CN112813991A - Excavation and support construction method for deep foundation pit of subway transfer station - Google Patents
Excavation and support construction method for deep foundation pit of subway transfer station Download PDFInfo
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- CN112813991A CN112813991A CN202110011965.0A CN202110011965A CN112813991A CN 112813991 A CN112813991 A CN 112813991A CN 202110011965 A CN202110011965 A CN 202110011965A CN 112813991 A CN112813991 A CN 112813991A
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Abstract
The invention discloses a subway transfer station deep foundation pit excavation supporting construction method which adopts a diaphragm wall enclosure structure, a concrete support and a steel pipe combined support are arranged, the inner side concrete support forms an annular reinforced concrete support, a concrete support formwork adopts a prefabricated counter-pressure block counter-pressure easily-detachable formwork system and a stereotyped formwork system, a waist beam built-in segment section steel and the diaphragm wall enclosure structure are combined into a whole by anchoring and hanging, and a lattice column adopts a flexible anti-collision construction protection device. The construction steps comprise: (1) construction preparation, (2) drainage in a yard, (3) construction of a ground connecting wall, (4) binding of a concrete support and a waist beam reinforcement cage, (5) formwork support and a waist beam, (6) concrete pouring and maintenance, (7) formwork removal and foundation pit excavation, and (8) construction of a next layer of concrete support. The invention ensures the whole safety and stability of the foundation pit, greatly accelerates the construction speed and has obvious social benefit and economic benefit.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a deep foundation pit excavation supporting construction method for a subway transfer station.
Background
With the rapid development of urban rail transit, more and more cities begin to construct rail transit network frameworks consisting of a plurality of subway lines, the traffic must be converted between the lines through transfer, and a transfer station is used as a junction for converting the rail transit lines.
According to the traditional transfer station foundation pit construction, the transverse isolation piles are arranged at the node positions, according to the principle of depth from shallow to deep, stations with different depths are excavated in different zones, two layers of stations are excavated firstly, three layers of stations are excavated, and the isolation piles are removed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a subway transfer station deep foundation pit excavation supporting construction method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the excavation and support construction method for the deep foundation pit of the subway transfer station is characterized by comprising the following steps of: the method comprises the following steps:
(1) and construction preparation:
clearing measures are taken to ensure that the whole construction period meets the environmental protection requirement, whether the materials adopted in the engineering are qualified or not is confirmed, and relevant construction equipment is debugged;
(2) and water drainage in the field:
well doing the drainage work in the construction site, and ensuring to drain the water outside and in the pit of the construction site;
(3) and constructing the diaphragm wall:
the method comprises the steps of positioning the diaphragm wall on a soil body (15) to be excavated of a foundation pit in a construction site, enabling the positioned diaphragm wall to be constructed to form a cross shape, constructing the diaphragm wall (1) according to the positioning position to form a cross diaphragm wall enclosure structure, embedding anchor-hanging steel bars (7) in diaphragm walls on two sides of each cross arm of the diaphragm wall enclosure structure, close to a cross-shaped central area, and enabling the anchor-hanging steel bars (7) to extend out of the diaphragm wall and incline downwards;
(4) concrete support and waist beam reinforcement cage binding:
respectively constructing inner concrete supports (4) on a foundation pit soil body to be excavated (15) at the position of a communication opening between each cross arm of the underground diaphragm wall enclosure structure and a cross-shaped central area, and respectively constructing outer concrete supports (5) on the foundation pit soil body to be excavated (15) at the position close to the inner concrete supports (4) in each cross arm; concrete diagonal braces (6) are respectively constructed on a foundation pit soil body (15) to be excavated between the inner side concrete brace (4) and the outer side concrete brace (5) in each cross arm, and the inner side concrete brace (4) and the outer side concrete brace (5) are connected by the concrete diagonal braces (6); a waist beam (3) which is tightly attached to a corresponding side ground connecting wall is respectively constructed on a foundation pit soil body (15) between the end parts of the inner side concrete support (4) and the outer side concrete support (5) in each cross arm in the same direction, the end parts of the inner side concrete support (4) and the outer side concrete support (5) are connected by the waist beam (3), section steel bars (25) are arranged in the waist beam (3), the waist beam (3) is positioned below anchor-hanging steel bars (7) which are pre-embedded in the corresponding side ground connecting wall, and the section steel bars (25) arranged in each waist beam (3) are respectively welded with the anchor-hanging steel bars (7) which are pre-embedded in the corresponding side ground connecting wall; one end of the inner concrete support (4) and one end of the outer concrete support (5) in the same direction in each cross arm are respectively provided with a lattice column (10), the lower end of each lattice column (10) is embedded into the concrete support, and the upper end of each lattice column (10) extends upwards;
