CN111472362A - Inclined support foundation pit supporting system and construction method - Google Patents
Inclined support foundation pit supporting system and construction method Download PDFInfo
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- CN111472362A CN111472362A CN202010444649.8A CN202010444649A CN111472362A CN 111472362 A CN111472362 A CN 111472362A CN 202010444649 A CN202010444649 A CN 202010444649A CN 111472362 A CN111472362 A CN 111472362A
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000009412 basement excavation Methods 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000002689 soil Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention relates to an inclined support foundation pit supporting system and a construction method, which relate to the technical field of building foundation pit construction and comprise a deep foundation pit body, wherein a fender post and a water stop pile are arranged at the edge of the deep foundation pit body; further comprising the steps of: excavating a deep foundation pit; driving a vertical column pile, a water stop pile and a fender post; excavating a foundation pit bottom; a reinforcing platform and a bearing platform are arranged in the bottom of the foundation pit; a connecting frame is arranged between the upright post pile and the fender pile, and an inclined support frame is arranged between the connecting frame and the bearing platform. The connecting frame can enhance the connecting strength between the upright post pile and the fender pile, and the inclined support frames are fixedly connected with the connecting frame, so that the inclined support frames can be connected together on the whole structure, and the connecting strength between the inclined support frames can be higher, thereby better supporting the deep foundation pit.
Description
Technical Field
The invention relates to the technical field of building foundation pit construction, in particular to an inclined support foundation pit supporting system and a construction method.
Background
Along with the speed of urbanization in China, people develop and utilize underground spaces increasingly widely, building foundation pit engineering has the characteristics of large size, depth, tightness, closeness and the like, and various novel enclosure forms and construction processes are continuously developed. For large-area deep foundation pit engineering, the horizontal supporting structure is generally adopted, huge soil pressure is transmitted to the supporting body on the other side through the horizontal supporting structure, when the plane size of the foundation pit is large, the large-length supporting structure is needed to transmit the soil pressure, and in addition, when the support is dismantled, the supports on two sides are also symmetrically dismantled, so that the construction difficulty is large.
In order to solve the above problems, the prior art has developed an inclined supporting structure, for example, the utility model patent with publication number CN108978670A specifically discloses a supporting method for deep foundation pit local deep pit inclined throwing, which includes the following steps: a. excavating a deep foundation pit, b, pouring a concrete support, c, arranging a plurality of inclined cast supports, and completing the support of the inclined cast supports of the local deep pit of the deep foundation pit.
Although the technical scheme can reduce the construction difficulty through the arrangement of the inclined supports, the local inclined cast support of the deep foundation pit has no method for forming a plurality of local inclined cast support supports into a whole independently, so that the support strength of a single inclined cast support is limited, and no method has a better support effect on the support of the deep foundation pit.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an inclined support foundation pit supporting system which can enhance the connection among a plurality of inclined supports, so that the support strength of the inclined supports is higher, and the inclined support foundation pit supporting system can better support a deep foundation pit.
The above object of the present invention is achieved by the following technical solutions:
an inclined support foundation pit supporting system comprises a deep foundation pit body, wherein a fender post and a water stop post are arranged at the edge of the deep foundation pit body, a stand column pile is arranged on one side, facing the center of the deep foundation pit body, of the fender post, a connecting frame is arranged between the stand column pile and the fender post, and one side, facing the center of the deep foundation pit body, of the connecting frame is connected with a plurality of inclined support frames;
the connecting frame comprises a first support column fixedly connected with the upper end of the fender post, a second support column fixedly connected with the upper end of the upright post pile and a first horizontal supporting frame arranged between the first support column and the second support column;
one end and the second pillar fixed connection of bearing diagonal frame, the other end and deep basal pit body diapire fixed connection.
Through adopting above-mentioned technical scheme, the link between stand pile and the fender pile can strengthen the joint strength between stand pile and the fender pile, bearing diagonal frame and link fixed connection, can make a plurality of bearing diagonal frame link together on overall structure, thereby can make the joint strength between a plurality of bearing diagonal frames bigger, when the bearing diagonal played the supporting role to the deep basal pit body, a plurality of bearing diagonal interconnect can make the bearing strength of bearing diagonal bigger, can play better supporting role to the deep basal pit.
