Drilling reinforced concrete column and method of construction

 

The invention relates to the field of construction in cramped conditions. Reinforced concrete column, consisting of the upper bearing and the lower base parts, includes seminolecounty concrete reinforcement cage and mortgage details. What is new is the fact that the column is made in a non-removable formwork with equivalent maximum external diameter of the reinforcement cage dk< Dcthe value ofdetermined from the relationship and fixtures placed in the upper bearing part of the column in the levels of markers of a base plate and marks slabs and made in the form of closed loops with ribs, the lower part of the column equipped with a bottom-hole camera and clamps. The method of construction of the drilling concrete columns includes the steps of manufacturing the column with concrete inserts concrete placement, permanent formwork in a project position in the borehole to be monolithic. The new method is that the column is carried out from the upper bearing part and the lower base part, and well Buryats diameter DcDto+2g+2+20,1 Dcvertically center to compensate for the eccentricity and fix the upper part of the horizontal displacement vertically lowered to the base of the well with fixing the lower part of the fixing devices zamonolichivajut concrete from the bottom up the lower Foundation part of the column and the inner part of the permanent formwork upper bearing part of the column. The technical result of the invention is to improve the vertical accuracy when installing the supporting Foundation and structural design of a building or structure elements and the construction of buildings, structures simultaneously up and down to below zero. 2 S. and 4 C.p. f-crystals, 5 Il.

1. The technical field,

The invention relates to the construction, especially in cramped conditions, in particular to the elements and methods of monolithic construction elements of buildings and structures, namely the reference concrete elements.

2. The level of technology

A device for transmitting pressure to the underlying dense soil layers formed by filling with concrete drilled wells /Short Polytechnical dictionary. - Moscow: GOS.ed. technical-theoretical literature, 1956, S. 830, Ref. "The pile,"/.

It is known device in the: State.ed. technical-theoretical literature, 1956, S. 429, Ref. "Column"/.

Famous columns with the elements of the pair in the levels overlap, completed with the formation of shells and columns not only circular but square /Pat. Of the Russian Federation No. 2197578, IPC (7) E 04 1/18, 2000/.

For columns of arbitrary cross-section hallmark can serve as the equivalent diameter is the maximum distance from the geometrical center of the cross section of the column to the curve of the second order (circle, ellipse and others), described around the points of the contour of the cross section of the column /Bronstein, I. N., Semendjajew K. A. Handbook of mathematics. - M.: Publishing House. The physics and mathematics literature, 1962, S. 167, 219, 428/.

Known reinforced concrete bearing containing seminolecounty concrete skeleton, including fittings and communication (U.S. Pat. OF THE RUSSIAN FEDERATION NO. 2094575, IPC (6) E 04 5/01, E 04 1/16, 1991).

Most similar in its essence and the achieved technical result in part of the device is reinforced concrete column, comprising seminolecounty concrete reinforcement cage and embedded parts consisting of the upper bearing and the lower base parts (see, for example, MAMELUK N. With. and other Piles and pile foundations, Kiev, Budivelnik, 1977, S. 49-51).

The known method of erection of the columns is of the frame elements (RU Application No. 99118847/03, 2001, E 04 1/16 IN).

Known also adopted by the applicant for the closest analogue (prototype in terms of method) is a method of construction of the drilling concrete columns, comprising operations of manufacturing columns with embedded items, concreting in permanent formwork in a project position in the borehole with monolithic (jurkiewicz P. B. "Drilling columns - a new reality." //"The underground world", 2001, No. 4, S. 12-21, ISSN 0869-799X, TIMRA, Moscow).

A disadvantage of the known devices and methods of their installation - the impossibility of combining works of zero cycle works on construction elements of a building or structure above the zero mark.

3. The invention

3.1. The result of solving the technical problem

The technical result is an increase in accuracy for the vertical installation of the supporting Foundation and structural design of a building or structure elements and the construction of buildings, structures simultaneously up and down to below zero.

