A prefabricated foundation column and its connection structure and construction method

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

Technical Field

[0001] The invention relates to a building foundation, in particular to a prefabricated foundation column and a connection structure thereof and a construction method thereof. Background Art

[0002] The foundation is a structural component that transfers the various forces borne by the structure to the foundation. When the top of the foundation is connected to the steel structure column, it is necessary to embed the anchor bolts in the foundation. In the common foundation construction process, the anchor bolts must be fixed vertically in the foundation pit first, and then the foundation steel bars are tied, the formwork is installed, and finally the concrete is poured. Because the anchor bolts are easily offset and tilted under the interference of external forces during concrete pouring, the position deviation of the exposed screws on the top exceeds the specification requirements, making it difficult to install the steel structure column and seriously affecting the connection quality with the steel structure column. Even if adjustments are made later, it is impossible to meet the bearing capacity requirements of the original design, and the adjustments are time-consuming and laborious, which will also affect the construction period. Summary of the invention

[0003] The object of the present invention is to provide a prefabricated foundation column, which can reduce the deviation of the position of the anchor bolts during the foundation pouring process.

[0004] The above technical purpose of the present invention is achieved through the following technical scheme: a prefabricated foundation column, including a column body and anchor bolts, the anchor bolts are vertically cast in the column body, the anchor bolts include a rod and a support foot perpendicular to the rod, and the upper part of the rod extends out of the column body and is placed above the column body.

[0005] A second object of the present invention is to provide a connection structure for prefabricated foundation columns, in which the anchor bolts are more accurately positioned and have a high installation quality.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a prefabricated foundation column, comprising a column body and anchor bolts, the anchor bolts are vertically cast in the column body, the anchor bolts include a rod and a support leg perpendicular to the rod, the upper part of the rod extends out of the column body and is placed above the column body, and the bottom of the column body is buried in the cast-in-place foundation concrete.

[0007] By adopting the above technical solution, the anchor bolts will not be offset or tilted during the concrete pouring process, thus avoiding deviation.

[0008] The third object of the present invention is to provide a construction method for a foundation structure, which has simple installation steps and efficient construction.

[0009] The above technical objectives of the present invention are achieved through the following technical solutions:

[0010] A method for installing a prefabricated foundation column comprises the following installation steps:

[0011] Step a, digging a foundation pit, and pouring a concrete cushion layer at the bottom of the foundation pit;

[0012] Step b, placing the prefabricated foundation columns vertically in the foundation pit;

[0013] Step c: Adjust the position of the prefabricated foundation column to keep the stem of the anchor bolt vertical;

[0014] Step d, pouring concrete at the bottom of the foundation pit so that the concrete covers the lower part of the main body;

[0015] Step e: backfill the foundation pit after the concrete at the bottom of the foundation pit solidifies.

[0016] By adopting the above technical solution, the anchor bolts will not shift or tilt during the concrete pouring process, thus avoiding deviations. There is no need to install side formwork, and the construction is fast and efficient.

[0017] In summary, the present invention has the following technical effects:

[0018] 1. Precast the anchor bolts in the precast foundation columns. When constructing the foundation, place the precast foundation columns vertically in the foundation pit and pour concrete at the bottom of the foundation pit. Since the anchor bolts are fixed in the column, the anchor bolts can be prevented from shifting and tilting when pouring concrete below. At the same time, the construction of the foundation through precast foundation columns is easy to construct and can save construction time;

[0019] 2. The lower part of the anchor bolt is cast in the column to meet the force requirements of the anchor bolt, and at the same time, the amount of anchor bolts can be reduced, saving costs; the support steel bars at the bottom of the column can be used as support for the pillars, which is convenient for adjustment. At the same time, after the concrete is poured in the foundation pit, the support steel bars can play a role in strengthening the bearing capacity of the foundation. At the same time, since the cost of anchor bolts is relatively high, this method can save the amount of anchor bolts and save costs;

[0020] 3. The foundation structure is connected with the prefabricated ground beam / prefabricated concrete column as a whole, which has better stress and earthquake resistance performance;

[0021] 4. Using this method, there is no need to install formwork, the construction is fast and efficient, and the construction period is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the prefabricated foundation column structure;

[0023] Figure 2 This is the schematic diagram of the installation of the prefabricated foundation columns;

[0024] Figure 3 It is a schematic diagram of the cross section of the precast foundation column;

