case, a concrete collar is poured around the upper end of the water meter manhole as a foundation for a drive-over cover.

[0012] The covers are shaped to withstand the loads exerted by the passage of a vehicle. Typical load thresholds for such covers are 1.5 t, 12.5 t or 25 t.

[0013] Manholes of this type are also used without planning to integrate water-carrying fittings, for example as a vertical infiltration well.

[0014] These generally extend down to the level of the water table. To this extent, the term "manhole" used in the context of the present embodiments includes structures installed in the ground surrounded by a circular wall - the manhole wall -. Regardless of the intended use of such a manhole or its use, these are exposed to identical or at least similar loads.

[0015] For such manholes, typically made of plastic and closed by a cover, it turns out that they sink somewhat in the vertical direction when they are subjected to loads acting on the cover, for example in the context of the passage of a vehicle. When the level of the water table rises, such manholes also tend to lift under the effect of Archimedes' thrust.

[0016] The risk of such a manhole sinking exists even in the absence of significant loading from above, for example after an episode of significant rise in the water table, with gullies in whole or in part at the base of the water meter manhole. Such phenomena also occur when the materials surrounding the manhole, which have typically been compacted during its installation, are subjected to variable influences, are carried away by water or move in some other way over time. Both of these phenomena are undesirable and should be avoided as far as possible.

[0017] A displacement or offset of the manhole in the vertical direction must also be avoided in order to not exert any shear force on the pipes which engage in such a manhole, if it is for example shaped as a water meter manhole, in order to avoid loads of this type at the coupling sections.

[0018] Such manholes are known from the state of the art, made of a plastic material, which have one or more annular flanges molded thereon, projecting outwards in the radial direction.

[0019] Such a view is known, shaped as an inspection view of DE 16 09 143 A.

[0020] The purpose of the annular flanges is to act against the Archimedean pressure which is exerted on the inspection chamber.

[0021] The proportion of the overhang of these annular flanges is low. For this reason, this inspection chamber has several annular flanges arranged at a distance from each other in the vertical direction.

[0022] The same applies to a manhole equipped with taps, as described in WO 97 / 04203 AL

[0023] This manhole is intended to house a water meter. Unlike the state of the art stated previously, the manhole wall only has a single annular flange projecting outwards.

[0024] The problem of lifting under the effect of Archimedes' thrust of manholes installed in the ground does not only exist for manholes made of plastic, but also for manholes made of concrete, as they are used for example as access openings to sanitation channels.

[0025] Such a manhole is known from JP 2010-24751 A. This concrete manhole is installed in a road. Two safety anchor pieces are connected using brackets on the outer face of the manhole wall.

[0026] The safety anchor pieces protrude from the manhole, projecting perpendicularly relative to its vertical axis. This safety anchor composed of two safety anchor pieces serves to stabilize the position of the manhole in the event of liquefaction of the earth surrounding the manhole, for example following an earthquake.

[0027] The view revealed by this document has a sectional surface which narrows towards the access hole.

[0028] The safety anchor parts are arranged in the area of ​​the beginning of the narrowing towards the access hole. This manhole with its safety anchor is installed in a road in such a way that the upper face of the safety anchor simultaneously forms the foundation layer of the roadway.

[0029] The very tedious assembly of the safety anchor parts is considered to be a disadvantage.

[0030] Consequently, for this manhole known from JP 2010-24751 A, just as for the two other plastic manholes mentioned previously according to the state of the art, the implantation in the geological structure of the surrounding earth is necessary, because in the case of plastic manholes, the latter adapts to the shape of the manhole wall.

[0031] In the context discussed, the invention therefore aims to propose a manhole to be installed in the ground, intended for example as a water meter manhole, for which the safety anchor can not only be mounted with few means, but also whose height position relative to the vertical extent of the view can be adjusted to adapt to the structure of the surrounding earth.

[0032] This task is solved according to the invention thanks to a look of the type mentioned in the introduction, shaped to be implanted in the ground.

[0033] This inspection chamber, designed for example as a water meter inspection chamber, has a safety anchor which projects radially from the inspection chamber wall and which clearly overlaps the seating surface of the inspection chamber in at least one direction, however preferably in at least two directions, which are diametrically opposed to each other with respect to the hollow space of the inspection chamber.