3.2. The invention

Reinforced concrete column, comprising seminolecounty concrete reinforcement cage and embedded parts consisting of the upper bearing and the lower base parts according to the invention is executed in a non-removable formwork with �p://img.russianpatents.com/chr/945.gif">=(2g+2+2),

where Dc- the diameter of the borehole, in which the column;

gthe eccentricity of the projection geometric axis relative to the projection axis of the center of mass of the column in the plane of its top;

- the deviation of the axis of the borehole from the vertical;

- the deviation of the axis of the borehole in the plan;

and fixtures placed in the upper bearing part of the column in the levels of markers of a base plate and marks slabs and made in the form of closed loops with ribs, the lower part of the column equipped with a bottom-hole camera and retainers.

In reinforced concrete column reinforcement cage is made of steel, and non-removable formwork made of tubes of round or square section.

Permanent formwork placed in the upper bearing part of the column, part of the reinforcing cage, placed in the lower Foundation part of the column, are connected by the imposition of "overlap" with the part of the reinforcing cage, placed in the upper bearing part with the incorporation of the elements of the reinforcement cage. This is equivalent to the outer diameter permanent formwork equivalent to the inner diameter part of the reinforcing cage, placed in the lower Foundation part of the column, equal to or greater than the outer diameter permanent casing.

In the method of construction of the drilling concrete columns, comprising the operations of manufacturing the reinforcement cage of the column with concrete inserts concrete placement, permanent formwork in a project position in the borehole with monolithic, according to the invention the column is carried out from the upper bearing part and the lower base part, and well Buryats diameter

DwithDto+2g+2+2,

where Dto- maximum equivalent diameter of the column reinforcing cage,

gthe eccentricity of the projection geometric axis relative to the projection axis of the center of mass of the column in the plane of the top of the column,

- the deviation of the axis of the borehole from the vertical,

- the deviation of the axis of the borehole in the plan,

immerse the armature frame columns vertically in the hole with a gap from the bottom of the wells on the value of P0,1 Dc, ve the slight pressure from the beginning down to the base of the well with fixing the lower part of the clamps, zamonolichivajut concrete from the bottom up the lower Foundation part of the column and the inner part of the permanent formwork upper bearing part of the column.

After seminolecounty exercise broadening and cementation of the soil Foundation through technological pipeline, placed inside of the reinforcement cage, the space between the permanent casing and the borehole wall of the upper support part of the granular fill material.

3.3. List of figures

In Fig.1 presents an example of the construction of the drilling concrete columns with the placement of non-removable casing in the upper bearing part of the column, Fig.2 - section "1-1" in Fig.1 at the level of marks embedded parts with radial ribs, Fig.3 is a view along arrow "A" in Fig.1, in Fig.4 - section "2-2" of Fig.3, in Fig.5 - process the sequence of construction of the drill, where 1 is the upper bearing part of the column, 2 - non-removable formwork, 3 - lower Foundation part of the column, 4 - bottom Luggage, 5 - sealing, 6 - clamps, 7 - reinforcing cage (top), 8 - reinforcement cage (bottom), 9 - embedded plate with radial ribs 10 - drilling, 11 - dive and centering reinforcing cage, 12 - monolithic columns, 13 - technetium way.

Reinforced concrete column (Fig.1) made with the possibility of installing it in the borehole contains seminolecounty concrete reinforcement cage (7, 8) and embedded parts (9) of the column having a closed contour with the ribs. The column is divided into an upper part (1) (reference under part overlap) and lower part (3) (base support) with an equivalent diameter Dc, reinforcement cage is placed in a non-removable formwork (2), and in the particular case of permanent formwork is placed only in the upper bearing part of the column. In this case, the upper and lower parts of the reinforcing frame connecting the "overlap" with seal (5) to provide a rigid connection and unity of the skeleton of the upper and lower parts. The lower part of the base is made with bottom-hole chamber (4) to ensure the bearing capacity of the column base with clamps (6) for fixing the bottom of the tower from the horizontal offsets.

The column is run with a maximum external diameter of the column Dto<Dthe value of=(2g+2+2) to compensate for the eccentricity of the column and compensation of defects drilling at its vasaturo frame columns (7) going out of business longitudinal and distribution ring or spiral rods and practically no different from the reinforcing cage conventional bored piles.