(5) concrete support, waist rail (3) formwork:
the steel templates (11) are respectively and closely mounted on the inner side surface and the outer side surface of the inner side concrete support (4), the inner side surface and the outer side surface of the outer side concrete support (5), the inner side surface and the outer side surface of the waist beam (3) and two side surfaces of the concrete inclined supports (6) in each cross arm; and the outer side of the inner side concrete support (4) and the outer side of the outer side concrete support (5) in each cross arm are respectively provided with a prefabricated counter-pressure block counter-pressure easily-disassembled formwork system, and the inner side of the inner side concrete support (4), the inner side of the outer side concrete support (5), the inner side of the waist beam (3) and the two sides of the concrete inclined support (6) in each cross arm are respectively provided with a shaped formwork system, wherein:
the prefabricated counter-pressure easily-disassembled template system comprises prefabricated counter-pressure blocks (9) fixed on a foundation pit soil body (15) to be excavated outside an inner concrete support (4) and outside an outer concrete support (5), gaps are respectively arranged between the inner concrete support (4) and the corresponding prefabricated counter-pressure block (9) and between the outer concrete support (5) and the corresponding prefabricated counter-pressure block (9), a base (16) is respectively fixed on the foundation pit soil body (15) to be excavated corresponding to each gap position, the lower part of a steel template on the outer side surface of the inner concrete support (4) and the lower part of a steel template on the outer side surface of the outer concrete support (5) are respectively connected with the bases (16) in the respective corresponding gaps, the inner concrete support (4) is connected with the corresponding prefabricated counter-pressure block (9), and the outer concrete support (5) is connected with the corresponding prefabricated counter-pressure block (9) through adjustable support rods (8), thus forming a back pressure block back pressure easily-detachable template system respectively;
each stereotyped formwork system comprises a plurality of L-shaped supports (13), the vertical parts of all L-shaped supports (13) on the inner side of an inner concrete support (4) are connected with the inner concrete support (4) through detachable connecting screw rods (19) and nuts (18) respectively, the vertical parts of all L-shaped supports on the inner side of an outer concrete support (5) are connected with the outer concrete support (5) through detachable connecting screw rods and nuts respectively, the vertical parts of all L-shaped supports on the inner side of a waist beam (3) are connected with the waist beam (3) through detachable connecting screw rods and nuts respectively, the vertical parts of all L-shaped supports on the two sides of a concrete inclined support (6) are connected with the corresponding sides of the concrete inclined support (6) through detachable connecting screw rods and nuts respectively, the horizontal part of each L-shaped support (13) is fixed on a foundation pit soil body (15) to be excavated through a steel chisel, and the horizontal part of each L-shaped support (13), Inclined support rods (12) are fixedly connected between the vertical parts to form a triangular bracket, so that a shaped formwork supporting system is formed;
(6) pouring and maintaining concrete:
after the formwork is erected according to the step (5), watering and curing are carried out on the concrete of each part;
(7) removing the formwork and excavating the foundation pit:
firstly, dismantling a shaped formwork supporting system and a prefabricated counter-pressure block back-pressure easily-dismantled formwork system, and then respectively hoisting a plurality of steel pipe supports (2) into each cross arm, so that two ends of each hoisted steel pipe support (2) are respectively supported on the ground connecting walls (1) on two sides of the cross arm; then, steel wire meshes (26) are arranged around each lattice column (10), and a certain gap is formed between each steel wire mesh (26) and each lattice column (10), so that the collision of excavating machinery to each lattice column (10) during foundation pit excavation is effectively prevented;
then integrally and hierarchically excavating earthwork at the transfer node position, wherein an unearthed channel is arranged on one side during excavation, and other three sides are excavated by adopting a backward ramp normal node position, so that the stability of a foundation pit and the smoothness of the unearthed channel at each construction stage can be ensured under the complex condition that four sides of the node position are excavated simultaneously;
(8) and (5) after one-layer construction is finished according to the steps (3) to (7), repeating the steps (3) to (7) to carry out the next-layer construction.
The excavation and support construction method for the deep foundation pit of the subway transfer station is characterized by comprising the following steps of: and (3) after the ground connection wall is positioned, binding reinforcement cages into grooves on site, hoisting the bound reinforcement cages to each ground connection wall positioning position respectively, pouring concrete, constructing according to the positioning positions to obtain the ground connection wall (1), and enclosing the ground connection wall (1) into a cross ground connection wall maintenance structure.
The excavation and support construction method for the deep foundation pit of the subway transfer station is characterized by comprising the following steps of: in the step (4), the inner side concrete support (4), the outer side concrete support (5), the concrete inclined support (6) and the waist beam (3) are formed in a mode that concrete is poured after the reinforcement cage is bound and installed on site.
