CN113513030B - Double-pile one-column joint construction method for solving height difference of reverse-construction floor - Google Patents
Double-pile one-column joint construction method for solving height difference of reverse-construction floor Download PDFInfo
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Abstract
The application relates to the technical field of constructional engineering, in particular to a double-pile one-column joint construction method for solving the height difference of a reverse-construction floor, which comprises the following steps of: s1, constructing the foundation pit enclosure wall and the lower parts of the two sides of the foundation pit reverse-construction steel pipe piles; s2, excavating the first-layer soil; s3, underpinning steel beams; s4, constructing the upper part to be used as a steel column; s5, constructing frame beams with different elevations on two sides of the upper part along the steel column; s6, pouring concrete into the frame beams with different elevations on two sides: form the lower beam slab of first floor frame roof beam, the higher beam slab of first floor frame roof beam respectively, form double pile one post connected node structure, when this application can be solved effectively and has great difference in height in the adjacent floor of basement first floor, the power problem of passing of steel column and the contrary steel core concrete pile of doing of lower part in the same direction as steel column and the lower part in the floor elevation place and the connection problem of steel column and big difference in height beam slab, the contrary steel core concrete pile of doing of lower part in the same direction as upper portion, ensure foundation ditch engineering's structure safety and construction quality's effect.
Description
Technical Field
The application relates to the technical field of constructional engineering, in particular to a double-pile one-column joint construction method for solving the height difference of a reverse-construction floor.
Background
The reverse construction method is a construction method combining a main structure and a supporting structure, namely combining a basement outer wall with an enclosure wall, combining a horizontal structural member with a horizontal supporting system, and combining a vertical structural member with a temporary upright column system. The reverse construction method has the advantages that the vertical synchronous construction can be realized to shorten the construction period of the main project, the support rigidity is high, the deformation of the foundation pit can be strictly controlled, the construction cost can be saved by using the main structure as a support, and the like, and the reverse construction method is widely applied to the foundation pit project.
During the foundation pit construction by the reverse construction method, the vertical supporting system adopts a form that the upper part forward-construction steel column is combined with the lower part reverse-construction concrete-filled steel tube pile. According to the construction process requirements of the foundation pit of the reverse construction method, the vertical supporting system needs to be constructed on the ground before the foundation pit is excavated.
In the foundation pit engineering of the reverse construction method, the condition that the elevation difference exists between the adjacent floor slabs of the first floor of the basement sometimes occurs. When the height difference of two adjacent floor boards is large, the force transmission problem of the steel pipe concrete piles which are sequentially made at the upper part and reversely made at the lower part at the elevation of the floor boards and the connection problem of the steel pipe concrete piles which are sequentially made at the upper part, the beam board with large height difference and reversely made at the lower part are inevitable, and the problems are also common problems in the construction process of adopting an up-and-down synchronous reverse method for the steel-concrete combined structure which is a steel structure on the ground and is a steel-concrete combined structure underground.
Disclosure of Invention
In order to effectively solve when there is great difference in height in the adjacent floor of the first floor of the basement, the upper portion is in the same direction as the power transmission problem of steel column and the contrary steel pipe concrete pile of doing in the lower part at the elevation of the floor and the connection problem of steel column and the great difference beam slab, the contrary steel pipe concrete pile of doing in the lower part are in the same direction as in the upper portion, ensure the structural safety and the construction quality of foundation ditch engineering, the application provides a solve the two-pile one-column node construction method of the contrary difference in height of doing the floor.