[0034] The safety anchor or its safety anchor parts engage, after the manhole has been installed in the ground, in the earth surrounding the manhole and are therefore anchored in the ground in complete safety, especially with respect to vertical movements.

[0035] The safety anchor is connected to the inspection chamber by tightening with absorption of forces acting in the vertical direction.

[0036] Thanks to the safety anchoring parts of its safety anchor engaging in the surrounding earth, the gaze is fixed in the vertical direction.

[0037] The sections of the safety anchor engaging in the earth are typically integrated into the compacted materials surrounding the manhole.

[0038] The manhole is thus secured by the safety anchor against vertical movements occurring in the earth surrounding the manhole.

[0039] This prevents vertical movements of the manhole. The safety anchoring parts projecting radially from the manhole wall extend far enough beyond the seating surface of the manhole to ensure the desired anchoring.

[0040] This therefore also allows a configuration in which the manhole is executed in a cylindrical manner overall or at least usually in a largely cylindrical manner.

[0041] Traditional water meter manholes are sometimes used, the lower section of which, into which the fluid pipes are introduced, tapers conically upwards, in order to avoid lifting under the effect of Archimedes' thrust thanks to the conical wedging surface produced in this way in this section of the manhole.

[0042] However, the additional installation cavity thus provided has no use; on the contrary, it promotes uplift under the effect of Archimedes' thrust due to the larger cavity. However, it does not prevent sinking.

[0043] Such a configuration of the end section of the manhole, on the side of the excavation bottom, is possible, but is not necessary since a safety anchor is provided.

[0044] The overhang of the safety anchor or its safety anchor parts engaging in the earth may for example correspond to half or even more of the inner diameter, in the direction of the overhang.

[0045] The length of the overhang of the safety anchoring parts also depends on their configuration, and in particular on their radial extent as well as on the counter-stop surface acting in the vertical direction and made available by the latter.

[0046] If, for example, a collar is used as a safety anchor, it has a collar plate and therefore a closed or at least substantially closed anchor plate.

[0047] In such a configuration, these can, in order to prevent sinking and / or lifting of the manhole under the effect of Archimedes' thrust, be dimensioned significantly shorter than safety anchoring parts provided in the form of rods or profiles projecting in the radial direction of the manhole. In this sense, there are different possibilities for shaping such a safety anchor for the purpose of anchoring the manhole to the ground in the vertical direction.

[0048] The safety anchor of such a manhole to be installed in the ground can be connected to its manhole wall while remaining relatively close to the surface.

[0049] This can then diffuse the circulation charges into the earth, without such charges being directed over large viewing heights to its base.

[0050] In such a configuration of the safety anchor, a crown, located outside the opening of the manhole, which holds the cover, typically made of concrete, can be dimensioned significantly smaller, in order to absorb traffic loads efficiently and without damaging the manhole or its installation in the ground.

[0051] It may also be provided to position the safety anchor below the total height of the manhole.

[0052] The safety anchor is shaped so as to surround the inspection wall over its entire circumference.

[0053] A manhole anchor consisting, for example, of two manhole anchor parts can then be connected without any problem to the manhole by tightening the two safety anchor parts.

[0054] In such a configuration, it is advantageous to be able to mount such a safety anchor subsequently, even on manholes already installed in the ground.

[0055] For this purpose, it is sufficient to clear the view to the depth at which the safety anchor is to be mounted, for example 30 to 40 cm below the surface of the ground.

[0056] The connection with recovery of the forces of the safety anchor to the manhole is achieved by the fact that a safety anchor is composed of several parts which are assembled by clamping with each other and that due to the clamping, these act simultaneously with prestress against the outer face of the manhole wall.

[0057] Such a fixing with force absorption can furthermore be improved by a fixing by form complementarity, when the manhole has, projecting from its manhole wall, an outward stop which acts in the vertical direction, shaped for example in the manner of a flange. In order to absorb the forces exerted in the vertical direction, in the direction of the base of the manhole, the safety anchor is, in such a configuration, under such a stop and consequently in contact with it, bearing on it by its upper face.