[0025] Figure 4It is a structural diagram of the prefabricated foundation column with the anchor bolt support foot located inside the column;

[0026] Figure 5 It is a schematic diagram of a precast foundation column with internal reinforcement;

[0027] Figure 6 This is a schematic diagram of a precast foundation column with its legs located outside the column;

[0028] Figure 7 It is a schematic diagram of the installation of a prefabricated foundation column with positioning holes;

[0029] Figure 8 It is a schematic diagram of the structure of a prefabricated foundation column provided with positioning holes;

[0030] Fig. 9 It is a schematic diagram of the structure of the basic prefabricated column with the positioning hole being a through hole;

[0031] Fig.10 It is a schematic diagram of the structure of the first pouring of concrete in the through hole;

[0032] Fig.11 It is a schematic diagram of the structure of pouring concrete for the second time in the through hole and wrapping the bolts;

[0033] Fig.12 It is a schematic diagram of the basic prefabricated column structure with column connecting reinforcements set on the side;

[0034] Fig.13 It is a schematic diagram of the connection between the prefabricated foundation column and the prefabricated ground beam with column connecting reinforcements set on the side;

[0035] Fig.14 It is a schematic diagram of a prefabricated column structure in which an enlarged head is provided for the column connecting reinforcement;

[0036] Fig.15 It is a schematic diagram of the connection between the column connecting reinforcement with an enlarged head and the prefabricated ground beam sleeve;

[0037] Fig.16 It is a schematic diagram of the structure of a prefabricated foundation column with through holes set on the side;

[0038] Fig.17 It is a structural diagram of the perforated reinforcement passing through the penetration hole to connect the ground beams on both sides;

[0039] Fig.18 It is a structural schematic diagram of a perforated rib that is provided with an enlarged head and then connected with a sleeve;

[0040] Fig.19 It is a structural schematic diagram of the ground beam connecting reinforcement with an enlarged head being directly connected with a sleeve;

[0041] Fig. 20 It is a schematic diagram of the structure of the high prefabricated ground beams on both sides connected to each other;

[0042] Fig.21 It is the first construction step of connecting the high prefabricated ground beams on both sides;

[0043] Fig. 22 It is the second construction step of connecting the high prefabricated ground beams on both sides;

[0044] Fig.23 The third construction step is to connect the high prefabricated ground beams on both sides to each other;

[0045] Fig.24 The fourth construction step is to connect the high prefabricated ground beams on both sides;

[0046] Fig.25 It is a schematic diagram of the structure of a prefabricated foundation column in which the rod thread becomes an enlarged head after the nut is screwed on;

[0047] Fig.26 It is a schematic diagram of the connection structure between the nut enlarged head and the reinforcement sleeve at the bottom of the precast concrete column;

[0048] Fig. 27 It is a schematic diagram of the structure of a prefabricated foundation column with an enlarged head at the end of the rod;

[0049] Fig.28 It is a schematic diagram of the connection structure between the enlarged head and the reinforcement sleeve at the bottom of the precast concrete column;

[0050] Fig.29 It is a schematic diagram of the structure of the prefabricated foundation column which is set close to the bottom of the foundation;

[0051] Fig.30 It is a schematic diagram of the connection structure between the precast foundation column and the precast concrete column sleeve;

[0052] Fig.31 It is a structural schematic diagram of installing vertical steel bars in the through holes of prefabricated foundation columns;

[0053] Fig.32 It is a schematic diagram of the connection structure between the precast foundation column and the hollow precast concrete column;

[0054] Fig.33 It is a schematic diagram of the connection structure between the precast foundation column, the hollow precast concrete column and the precast ground beam;

[0055] Fig.34 It is a structural schematic diagram of the cylinder in the shrink-type steel bar connection sleeve;

[0056] Fig.35 It is a schematic diagram of the end face of the shrinkage;

[0057] Fig.36 It is a schematic diagram of the matching between the sleeve and the connecting steel bar;

[0058] Fig.37It is a schematic diagram of the connection relationship between the shrink-type steel bar connection sleeve and the prefabricated column;

[0059] Fig.38 It is a schematic diagram of the structure of the split cylinder;

[0060] Fig.39 It is a schematic diagram of the connection relationship between the split cylinder and the prefabricated column;

[0061] Fig.40 It is a schematic diagram of the structure in which the sleeve is connected to two steel bars in a vertical state;

[0062] Fig.41 It is a schematic diagram of the structure extending outward into the card-type sleeve;

[0063] Fig.42 It is an assembly diagram of the externally extending clip-type sleeve and the connecting steel bar.

