A shoring structure for an excavation pit and a method for fixing the shoring structure

Abstract

A shoring structure for an excavation pit comprises two upright walls and a jack and elongated prop arranged serially between them. The jack can be extended from an initial state to an extended state and fixed in the extended state. The shoring structure is further equipped with a sealable reservoir positioned between one of the walls and the prop for holding a predominantly incompressible and liquid medium. The length of the reservoir is variable in the longitudinal direction of the prop, at least when empty.

Description

NL 35398VH A shoring structure for an excavation pit and a working method for fixing the shoring structure The present invention relates to a Shoring structure for an excavation pit, comprising two upright standing walls and a jack arranged serially between them and elongated stamp, where the mortar is extendable from a is transitioning from an initial state to an extended state and is fixable in the extended state. Such a stamping construction is known in the state of the art and is applied, for example, for the creating a construction pit, where the two upright walls retaining walls can be facing each other. The bracing and The jacks can be located between the retaining walls and these on maintain a fixed relative position. During the build-up of the the stamping structure will be installed after inserting the into the ground retaining walls these with the aid of the jack and the prop out of each card pushed by the jack from the initial state to the to move the extended state thereof. As a result, the to be under significant prestress, so that ground settlement on the outer sides of the retaining walls is avoided after widening of the soil between the retaining walls. In the extension in this state, the jack is fixed so that it does not continuously needs to be controlled. Subsequently, the ground between the retaining walls are being removed to create the construction pit. The force exerted on the jack and the punch can thereby increase sharply, in practice to, for example, 1,500 tonnes. The preloading during the initial pushing apart of the retaining walls are typically only 1020% of the final force after creating the construction pit. After the construction work, the stamp and the five can be installed. will be removed by releasing the pressure on the stamp take. If the jack is fixed in place by a locking mechanism, it appears it be difficult in practice to ensure the safeguarding due to the to remove the force. The force is then, for example, raised by the punch, which is usually made of steel, to cut through using a cutting torch. A purpose of the invention is to provide a jack construction for easy dismantling of the jack and the stamp relative to the upright walls. This goal is achieved with the full stamping construction according to the invention, whereby the stamp construction is further provided with one between one of the walls and the stamp on sets lockable reservoir for holding a in essentially an incompressible and fluid medium, whereby the length of the reservoir at least in its empty state in longitudinal direction of the stamp is variable. The stamping construction according to the invention offers the possibility to fill the reservoir when assembling it len with an incompressible and fluid medium, for example dry sand, then to close the reservoir and through by means of the mortar to spread the upright walls apart push, so that the walls together with the stamp, the mortar and the reservoir be pre-tensioned. Subsequently can the jack be fixed in the extended position, so that The relative position of the walls is maintained. Continued then the soil between the retaining walls can be removed, whereby the force exerted on the jack and the stamp will increase. For dismantling the shoring structure, can the reservoir be opened to get the liquid medium out pull, so that the reservoir is in the longitudinal direction of the stamp can be shortened due to the variable length in empty toe state thereof. As a result, the mortar no longer needs to be to be operated to relieve the tension on the stamp. The invention therefore has the advantage that the stamp, the jack and the reservoir from the walls in a simple manner can be disconnected. The reservoir can be designed in such a way that it un compressible and liquid medium upon opening the the lockable opening automatically slides out. To this end, the the underside, for example, is equipped with a lockable closure shutter. If the medium is not completely incompressible, will, during the pushing of the walls apart, the length of the reservoir can be shortened in length to a limited extent direction of the stamp to compress the medium slightly ren. A further advantage of the variable length of the reservoir is that the stroke of the auger can be relatively short due to the length of the reservoir in the longitudinal direction of the to adjust the stamp on it. This offers the possibility to a to use a relatively simple and inexpensive mortar. The auger and the reservoir can be in line are located of the stamp. The mortar is located, for example, between the reser see the stamp, but it is also possible that the reservoir is located between the stamp and the mortar. In a special version, the mortar comprises a longitudinally expandable space with an enclosure, which enclosure is provided with a connection for supplying a pressurized medium into space. The casing may be provided with two opposing ell side walls situated perpendicular to the longitudinal direction of the stand stamped and be movable relative to each other in the longitudinal direction of the stamp. Preferably, the side walls are movable relative to each other in such a way that their mutual the angle remains the same, for example parallel to each other, To withstand high loads, the side walls can be rigid, for example in the form of steel plates. It is also possible that the side walls are flexible. In that case, the flexible sidewalls can withstand rigid elements. menten, like steel plates, lie against each other. The side walls can be