CN111042185B - Construction method of basement raft foundation with tower crane foundation - Google Patents
Construction method of basement raft foundation with tower crane foundation Download PDFInfo
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- CN111042185B CN111042185B CN202010032454.2A CN202010032454A CN111042185B CN 111042185 B CN111042185 B CN 111042185B CN 202010032454 A CN202010032454 A CN 202010032454A CN 111042185 B CN111042185 B CN 111042185B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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Abstract
The invention discloses a construction method of a basement raft foundation with a tower crane foundation, which specifically comprises the following steps: excavating a tower crane foundation pit, arranging double-layer reinforcing steel bars of a tower crane foundation, embedding four groups of embedded foundation bolts, respectively sleeving four steel sleeves on the outer side of each group of embedded foundation bolts, welding the lower ends of the steel sleeves with upper-layer reinforcing steel bars of the tower crane foundation, and enabling the upper ends of the steel sleeves to be as high as the top elevation of a raft foundation to be constructed; pouring concrete into a tower crane foundation pit, integrally pouring and molding the steel sleeves and the concrete in the tower crane foundation, mounting a tower crane, and connecting and fixing four connecting ends of a tower crane foundation section with the embedded foundation bolts in the corresponding four steel sleeves respectively so that the tower crane works normally; and normally arranging ribs on the raft foundation, pouring concrete, finishing the raft foundation by one-time construction, and curing and molding. The raft foundation can be integrally constructed at one time, so that the construction efficiency is improved, and the problems of reinforcement binding, waterproof treatment, secondary hole filling and the like of a reserved area of a tower crane foundation are solved.
Description
Technical Field
The invention relates to the field of buildings, in particular to a construction method of a basement raft foundation with a tower crane foundation.
Background
In recent years, with the continuous development of the building industry in China, the number of high-rise group buildings built in various large and medium-sized cities is increased day by day, raft projects of an integral garage are frequently seen, factors such as reduction of secondary carrying of building materials, transportation distance in the yard and the like are considered, a tower crane is often erected beside a main building, a conventional tower crane foundation is generally located on a foundation or a bearing platform foundation of a pile foundation at present and then is connected with a connecting end of a tower crane foundation section through pre-buried foundation bolts, and the technology is mature.
However, when a tower crane foundation located in a basement is constructed, foundation construction and installation are often performed on the tower crane foundation before earth excavation, so that the construction service for an underground structure is performed as early as possible, and therefore the conditions of overlapping and joint seams exist in the construction of the tower crane foundation and the raft foundation.
Although the construction method is definite in stress and convenient to construct, secondary construction of the post-cast strip is achieved, the area of the post-cast strip is small, the steel bars of the peripheral raft foundation need to be reserved in advance, and steel bar connection with the peripheral reserved steel bars needs to be carried out one by one during secondary construction of the reserved area.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the method for constructing the basement raft foundation with the tower crane foundation is provided, the reservation of the tower crane foundation is not needed to be considered, the raft foundation can be integrally constructed at one time, the construction efficiency is improved, and the problems of reinforcement binding, waterproof treatment, secondary hole filling and the like in the reserved area of the tower crane foundation are solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a construction method of a basement raft foundation with a tower crane foundation specifically comprises the following steps: a, determining the installation position of a tower crane according to a construction drawing, and excavating a foundation pit of the tower crane by using a backhoe excavator; b, pouring a tower crane foundation cushion layer at the bottom of the tower crane foundation pit; c, arranging double-layer reinforcing steel bars of the tower crane foundation according to a drawing, then paying off according to the drawing installed at the connecting end of the tower crane foundation section to determine the corresponding positions of the embedded foundation bolts, embedding four groups of embedded foundation bolts, then respectively sleeving the outer sides of each group of embedded foundation bolts by adopting four steel sleeves, welding the lower ends of the steel sleeves