CN108425375B

CN108425375B - A prefabricated foundation column and its connection structure and construction method

Info

Publication number: CN108425375B
Application number: CN201810381333.1A
Authority: CN
Inventors: 李藏柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-04-25
Filing date: 2018-04-25
Publication date: 2025-03-25
Anticipated expiration: 2038-04-25
Also published as: CN108425375A

Abstract

The present invention discloses a prefabricated foundation column, the technical scheme of which includes a column body and an anchor bolt, wherein the anchor bolt is vertically cast in the column body, the anchor bolt includes a rod portion and a support leg which is perpendicular to the rod portion and is integrally formed with the rod portion, and the upper portion of the rod portion extends out of the column body and is placed above the column body; the present invention also discloses a method for installing a prefabricated foundation column, the technical scheme of which includes the following installation steps: step a, digging a foundation pit, casting a concrete cushion layer at the bottom of the foundation pit and arranging a steel mesh on the cushion layer; step b, vertically placing the prefabricated foundation column in the foundation pit; step c, adjusting the position of the prefabricated foundation column to keep the rod portion of the anchor bolt vertical; step d, casting concrete at the bottom of the foundation pit to cover the lower portion of the main body with concrete; step e, backfilling the foundation pit after the concrete at the bottom of the foundation pit solidifies; the purpose of avoiding deviation of the position of the anchor bolt during the foundation casting process is achieved.

Description

Foundation prefabricated column, connection structure thereof and construction method thereof

Technical Field

The invention relates to a building foundation, in particular to a foundation prefabricated column, a connecting structure thereof and a construction method thereof.

Background

The foundation is the structural component that transfers the various actions to which the structure is subjected to the foundation. When the top of the foundation is connected with the steel structural column, foundation bolts need to be pre-buried in the foundation. In the common foundation construction process, foundation bolts are required to be vertically fixed in a foundation pit, foundation steel bars are bound, templates are installed, and finally concrete pouring is carried out. Because during concrete placement, rag bolt very easily takes place skew and slope under receiving external force interference to lead to the position deviation of the exposed screw rod in top to surpass the standard requirement, cause steel construction post installation difficulty, and seriously influence the quality of being connected with steel construction post. Even if the adjustment is carried out in the later stage, the bearing capacity requirement of the original design cannot be met, the adjustment is labor-consuming, and the construction period is influenced.

Disclosure of Invention

The invention aims to provide a foundation precast column which can reduce deviation of the position of an anchor bolt in the foundation pouring process.

The foundation prefabricated column comprises a column body and foundation bolts, wherein the foundation bolts are vertically poured into the column body, the foundation bolts comprise rod parts and supporting legs perpendicular to the rod parts, and the upper parts of the rod parts extend out of the column body and are arranged above the column body.

A second object of the present invention is to provide a connection structure of a foundation pre-fabricated post, which has more accurate anchor bolt positions and high installation quality.

The foundation prefabricated column comprises a column body and foundation bolts, wherein the foundation bolts are vertically poured into the column body, each foundation bolt comprises a rod portion and supporting legs perpendicular to the rod portion, the upper portion of the rod portion extends out of the column body and is arranged above the column body, and the bottom of the column body is buried in cast-in-situ foundation concrete.

Through adopting above-mentioned technical scheme, make rag bolt can not take place skew and slope in concrete placement process, avoid causing and produce the deviation.

The third object of the invention is to provide a construction method of the foundation structure, which has simple installation steps and high construction efficiency.

The technical aim of the invention is realized by the following technical scheme:

The installation method of the foundation prefabricated column comprises the following installation steps:

step a, digging a foundation pit, and pouring a concrete cushion layer at the bottom of the foundation pit;

step b, vertically placing the foundation prefabricated column in the foundation pit;

C, adjusting the position of a foundation precast column to enable the rod part of the foundation bolt to be kept vertical;

step d, pouring concrete at the bottom of the foundation pit, so that the concrete covers the lower part of the main body;

And e, after the concrete at the bottom of the foundation pit is solidified, backfilling the foundation pit.

Through adopting above-mentioned technical scheme, make rag bolt can not take place skew and slope in concrete placement process, avoid causing the deviation, need not install the side form moreover, construction is quick high-efficient.

In summary, the invention has the following technical effects:

1. The foundation bolts are pre-poured into the foundation prefabricated columns, when the foundation construction is carried out, the foundation prefabricated columns are vertically placed in the foundation pit, concrete is poured at the bottom of the foundation pit, and as the foundation bolts are fixed in the columns, the foundation bolts can be prevented from being deviated and inclined when the concrete pouring is carried out below, meanwhile, the foundation construction is carried out through the foundation prefabricated columns, the construction is easy, and the construction period can be saved;

2. The lower part of the foundation bolt is poured into the column body, so that the stress requirement of the foundation bolt can be met, the consumption of the foundation bolt can be reduced, and the cost is saved;

3. The foundation structure is connected with the prefabricated ground beam/the prefabricated concrete column into a whole, so that the foundation structure has better stress and earthquake resistance;

4. by using the method, the template is not required to be installed, the construction is quick and efficient, and the construction period is saved.