A double-pile one-column joint construction method for solving the height difference of a reverse-construction floor adopts the following technical scheme:
a double-pile one-column joint construction method for solving the height difference of a reverse-construction floor comprises the following steps:
s1, constructing the foundation pit enclosure wall and the lower parts of the two sides of the foundation pit reverse-construction steel pipe pile: when the foundation pit is constructed by adopting a reverse method, firstly, measuring and lofting are carried out, an underground enclosure wall is constructed on the ground, and then, steel pipe piles are driven into the ground from the lower parts of two sides to be reversely made to serve as vertical supporting structural members;
s2, digging out the first-layer soil body: mechanical equipment or manual work is used for excavating the first-layer soil body to form a first-layer foundation pit of the basement;
s3, underpinning steel beams: carrying out underpinning steel beam construction, wherein the underpinning steel beam is hollow and has a cylindrical structure, and is fixedly connected with the lower reverse-construction steel pipe piles on two sides below the underpinning steel beam;
s4, constructing an upper part to be used as a steel column: the underpinning steel beam is provided with a vertical through hole, so that the upper part sequential steel column penetrates through the underpinning steel beam and is fixedly connected with the underpinning steel beam, and the bottom of the upper part sequential steel column has a distance from the elevation of the first floor of the basement;
s5, constructing the frame beams with different elevations on the two sides of the steel column at the upper part along the steel column: hoisting frame beams with different elevations on the upper parts along the two sides of the steel column, and fixedly connecting the frame beams with the corresponding connecting positions of the underpinned steel beams;
s6, pouring concrete into the frame beams with different elevations on two sides: and respectively forming a lower beam plate of the first-layer frame beam and a higher beam plate of the first-layer frame beam to form a double-pile one-column connecting node structure.
By adopting the technical scheme, the lower parts of the two sides are reversely made into the steel pipe piles, the underpinned steel beams and the upper part are sequentially made into the steel column to jointly form the double-pile one-column connection node structure, the double-pile one-column connection node structure can stably connect and support the lower beam slab of the first-layer frame beam and the higher beam slab of the first-layer frame beam of the upper part at different elevations in the two sides of the upper part sequentially made steel column, effectively solve the force transmission problem of the upper part sequentially made steel column and the lower part reversely made steel pipe concrete piles at the elevation of the floor when the adjacent floor slab of the first layer of the basement has larger height difference, and the connection problem of the upper part sequentially made steel column, the lower beam slab of the first-layer frame beam, the higher beam slab of the first-layer frame beam and the lower part reversely made steel pipe concrete piles, thereby ensuring the structural safety and the construction quality of foundation pit engineering.
Optionally, in step S1, concrete is poured into the lower inverted steel pipe pile to form a lower inverted steel pipe concrete pile.
By adopting the technical scheme, the lower reverse-construction steel pipe concrete pile is formed by pouring concrete into the lower reverse-construction steel pipe pile and is used for increasing the strength of the lower reverse-construction steel pipe pile, so that the formed lower reverse-construction steel pipe concrete pile has stronger structural strength and supporting strength, the supporting stability of underpinning steel beams, lower beam slabs of first-layer frame beams and higher beam slabs of first-layer frame beams is improved, and the structural safety and the construction quality of foundation pit engineering are ensured.
Optionally, two mutually-deviated clamping interfaces are formed in the circumferential side wall, located inside the underpinning steel beam, of the upper portion sequential steel column, a clamping assembly is jointly arranged in the two clamping interfaces and comprises two clamping seats and a plurality of clamp springs, the two clamping seats are respectively in sliding fit with the two clamping interfaces, the clamping seats are in clamping fit with the inner wall of the underpinning steel beam, and all the clamp springs are located between the two clamping seats so that the clamping seats and the underpinning steel beam can be kept in clamping fit; in step S4, before constructing the upper portion sequential steel column, the two clamping seats are pushed into the upper portion sequential steel column in advance, then the upper portion sequential steel column and the underpinning steel beam are installed, when the upper portion sequential steel column is put down in place, the clamp spring restores to a natural state to spring the end portions of the two clamping seats away from each other into the underpinning steel beam, the upper portion sequential steel column and the underpinning steel beam are clamped and fixed, and then the upper portion sequential steel column and the underpinning steel beam are welded and fixed in a welding mode.