The excavation and support construction method for the deep foundation pit of the subway transfer station is characterized by comprising the following steps of: in the prefabricated counter-pressure block back-pressure easily-disassembled template system in the step (5), each base (16) is fixed in a gap through a steel chisel (14) which penetrates through the base (16) and is driven into a foundation pit soil body (15) to be excavated, the outer surface of a steel template on the outer side of the inner concrete support (4) and the outer surface of a steel template on the outer side of the outer concrete support (5) are respectively and tightly fixed with a stand column (20), one end, facing the inner concrete support (4), of the base (16) corresponding to the inner concrete support (4) and one end, facing the outer concrete support (5), of the base corresponding to the outer concrete support (5) are respectively upwards tilted to form upwards-tilted parts, and the upwards-tilted parts are respectively connected with the stand columns (20) through fixing screws (17);
adjustable vaulting pole (8) are including sleeve (22), two threaded rods (21), two steel cushion blocks (23) respectively, and sleeve (22) both ends nozzle is gone into to the respective one end of two threaded rods (21) screw respectively, and one of them steel cushion block (23) are fixed in prefabricated backpressure piece (9) that correspond, and another steel cushion block is fixed in stand (20), and two steel cushion blocks (23) are connected to two threaded rods (21) other end one-to-one, through the length of adjusting sleeve (22) adjustable vaulting pole (8).
The excavation and support construction method for the deep foundation pit of the subway transfer station is characterized by comprising the following steps of: in the step (7), a plurality of U-shaped steel plates (27) are pre-embedded in positions, embedded into the latticed column (10), of the top surfaces of the inner side concrete support (4) and the outer side concrete support (5) in each cross arm, the lower portion of each U-shaped steel plate (27) is welded with a T-shaped steel bar (28) respectively, the T-shaped steel bars (28) penetrate into the inner side concrete support (4) or the outer side concrete support (5) at the positions and are welded with a steel reinforcement cage forming the inner side concrete support (4) or the outer side concrete support (5) into a whole, each U-shaped steel plate (27) is provided with a reserved hole (29), and each U-shaped steel plate (27) is fixedly connected with a steel wire mesh (26) surrounding the corresponding latticed column (10) through a connecting screw penetrating through the reserved hole (29) respectively.
Compared with the prior art, the invention has the advantages that:
1. the invention adopts the annular reinforced concrete support, not only ensures the whole safety and stability of the foundation pit, but also can cancel the design of the traditional transfer three-layer station position transverse isolation pile, the earthwork at the transfer node position is integrally dug in layers, the unearthed channel is arranged on one side, the other three sides are dug by adopting the backward ramp normal direction node position, and the stability of the foundation pit and the smoothness of the unearthed channel at each construction stage can be ensured under the complex condition of simultaneously digging the four sides at the node position.
2. The annular reinforced concrete support waist beam is connected with the enclosure structure in an anchor-hanging combined mode, so that the suspended support is safe and reliable, the force transmission is balanced, the later support removal is facilitated, the foundation pits of stations at different depths of a transfer station can be synchronously excavated by adopting reliable support measures and a reasonable excavation mode, and the construction speed is greatly increased.
3. The invention adopts the modular formwork system and the prefabricated counter-pressure block back-pressure easily-disassembled formwork system and other assembled components, has high installation speed and high construction efficiency, can be repeatedly used, and reduces the construction cost.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention.
Fig. 2 is a schematic plane view of excavation and support of a deep foundation pit of a subway transfer station.
Fig. 3 is a schematic diagram of the support of a deep foundation pit excavation supporting concrete supporting template of a subway transfer station.
Fig. 4 is a schematic cross-sectional view of the inner concrete supporting form.
Fig. 5 is a schematic view of anchor-hanging combination of diaphragm wall and wale.
Fig. 6 is a schematic view of a lattice column compliant bumper.
FIG. 7 is a schematic view of a U-shaped steel plate.
