Joint system

Abstract

The present invention relates to a joint system for joining precast ground beams (205, 206, 207, 208) together. The joint system comprises a first joint part (101) for a first precast ground beam (205, 206) and a second joint part (102) for a second precast ground beam (207, 208), which joint parts (101, 102) can be locked together by using at least one locking pin (103, 104). The present invention also relates to a foundation for a building.

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a joint system according to the preamble of the appended independent claim. The invention also relates to a foundation comprising such a joint system.BACKGROUND OF THE INVENTION

[0002] Ground beams are widely used in construction industry for building foundations. Ground beams are elongated structural elements, typically constructed from reinforced concrete, that transfer loads imposed along their length to their end points where the loads are transferred to piles or pad foundations. Ground beams are typically arranged horizontally, and they may be used to support, for example, brick or block work. Ground beams may also be used at the edge of in situ manufactured concrete floor slabs, where they form permanent shuttering. Ground beams are typically square, rectangular, or L-shaped in cross section, and they can be designed to incorporate notches, end details and sloping faces.

[0003] An advantage of using ground beams is that they are quicker to install than conventional footings. Another advantage of using ground beams is that they allow uncertainties regarding ground conditions to be overcome. Ground beams also create a very accurate bearing level, reducing the amount of levelling up that is required prior to starting to build up a superstructure of a building.

[0004] Traditionally ground beams are constructed in situ, but the use of precast ground beams has increased during the last few years. Precast ground beams are cast to the required dimensions in an off-site factory from which they are transported to a building site. At the building site, the precast ground beams are lowered into place on top of piles or pad foundations, and then the precast ground beams are connected to each other and to the piles or pad foundations by filling the gaps between them with grout.

[0005] A problem associated with the known precast ground beams is that the joining of the precast ground beams together at a building site is difficult and time-consuming. Another problem associated with the known precast ground beams is the poor accuracy in joining the precast ground beams together.

[0006] Documents WO 92 / 14885 A1, WO 2008 / 128025 A1 and WO 2022 / 008892 A1 describe examples of known joints for connecting elongated concrete elements.OBJECTIVES OF THE INVENTION

[0007] It is the main objective of the present invention to reduce or even eliminate the prior art problems presented above.

[0008] It is an objective of the present invention to provide a joint system for joining precast ground beams together. In more detail, it is an objective of the invention to provide a joint system enabling to join precast ground beams together without using grout. It is a further objective of the present invention to provide a joint system enabling to join precast ground beams together in an easy and quick manner. It is yet a further objective of the present invention to provide a joint system enabling to accurately join precast ground beams together.

[0009] It is also an objective of the present invention to provide a foundation for a building that is easy and quick to install.

[0010] In order to realise the above-mentioned objectives, the joint system according to the invention is characterised by what is presented in the characterising portion of the appended independent claim. Advantageous embodiments of the invention are described in the dependent claims.DESCRIPTION OF THE INVENTION

[0011] A joint system according to the invention for joining precast ground beams together comprises a first joint part for a first precast ground beam, the first joint part comprising a bottom plate and an end plate attached perpendicularly to the bottom plate, and a second joint part for a second precast ground beam, the second joint part comprising an end plate, wherein one of the end plates comprises a first locking dowel and a second locking dowel and the other of the end plates comprises a first locking housing and a second locking housing, the first locking housing being arranged to receive the first locking dowel and the second locking housing being arranged to receive the second locking dowel when the end plates are arranged against each other, each of the first and second locking housings being provided with a first transverse hole and a second transverse hole and each of the first and second locking dowels being provided with a third transverse hole in such a manner that when the end plates are arranged against each other a locking pin can be arranged through the first, second and third transverse holes to lock the first and second joint parts together, and wherein the bottom plate comprises a hole for attaching the first joint part to an upper end of a pile or to a pad foundation.

[0012] The joint system according to the invention is meant for joining precast ground beams together. By a precast ground beam is meant an elongated precast structural element that can transfer loads imposed along its length to its end points where the loads can be transferred to piles or pad foundations. A precast ground beam is preferably installed horizontally on top of piles or pad foundations. Typically, a precast ground beam is constructed from reinforced concrete and has a square, rectangular, or L-shaped cross section. A precast ground beam can be designed to incorporate notches, end details and sloping faces.