with the upper-layer reinforcing steel bars in the tower crane foundation, and enabling the upper ends of the steel sleeves to be as high as the top elevation of the raft foundation to be constructed; d, confirming the position of the embedded foundation bolt again by adopting measuring equipment; e, after the position of the embedded foundation bolt is confirmed to be correct, pouring concrete into the tower crane foundation pit until the steel sleeve is filled with concrete to form a steel pipe column, integrally pouring the steel sleeve and the concrete in the tower crane foundation to form a whole, and finally flattening and maintaining the tower crane foundation; f, after the tower crane foundation is maintained, the tower crane is installed when the strength of concrete reaches the standard, four connecting ends of a tower crane foundation section are respectively connected and fixed with the embedded foundation bolts in the four corresponding steel sleeve pipes, the tower crane is installed, the tower crane works normally, and preparation materials of a basement to be constructed and a raft foundation are hoisted; g, when the raft foundation is constructed, normally arranging ribs on the raft foundation, pouring concrete, completing the raft foundation through one-time construction, and curing and forming; and h, when the tower crane is subsequently dismantled, the steel pipe columns are left in the raft foundation to form a part of the raft foundation, and after the tower crane foundation section is dismantled, the reserved foundation bolt parts protruding out of the upper surface of the raft foundation are cut off to complete the dismantling of the tower crane.
According to the invention, the embedded anchor bolt is arranged in the steel sleeve and is formed with the tower crane foundation in a one-time pouring manner to form the steel pipe column, after the tower crane foundation section and the embedded anchor bolt of the steel pipe column are installed, because the anchoring depth of the embedded anchor bolt is unchanged, the steel pipe column is enclosed outside the part, extending out of the top surface of the tower crane foundation, of the embedded anchor bolt, so that the bending strength of the embedded anchor bolt extending out of the tower crane foundation part can be ensured, the outer diameter of the steel sleeve is slightly larger than the size of the connecting end of the tower crane foundation section, after the steel sleeve and concrete form the steel pipe column, the upper end surface of the steel pipe column is in contact with the connecting end of the tower crane foundation section, the contact area with the connecting end of the tower crane foundation section can be ensured, compared with the traditional mode of installing the tower crane foundation section, the; at the in-process of construction raft foundation, when raft foundation construction was located to the tower crane, can once only be under construction and accomplish for raft foundation in the tower crane installing zone need not like the conventionality reserved area, and carry out the secondary binding off, solved the interior reinforcement ligature of tower crane reserved area and be not conform to the construction quality problems such as standard, water repellent is inconvenient and the secondary mends the hole, when in-service use, can increase the size of the pre-buried rag bolt of former design, guarantee its atress.
Before raft foundation construction and after tower crane installation are completed, because the engineering is still in a material preparation stage, the tower body is in a short state, the borne wind load is small, and only the bending moment force of normal operation of the tower crane needs to be borne, the load and the bending moment force borne by the stage can be completely met through the combination of the tower crane foundation and the steel pipe column, so that the safe and normal operation of the tower crane is ensured, and the size of the originally designed embedded foundation bolt can be increased to ensure the stress of the embedded foundation bolt during actual use; after raft foundation construction accomplished, raft foundation combines into an organic whole with the steel-pipe column, raft foundation has the constraint effect to the steel-pipe column, similar with integrated into one piece's in the current construction tower crane foundation, can fill its safe handling, even, be located the form of steel-pipe column through pre-buried rag bolt, the steel-pipe column can improve pre-buried rag bolt's antidumping ability, pre-buried rag bolt is more firm on than current traditional tower crane foundation, can bear bigger load, the security performance is higher.
And c, in the step b, after the tower crane foundation bed course is poured at the bottom of the tower crane foundation pit, building a brick moulding bed on the peripheral side wall of the tower crane foundation pit, building the brick moulding bed to the elevation of the bottom of the raft foundation, and then arranging waterproof additional layers made of flexible waterproof coiled materials above the tower crane foundation bed course and on the inner side of the brick moulding bed.