The present invention in a preferred example may be further configured to: the first horizontal support frame is provided with first connecting structures along two sides of the length direction, the first connecting structures on the two sides are arranged in a staggered mode, each first connecting structure comprises a pouring groove, a connecting groove and a connecting rod, the pouring groove is formed in the first horizontal support frame along the vertical direction, the connecting groove is formed in the horizontal support frame along the horizontal direction, the connecting rods are fixedly connected in the pouring grooves, the pouring grooves are communicated with the connecting grooves, and the connecting rods are arranged in extending spaces of the connecting grooves;
one sides of the first supporting column and the second supporting column, which face the horizontal supporting frame, are respectively provided with a second connecting structure matched with the first connecting structure, each second connecting structure comprises a step plate fixedly connected with the side walls of the first supporting column and the second supporting column, an inserting block fixedly connected with the step plate and a connecting hole formed in the end face, far away from the step plate, of the inserting block, the inserting block is in inserting fit with the connecting groove, and the connecting rod is in inserting fit with the connecting hole;
and a concrete layer is filled between the pouring groove and the inserting block.
Through adopting above-mentioned technical scheme, when first horizontal support frame is connected with first stand and second stand, the grafting piece of first stand and second stand lateral wall can be pegged graft to the spread groove in, and the connecting rod in the casting groove can peg graft to the connecting hole on the grafting piece, consequently first stand and second stand are great with first horizontal support frame's joint strength, in the cooperation of pegging graft piece and spread groove, to pouring the inslot intussuseption concrete, after the concrete solidifies, the joint strength between grafting piece and the first horizontal support frame is bigger, thereby can make the joint strength of link bigger, can play better supporting role when bearing diagonal frame is connected with the link.
The present invention in a preferred example may be further configured to: the inclined supporting frame comprises a plurality of third supporting columns which are parallel to each other, and a horizontal cross rod and an inclined rod which are fixedly connected with the third supporting columns, wherein the horizontal cross rod and the inclined rod are intersected with each other to form a plurality of triangular structures.
Through adopting above-mentioned technical scheme, horizontal pole and down tube can play the effect of connecting to the third pillar, and horizontal pole and down tube enclose synthetic triangle column structure comparatively steadily stable to can make the bearing diagonal have stronger supporting power, can play better supporting role to the deep basal pit body.
The present invention in a preferred example may be further configured to: a horizontal truss is arranged between the inclined support frame and the second support column, the horizontal truss comprises a support column fixedly connected with the deep foundation pit body and a second horizontal support frame arranged between the support column and the second support column, one side of the second horizontal support frame is fixedly connected with the second support column, and the other side of the second horizontal support frame is fixedly connected with the upper end of the support column;
the second horizontal support frame comprises two connecting columns which are parallel to each other and a plurality of supporting rods which are arranged between the two connecting columns, the two ends of each supporting rod are fixedly connected with the side walls of the two connecting columns respectively, and the two supporting rods are adjacent to each other to form a triangular structure between the supporting rods.
Through adopting above-mentioned technical scheme, support column and the second horizontal support frame in the horizontal truss can further play the effect of support to the bearing diagonal frame, make being connected between bearing diagonal frame and the deep basal pit body more firm to spliced pole and branch in the second horizontal support frame can guarantee the certain joint strength of horizontal truss self, thereby can play certain supporting role to the bearing diagonal frame, guarantee the strong supporting role of bearing diagonal frame to the deep basal pit body.
The present invention in a preferred example may be further configured to: be provided with the prestressed beam between bearing diagonal frame and the second pillar, the prestressed beam includes a plurality of bracing pieces and the extension roof beam structure with second pillar fixed connection, the bracing piece sets up and end to end fixed connection with the extension roof beam structure interval, the extension roof beam structure sets up the symmetrical structure of width in the middle of the narrow both ends, the bearing diagonal frame set up in one side of bracing piece and with bracing piece fixed connection.
