CN114059554B - Deep foundation pit inner support system with steel truss and inclined cast support and construction method - Google Patents
Deep foundation pit inner support system with steel truss and inclined cast support and construction method Download PDFInfo
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- CN114059554B CN114059554B CN202111499010.0A CN202111499010A CN114059554B CN 114059554 B CN114059554 B CN 114059554B CN 202111499010 A CN202111499010 A CN 202111499010A CN 114059554 B CN114059554 B CN 114059554B
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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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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to the technical field of foundation pit support, in particular to a deep foundation pit inner support system with a steel truss and an inclined cast support and a construction method. The deep foundation pit inner support system with the steel truss and the inclined cast support comprises: the supporting pile comprises a pair of supporting pile modules, a plurality of steel truss modules, a plurality of inclined throwing support assemblies and a plurality of groups of tie bars. Two ends of the steel truss module are correspondingly connected with the top ends of the paired supporting pile modules one by one; the top of the inclined cast support component supports the side wall of the supporting pile module; the tie bars are vertically connected with the plurality of steel truss modules, and the tie bars, the support pile modules, the steel truss modules and the inclined cast-strut assemblies form a space stress system. Various components of the invention can be prefabricated, and the invention has the advantages of high construction efficiency, repeated utilization and the like; the vertical columns and the vertical column piles can be omitted in the pit, soil disturbance to the bottom of the foundation pit is avoided, the water leakage risk of bottom plate construction is reduced, and the foundation pit construction method is suitable for foundation pit engineering with tight construction period and high requirement on a foundation construction working surface.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a deep foundation pit inner support system with a steel truss and an inclined cast support and a construction method.
Background
The rapid development of economy of modern society also leads to the problems of road traffic congestion and the like, so people develop underground traffic to reduce the pressure caused by the road traffic congestion. With the development of underground main structures such as deep basements and subway stations, foundation pit support is required to protect the safety of construction and the surrounding environment of the foundation pit. When a foundation pit is close to sensitive and important protected objects such as buildings, underground pipelines, subway facilities and the like, a supporting structure often cannot exceed a building red line, a supporting form of a supporting pile combined with an inner supporting system is generally adopted, and for the foundation pit with a deeper depth, a plurality of inner supports are often required to be arranged, so that the construction space in the foundation pit is limited. Traditional interior support adopts reinforced concrete material more, must reach certain intensity after can carry out next soil body excavation, construction cycle is longer relatively, and work load is big, the speed is slow when the support is demolishd moreover, still will produce a large amount of building rubbish after demolishing, pollutes the ecological environment. Meanwhile, in order to ensure the longitudinal stability of the cast-in-place concrete horizontal support, strengthen the space rigidity of the support and bear the vertical load transmitted by the horizontal support, columns and upright piles are required to be arranged, so that the construction operation surface in the foundation pit is narrow, and the foundation of the upright piles remained in the soil body is an obstacle difficult to remove; the position of the added stand column needs to be reserved with holes when the bottom plate concrete is poured, and hidden danger is left for water prevention of the underground main body structure.
Disclosure of Invention
Technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a deep foundation pit inner support system with a steel truss and an inclined cast support and a construction method, which solve the problem that the construction working face is too small due to an upright column and an upright column pile arranged in a foundation pit.
(II) technical scheme
In order to achieve the purpose, the deep foundation pit inner support system of the strip steel truss and the inclined cast support comprises:
pairs of fender pile modules;
the two ends of the steel truss modules are correspondingly connected with the top ends of the paired supporting pile modules one by one;
the top of the inclined throwing support assembly supports the side wall of the supporting pile module;
the tie bars, the supporting pile modules, the steel truss modules and the inclined cast bracing assembly form a space stress system.
Optionally, the steel truss module comprises a first chord member assembly, a first standard unit body of the steel truss, a third standard unit body of the steel truss, a second standard unit body of the steel truss and a second chord member assembly which are sequentially detachably connected from left to right through flange plates, the third standard unit body of the steel truss is arranged at the central position of the steel truss module, and the left end of the first chord member assembly and the right end of the second chord member assembly are respectively connected with the corresponding supporting pile modules.
Optionally, the steel truss module all includes lower chord, upper chord and web member, the upper end of web member with the upper chord is connected, the lower extreme of web member with the lower chord is connected, the left end of the upper chord of first chord subassembly with the right-hand member of the upper chord of second chord subassembly all is provided with downwardly extending's montant, the montant perpendicular to the lower chord, the lower chord the upper chord the web member with the montant is square steel pipe.