Drawings

FIG. 1 is a schematic diagram of a basic prefabricated column structure;

FIG. 2 is a schematic diagram of a foundation pre-column installation;

FIG. 3 is a schematic cross-sectional view of a base pre-fabricated column;

FIG. 4 is a schematic view of the foundation bolt legs of the foundation precast column in the column;

Fig. 5 is a schematic view of a foundation precast column provided with internal reinforcing steel bars;

FIG. 6 is a schematic view of a base pre-fabricated column with legs located outside the column;

FIG. 7 is a schematic view of a base pre-fabricated column installation provided with locating holes;

FIG. 8 is a schematic view of a basic pre-fabricated column structure provided with locating holes;

FIG. 9 is a schematic view of a basic prefabricated column structure with a positioning hole as a through hole;

FIG. 10 is a schematic view of the construction of a first poured concrete in a through hole;

FIG. 11 is a schematic view of a construction in which concrete is poured into the through-holes for the second time and the bolts are wrapped;

FIG. 12 is a schematic view of a basic prefabricated column structure with column connecting ribs arranged on the side surface;

FIG. 13 is a schematic view of the connection of a foundation precast column with a precast floor beam with column connecting ribs on the side;

FIG. 14 is a schematic view of a prefabricated column structure with enlarged ends of column connecting ribs;

FIG. 15 is a schematic view of a column connecting rib with an enlarged head connected to a precast floor beam sleeve;

FIG. 16 is a schematic view of a prefabricated foundation column with laterally disposed access holes;

FIG. 17 is a schematic view of the structure of a perforated rib connecting two side ground beams after passing through a through hole;

FIG. 18 is a schematic view of a structure in which the perforated ribs are connected by sleeves after the enlarged head is provided;

FIG. 19 is a schematic view of a structure in which the ground beam connecting ribs provided with enlarged heads are directly connected by sleeves;

FIG. 20 is a schematic view of a two-sided high precast ground beam interconnect structure;

FIG. 21 is a side elevation precast ground beam interconnection construction step one;

FIG. 22 is a two-sided high precast ground beam interconnection construction step two;

FIG. 23 is a side elevation precast ground beam interconnection construction step three;

FIG. 24 is a side elevation precast ground beam interconnection construction step four;

FIG. 25 is a schematic view of a preformed foundation column structure with the stem threaded into a nut and then turned into an enlarged head;

FIG. 26 is a schematic view of the connection structure of the nut expansion head and the reinforcement sleeve at the bottom of the precast concrete column;

FIG. 27 is a schematic view of a preformed foundation column with an enlarged head at the end of the shank;

FIG. 28 is a schematic view of the connection structure of the enlarged footing and the reinforcement sleeve at the bottom of the precast concrete column;

FIG. 29 is a schematic view of a prefabricated foundation column structure disposed adjacent to a foundation base;

FIG. 30 is a schematic view of a sleeve connection structure of a precast foundation column and a precast concrete column;

FIG. 31 is a schematic view of the structure of a prefabricated foundation column with vertical rebar installed in the through holes;

FIG. 32 is a schematic view of the connection structure of a precast foundation column and a hollow precast concrete column;

FIG. 33 is a schematic view of the connection structure of a prefabricated foundation column and a hollow prefabricated concrete column and a prefabricated ground beam;

fig. 34 is a schematic structural view of a cylinder in a necked-down reinforcing bar coupling sleeve;

FIG. 35 is an end view schematic of a constriction;

Fig. 36 is a schematic view of the fit of the sleeve and the connecting rebar;

fig. 37 is a schematic view of the connection of the necked-in rebar junction sleeve to the prefabricated column;

FIG. 38 is a schematic structural view of a split cartridge;

FIG. 39 is a schematic diagram of the connection of the split cylinder and the pre-fabricated column;

fig. 40 is a schematic structural view of a sleeve connected to two reinforcing bars in a vertical state;

FIG. 41 is a schematic view of an outward extending snap-in sleeve;

fig. 42 is a schematic view of the assembly of the male snap sleeve with the connecting rebar.

The steel plate type post-cast steel plate type concrete pile comprises the following components of 1, a column, 11, column connecting ribs, 12, a through hole, 13, a perforated rib, 14, a post-cast filling belt, 2, an anchor bolt, 21, a rod part, 22, a support leg, 3, a supporting rib, 4, a positioning hole, 41, a reinforcing rib, 42, a through hole, 5, a foundation pit, 51, a concrete cushion layer, 52, a first casting area, 53, a second casting area, 6, a cylinder, 61, a shrinkage cavity, 611, a transitional conical surface, 62, a grouting hole, 63, a connecting plate, 631, a connecting hole, 64, a blocking element, 65, a clamping block, 651, a clamping hole, 66, a shrapnel, 7, H-shaped steel, 71, a steel plate, 72, a shear pile, 8, a prefabricated ground beam, 81, a ground beam connecting rib, 9, a precast concrete column, 91, a bottom connecting rib, 92, a hollow, 101, a sleeve, 102, a connecting rib, 103 and an enlarged head.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper", "lower", "bottom" and "top" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