Therefore, the brick masonry serves as an outer side template, compared with a conventional wood template, the brick masonry has high strength, is not easy to slip and expand, and does not need to be disassembled after construction, so that the strength of the tower crane foundation is enhanced, and the tower crane foundation is protected to a certain extent; the tower crane foundation bed course has certain guard action to the tower crane foundation, then through set up waterproof additional layer with the brick fetal membrane inboard on the tower crane foundation bed course, can play waterproof effect to the tower crane foundation, prevents that groundwater from getting into the tower crane foundation in, the reinforcing bar corrodes, influences the intensity of tower crane foundation.
As optimization, be provided with the pea gravel concrete protective layer on the waterproof additional layer, tower crane foundation bottom is located pea gravel concrete protective layer.
In this way, by providing the fine aggregate concrete protective layer, it is possible to prevent a sharp object from piercing the waterproof additional layer to destroy the waterproof property thereof, and the thickness of the fine aggregate concrete protective layer is usually set to 50mm to 70 mm.
In the step c, after the steel sleeve is sleeved on the embedded foundation bolt, a plurality of layers of criss-cross distribution ribs are arranged in the steel sleeve, and the distribution ribs are distributed on the periphery of the embedded foundation bolt to limit the embedded foundation bolt so as to prevent the embedded foundation bolt from being dislocated during concrete pouring.
Like this, when the tower crane installation, it is very high to pre-buried rag bolt's required precision, through set up the distribution muscle in the steel casing, can ensure that pre-buried rag bolt does not take place to shift when concreting to guarantee pre-buried rag bolt's installation accuracy.
As optimization, after the distribution ribs are arranged, a plurality of horizontally arranged water stop rings are welded on the outer wall of the steel sleeve, and the plurality of water stop rings are sleeved on the steel sleeve and distributed at equal intervals in the axial direction of the steel sleeve.
Like this, through setting up the seal ring, the route of extension water infiltration, greatly increased the infiltration resistance, waterproof performance between when ensureing follow-up raft foundation construction and the steel casing pipe, simultaneously through the setting of seal ring, when the concrete of follow-up raft foundation of pouring, seal ring and steel casing pipe have constituted the function of horse tooth raft, have strengthened the associativity of steel casing pipe with raft foundation, raft foundation has played the additional strengthening to the stability of steel casing pipe to tower crane work is safer.
And optimally, after the arrangement of the water stop rings is finished, a cross-shaped steel bracket consisting of two rigid connecting rods with the middle parts welded in a crossed manner is arranged in an area surrounded by the four steel sleeves, the steel bracket is horizontally arranged to limit the steel sleeves, and the four end parts of the steel bracket are respectively abutted against the corresponding steel sleeves and are welded and fixed.
Thus, during actual construction, the rigid connecting piece is generally made of I-shaped steel, the strength can be ensured, when the concrete of the tower crane foundation is poured, because the foundation pit of the tower crane foundation is generally deep, large-volume concrete pouring is involved, the concrete can be vibrated for many times, the welding stability of the steel sleeve and the reinforcing steel bar of the tower crane foundation is not high enough, the steel sleeve is likely to be displaced by the vibration effect of the concrete, the positions of the four steel sleeves are limited and fixed by arranging the steel bracket, the embedded anchor bolts in the corresponding steel sleeves cannot be moved, the installation precision of a subsequent tower crane is ensured, more importantly, before the subsequent raft foundation is not constructed, when the tower crane is installed on the tower crane foundation to work, the steel bracket has a transverse supporting and limiting effect on the steel sleeve under the influence of shearing force (wind force and hoisting force) so as to ensure the anti-overturning capability of the tower crane, the anti-overturning capacity of the tower crane is improved.
Preferably, the connecting point of the steel bracket and the steel sleeve is positioned in the middle of the steel sleeve.