Optionally, the lower end of the vertical rod is fixedly connected with a first steel base plate, the upper end of the supporting pile module is fixedly connected with a second steel base plate, and the first steel base plate is detachably connected with the second steel base plate.
Optionally, the supporting pile module is provided with a plurality of third steel tie plates; the left end of the lower chord of the first chord component is connected with a first loose end socket, and the other end of the first loose end socket is detachably connected with the corresponding third steel base plate; the right end of the lower chord of the second chord component is connected with a fixed end head, and the other end of the fixed end head is detachably connected with the corresponding third steel base plate; and a first jack is arranged in the first movable end.
Optionally, the supporting pile module comprises a supporting pile, a waist beam and a crown beam, the waist beam is cast on the side wall of the supporting pile, the crown beam is cast on the top end of the supporting pile, the top end of the crown beam is fixedly connected with the second steel base plate, and the side surface of the crown beam is fixedly connected with the third steel base plate.
Optionally, the inclined throwing support assembly comprises an inclined throwing support and a bracket, one end of the inclined throwing support is provided with a second adjustable end, the inclined throwing support is connected with the second adjustable end, the other end of the second adjustable end supports the waist beam, the other end of the inclined throwing support is connected with the bracket, the other end of the bracket is fixedly connected with the bottom plate, and a second jack is arranged inside the second adjustable end.
Optionally, hoisting rings for hoisting are reserved on the first standard unit body of the steel truss, the second standard unit body of the steel truss and the third standard unit body of the steel truss.
Optionally, the tie bars include a first tie bar perpendicular to and fixedly connected to the upper chord and a second tie bar perpendicular to and fixedly connected to the lower chord.
Further, the invention also provides a construction method of the deep foundation pit inner support system with the steel truss and the inclined cast support, the deep foundation pit inner support system with the steel truss and the inclined cast support can be obtained based on the construction method, and the construction method comprises the following steps:
the construction of a vertical supporting pile of a foundation pit is completed, a crown beam is cast in situ at the top position of the supporting pile, embedded bars connected with a second steel base plate and a third steel base plate are embedded in the crown beam, the second steel base plate is fixedly connected with the top end of the crown beam through the embedded bars, and the third steel base plate is fixedly connected with the side surface of the crown beam through the embedded bars;
the steel truss module and each component of the inclined cast bracing assembly are prefabricated parts, and a first chord member assembly, a first standard unit body of a steel truss, a third standard unit body of the steel truss, a second standard unit body of the steel truss and a second chord member assembly are detachably connected in sequence from left to right through flange plates;
hoisting the steel truss module to the top of the crown beam;
connecting the left end of the lower chord of the first chord component with a first loose end through a flange plate, wherein the other end of the first loose end is detachably connected with a third steel base plate, the right end of the lower chord of the second chord component is connected with a fixed end through a flange plate, and the other end of the fixed end is detachably connected with the third steel base plate, so that the lower chord of the steel truss module is perpendicular to the support pile;
adjusting a gap between the vertical rod and the top of the crown beam by increasing or decreasing steel base plates between the first steel base plate and the second steel base plate, smearing lubricating oil between the first steel base plate and the second steel base plate, and after the positions of the first steel base plate, the second steel base plate and the steel base plates increased or decreased in the middle are calibrated, punching and tapping are carried out, and the first steel base plate, the second steel base plate and the steel base plates increased or decreased in the middle are fixedly connected through bolts;
a first jack is arranged inside the first loose end, the first jack is in contact with the third steel base plate, the external soil pressure of the foundation pit is transmitted to the steel truss module by applying precompression to the first jack, and the precompression is gradually applied to the first jack;
the tie bars vertically connect two groups of adjacent steel truss modules;
after a foundation pit is excavated to the bottom of a waist beam, drilling a plurality of blind holes in the side surface of the support pile, inserting a plurality of planting bars, arranging a mold of the waist beam outside the planting bars and close to the side surface of the support pile, pouring concrete in the mold, removing the mold after the concrete is solidified to obtain the waist beam, and reserving a back pressure soil platform from the position of the waist beam;
pouring a corbel on a bottom plate in a cast-in-place mode, wherein one end of an inclined cast support is connected with a second loose end through a flange plate, the free end of the second loose end is connected with the waist beam through a first anchor backing plate, the other end of the inclined cast support is connected with the corbel through a second anchor backing plate, and the back pressure soil platform is arranged in a space defined by the support pile, the inclined cast support and the bottom plate;
and a second jack is arranged in the second loose end and is in contact with the first anchor backing plate, and the pressure of soil outside the foundation pit is transmitted to the inclined cast support assembly by applying precompression through the second jack so as to apply precompression to the second jack step by step.