When building the building foundation, at first need at foundation ditch 5 in vertical fixed rag bolt 2, then carry out the formwork and fill concrete and form the basis, rag bolt 2 easily takes place the skew with the slope leads to rag bolt 2's position to take place when filling concrete, can't satisfy the building requirement, later stage adjustment waste time and energy and easily cause rag bolt 2 to fix unstable condition, for solving the above-mentioned problem design one kind can avoid rag bolt 2 to take place the foundation precast column of slope and skew, its specific structure is as follows:

embodiment one:

The utility model provides a prefabricated post of basis, as shown in fig. 1, including cylinder 1 and rag bolt 2, rag bolt 2 pours inside cylinder 1, including vertical setting's pole portion 21 and perpendicular to pole portion 21's stabilizer blade 22, pole portion 21 and stabilizer blade 22 are integrated into one piece structure, and pole portion 21 upper end stretches out cylinder 1 and places in cylinder 1 top, and the top part of pole portion 21 can be the bolt head. The shank 21 of the anchor bolt 2 extends downwardly beyond the bottom surface of the column 1 and the leg 22 is located outside the column 1.

As shown in fig. 2, during installation, a cushion layer is poured at the bottom of the foundation pit 5, a reinforcing mesh is arranged, then a foundation precast column is hoisted into the foundation pit 5, after the position and the height are adjusted, the support legs 22 are fixedly connected with the reinforcing mesh, finally, the bottom of the foundation pit 5 is poured with concrete, the poured concrete coats the bottom of the column body 1, and after the concrete is solidified, the foundation pit 5 is backfilled, so that the foundation construction can be completed.

Because the rag bolt 2 is pre-buried in advance inside the cylinder 1, the relative position of pole portion 21 and bolt head is fixed when prefabricating, compares on-the-spot with rag bolt 2 single carry out the ligature, and the positional accuracy is higher. And after the foundation precast column is installed and fixed, the structure is stable, and the external force in the pouring process hardly affects the position of the foundation precast column, so that the position deviation of the foundation bolts 2 is well controlled after the whole foundation construction is completed, the precision is high, and the construction quality of the foundation is improved.

In addition, in the original foundation construction process, the formwork is required to be installed to pour concrete, and because the appearance structure of the foundation is large in lower part and small in upper part, the formwork is complex to install and time-consuming. With this method, the bottom of the foundation pit 5 is poured with concrete, so that the concrete wraps the bottom of the column 1, without installing a formwork. Therefore, the method has the advantages of quick and efficient construction and construction period saving.

As shown in fig. 3, the column 1 may take the form of a prism or a cylinder, etc., and the anchor bolts 2 are circumferentially arrayed in a plurality with the axis of the column 1 as the center.

When the designed foundation height is large, the height of the column 1 is required to be increased correspondingly, but the arrangement of the support legs 22 outside the column 1 causes waste of materials due to the high price of the foundation bolt 2 material compared with the ordinary steel bars. Therefore, as shown in fig. 4, the lower portion of the lever portion 21 and the leg 22 are both disposed inside the column 1. Preferably, the legs 22 are in an inverted configuration. The lower extreme of cylinder 1 is fixed to be provided with a plurality of supporting steel bars 3, and supporting steel bar 3 vertical setting, its upper end pour in cylinder 1, and each supporting steel bar 3 lower extreme keeps flushing. The supporting steel bar 3 can be a straight bar, and also can be turned outwards or inwards at the bottom of the supporting steel bar 3 as shown in fig. 4, so that the supporting and fixing are convenient.

The supporting reinforcement 3 can also be regarded as an internal vertical stress reinforcement of the column 1. As shown in fig. 5, the column 1 is a reinforced concrete structure, and is internally provided with vertical stress steel bars and stirrups, and the stirrups can be said to be two, namely, one is used for surrounding the vertical stress steel bars (which can be the supporting steel bars 3), and the other is used for surrounding the foundation bolts 2.

As shown in fig. 6, when the legs 22 of the anchor bolt 2 are located outside the column 1, the anchor bolt 2 may be used as a vertical stress reinforcement of the column 1, and stirrups may be arranged around the anchor bolt 2.

The legs 22 of the anchor bolt 2 may be in an everted or inverted configuration when positioned outside the column 1. When the device is turned outwards, the stress structure is better, and the device is turned inwards to facilitate processing and transportation of the foundation prefabricated column.

