SU1395768A1 - Sinkable well - Google Patents

Abstract

The invention relates to the field of construction, can be used in the construction of subsidence wells in cramped conditions and eliminates the seizure of the well when diving near an existing structure. Drain well consists of walls 1 with vertical ribs, which are provided with metal plates. On the protrusion of the blade part 4, a sealing device 5 of a clay layer and a rubber grip is installed.

Description

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On the height of wall 1 between the edges in the lateral pressure zone j epefla4H from the foundation 8, additional sealing elements 9 are installed, forming together with the vertical ribs 2 and i walls. 1 cavity 10. Each cavity 10 via pipes 11 communicates with an autonomous source of supply of a thixotropic solution under pressure through the upper holes 12 and through the lower holes III with a pump for feeding cement slurry. The sealing element 9 consists of a supporting table rigidly attached to the wall, above which a clay lock is arranged, and an elastic chamber filled with clay paste is suspended from below. A rubber collar is provided to protect the sealing element. The number of Rus additional sealing elements is determined by the proposed dependencies. 1 hp f ls, 4 ill.

one

; The invention relates to construction ||: TWU and can be used in the construction of subsidence wells in cramped conditions.

The aim of the invention is to eliminate the seizure of the well when diving near an existing structure.

FIG. 1 shows a drain well, a vertical section; Fig, 2 is the same plan | FIG. 3 shows a sealing device; in fig. "4 - view A on; fig„ 2, an edge with a metal plate.

:, Drain well consists of walls | 1 with vertical ribs 25 which; Equipped with metal plates, 3; On the ledge of the knife part 4 there is a sealing element 5 made of clay 6 and a rubber cuff 7, and along the wall height between the ribs 2 in the side transfer zone pressure from foundation 8; additional sealing elements 9 are installed, forming together with vertical ribs 2 and walls 1 of cavity 10; Each cavity 10 is connected via pipelines 11 to an autonomous source of supply of a thixotropic solution under pressure m through the upper openings 12 and through the bottom 13 otverstrsh rast- voronasosom for feeding plugging.,

The sealing element 9 consists of a supporting table 14 rigidly attached to the wall, 1, over which a layer of clay 6 is laid, and a chamber 15 suspended from below, filled with clay paste,, D, n is fixed

element is provided with a rubber cuff 7.

The number of Rus sealing elements n depends on the depth

5s of the foundations of existing structures bf, the distance of the base of the foundations from the well d, the design depth of the blade part h and a certain ratio

fO

n- (фf + a)

n 7,

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five

where A, Q (((

 - the maximum allowable

the distance between the sealing elements at the height of the well.

The immersion well is carried out as follows. A soil core is developed inside the well and, as it is lowered, the thixotropic solution 16 is fed from above into the slot formed by the knife between the walls and the ground.

When the knife lip reaches the depth Z hf + d, corresponding to the upper boundary of the transmission zone of the horizontal pressure from the existing structure 8j in the cavity 10, formed by the first brown sealing elements 9, the seal on the knife 5 and the vertical ribs 2 with metal plates 3, 5 waters 11 through the holes 12 thixotropic solution with high pressure, which perceives lateral pressure from the weight of the soil and from the foundation B.

0

At this moment, the first Russian is compacted of the spruce elements 9 is located at a depth of at least 2 m from the surface,

and the rest Russes are above the surface

As the development of the soil first

The seal of the sealing elements 9 reaches the depth Z (d), and the second grade is immersed in the ground for at least 2 m, after which a thixotropic solution with increased pressure is supplied to the cavities 10 between these ruses 11 and so on until the well is loaded onto the design mark. Then, the cement slurry in cavity 10 is fed through the lower holes 13 using mortar pumps, and the thixotropic solution is removed from the cavities through holes 12

As an example of a specific embodiment, we consider a drop well with a diameter of 24 m, immersed in sandy loams at a depth of 16 m, the height of the blade part is -2 m. Near the well at a distance of d 2 m there is a foundation whose basement is recessed in blu 300 KPa sole load on the sole

8 vertical ribs with a pitch of 10 m are provided outside the walls of the well. Between the ribs in the transmission zone of the horizontal pressure of the soil from the foundation of the existing structure

the cell walls install additional sealing elements. On vertical edges, it establishes metal plates of CP 1 cm, protruding into the soil by 10 cm. The maximum allowable distance between the sealing elements in the height of the well is equal to

Part “with 5 +.

P 7 /

 PD

The required number of Rus for additional sealing elements is to be no less than; 16-2))

five

We therefore prishchcha two Rus, with the upper Rus set at the boundary of the side pressure transfer zone from the foundation at a depth of Z + 2 7M, and the distance between the Rus is set equal to A 1

(14-7) 3.5 ,, 5 m.

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50

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d

five

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five

Additional thickened sealing elements in the form of a metal table from channel No. 14 rigidly attached to the wall, above which a clay lock 50 cm high is arranged, and from the bottom is suspended elastic, the shell of polyethylene is filled with clay paste at 60-70% of the maximum volume , which allows the shell to change its shape under the action of increased pressure of the thixotropic solution and compress the cavity under TOLIKO1U1,

preventing the solution from leaking up, Sealing o. jeMeHT is protected by an apron from a conveyor belt.

Max1gma The ibHoe horizontal pressure transmitted to the well from the weight of the soil and foundations of the existing structure is 2.2 KN / m, which can be perceived by a thixotropic solution with a pressure of 2.2 atm. The total volume of the solution in an overpressure cavity is 21 m. During the construction period, this volume of solution is placed in a special tank, from which pumps are pumped through pipelines in the MeKijy cavity with the help of ShN-150 pumps. tsogo rusa

In comparison with the known, the proposed well allows, in the process of its immersion, to perceive horizontal pressure from the soil and foundations of the existing ones, which ensures reliable construction in confined conditions.

Claims (2)

Invention Formula 1a Dip well, immersed in a thixotropic shirt, including walls with vertical ribs, knife part with a ledge and a sealing element 5 on it, placed on it, so that, in order to avoid jamming during grinding close to the existing structure, it is provided with additional sealing elements, located in rusa along the height of the wall between the ribs in the transfer zones of the horizontal pressure of the soil from the basement of the existing structure, with the formation of cavities isolated from one another, The kagvda of which is connected to an autonomous 1: STEPS supply of a thixotropic solution, while the number of Rus of additional sealing elements is determined by the ratio P tiiliii-ll de h - design depth from the surface to the knife shoulder; Bf is the height of the transmission zone of the horizontal pressure of the soil from the basement of the existing building, defined by the depth of its foundation; d is the distance from the well to the bottom of the foundation of an existing structure; Fig2 l + d-2m is the maximum allowable distance between the sealing elements along the height of the well, and the ribs are provided with metal plates protruding into the ground. 2. The well under item 1, characterized in that each additional sealing element is made in the form of a rubber cuff and rigidly connected to the wall of the well of the supporting table, on which a layer of clay is laid and an elastic chamber suspended from the bottom of which is filled with clay paste. / 2 / BYA / j5 jE: siii fie.Z