[0058] In this configuration, the upper section of the manhole is then supported on the safety anchor. Such a stop can for example be provided by securing the assembly structures of two manhole modules which make up the manhole.

[0059] If the safety anchoring parts are shaped like plates, as is the case for example with a collar, these can be reinforced against bending stresses by fins projecting in the vertical direction.

[0060] These fins can be molded on one side or on two sides on such a plate.

[0061] In a preferred configuration, where the safety anchor is made in two parts, its safety anchor parts, therefore for example its collar parts, protrude relative to the manhole wall, in a direction diametrically opposite to the hollow space of the manhole.

[0062] The direction of the overhang of these safety anchoring pieces preferably extends perpendicular to the longitudinal extent of the trench.

[0063] Typically, the safety anchoring parts of a manhole shaped as a water meter manhole have a span greater than the width of a trench, which will then be made with a greater width only near the surface, where such a manhole must be used.

[0064] It is then advantageous that the earth under these safety anchoring pieces has not, at least in places, been loosened and that it therefore has its initial stability.

[0065] The tightening may be carried out on isolated safety anchoring parts in order to obtain the tightening with force recovery desired with the sight glass, using known tightening means, such as those used for large-scale assemblies, for example on barrels for closure with a cover.

[0066] Mounting using clamping bolts is also possible. These allow higher clamping forces to be exerted.

[0067] In this case, the safety anchoring parts to be secured each support, in accordance with an exemplary embodiment, on their faces oriented towards each other, a counter-stop lug, crossed by one or more clamping bolts. If tool-free clamping is envisaged, a clamping system composed of a strip which is tensioned using a lever can be provided.

[0068] The various safety anchoring parts can be tightened by a tightening ring equipped with such tightening means.

[0069] A manhole thus shaped makes it possible to mount between them, during a first step, the safety anchoring parts enclosing the manhole wall and, during a second step, to adjust the height of the safety anchor on the manhole before carrying out the final tightening on the manhole wall.

[0070] In a preferred design of such a manhole, the safety anchoring part(s) act against the envelope surface of the manhole wall, at least in places, by means of a multi-point contact which acts in the tightening direction.

[0071] The tightening direction in such a design is that in which the safety anchor parts are tightened together.

[0072] It is then sufficient to orient the components of such a safety anchor part, which produce the multi-point contact, according to a vector proportion in the tightening direction.

[0073] This results in a concentration of forces on the components of such a safety anchor, through which the multi-point contact occurs. These may, for example, be projections of such a safety anchor part, on the side facing the manhole wall.

[0074] Such multi-point contact can be achieved by means of additional parts mounted on a safety anchor part, for example by bolts cantilevered on the front surface of the safety anchor part, facing the manhole wall. When using bolts, it is provided in a development that these are adjustable in the length of their shank cantilevered relative to the front surface of the safety anchor part.

[0075] It is understood that the term "multi-point contact" used in the context of these embodiments does not strictly designate a point contact or support on the manhole wall. This term encompasses structures and / or parts, by which the contact surface of such a safety anchor part whose front face is oriented towards the manhole wall, is reduced at the level of its typically present manhole wall recess, relative to its contact surface, consequently such point contact designates by its nature a surface support.

[0076] Safety anchor parts with such multi-point contact not only have the advantage of thereby concentrating a concentration of the adjacent clamping force on the components of the safety anchor part responsible multi-point contact, which has a positive impact on the desired tightening with force recovery in the vertical direction of the manhole, between the safety anchor part and the manhole.

[0077] However, such a safety anchor part, i.e. the safety anchor assembled from several parts of this type, can also be mounted in accordance with its intended purpose, when the surface of the manhole cover has geometric irregularities, especially in the peripheral direction.

[0078] The components serving the multi-point contact of such a safety anchor part act appropriately on the sections of the manhole wall which are shaped particularly with dimensional stability with respect to such loads.

[0079] For a manhole with a circular envelope surface, this has, if its periphery is considered, identical stability at all locations. In many cases, however, such manholes do not have a circular cross-section, but have a roughly rectangular shape with rounded corners.

[0080] In such a configuration, the rounded corners are the locations exhibiting the greatest form stability with respect to radial forces acting from the outside. By shaping the viewport in this manner, the components of such a safety anchoring part, which provide point contact, will be provided in a preferred manner so that they act on these rounded corners.

