RU2254417C1 - Method and anchor system for securing pit bordering - Google Patents

Abstract

FIELD: building, particularly for bordering or stiffening the sides of foundation pits.

SUBSTANCE: method involves driving vertical piles in ground along pit perimeter for depth exceeding pit bottom level; excavating ground up to reaching pit bottom level to open bordering member surfaces facing inwards; securing horizontal distribution beams to above surfaces to create framing belt; installing spaced cross-pieces along pit perimeter; leaning the first cross-piece ends against distribution beams and securing the second ends thereof into pit bottom ground; removing cross-pieces after reinforced concrete pit bottom forming. Ground is excavated to form inner initial pit and then stepped trench is dug out under the protection of thixotropic mix along the initial pit perimeter in direction transversal to bordering formed by piles. Lower trench step is located below pit bottom level and the second cross-piece ends are secured to above step which is then concreted under the protection of thixotropic mix. After hardening support shoe of cross-pieces trench is filled with previously excavated ground and ground is excavated of the pit up to reacting pit bottom level.

EFFECT: possibility to consolidate pit just after the initial pit and framing belt forming.

3 cl, 2 dwg

Description

The invention relates to construction, in particular, to a method for attaching foundation pit barriers and to a structural design of a spacer system for a foundation pit enclosure constructed by the “wall in soil” method, or pipe or tongue barriers.

A known method of securing pit fencing, consisting in excavation to the bottom of the bottom of the pit with exposure of the inwardly facing surfaces of the fencing elements, fixing distribution beams located on the indicated surfaces of the fencing elements located in the horizontal direction to form the strapping belt, and installed at a distance from each other around the perimeter pit of spacers with abutment of one of their ends in distribution beams and fixing of their other ends in soil in the area of the bottom of the pit (US, No. 324 3963, E 02 D 17/0, publ. 04/05/1966).

From the same source there is a known spacing fence pit system containing a strapping belt made of beams arranged horizontally and fixed on the pit elements facing the pit walls, located at a distance from each other along the perimeter of the fence, braces, one end fixed to the beams banding belt, and to others - in soil in the area of the bottom of the pit,

This source of information is selected as a prototype for both declared objects.

The disadvantage of this method and the spacer system is that the formation of the fence is carried out only after separation of the pit to the design level, which is impossible if the formation of the pit is made in conditions constrained by the area and close to other buildings.

The present invention is aimed at solving the technical problem of making it possible to fasten foundation pit fences almost immediately after completing an internal pioneer pit and strapping belt device with the top of the mount resting on the strapping belt and the bottom of the mount immediately below the bottom mark.

The technical result achieved in this case is to reduce the time and simplify the technology for the production of pits, especially in conditions constrained by the area and close to other buildings.

The specified technical result for the first object is achieved by the fact that in the method of attaching pit fencing, which consists in excavating to the bottom of the pit bottom mark, exposing the surfaces of the fencing elements inward, fixing on the indicated surfaces of the fencing elements of the distribution beams located in the horizontal direction to form the strapping belt , and installing spacers at a distance from each other along the perimeter of the foundation pit with one of their ends resting on the distribution beams and by fastening their other ends in the soil in the area of the bottom of the pit, the fence is carried out by vertical immersion in soil along the perimeter of the pit of the pile elements to a depth below the level of the bottom of the pit, after diving into the soil of the pile elements, first excavation is carried out under the internal pioneer pit, and then along the perimeter of the pioneer pit under the protection of a thixotropic solution, a trench is torn off in a stepwise direction perpendicular to the plane of the fence formed by the pile elements with the depth of the location of the last open st fines of the trench below the bottom of the pit, the other end of the spacers is placed in the last step of the trench, which is concreted under the protection of the thixotropic mortar, after the strength of the support shoe of the spacers, the trench is filled with excavated soil and excavation is carried out from the pit to the design mark of the bottom of the pit, and the spacers are dismantled after the complete installation of the reinforced concrete bottom of the pit or when parallel work is carried out by grips on the device of the reinforced concrete bottom of the pit after curing Eton itself zahvatki.

The specified technical result for the second object is achieved by the fact that in the expansion system of the foundation pit enclosure containing a strapping belt made of beams arranged horizontally and mounted on the elements of the enclosure facing the foundation pit on the walls of the foundation pit, which are located at a distance from each other around the perimeter of the enclosure , with one end fixed to the beams of the strapping belt, and with the other in the soil in the area of the bottom of the pit, the braces are made in the form of pipes, equipped on the side located the area of the pit bottom, with support plates that are placed in a trench below the level of the pit bottom and concreted in it to the bottom of the pit bottom, and the strapping girders are fixed on the surfaces of the pile fence elements facing the pit vertically immersed in the ground around the depth of the pit to the depth of the pit below the mark of the bottom of the pit, while the braces in the form of pipes are made with the possibility of their dismantling after the device of the reinforced concrete bottom of the pit.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The present invention is illustrated by a specific example, which, however, is not the only possible, but clearly demonstrates the possibility of achieving the above set of features of the required technical result.

Figure 1 - design of the spacer enclosure system of the pit;

figure 2 is a view of figure 1.