Like this, when subsequent raft foundation construction, raft foundation has upper and lower layer reinforcing bar, lies in the middle part position of steel casing pipe with the tie point of steel support and steel casing pipe, staggers with the upper and lower layer reinforcing bar of raft foundation like this, can not influence arranging of raft foundation reinforcing bar, and steel support contacts with the middle part position of steel casing pipe simultaneously, and the upper and lower both ends atress of steel casing pipe is more steady like this, is difficult to empty.
And e, in the step e, when concrete is poured into the tower crane foundation pit, firstly pouring the concrete into the tower crane foundation pit until the concrete is flush with the surface of the tower crane foundation pit, after 10-20min, pouring the concrete into the steel sleeve before the concrete is not initially set in the tower crane foundation pit, and then pouring the concrete into the steel sleeve until the steel sleeve is filled with the concrete.
Thus, after 10-20min, before the concrete in the tower crane foundation pit is not initially set, the flowability of the concrete in the tower crane foundation pit is deteriorated, when the concrete is poured into the steel sleeve, the concrete in the steel sleeve cannot largely gush into the tower crane foundation, the concrete in the steel sleeve can be rapidly poured fully, the concrete cannot enter the tower crane foundation pit to enable the concrete to overflow the tower crane foundation pit, and meanwhile, the steel sleeve and the concrete in the tower crane foundation can be integrally poured and formed.
In conclusion, the beneficial effects of the invention are as follows: by arranging the steel pipe columns on the tower crane foundation, when the raft foundation is constructed to the tower crane, one-time construction can be completed, so that the raft foundation in the tower crane installation area does not need to reserve an area like a conventional method, and secondary closing-in is performed, thereby solving the construction quality problems that the steel bar binding in the tower crane reserve area is not in accordance with the standard, the waterproof treatment is inconvenient, the secondary hole filling is performed and the like; after raft foundation construction was accomplished, through the form of steel-pipe column, pre-buried rag bolt is more firm on than current traditional tower crane basis, can bear bigger load, and the security performance is higher.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a structure involved in the method of the present invention;
FIG. 2 is an enlarged view of A in FIG. 1;
fig. 3 is a top view of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Reference numerals in the drawings of the specification include: the tower crane foundation comprises a tower crane foundation 1, a tower crane foundation cushion layer 2, a waterproof additional layer 3, a brick moulding bed 4, pre-buried foundation bolts 5, a water stop ring 6, a steel sleeve 7, distribution ribs 8, a tower crane foundation section 9 and a raft foundation 10.
In this specific embodiment, a basement raft foundation construction method with a tower crane foundation, as shown in fig. 1, fig. 2 and fig. 3, specifically includes the following steps: a, determining the installation position of a tower crane according to a construction drawing, and excavating a foundation pit of the tower crane by using a backhoe excavator; b, pouring a tower crane foundation cushion layer 2 at the bottom of the tower crane foundation pit; c, arranging double-layer steel bars of the tower crane foundation according to a drawing, then paying off according to the drawing installed at the connecting end of the tower crane foundation section 9 to determine the corresponding positions of the embedded foundation bolts 5, embedding four groups of embedded foundation bolts 5, then respectively sleeving the outer sides of each group of embedded foundation bolts 5 by adopting four steel sleeves 7, welding the lower ends of the steel sleeves 7 with upper-layer steel bars of the tower crane foundation 1, and enabling the upper ends of the steel sleeves 7 to be as high as the top elevation of a raft foundation 10 to be constructed; d, confirming the position of the embedded foundation bolt 5 again by adopting measuring equipment; e, after the position of the embedded foundation bolt 5 is confirmed to be correct, pouring concrete into the tower crane foundation pit until the steel sleeve 7 is filled with concrete to form a steel pipe column, integrally pouring the steel sleeve 7 and the concrete in the tower crane foundation to form a whole, and finally flattening and maintaining the tower crane foundation 1; f, after the tower crane foundation 1 is maintained, a tower crane is installed when the strength of concrete reaches the standard, four connecting ends of a tower crane foundation section 9 are respectively connected and fixed with the embedded foundation bolts 5 in the corresponding four steel sleeves 7, the installation of the tower crane is completed, the tower crane works normally, and preparation materials of a basement to be constructed and a raft foundation 10 are hoisted; g, when the raft foundation 10 is constructed, normally arranging ribs on the raft foundation 10, pouring concrete, completing the raft foundation 10 by one-time construction, and curing and forming; and h, when the tower crane is subsequently dismantled, the steel pipe columns are left in the raft foundation to form a part of the raft foundation, and after the tower crane foundation section is dismantled, the reserved foundation bolt parts protruding out of the upper surface of the raft foundation are cut off to complete the dismantling of the tower crane.