To provide connection to the drill with the floor slab of the underground floors and base plate in the reinforcement cage of the upper part (7) is installed embedded parts (9) in the form of pipes of smaller diameter with radial welded ribs. The diameter of the inserted pipe is less than the diameter of the nonremovable tube casing (2) to double the width of the supporting ring mortise console, allowing the support of floors and base plate drill column on the principle of "concrete on concrete" without regard to the operation of the pipe-casing (2) that provides for underground structures fire resistance of load-bearing structures. The length of the embedded parts (9) equals not less than the sum of the thickness of adjacent nodes in communication with the drill string overlap (base plate) and three times the size of the mounting tolerances on the height of the column (h mm).

Radially welded to the mortgage tube ribs compensate for the weakening of the bearing capacity of the column during cutting of the concrete when performing reference mortise consoles communication with the floors and the base plate. The ribs also serve to coaxially coupling the longitudinal operating rod of the upper part of the column reinforcing cage (7) between aeti of the column reinforcing cage (8) is rigidly fixed in the nonremovable tube-formwork (2) welding of internal stoparea ring.

The lower part of the column reinforcing cage (8) is collected from the business longitudinal and distribution ring or spiral rods and rigidly connects lap-welded connections with nonremovable tube-casing (2) in the area of the seal (5).

The lower part of the column reinforcing cage (8) is supplied with bottom-hole chamber (4) with clamps (6) to fasten the lower part of the column reinforcing cage (8) from the horizontal displacements as at the final stage of the installation of one-piece reinforcing cage in a borehole, and in the process of seminolecounty columns.

The bottom-hole chamber (4) eliminates the mixing of the concrete mix during seminolecounty column method of vertically moving within the reinforcement cage (7, 8) pipe with settled to the bottom of the borehole drill cuttings, and enables you to perform the broadening and cementation to ensure high load bearing capacity of the column on gruntovaya base. The bottom-hole chamber (4) is calculated on the total column density of the concrete mix, the weight of one-piece reinforcing cage (7, 8) and the weight of the backfill granular material (gravel or crushed stone) gap between the borehole wall and the pipe-casing (2).

Inside the upper and lower parts (7, 8) Ashe heads erected columns, and the bottom - in bottom-hole chamber (4). The technological pipeline (13) is used to check the inclinometer vertical position of one-piece reinforcing cage on the installation, subsequent to the monolithic columns of individual qualifying exploration, flush bottom-hole chamber (4) from cuttings, as well as education widened soles and cementation of the soil Foundation.

Individual lookup exploration, produced through the process pipe (13) at the base of the drill allows you to estimate the actual geological structure and bearing capacity of soils directly at its base, if necessary, to take measures to increase the bearing capacity, to eliminate the risk of using drill strings during the construction of buildings at the same time up and down below zero.

The method of construction drill string

The method of construction drill combines the operations of manufacturing and installation of columns in the design position, allows centering its reinforcing cage to compensate for the eccentricity of the projection of the geometric axis and the projection axis of the center of mass.

The method involves the drilling of a well (10) of diameter Dc>Dkin the f">) taking into account possible deviations of the axis of the bore in the plan and from the vertical, as a rule, under the protection of the mud.

The design of the communication nodes drill string from the ceiling of the underground floors and the base plate defines a tolerance altitudinal position of the head of the column after the erection of ±100 mm, the tolerance is presented and the depth of the borehole. As mentioned tolerance in drilling hard to ensure that the method of construction involves the execution of a leveling bed of granular material (crushed stone or gravel fractions of 40-70 mm) on the bottom in case of exceeding the design depth is more than 100 mm and after cleaning the bottom of a borehole drilled from the settled soil or rock. When used in drilling mud after drilling, you will replace the spent mud on freshly prepared.

The amount required for the bedding of granular material is determined by calculation after measuring the depth of the drilled hole. Compaction of granular bedding material is manufactured using a standard mounted drilling equipment. Then re-measured depth squalling reinforcing cage (2, 7, 8) in the well is carried out by road crane of required characteristics.

Shipped reinforcing cage (2, 7, 8) through the bottom hole of the camera (4) rests on the bottom of the drill hole and covered trambovaniem granular material, and clamps (6) runs into him. Then head over to the upper part of the reinforcing cage (2, 7) column is set inventory centering jig equipped with a system of horizontal and vertical hydraulic jacks. Support frame centering of the conductor temporarily rigidly fixed to forsake.