[0064] Figure numerals: 1, column; 11, column connecting rib; 12, through hole; 13, perforated rib; 14, post-cast filling strip; 2, anchor bolt; 21, rod; 22, support foot; 3, support steel bar; 4, positioning hole; 41, reinforcing steel bar; 42, through hole; 5, foundation pit; 51, concrete cushion; 52, first pouring area; 53, second pouring area; 6, cylinder; 61, shrinkage; 611, transition circle Conical surface; 62, grouting hole; 63, connecting plate; 631, connecting hole; 64, barrier element; 65, snap-in block; 651, snap-in hole; 66, spring piece; 7, H-shaped steel; 71, steel plate; 72, shear pile; 8, precast ground beam; 81, ground beam connecting reinforcement; 9, precast concrete column; 91, bottom connecting reinforcement; 92, hollow; 101, sleeve; 102, connecting reinforcement; 103, enlarged head. DETAILED DESCRIPTION

[0065] The present invention will be further described in detail below with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "bottom" and "top" used in the following description refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0066] When constructing the building foundation, firstly, the anchor bolts 2 need to be vertically fixed in the foundation pit 5, and then the formwork is supported and concrete is poured to form the foundation. When pouring concrete, the anchor bolts 2 are prone to displacement and tilt, resulting in deviation in the position of the anchor bolts 2, which cannot meet the building requirements. Later adjustments are time-consuming and laborious and easily cause the anchor bolts 2 to be unstable. In order to solve the above problems, a foundation prefabricated column is designed to prevent the anchor bolts 2 from tilting and shifting. The specific structure is as follows:

[0067] Embodiment 1:

[0068] A precast foundation column, such as Figure 1 As shown, it includes a column 1 and an anchor bolt 2. The anchor bolt 2 is cast inside the column 1 and includes a vertically arranged rod 21 and a support leg 22 perpendicular to the rod 21. The rod 21 and the support leg 22 are an integrally formed structure. The upper end of the rod 21 extends out of the column 1 and is placed above the column 1. The top part of the rod 21 can be a bolt head. The rod 21 of the anchor bolt 2 extends downward from the bottom surface of the column 1, and the support leg 22 is located outside the column 1.

[0069] like Figure 2 As shown, during installation, a cushion layer is poured at the bottom of the foundation pit 5 and a steel mesh is arranged, and then the prefabricated foundation column is hoisted into the foundation pit 5. After adjusting the position and height, the support leg 22 is connected and fixed to the steel mesh, and finally concrete is poured at the bottom of the foundation pit 5 so that the poured concrete covers the bottom of the column 1. After the concrete solidifies, the foundation pit 5 is backfilled to complete the construction of the foundation.

[0070] Since the anchor bolts 2 are pre-buried inside the column 1, the relative positions of the rod 21 and the bolt head are fixed during prefabrication, and the position accuracy is higher than that of tying the anchor bolts 2 individually on site. Moreover, after the prefabricated foundation column is installed and fixed, the structure is stable, and it is difficult for external forces during the pouring process to affect its position. Therefore, after the entire foundation construction is completed, the position deviation of the anchor bolts 2 is well controlled with high accuracy, thereby improving the construction quality of the foundation.

[0071] In addition, in the original foundation construction process, it is necessary to install a template before pouring concrete, and because the foundation has a large lower part and a small upper part, the template installation is complicated and time-consuming. However, using this method, there is no need to install a template, and concrete can be poured into the bottom of the foundation pit 5 so that it wraps the bottom of the column 1. Therefore, this method also has the advantages of fast and efficient construction and can save construction time.

[0072] like Figure 3 As shown, the column 1 can be in the form of a prism or a cylinder, and there are a plurality of anchor bolts 2 arranged in a circular array with the axis of the column 1 as the center.

[0073] When the designed foundation height is large, the height of the column 1 needs to be increased accordingly. However, since the material of the anchor bolt 2 is more expensive than that of ordinary steel bars, the arrangement of the support foot 22 outside the column 1 will cause material waste. Figure 4 As shown, the lower part of the rod 21 and the support leg 22 are both arranged inside the column 1. Preferably, the support leg 22 is arranged inward. A plurality of support steel bars 3 are fixedly arranged at the lower end of the column 1. The support steel bars 3 are arranged vertically, and their upper ends are cast in the column 1, and the lower ends of the support steel bars 3 are kept flush. The support steel bars 3 can be straight bars or can be Figure 4As shown in FIG, the bottom of the supporting steel bar 3 is turned outward or inward to facilitate support and fixation.

