CN112127369A - Fabricated foundation pit steel supporting structure and construction method thereof - Google Patents
Fabricated foundation pit steel supporting structure and construction method thereof Download PDFInfo
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- CN112127369A CN112127369A CN202010897155.5A CN202010897155A CN112127369A CN 112127369 A CN112127369 A CN 112127369A CN 202010897155 A CN202010897155 A CN 202010897155A CN 112127369 A CN112127369 A CN 112127369A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 254
- 239000010959 steel Substances 0.000 title claims abstract description 254
- 238000010276 construction Methods 0.000 title claims abstract description 76
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 15
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention belongs to the technical field of underground engineering, and particularly relates to an assembled foundation pit steel supporting structure and a construction method thereof, wherein the assembled foundation pit steel supporting structure comprises a crown beam, a prefabricated steel support, a temporary positioner and a vertical construction error regulator for regulating the vertical construction error of the prefabricated steel support; the prefabricated steel support is formed by sequentially splicing two end sections and a plurality of middle sections arranged between the two end sections through connecting joints; the end part of the end section is poured with end concrete, the end part of the end section and the end concrete partially extend into the crown beam, and the end concrete and the crown beam are integrally poured and formed; one end of the vertical construction error regulator is connected with the enclosure structure, and the other end of the vertical construction error regulator is connected with the end head section through the temporary positioner. The invention not only can realize rigid connection between the prefabricated steel support sections and between the prefabricated steel support and the crown beam to ensure the integrity and the safety of the foundation pit, but also can accurately adjust the vertical construction error through the vertical construction error adjuster to realize accurate construction.
Description
Technical Field
The invention belongs to the technical field of underground engineering, and particularly relates to an assembled foundation pit steel supporting structure and a construction method thereof.
Background
At present, in a domestic deep foundation pit inner support system, cast-in-place concrete supports are mostly adopted for the first support, so that the stability of the whole foundation pit is improved, and the tension which possibly appears in the first support can be responded. If the first support is a steel support, the steel support cannot be rigidly connected with the crown beam, and cannot bear pulling force, local failure and overall situation. Although the first concrete support is safe, the first concrete support also becomes a pain point of a construction unit, and the later chiseling of the concrete support wastes time and labor, and does not accord with the green and environment-friendly concept of modern buildings.
In order to solve the problems, many types of prefabricated supports are researched and developed, but the prefabricated supports do not reach the depth capable of being constructed effectively, some prefabricated supports cannot reach the same effect as a concrete support, and the integrity and the stability of a building enclosure structure of a foundation pit cannot be guaranteed, so that a novel assembly type foundation pit steel support structure capable of being implemented and a construction method thereof need to be researched and developed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an assembly type foundation pit steel supporting structure and a construction method thereof, which can ensure the integrity and safety of a foundation pit and can realize accurate construction.
In order to achieve the purpose, the technical scheme of the invention is that the assembled foundation pit steel supporting structure comprises a crown beam, a prefabricated steel support, a temporary positioner and a vertical construction error regulator for regulating the vertical construction error of the prefabricated steel support; the prefabricated steel support is formed by sequentially splicing two end sections and a plurality of middle sections arranged between the two end sections through connecting joints; the end part of the end section is cast with end concrete, the end part of the end section and the end concrete partially extend into the crown beam, and the end concrete and the crown beam are integrally cast; one end of the vertical construction error regulator is connected with the enclosure structure, and the other end of the vertical construction error regulator is connected with the end head section through the temporary positioner.
Furthermore, the vertical construction error regulator comprises a positioning I-shaped steel, a positioning I-shaped steel connecting plate, a T-shaped connecting plate and two push-pull mechanisms arranged on two sides of the prefabricated steel support; one end of each push-pull mechanism is connected with the enclosure structure, and the other end of each push-pull mechanism is connected with a parallel plate of a T-shaped connecting plate; the upper flange plate of the positioning I-shaped steel is fixed with the bottom of the end section through the temporary positioner, and the positions, which are positioned on two sides of the prefabricated steel support, on the lower flange plate of the positioning I-shaped steel are respectively connected with a positioning I-shaped steel connecting plate; and the vertical plate of the T-shaped connecting plate and the positioning I-shaped steel connecting plate are both provided with long round holes, and the T-shaped connecting plate and the positioning I-shaped steel connecting plate are fixed by high-strength friction bolts penetrating through the vertical plate of the T-shaped connecting plate and the long round holes on the positioning I-shaped steel connecting plate.