The notation in the figure is: 1-diaphragm wall, 2-steel pipe support, 3-wale, 4-inner side concrete support, 5-outer side concrete support, 6-concrete diagonal support, 7-anchor-hanging steel bar, 8-adjustable support rod, 9-prefabricated counter-pressure block, 10-lattice column, 11-steel template, 12-diagonal support rod, 13-L-shaped support, 14-steel chisel, 15-foundation pit soil body to be excavated, 16-base, 17-fixing screw rod, 18-nut, 19-detachable connecting screw rod, 20-upright post, 21-threaded rod, 22-sleeve, 23-steel cushion block, 24-steel bar cage, 25-stage steel bar, 26-steel wire mesh, 27-U-shaped steel plate, 28-T-shaped steel bar and 29-reserved hole.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, the excavation and support construction method for the deep foundation pit of the subway transfer station comprises the following steps:
(1) and construction preparation:
cleaning measures of construction waste water and engineering waste are taken to ensure that the whole construction period meets the environmental protection requirement, whether materials such as sand, cement, stones and the like adopted in the engineering are qualified is confirmed through sampling inspection, and relevant construction equipment is debugged;
(2) and water drainage in the field:
well doing the drainage work in the construction site, and ensuring to drain the water outside and in the pit of the construction site;
(3) and constructing the diaphragm wall:
the method comprises the steps of positioning the diaphragm walls on a soil body 15 to be excavated of a foundation pit in a construction site, enabling the positioned diaphragm walls to be constructed to form a cross shape, constructing the diaphragm walls 1 according to the positioning position to form a cross diaphragm wall enclosure structure as shown in figure 2, embedding anchor-hanging steel bars 7 in the diaphragm walls on two sides of each cross arm of the diaphragm wall enclosure structure, close to a cross-shaped central area, respectively, and enabling the anchor-hanging steel bars 7 to extend out of the diaphragm walls and incline downwards;
(4) concrete support and waist beam reinforcement cage binding:
as shown in fig. 2, 3 and 5, respectively constructing inner concrete supports 4 on the soil body 15 to be excavated of the foundation pit at the position of the communication port between each cross arm of the underground diaphragm wall enclosure structure and the cross-shaped central area, and respectively constructing outer concrete supports 5 on the soil body 15 to be excavated of the foundation pit at the position close to the inner concrete supports 4 in each cross arm; a concrete diagonal brace 6 is respectively constructed on a foundation pit soil body to be excavated 15 between the inner side concrete support 4 and the outer side concrete support 5 in each cross arm, and the inner side concrete support 4 and the outer side concrete support 5 are connected by the concrete diagonal brace 6; a waist beam 3 which is tightly attached to a corresponding side underground diaphragm wall is respectively constructed on a foundation pit soil body 15 between the end parts of the inner side concrete support 4 and the outer side concrete support 5 in the same direction in each cross arm, the end parts of the inner side concrete support 4 and the outer side concrete support 5 are connected by the waist beam 3, section steel bars 25 are arranged in the waist beam 3, the position of the waist beam 3 corresponds to the lower part of an anchor-hanging reinforcing steel bar 7 pre-embedded in the side underground diaphragm wall, and the section steel bar 25 arranged in each waist beam 3 is respectively welded with the anchor-hanging reinforcing steel bar 7 pre-embedded in the corresponding side underground diaphragm wall; one end of the inner concrete support 4 and one end of the outer concrete support 5 in the same direction in each cross arm are respectively provided with a lattice column 10, the lower end of the lattice column 10 is embedded into the concrete support, and the upper end of the lattice column 10 extends upwards;
(5) concrete support, 3 formworks of waist rail:
as shown in fig. 2, 3 and 4, a steel formwork 11 is respectively closely mounted on the inner side surface and the outer side surface of the inner concrete support 4, the inner side surface and the outer side surface of the outer concrete support 5, the inner side surface and the outer side surface of the waist rail 3 and two side surfaces of the concrete inclined supports 6 in each cross arm; and the outer side of the inner side concrete support 4 and the outer side of the outer side concrete support 5 in each cross arm are respectively provided with a prefabricated counter-pressure block counter-pressure easily-detachable formwork system, and the inner side of the inner side concrete support 4, the inner side of the outer side concrete support 5, the inner side of the waist beam 3 and the two sides of the concrete inclined support 6 in each cross arm are respectively provided with a shaped formwork system, wherein:
the prefabricated counter-pressure easily-disassembled template system comprises prefabricated counter-pressure blocks 9 fixed outside an inner concrete support 4 and on a foundation pit soil body 15 to be excavated outside an outer concrete support 5, gaps are respectively reserved between the inner concrete support 4 and the corresponding prefabricated counter-pressure block 9 and between the outer concrete support 5 and the corresponding prefabricated counter-pressure block 9, a base 16 is respectively fixed on the foundation pit soil body 15 to be excavated corresponding to each gap, the lower part of a steel template on the outer side surface of the inner concrete support 4 and the lower part of the steel template on the outer side surface of the outer concrete support 5 are respectively connected with the bases 16 in the respective corresponding gaps, the inner concrete support 4 and the corresponding prefabricated counter-pressure block 9 and the lower part of the outer concrete support 5 and the corresponding prefabricated counter-pressure block 9 are respectively connected through adjustable support rods 8, and therefore counter-pressure block easily-disassembled template systems are respectively formed;
each stereotyped formwork system comprises a plurality of L-shaped supports 13, each L-shaped support 13 inside the inner concrete support 4 is connected with the inner concrete support 4 through a detachable connecting screw rod 19 and a nut 18, each L-shaped support vertical part inside the outer concrete support 5 is connected with the outer concrete support 5 through a detachable connecting screw rod and a nut, each L-shaped support vertical part inside the waist beam 3 is connected with the waist beam 3 through a detachable connecting screw rod and a nut, each L-shaped support vertical part on two sides of the concrete inclined support 6 is connected with the corresponding side of the concrete inclined support 6 through a detachable connecting screw rod and a nut, the horizontal part of each L-shaped support 13 is fixed on the foundation pit excavation soil body 15 through a steel chisel, and inclined support rods 12 are fixedly connected between the horizontal part and the vertical part of each L-shaped support 13 to form a triangular support, thus forming a shaped formwork system respectively;
(6) pouring and maintaining concrete:
after the formwork is erected according to the step 5, watering and curing are carried out on the concrete of each part;
(7) removing the formwork and excavating the foundation pit:
firstly, dismantling a shaped formwork supporting system and a prefabricated counter-pressure block back-pressure easily-dismantled formwork system, and then respectively hoisting a plurality of steel pipe supports 2 into each cross arm, so that two ends of each hoisted steel pipe support 2 are respectively supported on the ground connecting walls 1 on two sides of the cross arm; then, the steel wire mesh 26 is arranged around each lattice column 10 in an enclosing mode, a certain gap is formed between each steel wire mesh 26 and each lattice column 10, and therefore the collision of excavating machinery to each lattice column 10 during foundation pit excavation is effectively prevented;
then integrally and hierarchically excavating earthwork at the transfer node position, wherein an unearthed channel is arranged on one side during excavation, and other three sides are excavated by adopting a backward ramp normal node position, so that the stability of a foundation pit and the smoothness of the unearthed channel at each construction stage can be ensured under the complex condition that four sides of the node position are excavated simultaneously;
(8) and (5) after one-layer construction is finished according to the steps (3) to (7), repeating the steps (3) to (7) to carry out the next-layer construction.
And (3) after the ground connection wall is positioned, binding reinforcement cages into grooves on site, hoisting the bound reinforcement cages to each ground connection wall positioning position respectively, and pouring concrete, so that the ground connection wall 1 is obtained by construction according to the positioning positions, and the ground connection wall 1 is surrounded into a cross-shaped ground connection wall maintenance structure.
In the step (4), the inner side concrete support 4, the outer side concrete support 5, the concrete diagonal support 6 and the waist beam 3 are formed in a mode of pouring concrete after being bound and installed by the on-site reinforcement cage 24.
As shown in fig. 4, in the prefabricated counter-pressure block back-pressure easily-disassembled formwork system in the step (5), each base 16 is fixed in a gap by a steel chisel 14 which penetrates through the base 16 and is driven into a soil body 15 to be excavated in a foundation pit, the outer surface of the steel formwork outside the inner concrete support 4 and the outer surface of the steel formwork outside the outer concrete support 5 are respectively and tightly fixed with an upright post 20, one end, facing the inner concrete support 4, of the base 16 corresponding to the inner concrete support 4 and one end, facing the outer concrete support 5, of the base corresponding to the outer concrete support 5 are respectively upturned to form an upturned part, and the upturned parts are respectively connected with the upright posts 20 through fixing screws 17;
the adjustable stay bar 8 comprises a sleeve 22, two threaded rods 21 and two steel cushion blocks 23, one end of each of the two threaded rods 21 is screwed into a barrel mouth at two ends of the sleeve 22, one steel cushion block 23 is fixed on the corresponding prefabricated counter-pressing block 9, the other steel cushion block is fixed on the stand column 20, the other ends of the two threaded rods 21 are connected with the two steel cushion blocks 23 in a one-to-one correspondence mode, and the length of the adjustable stay bar 8 can be adjusted through the adjusting sleeve 22.