[0074] The supporting steel bars 3 can also be used as the internal vertical force-bearing steel bars of the column 1. Figure 5 As shown, the column 1 is a reinforced concrete structure, with vertical force-bearing steel bars and stirrups arranged inside. There are two types of stirrups, one for hooping the vertical force-bearing steel bars (which may be the supporting steel bars 3 ), and the other for hooping the anchor bolts 2 .

[0075] like Figure 6 As shown, when the support foot 22 of the anchor bolt 2 is located outside the column 1, the anchor bolt 2 can be used as the vertical force-bearing reinforcement of the column 1, and stirrups can be arranged around the anchor bolt 2.

[0076] When the foot 22 of the anchor bolt 2 is located outside the column 1, it can be set to be turned outward or inward. When it is set to be turned outward, the force-bearing structure is better, and the inward setting is more convenient for the processing and transportation of the foundation prefabricated column.

[0077] Embodiment 2:

[0078] Replay Figure 2 The foundation is connected to the steel plate 71 fixed at the bottom of the H-shaped steel 7 by the anchor bolts 2 to achieve the purpose of fixing the H-shaped steel 7. Since the anchor bolts 2 are prone to breakage when subjected to large shear stress, Figure 7 As shown, a shear pile 72 is welded to the lower end of the steel plate 71 fixed to the H-shaped steel 7, and the shear pile 72 is arranged perpendicular to the steel plate 71. In the prior art, when the foundation is poured, a mold is placed at the center of the upper end to pour a positioning hole 4 corresponding to the shear pile 72, and when the H-shaped steel 7 is installed, the shear pile 72 is extended into the positioning hole 4, and finally concrete is poured in the gap between the steel plate 71 and the foundation and in the positioning hole 4 to achieve the purpose of bearing shear stress.

[0079] like Figure 8 and Fig. 9 As shown, in order to facilitate the cooperation with the shear pile 72, a positioning hole 4 is preset at the center position of the upper end of the column 1 in the present invention. The positioning hole 4 can be set in two forms: a countersunk hole and a through hole 42. The countersunk hole can be directly used to cooperate with the shear pile 72, and the through hole 42 can not only cooperate with the shear pile 72 but also be used for pouring concrete when pouring the bottom of the foundation pit 5.

[0080] like Fig.10As shown, after pouring concrete in the through hole 42, it is connected to the bottom foundation concrete to form a whole, strengthening the connection between the foundation prefabricated column and the bottom cast-in-place concrete structure, and enhancing the bearing capacity of the foundation. Vertical reinforcing steel bars 41 can also be set in the through hole 42. In addition, it should be pointed out that the concrete in the through hole 42 is poured twice. During the first pouring, a portion is reserved to cooperate with the shear pile 72; after the H-shaped steel 7 is installed, a post-cast filling strip 14 is set between the steel plate 71 and the top of the column 1 for secondary pouring.

[0081] like Fig.11 As shown, during the secondary pouring of concrete, the steel plate 71 and the fixing bolts can be wrapped into the concrete to prevent them from rusting.

[0082] Embodiment three:

[0083] The difference from the first embodiment is that Fig.12 and Fig.13 As shown, 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. The prefabricated ground beam 8 is pre-buried with a ground beam connecting rib 81 in the horizontal direction, and the ground beam connecting rib 81 is connected to the prefabricated foundation column. A foundation post-cast strip is arranged between the end of the prefabricated ground beam 8 and the column 1. After the concrete is poured, the prefabricated ground beam 8 is connected to the foundation as a whole.

[0084] The ground beam connecting ribs 81 and the column connecting ribs 11 can be connected by conventional fixed connection methods such as binding connection, welding, and straight threaded sleeve 101 connection.

[0085] like Fig.14 As shown, the end of the ground beam connecting rib 81 of the prefabricated ground beam 8 is configured as an enlarged head 103, as shown in FIG. Fig.15 As shown, the end of the column connecting rib 11 is an enlarged head 103, and the ground beam connecting rib 81 is connected to the column connecting rib 11 by a sleeve 101 (the structure of the sleeve 101 and its connection method are described in the last paragraph).