[0081] The safety anchoring parts of such a safety anchor will be preferably shaped in such a way that the front surfaces facing each other are, even when they are connected to the manhole wall, separated from each other by a slot.

[0082] In this way, manufacturing tolerances in the diameter of such a manhole can be easily accommodated without loss of the applicable clamping force.

[0083] The invention is described below using exemplary embodiments with reference to the attached figures which show:

[0084] [Fig. 1] in side view, a manhole according to the invention to be installed in the ground,

[0085] [Fig.2] a top view of the manhole of [Fig. 1], used as a manhole water meter, with a pipe inlet,

[0086] [Fig.3] in vertical section, the water meter sight glass of [Fig.l], located in land, along the section line A - B of [Fig.2],

[0087] [Fig.4] another view according to the invention according to another configuration and

[0088] [Fig.5] a section through the manhole of [Fig.4], with a view facing downwards.

[0089] The manhole 1 shown in [Fig.l] is shaped like a water meter manhole. The view 1 of the example presented is made up of several view modules 2, 3, 4, 5.

[0090] The viewing modules 2, 3, 4, 5 are arranged on top of each other and connected to each other by connecting structures which engage with each other.

[0091] The module 2 at the very bottom has a base 6.

[0092] The peripheral walls of the inspection modules 2 to 5 form the annular-shaped wall of the inspection wall of the inspection chamber 1 to be installed in the ground.

[0093] The upper inspection chamber module 5 has an opening at the top for access to the hollow space of the inspection chamber and is closed by a cover 7. Inside the inspection chamber 1, the embodiment shown comprises a water meter fitting acting as a fluid-conducting built-in fitting.

[0094] The water meter itself is located under the cover 7 and can be easily read once the cover 7 is open.

[0095] The installation of the manhole 1 is done in a trench 8 dug in the earth, which, in this figure is only suggested using lines in dashes and dots. The manhole 7 is supported by its base 6 on the bottom of the excavation 9 of the trench 8.

[0096] The inspection modules 2 to 5 are made of a plastic material suitable for these uses, for example polypropylene.

[0097] In order to anchor the manhole 1 in the vertical direction, a safety anchor 10 is connected to the latter.

[0098] In the embodiment shown, the safety anchor 10 is composed of two safety anchor parts 11, 12, each made in the manner of a collar part.

[0099] The safety anchoring parts 11, 12 project radially from the outer face of the manhole wall SW.

[0100] In the embodiment shown, the safety anchor 10 is connected to the inspection module 3.

[0101] The radial extent of the safety anchoring parts 11, 12 is, in the embodiment shown, perpendicular to the longitudinal axis of the trench 8.

[0102] Consequently, the safety anchoring parts 11, 12 also engage in the ground further away from the manhole 1, when the manhole 1 is implanted in the ground.

[0103] The safety anchor parts 11, 12 constituting the safety anchor 10 are parts made of impact-resistant and in principle rigid plastic material, while nevertheless allowing low elastic deformation so that they do not crumble.

[0104] The safety anchoring part 11 consists of an anchoring plate 13, which is reinforced on its upper face by fins 14, also extending in the radial direction. The configuration of the safety anchoring part 11 with its anchoring plate 13 and the arrangement of its reinforcing fins 14 is visible in the top view on the inspection chamber 1 shown in [Fig.2].

[0105] The safety anchor part 11 has, on its side facing the manhole wall, a manhole wall recess 15, which is adjusted to the contour of the manhole 1.

[0106] The cross-sectional geometry of the inspection chamber modules 2 to 5 is substantially rectangular in shape with curved side surfaces and rounded corners. The side of the safety anchor part 11 facing the inspection chamber 1 has a corresponding contour.

[0107] On the side of the safety anchor part 11 facing the safety anchor part 12, clamping extensions 16 are molded onto the edge. By means of these and the recess 15 in the inspection wall, the safety anchor part 11 encompasses the inspection wall by a little less than 180°. At each free end of the clamping extensions 16 there is a clamping counter-stop 17, which is molded radially away from the inspection wall 1 to the clamping extensions 16.