connected to each other by a flexible wall that, together with the side walls, the space around closes, for example, a tubular bellows or a rubber ring. In a special version, the flexible has wall in an accordion shape. In a preferred implementation form, the side walls connected to each other by a flexible wall that sa one encloses the space with the side walls, whereby the side walls and the flexible wall are made in one piece, for example via an injection molding process. The jack can be fixed in the extended position. are by the insertion of a from into the expandable space material to be hardened. Grout is an example of this. If after reaching the desired pressure the material is out hard, the mortar is in the extended state of the walls fixed. The hardened material effectively forms a safeguard of the mortar. Preferably, the reservoir has a housing with a wall movable along the length of the stamp. Here the length of the reservoir can be easily adjusted be varied. When the movable wall is against one of the side walls borders on or coincides with the mortar, becomes a compact construction realized. In a practical implementation, the housing comprises of the reservoir a tube with the movable wall inside and in which the mortar is also located. The tube can on one side have a fixed closure on one side and a on the other side variable closure, which is formed by the movable wall. The flexible wall of the jack can be in the extended position of the jack resting against the pipe. The flexible the wall can then also form a seal against leakage of the incompressible medium in the reservoir via a possible opening between the tube and one of the side walls of the jack which forms the movable wall of the reservoir. The reservoir and the auger can together provide a push form a body that is between the stamp and one of the is located on upright walls. The invention also relates to a process for fixing the stamping structure as described above wrote, comprising the following successive steps: place one after the other in series between the upright walls of the mortar in the initial state, the stamp and the reserve see, fill the reservoir with an incompressible and liquid medium, such as dry sand, fill the mortar with a medium to be hardened, such as grout, in such a way that the mortar is extended from the initial state to the extended state and curing of the medium to be cured. The reservoir can be thus be filled so thoroughly that for the step of filling the mortar, the mortar and the reservoir touching each other or almost touching know, so that the mortar only needs to make a short stroke of the initial state to the extended state. After the excavation pit excavation has been carried out between the upright walls and the work today, the pressure on the stamp can be applied. removed by emptying the reservoir, after which the stamp, the auger and the reservoir can be removed. By the jack under increased pressure with the out to fill the hardening medium, the upright walls can withstand the soil on the outer sides is pressed and the whole on be pre-tensioned. The invention will be further explained below to the hand of drawings, which are embodiments of the invention represent the thing very schematically. Fig. 1 is a perspective view of a part of an embodiment of a stamping construction according to the invention. Fig. 2 is a top view of the shoring structure. according to Fig. 1. Fig. 3 is a perspective view of a push body of the shoring structure according to Fig. 1 on larger dish. Fig. 4 is a top view of the one shown in Fig. 3 the pushing body of the shoring structure. Fig. 5 is a cross-sectional view along the line VV in Fig. 4. Fig. 6 is the same view as Fig. 4, but shows a thrust body of the stamping structure according to an alternative tive embodiment. Fig. 7 is a cross-sectional view along line VII VII in Fig. 6. Fig. 8 is an enlarged view along the line VIIIVIII in Fig. 7. Fig. 9 is an enlarged view along line IX IX in Fig. 7. Fig. 10 is a perspective view of a mortar. in the thrust body according to Fig. 6 in an extended state of the mortar. Fig. 11 is a cross-sectional view of the full mortar. gens Fig. 10. Fig. 12 is the same view as Fig. 10, but shows the mortar in its initial state. Fig. 13 is a cross-sectional view of the full mortar. gens Fig. 12. Figures 1 and 2 show part of a performance. form of a shoring structure 1 for an excavation pit according to the invention. The shoring structure 1 comprises retaining walls 2 in the shape of a sheet pile profile separating the construction pit from the surroundings separate. Along the inner sides of the retaining walls 2 are res 3 specific purlin beams installed, which are joined to each other coupled in order to a stamping frame along the inner perimeter of to form retaining walls 2. The stamping structure 1 further comprises elongated stamps 4, which in this case are executed as tubes with square flanges at opposite ends there of. The purlin beams 3 are supported by the props 4 against the retaining walls 2 pushed by means of jacks 5, which are located in respective pushers 6 are located. The pushers 6 be are located in line with the respective stamps 4. Fig. 1 shows that a combination of one of the voices fur 4 and one of the pushing bodies 6 itself between two opposite adjacent retaining walls 2 is located, while two of such like braces between two adjacent and at an angle to each other retaining walls 2 are located. In Fig. 35, one of the thrust bodies is 6 depicted in detail. The thrust body 6 comprises an outer tube 7 and a inner tube 8, which is telescopically extendable on the outside ste tube 7 fits. The inner tube 8 has a first end, which protrudes beyond the outer tube 7 and provided is from an end plate 9. The end plate 9 is attached to a flange of the attached corresponding stamp 4. This causes the inner tube 8 is in fact part of the stamp 4. A second end the of the inner tube 8 that is in the outer tube 7 is located, is also equipped with an end plate 10. In the outer tube 7 is located next to the end plate 10 of the inner tube 8 the auger 5 and a reservoir 12. The reservoir 12 is equipped with a