[0086] Embodiment 4:

[0087] like Fig.16 As shown, the difference from the third embodiment is that a plurality of through holes 12 are provided on the upper side wall of the column 1, and the through holes 12 are horizontally arranged through holes or blind holes. Fig.17 As shown, the foundation structure further includes a perforated rib 13 passing through the through hole 12, and two ends of the perforated rib 13 are respectively fixedly connected to the ground beam connecting ribs 81 located on both sides thereof.

[0088] When the prefabricated ground beam 8 is arranged in a T-shape, the through-hole 12 on one side may be a blind hole.

[0089] The provision of the through-holes 12 not only facilitates the transportation and installation of the prefabricated foundation columns, but also facilitates the connection of the ground beams, and also makes the connection of the ground beams more flexible and convenient to adjust.

[0090] like Fig.17 As shown, both ends of the perforated rib 13 are provided with enlarged heads 103, as shown in FIG. Fig.18 As shown, the end of the ground beam connecting rib 81 is an enlarged head 103 , and the perforated rib 13 is connected to the ground beam connecting rib 81 by a sleeve 101 .

[0091] Embodiment five:

[0092] The difference from the third embodiment is that Fig.19 As shown, 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. After the post-cast filling strip 14 is poured with concrete, the prefabricated ground beam 8 and the foundation are connected as a whole.

[0093] Furthermore, both ends of the ground beam connecting ribs 81 of the prefabricated ground beam 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 .

[0094] This basic structure does not require any improvement to the side of the prefabricated foundation column body 1, and can also realize the connection of the prefabricated ground beam 8 and the foundation into a whole.

[0095] Embodiment six:

[0096] The difference from the fifth embodiment is that Fig. 20 As shown, the height of the precast ground beam 8 is greater than that of the column 1 , and the concrete at the bottom of the column 1 is poured twice, the first pouring area 52 is at the bottom, and the second pouring area 53 is at the top; some ground beam connecting bars 81 of two adjacent precast ground beams 8 are connected in the second pouring area 53 .

[0097] The construction steps are as follows:

[0098] like Fig.21 As shown, the prefabricated foundation columns are first installed on the cushion layer in the foundation pit 5, and the steel bars are tied to fix the prefabricated foundation columns;

[0099] like Fig. 22 As shown, pouring concrete in the first pouring area 52;

[0100] like Fig.23 As shown, after the concrete of the first pouring area 52 solidifies, the prefabricated ground beam 8 is installed on the top of the concrete of the first pouring area 52, and the ground beam connecting ribs 81 of two adjacent prefabricated ground beams 8 located at the upper and lower parts of the column 1 are welded or connected by sleeves 101;

[0101] Combination Fig.24 and Fig. 20 , pour the concrete in the second pouring area 53 and the concrete between the two adjacent precast ground beams 8, and stop pouring when the top surface of the concrete is poured to the bottom of the shear pile 72;

[0102] Finally, if Fig. 20 As shown, the H-shaped steel 7 is installed, and the concrete of the post-cast filling zone 14 is poured.

[0103] Embodiment seven:

[0104] The difference from the first embodiment is that, Fig.25 As shown, the portion of the rod 21 exposed on the upper surface of the column 1 is provided with a thread, and the end of the rod 21 is transformed into an enlarged head 103 after the nut is screwed into the thread. Fig.26 As shown, the foundation structure also includes a precast concrete column 9, and a bottom connecting bar 91 extending downward is embedded in the bottom of the precast concrete column 9, and the lower end of the bottom connecting bar 91 is set as an enlarged head 103; the bottom connecting bar 91 is connected to the enlarged head 103 of the anchor bolt 2 by a sleeve 101; a post-cast strip is set between the bottom surface of the precast concrete column 9 and the top surface of the foundation precast column.

[0105] like Fig. 27 As shown, the end of the rod portion 21 of the anchor bolt 2 exposed on the upper surface of the column 1 is configured as an enlarged head 103. Fig.28 As shown, the bottom connecting bar 91 of the precast concrete column 9 is connected to the enlarged head 103 of the anchor bolt 2 by a sleeve 101.

[0106] Embodiment eight:

[0107] The difference from the first embodiment is that, Fig.29 As shown, the support leg 22 of the prefabricated foundation column is located inside the column body 1, and the bottom surface of the prefabricated foundation column is in contact with the bottom of the foundation pit 5. The prefabricated foundation column provided here has a larger cross-sectional size than the prefabricated foundation column described above, and the bottom of the column body 1 does not need to be buried in the post-poured concrete, but is directly placed in the foundation pit 5, using its own gravity advantage as a foundation.