[0108] The clamping counter-stops 17 are used to insert clamping bolts 18, in order to clamp the safety anchor part 11 with the other safety anchor part 12.

[0109] The safety anchor part 12 is constructed exactly like the safety anchor part 11. Therefore, the references of the identical parts are the same, and identified by the suffix “.1”. The safety anchor parts 11, 12 are arranged with their clamping counter-stops 17, 17.1 oriented towards each other, outside the inspection chamber 1 and are secured with clamping bolts 18.

[0110] In the embodiment shown, two clamping bolts 16 pass through the clamping counter-stops 17, 17.1 to be secured to one another. The clamping of the safety anchoring parts 11, 12 using the clamping bolts 18 results in a fixing with force recovery between the safety anchoring parts 11, 12 and the manhole wall.

[0111] For this reason, the safety anchoring parts 11, 12 encompass on the circumference, with their manhole wall recess 15 and the clamping extensions 16, 16.1 which are molded therein, the manhole wall of the manhole 1, while leaving however a clamping slot between each pair of clamping counter-stops 17, 17.1.

[0112] The clamping slot is identified in [Fig.l] using the reference 19. Due to this fixing with force recovery, the safety anchoring parts 11, 12 are firmly secured, while acting in the vertical direction, with the inspection module 3 and consequently with the entire inspection chamber 1.

[0113] Such a clamping slot 19 is present on both sides, between the clamping counter-stops 17, 17.1 (see [Fig. 2]). [Fig. 2] also shows the cover 7 in a top view.

[0114] This figure illustrates the effect on a large surface of the safety parts 11, 12 with their anchor plates 13, 13.1 in their vertical direction of action and therefore the secure fixing of the manhole 1 installed in the ground.

[0115] The safety anchoring parts 11, 12 extend radially, as shown in [Fig.l], and extend significantly beyond the seating surface of the lower inspection module 2.

[0116] The top view of [Fig.2] shows that the safety anchoring parts 11,12 also have a greater extent in the direction of the longitudinal extent of the trench 8 than the manhole 1 itself. The top view of [Fig.2] shows a water pipe 20, which as seen in [Fig.l] is introduced into the lower manhole module 2.

[0117] [Fig.3] shows manhole 1 implanted in the ground in a longitudinal section along the section line AB of [Fig.2].

[0118] The trench 8 is filled with compacted soil 21. The safety anchoring parts 11, 12, of which only the clamping counter-stops 17 of the safety anchoring part 11 are visible in this figure due to the section plane, are taken into the compacted soil 21. Due to the clamping amplitude of the safety anchoring parts 11, 12, visible in Figures 1 and 2, also taken into the compacted soil 21, as can be seen in [Fig. 3] from the clamping counter-stops 17, it can be clearly seen that the manhole 1 is securely anchored in the vertical direction in the earth formed by the soil 21. Above the compacted soil layer 21 is for example a layer of all-run 22, on which the plates 23 are placed.

[0119] In the embodiment shown, a concrete crown 24 is poured in the transition zone between the upper inspection module 5 and the inspection module 4 located below.

[0120] The radial extent of the concrete crown 24 is, as can be seen in [Fig.3], significantly smaller than the tightening amplitude by which the safety anchoring parts 11, 12 engage in the compacted soil 21.

[0121] In addition, the safety anchor 10 consisting of the safety anchor parts 11, 12 is located at a depth with sufficient compacted soil 21 acting as a counter-abutment on top, to which is added the soil structure above. This provides, thanks to the safety anchor parts 11, 12 sinking into the earth, an effective counter-abutment against a possible lifting of the manhole under the effect of a thrust.

[0122] [Fig.4] shows a perspective representation of another view 1.1. This is constructed on the principle of view 1 described in the previous figures.

[0123] Manhole 1.1 differs from manhole 1 only by the configuration of its safety anchoring parts 11.1, 12.1. For the rest, the previous embodiments concerning manhole 1 apply in the same way to manhole 1.1.

[0124] The two safety anchor parts 11.1, 12.1 are secured by two pairs of clamping bolts 25, each of which passes through a clamping bracket 26, 27, 26.1, 27.1 assigned to each safety anchor part 11.1, 12.1 (see also [Fig.5] top right).