Through adopting above-mentioned technical scheme, the joint strength between a plurality of bearing diagonal frames can further be strengthened to the prestressing force roof beam to the wide structure in the middle of extending the roof beam structure both ends narrow can offset certain bearing capacity on the bearing diagonal frame, thereby can make the bearing diagonal frame bigger to the support intensity of deep basal pit body, and the support effect is better.
The present invention in a preferred example may be further configured to: and a circular oblique arch is arranged between the adjacent oblique support frames and comprises a circular support frame fixedly connected with the oblique support frames and a fourth support column fixedly connected with the circular support frame, one end, far away from the circular support frame, of the fourth support column is fixedly connected with the second support column, and the center position of the circular support frame in the length direction is fixedly connected with the second support column.
Through adopting above-mentioned technical scheme, circular support frame and fourth pillar in the circular skew arch can play the effect of connecting to two adjacent bearing diagonal frames, make the joint strength between two adjacent bearing diagonal frames bigger to can play stable support to the deep basal pit body.
The present invention in a preferred example may be further configured to: this internal supporting platform that is provided with of deep basal pit, supporting platform is including inlaying the reinforcement platform of establishing in deep basal pit body diapire and setting up the bearing platform on reinforcing the bench, the one end and the bearing platform fixed connection of second pillar are kept away from to the bearing diagonal frame.
Through adopting above-mentioned technical scheme, this internal reinforcing platform of deep basal pit and bearing platform can play certain supporting role to the bearing platform, when the bearing platform is under construction bearing platform, with bearing platform looks fixed connection of bearing platform, has not only strengthened bearing strength of bearing platform, also can prevent that the sunken phenomenon from appearing in the deep basal pit body under the action of gravity of bearing platform simultaneously.
The present invention in a preferred example may be further configured to: be provided with third connection structure between bearing platform and the bearing diagonal frame, third connection structure includes with bearing diagonal frame lower extreme fixed connection's connecting block, sets up pre-installation hole and the fixed orifices on the bearing platform, the pre-installation hole is provided with a plurality ofly, and is a plurality of pre-installation hole and fixed orifices intercommunication, connecting block and pre-installation hole grafting cooperation, set up the spacing hole that corresponds with the fixed orifices on the connecting block, spacing dead lever has been pegged graft in fixed orifices and the spacing hole.
Through adopting above-mentioned technical scheme, when making bearing diagonal frame and supporting platform be connected, make the connecting block of bearing diagonal frame lower extreme and the pre-installation hole on the bearing platform be pegged graft mutually and cooperate, connect spacing dead lever to spacing hole in again, spacing dead lever can connect to in the connecting block in can inserting simultaneously, can play spacing fixed effect to bearing diagonal frame, make bearing diagonal frame and supporting platform's joint strength bigger, guarantee the support intensity of bearing diagonal frame to the deep basal pit body.
The second aim of the invention is realized by the following technical scheme:
a construction method of an inclined support foundation pit supporting system comprises the following steps:
step 1: excavating a deep foundation pit on the ground to be constructed to a first excavation surface;
step 2: driving a vertical column pile, a water stop pile and a fender post on the first excavation surface;
step 3: continuously excavating to the bottom of the foundation pit on the first excavation surface;
step 4: a reinforcing platform and a bearing platform are arranged at the edge of the bottom of the foundation pit;
step 5: a connecting frame is arranged between the upright post pile and the fender post, and an inclined support is arranged between the connecting frame and the bearing platform;
step 6: and excavating the whole foundation pit bottom to the same plane.
Through adopting above-mentioned technical scheme, divide the cubic excavation in the in-process of construction, make the process of construction safer, after setting up link and bearing diagonal frame, the bearing diagonal frame can interconnect together, and the soil pressure of deep basal pit one side directly transmits the soil layer at the bottom of the hole simultaneously in, avoids the opposite side of ordinary horizontal brace long distance transmission soil pressure to the foundation ditch, and the work progress is nimble convenient.
The present invention in a preferred example may be further configured to: in Step3, the edge of the base pit is sloped.