(III) advantageous effects
The invention has the beneficial effects that: before engineering is started, all components of the steel truss module and the inclined throwing support assembly can be prefabricated in a factory, and after the prefabricated parts are transported to a construction site, the prefabricated parts are connected, so that the construction speed is high, the materials can be detached, and the prefabricated parts can be reused in similar foundation pits, thereby reducing construction waste and saving material cost; the steel truss module has light dead weight, large rigidity, large adaptive span range and simple stress system, and can avoid adding upright posts and upright post piles in the foundation pit, thereby reducing disturbance damage to foundation soil, reducing the water leakage risk of bottom plate construction and providing a wider operation surface for the construction of an underground main body structure; and the inclined throwing support assembly is longitudinally arranged in the foundation pit to replace a second inner support, so that the strength and the rigidity of a foundation pit supporting system are improved, and the vertical construction space of the foundation pit is increased.
Drawings
FIG. 1 is a cross-sectional view of the deep foundation pit support system with steel trusses and inclined cast braces according to the present invention;
fig. 2 is a perspective view of a steel truss module arrangement of the present invention;
FIG. 3 is a perspective view of the upper chord, web member and tie bar connection node of the present invention;
FIG. 4 is a perspective view of the lower chord, web member and tie bar connection node of the present invention;
FIG. 5 is a schematic view of the connection of the support pile module, the first chord member and the loose end of the present invention;
figure 6 is a schematic view of the connection of the support pile module, the second chord member and the fixing end of the present invention;
FIG. 7 is a schematic connection diagram of a first standard cell body of the steel truss according to the present invention;
FIG. 8 is a schematic connection diagram of a second standard unit body of the steel truss according to the present invention;
fig. 9 is a schematic connection diagram of a third standard unit body of the steel truss according to the present invention;
FIG. 10 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 9;
FIG. 11 is a cross-sectional view taken along line B-B of FIG. 9;
FIG. 12 is a schematic view of the connection of the steel truss module and the tie bar of the present invention;
FIG. 13 is a schematic view of the connection of the diagonal member of the present invention to the wale;
FIG. 14 is a schematic view of the connection of the inclined throw support assembly of the present invention to the base plate.
[ description of reference ]
1: supporting piles; 2: a crown beam; 3: an upper chord; 4: a web member; 5: a lower chord; 6: a first loose end; 7: fixing the end socket; 8: inclined polishing support; 9: a wale; 10: a bracket; 12: a first chord assembly; 13: a second chord member; 14: a first standard unit body of the steel truss; 15: a second standard unit body of the steel truss; 16: a third standard unit body of the steel truss; 17: a hanger; 18: a first tie bar; 19: a second tie bar; 21: a second steel backing plate; 22: planting bars; 23: a third steel backing plate; 31: a vertical rod; 32: a first steel backing plate; 51: a flange plate; 61: a first jack; 80: a second loose end; 81: a first anchor backing plate; 82: a second anchor backing plate; 83: and a second jack.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, which are illustrated in the accompanying drawings.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; "connected" may be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 2, the invention provides an inner support system of a deep foundation pit with a steel truss and an inclined cast support, which comprises: the device comprises a pair of supporting pile modules, a plurality of steel truss modules, a plurality of inclined cast-off supporting assemblies and a plurality of groups of tie bars. Two ends of the steel truss module are correspondingly connected with the top ends of the paired supporting pile modules one by one; the top of the inclined cast support component supports the side wall of the support pile module; the tie bars are vertically connected with the plurality of steel truss modules, and the tie bars, the support pile modules, the steel truss modules and the inclined cast-strut assemblies form a space stress system.