Through adopting above-mentioned technical scheme, when the upper portion was transferred in the same direction as the steel column and is installed when targetting in place, the jump ring was automatic with the tip of two cassette mutual deviations in the underpinning girder steel, with the upper portion in the same direction as the steel column and underpin the girder steel carry out the chucking fixed. And then, the upper part is sequentially made into a steel column and welded and fixed with the support pipe steel beam, when the upper part is welded into the steel column, the upper part is sequentially made into the steel column without being supported by an external supporting structure, and more construction space in the foundation pit can be released. The clamping assembly is matched with a welding and fixing mode, so that the connection strength and the connection stability of the upper portion sequential steel column and the underpinning steel beam are improved, and the construction quality of the whole foundation pit structure is improved.
Optionally, the side surface of the clamping seat, which is abutted against the inner wall of the underpinning steel beam, is obliquely arranged, and the end part of the clamping seat, which is far away from the clamp spring, is in a contracted shape; in step S4, before the upper portion is lowered to make the steel column, the clamping seat does not need to be pushed into the upper portion steel column completely, so that the inclined surface of the end of the clamping seat abuts against the edge of the opening at the top of the underpinning steel beam.
Through adopting above-mentioned technical scheme, put the in-process of upper portion in the same direction as making the steel column under, the inclined plane of underpinning girder steel open-top edge butt cassette makes the cassette automatic slide completely in upper portion in the same direction as making the steel column for the installation process of transferring of steel column is in the same direction as being made in upper portion, reduction of construction period.
Optionally, stressed steel bars are fixedly arranged at the joints of the frame beams with different elevations on the two sides of the upper portion along the steel column and the underpinning steel beam, and one ends of the stressed steel bars and the frame beams are integrally formed; in step S5, after the frame beam is lowered in place, the stressed steel bars of the frame beam are fixedly connected to the corresponding side faces of the underpinned steel beams; and fixedly connecting the side wall of the frame beam with higher elevation with the side wall of the upper part along the steel column.
By adopting the technical scheme, the stressed steel bars can firmly and fixedly connect the frame beam and the underpinning steel beam, and can also generate a gap between the frame beam and the underpinning steel beam so as to provide a space for spraying concrete on the outer surface of the underpinning steel beam in future.
Optionally, in step S6, after the concrete is poured into the frame beam, the concrete is poured into the upper sequential steel column, and the pouring top elevation is the elevation of the higher beam surface of the first-layer frame beam.
By adopting the technical scheme, in the vertical direction, because the lower beam slab of the first-layer frame beam, the higher beam slab of the first-layer frame beam and the upper portion are not at the same height, the upper portion is easy to receive the static shearing force from the lower beam slab of the first-layer frame beam and the higher beam slab of the first-layer frame beam along with the steel column, the concrete is locally filled in the upper portion along with the steel column, the filling top elevation is the higher beam surface elevation of the first-layer frame beam, the structural strength of the connecting section of the upper portion along with the steel column, the lower beam slab of the first-layer frame beam and the higher beam slab of the first-layer frame beam can be reinforced, the anti-shearing performance of the upper portion along with the steel column is improved, the supporting stability of the upper portion along with the steel column to the ground building is ensured, and the structural safety and the construction quality of the foundation pit engineering and the ground building are ensured.
Optionally, in step S6, after the concrete is poured into the upper forward steel column, concrete is poured into the underpinning steel beam, and then concrete is sprayed to the outside of the underpinning steel beam to form an outer concrete layer.
By adopting the technical scheme, the outer concrete layer can meet the rust-proof requirement of the underpinned steel beam, and the connection strength of the underpinned steel beam and the first-layer frame beam lower beam slab and the first-layer frame beam higher beam slab can be increased.
Optionally, in step S6, after the entire construction of the basement structure is completed, the temporary lower reverse-construction steel pipe concrete piles at both sides are cut and removed, and a single steel pipe concrete pile below the upper forward-construction steel column is constructed to form a permanent one-column one-pile node structure.
Through adopting above-mentioned technical scheme, demolish behind the lower part contrary steel pipe concrete pile of doing of both sides, can increase the usage space of basement, permanent one post one pile node structure can reduce the volume that vertical support component system took to the basement space than double-pile one post connected node structure.