Through adopting above-mentioned technical scheme, when setting up the bearing diagonal frame, the setting of slope form can play certain supporting role to the bearing diagonal frame to make the process of setting up the bearing diagonal frame safe more convenient.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the connecting frame between the upright post pile and the guard post can enhance the connecting strength between the upright post pile and the guard post, the inclined support frames are fixedly connected with the connecting frame, and a plurality of inclined support frames can be connected together on the whole structure, so that the connecting strength between the inclined support frames can be higher, and when the inclined support supports the deep foundation pit body, the inclined support can better support the deep foundation pit;
2. the arrangement of the horizontal truss, the prestressed beam and the circular oblique arch can enhance the connection strength among the plurality of oblique supporting frames, so that the supporting strength of the plurality of oblique supporting frames on the deep foundation pit body can be ensured;
3. the cubic excavation is divided in the in-process of construction, makes the process of construction safer, after setting up link and bearing diagonal frame, the bearing diagonal frame can interconnect together, and the soil pressure of deep basal pit one side passes through the bearing diagonal frame and directly transmits the soil layer at the bottom of the hole simultaneously, avoids ordinary horizontal support long distance transmission soil pressure to the opposite side of foundation ditch, can play better supporting role to the deep basal pit.
Drawings
Fig. 1 is an overall schematic view of a deep foundation pit body supporting structure;
FIG. 2 is an enlarged partial schematic view of portion A of FIG. 1;
FIG. 3 is an enlarged partial schematic view of portion B of FIG. 1;
FIG. 4 is an exploded view of the structure between the diagonal bracing frame and the support platform;
fig. 5 is an overall schematic view of a foundation pit supporting structure in the second embodiment;
fig. 6 is an overall schematic view of a foundation pit supporting structure in the third embodiment;
FIG. 7 is a schematic diagram showing the operation of step one in the fourth embodiment;
FIG. 8 is a schematic diagram showing the operation of step two in the fourth embodiment;
FIG. 9 is a schematic diagram showing the operation of step three in the fourth embodiment;
FIG. 10 is a view showing the operation of step four in the fourth embodiment;
FIG. 11 is a schematic diagram showing the operation of step five in the fourth embodiment;
FIG. 12 is a diagram showing the operation of step six in the fourth embodiment.
In the figure, 1, a deep foundation pit body; 2. a fender pile; 3. water stopping piles; 4. a vertical column pile; 5. a connecting frame; 51. a first support; 52. a second support; 53. a first horizontal support frame; 6. an inclined support frame; 61. a third support; 62. a horizontal cross bar; 63. a diagonal bar; 7. a support platform; 71. a reinforcing table; 72. a bearing table; 8. a first connecting structure; 81. pouring a groove; 82. connecting grooves; 83. a connecting rod; 9. a second connecting structure; 91. a step plate; 92. an insertion block; 93. connecting holes; 10. a horizontal truss; 101. a support pillar; 102. a second horizontal support frame; 103. connecting columns; 104. a strut; 11. a third connecting structure; 111. connecting blocks; 112. pre-installing holes; 113. a fixing hole; 114. a limiting hole; 115. a limiting fixing rod; 12. a prestressed beam; 121. a support bar; 122. an extension beam frame; 13. a circular skew arch; 131. a circular support frame; 132. and a fourth support.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows: referring to fig. 1, the inclined support foundation pit supporting system disclosed by the invention comprises a deep foundation pit body 1, wherein a fender post 2 and a water stop post 3 are arranged at the edge of the deep foundation pit body 1, and the water stop post 3 can isolate underground water outside the deep foundation pit body 1 at the outer side of the deep foundation pit body 1, so that the underground water can be prevented from entering the deep foundation pit body 1 in the construction process, and the normal construction of the deep foundation pit body 1 is ensured. Fender pile 2 is provided with stand pile 4 towards one side at deep basal pit body 1 center, is provided with link 5 between stand pile 4 and the fender pile 2, and stand pile 4 can play certain supporting role to the lateral wall of deep basal pit body 1 with fender pile 2, can not lead to collapsing of deep basal pit body 1 inside wall earthwork in the construction stage.