In the invention, the pre-embedded foundation bolts 5 are arranged in the steel sleeve 7 and are formed with the tower crane foundation 1 by one-time pouring to form a steel pipe column, after the tower crane foundation section 9 is installed with the pre-embedded foundation bolts 5 of the steel pipe column, because the anchoring depth of the embedded foundation bolt 5 is not changed, the steel pipe column is enclosed at the outer side of the part of the embedded foundation bolt 5 extending out of the top surface of the tower crane foundation 1, thereby not only ensuring the bending strength of the part of the embedded foundation bolt 5 extending out of the tower crane foundation, and the outer diameter of the steel sleeve 7 is slightly larger than the size of the connecting end of the tower crane foundation section 9, after the steel sleeve 7 and concrete form a steel pipe column, the upper end face of the steel pipe column is in contact with the connecting end of the tower crane foundation section 9, so that the contact area with the connecting end of the tower crane foundation section 9 can be ensured, compared with the traditional mode of installing the tower crane foundation section 9, the contact area is not changed, and the steel pipe column also has the restraint and protection effects on the embedded foundation bolt 5; at construction raft foundation 10's in-process, when raft foundation 10 was under construction to tower crane department, can once only be under construction and accomplish, raft foundation 10 in the tower crane installing zone need not like the conventionality reserved area, and carry out the secondary binding off, the construction quality problems such as the reinforcing bar ligature is not conform to the standard in having solved the tower crane reserved area, water repellent treatment is inconvenient and the secondary mends the hole, when in-service use, can increase the size of the pre-buried rag bolt 5 of former design, guarantee its atress.
Before the raft foundation 10 is constructed and after the tower crane is installed, because the engineering is still in a material preparation stage, the tower body is in a short state, the borne wind load is small, and only the bending moment force of the normal work of the tower crane needs to be borne, the load and the bending moment force borne by the stage can be completely met in a mode of combining the tower crane foundation 1 and a steel pipe column, so that the safe and normal work of the tower crane is ensured, and the size of the originally designed embedded foundation bolt 5 can be increased to ensure the stress of the tower crane during actual use; after raft foundation 10 construction was accomplished, raft foundation 10 combines into an organic whole with the steel-pipe column, raft foundation 10 has the restraint effect to the steel-pipe column, similar with integrated into one piece's in the current construction tower crane basis, can fill its safe handling, even, be located the form of steel-pipe column through pre-buried rag bolt 5, the steel-pipe column can improve pre-buried rag bolt 5's antidumping ability, pre-buried rag bolt 5 is more firm on than current traditional tower crane basis, can bear bigger load, the security performance is higher.
In a specific embodiment, in the step b, after the tower crane foundation bed course 2 is poured at the bottom of the tower crane foundation pit, the brick bed moulds 4 are built on the peripheral side walls of the tower crane foundation pit, the brick bed moulds 4 are built to the elevation position of the bottom of the raft foundation 10, and then the waterproof additional layers 3 made of flexible waterproof coiled materials are arranged above the tower crane foundation bed course 2 and on the inner sides of the brick bed moulds 4.