Optionally, the top section of the single steel pipe concrete pile is in an inverted quadrangular frustum pyramid shape; in step S6, the end of the single steel tube concrete pile with the larger area of the top end face is fixedly connected to the upper portion of the steel column.
Through adopting above-mentioned technical scheme, can further reduce the circumference size of single steel pipe concrete pile to further reduce the occupation to basement space, in order to obtain more basement spaces that can normally use.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the lower reverse-construction steel pipe piles, the underpinned steel beams and the upper forward-construction steel columns on two sides form a double-pile one-column connection node structure together, the double-pile one-column connection node structure can stably connect and support a lower beam slab of a first-layer frame beam and a higher beam slab of the first-layer frame beam with different elevations on two sides of the upper forward-construction steel column, and effectively solve the force transmission problem of the upper forward-construction steel column and the lower reverse-construction steel pipe concrete pile at the elevation mark position of a floor when a large height difference exists between adjacent floor slabs on the first layer of a basement, and the connection problem of the upper forward-construction steel column and the lower beam slab of the first-layer frame beam, the higher beam slab of the first-layer frame beam and the lower reverse-construction steel pipe concrete pile, so that the structural safety and the construction quality of foundation pit engineering are ensured;
2. the clamping assembly automatically clamps and fixes the upper sequential steel column and the underpinning steel beam, and when the upper sequential steel column is welded, an external supporting structure is not needed to support the upper sequential steel column, so that more construction space in the foundation pit can be released;
3. compared with a double-pile connecting node structure, the permanent one-pile node structure can increase the use space of a basement and reduce the occupied volume of a vertical supporting member system to the space of the basement.
Drawings
Fig. 1 is a schematic structural diagram illustrating a structure of a double-pile one-column connecting joint according to an embodiment of the present application;
FIG. 2 is a cross-sectional view embodying a circlip;
fig. 3 is a schematic structural view showing a permanent one-column-one-pile node structure.
Description of the reference numerals: 1. the lower part is reversely made into a steel pipe concrete pile; 2. underpinning the steel beam; 3. the upper part is sequentially made into a steel column; 31. a card interface; 4. wrapping a concrete layer; 5. the lower beam plate of the first layer of frame beam; 6. the first layer of frame beam is higher than the beam slab; 7. a single steel pipe concrete pile; 8. a clamping assembly; 81. a card holder; 82. a clamp spring; 9. and (5) stressed reinforcing steel bars.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a double-pile one-column joint construction method for solving the height difference of a reverse-construction floor, which comprises the following steps of:
s1, referring to FIG. 1, when the foundation pit is constructed by a reverse method, firstly, measuring and lofting are carried out, an underground enclosure wall is constructed on the ground, and then, steel pipe piles are driven into the ground at the lower parts of two sides to be used as vertical supporting structural members; and after the lower reverse-construction steel pipe pile is constructed in place, pouring concrete into the lower reverse-construction steel pipe pile to form a lower reverse-construction steel pipe concrete pile 1.
S2, referring to fig. 1, mechanical equipment or manual work is used for excavating the first layer soil body to form the first layer foundation pit of the basement.
And S3, referring to the figures 1 and 2, hoisting the underpinning steel beam 2, constructing the underpinning steel beam 2, wherein the underpinning steel beam 2 is hollow and has a cylindrical structure, hoisting the underpinning steel beam 2 to the lower parts of the two sides to be the top end of the concrete-filled steel tubular pile 1, and welding and fixing the bottom surface of the underpinning steel beam 2 and the lower parts of the two sides to be the concrete-filled steel tubular pile 1.
S4, referring to fig. 1 and 2, the underpinning steel beam 2 has a plurality of vertical through holes uniformly distributed, the upper portion is made to pass through the through holes of the underpinning steel beam 2 along with the steel column 3, and when the upper portion is installed in place along with the steel column 3, the bottom of the upper portion along with the steel column 3 has a distance from the elevation of the first floor of the basement.