Referring to fig. 1, one side of the connecting frame 5 facing the center of the deep foundation pit body 1 is connected with a plurality of inclined support frames 6 (only two are shown in the figure), one end of each inclined support frame 6 is fixedly connected with the connecting frame 5, and the other end of each inclined support frame is fixedly connected with the bottom wall of the deep foundation pit body 1. Be provided with supporting platform 7 in the deep basal pit body 1, supporting platform 7 is including inlaying reinforcing platform 71 and the bearing platform 72 of setting on reinforcing platform 71 of establishing in the deep basal pit body 1 diapire, and the one end and the bearing platform 72 fixed connection of link 5 are kept away from to bearing diagonal frame 6.
Referring to fig. 1, the connecting frame 5 includes a first supporting column 51 fixedly connected to the upper end of the fender pile 2, a second supporting column 52 fixedly connected to the upper end of the stud pile 4, and a first horizontal supporting frame 53 disposed between the first supporting column 51 and the second supporting column 52, and the upper end of the inclined supporting frame 6 far away from the stud pile 4 is fixedly connected to the second supporting column 52.
Referring to fig. 1, the inclined support frame 6 includes a plurality of third pillars 61 parallel to each other, and a horizontal cross bar 62 and an inclined bar 63 fixedly connected to the third pillars 61, the horizontal cross bar 62 and the inclined bar 63 are intersected with each other to form a plurality of triangle structures, two sides of the inclined support frame 6 in the width direction can be connected with reinforcing bars, and the lower ends of the reinforcing bars are extended and embedded into the soil layer at the bottom of the deep foundation pit body 1.
Referring to fig. 2, a horizontal truss 10 is arranged between the inclined support frame 6 and the second support column 52, the horizontal truss 10 includes a support column 101 fixedly connected with the deep foundation pit body 1 and a second horizontal support frame 102 arranged between the support column 101 and the second support column 52, one side of the second horizontal support frame 102 is fixedly connected with the second support column 52, and the other side is fixedly connected with the upper end of the support column 101. The second horizontal support frame 102 comprises two connecting columns 103 which are parallel to each other and a plurality of struts 104 which are arranged between the two connecting columns 103, two ends of the struts 104 are fixedly connected with the side walls of the two connecting columns 103 respectively, a triangular structure is formed between the adjacent struts 104, and the triangular structure formed by the struts 104 can strengthen the connecting structure of the whole horizontal truss 10.
Referring to fig. 3, the first horizontal support frame 53 is provided with the first connecting structures 8 along both sides of the length direction, the first connecting structures 8 on both sides are arranged in a staggered manner, the first connecting structures 8 include a pouring groove 81 formed in the first horizontal support frame 53 along the vertical direction, a connecting groove 82 formed in the horizontal support frame along the horizontal direction, and a connecting rod 83 fixedly connected in the pouring groove 81, the pouring groove 81 is communicated with the connecting groove 82, and the connecting rod 83 is arranged in an extending space of the connecting groove 82.
Referring to fig. 3, the first support columns 51 and the second support columns 52 are provided with second connecting structures 9 on one sides facing the horizontal support frame, the second connecting structures 9 are matched with the first connecting structures 8, and the second connecting structures 9 on the first support columns 51 and the second support columns 52 are also arranged in a staggered manner. The second connecting structure 9 includes a step plate 91 fixedly connected to the side walls of the first support column 51 and the second support column 52, an inserting block 92 fixedly connected to the step plate 91, and a connecting hole 93 formed in the end face of the inserting block 92 away from the step plate 91, the inserting block 92 is inserted into and matched with the connecting groove 82, the connecting rod 83 is inserted into and matched with the connecting hole 93, when the inserting block 92 is matched with the connecting groove 82, concrete is poured into the pouring groove 81, so that a concrete layer is formed between the inserting block 92 and the connecting groove 82, and the connecting of the inserting block 92 and the first horizontal support frame 53 can be more tightly and firmly connected.