[0013] The joint system according to the invention comprises two joint parts, each of which can be attached to a precast ground beam. Preferably, the joint part is attached to a precast ground beam during the casting of the ground beam. In other words, the joint part is preferably integrated to the precast ground beam. The joint part may comprise anchoring bars or the like by means of which the joint part is fastened to the precast ground beam. It is, however, possible to attach the joint part to a precast ground beam afterwards using suitable fastening means.

[0014] The first joint part is meant to be attached to the first precast ground beam. Preferably, the first joint part is attached to an end or side of the first precast ground beam. In the first joint part, the end plate is attached perpendicularly to the bottom plate. The end plate is preferably attached to the bottom plate by welding. The end plate can be arranged to an edge or close to an edge of the bottom plate. The first joint part may comprise more than one end plate attached perpendicularly to the bottom plate, wherein each of the end plates is arranged to a different edge of the bottom plate. The bottom plate can be placed on an upper end of a pile or on a pad foundation. The bottom plate is provided with a hole for attaching the first joint part with suitable fastening means to the upper end of the pile or to the pad foundation. The pile can be a steel or concrete pile.

[0015] The second joint part is meant to be attached to the second precast ground beam. Preferably, the second joint part is attached to an end or side of the second precast ground beam. The second joint part may comprise a bottom plate to which the end plate is attached perpendicularly. The end plate is preferably attached to the bottom plate by welding. The end plate can be arranged to an edge or close to an edge of the bottom plate. The second joint part may comprise more than one end plate attached perpendicularly to the bottom plate, wherein each of the end plates is arranged to a different edge of the bottom plate. The bottom plate can be placed on an upper end of a pile or on a pad foundation. The bottom plate can be provided with a hole for attaching the second joint part with suitable fastening means to the upper end of the pile or to the pad foundation.

[0016] The bottom and end plates of the first and second joint parts are preferably square or rectangular in shape. The length and width of the bottom and end plates can be, for example, 15-100 cm. The thickness of the bottom and end plates can be, for example, 2-50 mm. The bottom and end plates can, for example, be made of steel.

[0017] In the joint system according to the invention, the end plate of the first joint part and the end plate of the second joint part are meant to be arranged against each other when the first and second precast ground beams are joined together. The first and second locking dowels are located at one of the end plates and the first and second locking housings are located at the other of the end plates. In other words, the first and second locking dowels are located at the end plate of the first joint part and the first and second locking housings are located at the end plate of the second joint part, or vice versa.

[0018] The first and second locking dowels and the first and second locking housings are located at the end plates in such a manner that the first locking housing can receive the first locking dowel and the second locking housing can receive the second locking dowel when the end plates are arranged against each other. The first and second locking dowels are arranged to the end plate in such a manner that their longitudinal directions are perpendicular to the end plate. Each of the first and second locking housings comprises a cavity into which the locking dowel is received. The first and second locking dowels as well as the cavities in the first and second locking housings have preferably circular cross sections.

[0019] The length of the first and second locking dowels and the depth of the cavities in the first and second locking housings can be, for example, 20-100 mm. The diameter of the first and second locking dowels can be, for example, 20-100 mm. The diameter of the cavities in the first and second locking housings can be, for example, 25-105 mm. The first and second locking dowels and the first and second locking housings can, for example, be made of steel.

[0020] The first and second locking housings are provided with the first and second transverse holes. The first and second transverse holes of the locking housing are perpendicular to the longitudinal direction of the cavity, and they extend opposite to each other from the outer surface of the locking housing into the cavity. The first and second locking dowels are provided with the third transverse holes. The third transverse hole of the locking dowel is perpendicular to the longitudinal direction of the locking dowel, and it extends through the locking dowel.

