Method for bored and cast-in-place pile forming along with ground compaction at hole bottom

FIELD: building, particularly pile foundation erection.

SUBSTANCE: method involves drilling hole; installing injection pipe in the hole bottom center; installing reinforcement case; injecting cement-and-sand grout through the injection pipe below lower pile end for ground compaction and widened part arrangement; concreting the pile. To create widened part of the pile and to compact ground after concrete hardening cement-and-sand grout is fed under pressure into sealed bag formed of elastic water impermeable material and connected to lower end of ejection pipe so that cement-and-sand grout expands the bag up to reaching necessary bag volume.

EFFECT: increased economy of pile forming, increased ability of clay ground compaction at pile base.

4 dwg, 1 ex

 

The invention relates to the construction, namely, Foundation, and can be used in the installation of pile foundations of bored piles.

Known so-called dry method of manufacturing bored piles (Emily and other Pile foundations and buried structures in the reconstruction of existing enterprises. Leningrad, stroiizdat, 1989. - p.44-45). According to this method, in the ground rotational auger drilling is arranged well. Then in the finished well is installed reinforcing cage, and concreting the piles. This method is quite simple and has been widely used during the installation of bored piles in sustainable clayey soils.

However, bored piles, made this way, compared with other types of piles, have low specific load-carrying capacity. This is due primarily to the fact that this technology does not provide a seal (hardening) of the soil under the fifth piles, and Vice versa in the process of drilling wells inevitably loosening and softening of the soil in her face.

Closest to the proposed method is a method of manufacturing bored piles-injectors (Iahunece. The device of artificial bases and foundations. Moscow, Stroyizdat, 1981. - S. 130-200). According to this method, the soil being drilled well. Center th is new wells score injector pipe, so that its lower end was below the sole of the wells at 0.5 m Pipe can be made with embossing tip or with a perforated end. Then in the lower end of the pile arrange waterproof tube and through injecting pipe in ground pump fixing solution. After fixing the ground start concreting the piles.

Bearing capacity on the ground bored piles-injector in the consolidation of the soil at the base is significantly higher than conventional bored piles.

Fairly well fixed by the method of cementation gravelistoe and sandy soils. When fixing the silt and clay soils technological process much more complicated. May cause breaks in the soil and, consequently, increasing the flow rate of the injected solution and the low quality of fixing soil.

The objective of the invention is to provide a possibility of making a bored pile with sealing clay soil at its base and is more cost effective flow rate of the injected cement-sand mortar.

To obtain a technical result in the proposed method of manufacture of bored piles with soil compaction in the bottom of a well, including drilling, installation of pipe-injector, the reinforcement cage, the concreting of the pile and the injection of a cement-sandy solution through the pipe-Inya the torus under the lower end of the pile to soil compaction and device ening, pipe-injector additionally provide hermetically secured at its lower end a bag of waterproof elastic material, placed the pipe-injector in the center of the face of the finished hole, and pumped after hardening of the concrete through a pipe-injector under pressure cement-sand mortar open the bag up to a specified amount, which forms the broadening of the piles and compacts the soil at the base of the piles. The claimed method differs from the prototype in that the pipe-injector with sealed at its lower end a bag of waterproof elastic material is placed in the center of the face of the finished hole, and pumped after hardening of the concrete through a pipe-injector under pressure cement-sand mortar open the bag up to a specified amount, which forms the broadening of the piles and compacts the soil at the base of the piles.

The method is illustrated by the circuit devices bored piles with soil compaction in the bottom of a well:

Figure 1 is a device well rotationally auger drilling.

Figure 2 - installation of pipe-injector and a bag of flexible waterproof material in the bottom of a well.

Figure 3 - installation of the reinforcing cage, and concreting the piles.

Figure 4 - formation of broadening and compression of the soil at the base of bored piles by forcing into the elastic waterproof bag tsementnopeschany solution.

A method of manufacturing bored piles with soil compaction in the bottom hole is implemented as follows.

Rotary auger drilling arrange the borehole (figure 1). In the bottom hole drilled in the center of the bottom hole installing the pipe-injector 1 with a bag of flexible waterproof material 2 in the assembled position (figure 2). Set in the hole of the reinforcing frame 3 and fill it with concrete 4 (figure 3). After concrete setting 4 in the bag 2 through the pipe-injector 1 pressure drop of cement-sand mortar (figure 4).