Referring to fig. 4, one end of the inclined support frame 6, which is far away from the second support column 52, is fixedly connected with the bearing table 72, one end of the inclined support frame 6, which is connected with the bearing table 72, is embedded in a deep foundation pit soil layer, a third connecting structure 11 is arranged between the inclined support frame 6 and the bearing table 72, the third connecting structure 11 comprises a connecting block 111, a pre-installation hole 112 and a fixing hole 113, which are fixedly connected with the lower end of the inclined support frame 6, the pre-installation hole 112 is formed in the bearing table 72, the pre-installation hole 112 is provided with a plurality of pre-installation holes 112, the connecting block 111 is in inserted fit with the pre-installation hole 112, a limiting hole 114 corresponding to the fixing hole 113 is formed in the connecting block 111, and a limiting.
The implementation principle of the embodiment is as follows: after the water piles 3, the guard piles 2 and the upright piles 4 are driven, the first support columns 51 are erected at the upper ends of the guard piles 2, the first support columns 51 are connected end to end, the second support columns 52 are erected at the upper ends of the upright piles 4, the first horizontal support frames 53 are erected between the first support columns 51 and the second support columns 52, when the first horizontal support frames 53 are erected, the first connecting structures 8 and the second connecting structures 9 are connected in an aligned mode, concrete is poured into the pouring grooves 81, and therefore the first horizontal support frames 53 can be connected with the first support columns 51 and the second support columns 52 more firmly.
After the connecting frame 5 is erected, the horizontal truss 10 is installed on one side of the second support column 52, the inclined support frame 6 is installed on one side of the horizontal truss 10, one end, far away from the second support column 52, of the inclined support frame 6 is connected with the bearing table 72 when the inclined support frame 6 is installed, the connecting block 111 at the lower end of the inclined support frame 6 is matched with the pre-installation hole 112 in an inserted mode, then the limiting fixing rod 115 is inserted into the limiting hole 114, and the inclined support frame 6 is connected with the bearing table 72 in an installed mode.
Example two: referring to fig. 5, the difference between the sway brace 6 and the second support column 52 is that a prestressed beam 12 is disposed between the sway brace 6 and the second support column 52, the prestressed beam 12 includes a plurality of support rods 121 fixedly connected to the second support column 52 and an extension beam frame 122, the support rods 121 and the extension beam frame 122 are disposed at intervals and fixedly connected end to end, the support rods 121 and the extension beam frame 122 are connected to the second support column 52 by reinforcing bolts, the connection between the support rods 121 and the extension beam frame 122 can be performed by welding, the extension beam frame 122 is configured as a symmetrical structure with two narrow ends and a wide middle, the sway brace 6 is disposed on one side of the support rods 121 and is fixedly connected to the support rods 121, and the prestressed beam 12 can reinforce the connection strength between the sway braces 6.
Example three: referring to fig. 6, the difference between the first and second embodiments of the invention is that a circular oblique arch 13 is disposed between adjacent oblique supporting frames 6, the circular oblique arch 13 includes a circular supporting frame 131 fixedly connected to the oblique supporting frames 6 and a fourth supporting column 132 fixedly connected to the circular supporting frame 131, one end of the fourth supporting column 132 away from the circular supporting frame 131 is fixedly connected to the second supporting column 52, the central position of the circular supporting frame 131 in the length direction is fixedly connected to the second supporting column 52, and the fixed connection manner can be fixed by welding and bolts or other connecting members.
Example four: the invention discloses a construction method of an inclined support foundation pit supporting system, which comprises the following steps:
step 1: referring to fig. 7, a deep foundation pit is excavated on the ground to be constructed to a first excavation surface, and the edge of the inner wall of the first excavation surface is set to be slope-shaped, so that the phenomenon of collapse of soil on the side wall of the foundation pit can be prevented.
Step 2: referring to fig. 8, a vertical column pile 4, a water stop pile 3 and a fender pile 2 are arranged on a first excavation surface in a driving mode, the vertical column pile 4, the water stop pile 3 and the fender pile 2 can be formed into piles by means of slurry spraying or stirring, pile body cement is P.042.5R ordinary portland cement, the cement mixing amount of a foundation pit fender water stop curtain is 20%, the water cement ratio of slurry is initially set to be 1.75, in the drilling sinking and lifting process of a drilling machine, the sinking speed of a drill bit is 0.75m/min, the lifting speed is 1.5m/min, and each pile is required to be drilled downwards at a constant speed and lifted at a constant speed. When the pile body is arranged, the deep foundation pit body 1 is divided into multiple sections, and construction can be performed simultaneously in sections during construction.