Before engineering is started, all components of the steel truss module and the inclined throwing support assembly can be prefabricated in a factory, and after the prefabricated parts are transported to a construction site, the prefabricated parts are connected, so that the construction speed is high, the materials can be detached, and the prefabricated parts can be reused in similar foundation pits, thereby reducing construction waste and saving material cost; the steel truss module has light dead weight, large rigidity, large adaptive span range and simple stress system, and can avoid adding the upright post and the upright post pile in the foundation pit, thereby reducing disturbance damage to foundation soil, reducing the water leakage risk of bottom plate construction and providing a wider operation surface for the construction of an underground main body structure; and the inclined throwing support assembly is longitudinally arranged in the foundation pit to replace a second inner support, so that the strength and the rigidity of a foundation pit supporting system are improved, and the vertical construction space of the foundation pit is increased. The invention is suitable for foundation pit engineering with tight construction period and high requirement on the foundation construction working surface.
Referring to fig. 1 to 11, the steel truss module comprises a first chord member assembly 12, a first standard unit body 14, a third standard unit body 16, a second standard unit body 15 and a second chord member assembly 13 which are detachably connected in sequence from left to right through flange plates 51, the third standard unit body 16 is arranged at the center of the steel truss module, and the left end of the first chord member assembly 12 and the right end of the second chord member assembly 13 are respectively connected with corresponding supporting pile modules. The first chord member assembly 12, the first standard unit body 14 of the steel truss, the third standard unit body 16 of the steel truss, the second standard unit body 15 of the steel truss and the second chord member assembly 13 can be prefabricated and molded in a factory, and after being transported to a construction site, the steel truss modules can be spliced and assembled only by connecting the first chord member assembly with the flange plates 51; the traditional inner support is mainly made of reinforced concrete materials, and the next soil body excavation can be carried out only after concrete is solidified to a certain strength, so that the construction period is relatively long.
Further, the steel truss modules all include lower chord 5, upper chord 3 and web member 4, the upper end and the upper chord 3 of web member 4 are connected, the lower extreme and the lower chord 5 of web member 4 are connected, the left end of the upper chord 3 of first chord subassembly 12 and the right-hand member of the upper chord 3 of second chord subassembly 13 all are provided with downwardly extending's montant 31, montant 31 perpendicular to lower chord 5, upper chord 3, web member 4 and montant 31 are square steel pipe. The vertical rod 31 of the first chord component 12 and the vertical rod 31 of the second chord component 13 are also prefabricated and formed in a factory, and temporary construction on a construction site is not needed; each member of the steel truss module is a square steel pipe, and the square steel pipes are compared with round steel pipes, so that extra square head reuse is not needed for connection, and the cost is saved.
In addition, the lower end of the vertical rod 31 is fixedly connected with a first steel backing plate 32, the upper end of the supporting pile module is fixedly connected with a second steel backing plate 21, and the first steel backing plate 32 and the second steel backing plate 21 are detachably connected. The first steel backing plate 32 can also be prefabricated in the factory and transported to the construction site after completing the fixed connection with the vertical rod 31.
Wherein the supporting pile module is provided with a plurality of third steel backing plates 23; the left end of the lower chord 5 of the first chord component 12 is connected with a first loose end 6, and the other end of the first loose end 6 is detachably connected with a corresponding third steel backing plate 23; the right end of the lower chord 5 of the second chord component 13 is connected with a fixed end head 7, and the other end of the fixed end head 7 is detachably connected with a corresponding third steel backing plate 23; a first jack 61 is arranged in the first loose end 6. Preferably, the upper ends of the first loose end 6 and the fixed end 7 are correspondingly provided with a hanging rack 17, the hanging rack 17 is an L-shaped hanging rack, the L-shaped hanging rack comprises a vertical plate and a horizontal plate which are connected with each other, the vertical plate of the hanging rack 17 can be fixedly connected with the upper end of the first loose end 6 or the upper end of the fixed end 7, and the horizontal plate of the hanging rack 17 is arranged at the top of the supporting pile module and is in surface contact with the top of the supporting pile module, so that the temporary supporting function during the installation of the first loose end 6 and the fixed end 7 is realized, and the installation of the first loose end 6 and the fixed end 7 is facilitated.