[0125] The clamping brackets 26, 27, 26.1, 27.1 are connected to their respective safety anchor part 11.1, 12.1 by screw fasteners.

[0126] Each safety anchor part 11.1, 12.1 supports two clamping bolt supports 28, 28.1, 29, 29.1.

[0127] The clamping bolt supports 28, 28.1, 29, 29.1 each comprise a holding bracket 30 (shown only with the clamping bolt support 29), which is connected to the safety anchor part (here: the safety anchor part 12.1) by one of its legs. Its other leg has a female threaded bore, into which the female thread of a clamping bolt 31 inserted therein is engaged. The foot of each clamping bolt 31 of such a clamping bolt support 28, 28.1, 29, 29.1 acts with a prestress against the outer face of the manhole wall SW and is thus clamped thereto.

[0128] The rod of the clamping bolt 31 projects from the recess 15.1 of the inspection wall of the safety anchor parts 11.1, 12.1.

[0129] The clamping bolts 31 act against the sections of the manhole wall SW which, considered in the circumferential direction, have the smallest radius.

[0130] The cross-sectional geometry of the manhole 1.1 is substantially rectangular in shape, with rounded corners and faces, the radius of curvature in the corners being significantly smaller than in the side surfaces.

[0131] Therefore, these areas of the manhole wall SW shaped with a smaller radius constitute, from a shape point of view, the most stable areas with respect to the forces acting radially. In the embodiment shown, the clamping bolts 31 act with an angle of 45 degrees with respect to the longitudinal axis or

[0132] short of the section geometry of the manhole 1.1, so that the forces exerted are directed homogeneously towards the lateral surfaces connecting the corner curvatures.

[0133] This results in a multi-point support acting in the direction of tightening the safety anchor parts 11.1, 12.1 on the manhole wall SW, as is essentially evident from the safety anchor part 12.1, seen from above, in the sectional representation of [Fig.5].

[0134] The clamping bolts 31 of the clamping bolt supports 28, 28.1 assigned to the safety anchor part 11.1 act in a similar manner against the manhole wall SW.

[0135] Only the remaining gap between the inspection wall and the respective inspection wall recess 15.1, like the face of the respective safety anchor part 11.1, 11.2 facing the inspection wall SW, is dimensioned smaller.

[0136] This support arrangement is visible in the detailed representation of [Fig.5], top right, using the clamping bolt support 29.1.

[0137] In the embodiment shown in [Fig.4] and [Fig.5], the safety anchor part 11.1 is prepared to be connected to the safety anchor part 12.1 in such a way that with the connection of the clamping brackets 27, a rod 32 held on the underside of the safety anchor part 11.1 is simultaneously fixed to the safety anchor part 11.1.

[0138] The strip 32 projects beyond the front surface facing the safety anchor part 12.1 and thus forms, together with the bracket 27, a safety anchor part receptacle 33, into which the safety anchor part 12.1 can be inserted with an edge section.

[0139] In the same way, such a rod is assigned to the bracket 27.1 on the underside of such a safety anchor part 11.1. This facilitates the securing of the two safety anchor parts 11.1, 12.1, since the two safety anchor parts 11.1, 12.1 are already positioned towards each other in height relative to the vertical extent of the manhole 1.1, before they are secured by clamping on the manhole wall SW.

[0140] The invention has been described using exemplary embodiments.

[0141] The professional will recognize many other possibilities for implementing them, without it being necessary to describe them in more detail within the framework of these explanations.

[0142] List of landmarks:

[0143] 1, 1.1 Look SW Manhole wall

[0144] 2-5 Manhole wall

[0145] 6 Base

[0146] 7 Cover

[0147] 8 Trench

[0148] 9 Excavation bottom

[0149] 10, 10.1 Safety anchor

[0150] 11.11.1 Safety anchor part

[0151] 12, 12.1 Safety anchor part

[0152]

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164]

[0165]

[0166]

[0167]

[0168]

[0169]

[0170]

[0171]