Therefore, the brick masonry serves as an outer side template, compared with a conventional wood template, the brick masonry has high strength, is not easy to escape from a mold and expand the mold, does not need to be disassembled after construction, enhances the strength of the tower crane foundation 1 and plays a certain role in protecting the tower crane foundation 1; tower crane foundation bed course 2 has certain guard action to the tower crane foundation, then through on tower crane foundation bed course 2 with 4 inboards of brick fetal membrane set up waterproof additional layer 3, can play waterproof effect to tower crane foundation 1, prevent that groundwater from getting into tower crane foundation 1 in, the reinforcing bar corrodes, influences tower crane foundation 1's intensity.
In a specific embodiment, a fine aggregate concrete protective layer is arranged on the waterproof additional layer 3, and the bottom of the tower crane foundation is positioned on the fine aggregate concrete protective layer.
In this way, by providing the fine aggregate concrete protective layer, it is possible to prevent sharp objects from piercing the waterproof additional layer 3 and thus destroying its waterproof performance, and the thickness of the fine aggregate concrete protective layer is generally set to 50mm to 70 mm.
In a specific embodiment, in the step c, after the steel sleeve 7 is sleeved on the embedded foundation bolt 5, a plurality of layers of criss-cross distribution ribs 8 are configured in the steel sleeve 7, and the distribution ribs 8 are distributed on the peripheral side of the embedded foundation bolt 5 to limit the embedded foundation bolt 5, so as to prevent the embedded foundation bolt 5 from being misplaced during concrete pouring.
Like this, when the tower crane installation, it is very high to pre-buried rag bolt 5's required precision, through set up distribution muscle 8 in steel casing 7, can ensure that pre-buried rag bolt 5 does not take place to shift when concreting to guarantee pre-buried rag bolt 5's installation accuracy.
In a specific embodiment, after the distribution ribs 8 are arranged, a plurality of horizontally arranged water stop rings 6 are welded on the outer wall of the steel sleeve 7, and the plurality of water stop rings 6 are sleeved on the steel sleeve 7 and distributed at equal intervals in the axial direction of the steel sleeve 7.
Like this, through setting up seal ring 6, the route of extension water infiltration, greatly increased the infiltration resistance, waterproof performance between when ensureing follow-up raft foundation 10 construction and steel casing 7, simultaneously through the setting of seal ring 6, when the concrete of follow-up raft foundation 10 is pour, seal ring 6 and steel casing 7 have constituted the function of horse tooth raft, the associativity of steel casing 7 with raft foundation 10 has been strengthened, raft foundation 10 has played the stiffening action to steel casing 7's stability, thereby tower crane work is safer.
In a specific embodiment, after the water stop ring 6 is arranged, a cross-shaped steel bracket formed by two rigid connecting rods with the middle parts welded in a crossed manner is arranged in an area surrounded by the four steel sleeves 7, the steel bracket is horizontally arranged to limit the steel sleeves 7, and four end parts of the steel bracket are respectively abutted against the corresponding steel sleeves 7 and are welded and fixed.
Thus, during actual construction, the rigid connecting piece is generally made of I-shaped steel, the strength can be ensured, when the concrete of the tower crane foundation is poured, because the foundation pit of the tower crane foundation is generally deep, large-volume concrete pouring is involved, the concrete can be vibrated for many times, the welding stability of steel sleeves and reinforcing steel bars of the tower crane foundation is not high enough, the steel sleeves 7 are likely to be displaced by the vibration effect of the concrete, the positions of the four steel sleeves 7 are limited and fixed by arranging the steel brackets, the corresponding embedded foundation bolts 5 in the steel sleeves 7 cannot move, the installation precision of a subsequent tower crane is ensured, more importantly, before the subsequent raft foundation 10 is not constructed, when the tower crane is installed on the tower crane foundation to work, under the influence of shearing force (wind force and hoisting moment force), in order to ensure the anti-overturning capability of the tower crane, the steel support has horizontal support limiting effect to steel casing 7, has improved the antidumping ability of tower crane, and raft foundation construction is accomplished the back, and the steel support is located raft foundation, improves the bearing capacity of raft foundation and steel-pipe column.