lockable filler cap. ning 13 and a closable drain opening 14. The reservoir 12 can be filled with dry sand, but this can possibly be a be another incompressible and liquid medium. The mortar 5 is provided with two opposing pressure plates 15a, 15b which are connected to each other along their perimeter by a flexi flexible wall 16. The flexible wall 16 can, for example, be made of rubber that is filled against the pressure plates 15a, 15b canalized. The printing plates 15a, 15b can be made of steel. The flexible wall 16 makes it possible to the pressure plate to move at 15a, 15b relative to each other in the longitudinal direction of the stamp 4. The pressure plates 15a, 15b and the flexible wall 16 form an enclosure of an expandable space 17, which via a connection 18 in one of the pressure plates 15b can be filled with a material to be hardened under pressure, for example grout. The material to be hardened can be routed through a pipe 19 of supplied from the outside through the inner tube 8. The screw 5 is located between the re in the shown embodiment servo 12 and stamp 4 in line with stamp 4. The stamp 4, the mortar 5, and the reservoir 12 are therefore in series. positioned between retaining walls 2. One of the pressure plates 15b lies against the end plate 10 of the inner tube 8. Reservoir 12 is formed by the outer tube 7, an end plate 20 of the outer tube 7, one of the pressure plates 15a of the jack 5 and the flexible wall 16 of the auger 5. The reservoir 12 is on the side facing the stamp 4 is inverted, bounded by one of the printing plates 15a of the jack 5 and the flexible wall 16 which against the outer tube 7 rests when the space 17 of the jack 5 is under pressure state. The length of the reservoir is 12 in the longitudinal direction of the stamp 4 is variable due to the mortar 5 inside the outer ones to move tube 7 in the longitudinal direction of stamp 4, like this that at least the one pressure plate 15a of the mortar 5 which the reservoir 12 limits, is located in a different position. The end plate 20 of the end plate 20 situated opposite the one pressure plate 15a outer tube 7 is attached to one of the purlin beams 3. When the material to be hardened is under pressure in the space 17 between pressure plates 15a, 15b and the flexible wall 16 of the mortar 5 is inserted, the pressure plates 15a have 15b the tendency to move apart and the flexible wall 16 to press against the inside of the outer tube 7. As a result, the sand in the reservoir can 12, although mainly incompressible, be compressed a little and will the retaining walls 2 on either side of the prop 4 and the push body 6 be pushed apart from a first mutual position to a second mutual position. After reaching from the second mutual position, the supply of the output can hardening material are stopped and the material is removed hard, so that the auger 5 is secured in the extended position of that. The auger 5 is thus in the second relative position tie fixable. It is also possible to the space 17 in such a way fill so that retaining walls 2 are not pushed apart, but are only fixed in their relative positions. After the fixation the construction pit can be excavated and the time walls 2 exert a compressive force on the stamp 4, the jack 5 and the reservoir 12. In the shown configuration, the mortar is 5 between the reservoir 12 and the stamp 4 are located, but it is also conceivable that the reservoir 12 is between the auger 5 and the stamp 4 is located or that the reservoir 12 outside the thrust body 6 is located. From Fig. 5 it becomes clear that the mortar 5 is a rela forms a relatively simple part of the stamping structure 1. The Auger 5 has a relatively short stroke. Because the auger 5 on various locations within the outer tube 7 in length direction of the stamp 4 can be placed, the volume is of the reservoir 12 very flexible. For example, if a The same stamp 4 is used in a stamp construction. where a greater distance needs to be covered, the five can zel 5 according to Fig. 5 at a greater distance from the end plate 20 of the outer tube 7 be positioned and the space in the reservoir 12 be filled with a larger amount of sand filled before the material to be hardened is placed under pressure in the room 17 is being brought. When the stamp 4 and the pusher 6 of the time walls 2 must be disconnected, the drain opening can 14 of reservoir 12 be opened, so that the dry sand comes out runs and the inner tube 8 further into the outer tube 7 can be slid inwards to counter the pressure of the turn walls 2 on the auger 5, the reservoir 12 and the stamp 4 gone to take. Fig. 613 shows parts of an alternative from lining shape of the stamping structure 1. This embodiment has many similarities with the execution described above ring shape; corresponding elements are with the same reference figures indicated. Fig. 1013 shows the mortar 5 as seen as a separate component, in Figs. 12 and 13 in an initial state. and in Figs. 10 and 11 in an extended state. The mortar 5 is in this version made from a flexible material. The Pressure plates 15a, 15b are also flexible and are located on the outside. ste tube 7 of the thruster 6 against respectively the end plate 20 of the outer tube 7 and an opposite one rigid plate 21 attached. Plate 21 is in the longitudinal direction of the outer tube 7 movable relative to the outer pipe 7 and forms a wall of the reservoir 12. A The opposite wall of reservoir 12 is formed by the end plate 10 of the inner tube 8. The flexible wall 16 of the mortar 5 has an accordion shape, so that the pressure plates 15a, 15b in both the initial state and the extended application be parallel to each other. The mortar 5 has two connections 18 which radially through the outer tube 7 to protruding outwards to fill the space 17 with an out material to be hardened or the de-aeration of the space 17 during filling. In Fig. 7 it can be seen that the reservoir 12 in this configuration is located between the auger 5 and stamp 4 is located. The invention is not limited to those in the drawings displayed and above-described embodiments that on various ways within the framework of the invention can are varied.