Embodiment two:

Referring back to fig. 2, the upper part of the foundation is in threaded connection with a steel plate 71 fixed at the bottom of the H-section steel 7 through anchor bolts 2 so as to achieve the purpose of fixing the H-section steel 7. Since the anchor bolts 2 are likely to be broken when subjected to a large shearing stress, shear piles 72 are welded to the lower ends of the steel plates 71 fixed to the H-section steel 7, and the shear piles 72 are arranged perpendicular to the steel plates 71, as shown in fig. 7. In the prior art, when a foundation is poured, a die is placed at the center of the upper end to pour a positioning hole 4 corresponding to the shear pile 72, when the H-shaped steel 7 is installed, the shear pile 72 extends into the positioning hole 4, and finally, concrete is poured in a gap between the steel plate 71 and the foundation and in the positioning hole 4, so that the purpose of bearing shear stress is achieved.

As shown in fig. 8 and 9, in order to facilitate the cooperation with the shear pile 72, a positioning hole 4 is preset in the central position of the upper end of the column 1 in the present invention, and the positioning hole 4 may be provided with two forms, namely a counter bore and a through hole 42, wherein the counter bore may be directly used for cooperation with the shear pile 72, and the through hole 42 may be used for pouring concrete when pouring the bottom of the foundation pit 5 in addition to cooperation with the shear pile 72.

As shown in fig. 10, after concrete is poured into the through holes 42, the through holes are integrally connected with the bottom foundation concrete, so that the connection between the foundation precast columns and the bottom cast-in-place concrete structure is enhanced, and the stress performance of the foundation is enhanced. Vertical reinforcing bars 41 may also be provided in the through holes 42. In addition, it should be noted that the concrete in the through hole 42 is cast twice, and the part matched with the shear pile 72 is reserved in the first casting, and after the H-shaped steel 7 is installed, the post-cast filling belt 14 is arranged between the steel plate 71 and the top of the column 1 for the second casting.

As shown in fig. 11, when concrete is secondarily poured, a steel plate 71 and a fixing bolt can be wrapped in the concrete to prevent rust.

Embodiment III:

As shown in fig. 12 and 13, the prefabricated ground beams 8 are arranged on the side surface of the column 1, and the prefabricated ground beams 8 connect two adjacent foundation prefabricated columns. The precast ground beam 8 is embedded with a ground beam connecting rib 81 in the horizontal direction, and the ground beam connecting rib 81 is connected with a foundation precast column. A foundation post-pouring belt is arranged between the end head of the prefabricated ground beam 8 and the column body 1, and the prefabricated ground beam 8 and the foundation are connected into a whole after concrete pouring.

The ground beam connecting rib 81 and the column connecting rib 11 can be connected in a binding manner, a welding manner, a straight thread sleeve 101 connection manner and other conventional fixed connection manners.

As shown in fig. 14, the end of the ground beam connecting rib 81 of the prefabricated ground beam 8 is provided with an enlarged head 103, as shown in fig. 15, the end of the column connecting rib 11 is provided with an enlarged head 103, and the ground beam connecting rib 81 and the column connecting rib 11 are connected by a sleeve 101 (the structure of the sleeve 101 and the connection mode thereof are described in the last paragraph).

Embodiment four:

As shown in fig. 16, the difference from the third embodiment is that a plurality of through holes 12 are formed on the side wall of the upper portion of the column 1, and the through holes 12 are horizontally arranged through holes or blind holes. As shown in fig. 17, the foundation structure further includes perforated ribs 13 penetrating through the through holes 12, and both ends of the perforated ribs 13 are fixedly connected with the ground beam connecting ribs 81 located at both sides thereof, respectively.

When the prefabricated ground beam 8 is arranged in a T shape, the through hole 12 with one side can be a blind hole.

Through setting up cross-under hole 12, not only make things convenient for the transportation and the installation of basic precast column, the connection of roof beam is convenient for moreover, also makes the connection of roof beam more nimble simultaneously, convenient adjustment.

As shown in fig. 17, the two ends of the perforated rib 13 are provided with enlarged heads 103, and as shown in fig. 18, the end of the ground beam connecting rib 81 is provided with the enlarged head 103, and the perforated rib 13 is connected with the ground beam connecting rib 81 by a sleeve 101.

Fifth embodiment:

The difference from the third embodiment is that, as shown in fig. 19, a post-cast filler strip 14 is provided between the steel plate 71 and the top of the column 1, and the ground beam connection ribs 81 of two adjacent prefabricated ground beams 8 are connected inside the post-cast filler strip 14. After pouring the concrete in the post-pouring filler strip 14, the precast ground beam 8 and the foundation are connected into a whole.

Further, the two ends of the ground beam connecting ribs 81 of the prefabricated ground beams 8 are provided with enlarged heads 103, and the ground beam connecting ribs 81 of two adjacent prefabricated ground beams 8 are connected by a sleeve 101.

The foundation structure does not need to make any improvement on the side surface of the foundation precast column body 1, and can also realize the connection of the precast ground beam 8 and the foundation into a whole.

Example six:

the fifth difference from the embodiment is that, as shown in fig. 20, the height of the prefabricated ground beams 8 is greater than that of the column 1, the concrete at the bottom of the column 1 is poured twice, the first pouring area 52 is positioned at the bottom, the second pouring area 53 is positioned at the top, and part of the ground beam connecting ribs 81 of two adjacent prefabricated ground beams 8 are connected in the second pouring area 53.