[0021] The first and second transverse holes in the first and second locking housings and the third transverse holes in the first and second locking dowels are positioned in such a manner that when the end plates of the first and second joint parts are arranged against each other the first, second and third transverse holes are aligned with each other. This allows inserting a locking pin through all the first, second and third transverse holes to lock the first and second joint parts together. The locking pin can be inserted into place through the first transverse hole of the first locking housing.

[0022] The diameter of the first, second and third transverse holes can be, for example, 10-30 mm. The length of the locking pin can be, for example, 15-100 cm. The diameter of the locking pin can be, for example, 10-30 mm. The locking pin can, for example, be made of steel.

[0023] The first and second joint parts may comprise more than one end plate. Each of the end plates may comprise locking dowels and / or locking housings.

[0024] An advantage of the joint system according to the invention is that it enables to join precast ground beams together without using grout. Another advantage of the joint system according to the invention is that it enables to join precast ground beams together in an easy and quick manner. Yet another advantage of the joint system according to the invention is that it enables to accurately join precast ground beams together.

[0025] According to an embodiment of the invention each of the first and second locking housings is provided with a first guidance pipe arranged in alignment with the first transverse hole and a second guidance pipe arranged in alignment with the second transverse hole. The first guidance pipe is attached in connection with the first transverse hole and the second guidance pipe is attached in connection with the second transverse hole. The first and second guidance pipes of the first and second locking housings are aligned with each other. An advantage of the first and second guidance pipes is that they facilitate the insertion of a locking pin. The locking pin can be inserted into place through the first guidance pipe of the first locking housing.

[0026] The inner diameter of the first and second guidance pipes can be, for example, 10-30 mm. The outer diameter of the first and second guidance pipes can be, for example, 12-50 mm. The length of the first and second guidance pipes can be, for example, 2-80 cm. The first and second guidance pipes can, for example, be made of steel.

[0027] According to an embodiment of the invention the second guidance pipes of the first and second locking housings are connected to each other with a first connecting pipe. The ends of the second guidance pipes are preferably arranged inside the first connecting pipe. The first connecting pipe prevents concrete from entering the second guidance pipes during the casting of a ground beam. The length of the first connecting pipe can be, for example, 2-80 cm. The first connecting pipe can, for example, be made of plastic or rubber.

[0028] According to an embodiment of the invention each of the first and second locking housings is provided with a first guidance pipe arranged in alignment with the first transverse hole, and a second guidance pipe is attached between the first and second locking housings in alignment with the second transverse holes. In this embodiment the second transverse holes of the first and second locking housings are connected to each other with one second guidance pipe. The first guidance pipe is attached in connection with the first transverse hole. The first and second guidance pipes are aligned with each other. An advantage of the first and second guidance pipes is that they facilitate the insertion of a locking pin. The locking pin can be inserted into place through the first guidance pipe of the first locking housing.

[0029] The inner diameter of the first and second guidance pipes can be, for example, 10-30 mm. The outer diameter of the first and second guidance pipes can be, for example, 12-50 mm. The length of the first and second guidance pipes can be, for example, 2-80 cm. The first and second guidance pipes can, for example, be made of steel.

[0030] According to an embodiment of the invention the first guidance pipe of the second locking housing is closed at its outer end. The outer end of the first guidance pipe is the end that is not attached to the locking housing.

[0031] According to an embodiment of the invention the end plate that comprises the first and second locking dowels comprises a third locking dowel and a fourth locking dowel and the end plate that comprises the first and second locking housings comprises a third locking housing and a fourth locking housing, wherein the third locking housing is arranged to receive the third locking dowel and the fourth locking housing is arranged to receive the fourth locking dowel when the end plates are arranged against each other, each of the third and fourth locking housings being provided with a fourth transverse hole and a fifth transverse hole and each of the third and fourth locking dowels being provided with a sixth transverse hole in such a manner that when the end plates are arranged against each other a locking pin can be arranged through the fourth, fifth and sixth transverse holes to lock the first and second joint parts together.