Referring to fig. 1 and 2, two joint interfaces 31 that deviate from each other are seted up to the circumference lateral wall that upper portion is located the inside underpinning girder steel 2 along making steel column 3, are equipped with joint subassembly 8 jointly in two joint interfaces 31. The clamping component 8 comprises two clamping seats 81 and a plurality of clamp springs 82, the two clamping seats 81 are respectively in sliding fit with the two clamping interfaces 31, the end portions of the two clamping seats 81, which deviate from each other, are in clamping fit with the inner wall of the underpinning steel beam 2, and the clamping seats 81 are obliquely arranged on the side faces of the inner wall of the underpinning steel beam 2 and enable the end portions of the clamping seats 81 to be in a shrinkage shape. All the clamp springs 82 are located between the two clamping seats 81, two ends of each clamp spring 82 are fixedly connected with the two clamping seats 81 respectively, and when the clamp springs 82 are in a natural state, the clamping seats 81 and the underpinning steel beam 2 are in clamping fit.
Referring to fig. 1 and 2, when the upper portion sequential steel column 3 is lowered, the inclined plane at the end of the clamping seat 81 abuts against the edge of the opening at the top of the underpinning steel beam 2, and in the process of lowering the upper portion sequential steel column 3, the edge of the opening at the top of the underpinning steel beam 2 abuts against the inclined plane of the clamping seat 81, so that the clamping seat 81 automatically and completely slides into the upper portion sequential steel column 3, the installation speed of the upper portion sequential steel column 3 is increased, and the construction period is shortened; when the upper portion is in the same direction as the steel column 3 and is put down to the right place, the clamp spring 82 restores the natural state to enable the end portions of the two clamping seats 81, which are deviated from each other, to be sprung into the underpinning steel beam 2, the upper portion is in the same direction as the steel column 3 and is clamped and fixed with the underpinning steel beam 2, and then the upper portion is in the same direction as the joint of the steel column 3 and the underpinning steel beam 2 to be welded and fixed in a welding mode.
S5, referring to fig. 1 and 2, the frame beams with different elevations on both sides of the upper portion of the steel column 3 are hoisted, a plurality of evenly distributed stress steel bars 9 are integrally formed at the joints between the frame beams with different elevations on both sides of the upper portion of the steel column 3 and the underpinning steel beam 2, after the frame beams are lowered in place, the stress steel bars 9 of the frame beams and the corresponding side surfaces of the underpinning steel beam 2 are welded and fixed, and the side walls of the frame beams with higher elevations and the side walls of the upper portion of the steel column 3 are welded and fixed. The stressed steel bars 9 can firmly and fixedly connect the frame beam and the underpinning steel beam 2, and can also generate a gap between the frame beam and the underpinning steel beam 2 so as to provide a space for spraying concrete on the outer surface of the underpinning steel beam 2 in the future.
S6, referring to fig. 1 and 2, pouring concrete into the frame beams with different elevations on both sides to form a lower beam slab 5 of the first-layer frame beam and a higher beam slab 6 of the first-layer frame beam, respectively, and then pouring concrete into the upper forward steel column 3, where the top elevation of the pouring is the elevation of the higher beam surface of the first-layer frame beam. And then concrete is poured into the underpinning steel beam 2, and finally concrete is sprayed outside the underpinning steel beam 2 to form an outer concrete coating layer 4, so that a double-pile one-column connecting node structure is formed.