Furthermore, the push-pull mechanism comprises a length-adjustable pressure rod and a length-adjustable pull rod; one end of the length-adjustable pull rod and one end of the length-adjustable pressure rod are respectively connected with the enclosure structure through hinged supports, the other end of the length-adjustable pull rod is connected with the length-adjustable pressure rod, and the other end of the length-adjustable pressure rod is connected with the parallel plates of the T-shaped connecting plate.
Furthermore, the temporary positioner comprises a pressure plate, a temporary positioning bolt, an adjusting nut and a balance cushion block; one end of the pressure plate presses the bottom of the end section onto the upper flange plate of the positioning I-shaped steel, and the other end of the pressure plate presses the upper flange plate of the positioning I-shaped steel through the balance cushion block; the temporary positioning bolt penetrates through the pressing plate and the upper flange plate of the positioning I-shaped steel and is fixed through an adjusting nut.
Furthermore, the hinged support comprises a fixed steel plate and an ear plate, the ear plate is fixed on the fixed steel plate, and the fixed steel plate is connected with the enclosure structure through an expansion bolt; one end of the length-adjustable pull rod or one end of the length-adjustable pressure rod is hinged with the ear plate.
Furthermore, the head section and the middle section are both of a double H-shaped steel structure and are formed by welding two pieces of H-shaped steel side by side along the length direction of the H-shaped steel structure.
Furthermore, the connecting joint comprises a flange outer connecting steel plate, a flange inner connecting steel plate and a web connecting steel plate; the outer side and the inner side of the H-shaped steel flange plate at the joint of the two sections are respectively provided with the flange outer connecting steel plate and the flange inner connecting steel plate, and the flange outer connecting steel plate, the flange inner connecting steel plate and the H-shaped steel flange plates of the two sections are connected through high-strength bolts; two sides of the H-shaped steel web at the joint of the two sections are both provided with web connecting steel plates, and the web connecting steel plates at the two sides are connected with the H-shaped steel webs of the two sections through high-strength bolts.
The invention also provides a construction method of the fabricated foundation pit steel support structure, which comprises the following steps:
s1, manufacturing an end section and a middle section of the prefabricated steel support in a factory, and transporting the end section and the middle section to a construction site;
s2, sequentially assembling and forming a plurality of middle sections through connecting joints according to the width of the foundation pit;
s3, installing a vertical construction error regulator, and connecting one end of the vertical construction error regulator with the enclosure structure;
s4, splicing the end sections of the middle sections at the two ends through connecting joints to form a prefabricated steel support;
s5, before the construction of the crown beam, hoisting the prefabricated steel support by using a gantry crane to be placed at an appointed position, enabling two end sections of the prefabricated steel support to be respectively supported on the enclosure structures at two sides, simultaneously enabling the end section of the prefabricated steel support to be also supported at the other end of the vertical construction error regulator, and regulating the vertical construction error of the prefabricated steel support through the vertical construction error regulator; after the error adjustment is finished, connecting the other end of the vertical construction error adjuster with the end head section through a temporary positioner;
and S6, integrally casting and molding the head concrete at the end of the head section and the crown beam.