In addition, the first loose end 6 comprises an end head, a pressure maintaining device and a first jack 61. The right end of the end head is connected with the lower chord 5 through a flange plate 51, and the left end of the end head is connected with a plurality of pressure maintaining devices and a first jack 61; the pressure maintaining device is arranged between the end socket and the third steel backing plate 23 and comprises a sleeve and a push rod, the sleeve is fixedly connected with the end socket, the push rod is arranged in the sleeve and can axially move relative to the end socket, a fixedly connected base is arranged at the tail end of the push rod, and the base abuts against the third steel backing plate 23; the first jack 61 is arranged between the adjacent pressure maintaining devices, one end of the first jack 61 is connected with the end head, and the other end of the first jack is propped against the third steel backing plate 23; when the prestress applied by the first jack 61 reaches a preset standard, the nut is screwed down towards the direction of the end head so that the nut can be propped against the left end of the sleeve, and therefore the pressure maintaining effect is achieved; and can be in the position between base and the nut, set up the force cell sensor in the inside of push rod to read the atress numerical value of pressurizer, and can real time monitoring follow-up work progress prestressing force's on the push rod change condition, in order to improve the safety guarantee when constructing the foundation ditch.
Further, the supporting pile module comprises a supporting pile 1, a waist beam 9 and a top beam 2, wherein the waist beam 9 is cast on the side wall of the supporting pile 1, the top beam 2 is cast on the top end of the supporting pile 1, the top end of the top beam 2 is fixedly connected with a second steel backing plate 21, and the side face of the top beam 2 is fixedly connected with a third steel backing plate 23. The principle of the invention is that the prestressed steel truss module and the inclined cast support component are utilized to support the support pile module, so that the support pile module obtains a prestress opposite to the external soil pressure load; when the external soil extrudes the supporting pile module, the supporting pile module can be really extruded only by offsetting the prestress in the supporting pile module. The application of the prestress can further improve the compression resistance of the support pile module to the external soil, thereby further improving the control capability of the foundation pit deformation.
As shown in fig. 13 and 14, the inclined throwing support assembly comprises an inclined throwing support 8 and a bracket 10, one end of the inclined throwing support 8 is provided with a second loose end 80, the inclined throwing support 8 is connected with the second loose end 80, the other end of the second loose end 80 supports the waist beam 9, the other end of the inclined throwing support 8 is connected with the bracket 10, the other end of the bracket 10 is fixedly connected with the bottom plate, and a second jack 83 is arranged inside the second loose end 80. The inclined throwing support assembly can replace a traditional second-channel inner support, and both the inclined throwing support assembly and the second-channel inner support can play a role in supporting the horizontal load of the supporting pile module. Because the steel truss module is a steel structure and is light in weight, the inclined throwing support assembly can bear horizontal load and vertical load by being matched with the back pressure soil table, and therefore the inclined throwing support assembly can be used for replacing the second-channel inner support, the stand column and the stand column pile. The second jack 83 is installed in a manner similar to that of the first jack 61.
In addition, hanging rings for hoisting are reserved on the first standard unit body 14, the second standard unit body 15 and the third standard unit body 16 of the steel truss, and the hanging rings can be prefabricated in a factory and installed on each rod piece of the steel truss module.
Referring to fig. 1, 2 and 12, the tie bars include a first tie bar 18 and a second tie bar 19, the first tie bar 18 being perpendicular to and fixedly connected to the upper chord 3, and the second tie bar 19 being perpendicular to and fixedly connected to the lower chord 5. Preferably, the first tie bar 18 and the second tie bar 19 are arranged at positions where the web member 4 is perpendicular to the lower chord 5, in which case the first tie bar 18, the upper chord 3 and the web member 4 intersect at the same node, the second tie bar 19, the lower chord 5 and the web member 4 intersect at the same node, and both ends of the web member 4 are perpendicular to the first tie bar 18 and the second tie bar 19. Through the arrangement, the supporting strength of the truss and the intersecting node can be further improved.