In a specific embodiment, the connection point of the steel bracket to the steel casing 7 is located at a middle position of the steel casing 7.
Like this, when subsequent raft foundation 10 is under construction, raft foundation 10 has upper and lower layer reinforcing bar, is located steel casing 7's middle part position with the tie point of steel support and steel casing 7, and the steel support staggers with raft foundation 10's upper and lower layer reinforcing bar like this, can not influence raft foundation 10 arrangement of reinforcing bar, and the steel support contacts with steel casing 7's middle part position simultaneously, and steel casing 7's upper and lower both ends atress is more steady like this, is difficult to empty.
In a specific embodiment, in the step e, when concrete is poured into the tower crane foundation pit, firstly pouring concrete into the tower crane foundation pit until the concrete is flush with the surface of the tower crane foundation pit, after 10-20min, and before the concrete is not initially set in the tower crane foundation pit, pouring concrete into the steel sleeve 7 until the steel sleeve 7 is filled with concrete.
Therefore, after 10-20min, before the concrete in the tower crane foundation pit is not initially set, the flowability of the concrete in the tower crane foundation pit is poor, when the concrete is poured into the steel sleeve 7, the concrete in the steel sleeve 7 cannot largely gush into the tower crane foundation, the concrete of the steel sleeve 7 can be rapidly poured fully, the concrete cannot enter the tower crane foundation pit to enable the concrete to overflow the tower crane foundation pit, and meanwhile, the steel sleeve 7 and the concrete in the tower crane foundation can be integrally poured and formed.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A construction method of a basement raft foundation with a tower crane foundation is characterized in that: the method specifically comprises the following steps:
a, determining the installation position of a tower crane according to a construction drawing, and excavating a foundation pit of the tower crane;
b, pouring a tower crane foundation cushion layer at the bottom of the tower crane foundation pit;
c, arranging double-layer reinforcing steel bars of the tower crane foundation according to a drawing, then paying off according to an installation drawing of a connecting end of a tower crane foundation section, determining corresponding positions of the embedded foundation bolts, embedding four groups of embedded foundation bolts, respectively sleeving the outer sides of each group of embedded foundation bolts by adopting four steel sleeves, welding the lower ends of the steel sleeves with the upper-layer reinforcing steel bars of the tower crane foundation, and enabling the upper ends of the steel sleeves to be as high as the top elevation of a raft foundation to be constructed;
d, confirming the position of the embedded foundation bolt again by adopting measuring equipment;
e, after the position of the embedded foundation bolt is confirmed to be correct, pouring concrete into the tower crane foundation pit until the steel sleeve is filled with concrete to form a steel pipe column, integrally pouring the steel sleeve and the concrete in the tower crane foundation to form a whole, and finally flattening and maintaining the tower crane foundation;
f, after the tower crane foundation is maintained, the tower crane is installed when the strength of concrete reaches the standard, four connecting ends of a tower crane foundation section are respectively connected and fixed with the embedded foundation bolts in the four corresponding steel sleeve pipes, the tower crane is installed, the tower crane works normally, and preparation materials of a basement to be constructed and a raft foundation are hoisted;
g, when the raft foundation is constructed, normally arranging ribs on the raft foundation, horizontally bending a small part of reinforcing steel bars and a part overlapped with the steel sleeve in a small range and winding the space occupied by the steel sleeve to complete rib arrangement of the raft foundation, pouring concrete, completing the raft foundation through one-time construction, and curing and forming;
and h, when the tower crane is subsequently dismantled, the steel pipe columns are left in the raft foundation to form a part of the raft foundation, and after the tower crane foundation section is dismantled, the reserved foundation bolt parts protruding out of the upper surface of the raft foundation are cut off to complete the dismantling of the tower crane.