Further, the specific method for installing the vertical construction error regulator in the step S3 is as follows:
an expansion bolt is driven into the enclosure structure, the fixing steel plate is fixed on the enclosure structure through the expansion bolt, and an ear plate is welded on the fixing steel plate;
one end of the length-adjustable pressure rod and one end of the length-adjustable pull rod are respectively hinged with the corresponding ear plates, the other end of the length-adjustable pull rod is connected with the length-adjustable pressure rod, and the other end of the length-adjustable pressure rod is connected with a horizontal plate of a T-shaped connecting plate;
and welding a positioning I-shaped steel connecting plate on the positioning I-shaped steel, and fixing the positioning I-shaped steel connecting plate and the T-shaped steel through a high-strength friction bolt which penetrates through a vertical plate of the T-shaped connecting plate and a long circular hole on the positioning I-shaped steel connecting plate.
Furthermore, in step S5, the prefabricated steel support vertical construction error is adjusted through the length-adjustable pressing rod and the length-adjustable pulling rod, after the error adjustment is completed, the bottom of the end section is pressed on the upper flange plate of the positioning i-shaped steel through one end of the pressing plate of the temporary positioner, and the other end of the pressing plate is pressed on the upper flange plate of the positioning i-shaped steel through the balance cushion block; then, a temporary positioning bolt penetrates through the pressing plate and the upper flange plate of the positioning I-shaped steel and is fixed through an adjusting nut.
Compared with the prior art, the invention has the following beneficial effects:
(1) the sections of the prefabricated steel support and the end sections of the prefabricated steel support are rigidly connected, and the end sections of the prefabricated steel support and the top beam are rigidly connected, so that the integrity and the safety of the foundation pit are ensured;
(2) according to the invention, the vertical construction error is accurately adjusted through the vertical construction error adjuster, and the prefabricated steel support is positioned through the temporary positioner, so that the construction is accurate and convenient;
(3) the prefabricated steel support sections and the temporary positioner and the vertical construction error regulator are connected through bolts, so that the prefabricated steel support is convenient to install and disassemble and is convenient to recycle;
(4) the prefabricated steel support has the advantages that the rigidity is guaranteed, the double H-shaped steel and batten plate form is adopted, the support section can bear larger axial force, and the stability is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a construction process diagram of an assembled foundation pit steel support structure provided by an embodiment of the invention;
FIG. 2 is a top view of an assembled foundation pit steel support structure provided by an embodiment of the invention;
FIG. 3 is a side view of an assembled foundation pit steel support structure provided by an embodiment of the invention;
FIG. 4 is a cross-sectional view of a double H-beam structure of an intermediate section and a stub section according to an embodiment of the present invention;
FIG. 5 is a top view of a connection node on a prefabricated steel support provided by an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a connection node on a prefabricated steel support provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic structural view of an extra-flange connecting steel plate of the connecting joint according to the embodiment of the present invention;
FIG. 8 is a schematic structural view of a web-connecting steel plate of a joint according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of an inner flange connecting steel plate of the connecting joint according to the embodiment of the present invention;
FIG. 10 is a side view of a vertical construction error regulator provided by an embodiment of the present invention;
FIG. 11 is a top view of a tagging segment provided in accordance with an embodiment of the present invention;
FIG. 12 is a top view of a positioning I-beam provided in accordance with an embodiment of the present invention;
FIG. 13 is a schematic structural view of a hinged support provided in accordance with an embodiment of the present invention;
FIG. 14 is a side view of an articulating mount provided by an embodiment of the invention;
FIG. 15 is a view from a-a of FIG. 10
FIG. 16 is a schematic structural diagram of a positioning I-shaped steel connecting plate according to an embodiment of the present invention;