[0032] The third and fourth locking dowels and the third and fourth locking housings are located at the end plates in such a manner that the third locking housing can receive the third locking dowel and the fourth locking housing can receive the fourth locking dowel when the end plates are arranged against each other. The third and fourth locking dowels are arranged to the end plate in such a manner that their longitudinal directions are perpendicular to the end plate. Each of the third and fourth locking housings comprises a cavity into which the locking dowel is received. The third and fourth locking dowels as well as the cavities in the third and fourth locking housings have preferably circular cross sections.

[0033] The length of the third and fourth locking dowels and the depth of the cavities in the third and fourth locking housings can be, for example, 20-100 mm. The diameter of the third and fourth locking dowels can be, for example, 20-100 mm. The diameter of the cavities in the third and fourth locking housings can be, for example, 25-105 mm. The third and fourth locking dowels and the third and fourth locking housings can, for example, be made of steel.

[0034] The third and fourth locking housings are provided with the fourth and fifth transverse holes. The fourth and fifth transverse holes of the locking housing are perpendicular to the longitudinal direction of the cavity, and they extend opposite to each other from the outer surface of the locking housing into the cavity. The third and fourth locking dowels are provided with the sixth transverse holes. The sixth transverse hole of the locking dowel is perpendicular to the longitudinal direction of the locking dowel, and it extends through the locking dowel.

[0035] The fourth and fifth transverse holes in the third and fourth locking housings and the sixth transverse holes in the third and fourth locking dowels are positioned in such a manner that when the end plates of the first and second joint parts are arranged against each other the fourth, fifth and sixth transverse holes are aligned with each other. This allows inserting a locking pin through all the fourth, fifth and sixth transverse holes to lock the first and second joint parts together. The locking pin can be inserted into place through the fourth transverse hole of the third locking housing. The diameter of the fourth, fifth and sixth transverse holes can be, for example, 10-30 mm.

[0036] According to an embodiment of the invention each of the third and fourth locking housings is provided with a third guidance pipe arranged in alignment with the fourth transverse hole and a fourth guidance pipe arranged in alignment with the fifth transverse hole. The third guidance pipe is attached in connection with the fourth transverse hole and the fourth guidance pipe is attached in connection with the fifth transverse hole. The third and fourth guidance pipes of the third and fourth locking housings are aligned with each other. An advantage of the third and fourth guidance pipes is that they facilitate the insertion of a locking pin. The locking pin can be inserted into place through the third guidance pipe of the third locking housing.

[0037] The inner diameter of the third and fourth guidance pipes can be, for example, 10-30 mm. The outer diameter of the third and fourth guidance pipes can be, for example, 12-50 mm. The length of the third and fourth guidance pipes can be, for example, 2-80 cm. The third and fourth guidance pipes can, for example, be made of steel.

[0038] According to an embodiment of the invention the fourth guidance pipes of the third and fourth locking housings are connected to each other with a second connecting pipe. The ends of the fourth guidance pipes are preferably arranged inside the second connecting pipe. The second connecting pipe prevents concrete from entering the fourth guidance pipes during the casting of a ground beam. The length of the second connecting pipe can be, for example, 2-80 cm. The second connecting pipe can, for example, be made of plastic or rubber.

[0039] According to an embodiment of the invention each of the third and fourth locking housings is provided with a third guidance pipe arranged in alignment with the fourth transverse hole, and a fourth guidance pipe is attached between the third and fourth locking housings in alignment with the fifth transverse holes. In this embodiment the fifth transverse holes of the third and fourth locking housings are connected to each other with one fourth guidance pipe. The third guidance pipe is attached in connection with the fourth transverse hole. The third and fourth guidance pipes are aligned with each other. An advantage of the third and fourth guidance pipes is that they facilitate the insertion of a locking pin. The locking pin can be inserted into place through the third guidance pipe of the third locking housing.

[0040] The inner diameter of the third and fourth guidance pipes can be, for example, 10-30 mm. The outer diameter of the third and fourth guidance pipes can be, for example, 12-50 mm. The length of the third and fourth guidance pipes can be, for example, 2-80 cm. The third and fourth guidance pipes can, for example, be made of steel.

[0041] According to an embodiment of the invention the third guidance pipe of the fourth locking housing is closed at its outer end. The outer end of the third guidance pipe is the end that is not attached to the locking housing.

