NO128706B

NO128706B -

Info

Publication number: NO128706B
Application number: NO04321/70A
Authority: NO
Inventors: R Tuuha
Original assignee: Rauma Repola Oy
Priority date: 1969-11-13
Filing date: 1970-11-12
Publication date: 1974-01-02
Also published as: SE356485B; FI43967B

Description

Fremgangsmåte og anordning ved peling i løs grunn. Procedure and device for piling in loose ground.

Foreliggende oppfinnelse angår en The present invention relates to a

fremgangsmåte samt anordning ved peling i løs grunn, f. eks. myr, leire, sand og lignende, hvor drenering og fundamentering er besværlig. method and device for piling in loose ground, e.g. bog, clay, sand and the like, where drainage and foundations are difficult.

Oppfinnelsen, som har til formål å gjøre The invention, which aims to do

sådan peling særlig effektiv og lett å utføre, er av den art hvor det i grunnen neddrives et rør bestemt til etter neddrivningen å fylles med flytende betong og behandles på en sådan måte at pelens nedre del utvides til sidene og danner en utvidet fot, som hindrer pelen i å trenge videre ned i grunnen. such piling, which is particularly effective and easy to carry out, is of the kind where a pipe is driven into the ground, destined to be filled with liquid concrete after the driving, and treated in such a way that the lower part of the pile is extended to the sides and forms an extended foot, which prevents the pile in penetrating further into the ground.

Det hovedsakelig karakteristiske ved oppfinnelsen er at det i rørets nedre del før fyllingen med betong anbringes en til en elektrisk tennanordning tilsluttet sprengladning, som ved antennelse spren-ger rørets nedre del istykker så at en del av betongen trenger ut og bevirker den ønskede utvidelse av pelens fot. The main characteristic of the invention is that an explosive charge connected to an electric ignition device is placed in the lower part of the pipe before it is filled with concrete, which, when ignited, blows the lower part of the pipe to pieces so that part of the concrete penetrates and causes the desired expansion of the pile's foot.

Andre for oppfinnelsen karakteristiske trekk er beskrevet i det følgende. Other characteristic features of the invention are described below.

Oppfinnelsen skal beskrives nærmere nedenfor i tilslutning til hosstående skje-matiske tegning av et utførelseseksempel hvor: Fig. 1 viser et lengdesnitt gjennom en pel med sprengladning i den nedre ende, mens Fig. 2 viser pelen etter sprengningen. Ved utførelse av fremgangsmåten dri-ver man ned i den løse grunn 1 det nød-vendige antall rør 2 av den på tegningen viste type, som er lukket og tilspisset i den nedre ende ved at det nedre veggparti er forsynt med langsgående spalter så at det dannes fliker, som er bøyet innover mot hverandre og danner rørspissen 3. Etter neddrivningen anbringes i hvert rørs nedre ende en hensiktsmessig sprengladning 4, som gjennom ledninger 5 er tilsluttet en elektrisk tennanordning. Derpå fylles røret med betong 6 og sprengladningen 4 bringes til detonasjon, hvorved rørets nedre del sprenges istykker og utvides så at en del av betongen i røret trenger ut gjennom de dannede åpninger i rørveggen og danner en forholdsvis omfangsrik og med den øv-rige betong i røret sammenhengende betongkake 8. Når denne betongkake er størknet vil den hindre at røret trenger videre ned i grunnen når det belastes i den øvre ende f. eks. ved den i fig. 2 antydede bjelke 10, som er festet til røret ved hjelp av en til dette fastsveiset plate 9. The invention shall be described in more detail below in connection with the attached schematic drawing of an embodiment where: Fig. 1 shows a longitudinal section through a pile with an explosive charge at the lower end, while Fig. 2 shows the pile after the blast. When carrying out the method, the necessary number of pipes 2 of the type shown in the drawing are driven down into the loose ground 1, which are closed and tapered at the lower end by the lower wall part being provided with longitudinal slits so that flaps are formed, which are bent inwards towards each other and form the pipe tip 3. After driving down, place in the lower part of each pipe end a suitable explosive charge 4, which is connected through wires 5 to an electric ignition device. The pipe is then filled with concrete 6 and the explosive charge 4 is detonated, whereby the lower part of the pipe is blown to pieces and expanded so that part of the concrete in the pipe penetrates through the openings formed in the pipe wall and forms a relatively voluminous and with the rest of the concrete in the pipe continuous concrete cake 8. When this concrete cake has solidified, it will prevent the pipe from penetrating further into the ground when it is loaded at the upper end, e.g. at the one in fig. 2 indicated beam 10, which is attached to the pipe by means of a plate 9 welded to it.

Ved sprengningen vil de fliker 7, som danner spissen 3, bøyes utover og danne klør, som griper inn i og festner seg i den frembragte betongkake 8 som vist i fig. 2. During the blasting, the tabs 7, which form the tip 3, will bend outwards and form claws, which engage and fasten in the produced concrete cake 8 as shown in fig. 2.

Om ønskes kan det anbringes sprengladninger på flere steder i røret. Derved vil man oppnå at det ved sprengningen dannes omkring røret beliggende og med betongen i røret sammenhengende betong-kaker i forskjellige høyder i grunnen 1. Man kan også drive to eller flere pelings-rør, hvori anbringes sprengladninger og betong, ned i grunnen etter hverandre i samme hull. Sprengningen kan da hensiktsmessig foregå i flere etapper. Enn-videre kan det i bunnen av hvert rør anbringes armeringsjern, f. eks. i form av spiraler og/eller ringer og/eller kjettinger. Disse utførelser av oppfinnelsen er imidler-tid ikke vist på tegningen. If desired, explosive charges can be placed in several places in the pipe. This will achieve that, during the blasting, concrete cakes located around the pipe and connected to the concrete in the pipe are formed at different heights in the ground 1. You can also drive two or more piling pipes, in which explosive charges and concrete are placed, into the ground one after the other in the same hole. The blasting can then suitably take place in several stages. Furthermore, rebar can be placed at the bottom of each pipe, e.g. in the form of spirals and/or rings and/or chains. However, these embodiments of the invention are not shown in the drawing.

Claims

1. Procedure for loose bearing reason, e.g. bog, clay, sand and the like, where drainage and foundations are difficult, and where a pipe is driven into the ground intended to be filled with liquid concrete after the drive-in and treated in such a way that the lower part of the pile expands to the sides and forms an extended foot , which prevents the pile from penetrating further into the ground, characterized by the fact that, before filling with concrete, an explosive charge connected to an electric ignition device is placed in the lower part of the pipe, which, when ignited, blows the lower part of the pipe to pieces so that part of the concrete penetrates and causes the desired expansion of the pile foot.

2. Piling pipe for carrying out the method specified in claim 1, characterized in that the lower end part of the pipe is closed and shaped like a point.

3. Piling pipe according to claim 2, characterized in that the wall in the lower end part of the pipe is divided by longitudinal slits entering from the end of the pipe wall into tabs, which are bent inwards so that they close the lower end of the pipe and form said tip, which flaps are intended to be bent outwards by the detonation of the explosive charge and form claws, which serve as reinforcement for the expansion of the pile foot formed by the explosion.

4. Method according to claim 1 and using piling pipes according to claims 2 and 3, characterized in that rebar is placed at the bottom of each pipe in a manner known per se, e.g. in the form of spirals and/or rings and/or chains or the like intended to cooperate with said pipe tabs for strengthening the reinforcement of the pile foot.

5. Modification of the method specified in claim 1, characterized in that, in addition to the bottom of the pipe, explosive charges are also placed in the pipe at different heights to form several extensions of the pile located at different heights.