Step 3: referring to fig. 9, excavation continues to be performed on the first excavation surface to the bottom of the foundation pit, the forming support condition of each pile is determined before excavation, excavation continues after the pressure-bearing state of the pile is qualified, the edge of the inner wall of the bottom of the foundation pit after excavation is in a slope shape, the pressure of the soil layer at the upper end of the edge of the foundation pit can be reduced, and therefore soil layer collapse can be avoided.
Step 4: referring to fig. 10, a reinforcing platform 71 and a load-bearing platform 72 are arranged at the edge of the bottom of the foundation pit, the reinforcing platform 71 and the load-bearing platform 72 are embedded in the foundation pit bottom soil layer, the load-bearing platform 72 is embedded in the reinforcing platform 71, the reinforcing platform 71 can be cast by using reinforced concrete or can be filled by stirring concrete and soil, the load-bearing platform 72 is a steel structure platform, and the load-bearing platform 72 and the reinforcing platform 71 can be fixedly connected by using concrete casting.
Step 5: referring to fig. 11, a connecting frame 5 is arranged between a column pile 4 and a fender pile 2, an inclined support frame 6 is arranged between the connecting frame 5 and a bearing table 72, when the inclined support frame 6 is connected with a weighing table 72, a part of a deep foundation pit soil layer needs to be dug out, and the soil layer needs to be filled after connection, so that the connection between the inclined support frame 6 and the deep foundation pit bottom is firmer.
Step 6: referring to fig. 12, the whole foundation pit bottom is excavated to the same plane, the soil layer below the inclined support frame 6 is removed, and the soil pressure at one side of the deep foundation pit is directly transmitted to the soil layer of the pit bottom through the inclined support frame 6.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides an inclined strut excavation supporting system, includes deep basal pit body (1), its characterized in that: a fender post (2) and a water stop pile (3) are arranged at the edge of the deep foundation pit body (1), a stand post (4) is arranged on one side, facing the center of the deep foundation pit body (1), of the fender post (2), a connecting frame (5) is arranged between the stand post (4) and the fender post (2), and one side, facing the center of the deep foundation pit body (1), of the connecting frame (5) is connected with a plurality of inclined support frames (6);
the connecting frame (5) comprises a first support column (51) fixedly connected with the upper end of the fender post (2), a second support column (52) fixedly connected with the upper end of the upright post pile (4) and a first horizontal support frame (53) arranged between the first support column (51) and the second support column (52);
one end of the inclined support frame (6) is fixedly connected with the second support column (52), and the other end of the inclined support frame is fixedly connected with the bottom wall of the deep foundation pit body (1).
2. The diagonal bracing foundation pit supporting system according to claim 1, wherein: the first horizontal support frame (53) is provided with first connecting structures (8) along two sides of the length direction, the first connecting structures (8) on two sides are arranged in a staggered mode, each first connecting structure (8) comprises a pouring groove (81) formed in the first horizontal support frame (53) along the vertical direction, a connecting groove (82) formed in the horizontal support frame along the horizontal direction and a connecting rod (83) fixedly connected in the pouring groove (81), the pouring groove (81) is communicated with the connecting groove (82), and the connecting rod (83) is arranged in an extending space of the connecting groove (82);
one sides of the first supporting column (51) and the second supporting column (52) facing the horizontal supporting frame are respectively provided with a second connecting structure (9) matched with the first connecting structure (8), each second connecting structure (9) comprises a step plate (91) fixedly connected with the side walls of the first supporting column (51) and the second supporting column (52), an inserting block (92) fixedly connected with the step plate (91) and a connecting hole (93) formed in the end face, far away from the step plate (91), of the inserting block (92), the inserting block (92) is in inserting fit with the connecting groove (82), and the connecting rod (83) is in inserting fit with the connecting hole (93);
and a concrete layer is filled between the pouring groove (81) and the insertion block (92).