[0042] According to an embodiment of the invention the end plate is arranged at a distance from an edge of the bottom plate.

[0043] According to an embodiment of the invention the distance between the end plate and the edge of the bottom plate is in the range of 1 mm to 20 mm.

[0044] According to an embodiment of the invention the joint system comprises anchoring bars attached to the locking housings and / or the locking dowels. The anchoring bars are used to fasten the first and second joint parts to the precast ground beams.

[0045] According to the invention the bottom plate comprises a hole for attaching the first joint part to an upper end of a pile or to a pad foundation.

[0046] The present invention also relates to a foundation for a building. The foundation according to the invention comprises a first precast ground beam, a second precast ground beam, and a joint system according to the invention. In the foundation according to the invention the first joint part is attached to the first precast ground beam and the second joint part is attached to the second precast ground beam.

[0047] An advantage of the foundation according to the invention is that it is easy and quick to install.

[0048] According to an embodiment of the invention the end plates of the first and second joint parts are arranged against each other, and a locking pin is arranged through the first, second and third transverse holes to lock the first and second joint parts together.

[0049] According to an embodiment of the invention the bottom plate of the first joint part is attached to a pile or a pad foundation. The bottom plate can be attached to the upper end of the pile or to the pad foundation by using reinforcement bars and grout. The bottom plate can be attached to the upper end of a steel pipe by welding.

[0050] According to an embodiment of the invention the first and second precast ground beams are made of reinforced concrete.

[0051] The exemplary embodiments of the invention presented in this text are not interpreted to pose limitations to the applicability of the appended claims. The verb "to comprise" is used in this text as an open limitation that does not exclude the existence of also unrecited features. The features recited in the dependent claims are mutually freely combinable unless otherwise explicitly stated.

[0052] The exemplary embodiments presented in this text and their advantages relate by applicable parts to the joint system as well as the foundation according to the invention, even though this is not always separately mentioned.BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figs. 1A-1Billustrate a joint system according to an embodiment of the invention, and fig. 2illustrates a foundation according to an embodiment of the invention. DETAILED DESCRIPTION OF THE DRAWINGS

[0054] Figs. 1A-1B illustrate a joint system according to an embodiment of the invention for joining two precast ground beams together. The joint system comprises joint parts 101 and 102 that can be locked together with locking pins 103 and 104. Each of the joint parts 101 and 102 can be attached to an end or side of a precast ground beam.

[0055] The joint part 101 comprises a bottom plate 105 and an end plate 106 that is attached perpendicularly to the bottom plate 105. The bottom plate 105 is provided with a hole 107 for attaching the joint part 101 with suitable fastening means to a pile or a pad foundation. The joint part 101 comprises locking housings 108, 109, 110 and 111, which are attached to the end plate 106.

[0056] The locking housing 108 is provided with transverse holes 112 and 113. A guidance pipe 114 is attached in connection with the transverse hole 112, and a guidance pipe 115 is attached in connection with the transverse hole 113. The locking housing 109 is provided with transverse holes 116 and 117. A guidance pipe 118 is attached in connection with the transverse hole 116, and a guidance pipe 119 is attached in connection with the transverse hole 117. The guidance pipes 115 and 118 are connected to each other with a connecting pipe 120. The transverse holes 112, 113, 116 and 117, the guidance pipes 114, 115, 118 and 119, and the connecting pipe 120 are aligned with each other.

[0057] The locking housing 110 is provided with transverse holes 121 and 122. A guidance pipe 123 is attached in connection with the transverse hole 121, and a guidance pipe 124 is attached in connection with the transverse hole 122. The locking housing 111 is provided with transverse holes 125 and 126. A guidance pipe 127 is attached in connection with the transverse hole 125, and a guidance pipe 128 is attached in connection with the transverse hole 126. The guidance pipes 124 and 127 are connected to each other with a connecting pipe 129. The transverse holes 121, 122, 125 and 126, the guidance pipes 123, 124, 127 and 128, and the connecting pipe 129 are aligned with each other.