in the figure: 1. an intermediate section; 2. a tagging segment; 3. connecting a joint; 4. end concrete; 5. a crown beam; 6. a batten plate; 7. h-shaped steel; 8. the flange is externally connected with a steel plate; 9. a high-strength bolt; 10. the web plate is connected with the steel plate; 11. connecting steel plates in the flanges; 12. a gantry crane; 13. hoisting the cable; 14. a temporary locator; 15. a long bolt hole; 16. a temporary positioning bolt; 17. pressing a plate; 18. adjusting the nut; 19. balancing the cushion block; 20. fixing a steel plate; 21. an expansion bolt; 22. an ear plate; 23. a length adjustable compression bar; 24. a length adjustable pull rod; 25. positioning an I-shaped steel connecting plate; 26. a T-shaped connecting plate; 27. high-strength friction bolts; 28. a long round hole; 29. positioning the I-shaped steel; 30. and (4) a building envelope.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 2 to 3, the present embodiment provides an assembly type foundation pit steel supporting structure, which includes a crown beam 5, a prefabricated steel support, a temporary positioner 14, and a vertical construction error adjuster for adjusting a vertical construction error of the prefabricated steel support; the prefabricated steel support is formed by sequentially splicing two end sections 2 and a plurality of middle sections 1 arranged between the two end sections 2 through connecting joints 3; the end part of the end section 2 is poured with end concrete 4, the end part of the end section 2 and the end concrete 4 both partially extend into the crown beam 5, and the end concrete 4 and the crown beam 5 are integrally poured and formed; one end of the vertical construction error regulator is connected with the enclosure structure 30, and the other end of the vertical construction error regulator is connected with the head section 2 through the temporary positioner 14. In the embodiment, the rigid connection between the sections of the prefabricated steel support is realized through the connecting joint 3, the end part of the end section 2 and the end concrete 4 are partially extended into the crown beam 5, and the end concrete 4 and the crown beam 5 are integrally cast to realize the rigid connection between the end section 2 and the crown beam 5, so that the same or even higher strength of the conventional concrete support can be realized, and the integrity and the safety of a foundation pit are ensured; and the vertical construction error is accurately adjusted through the vertical construction error adjuster, and the prefabricated steel support is positioned by adopting the temporary positioner 14, so that accurate construction can be realized.
The crown beam 5 of the embodiment is provided with the steel bars as required, and the head sections 2 can be tightly connected with the steel bars in the crown beam 5, so that the integrity and the node strength of the steel supporting structure are improved. In the embodiment, after the building envelope is constructed, a vertical construction error regulator can be arranged on the vertical plane of the inner side of the building envelope at intervals of 2-5 m.
Further, the vertical construction error regulator comprises a positioning I-shaped steel 29, a positioning I-shaped steel connecting plate 25, a T-shaped connecting plate 26 and two push-pull mechanisms arranged on two sides of the prefabricated steel support; one end of each push-pull mechanism is connected with the enclosure structure 30, and the other end of each push-pull mechanism is connected with a parallel plate of a T-shaped connecting plate 26; the upper flange plate of the positioning I-shaped steel 29 is fixed with the bottom of the end section 2 through the temporary positioner 14, and the positions, which are positioned at two sides of the prefabricated steel support, on the lower flange plate of the positioning I-shaped steel 29 are respectively connected with positioning I-shaped steel connecting plates 25; the vertical plate of the T-shaped connecting plate 26 and the positioning I-shaped steel connecting plate 25 are both provided with oblong holes 28, and high-strength friction bolts 27 penetrate through the vertical plate of the T-shaped connecting plate 26 and the oblong holes 28 in the positioning I-shaped steel connecting plate 25 to fix the vertical plate and the positioning I-shaped steel connecting plate. As shown in fig. 10 and 15, the vertical plate of the T-shaped connecting plate 26 of the present embodiment is inserted between a pair of positioning i-shaped steel connecting plates 25, and the T-shaped connecting plate 26 and the positioning i-shaped steel connecting plates 25 transmit force by the friction force of the high-strength friction-type bolt 27, so as to ensure the stability of the connecting node; the long round holes 28 are arranged in the vertical direction, and as shown in fig. 16, the push-pull mechanism drives the positioning I-shaped steel 29 to move up and down to be matched with the long round holes 28, so that the error of the prefabricated steel support in the vertical direction is adjusted.