2. The construction method of the basement raft foundation with the tower crane foundation according to claim 1, characterized in that: in the step b, after the tower crane foundation bed course is poured at the bottom of the tower crane foundation pit, building brick bed moulds on the peripheral side walls of the tower crane foundation pit, building the brick bed moulds to the elevation of the bottom of the raft foundation, and then arranging waterproof additional layers made of flexible waterproof coiled materials above the tower crane foundation bed course and on the inner sides of the brick bed moulds.
3. The construction method of the basement raft foundation with the tower crane foundation of claim 2, wherein: be provided with the pea gravel concrete protective layer on the waterproof additional layer, tower crane foundation bottom is located pea gravel concrete protective layer.
4. The construction method of the basement raft foundation with the tower crane foundation according to claim 1, characterized in that: in the step c, after the steel sleeve is sleeved on the embedded foundation bolt, a plurality of layers of criss-cross distribution ribs are arranged in the steel sleeve, and the distribution ribs are distributed on the periphery of the embedded foundation bolt to limit the embedded foundation bolt so as to prevent the embedded foundation bolt from being dislocated during concrete pouring.
5. The construction method of the basement raft foundation with the tower crane foundation according to claim 4, characterized in that: after the distribution ribs are arranged and finished, a plurality of horizontally arranged water stop rings are welded on the outer wall of the steel sleeve, and the plurality of water stop rings are sleeved on the steel sleeve and distributed at equal intervals in the axial direction of the steel sleeve.
6. The construction method of the basement raft foundation with the tower crane foundation according to claim 5, characterized in that: after the water stop ring is arranged, a cross-shaped steel support formed by two rigid connecting rods with the middle parts welded in a crossed mode is arranged in an area surrounded by the four steel sleeves, the steel support is horizontally arranged to limit the steel sleeves, and the four end portions of the steel support are abutted against the corresponding steel sleeves and are welded and fixed.
7. The construction method of the basement raft foundation with the tower crane foundation of claim 6, wherein: and the connecting point of the steel bracket and the steel sleeve is positioned in the middle of the steel sleeve.
8. The construction method of the basement raft foundation with the tower crane foundation according to claim 1, characterized in that: and e, when concrete is poured into the tower crane foundation pit, firstly pouring concrete into the tower crane foundation pit until the concrete is flush with the surface of the tower crane foundation pit, waiting for 10-20min, and pouring concrete into the steel sleeve before the concrete is not initially set in the tower crane foundation pit until the steel sleeve is filled with the concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010032454.2A CN111042185B (en) | 2020-01-13 | 2020-01-13 | Construction method of basement raft foundation with tower crane foundation |
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| CN202010032454.2A CN111042185B (en) | 2020-01-13 | 2020-01-13 | Construction method of basement raft foundation with tower crane foundation |
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| CN112049009B (en) * | 2020-08-13 | 2022-11-18 | 中铁大桥勘测设计院集团有限公司 | Shallow formula raft type anchorage that buries |
| CN112627226B (en) * | 2020-12-29 | 2022-11-25 | 江苏群星矿用机械有限公司 | Tower crane foundation structure |
| CN113510124A (en) * | 2021-06-18 | 2021-10-19 | 中国核电工程有限公司 | Self-rotating decontamination device at bottom of spent fuel assembly transport container |
| CN115233726A (en) * | 2022-07-29 | 2022-10-25 | 陕西建工第三建设集团有限公司 | Tower crane foundation construction method in deep mucky soil area |
| CN115467364A (en) * | 2022-09-19 | 2022-12-13 | 中建七局第四建筑有限公司 | Construction method of 0# block diaphragm beam tower crane foundation |
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