[0058] The joint part 101 comprises anchoring bars 130 and 131. The anchoring bars 130 are attached to the locking housings 108, 109, 110 and 111, and the anchoring bars 131 are attached to the bottom plate 105. The anchoring bars 130 and 131 are used to fasten the joint part 101 to the precast ground beam.

[0059] The joint part 102 comprises an end plate 132 that is meant to be arranged against the end plate 106 when the joint parts 101 and 102 are joined together. The joint part 102 comprises locking dowels 133, 134, 135 and 136, which are attached to the end plate 132. The locking dowels 133, 134, 135 and 136 are provided with transverse holes 137, 138, 139 and 140, respectively.

[0060] The locking housings 108, 109, 110 and 111, and the locking dowels 133, 134, 135 and 136 are located at the end plates 106 and 132 in such a manner that the locking housing 108 can receive the locking dowel 133, the locking housing 109 can receive the locking dowel 134, the locking housing 110 can receive the locking dowel 135, and the locking housing 111 can receive the locking dowel 136 when the end plates 106 and 132 are arranged against each other. Each of the locking housings 108, 109, 110 and 111 comprises a cavity into which the locking dowel 133, 134, 135 or 136 is received.

[0061] The transverse holes 137 and 138 are arranged in the locking dowels 133 and 134 in such a manner that when the end plates 106 and 132 are arranged against each other the transverse holes 137 and 138 are aligned with the transverse holes 112, 113, 116 and 117. This allows inserting the locking pin 103 through the transverse holes 112, 113, 116, 117, 137 and 138 to lock the joint parts 101 and 102 together. The locking pin 103 is inserted into place through the guidance pipe 114.

[0062] The transverse holes 139 and 140 are arranged in the locking dowels 135 and 136 in such a manner that when the end plates 106 and 132 are arranged against each other the transverse holes 139 and 140 are aligned with the transverse holes 121, 122, 125 and 126. This allows inserting the locking pin 104 through the transverse holes 121, 122, 125, 126, 139 and 140 to lock the joint parts 101 and 102 together. The locking pin 104 is inserted into place through the guidance pipe 123.

[0063] The joint part 102 comprises anchoring bars 141, which are attached to the locking dowels 133, 134, 135 and 136. The anchoring bars 141 are used to fasten the joint part 102 to the precast ground beam.

[0064] Fig. 2 illustrates a foundation according to an embodiment of the invention for a building. The foundation comprises piles 201, 202, 203 and 204 that have been installed into ground, and precast ground beams 205, 206, 207 and 208 that have been joined together and placed on top of the piles 201, 202, 203 and 204. The precast ground beams 205, 206, 207 and 208 are joined together with four joint systems of figs. 1A-1B. The precast ground beams 205 and 206 are provided with joint parts 101 at both of their ends, and the precast ground beams 207 and 208 are provided with joint parts 102 at both of their ends. The joint parts 101 and 102 are locked together with locking pins 103 and 104. The bottom plates 105 of the joint parts 101 have been attached to the upper ends of the piles 201, 202, 203 and 204.

[0065] Only advantageous exemplary embodiments of the invention are described in the figures. It is clear to a person skilled in the art that the invention is not restricted only to the examples presented above, but the invention may vary within the limits of the claims presented hereafter. Some possible embodiments of the invention are described in the dependent claims, and they are not to be considered to restrict the scope of protection of the invention as such.

Claims

1. A joint system for joining precast ground beams (205, 206, 207, 208) together, the joint system comprising: - a first joint part (101) for a first precast ground beam (205, 206), the first joint part (101) comprising a bottom plate (105) and an end plate (106) attached perpendicularly to the bottom plate (105), and - a second joint part (102) for a second precast ground beam (207, 208), the second joint part (102) comprising an end plate (132), characterised in that one of the end plates (132) comprises a first locking dowel (133) and a second locking dowel (134) and the other of the end plates (106) comprises a first locking housing (108) and a second locking housing (109), the first locking housing (108) being arranged to receive the first locking dowel (133) and the second locking housing (109) being arranged to receive the second locking dowel (134) when the end plates (106, 132) are arranged against each other, each of the first and second locking housings (108, 109) being provided with a first transverse hole (112, 117) and a second transverse hole (113, 116) and each of the first and second locking dowels (133, 134) being provided with a third transverse hole (137, 138) in such a manner that when the end plates (106, 132) are arranged against each other a locking pin (103) can be arranged through the first, second and third transverse holes (112, 113, 116, 117, 137, 138) to lock the first and second joint parts (101, 102) together, and that the bottom plate (105) comprises a hole (107) for attaching the first joint part (101) to an upper end of a pile (201, 202, 203, 204) or to a pad foundation.