[0108] like Fig.30 As shown, the top of the prefabricated foundation column is connected to the prefabricated concrete column 9 by a sleeve 101.

[0109] Furthermore, combined with Fig.31 and 32 The precast concrete column 9 is provided with a hollow 92 which runs through from top to bottom; concrete is poured into the hollow 92 and connected with the post-cast concrete; the column body 1 is provided with a through hole 42 which runs through from top to bottom, concrete is poured into the through hole 42 and connected with the post-cast concrete.

[0110] Preferably, vertical steel bars are arranged in the through hole 42 and the hollow 92 of the precast concrete column 9, and a plurality of vertical steel bars are connected by stirrups, so as to further strengthen the connection between the foundation precast column and the precast concrete column 9.

[0111] like Fig.33 As shown, the infrastructure may further include prefabricated ground beams 8 , and ground beam connecting ribs 81 of the prefabricated ground beams 8 are connected by sleeves 101 .

[0112] Embodiment 9:

[0113] A construction method for a foundation structure comprises the following installation steps:

[0114] Step a: Review Figure 2 , digging a foundation pit 5, pouring a concrete cushion layer 51 at the bottom of the foundation pit 5 and arranging a steel mesh on the cushion layer;

[0115] Step b, hoisting the prefabricated foundation column and placing it vertically in the foundation pit 5;

[0116] Step c, adjust the position of the prefabricated foundation column to keep the rod 21 of the anchor bolt 2 vertical, support it through the support steel bar 3 or the anchor bolt 2, and set a temporary positioning when necessary;

[0117] Step d, pouring concrete at the bottom of the foundation pit 5 so that the concrete covers the lower part of the column 1. When the foundation pit 5 is irregular in shape, formwork can be used for pouring. 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;

[0118] Step e, connecting the ground beam connecting ribs 81 of the prefabricated ground beam 8 to each other, or connecting the ground beam connecting ribs 81 of the prefabricated ground beam 8 to the column connecting ribs 11, or connecting the ground beam connecting ribs 81 of the prefabricated ground beam 8 to the perforated ribs 13, and pouring the post-cast strip between two adjacent prefabricated ground beams 8;

[0119] Step f: backfill the foundation pit 5 after the concrete at the bottom of the foundation pit 5 solidifies.

[0120] Embodiment 10

[0121] A construction method for a foundation structure, such as Figure 29-Figure 33 As shown, the installation steps include the following:

[0122] Step a, digging a foundation pit 5, and vertically placing the prefabricated foundation columns in the foundation pit 5;

[0123] Step b, installing vertical steel bars in the through holes 42 of the prefabricated foundation columns and tying stirrups;

[0124] Step c, install the precast concrete column 9 above the precast foundation column, and insert the vertical steel bar into the hollow 92; the precast concrete column 9 can be temporarily supported by supporting blocks such as I-beams;

[0125] Step d, connecting the enlarged head 103 at the top of the prefabricated foundation column with the enlarged head 103 at the bottom of the prefabricated concrete column 9 with the sleeve 101;

[0126] Step e, installing the prefabricated ground beams 8 on both sides, and connecting the ground beam connecting ribs 81 of the prefabricated ground beams 8 with sleeves 101;

[0127] Step f: pour concrete into the post-cast strip between the top of the precast foundation column and the bottom of the precast concrete column 9.

[0128] Introduction to sleeve structure and its connection method:

[0129] The sleeve 101 can be a shrink-fitting steel bar sleeve or an outward extending clamping piece sleeve.

[0130] (Since the ground beam connecting reinforcement 11, the perforated reinforcement 13, the rod 21 of the anchor bolt 2, the connecting reinforcement 81 of the precast ground beam 8, and the bottom connecting reinforcement 91 of the precast concrete column 9 are all provided with enlarged heads 103, the connecting reinforcement 102 in the following description represents all the above reinforcements. The components on both sides of the sleeve 101 are described by taking the precast ground beam 8 as an example)

[0131] Shrink type steel sleeve:

[0132] like Fig.34 As shown, the shrinkage type steel sleeve includes a cylinder 6 and a shrinkage 61 integrally connected to both ends of the cylinder 6. The cylinder 6 is provided with a plurality of evenly distributed grouting holes 62 to facilitate the cement slurry to flow into the cylinder 6; Fig.35 The constriction 61 is a circular opening, the inner wall of the constriction 61 is a conical surface, and the larger end of the conical surface faces the inside of the cylinder 6; Fig.36 The connection structure of the necked steel bar sleeve is composed of a connecting steel bar 102 and a cylinder body 6. One end of the connecting steel bar 102 is embedded and fixedly connected inside the prefabricated ground beam 8, and the other end is exposed outside the prefabricated ground beam 8 and is integrally connected with an enlarged head 103 at the end away from the prefabricated ground beam 8. The radial dimension of the outer wall of the enlarged head 103 is larger than the radial dimension of the outer wall of the connecting steel bar 102 and smaller than the radial dimension of the inner wall of the necking 61. The enlarged head 103 can extend into the cylinder body 6 from the necking 61.

[0133] like Fig.37 As shown, after the cement slurry flows into the cylinder 6 from the grouting hole 62 and solidifies to form concrete, the enlarged head 103 can be fixed inside the cylinder 6 to limit the connecting steel bars 102 at both ends of the cylinder 6 from moving away from each other and pulling out the cylinder 6, thereby Fig.37The rectangular block structure at one end of the connecting steel bar 102 away from the cylinder 6 is a schematic diagram of the prefabricated ground beam 8) to improve the connection strength between the two prefabricated ground beams 8. The end of the enlarged head 103 close to the connecting steel bar 102 is in the shape of a truncated cone, and the end of the enlarged head 103 close to the prefabricated ground beam 8 is smaller than the other end; for the convenience of description, the conical surface of the necking 61 is defined as a transition conical surface 611, and the necking 61 and the end of the cylinder 6 are connected as a whole through the transition conical surface 611. After the connecting steel bar 102 is subjected to the force in the direction of pulling out the cylinder 6, the truncated cone squeezes the concrete, and the concrete will squeeze the force (such as Fig.37 The direction indicated by the arrow F in the figure is a schematic diagram of the direction of the force) is transmitted to the transition conical surface 611. The reaction force generated by the transition conical surface 611 has a radial component on the enlarged head 103, and the enlarged head 103 is pressed radially. Therefore, the transition conical surface 611 can make the cylinder 6 and the concrete inside bear a larger load, thereby improving the connection strength between the connecting steel bar 102 and the enlarged head 103 and the cylinder 6.

[0134] Compared with the existing grouting sleeve, this sleeve does not require a separate grouting operation. Instead, when pouring concrete, the concrete slurry enters the cylinder 6 to complete the connection of the connecting steel bar 102. The operation is more convenient and does not require special grouting materials, saving costs. In addition, since this solution relies on pressure transmission, compared with the grouting sleeve that relies on the bonding and bite between the grouting material and the steel bar, the connection is more reliable.

[0135] The shape of the constriction 61 can be circular, square, long strip, oval or other shapes, and the cross section of the enlarged head 103 is adapted to the shape of the constriction 61. In order to effectively transmit the pressure of the enlarged head 103 to the cylinder 6 through the concrete, the size of the constriction 61 can be 1-5 mm larger than the size of the enlarged head 103, preferably 2-3 mm.

[0136] like Fig.38 and Fig.39 As shown, the cylinder 6 has a split structure and can be split into two halves along the axial direction. The outer surfaces of the ends of the two halves of the cylinder 6 that are close to each other are fixedly connected with a connecting plate 63, and the connecting plates 63 are provided with connecting holes 631. After the two halves of the cylinder 6 are butted and assembled, the connecting holes 631 on the connecting plates 63 can be aligned with each other. The two connecting plates 63 can be pinned by inserting a pin or bolt into the two aligned connecting holes 631 at the same time, so as to limit the two halves of the cylinder 6 from separating from each other in the direction away from each other.

[0137] When the distance between the two prefabricated ground beams 8 is relatively small, the distance between the end faces of the connecting steel bars 102 embedded in the prefabricated ground beams 8 at one end close to each other is also relatively small. The cylinder 6 can be split into two halves. First, one half of the cylinder 6 is inserted into one of the connecting steel bars 102, and then the other half of the cylinder 6 is inserted into the connecting steel bar 102. Finally, the two halves of the cylinder 6 are slid along the axial direction of the connecting steel bar 102 and in the direction of approaching each other, so that the connecting holes 631 on the connecting plate 63 are aligned with each other, and the two halves of the cylinder 6 are spliced ​​together by inserting the latch into the connecting hole 631.