The construction method comprises the following steps:

as shown in fig. 21, the foundation prefabricated column is firstly arranged on the inner cushion layer of the foundation pit 5, and the reinforcement bars are bound to fix the foundation prefabricated column;

as shown in fig. 22, the first casting area 52 is cast with concrete;

As shown in fig. 23, after the concrete of the first casting area 52 is solidified, the prefabricated ground beams 8 are installed on the top of the concrete of the first casting area 52, and the ground beam connecting ribs 81 of two adjacent prefabricated ground beams 8 positioned on the upper and lower parts of the column 1 are welded or connected by a sleeve 101;

referring to fig. 24 and 20, concrete in the second casting area 53 and concrete between two adjacent prefabricated ground beams 8 are cast, and casting is stopped when the top surface of the concrete is cast to the bottom of the shear pile 72;

finally, as shown in fig. 20, the H-section steel 7 is installed, and concrete of the post-cast filler strip 14 is poured.

Embodiment seven:

The first difference from the embodiment is that, as shown in fig. 25, a portion of the rod 21 exposed from the upper surface of the column 1 is provided with a screw thread, and after the screw thread is screwed into the screw nut, the end of the rod 21 is changed into the enlarged head 103. As shown in fig. 26, the foundation structure further comprises a precast concrete column 9, wherein a bottom connecting rib 91 extending downwards is embedded at the bottom of the precast concrete column 9, an expansion head 103 is arranged at the lower end of the bottom connecting rib 91, the bottom connecting rib 91 is connected with the expansion head 103 of the foundation bolt 2 through a sleeve 101, and a post-cast strip is arranged between the bottom surface of the precast concrete column 9 and the top surface of the foundation precast column.

As shown in fig. 27, the end of the shank 21 of the anchor bolt 2 exposed to the upper surface of the column 1 is provided as an enlarged head 103. As shown in fig. 28, the bottom tie bar 91 of the precast concrete column 9 is connected to the enlarged head 103 of the anchor bolt 2 by a sleeve 101.

Example eight:

a first difference from the embodiment is that the legs 22 of the foundation prefabrication column are located inside the column 1, the bottom surface of which abuts the bottom of the foundation pit 5, as shown in fig. 29. The foundation prefabricated column arranged here has larger section size than the foundation prefabricated column in the above, the bottom of the column body 1 is not required to be buried in post-cast concrete, but is directly placed in the foundation pit 5, and the self gravity advantage of the foundation prefabricated column is utilized as a foundation.

As shown in fig. 30, the top of the foundation precast column is connected with the precast concrete column 9 by a sleeve 101.

Further, referring to fig. 31 and 32, the precast concrete column 9 is provided with a hollow 92 penetrating up and down, concrete is poured into the hollow 92 and connected with post-cast strip concrete, the column 1 is provided with a through hole 42 penetrating up and down, and concrete is poured into the through hole 42 and connected with post-cast strip concrete.

Preferably, through holes 42 and hollow 92 of precast concrete column 9 are provided with vertical bars of a through length, and a plurality of vertical bars are connected by stirrups. Thereby further reinforcing the connection between the foundation precast column and the precast concrete column 9.

As shown in fig. 33, the foundation structure may further include prefabricated ground beams 8, and ground beam connection ribs 81 of the prefabricated ground beams 8 are connected by sleeves 101.

Example nine,

The construction method of the foundation structure comprises the following installation steps:

step a, referring back to fig. 2, a foundation pit 5 is dug, a concrete cushion layer 51 is poured at the bottom of the foundation pit 5, and a reinforcing mesh is arranged on the cushion layer;

step b, lifting the foundation precast column and vertically placing the foundation precast column in the foundation pit 5;

Step c, adjusting the position of a foundation precast column to enable the rod part 21 of the foundation bolt 2 to be vertical, supporting through the supporting steel bar 3 or the foundation bolt 2, and setting temporary positioning if necessary;

step d, pouring concrete at the bottom of the foundation pit 5, so that the concrete coats the lower part of the column 1, when the shape of the foundation pit 5 is irregular, supporting die pouring can be performed, and when the limiting holes are in the form of upper and lower through holes, concrete can be directly poured through the limiting holes for pouring;

Step e, connecting the ground beam connecting ribs 81 of the prefabricated ground beams 8 with each other, or connecting the ground beam connecting ribs 81 of the prefabricated ground beams 8 with the column connecting ribs 11, or connecting the ground beam connecting ribs 81 of the prefabricated ground beams 8 with the perforated ribs 13, and pouring a post-cast strip between two adjacent prefabricated ground beams 8;

and f, backfilling the foundation pit 5 after the concrete at the bottom of the foundation pit 5 is solidified.