In addition, the invention also provides a construction method of the deep foundation pit inner support system of the strip steel truss and the inclined cast support, the deep foundation pit inner support system of the strip steel truss and the inclined cast support can be obtained based on the construction method, and the construction method comprises the following steps:
finishing the construction of a vertical supporting pile 1 of a foundation pit, casting a crown beam 2 in situ at the top position of the supporting pile 1, embedding embedded bars 22 connected with a second steel base plate 21 and a third steel base plate 23 in the crown beam 2, fixedly connecting the second steel base plate 21 with the top end of the crown beam 2 through the embedded bars 22, and fixedly connecting the third steel base plate 23 with the side surface of the crown beam 2 through the embedded bars 22;
each component of the steel truss module and the inclined throwing support component is a prefabricated component, and the first chord component 12, the first standard unit body 14, the third standard unit body 16, the second standard unit body 15 and the second chord component 13 are detachably connected in sequence from left to right through flange plates 51. Specifically, a first standard unit body 14 of a steel truss, a second standard unit body 15 of the steel truss, a third standard unit body 16 of the steel truss, a first chord member assembly 12 and a second chord member assembly 13 are welded and formed by a lower chord member 5, an upper chord member 3 and a web member 4 respectively; the upper end of the web member 4 is connected with the upper chord 3 by welding, and the lower end of the web member 4 is connected with the lower chord 5 by welding; the web members 4 and the lower chord 5 are arranged at a certain angle, and the web members 4 are sequentially arranged between the upper chord 3 and the lower chord 5; the first standard unit body 14 of the steel truss, the second standard unit body 15 of the steel truss, the third standard unit body 16 of the steel truss, the first chord member assembly 12 and the second chord member assembly 13 are connected through a flange plate 51 on a construction site; the vertical rod 31 and the first steel backing plate 32 can be welded in a factory, and then the vertical rod 31 is welded with the upper chord 3 of the first chord component 12 and the upper chord 3 of the second chord component 13 respectively;
hoisting the steel truss module on the top of the crown beam 2;
connecting the left end of the lower chord 5 of the first chord component 12 with a first loose end 6 through a flange plate 51, detachably connecting the other end of the first loose end 6 with a third steel backing plate 23, connecting the right end of the lower chord 5 of the second chord component 13 with a fixed end 7 through a flange plate 51, and detachably connecting the other end of the fixed end 7 with the third steel backing plate 23 so as to enable the lower chord 5 of the steel truss module to be perpendicular to the support pile 1;
when the lower chord 5 at the first loose end 6 is installed, the lower chord 5 is perpendicular to the side wall of the foundation pit as a reference, the steel backing plates are added and decreased between the first steel backing plate 32 and the second steel backing plate 21, the gap between the vertical rod 31 and the top of the crown beam 2 is adjusted, lubricating oil is smeared between the first steel backing plate 32 and the second steel backing plate 21, and after the positions of the first steel backing plate 32, the second steel backing plate 21 and the steel backing plates added and decreased in the middle are calibrated, punching and tapping are carried out, and the first steel backing plate 32, the second steel backing plate 21, the steel backing plates added and decreased in the middle are fixedly connected through bolts; lubricating oil is smeared between the first steel backing plate 32 and the second steel backing plate 21 so as to ensure that the upper chord 3, the web members 4 and the vertical rods 31 are not deformed and damaged due to overlarge friction force between the first steel backing plate 32 and the second steel backing plate 21 when the lower chord 5 is prestressed;
a first jack 61 is arranged in the first loose end 6, the first jack 61 is in contact with the third steel base plate 23, the pressure of the soil outside the foundation pit is transmitted to the steel truss module by applying precompression through the first jack 61, and the precompression is gradually applied to the first jack 61; specifically, the first jack 61 first transmits the pre-pressure to the lower chord 5, and then transmits the pre-pressure to the web member 4, the upper chord 3, the tie bar and the vertical bar 31 through the lower chord 5; pre-pressure is gradually applied to the first jack 61, the display numerical value of the force measuring sensor is monitored in real time, and until the pre-pressure of the steel truss module reaches a set standard, the nut is screwed down to complete pressure maintaining of the steel truss module;
the tie bars vertically connect two groups of adjacent steel truss modules; vertically welding a first tie bar 18 with the upper chord 3, vertically welding a second tie bar 19 with the lower chord 5, and uniformly arranging a plurality of groups of tie bars among a plurality of steel truss modules; meanwhile, the tie bars are arranged at the positions where the web members 4 are perpendicular to the lower chord members 5, so that the supporting strength of the truss and the intersecting nodes is further improved;
after the foundation pit is excavated to the bottom of the waist rail, drilling a plurality of blind holes on the side surface of the support pile 1, inserting a plurality of planting bars, arranging a mould of the waist rail 9 outside the planting bars 22 and close to the side surface of the support pile 1, pouring concrete in the mould, removing the mould after the concrete is solidified to obtain the waist rail 9, and reserving a back pressure soil platform from the position of the waist rail 9;
pouring a bracket 10 on a bottom plate in a cast-in-place mode, wherein the construction mode of the bracket 10 is similar to that of the waist beam 9, one end of an inclined throwing support 8 is connected with a second loose end 80 through a flange plate 51, the free end of the second loose end 80 is connected with the waist beam 9 through a first anchor backing plate 81, the other end of the inclined throwing support 8 is connected with the bracket 10 through a second anchor backing plate 82, a back pressure soil platform is arranged in a space defined by the support pile 1, the inclined throwing support 8 and the bottom plate, and the bottom plate is a cast-in-place concrete plate;
a second jack 83 is arranged in the second loose end 80, the second jack 83 is in contact with the first anchor backing plate 81, the pressure of soil outside the foundation pit is transmitted to the inclined cast-strut assembly by applying prestress through the second jack 83, and the prestress is gradually applied to the second jack 83; the process of applying pre-pressure to the inclined throwing support assembly step by step can be similar to the process of applying pre-pressure to the steel truss module step by step.