As shown in fig. 6 and 7, in the step (7), a plurality of U-shaped steel plates 27 are respectively embedded in the top surfaces of the inner concrete support 4 and the outer concrete support 5 in each cross arm around the embedded position of the lattice column 10, a T-shaped steel bar 28 is respectively welded to the lower portion of each U-shaped steel plate 27, the T-shaped steel bar 28 is inserted into the inner concrete support 4 or the outer concrete support 5 where the T-shaped steel bar 28 is located and welded to a steel reinforcement cage forming the inner concrete support 4 or the outer concrete support 5, each U-shaped steel plate 27 is provided with a reserved hole 29, and each U-shaped steel plate 27 is respectively and fixedly connected with a steel wire mesh 26 surrounding the corresponding lattice column 10 through a connecting screw rod penetrating through the reserved hole 29.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (5)
1. The excavation and support construction method for the deep foundation pit of the subway transfer station is characterized by comprising the following steps of: the method comprises the following steps:
(1) and construction preparation:
clearing measures are taken to ensure that the whole construction period meets the environmental protection requirement, whether the materials adopted in the engineering are qualified or not is confirmed, and relevant construction equipment is debugged;
(2) and water drainage in the field:
well doing the drainage work in the construction site, and ensuring to drain the water outside and in the pit of the construction site;
(3) and constructing the diaphragm wall:
the method comprises the steps of positioning the diaphragm wall on a soil body (15) to be excavated of a foundation pit in a construction site, enabling the positioned diaphragm wall to be constructed to form a cross shape, constructing the diaphragm wall (1) according to the positioning position to form a cross diaphragm wall enclosure structure, embedding anchor-hanging steel bars (7) in diaphragm walls on two sides of each cross arm of the diaphragm wall enclosure structure, close to a cross-shaped central area, and enabling the anchor-hanging steel bars (7) to extend out of the diaphragm wall and incline downwards;
(4) concrete support and waist beam reinforcement cage binding:
respectively constructing inner concrete supports (4) on a foundation pit soil body to be excavated (15) at the position of a communication opening between each cross arm of the underground diaphragm wall enclosure structure and a cross-shaped central area, and respectively constructing outer concrete supports (5) on the foundation pit soil body to be excavated (15) at the position close to the inner concrete supports (4) in each cross arm; concrete diagonal braces (6) are respectively constructed on a foundation pit soil body (15) to be excavated between the inner side concrete brace (4) and the outer side concrete brace (5) in each cross arm, and the inner side concrete brace (4) and the outer side concrete brace (5) are connected by the concrete diagonal braces (6); a waist beam (3) which is tightly attached to a corresponding side ground connecting wall is respectively constructed on a foundation pit soil body (15) between the end parts of the inner side concrete support (4) and the outer side concrete support (5) in each cross arm in the same direction, the end parts of the inner side concrete support (4) and the outer side concrete support (5) are connected by the waist beam (3), section steel bars (25) are arranged in the waist beam (3), the waist beam (3) is positioned below anchor-hanging steel bars (7) which are pre-embedded in the corresponding side ground connecting wall, and the section steel bars (25) arranged in each waist beam (3) are respectively welded with the anchor-hanging steel bars (7) which are pre-embedded in the corresponding side ground connecting wall; one end of the inner concrete support (4) and one end of the outer concrete support (5) in the same direction in each cross arm are respectively provided with a lattice column (10), the lower end of each lattice column (10) is embedded into the concrete support, and the upper end of each lattice column (10) extends upwards;
(5) concrete support, waist rail (3) formwork:
the steel templates (11) are respectively and closely mounted on the inner side surface and the outer side surface of the inner side concrete support (4), the inner side surface and the outer side surface of the outer side concrete support (5), the inner side surface and the outer side surface of the waist beam (3) and two side surfaces of the concrete inclined supports (6) in each cross arm; and the outer side of the inner side concrete support (4) and the outer side of the outer side concrete support (5) in each cross arm are respectively provided with a prefabricated counter-pressure block counter-pressure easily-disassembled formwork system, and the inner side of the inner side concrete support (4), the inner side of the outer side concrete support (5), the inner side of the waist beam (3) and the two sides of the concrete inclined support (6) in each cross arm are respectively provided with a shaped formwork system, wherein:
the prefabricated counter-pressure easily-disassembled template system comprises prefabricated counter-pressure blocks (9) fixed on a foundation pit soil body (15) to be excavated outside an inner concrete support (4) and outside an outer concrete support (5), gaps are respectively arranged between the inner concrete support (4) and the corresponding prefabricated counter-pressure block (9) and between the outer concrete support (5) and the corresponding prefabricated counter-pressure block (9), a base (16) is respectively fixed on the foundation pit soil body (15) to be excavated corresponding to each gap position, the lower part of a steel template on the outer side surface of the inner concrete support (4) and the lower part of a steel template on the outer side surface of the outer concrete support (5) are respectively connected with the bases (16) in the respective corresponding gaps, the inner concrete support (4) is connected with the corresponding prefabricated counter-pressure block (9), and the outer concrete support (5) is connected with the corresponding prefabricated counter-pressure block (9) through adjustable support rods (8), thus forming a back pressure block back pressure easily-detachable template system respectively;