2. The joint system according to claim 1, characterised in that each of the first and second locking housings (108, 109) is provided with a first guidance pipe (114, 119) arranged in alignment with the first transverse hole (112, 117) and a second guidance pipe (115, 118) arranged in alignment with the second transverse hole (113, 116).

3. The joint system according to claim 2, characterised in that the second guidance pipes (115, 118) of the first and second locking housings (108, 109) are connected to each other with a first connecting pipe (120).

4. The joint system according to claim 2 or 3, characterised in that the first guidance pipe (119) of the second locking housing (109) is closed at its outer end.

5. The joint system according to any of the preceding claims, characterised in that the end plate (132) that comprises the first and second locking dowels (133, 134) comprises a third locking dowel (135) and a fourth locking dowel (136) and the end plate (106) that comprises the first and second locking housings (108, 109) comprises a third locking housing (110) and a fourth locking housing (111), wherein the third locking housing (110) is arranged to receive the third locking dowel (135) and the fourth locking housing (111) is arranged to receive the fourth locking dowel (136) when the end plates (106, 132) are arranged against each other, each of the third and fourth locking housings (110, 111) being provided with a fourth transverse hole (121, 126) and a fifth transverse hole (122, 125) and each of the third and fourth locking dowels (135, 136) being provided with a sixth transverse hole (139, 140) in such a manner that when the end plates (106, 132) are arranged against each other a locking pin (104) can be arranged through the fourth, fifth and sixth transverse holes (121, 122, 125, 126, 139, 140) to lock the first and second joint parts (101, 102) together.

6. The joint system according to claim 5, characterised in that each of the third and fourth locking housings (110, 111) is provided with a third guidance pipe (123, 128) arranged in alignment with the fourth transverse hole (121, 126) and a fourth guidance pipe (124, 127) arranged in alignment with the fifth transverse hole (122, 125).

7. The joint system according to claim 6, characterised in that the fourth guidance pipes (124, 127) of the third and fourth locking housings (110, 111) are connected to each other with a second connecting pipe (129).

8. The joint system according to claim 6 or 7, characterised in that the third guidance pipe (128) of the fourth locking housing (111) is closed at its outer end.

9. The joint system according to any of the preceding claims, characterised in that the end plate (106) is arranged at a distance from an edge of the bottom plate (105).

10. The joint system according to claim 9, characterised in that the distance between the end plate (106) and the edge of the bottom plate (105) is in the range of 1 mm to 20 mm.

11. The joint system according to any of the preceding claims, characterised in that the joint system comprises anchoring bars (130, 131, 141) attached to the locking housings (108, 109, 110, 111) and / or the locking dowels (133, 134, 135, 136).

12. A foundation, comprising: - a first precast ground beam (205, 206), and - a second precast ground beam (207, 208), characterised in that the foundation comprises a joint system according to any of the preceding claims, wherein the first joint part (101) is attached to the first precast ground beam (205, 206) and the second joint part (102) is attached to the second precast ground beam (207, 208).

13. The foundation according to claim 12, characterised in that the end plates (106, 132) of the first and second joint parts (101, 102) are arranged against each other, and a locking pin (103) is arranged through the first, second and third transverse holes (112, 113, 116, 117, 137, 138) to lock the first and second joint parts (101, 102) together.

14. The foundation according to claim 12 or 13, characterised in that the bottom plate (105) of the first joint part (101) is attached to a pile (201, 202, 203, 204) or a pad foundation.

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