The detachably connected parts of the invention can be detached and transported to other similar foundation pits for recycling after the project is completed, thereby reducing construction waste, protecting the environment, saving the material cost and improving the construction efficiency.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (8)
1. The utility model provides a deep basal pit inner support system of belted steel truss and inclined throw brace which characterized in that, deep basal pit inner support system includes:
pairs of fender pile modules;
the two ends of the steel truss modules are correspondingly connected with the top ends of the paired supporting pile modules one by one; both ends of the steel truss module are provided with vertical rods, and the vertical rods are vertically connected with the supporting pile modules, so that the supporting pile modules can support the steel truss module; the steel truss module can horizontally move relative to the supporting pile module before prestress adjustment is finished;
the top of the inclined throwing support assembly supports the side wall of the supporting pile module; a back pressure soil table is reserved between the supporting pile module and the inclined throwing support assembly;
the tie bars, the supporting pile modules, the steel truss modules and the inclined cast-off strut assembly form a space stress system;
the steel truss module comprises a first chord member assembly, a first standard unit body of the steel truss, a third standard unit body of the steel truss, a second standard unit body of the steel truss and a second chord member assembly which are detachably connected in sequence from left to right through flange plates, the third standard unit body of the steel truss is arranged at the center of the steel truss module, and the left end of the first chord member assembly and the right end of the second chord member assembly are respectively connected with the corresponding supporting pile modules;
the supporting pile module is provided with a plurality of third steel base plates; the left end of the lower chord of the first chord component is connected with a first loose end socket, and the other end of the first loose end socket is detachably connected with the corresponding third steel base plate; the right end of the lower chord of the second chord component is connected with a fixed end head, and the other end of the fixed end head is detachably connected with the corresponding third steel base plate; and a first jack is arranged in the first movable end head.
2. The system of claim 1, wherein the steel truss modules each comprise a lower chord, an upper chord and a web member, the upper end of the web member is connected with the upper chord, the lower end of the web member is connected with the lower chord, the left end of the upper chord of the first chord assembly and the right end of the upper chord of the second chord assembly are both provided with the vertical bar extending downwards, the vertical bar is perpendicular to the lower chord, and the lower chord, the upper chord, the web member and the vertical bar are all square steel pipes.
3. The deep foundation pit inner support system with the steel truss and the inclined cast support according to claim 2, wherein a first steel base plate is fixedly connected to the lower end of the vertical rod, a second steel base plate is fixedly connected to the upper end of the support pile module, and the first steel base plate and the second steel base plate are detachably connected.
4. The system of claim 3, wherein the support pile module comprises a support pile, a waist beam and a crown beam, the waist beam is cast on the side wall of the support pile, the crown beam is cast on the top end of the support pile, the top end of the crown beam is fixedly connected with the second steel backing plate, and the side surface of the crown beam is fixedly connected with the third steel backing plate.
5. The system of claim 4, wherein the inclined throwing support assembly comprises an inclined throwing support and a bracket, a second loose end is arranged at one end of the inclined throwing support, the inclined throwing support is connected with the second loose end, the other end of the second loose end supports the waist beam, the other end of the inclined throwing support is connected with the bracket, the other end of the bracket is fixedly connected with a bottom plate, and a second jack is arranged inside the second loose end.
6. The deep foundation pit inner support system with the steel truss and the inclined cast support according to any one of claims 1 to 5, wherein hoisting rings for hoisting are reserved on the first standard unit body of the steel truss, the second standard unit body of the steel truss and the third standard unit body of the steel truss.