each stereotyped formwork system comprises a plurality of L-shaped supports (13), the vertical parts of all L-shaped supports (13) on the inner side of an inner concrete support (4) are connected with the inner concrete support (4) through detachable connecting screw rods (19) and nuts (18) respectively, the vertical parts of all L-shaped supports on the inner side of an outer concrete support (5) are connected with the outer concrete support (5) through detachable connecting screw rods and nuts respectively, the vertical parts of all L-shaped supports on the inner side of a waist beam (3) are connected with the waist beam (3) through detachable connecting screw rods and nuts respectively, the vertical parts of all L-shaped supports on the two sides of a concrete inclined support (6) are connected with the corresponding sides of the concrete inclined support (6) through detachable connecting screw rods and nuts respectively, the horizontal part of each L-shaped support (13) is fixed on a foundation pit soil body (15) to be excavated through a steel chisel, and the horizontal part of each L-shaped support (13), Inclined support rods (12) are fixedly connected between the vertical parts to form a triangular bracket, so that a shaped formwork supporting system is formed;
(6) pouring and maintaining concrete:
after the formwork is erected according to the step (5), watering and curing are carried out on the concrete of each part;
(7) removing the formwork and excavating the foundation pit:
firstly, dismantling a shaped formwork supporting system and a prefabricated counter-pressure block back-pressure easily-dismantled formwork system, and then respectively hoisting a plurality of steel pipe supports (2) into each cross arm, so that two ends of each hoisted steel pipe support (2) are respectively supported on the ground connecting walls (1) on two sides of the cross arm; then, steel wire meshes (26) are arranged around each lattice column (10), and a certain gap is formed between each steel wire mesh (26) and each lattice column (10), so that the collision of excavating machinery to each lattice column (10) during foundation pit excavation is effectively prevented;
then integrally and hierarchically excavating earthwork at the transfer node position, wherein an unearthed channel is arranged on one side during excavation, and other three sides are excavated by adopting a backward ramp normal node position, so that the stability of a foundation pit and the smoothness of the unearthed channel at each construction stage can be ensured under the complex condition that four sides of the node position are excavated simultaneously;
(8) and (5) after one-layer construction is finished according to the steps (3) to (7), repeating the steps (3) to (7) to carry out the next-layer construction.
2. The excavation and support construction method for the deep foundation pit of the subway transfer station as claimed in claim 1, wherein: and (3) after the ground connection wall is positioned, binding reinforcement cages into grooves on site, hoisting the bound reinforcement cages to each ground connection wall positioning position respectively, pouring concrete, constructing according to the positioning positions to obtain the ground connection wall (1), and enclosing the ground connection wall (1) into a cross ground connection wall maintenance structure.
3. The excavation and support construction method for the deep foundation pit of the subway transfer station as claimed in claim 1, wherein: in the step (4), the inner side concrete support (4), the outer side concrete support (5), the concrete inclined support (6) and the waist beam (3) are formed in a mode that concrete is poured after the reinforcement cage is bound and installed on site.
4. The excavation and support construction method for the deep foundation pit of the subway transfer station as claimed in claim 1, wherein: in the prefabricated counter-pressure block back-pressure easily-disassembled template system in the step (5), each base (16) is fixed in a gap through a steel chisel (14) which penetrates through the base (16) and is driven into a foundation pit soil body (15) to be excavated, the outer surface of a steel template on the outer side of the inner concrete support (4) and the outer surface of a steel template on the outer side of the outer concrete support (5) are respectively and tightly fixed with a stand column (20), one end, facing the inner concrete support (4), of the base (16) corresponding to the inner concrete support (4) and one end, facing the outer concrete support (5), of the base corresponding to the outer concrete support (5) are respectively upwards tilted to form upwards-tilted parts, and the upwards-tilted parts are respectively connected with the stand columns (20) through fixing screws (17);
adjustable vaulting pole (8) are including sleeve (22), two threaded rods (21), two steel cushion blocks (23) respectively, and sleeve (22) both ends nozzle is gone into to the respective one end of two threaded rods (21) screw respectively, and one of them steel cushion block (23) are fixed in prefabricated backpressure piece (9) that correspond, and another steel cushion block is fixed in stand (20), and two steel cushion blocks (23) are connected to two threaded rods (21) other end one-to-one, through the length of adjusting sleeve (22) adjustable vaulting pole (8).