Referring to fig. 1 and 2, the outer concrete layer 4 can meet the rust-proof requirement of the underpinned steel beam 2, and can increase the connection strength of the underpinned steel beam 2 and the first-layer frame beam lower beam slab 5 and the first-layer frame beam higher beam slab 6. In the vertical direction, because the lower beam slab 5 of the first-layer frame beam, the higher beam slab 6 of the first-layer frame beam and the upper portion are not at the same height, the upper portion is easy to receive the static shear force from the lower beam slab 5 of the first-layer frame beam and the higher beam slab 6 of the first-layer frame beam along with the steel column 3, the concrete is locally filled in the upper portion along with the steel column 3, and the filling top elevation is the higher beam surface elevation of the first-layer frame beam, the structural strength of the connecting section of the upper portion along with the steel column 3, the lower beam slab 5 of the first-layer frame beam and the higher beam slab 6 of the first-layer frame beam can be reinforced, the anti-shearing performance of the upper portion along with the steel column 3 is improved, the supporting stability of the upper portion along with the steel column 3 to the ground building is ensured, and the structural safety and the construction quality of the foundation pit engineering and the ground building are ensured.
Referring to fig. 1 and 3, after the whole construction of the basement structure is completed, the temporary lower reverse-construction steel pipe concrete piles 1 on the two sides are cut and removed, and the single steel pipe concrete pile 7 below the upper forward-construction steel column 3 is constructed to form a permanent one-column one-pile node structure. After the lower parts of the two sides of the reverse-construction steel pipe concrete pile 1 are dismantled, the using space of the basement can be increased, and compared with a double-pile connecting node structure, the permanent one-pile node structure can reduce the occupied volume of a vertical supporting member system on the space of the basement.
Referring to fig. 3, the top section of the single steel pipe concrete pile 7 is in an inverted square frustum shape, and the end with the larger area of the top end face of the single steel pipe concrete pile 7 is connected with the upper sequential steel column 3 in a pouring and molding manner. The circumferential size of the single steel pipe concrete pile 7 can be further reduced, so that the occupation of the basement space is further reduced, and more basement spaces capable of being used normally are obtained.
The implementation principle of the double-pile one-column joint construction method for solving the height difference of the reverse-construction floor slab in the embodiment of the application is as follows: firstly, measuring and lofting, constructing an underground enclosure wall on the ground, and then driving lower parts of two sides of the underground enclosure wall to serve as vertical supporting structural members; and after the lower reverse-construction steel pipe pile is constructed in place, pouring concrete into the lower reverse-construction steel pipe pile to form a lower reverse-construction steel pipe concrete pile 1. And (4) excavating the first-layer soil body by using mechanical equipment or manpower to form a first-layer foundation pit of the basement.
And hoisting the underpinned steel beam 2, underpinning the steel beam 2, hoisting the underpinned steel beam 2 to the top ends of the lower reverse steel pipe concrete piles 1 on two sides, and welding and fixing the bottom surface of the underpinned steel beam 2 and the lower reverse steel pipe concrete piles 1 on two sides.
When the upper-portion sequential-construction steel column 3 is placed downwards, the inclined plane at the end part of the clamping seat 81 is abutted to the edge of the opening at the top of the supporting and replacing steel beam 2, and in the process of placing the upper-portion sequential-construction steel column 3 downwards, the edge of the opening at the top of the supporting and replacing steel beam 2 is abutted to the inclined plane of the clamping seat 81, so that the clamping seat 81 automatically and completely slides into the upper-portion sequential-construction steel column 3, the installation speed of the upper-portion sequential-construction steel column 3 is increased, and the construction period is shortened; when the upper portion is in the same direction as the steel column 3 and is transferred to the place, the end portions, deviating from each other, of the two clamping seats 81 are sprung into the underpinning steel beam 2 by the clamp springs 82 in a natural state, the upper portion is clamped and fixed with the underpinning steel beam 2 in the same direction as the steel column 3, and then the upper portion is welded and fixed in the same direction as the joint of the steel column 3 and the underpinning steel beam 2 in a welding mode. When the upper portion is installed in place along the steel column 3, the bottom of the upper portion along the steel column 3 is spaced from the elevation of the first floor of the basement.
And hoisting the frame beams with different elevations at the two sides of the upper consequent steel column 3, lowering the frame beams in place, welding and fixing the stress steel bars 9 of the frame beams and the corresponding side surfaces of the underpinned steel beams 2, and welding and fixing the side walls of the frame beams with higher elevations and the side walls of the upper consequent steel column 3.