Example

Rotary auger drilling arrange the borehole (figure 1). In the bottom hole drilled in the center of the bottom hole installing the pipe-injector 1 with a bag of flexible waterproof material (e.g. plastic bag) 2 in the assembled position (figure 2). Set in the hole of the reinforcing frame 3 and fill it with concrete 4 (figure 3). After concrete setting 4 in the bag 2 through the pipe-injector 1 pressure drop of cement-sand mortar (figure 4), which opens the bag up to a specified amount, generates a broadening of the piles and compacts the soil at the base of the piles.

A method of manufacturing bored piles, including the drilling of wells, installation of pipe-injector in the center of the face of the finished hole, the reinforcing frame, the injection of a cement-sandy solution through t the Ubu-injector under the lower end of the pile to soil compaction and device ening, concreting of the pile, wherein the first carry out concreting well, and after hardening of the concrete in a tightly secured on the lower end of the pipe-injector bag of flexible waterproof material is fed under pressure cement-sand mortar, which opens the bag up to a specified amount to ensure the broadening formation of piles and soil compaction at the base of the piles.



 

Same patents:

FIELD: building, particularly for pile erection in civil and industrial building.

SUBSTANCE: method involves drilling hole; installing injection pipe in the hole; reinforcing thereof with reinforcement frame; concreting pile body and injecting reinforcement grout through injection pipe. Hole reinforcing is carried out simultaneously with installation of reinforcement frame having injection pipe connected thereto. Grout pumping is carried out by supplying pulsing flow under lower pile end when pile body is not hardened.

EFFECT: reduced cost and labor inputs for injection pile erection.

1 dwg

Bearing pile // 2251609

FIELD: building, particularly for constructing foundations of various building structures.

SUBSTANCE: bearing pile comprises head, rod and tip fixed to embedded rod part by embedded member. The tip is formed of thermoplastic concrete and has electric heater located inside the tip. Electric heater heats the tip after driving thereof into ground as far as it will go to obtain softening temperature of 80-150°C. Then the pile is fully driven in ground. Electric heater wires are placed in tube in longitudinal rod direction and brought outside under pile head for connection thereof with electric power source.

EFFECT: increased load-bearing pile capacity due to provision of widened pile tip support area.

2 cl, 5 dwg

FIELD: building, particularly for erecting foundations for industrial and civil building, for constructing piles in seasonally freezing ground.

SUBSTANCE: pile comprises upper part made of reinforced concrete, lower part made of ground and reinforced with time-hardening mortar injected in it. Pile has at least one inner injection channel. Upper end of upper pile part comprises means, particularly reinforcement extensions, to connect thereof to structure supported by pile. Lower end of upper part rests upon lower pile part. Each injection channel extends along the full pile length. Upper pile part is made as truncated cone with greater base facing down. Cone has hu height, bo and bu widths of upper and lower bases correspondingly. bo and bu are selected from the following: bu ≤ bo + 2hu. Lower pile end is made as convex widening with minimal transversal direction of not less than bu. Height hl of lower pile part is determined from a given relation.

EFFECT: increased bearing capacity, provision of lower pile part strength alternating along pile height along with decreased labor inputs and production cost.

3 cl, 5 dwg

The invention relates to the construction, and in particular to methods of device cementogenesis piles in weak, structurally unstable soils

The invention relates to the field of construction, namely the construction of high-rise and other buildings constructed on weak and saturated grounds

The invention relates to a Foundation, in particular to the technology of the device of the piles

FIELD: building, particularly foundation building, namely for erecting pile foundations in seasonally freezing ground.

SUBSTANCE: method involves forming well extending for the full thickness of seasonally freezing ground layer, wherein well diameter increases pile diameter; installing heater in the well; transferring heat; driving casing pipe with detachable tip in ground through heater cavity; concreting well bore along with simultaneous lifting casing pipe and removing heater. Heat is supplied to concrete mixture within the limits of seasonally freezing ground after casing pipe removal. Inductor made as copper wire coil covered with heat-protective layer and located outside metal pipe is used as the heater. Heating is performed within 10-12 hours along with maintaining 75-80°C temperature of concrete mix by regulating inductor power up to obtaining concrete strength equal to 80% of design strength. After inductor removal from the well gap formed between well wall and pile body is filled with non-heaving ground.

EFFECT: reduced power inputs along with maintaining high productivity and increased load-bearing pile capacity.

2 cl, 3 dwg

FIELD: building, particularly for erecting support structures, namely pile foundations, injection anchors, walls in ground, cast-in-place reinforced earth constructions and other geotechnic structures used for new building erection or reconstruction of existent buildings.

SUBSTANCE: method involves forming well or trench section in ground; at least partly filling thereof with hardening material or drilling agent, for instance with cement-bentonite one; substituting thereof with hardening material; immersing reinforcing cage with outer flexible shell connected to at least part of cage length in well. The flexible shell is permeable for liquid fraction of the hardening material and provides waterproofing of the cage after setting of above material and hardening material located outside the shell. Shell parameters are determined from the given correlations.