Example ten,

A construction method of a foundation structure, as shown in fig. 29 to 33, includes the following installation steps:

Step a, digging a foundation pit 5, and vertically placing a foundation prefabricated column in the foundation pit 5;

Step b, installing vertical steel bars in through holes 42 of the foundation prefabricated column, and binding stirrups;

step c, installing a precast concrete column 9 above the foundation precast column, and penetrating vertical steel bars into the hollow 92, wherein the precast concrete column 9 can be temporarily supported by using support blocks such as I-shaped steel;

step d, connecting an expansion head 103 at the top of the foundation precast column with an expansion head 103 at the lower part of the precast concrete column 9 by using a sleeve 101;

Step e, installing prefabricated ground beams 8 on two sides, and connecting ground beam connecting ribs 81 of the prefabricated ground beams 8 by using sleeves 101;

And f, pouring concrete on the post-cast strip between the top of the foundation precast column and the bottom of the precast concrete column 9.

The sleeve structure and the connecting method thereof are introduced:

The sleeve 101 may be a telescoping rebar sleeve or an overhanging bayonet sleeve.

( Since the above ground beam connecting bars 11, perforated bars 13, the shank portions 21 of the anchor bolts 2, and the connecting bars 81 of the prefabricated ground beam 8, and the bottom connecting bars 91 of the prefabricated concrete column 9 are provided with enlarged heads 103, the connecting bars 102 hereinafter represent all of the above. The components on both sides of the sleeve 101 are described by taking the prefabricated ground beam 8 as an example )

Necking type steel bar sleeve:

The shrinkage-type steel bar sleeve comprises a cylinder 6 and shrinkage openings 61 integrally connected to two ends of the cylinder 6, wherein a plurality of grouting holes 62 which are uniformly distributed are formed in the cylinder 6 and are convenient for cement slurry to flow into the cylinder 6, the shrinkage openings 61 are circular openings in combination with fig. 35, the inner wall of each shrinkage opening 61 is conical, one end with a larger conical surface faces the inside of the cylinder 6, the connection structure of the shrinkage-type steel bar sleeve is composed of a connecting steel bar 102 and the cylinder 6 in combination with fig. 36, one end of the connecting steel bar 102 is fixedly connected inside a prefabricated ground beam 8 in a pre-buried mode, the other end of the connecting steel bar 102 is exposed outside the prefabricated ground beam 8, an expanding head 103 is integrally connected to the end portion of one end far from the prefabricated ground beam 8, and the radial size of the outer wall of the expanding head 103 is larger than the radial size of the outer wall of the connecting steel bar 102 and smaller than the radial size of the inner wall of the shrinkage opening 61, and the expanding head 103 can extend into the cylinder 6 from the shrinkage opening 61.

As shown in fig. 37, after cement slurry flows into the cylinder 6 from the grouting holes 62 and is solidified to form concrete, the enlarged head 103 can be fixed inside the cylinder 6, and the connecting bars 102 at both ends of the cylinder 6 can be restrained from moving in the direction away from each other to pull out the cylinder 6, so that the prefabricated ground beams 8 at both ends (the rectangular block structure of the connecting bars 102 at the end far from the cylinder 6 in fig. 37 is a schematic view of the prefabricated ground beams 8) are connected, and the connection strength between the two prefabricated ground beams 8 is improved. The end of the expansion head 103 close to the connecting steel bar 102 is in a round table shape, the end of the expansion head 103 close to the prefabricated ground beam 8 is smaller than the other end, for convenience of description, the conical surface of the shrinkage 61 is defined as a transitional conical surface 611, the shrinkage 61 and the end of the cylinder 6 are integrally connected through the transitional conical surface 611, after the connecting steel bar 102 receives the acting force in the direction of pulling out the cylinder 6, the round table surface extrudes concrete, the concrete transmits the extrusion acting force (the schematic diagram in which the direction indicated by an arrow F in fig. 37 is the acting force direction) to the transitional conical surface 611, the reaction force generated by the transitional conical surface 611 has a component force along the radial direction on the expansion head 103, and the transitional conical surface 611 compresses the expansion head 103 along the radial direction, so that the cylinder 6 and the concrete in the interior bear larger load, and the connection strength between the connecting steel bar 102 and the expansion head 103 and the cylinder 6 is improved.

Compared with the existing grouting sleeve, the grouting sleeve does not need separate grouting operation, but when concrete is poured, the concrete slurry enters the cylinder 6 to complete connection of the connecting steel bars 102, so that the grouting sleeve is more convenient to operate, does not need special grouting materials, and saves cost. In addition, because the scheme is based on pressure transmission, the grouting sleeve is more reliable in connection by means of bonding engagement between grouting materials and reinforcing steel bars.

The shape of the necking 61 can be round, square, long strip, ellipse and other shapes, and the section of the expansion head 103 is matched with the shape of the necking 61. In order to effectively transmit the pressure of the enlarged head 103 to the cylinder 6 through the concrete, the size of the shrinkage 61 is 1 to 5mm larger than the size of the enlarged head 103, preferably 2 to 3mm.