Concrete is poured into the frame beams with different elevations on the two sides to form a lower beam plate 5 of the first-layer frame beam and a higher beam plate 6 of the first-layer frame beam respectively, then concrete is poured into the steel column 3 sequentially from the upper part, and the top elevation of pouring is the elevation of the higher beam surface of the first-layer frame beam. And then pouring concrete into the underpinned steel beam 2, and finally spraying concrete outside the underpinned steel beam 2 to form an outer concrete-coated layer 4, so as to form a double-pile one-column connecting node structure.
After the whole construction of the basement structure is completed, the temporary lower reverse-acting concrete filled steel tubular piles 1 on the two sides are cut and removed, the construction of the single concrete filled steel tubular pile 7 below the upper forward-acting steel column 3 is carried out, the end face with the larger area at the top end face of the single concrete filled steel tubular pile 7 is poured, formed and connected with the upper forward-acting steel column 3, and the permanent one-column one-pile node structure is formed.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A double-pile one-column joint construction method for solving the height difference of a reverse-construction floor is characterized by comprising the following steps:
s1, constructing the foundation pit enclosure wall and the lower parts of the two sides of the foundation pit reverse-construction steel pipe pile: when the foundation pit is constructed by adopting a reverse construction method, firstly, measuring and lofting are carried out, an underground enclosure wall is constructed on the ground, and then, steel pipe piles are driven into the ground at the lower parts of two sides to be reversely constructed to serve as vertical supporting structural members;
s2, excavating the first-layer soil body: mechanical equipment or manual work is used for excavating the first-layer soil body to form a first-layer foundation pit of the basement;
s3, underpinning the steel beam (2) construction: constructing a underpinning steel beam (2), wherein the underpinning steel beam (2) is hollow and has a cylindrical structure and is fixedly connected with the reverse steel pipe piles at the lower parts of two sides below;
s4, constructing an upper part to be used as a steel column (3): the underpinning steel beam (2) is provided with a vertical through hole, so that the upper part sequential steel column (3) penetrates through the underpinning steel beam (2) and is fixedly connected with the underpinning steel beam (2), and the bottom of the upper part sequential steel column (3) has a distance from the elevation of the first floor of the basement;
s5, constructing the frame beams with different elevations on the two sides of the upper part along the steel column (3): hoisting frame beams with different elevations on the two sides of the upper part along the steel column (3), and fixedly connecting the frame beams with the corresponding connecting positions of the underpinned steel beams (2);
s6, pouring concrete into the frame beams with different elevations on two sides: form the lower beam slab of first floor frame roof beam (5), the higher beam slab of first floor frame roof beam (6) respectively, form a double pile one post connected node structure.
2. The double-pile one-column joint construction method for solving the height difference of the reverse-construction floor as claimed in claim 1, wherein: in step S1, concrete is poured into the lower inverted steel-pipe pile to form a lower inverted steel-pipe concrete pile (1).
3. The double-pile one-column joint construction method for solving the height difference of the reverse-construction floor as claimed in claim 1, wherein: the circumferential side wall, located inside the underpinning steel beam (2), of the upper portion sequential steel column (3) is provided with two mutually-deviated clamping interfaces (31), clamping assemblies (8) are jointly arranged in the two clamping interfaces (31), each clamping assembly (8) comprises two clamping seats (81) and a plurality of clamp springs (82), the two clamping seats (81) are respectively in sliding fit with the two clamping interfaces (31), the clamping seats (81) are in clamping fit with the inner wall of the underpinning steel beam (2), and all the clamp springs (82) are located between the two clamping seats (81) so that the clamping seats (81) can be kept in clamping fit with the underpinning steel beam (2); in step S4, before constructing the upper cis-acting steel column (3), the two clamping seats (81) are pushed into the upper cis-acting steel column (3) in advance, and then the upper cis-acting steel column (3) and the underpinning steel beam (2) are installed, when the upper cis-acting steel column (3) is put down to the place, the clamp spring (82) restores to the natural state to spring the end portions of the two clamping seats (81) which deviate from each other into the underpinning steel beam (2), the upper cis-acting steel column (3) and the underpinning steel beam (2) are clamped and fixed, and then the upper cis-acting steel column (3) and the underpinning steel beam (2) are welded and fixed in a welding mode.