[0138] like Fig.40 As shown, when two vertical steel bars are connected, in order to more conveniently temporarily fix the sleeve 101 at the joint position of the two connecting steel bars 102 before pouring concrete, so as not to slip off. Therefore, a blocking element 64 is fixedly connected to the middle position of the inner wall of the cylinder 6 to prevent the enlarged head 103 from penetrating the sleeve 101. The blocking element 64 can be a disc plate located in the middle of the cylinder 6. Further, in order to allow the cement slurry to flow freely in the cylinder 6, the blocking element 64 is set in a hollow ring shape, and the inner diameter of the ring is smaller than the diameter of the enlarged head 103. Alternatively, the blocking element 64 can also be a rod member arranged along the radial direction of the cylinder 6.

[0139] Extending into the card-type sleeve:

[0140] like Fig.41 and Fig.42 As shown, the externally extending card-type sleeve includes a cylinder 6, a card block 65, and a spring piece 66. Both ends of the cylinder 6 are provided with card holes 651 for the card block 65 to be inserted, and a grouting hole 62 is provided on the cylinder 6. One end of the spring piece 66 is fixedly connected to the outer side surface of the cylinder 6, and the other end of the spring piece 66 is fixedly connected to one end of the card block 65 located outside the cylinder 6.

[0141] One end of the connecting steel bar 102 is fixedly connected with an enlarged head 103, the radial dimension of which is larger than that of the connecting steel bar 102, and the enlarged head 103 can be inserted into the cylinder 6 from the port of the cylinder 6. During the insertion process, the enlarged head 103 pushes the clamping block 65 to move in a direction away from the central axis of the cylinder 6, driving the spring sheet 66 to undergo elastic deformation. After the enlarged head 103 passes over the clamping block 65, the spring sheet 66 gradually recovers its deformation and is inserted into the cylinder 6 to reset, thereby limiting the enlarged head 103 from being pulled out of the cylinder 6.

[0142] When concrete is poured into the post-cast strip around the cylinder 6, cement slurry can flow into the cylinder 6 from the two ports of the cylinder 6 and the grouting holes 62. After the cement slurry solidifies, solid concrete is formed, which fixes the connecting steel bars 102 inside the cylinder 6, thereby realizing the connection of the two connecting steel bars 102.

[0143] In addition, it should be pointed out that the sleeve can adopt the four sleeve-related invention patents submitted by the applicant on April 8, 2018, with application numbers 201810306670.4, 201810307419.X, 201810307420.2 and 201810307967.2 respectively.

[0144] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A basic structure, characterized in that: A prefabricated foundation column is provided, 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 portion (21) and a support leg (22) perpendicular to the rod portion (21), the upper portion of the rod portion (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 basic structure according to claim 1, characterized in that: It also includes a prefabricated ground beam (8) arranged on the side of the column body (1), and the prefabricated ground beam (8) connects two adjacent prefabricated foundation columns.

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

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

5. The basic 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 basic structure according to claim 3, characterized in that: It also includes perforated bars (13) passing through the perforated holes, and the perforated bars (13) are fixedly connected to the ground beam connecting bars (81).

7. The basic structure according to claim 6, characterized in that: Both ends of the perforated reinforcement (13) are provided with enlarged heads (103), the ends of the ground beam connecting reinforcement (81) are enlarged heads (103), and the perforated reinforcement (13) and the ground beam connecting reinforcement (81) are connected by a sleeve (101).

8. The basic structure according to claim 3, characterized in that: It also includes a precast concrete column (9), the bottom surface of which is provided with a bottom connecting rib (91), the end of which 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 basic 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 bars (81) of two adjacent prefabricated ground beams (8) are connected inside the post-cast filling strip (14).

10. The basic structure according to claim 9, characterized in that Both ends of the ground beam connecting ribs (81) of the prefabricated ground beam (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 basic structure according to claim 3, characterized in that: The height of the prefabricated ground beam (8) is greater than the height of the column (1); the concrete at the bottom of the column (1) is poured in two portions, the first pouring area (52) being located at the bottom and the second pouring area (53) being 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 construction method for a foundation structure, characterized in that: The construction of the base 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: The method further comprises step d-1, connecting the ground beam connecting bars (81) of the prefabricated ground beams (8) to each other, and casting a post-cast strip between two adjacent prefabricated ground beams (8).

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