[0172] 13, 13.1 Anchor plate 14 Fin 15, 15.1 Manhole wall recess 16 Clamping extension 17, 17.1 Clamping counter-stop 18 Clamping bolt 19 Clamping slot 20 Pipe 21 Soil 22 Run-of-mine layer 23 Plate 24 Concrete crown 25 Clamping bolt 26, 26.1 Clamping bracket 27, 27.1 Clamping bracket 28, 28.1 Clamping bolt holder 29, 29.1 Clamping bolt holder 30 Clamping bracket 31 Clamping bolt 32 Rod 33 Safety anchor housing

Claims

Claims

1. Manhole for installation in the ground, for example for receiving a fluid-conducting built-in fitting, such as a water meter, comprising a manhole wall enclosing the hollow manhole space, a safety anchor (10, 10.1) being provided on the outer face of the manhole wall, projecting radially therefrom, projecting in at least one direction onto the seat surface of the manhole (1, 1.1) and connected with a force absorption in the vertical direction to the manhole wall (SW) in order to engage in the earth (21) surrounding the manhole (1, 1.1), characterized in that the safety anchor (10, 10.1) surrounds the circumference of the manhole wall (SW) and is formed in the circumferential direction of the manhole wall (SW) in several parts, in particular in two parts, the parts (11, 12; 11.1, 12.1) safety anchor being, in order to realize the safety anchor (10, 10.1), clamped together and are shaped with respect to the contour facing the manhole wall and their dimensions in such a way that, when clamped together, they act at least in sections with a prestress against the outer face of the manhole wall (SW), which clamping of the safety anchor parts (11, 12; 11.1, 12.1) with each other has the effect of connecting the safety anchor (10, 10.1) with a force absorption to the manhole wall (SW), the safety anchor (10, 10.1) is designed in the form of a collar and the safety anchor parts (11, 12; 11.1, 12.1) have on their side facing the manhole a manhole recess (15), the manhole recesses (15) of the parts (11, 12; 11.1, 12.1) safety anchors being adjusted to the contour of the manhole (1, 1.1).

2. Manhole according to claim 1, characterized in that the two safety anchoring parts (11, 12) have on their faces oriented towards each other, counter-stops (17, 17.1) for clamping means, intended to secure the two safety anchoring parts (11, 12) to each other.

3. Manhole according to claim 1 or claim 2, characterized in that clamping bolts (18) are provided as clamping means.

4. Manhole according to one of claims 1 to 3, characterized in that the safety anchoring parts (11.1, 12.1) support on their face oriented with the manhole wall (SW) projecting elements in a vectorial proportion in the tightening direction, so that such a safety part (1.1, 12.1) is connected to the manhole wall (SW) with a take-up of forces in the tightening direction by the projecting elements, in the manner of a multi-point contact.

5. Manhole according to claim 4, characterized in that the projecting elements are produced by bolts (31) cantilevered on the contour of a safety anchor part (11.1, 12.1), oriented towards the manhole wall (SW).

6. Manhole according to claim 5, characterized in that the bolts (31) are adjustable in the length of their cantilevered rod relative to the front surface of the safety anchor part (11.1, 12.1), oriented towards the manhole wall (SW).

7. Manhole according to one of claims 4 to 6, characterized in that the projecting elements of the safety anchoring part(s) act against a section of manhole wall, which, considered in the circumferential direction, has the smallest radius.

8. Manhole according to one of claims 4 to 7, characterized in that the safety anchoring parts (11.1, 12.1) mounted together, when mounted together and secured with a force take-up on the manhole wall (SW), are at a distance from each other at their end surfaces oriented towards each other.

9. Manhole according to one of claims 1 to 8, characterized in that the manhole has a stop projecting outwards relative to the manhole wall, acting in the vertical direction and that the safety anchor is connected to the manhole under the stop, in contact with its lower face.

10. Manhole according to claim 9, characterized in that the manhole consists of several manhole modules arranged on top of each other and that such a stop is provided by at least one of the connecting structures resulting from the assembly of two manhole modules mounted on top of each other.

11. Manhole according to one of claims 1 to 10, characterized in that it has a base (6) and an opening on the top, acting as access to the hollow space of the manhole, that this manhole (1, 1.1) is intended to receive a conductive built-in fitting of fluids and in that the safety anchor (10, 10.1) supports on two diametrically opposite faces, safety anchor parts (11, 12, 11.1, 12.1) projecting from the manhole wall.

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