5. The excavation and support construction method for the deep foundation pit of the subway transfer station as claimed in claim 1 or 3, wherein: in the step (7), a plurality of U-shaped steel plates (27) are pre-embedded in positions, embedded into the latticed column (10), of the top surfaces of the inner side concrete support (4) and the outer side concrete support (5) in each cross arm, the lower portion of each U-shaped steel plate (27) is welded with a T-shaped steel bar (28) respectively, the T-shaped steel bars (28) penetrate into the inner side concrete support (4) or the outer side concrete support (5) at the positions and are welded with a steel reinforcement cage forming the inner side concrete support (4) or the outer side concrete support (5) into a whole, each U-shaped steel plate (27) is provided with a reserved hole (29), and each U-shaped steel plate (27) is fixedly connected with a steel wire mesh (26) surrounding the corresponding latticed column (10) through a connecting screw penetrating through the reserved hole (29) respectively.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802722A (en) * | 2021-09-23 | 2021-12-17 | 武汉建工集团股份有限公司 | Construction method for recyclable deep foundation pit and outer wall integrated structure |
| CN114016516A (en) * | 2021-11-08 | 2022-02-08 | 贵州建工集团第一建筑工程有限责任公司 | Concrete-steel structure mixed angle brace construction method |
| CN114197476A (en) * | 2021-11-16 | 2022-03-18 | 中铁四局集团第四工程有限公司 | Square support construction method for deep foundation pit of urban railway underground station transfer section |
| CN114263188A (en) * | 2021-12-30 | 2022-04-01 | 上海市机械施工集团有限公司 | Double-support platform structure for foundation pit engineering and construction method |
| CN115075573A (en) * | 2022-08-02 | 2022-09-20 | 中国建筑西北设计研究院有限公司 | Construction method for reinforcing axil node of steel reinforced concrete wall beam |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11181805A (en) * | 1997-12-25 | 1999-07-06 | Ohbayashi Corp | Building method for underground structure |
| CN102767162A (en) * | 2012-07-03 | 2012-11-07 | 中国葛洲坝集团股份有限公司 | Concrete double-bracing large-scale mold plate and form stripping and form erecting methods |
| CN104404963A (en) * | 2014-10-10 | 2015-03-11 | 中国建筑第六工程局有限公司 | Cross construction method for deep foundation pits in metro interchange station |
| CN211898419U (en) * | 2019-12-23 | 2020-11-10 | 中国二十冶集团有限公司 | Protection architecture of lattice column in excavation supporting construction process |
-
2021
- 2021-01-06 CN CN202110011965.0A patent/CN112813991A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11181805A (en) * | 1997-12-25 | 1999-07-06 | Ohbayashi Corp | Building method for underground structure |
| CN102767162A (en) * | 2012-07-03 | 2012-11-07 | 中国葛洲坝集团股份有限公司 | Concrete double-bracing large-scale mold plate and form stripping and form erecting methods |
| CN104404963A (en) * | 2014-10-10 | 2015-03-11 | 中国建筑第六工程局有限公司 | Cross construction method for deep foundation pits in metro interchange station |
| CN211898419U (en) * | 2019-12-23 | 2020-11-10 | 中国二十冶集团有限公司 | Protection architecture of lattice column in excavation supporting construction process |
Non-Patent Citations (2)
| Title |
|---|
| 杨德春等: "地铁换乘基坑环框支撑结构关键技术分析", 《隧道建设（中英文）》 * |
| 梁亚华等: "地铁换乘车站复杂深基坑土方开挖技术研究", 《建筑施工》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802722A (en) * | 2021-09-23 | 2021-12-17 | 武汉建工集团股份有限公司 | Construction method for recyclable deep foundation pit and outer wall integrated structure |
| CN113802722B (en) * | 2021-09-23 | 2022-09-06 | 武汉建工集团股份有限公司 | Construction method for recyclable deep foundation pit and outer wall integrated structure |
| CN114016516A (en) * | 2021-11-08 | 2022-02-08 | 贵州建工集团第一建筑工程有限责任公司 | Concrete-steel structure mixed angle brace construction method |
| CN114197476A (en) * | 2021-11-16 | 2022-03-18 | 中铁四局集团第四工程有限公司 | Square support construction method for deep foundation pit of urban railway underground station transfer section |
| CN114197476B (en) * | 2021-11-16 | 2024-01-23 | 中铁四局集团第四工程有限公司 | Construction method for deep foundation pit-mouth-shaped support of transfer section of urban railway underground station |
| CN114263188A (en) * | 2021-12-30 | 2022-04-01 | 上海市机械施工集团有限公司 | Double-support platform structure for foundation pit engineering and construction method |
| CN115075573A (en) * | 2022-08-02 | 2022-09-20 | 中国建筑西北设计研究院有限公司 | Construction method for reinforcing axil node of steel reinforced concrete wall beam |
| CN115075573B (en) * | 2022-08-02 | 2024-02-06 | 中国建筑西北设计研究院有限公司 | Construction method for haunching of oblique joints of section steel concrete wall beams |
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