As shown in fig. 38 and 39, the cylinder 6 has a split structure that can be split into two halves in the axial direction. The connecting plates 63 are fixedly connected to the outer side surfaces of one ends, close to each other, of the two half cylinder bodies 6, connecting holes 631 are formed in the connecting plates 63, after the two half cylinder bodies 6 are mutually abutted and spliced, the connecting holes 631 in the connecting plates 63 can be mutually aligned, and through the fact that bolt pieces such as pins or bolts are simultaneously inserted into the two mutually aligned connecting holes 631, the two connecting plates 63 are pinned, and the two half cylinder bodies 6 are limited to be separated from each other in the direction away from each other.

When the distance between the two prefabricated ground beams 8 is smaller, the distance between the end faces of the ends, close to each other, of the connecting steel bars 102 embedded in the prefabricated ground beams 8 is also smaller, the cylinder 6 can be split into two halves, one half of the cylinder 6 is sleeved on one connecting steel bar 102, the other half of the cylinder 6 is sleeved on the connecting steel bar 102, and finally the two half of the cylinder 6 slides along the axial direction of the connecting steel bar 102 and towards the direction close to each other, so that the connecting holes 631 on the connecting plates 63 are aligned with each other, and the two half of the cylinder 6 are spliced together by inserting the bolt pieces into the connecting holes 631.

As shown in fig. 40, when two bars in a vertical state are connected, in order to more conveniently and temporarily fix the sleeve 101 at the abutting position of the two connection bars 102 before casting concrete, it is not possible to slip off. Therefore, a baffle element 64 for preventing the expansion head 103 from penetrating through the sleeve 101 is fixedly connected to the middle part of the inner wall of the cylinder 6. The baffle member 64 may be a disk plate positioned in the middle of the cartridge 6. Further, in order to allow free flow of cement slurry within the cylinder 6, the baffle element 64 is arranged in a hollow annular shape with an inner diameter smaller than the diameter of the enlarged head 103. Alternatively, the blocking element 64 may be a rod arranged in the radial direction of the cylinder 6.

Extend into fastener formula sleeve outward:

As shown in fig. 41 and 42, the sleeve with the outward protruding clamping piece comprises a cylinder 6, clamping blocks 65 and elastic pieces 66, clamping holes 651 for inserting the clamping blocks 65 are formed in two ends of the cylinder 6, and grouting holes 62 are formed in the cylinder 6. One end of the elastic sheet 66 is fixedly connected with the outer side surface of the cylinder 6, and the other end of the elastic sheet 66 is fixedly connected with one end of the clamping block 65 positioned on the outer side of the cylinder 6.

One end of the connecting steel bar 102 is fixedly connected with an expansion head 103, the radial size of the expansion head 103 is larger than that of the connecting steel bar 102, and the expansion head 103 can be inserted into the cylinder 6 from the port of the cylinder 6. In the insertion process, when the expansion head 103 pushes the clamping block 65 to move in a direction away from the central axis of the cylinder 6, the elastic sheet 66 is driven to elastically deform, and after the expansion head 103 passes over the clamping block 65, the elastic sheet 66 gradually recovers to deform and is inserted into the cylinder 6 to reset, so that the expansion head 103 is limited to be pulled out of the cylinder 6.

When the post-cast strip around the cylinder 6 is poured with concrete, cement paste can flow into the cylinder 6 from two ports of the cylinder 6 and the grouting holes 62, and after the cement paste is solidified, solid concrete is formed, so that the connecting steel bars 102 are fixed in the cylinder 6, and the connection of the two connecting steel bars 102 is realized.

Furthermore, it should be noted that the sleeve may employ 4 sleeve-related patents filed by the present inventor in 2018, 4/8, with application numbers 201810306670.4, 201810307419.X, 201810307420.2, and 201810307967.2, respectively.

The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.

Claims

1. A foundation structure, characterized in that it comprises a prefabricated foundation column, the prefabricated foundation column comprising a column body (1) and an anchor bolt (2), the anchor bolt (2) being vertically cast in the column body (1), the anchor bolt (2) comprising a rod (21) and a support leg (22) perpendicular to the rod (21), the upper portion of the rod (21) extending out of the column body (1) and being placed above the column body (1);

The rod portion (21) of the anchor bolt (2) extends downwardly out of the bottom surface of the column (1), and the support foot (22) is located outside the column (1);

A plurality of vertical supporting steel bars (3) are arranged at the bottom of the column (1), and the upper ends of the supporting steel bars (3) are cast inside the column (1);

The column (1) is a reinforced concrete structure with steel bars arranged inside;

The supporting foot (22) faces the outside of the column (1);

A positioning hole (4) is provided at the center of the upper end of the column (1);

The positioning hole (4) is a through-hole structure that penetrates the column (1);

A plurality of through holes (12) are provided on the upper side wall of the column (1), wherein the through holes (12) are horizontally arranged through holes or blind holes;

The portion of the rod (21) exposed on the upper surface of the column (1) is provided with a thread, and when a nut is screwed into the thread, the end of the rod becomes an enlarged head (103);

The bottom of the column (1) is buried in the cast-in-place foundation concrete;

The top of the column (1) is connected to the steel column;