As an embodiment, the push-pull mechanism comprises a length-adjustable pressure bar 23 and a length-adjustable pull bar 24; one end of the length-adjustable pull rod 24 and one end of the length-adjustable press rod 23 are respectively connected with the envelope structure 30 through hinged supports, the other end of the length-adjustable pull rod 24 is connected with the length-adjustable press rod 23, and the other end of the length-adjustable press rod 23 is connected with the parallel plate of the T-shaped connecting plate 26. As shown in fig. 10, the length-adjustable tension rod 24 is located above the length-adjustable compression rod 23 and connected with the length-adjustable compression rod 23, and the vertical construction error is adjusted by matching the length-adjustable compression rod 23 and the length-adjustable tension rod 24.
Further, the temporary positioner 14 includes a pressure plate 17, a temporary positioning bolt 16, an adjusting nut 18 and a balance pad 19; one end of the pressure plate 17 presses the bottom of the head section 2 on the upper flange plate of the positioning I-shaped steel 29, and the other end of the pressure plate presses on the upper flange plate of the positioning I-shaped steel 29 through the balance cushion block 19; the temporary positioning bolt 16 passes through the pressing plate 17 and the upper flange plate of the positioning I-shaped steel 29 and is fixed through an adjusting nut 18. The upper flange plate of the positioning i-shaped steel 29 of the embodiment is provided with a long bolt hole 15, as shown in fig. 12, the position of the upper flange plate is matched with the installation position of the prefabricated steel supported H-shaped steel 7, the corresponding position of the pressing plate 17 is provided with a long bolt hole 15, and the pressing plate 17 is connected with the positioning i-shaped steel 29 by passing a temporary positioning bolt 16 through the long bolt hole 15, so that the bottom of the head section 2 is fixed on the positioning i-shaped steel 29. In addition, the pressure plate 17 of the temporary positioner 14 is connected with the positioning I-shaped steel 29 of the vertical construction error regulator through bolts, so that the installation and the disassembly are convenient, and the temporary positioner 14 and the vertical construction error regulator can be recycled.
Furthermore, the hinged support comprises a fixed steel plate 20 and an ear plate 22, the ear plate 22 is fixed on the fixed steel plate 20, and the fixed steel plate 20 is connected with the building enclosure 30 through an expansion bolt 21; one end of the length-adjustable pull rod 24 or one end of the length-adjustable press rod 23 is hinged with the ear plate 22 to form a rotatable hinged joint.
Further, the head section 2 and the middle section 1 are both of a double H-shaped steel structure and are formed by welding two H-shaped steels 7 side by side along the length direction of the H-shaped steel structure. As shown in fig. 2 to 4, the upper flange plate and the lower flange plate of the two H-shaped steels 7 of the middle section 1 and the head section 2 of the present embodiment are welded by the gusset plate 6, respectively, and the formed support section has good strength, rigidity and stability; the size of the H-shaped steel 7 is selected according to the calculated stress of the foundation pit, and a common model in the market is preferred; the batten plates 6 are arranged at intervals along the supporting direction, the distance is preferably 0.6-1.0m, the shape is preferably square, the side length is the same as the distance between the center lines of the webs of the two H-shaped steels 7 of the double H-shaped steel, and the thickness is not less than 10 mm.
Further, as shown in fig. 5 to 6, the connection joint 3 includes an outer flange connection steel plate 8, an inner flange connection steel plate 11, and a web connection steel plate 10; the outer side and the inner side of the flange plate of the H-shaped steel 7 at the joint of the two sections are respectively provided with the flange outer connecting steel plate 8 and the flange inner connecting steel plate 11, and the flange outer connecting steel plate 8, the flange inner connecting steel plate 11 and the flange plate of the H-shaped steel 7 of the two sections are connected through a high-strength bolt 9; two sides of the web plate of the H-shaped steel 7 at the joint of the two sections are provided with web plate connecting steel plates 10, and the web plate connecting steel plates 10 at the two sides are connected with the web plate of the H-shaped steel 7 at the two sections through high-strength bolts 9. Bolt holes through which the high-strength bolts 9 penetrate are reserved in flange plates and web plates of the H-shaped steel 7 at the joints of the two sections in the embodiment, bolt holes through which the high-strength bolts 9 penetrate are reserved in corresponding positions of the flange outer connecting steel plate 8, the web plate connecting steel plate 10 and the flange inner connecting steel plate 11, rigid connection among the sections of the prefabricated steel support is achieved through the connecting joints 3, and the rigidity and the strength of the prefabricated steel support are guaranteed; and the two sections are connected with the connecting joint 3 by bolts, so that the mounting and dismounting are convenient, and the recycling is facilitated.