3. The diagonal bracing foundation pit supporting system according to claim 1, wherein: the inclined support frame (6) comprises a plurality of third supporting columns (61) which are parallel to each other, and a horizontal cross rod (62) and an inclined rod (63) which are fixedly connected with the third supporting columns (61), wherein the horizontal cross rod (62) and the inclined rod (63) are intersected with each other to form a plurality of triangular structures.
4. The diagonal bracing excavation supporting system of claim 3, wherein: a horizontal truss (10) is arranged between the inclined support frame (6) and the second support column (52), the horizontal truss (10) comprises a support column (101) fixedly connected with the deep foundation pit body (1) and a second horizontal support frame (102) arranged between the support column (101) and the second support column (52), one side of the second horizontal support frame (102) is fixedly connected with the second support column (52), and the other side of the second horizontal support frame is fixedly connected with the upper end of the support column (101);
the second horizontal support frame (102) comprises two connecting columns (103) which are parallel to each other and a plurality of struts (104) which are arranged between the two connecting columns (103), the two ends of each strut (104) are fixedly connected with the side walls of the two connecting columns (103) respectively, and the struts (104) form a triangular structure.
5. The diagonal bracing excavation supporting system of claim 3, wherein: be provided with prestressed beam (12) between bracing frame (6) and second pillar (52), prestressed beam (12) include with second pillar (52) fixed connection a plurality of bracing pieces (121) and extend roof beam structure (122), bracing piece (121) and extend roof beam structure (122) interval set up and end to end fixed connection, extend roof beam structure (122) set up to the narrow symmetrical structure in middle of both ends, bracing frame (6) set up in one side of bracing piece (121) and with bracing piece (121) fixed connection.
6. The diagonal bracing excavation supporting system of claim 3, wherein: it is adjacent be provided with circular skew arch (13) between bearing diagonal frame (6), circular skew arch (13) include with bearing diagonal frame (6) fixed connection's circular support frame (131) and with circular support frame (131) fixed connection's fourth pillar (132), the one end and second pillar (52) fixed connection of circular support frame (131) are kept away from in fourth pillar (132), circular support frame (131) length direction's central point puts and second pillar (52) fixed connection.
7. A bracing excavation supporting system according to claim 4 or 5 or 6, wherein: be provided with supporting platform (7) in deep basal pit body (1), supporting platform (7) are including inlaying reinforcement platform (71) of establishing in deep basal pit body (1) diapire and bearing platform (72) of setting on reinforcement platform (71), the one end and bearing platform (72) fixed connection of second pillar (52) are kept away from in bearing diagonal frame (6).
8. The diagonal bracing excavation supporting system of claim 7, wherein: be provided with third connection structure (11) between bearing platform (72) and bearing diagonal frame (6), third connection structure (11) include with bearing diagonal frame (6) lower extreme fixed connection connecting block (111), set up pre-installation hole (112) and fixed orifices (113) on bearing platform (72), pre-installation hole (112) are provided with a plurality ofly, and are a plurality of pre-installation hole (112) are linked together with fixed orifices (113), connecting block (111) and pre-installation hole (112) are pegged graft the cooperation, set up spacing hole (114) corresponding with fixed orifices (113) on connecting block (111), spacing dead lever (115) have been pegged graft in fixed orifices (113) and spacing hole (114).
9. A construction method applied to the inclined support foundation pit supporting system of any one of claims 1-8, wherein the construction method comprises the following steps: the method comprises the following steps:
step 1: excavating a deep foundation pit on the ground to be constructed to a first excavation surface;
step 2: driving a vertical column pile (4), a water stop pile (3) and a fender post (2) on a first excavation surface;
step 3: continuously excavating to the bottom of the foundation pit on the first excavation surface;
step 4: a reinforcing platform (71) and a bearing platform (72) are arranged at the edge of the bottom of the foundation pit;
step 5: a connecting frame (5) is arranged between the upright post pile (4) and the fender post (2), and an inclined support frame (6) is arranged between the connecting frame (5) and the bearing platform (72);
step 6: and excavating the whole foundation pit bottom to the same plane.
10. A construction method applied to the inclined support foundation pit supporting system of claim 9, wherein: in Step3, the edge of the base pit is sloped.
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