EFFECT: increased load-bearing capacity, reliability and service life, extended field of application.

24 cl, 9 dwg

FIELD: building, particularly cast-in-place building units, namely support structures.

SUBSTANCE: reinforced concrete column is formed in retained formwork and consists of upper support part and lower foundation part. Column includes reinforcement frame grouted with concrete mix and embedded members arranged in upper column part. Upper part of frame is located in retained formwork. Embedded members are in level with foundation slab marks and with flooring panel marks. Embedded members are formed as closed contours with stiffening ribs. Column is built in single- or multi-slot hollow. Projection of geometric retained formwork cross-section center coincides with that of lower reinforcement frame part. Arms of lower reinforcement form part extending in Y-axis direction are sized in accordance with given mathematical relation. Method of column erection involves forming single- or multi-slot hollow; producing reinforcement form with embedded members; forming retained formwork; installing above components; vertically placing the reinforcement frame in hollow so that frame is spaced a distance from hollow bottom; vertically adjusting and fixing upper column part to prevent transversal displacement thereof; grouting lower column part in bottom-top direction; grouting inner retained formwork area of upper column part. Hollow has dimensions measured in Y-axis direction determined from given relation.

EFFECT: possibility of simultaneous building erection in upward and downward directions relative ground level.

7 cl, 13 dwg

FIELD: building and construction.

SUBSTANCE: method includes serial vibration immersion of inventory elements into soil, which are mated between each other, and their following vibration extraction with concurrent filling of hollow in soil with concrete mixture. Inventory elements are used, which are made in form of profiled posts, having gates in lower portion, closed during immersion in soil and opened by flexible links during extraction of elements from soil and feeding of concrete mixture. At the same time profiled elements of longitudinal walling have lesser length, than length of profiled elements of vertical posts, which during immersion are pressed in for greater depth than profiled elements of longitudinal walling. First, profiled element of longitudinal walling is immersed, and then via guiding conductor profiled element of vertical post is densely mated to it and is than immersed. Concrete mixture is loaded in profiled element of longitudinal walling with its extraction with open gates and extracted element is immersed in next position adjacently to previous profiled element of vertical post being in soil. Concrete mixture is loaded into profiled element of vertical post during its extraction with open gates and extracted element if immersed into following position with concurrent mating to previous profiled element of longitudinal walling with use of guiding conductor. Then inventory elements are immersed again. Device for construction of bearing-limiting structures in soil includes crane or pile driver with vertical guide, vibration immersion driver and at least two inventory hollow elements. Inventory elements are made in form of profiled elements of longitudinal walling and profiled elements of vertical posts. Profiled elements of longitudinal walling have length less than length of profiled elements of vertical posts, which are made of hollow rectangular profiles, rigidly interconnected by solid rib along transverse axis along whole height of element, while vertical guide in lower portion is provided with guiding conductor.

EFFECT: higher efficiency, broader functional capabilities.

2 cl, 13 dwg

FIELD: building structures, particularly shallow foundations.

SUBSTANCE: method involves creating well by ground excavation, introducing preparatory portion of hardening material in well hollow including calculated part of hardening material; arranging explosive charge in lower well part; securing explosive charge; blowing explosive charge up to create cavity for widened foundation post part; crushing and widening above calculated part after explosion; introducing additional portion of hardening concrete in well up to 4/5 of well height; filling it with calculated part of above material portion. Concrete for casting is used as preparatory hardening material.

EFFECT: reduced time, increased simplicity of foundation building and reliability.

2 cl, 5 dwg

The invention relates to the construction, namely, Foundation, and can be used during the construction of piled foundations in weak water-saturated clay soils in conditions of unfettered urban development

The invention relates to the field of construction in cramped conditions

The invention relates to the construction and installation of pile foundations mainly in ground subsidence of the second type, swelling and bulk soils

Pile // 2186905
The invention relates to the construction and can be used during the execution of pile foundations of buildings and structures

FIELD: building structures, particularly shallow foundations.

SUBSTANCE: method involves creating well by ground excavation, introducing preparatory portion of hardening material in well hollow including calculated part of hardening material; arranging explosive charge in lower well part; securing explosive charge; blowing explosive charge up to create cavity for widened foundation post part; crushing and widening above calculated part after explosion; introducing additional portion of hardening concrete in well up to 4/5 of well height; filling it with calculated part of above material portion. Concrete for casting is used as preparatory hardening material.