Claims

1. A shoring structure (1) for a construction pit, to encompassing two upright walls (2) and one between them serially arranged mortar (5) and elongated stamp (4) where at the screw (5) can be extended from an initial state to an extended state and fixable is in the extended state position, characterized by the fact that the stamp construction (1) is further provided with a between one of the walls (2) and the stamp installed lockable reservoir (12) for holding a essentially incompressible and liquid medium, whereby the length of the reservoir (12) at least in empty state there which is variable in the longitudinal direction of the stamp (4).

2. A stamp construction (1) according to claim 1, where the stamp (4), the mortar (5) and the reservoir (12) are arranged in series.

3. A stamp construction (1) according to claim 2, where the auger (5) and the reservoir (12) are in line are located of the stamp (4).

4. A stamp construction (1) according to one of the previous conclusions, where the mortar (5) is between the reservoir (12) and the stamp (4) are located.

5. A stamp construction (1) according to one of the previous conclusions, where the mortar (5) is lengthwise direction of the stamp (4) expandable space (17) with a envelope (15a, 15b, 16) includes, which envelope (15b) is for seeing a connection (18) for the in space (17) supplying a medium under pressure.

6. A stamp construction (1) according to claim 5, where the casing is provided with two opposing empty side walls (15a, 15b) perpendicular to the longitudinal direction of the stamp (4) stand and are movable relative to each other are in the longitudinal direction of the stamp (4).

7. A stamp construction (1) according to claim 6, where the sidewalls (15a, 15b) are rigid.

8. A stamp construction (1) according to conclusion 6, where the side walls (15a, 15b) are flexible.

9. A stamp construction (1) according to one of the conclusion 68, where the sidewalls (15a, 15b) are with each other connected by a flexible wall (16) which together with the side walls (15a, 15b) enclose the space (17).

10. A stamp construction (1) according to claim 9, where the flexible wall (16) has an accordion shape.

11. A stamp construction (1) according to claim 8, where the side walls (15a, 15b) are connected to each other by a flexible wall (16) which together with the side walls (15a, 15b) encloses the space (17), with the side walls (15a, 15b) and the flexible walls (16) are made from a single piece.

12. A stamp construction (1) according to one of the conclusions 511, with the mortar (5) in the extension The position can be fixed by the expandable space (17) insertion of a material to be cured.

13. A stamp construction (1) according to one of the previous conclusions, where the reservoir (12) a housing sing (7, 10, 20, 21, 15a, 16) has with a in the longitudinal direction of the stamp (4) movable wall (15a, 21), which extends perpendicular to the longitudinal direction of the stamp (4) stretches.

14. A stamp construction (1) according to claim 13 and one of the conclusions 612, where the movable wall at one of the side walls (15a) of the screw (5) borders or is connected to it coincides 15. A stamp construction (1) according to claim 13 and 14, where the housing of the reservoir (12) is a tube (7) includes with the movable wall therein (15a, 21) and in which where the mortar (5) is also located.

16. A stamp construction (1) according to one of the claims 911 and claim 15, regarding the flexible wall (16) of the mortar (5) in the extended position of the mortar (5) lies against the pipe (7).

17. Procedure for fixing the stamp construction in accordance with one of the preceding claims, comprising the following consecutive steps: between standing upright the walls (2) placing the jack (5) in series behind each other in the initial state, the stamp (4) and the reservoir (12), fill the reservoir (12) with an incompressible and liquid medium, such as dry sand, fill the mortar (5) with a medium, such as dry sand harden medium, such as grout, such that the mortar (5) becomes extended from the initial state to the extended state and curing of the medium to be cured.

18. Method according to claim 17, whereby the five self (5) under increased pressure with the medium to be hardened 5 is filled. Fig.11 / 726341454 Fig.22 / 76 4 36 4 3 Fig.43 / 7Fig.3V1320697820 13 6 7 8 9 Fig.54 / 720 13 12 5 16 18 7 6 19 8 914 15a 15b 1017 5 / 7 18 6 7 8 VII 20 18 Fig. 6 15b 6 10 13 7 VIII IX 8 16 5 17 20 12 VIII 21 15a IX Fig. 7

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