4. The method for constructing the double-pile one-column joint for solving the height difference of the reverse-construction floor slab as claimed in claim 3, wherein: the clamping seat (81) is obliquely arranged on the side surface abutted to the inner wall of the underpinning steel beam (2), and the end part of the clamping seat (81) far away from the clamp spring (82) is in a contraction shape; in step S4, before the steel column (3) is made in the order of the upper portion, the clamping seat (81) does not need to be pushed completely into the steel column (3) in the order of the upper portion, so that the inclined surface of the end portion of the clamping seat (81) abuts against the edge of the opening at the top of the underpinning steel beam (2), and in the process of making the steel column (3) in the order of the lower portion, the edge of the opening at the top of the underpinning steel beam (2) abuts against the inclined surface of the clamping seat (81) so that the clamping seat (81) automatically and completely slides into the steel column (3) in the order of the upper portion.
5. The double-pile one-column joint construction method for solving the height difference of the reverse-construction floor as claimed in claim 1, wherein: stress reinforcing steel bars (9) are fixedly arranged at the joints of the frame beams with different elevations on the two sides of the upper sequential steel column (3) and the underpinned steel beams (2), and one ends of the stress reinforcing steel bars (9) are integrally formed with the frame beams; in step S5, after the frame beam is lowered to the proper position, the stress steel bar (9) of the frame beam is fixedly connected with the corresponding side surface of the underpinning steel beam (2); and fixedly connecting the side wall of the frame beam with higher elevation with the side wall of the upper part along the steel column (3).
6. The double-pile one-column joint construction method for solving the height difference of the reverse-construction floor as claimed in claim 1, wherein: in step S6, after the concrete is poured into the frame beam, the concrete is poured into the upper sequential steel column (3), and the top elevation of the pouring is the elevation of the higher beam surface of the first-layer frame beam.
7. The method for constructing the double-pile one-column joint for solving the height difference of the reverse-construction floor slab as claimed in claim 6, wherein: in step S6, after the concrete is poured into the upper forward steel column (3), concrete is poured into the underpinning steel beam (2), and concrete is sprayed to the outside of the underpinning steel beam (2) to form an outer concrete layer (4).
8. The method for constructing the double-pile one-column joint for solving the height difference of the reverse floor as claimed in claim 2, wherein: in step S6, after the entire construction of the basement structure is completed, the temporary lower reverse-acting reinforced concrete piles (1) at both sides are cut and removed, and a single reinforced concrete pile (7) below the upper forward-acting steel column (3) is constructed to form a permanent one-column one-pile node structure.
9. The method for constructing the double-pile one-column joint for solving the height difference of the reverse-construction floor as claimed in claim 8, wherein: the top section of the single steel pipe concrete pile (7) is in an inverted quadrangular frustum pyramid shape; in step S6, the end of the single steel pipe concrete pile (7) with the larger area of the top end face is fixedly connected with the upper portion sequential steel column (3).
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| CN205116419U (en) * | 2015-08-03 | 2016-03-30 | 青岛建安建设集团有限公司 | Wrong elevation pile cap |
| CN206016058U (en) * | 2016-09-12 | 2017-03-15 | 广东省城乡规划设计研究院 | A kind of shaped steel or normal concrete beams exist the discrepancy in elevation larger when continuous beam |
| CN211773695U (en) * | 2019-12-11 | 2020-10-27 | 舜杰建设（集团）有限公司 | New and old structure multilayer basement trades and props biography power structure |
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| CN211057811U (en) * | 2019-12-24 | 2020-07-21 | 陕西建工基础建设集团有限公司 | Foundation ditch assembled inner support component and hat roof beam connection structure |
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