EFFECT: reduced time, increased simplicity of foundation building and reliability.

2 cl, 5 dwg

FIELD: building and construction.

SUBSTANCE: method includes serial vibration immersion of inventory elements into soil, which are mated between each other, and their following vibration extraction with concurrent filling of hollow in soil with concrete mixture. Inventory elements are used, which are made in form of profiled posts, having gates in lower portion, closed during immersion in soil and opened by flexible links during extraction of elements from soil and feeding of concrete mixture. At the same time profiled elements of longitudinal walling have lesser length, than length of profiled elements of vertical posts, which during immersion are pressed in for greater depth than profiled elements of longitudinal walling. First, profiled element of longitudinal walling is immersed, and then via guiding conductor profiled element of vertical post is densely mated to it and is than immersed. Concrete mixture is loaded in profiled element of longitudinal walling with its extraction with open gates and extracted element is immersed in next position adjacently to previous profiled element of vertical post being in soil. Concrete mixture is loaded into profiled element of vertical post during its extraction with open gates and extracted element if immersed into following position with concurrent mating to previous profiled element of longitudinal walling with use of guiding conductor. Then inventory elements are immersed again. Device for construction of bearing-limiting structures in soil includes crane or pile driver with vertical guide, vibration immersion driver and at least two inventory hollow elements. Inventory elements are made in form of profiled elements of longitudinal walling and profiled elements of vertical posts. Profiled elements of longitudinal walling have length less than length of profiled elements of vertical posts, which are made of hollow rectangular profiles, rigidly interconnected by solid rib along transverse axis along whole height of element, while vertical guide in lower portion is provided with guiding conductor.

EFFECT: higher efficiency, broader functional capabilities.

2 cl, 13 dwg

FIELD: building, particularly cast-in-place building units, namely support structures.

SUBSTANCE: reinforced concrete column is formed in retained formwork and consists of upper support part and lower foundation part. Column includes reinforcement frame grouted with concrete mix and embedded members arranged in upper column part. Upper part of frame is located in retained formwork. Embedded members are in level with foundation slab marks and with flooring panel marks. Embedded members are formed as closed contours with stiffening ribs. Column is built in single- or multi-slot hollow. Projection of geometric retained formwork cross-section center coincides with that of lower reinforcement frame part. Arms of lower reinforcement form part extending in Y-axis direction are sized in accordance with given mathematical relation. Method of column erection involves forming single- or multi-slot hollow; producing reinforcement form with embedded members; forming retained formwork; installing above components; vertically placing the reinforcement frame in hollow so that frame is spaced a distance from hollow bottom; vertically adjusting and fixing upper column part to prevent transversal displacement thereof; grouting lower column part in bottom-top direction; grouting inner retained formwork area of upper column part. Hollow has dimensions measured in Y-axis direction determined from given relation.

EFFECT: possibility of simultaneous building erection in upward and downward directions relative ground level.

7 cl, 13 dwg

FIELD: building, particularly for erecting support structures, namely pile foundations, injection anchors, walls in ground, cast-in-place reinforced earth constructions and other geotechnic structures used for new building erection or reconstruction of existent buildings.

SUBSTANCE: method involves forming well or trench section in ground; at least partly filling thereof with hardening material or drilling agent, for instance with cement-bentonite one; substituting thereof with hardening material; immersing reinforcing cage with outer flexible shell connected to at least part of cage length in well. The flexible shell is permeable for liquid fraction of the hardening material and provides waterproofing of the cage after setting of above material and hardening material located outside the shell. Shell parameters are determined from the given correlations.

EFFECT: increased load-bearing capacity, reliability and service life, extended field of application.

24 cl, 9 dwg

FIELD: building, particularly foundation building, namely for erecting pile foundations in seasonally freezing ground.

SUBSTANCE: method involves forming well extending for the full thickness of seasonally freezing ground layer, wherein well diameter increases pile diameter; installing heater in the well; transferring heat; driving casing pipe with detachable tip in ground through heater cavity; concreting well bore along with simultaneous lifting casing pipe and removing heater. Heat is supplied to concrete mixture within the limits of seasonally freezing ground after casing pipe removal. Inductor made as copper wire coil covered with heat-protective layer and located outside metal pipe is used as the heater. Heating is performed within 10-12 hours along with maintaining 75-80°C temperature of concrete mix by regulating inductor power up to obtaining concrete strength equal to 80% of design strength. After inductor removal from the well gap formed between well wall and pile body is filled with non-heaving ground.

EFFECT: reduced power inputs along with maintaining high productivity and increased load-bearing pile capacity.

2 cl, 3 dwg

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