7. The steel truss and inclined throw bracing deep foundation pit inner support system according to any one of claims 2-5, wherein the tie bars comprise a first tie bar and a second tie bar, the first tie bar is perpendicular to and fixedly connected with the upper chord, and the second tie bar is perpendicular to and fixedly connected with the lower chord.
8. A construction method of the deep foundation pit inner support system with the steel truss and the inclined parabolic support is characterized in that the deep foundation pit inner support system with the steel truss and the inclined parabolic support according to claim 5 can be obtained based on the construction method, and the construction method comprises the following steps:
the construction of the supporting pile in the vertical direction of the foundation pit is completed, the crown beam is cast in place at the top position of the supporting pile, embedded bars connected with the second steel base plate and the third steel base plate are embedded in the crown beam, the second steel base plate is fixedly connected with the top end of the crown beam through the embedded bars, and the third steel base plate is fixedly connected with the side face of the crown beam through the embedded bars;
each component of the steel truss module and the inclined cast bracing assembly is a prefabricated component, and the first chord member assembly, the first standard unit body of the steel truss, the third standard unit body of the steel truss, the second standard unit body of the steel truss and the second chord member assembly are detachably connected in sequence from left to right through flange plates;
hoisting the steel truss module to the top of the crown beam;
connecting the left end of the lower chord of the first chord component with the first loose end through a flange plate, connecting the other end of the first loose end with the third steel backing plate in a detachable manner, connecting the right end of the lower chord of the second chord component with the fixed end through a flange plate, and connecting the other end of the fixed end with the third steel backing plate in a detachable manner, so that the lower chord of the steel truss module is perpendicular to the support pile;
adjusting a gap between the vertical rod and the top of the crown beam by increasing or decreasing steel base plates between the first steel base plate and the second steel base plate, smearing lubricating oil between the first steel base plate and the second steel base plate, and after the positions of the first steel base plate, the second steel base plate and the steel base plates increased or decreased in the middle are calibrated, punching and tapping are carried out, and the first steel base plate, the second steel base plate and the steel base plates increased or decreased in the middle are fixedly connected through bolts;
the first jack is arranged in the first movable end socket and is in contact with the third steel base plate, the external soil pressure of the foundation pit is transmitted to the steel truss module by applying precompression to the first jack, and the precompression is gradually applied to the first jack;
the tie bars vertically connect two groups of adjacent steel truss modules;
after a foundation pit is excavated to the bottom of the waist beam, drilling a plurality of blind holes in the side surface of the support pile, inserting a plurality of planting bars, arranging a mold of the waist beam outside the planting bars and close to the side surface of the support pile, pouring concrete in the mold, removing the mold after the concrete is solidified to obtain the waist beam, and reserving the counter-pressure soil table from the position of the waist beam;
casting the bracket on the bottom plate in a cast-in-place manner, wherein one end of the inclined cast support is connected with the second loose end through a flange plate, the free end of the second loose end is connected with the waist beam through a first anchor backing plate, the other end of the inclined cast support is connected with the bracket through a second anchor backing plate, and the soil back pressure platform is arranged in a space surrounded by the support pile, the inclined cast support and the bottom plate;
the second jack is arranged inside the second loose end and is in contact with the first anchor backing plate, and the pre-pressure applied to the foundation pit outer soil is transmitted to the inclined cast support assembly through the pre-pressure applied to the second jack so as to apply the pre-pressure to the second jack step by step.
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| KR100635331B1 (en) * | 2006-03-16 | 2006-10-18 | (주)써포텍 | Raker support structure for underground pre-scaffolding system |
| CN104099933B (en) * | 2014-04-01 | 2016-03-02 | 浙江省建筑设计研究院 | Support system ruggedized construction after a kind of foundation pit deepened |
| CN105332452B (en) * | 2015-11-26 | 2017-10-13 | 中国航空规划设计研究总院有限公司 | Cable curtain wall supporting system and its construction method of a kind of top provided with steel truss |
| CN209179021U (en) * | 2018-12-03 | 2019-07-30 | 中国建筑一局(集团)有限公司 | A kind of foundation pit campshed support system |
| CN113529737A (en) * | 2019-04-15 | 2021-10-22 | 陈林 | Foundation pit support frame |
| CN110965558A (en) * | 2019-12-19 | 2020-04-07 | 中南大学 | Large-span long and narrow foundation pit supporting method and supporting structure |
| CN111851519A (en) * | 2020-07-27 | 2020-10-30 | 广西大学 | Space truss multilayer internal support system |
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