According to the present invention, a method is proposed that allows fastening of foundation pit fencing almost immediately after the internal pioneer pit and strapping belt are installed with the top of the mount resting on the strapping belt and the bottom of the mount immediately below the bottom mark by 0.5-1.0 m. the pitch of the support braces will be 10-12 m with an estimated load of 150-200 tons. This method after unfastening allows you to immediately carry out excavation work up to the design level of the bottom of the pit, and work on the device in w / w of the bottom (meaning zahvatki). Especially rational is the application of this method when performing fences using the "wall in soil" method. That allows practically one mechanism to work both on the fence and in trenches for installing struts.

The method of attaching the pit fencing (Figs. 1, 2) consists in fencing by vertical immersion in the soil along the perimeter of the pit of the pile elements 1 to a depth below the mark of the bottom of the pit (reinforced concrete panels, pipes, tongue, etc.).

After immersion in the soil of the pile elements 1 with the formation of a wall-in-soil fence, first excavation is carried out under the internal pioneer pit (the mark of the pioneer pit is shown in figure 1 under pos. 3), and then they are torn off along the perimeter of the pioneer pit under the protection of the thixotropic mortar trench 4 stepwise perpendicular to the plane formed by the pile elements of the fence with the depth of the last open trench step below the mark of the bottom 2 of the pit.

Then fasten on the indicated surfaces of the elements of the fence, which are turned into the pit, a strapping belt consisting of distribution beams 5 located in the horizontal direction, after which they are installed at a distance from each other around the pit of the spacer 6 with one of the ends resting on the distribution beams 5, and the other ends are fixed in the soil in the area of the bottom of the pit. Spacers form a spacer system for fencing the pit.

In the expansion system of the foundation pit fence, which includes a strapping belt made of beams located in the horizontal direction and fixed on the pit elements facing the inside of the pit on the walls of the pit, the braces located at a distance from each other along the perimeter of the fence, fixed to the beams of the strapping belt at one end and for others - in the soil in the area of the bottom of the pit, that is, in the last stage 7 trenches, the struts are made in the form of pipes, equipped with a support, located on the side located in the area of the bottom of the pit, mi plates 8 which are placed into the trench at a level below the bottom of the pit 2. After placing the base plates in the trench, the latter is concreted under the protection of a thixotropic mortar to the bottom of the bottom of the pit for the formation of the reinforced concrete shoe 9. Moreover, the braces in the form of pipes are made with the possibility of dismantling after the installation of the reinforced concrete bottom of the pit.

Digging for the formation of a trench is carried out with a flat grab under the protection of a thixotropic solution. When this trench comes off stepwise, as shown in figure 1, perpendicular to the design of the fence with a step of 10-12 m

After the strength of the support shoe of the spacers is set, the trench is backfilled with local, excavated soil. Further, the work is carried out according to the usual scheme: they carry out excavation of the pit to the design level of 2 bottom of the pit bottom over the entire area of the pit or grapples for parallel work on the reinforced concrete bottom device. The spacers are dismantled after the reinforced concrete bottom of the foundation pit is completely installed, and in the case of work with grapples, after the concrete strength of the grab itself has gained strength.

The present invention is industrially applicable, since its implementation does not require other technologies than those that are widely used in pit developments.

Claims (2)

1. The method of attaching pit fencing, which consists in excavating to the bottom of the pit bottom mark with exposing the inwardly facing surfaces of the fencing elements, securing the distribution beams on the indicated surfaces of the fencing elements located in the horizontal direction to form the strapping belt, and installing them around each other around the perimeter pit spacers with the support of one of their ends in the distribution beams, and fixing their other ends into the ground in the area of the bottom of the pit, characterized We note that the fence is carried out by vertical immersion in soil along the perimeter of the pit of the pile elements to a depth below the bottom of the foundation pit, after immersion in the soil of the pile elements, first excavation is carried out under the internal pioneer pit, and then along the perimeter of the pioneer pit, under the protection of the thixotropic mortar, they tear off the trench stepwise perpendicular the plane of the fence formed by the pile elements with the depth of the last open trench step below the bottom of the pit, another C spacers are placed in the last stage of the trench, which is concreted under the protection of a thixotropic mortar, after the strength of the support shoe of the spacers is filled, the trench is backfilled with excavated soil and excavated from the pit to the design mark of the bottom of the pit bottom over the entire area of the pit, and the spacers are removed after the reinforced concrete the bottom of the pit, or when parallel work is carried out by grabs on the device of the reinforced concrete bottom of the pit after curing of the concrete of the grab itself. 2. An expansion system for excavating the pits, comprising a strapping belt made of beams arranged horizontally and fixed on the elements of the railing facing the walls of the excavation pit, which are located at a distance from each other along the perimeter of the fence, the braces, one end fixed to the beams of the strapping belt, and another - in the soil in the area of the bottom of the pit, characterized in that the braces are made in the form of pipes, equipped with side plates located on the side located in the area of the bottom of the pit, which they are placed in a trench below the level of the bottom of the pit and concreted thereto to the bottom of the bottom of the pit, and the beams of the strapping belt are fixed on the surfaces of the pile fence elements facing the inside of the pit, vertically immersed in the ground along the perimeter of the pit to a depth below the level of the bottom of the pit, in the form of pipes made with the possibility of dismantling after the device of the reinforced concrete bottom of the pit.

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