The centering (11) one-piece reinforcing cage (2, 7, 8) precedes the rise of the vertical frame hydraulic jacks conductor to a P-value0,lDc towards the top of the leveling bed at the bottom of the hole. The bottom-hole chamber (4) with the distance from the borehole bottom by the same amount and the frame hangs freely in the hole, occupying a vertical position under the action of its own gravity (status "plumb"). Compensation of eccentricity of the projection of the geometric axis and the projection axis of the center of mass is achieved by the design of the reinforcement cage (7, 8).

Centering (11) of the reinforcement cage in terms of running the system is STI one-piece reinforcing cage (2, 1, 8) by means of the inclinometer installed in the process line (13).

Then calibrated in terms of occupying the position of "plumb" frame columns by vertical hydraulic jacks conductor synchronously sinks to the bottom of the well. The latches (6) bottom-hole chamber (4) when this hit the granular backfill material at the bottom of the hole, thereby fixing the lower part of the reinforcing cage (8) from offset during seminolecounty.

The monolithic (12) columns is carried out continuously by the method of vertically moving inside one-piece reinforcing cage (7, 8) bitonality pipe with parallel bridging (filling) granular material (crushed stone or gravel fractions of 40-70 mm) gap between the nonremovable tube-casing (2) and the borehole wall. Backfill begins after seminolecounty the lower part of the reinforcing cage (8) and parallel to the monolithic upper part of the reinforcing cage (7). Pre rigidly fixed on forsake the upper part of the reinforcing cage (2, 7) and removed the inventory centering jig.

After the construction of the drill through the process piping, the ends of which at the time seminolecounty columns muted on the Sabbath.

This additional exploration in addition to the stated technical result allows to eliminate the risk of invalid precipitation of the column due to the mismatch between the actual geological conditions adopted in the project, and to make the right decision in construction conditions as needed and the magnitude of the broadening and cementation of the soil base of the column to ensure the bearing capacity of the construction of buildings and structures simultaneously up and down to below zero.

The technological pipeline (13) placed below the bottom of the camera (4), allows the flushing of solids settled at the bottom of the well and remaining in the chamber after seminolecounty columns, and perform, at least, cementing the moulding of the base, unless you want to run broadening or larger cementing operations.

The method of construction ensures the accuracy of the drilling concrete columns with a deviation of its axis from the vertical of not more than 1:500 and ±5 mm for the plan.

4. The possibility of carrying out the invention

The combination in a single structure functions of the base member and vertical support member of a building or structure and method of erecting the pillars improve the accuracy of the redecoration of the second sequence) to perform work above and below ground zero mark.

During the construction of a multifunctional complex "king's garden", as well as five-level underground Parking MFGC Arbat Center", Moscow, carried out the construction of drilling reinforced concrete columns by the proposed method.

The implementation of such large-scale project as the "king's garden", would be impossible without the use of new design and technology for the construction of drill strings, specially designed for this object. In order to emphasize the fundamental differences between solutions from drilling piles, introduced the term "drilling column. There are no restrictions on the progressive construction of the aerial parts of buildings above the underground implemented by the project are not included. Take into account that grow faster than above-ground floors, the more the weights of the pit and below the magnitude of the deformation of the surrounding soil mass and erected structures. 225 drill strings of length 26.5 m erected from the surface of the site with high precision as a permanent load-bearing structures, does not require any subsequent gain or improvement.

The accuracy of columns (vertical slope no greater than 1:500) was achieved through the use of its own gravity solid Armat the bornite ores solution. Based on the design of junctions drill strings with overlapping underground floors and base plate project was established tolerance for the deviation of the axis of the columns from the vertical of not more than 1:500, tolerance for altitude deviation of the heads of the columns of ±100 mm

The upper portion of each reinforcing cage was unrecoverable steel pipe casing with a diameter of 720 mm of the lower part was going from rebar-based steel rings with a diameter of 920 mm and was supplied to the bottom chamber.

After concrete drill strings necessary strength produced individual lookup exploration in their base. For this purpose, was used pipes, bred in the bottom chamber and pre-plugged with wooden plugs.