In this embodiment, the flange outer connecting steel plate 8, the web connecting steel plate 10, and the flange inner connecting steel plate 11 may be changed in shape, size, thickness, and the like as needed; the number and the diameter of the high-strength bolts 9 are determined according to calculation, and the rigid connection of the connecting nodes 3 is guaranteed; as an embodiment, as shown in fig. 7-9, the flange-outside connecting steel plate 8 is located above and below the flange of the joint, and is square with a groove, and the groove provides space for screwing the high-strength bolt 9, and may not be provided, and the width of the flange-outside connecting steel plate 8 is the same as that of the prefabricated steel support; the flange inner connecting steel plate 11 is positioned on the inner side of the flange of the H-shaped steel 7, 4 pieces of flange inner connecting steel plates are rectangular steel plates, and the positions and the lengths of bolt holes are the same as those of the flange outer connecting steel plate 8; the web connecting steel plates 10 are rectangular steel plates and are used for fixing webs of the H-shaped steel 7, and the end heads of the two H-shaped steel 7 are connected through the four web connecting steel plates 10 through high-strength bolts 9.
As shown in fig. 1 to 16, the present embodiment further provides a construction method of the fabricated foundation pit steel support structure, including the following steps:
s1, manufacturing the head section 2 and the middle section 1 of the prefabricated steel support, manufacturing the flange outer connecting steel plate 8, the web connecting steel plate 10 and the flange inner connecting steel plate 11 of the connecting joint 3 in a factory according to a design drawing, and transporting to a construction site;
s2, sequentially assembling and forming the middle sections 1 through the connecting joints 3 according to the width of the foundation pit; the middle section 1 of the embodiment is formed by early splicing and is hoisted into a foundation pit by using a gantry crane 12, or can be hoisted into the foundation pit section by section and spliced in the foundation pit;
s3, installing a vertical construction error regulator, and connecting one end of the vertical construction error regulator with the enclosure structure 30;
the method specifically comprises the following steps: firstly, constructing the enclosure structure 30, and after the construction of the enclosure structure 30 is finished; driving expansion bolts 21 into the enclosure structure 30, fixing the fixed steel plate 20 on the enclosure structure 30 through the expansion bolts 21, and welding lug plates 22 on the fixed steel plate 20;
then, one end of the length-adjustable pressure lever 23 and one end of the length-adjustable pull rod 24 are respectively hinged with the corresponding ear plate 22, the other end of the length-adjustable pull rod 24 is connected with the length-adjustable pressure lever 23, and the other end of the length-adjustable pressure lever 23 is welded with a horizontal plate of a T-shaped connecting plate 26;
welding a positioning I-shaped steel connecting plate 25 on a positioning I-shaped steel 29, and fixing the positioning I-shaped steel connecting plate 25 and a vertical plate of a T-shaped connecting plate 26 through a high-strength friction bolt 27 penetrating through a long circular hole 28 of the positioning I-shaped steel connecting plate 25;
s4, splicing the end sections 2 of the middle sections 1 at the two ends through connecting joints 3 to form a prefabricated steel support;
s5, before construction of the crown beam 5, positioning in advance in the crown beam 5, hoisting the prefabricated steel support by using a gantry crane 12 and putting the prefabricated steel support into an appointed position, enabling two end sections 2 of the prefabricated steel support to be respectively supported on the enclosure structures 30 on two sides, meanwhile, the end section 2 of the prefabricated steel support is also supported on the positioning I-shaped steel 29, and after rough positioning, adjusting the vertical construction error of the prefabricated steel support through the length-adjustable pressure rod 23 and the length-adjustable pull rod 24; after the error adjustment is finished, the positioning I-shaped steel 29 and the end section 2 are connected through the temporary positioner 14, specifically: the bottom of the head section 2 is pressed on the upper flange plate of the positioning I-shaped steel 29 through one end of a pressure plate 17 of the temporary positioner 14, and the other end of the pressure plate 17 is pressed on the upper flange plate of the positioning I-shaped steel 29 through a balance cushion block 19; then, a temporary positioning bolt 16 penetrates through the pressing plate 17 and the upper flange plate of the positioning I-shaped steel 29 and is fixed through an adjusting nut 18, so that the purpose of temporary positioning is achieved;
and S6, integrally casting and molding the end concrete 4 at the end part of the end section 2 and the crown beam 5, so that the prefabricated steel support and the crown beam 5 form a rigid whole.