A connecting steel plate (71) is provided on the bottom surface of the steel column, and the steel plate (71) is bolted to the top of the column body (1);

A shear pile (72) is vertically fixed to the bottom surface of the steel plate (71), and the shear pile (72) extends into the positioning hole (4);

A post-cast filling strip (14) is provided between the steel plate (71) and the top of the column (1);

Concrete is poured around the steel plate (71) and the fixing bolts to wrap the connection parts to prevent rust;

A reinforcing steel bar (41) is vertically arranged in the positioning hole (4), and concrete is poured; the concrete structure in the positioning hole (4) is cast in two steps, and during the first casting, a portion that cooperates with the shear pile is reserved; after the steel column is installed, the shear pile is inserted into the reserved portion of the positioning hole (4), and the positioning hole (4) is cast for a second time, and a post-cast filling strip (14) is arranged between the top of the column body (1) and cast synchronously to form an integral structure.

2. The foundation structure according to claim 1 is characterized in that it also includes a prefabricated ground beam (8) arranged on the side of the column (1), and the prefabricated ground beam (8) connects two adjacent prefabricated foundation columns.

3. The foundation structure according to claim 2 is characterized in that the prefabricated ground beam (8) is pre-buried with ground beam connecting ribs (81) in the horizontal direction, and the ground beam connecting ribs (81) are connected to the prefabricated foundation columns.

4. The foundation structure according to claim 3, characterized in that the ground beam connecting ribs (81) are fixedly connected to the column connecting ribs.

5. The foundation structure according to claim 4, characterized in that the end of the column connecting rib is an enlarged head (103), the end of the ground beam connecting rib (81) is provided with an enlarged head (103), and the ground beam connecting rib (81) and the column connecting rib are connected by a sleeve (101).

6. The foundation structure according to claim 3, characterized in that it also comprises perforated bars (13) passing through the through-holes, the perforated bars (13) being fixedly connected to the ground beam connecting bars (81).

7. The foundation structure according to claim 6, characterized in that both ends of the perforated bar (13) are provided with enlarged heads (103), the end of the ground beam connecting bar (81) is an enlarged head (103), and the perforated bar (13) and the ground beam connecting bar (81) are connected with a sleeve (101).

8. The infrastructure according to claim 3 is characterized in that it also includes a precast concrete column (9), the bottom surface of the precast concrete column is provided with a bottom connecting bar (91), the end of the precast concrete column is an enlarged head (103), and the enlarged head (103) of the precast concrete column is connected to the enlarged head (103) at the top of the column body (1) by a sleeve (101).

9. The foundation structure according to claim 3, characterized in that a post-cast filling strip (14) is provided between the steel plate (71) and the top of the column (1), and the ground beam connecting ribs (81) of two adjacent prefabricated ground beams (8) are connected inside the post-cast filling strip (14).

10. The foundation structure according to claim 9, characterized in that both ends of the ground beam connecting ribs (81) of the prefabricated ground beams (8) are provided with enlarged heads (103), and the ground beam connecting ribs (81) of two adjacent prefabricated ground beams (8) are connected by sleeves (101).

11. The foundation structure according to claim 3 is characterized in that the height of the prefabricated ground beam (8) is greater than the height of the column (1), and the concrete at the bottom of the column (1) is poured in two times, the first pouring area (52) is located at the bottom, and the second pouring area (53) is located at the top; and part of the ground beam connecting bars (81) of two adjacent prefabricated ground beams (8) are connected in the second pouring area (53).

12. A method for constructing a foundation structure, characterized in that: constructing the foundation structure as claimed in claim 1 comprises the following installation steps:

Step a, digging a foundation pit (5), and pouring a concrete cushion layer (51) at the bottom of the foundation pit (5);

Step b, vertically placing the prefabricated foundation column in the foundation pit (5); the prefabricated column comprises a column body (1), a positioning hole (4) is provided at the center of the upper end of the column body (1); the positioning hole (4) is a through hole structure penetrating the column body (1); a vertical reinforcing steel bar (41) is provided in the through hole;

Step c, adjusting the position of the prefabricated foundation column and reinforcing it so that the rod (21) of the anchor bolt (2) remains vertical;

Step d, pouring concrete at the bottom of the foundation pit (5) so that the concrete covers the lower part of the column (1), and pouring concrete into the positioning hole (4) at the same time, and stopping when the pouring is completed with a portion reserved for the shear pile;

Step e, backfilling the foundation pit (5) after the concrete at the bottom of the foundation pit (5) solidifies;

Step f: After the steel column is installed, the shear pile is inserted into the reserved part of the positioning hole (4), the positioning hole (4) is cast for a second time, and a post-cast filling belt (14) is provided between the top of the column body (1) and cast and formed synchronously.

13. A construction method for a foundation structure according to claim 12, characterized in that it also comprises step d-1, connecting the ground beam connecting bars (81) of the prefabricated ground beams (8) to each other, and pouring a post-cast strip between two adjacent prefabricated ground beams (8).