The construction of the first ten drill strings proved the correctness of a conceptual approach to ensuring their carrying capacity on the ground in difficult geological conditions. As shown by data for individual exploration, performed at the bases of the columns, the actual geological structure often differed significantly from these preliminary jaisinghani produced in enough detail. In places the roof is destroyed investergate clay and lime powder. He confirmed the assumption of a sufficiently large amount of solids deposited on the bottom of the wells and the complexity of its removal from this depth by conventional methods. According to the results of individual exploration, decisions were made on the execution depth broadening the soles of each column by erosion of soils and interblock interlayer jet of water under pressure and the subsequent jet grouting.

To pair drilling columns and floor slab of the underground floors developed a new, structurally uniform, simple and reliable at all stages of construction, fire-resistant in the operation of underground structures nodes.

New design and technology for the construction of drill strings were also a key element of the semi-closed method of construction of a five-level underground Parking MPGS "Arbat-Center and two-technology case and planned 13-story office building above it.

59 drill strings in diameter 720/120 cm and a length of 22.5 m installed on the surface of the site with high precision as a permanent load-bearing structures, does not require any subsequent gain or improvement. Because of the extreme tightness of temporary construction conditions the ext-align:center; margin-top:2mm;">Claims

1. Reinforced concrete column, comprising seminolecounty concrete reinforcement cage and embedded parts consisting of the upper bearing and the lower base parts, wherein the column is made in permanent formwork with equivalent maximum external diameter of the reinforcement cage dto< Dcthe value of

=(2g+2+2),

where Dc- the diameter of the borehole, in which the column;

gthe eccentricity of the projection geometric axis relative to the projection axis of the center of mass of the column in the plane of its top;

- the deviation of the axis of the borehole from the vertical;

- the deviation of the axis of the borehole in the plan,

and fixtures placed in the upper bearing part of the column in the levels of markers of a base plate and marks slabs and made in the form of closed loops with ribs, the lower part of the column equipped with a bottom-hole camera and retainers.

2. Reinforced concrete column under item 1, characterized in that the reinforcing carcasona column under item 1, wherein the non-removable formwork placed in the upper bearing part of the column, part of the reinforcing cage, placed in the lower Foundation part of the column, are connected by the imposition of "overlap" with the part of the reinforcing cage, placed in the upper bearing part with the incorporation of the elements of the reinforcement cage.

4. Reinforced concrete column under item 1, characterized in that the equivalent outer diameter part of the reinforcing cage, placed in the upper bearing part of the column, equal to or less than the internal diameter permanent casing, the equivalent inner diameter part of the reinforcing cage, placed in the lower Foundation part of the column, equal to or greater than the outer diameter permanent casing.

5. The method of construction of the drilling concrete columns, comprising the operations of manufacturing the reinforcement cage of the column with concrete inserts concrete placement, permanent formwork in a project position in the borehole with monolithic, characterized in that the column is carried out from the upper bearing part and the lower base part, and well Buryats diameter

DcDto+2g+2+2>/img>gthe eccentricity of the projection geometric axis relative to the projection axis of the center of mass of the column in the plane of the top of the column;

- the deviation of the axis of the borehole from the vertical;

- the deviation of the axis of the borehole in the plan,

immerse the armature frame columns vertically in the hole with a gap from the bottom of the well at a P value0,1 Dcvertically center to compensate for the eccentricity and fix the upper part of the horizontal displacement vertically lowered to the base of the well with fixing the lower part of the fixing devices zamonolichivajut concrete from the bottom up the lower Foundation part of the column and the inner part of the permanent formwork upper bearing part of the column.

6. The method according to p. 5, characterized in that after seminolecounty exercise broadening and cementation of the soil Foundation through technological pipeline, placed inside of the reinforcement cage, the space between the permanent casing and the borehole wall of the upper support part of the granular fill material.

 

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SUBSTANCE: method involves pressing pile in ground along with simultaneous driving thereof with the use of inner inventory key. Torque is initially applied to screw blade by inventory key and then as pile driving resistance increases pile shaft is also involved in torque transfer process, wherein exceeding of predetermined torque value to inventory key or pile shaft is not allowed. Screw pile comprises cylindrical tubular shaft with guiding cone, screw blade and seat formed in lower shaft part for inner inventory key installation. Shaft is formed of metal and has means for taking torque transferred from above key.

EFFECT: reduced material consumption due to providing two-stage torque transfer scheme, increased reliability of pile driving process and pile as a whole.

7 cl, 8 dwg

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