Excavation of foundation pit, accomplish the inner structure construction back, demolish attach fitting 3, chisel out end concrete 4, demolish interim locator 14, accomplish end section 2, middle section 1 and vertical construction error regulator's recycle, solved cast in situ concrete and the painful point of demolising, and green.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an assembled foundation ditch steel bearing structure which characterized in that: the device comprises a crown beam, a prefabricated steel support, a temporary positioner and a vertical construction error regulator for regulating the vertical construction error of the prefabricated steel support; the prefabricated steel support is formed by sequentially splicing two end sections and a plurality of middle sections arranged between the two end sections through connecting joints; the end part of the end section is cast with end concrete, the end part of the end section and the end concrete partially extend into the crown beam, and the end concrete and the crown beam are integrally cast; one end of the vertical construction error regulator is connected with the enclosure structure, and the other end of the vertical construction error regulator is connected with the end head section through the temporary positioner.
2. The fabricated foundation pit steel support structure of claim 1, wherein: the vertical construction error regulator comprises a positioning I-shaped steel, a positioning I-shaped steel connecting plate, a T-shaped connecting plate and two push-pull mechanisms arranged on two sides of the prefabricated steel support; one end of each push-pull mechanism is connected with the enclosure structure, and the other end of each push-pull mechanism is connected with a parallel plate of a T-shaped connecting plate; the upper flange plate of the positioning I-shaped steel is fixed with the bottom of the end section through the temporary positioner, and the positions, which are positioned on two sides of the prefabricated steel support, on the lower flange plate of the positioning I-shaped steel are respectively connected with a positioning I-shaped steel connecting plate; and the vertical plate of the T-shaped connecting plate and the positioning I-shaped steel connecting plate are both provided with long round holes, and the T-shaped connecting plate and the positioning I-shaped steel connecting plate are fixed by high-strength friction bolts penetrating through the vertical plate of the T-shaped connecting plate and the long round holes on the positioning I-shaped steel connecting plate.
3. The fabricated foundation pit steel support structure of claim 2, wherein: the push-pull mechanism comprises a length-adjustable compression bar and a length-adjustable pull bar; one end of the length-adjustable pull rod and one end of the length-adjustable pressure rod are respectively connected with the enclosure structure through hinged supports, the other end of the length-adjustable pull rod is connected with the length-adjustable pressure rod, and the other end of the length-adjustable pressure rod is connected with the parallel plates of the T-shaped connecting plate.
4. The fabricated foundation pit steel support structure of claim 2, wherein: the temporary positioner comprises a pressure plate, a temporary positioning bolt, an adjusting nut and a balance cushion block; one end of the pressure plate presses the bottom of the end section onto the upper flange plate of the positioning I-shaped steel, and the other end of the pressure plate presses the upper flange plate of the positioning I-shaped steel through the balance cushion block; the temporary positioning bolt penetrates through the pressing plate and the upper flange plate of the positioning I-shaped steel and is fixed through an adjusting nut.
5. The fabricated foundation pit steel support structure of claim 3, wherein: the hinged support comprises a fixed steel plate and an ear plate, the ear plate is fixed on the fixed steel plate, and the fixed steel plate is connected with the enclosure structure through an expansion bolt; one end of the length-adjustable pull rod or one end of the length-adjustable pressure rod is hinged with the ear plate.
6. An assembly foundation pit steel support structure as claimed in any one of claims 1-5, wherein: the end section and the middle section are both of a double H-shaped steel structure and are formed by welding two pieces of H-shaped steel side by side along the length direction of the H-shaped steel structure.
7. The fabricated foundation pit steel support structure of claim 6, wherein: the connecting joint comprises a flange outer connecting steel plate, a flange inner connecting steel plate and a web connecting steel plate; the outer side and the inner side of the H-shaped steel flange plate at the joint of the two sections are respectively provided with the flange outer connecting steel plate and the flange inner connecting steel plate, and the flange outer connecting steel plate, the flange inner connecting steel plate and the H-shaped steel flange plates of the two sections are connected through high-strength bolts; two sides of the H-shaped steel web at the joint of the two sections are both provided with web connecting steel plates, and the web connecting steel plates at the two sides are connected with the H-shaped steel webs of the two sections through high-strength bolts.
8. A construction method of the fabricated foundation pit steel support structure according to any one of claims 1 to 7, comprising the steps of:
s1, manufacturing an end section and a middle section of the prefabricated steel support in a factory, and transporting the end section and the middle section to a construction site;
s2, sequentially assembling and forming a plurality of middle sections through connecting joints according to the width of the foundation pit;
s3, installing a vertical construction error regulator, and connecting one end of the vertical construction error regulator with the enclosure structure;
s4, splicing the end sections of the middle sections at the two ends through connecting joints to form a prefabricated steel support;
s5, before the construction of the crown beam, hoisting the prefabricated steel support by using a gantry crane to be placed at an appointed position, enabling two end sections of the prefabricated steel support to be respectively supported on the enclosure structures at two sides, simultaneously enabling the end section of the prefabricated steel support to be also supported at the other end of the vertical construction error regulator, and regulating the vertical construction error of the prefabricated steel support through the vertical construction error regulator; after the error adjustment is finished, connecting the other end of the vertical construction error adjuster with the end head section through a temporary positioner;
and S6, integrally casting and molding the head concrete at the end of the head section and the crown beam.
9. The construction method of the fabricated foundation pit steel support structure according to claim 8, wherein the specific method for installing the vertical construction error regulator in the step S3 is as follows:
an expansion bolt is driven into the enclosure structure, the fixing steel plate is fixed on the enclosure structure through the expansion bolt, and an ear plate is welded on the fixing steel plate;
one end of the length-adjustable pressure rod and one end of the length-adjustable pull rod are respectively hinged with the corresponding ear plates, the other end of the length-adjustable pull rod is connected with the length-adjustable pressure rod, and the other end of the length-adjustable pressure rod is connected with a horizontal plate of a T-shaped connecting plate;
and welding a positioning I-shaped steel connecting plate on the positioning I-shaped steel, and fixing the positioning I-shaped steel connecting plate and the T-shaped steel through a high-strength friction bolt which penetrates through a vertical plate of the T-shaped connecting plate and a long circular hole on the positioning I-shaped steel connecting plate.
10. The construction method of the fabricated foundation pit steel supporting structure according to claim 9, wherein in step S5, the prefabricated steel support vertical construction error is adjusted through the length adjustable pressing rod and the length adjustable pulling rod, after the error adjustment is finished, the bottom of the head section is pressed on the upper flange plate of the positioning i-shaped steel through one end of the pressing plate of the temporary positioner, and the other end of the pressing plate is pressed on the upper flange plate of the positioning i-shaped steel through the balance cushion block; then, a temporary positioning bolt penetrates through the pressing plate and the upper flange plate of the positioning I-shaped steel and is fixed through an adjusting nut.
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| CN117626999A (en) * | 2024-01-25 | 2024-03-01 | 中铁十五局集团有限公司 | Hinged locking type steel support applied to foundation pit and construction method thereof |
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