CN212956543U - Active unloading structure of multi-support system deep foundation pit unearthing ramp - Google Patents

Active unloading structure of multi-support system deep foundation pit unearthing ramp Download PDF

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Publication number
CN212956543U
CN212956543U CN202020939323.8U CN202020939323U CN212956543U CN 212956543 U CN212956543 U CN 212956543U CN 202020939323 U CN202020939323 U CN 202020939323U CN 212956543 U CN212956543 U CN 212956543U
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China
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support
ramp
columns
foundation pit
unearthing
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CN202020939323.8U
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Chinese (zh)
Inventor
曾昭政
李文江
李平
陈聪
牛元君
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China Railway Construction Engineering Group Co Ltd
China Railway Construction Engineering Group Guangdong Co Ltd
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China Railway Construction Engineering Group Co Ltd
China Railway Construction Engineering Group Guangdong Co Ltd
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Abstract

The active unloading structure of the multi-support system deep foundation pit unearthing ramp comprises support columns, support beams, back-jacking reinforcing columns and an unearthing ramp, wherein the support columns are arranged in a foundation pit, the support beams are supported by the support columns, the support beams form a plurality of support layers, the back-jacking reinforcing columns are arranged between two adjacent support layers, the unearthing ramp is supported by an outer support body of the foundation pit and a first support layer and extends to the bottom of the foundation pit, the support beams can be supported among the support columns, crown beams and waist beams, and the back-jacking reinforcing columns or/and the support columns are steel lattice columns. The utility model discloses a set up several back tops and strengthen the post between two adjacent support layers, make the braced system can initiatively fall the lotus uninstallation, improve ramp bearing structure's bearing nature, avoid braced system to backfill incompact and receive the extra load that the backfill arouses and lead to the foundation ditch to warp, ensure construction safety, and avoid the ramp repeated backfill and lead to the engineering progress slow, the combined cost is high.

Description

Active unloading structure of multi-support system deep foundation pit unearthing ramp
Technical Field
The utility model relates to a construction technical field especially relates to an initiative off-load structure of many supporting system deep basal pit unearthed ramp.
Background
The deep foundation pit unearthing usually uses an unearthed ramp to replace a trestle bridge plate in consideration of saving engineering investment, but the setting of the unearthed ramp needs to meet a plurality of conditions: 1. the width must meet the vehicle traveling requirements; 2. the vertical force of the heavy-load earth moving vehicle borne by the ramp cannot be transmitted to the inner support; 3. the slope is steepest as possible so as to reduce the soil excavation amount of the temporary unearthed slope; 4. and after the lower supporting beams of the deep foundation pit of the multiple supporting systems are all closed, earth excavation is carried out. The condition leads the slope at the supporting beam to be backfilled after the supporting beam is closed, so that the earthwork at the bottom of the supporting beam plate cannot be backfilled compactly, and the non-compact backfilling easily causes the collapse of the lane, thereby causing safety accidents. Meanwhile, the supporting beam plate needs to bear the self pressure of the ramp and the dynamic load of the vehicle, so that the load is large, the structural requirement is high, and the supporting beam is often connected with the inner supporting structure, so that the stability of the enclosure structure is influenced, and the safety of the unearthed ramp structure is also influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of above-mentioned prior art, provide a structure safety, construction safety make things convenient for, initiative off-load structure that many support system deep basal pits unearthed ramp of initiative off-load uninstallation.
The utility model discloses a realize through following technical scheme:
the active unloading structure of the multi-support system deep foundation pit unearthing ramp comprises support columns, support beams, back-jacking reinforcing columns and an unearthing ramp, wherein the support columns are vertically arranged in a foundation pit, the support beams are supported by the support columns, the support beams form a plurality of support layers, the back-jacking reinforcing columns are arranged between every two adjacent support layers, and the unearthing ramp is supported by an outer support body of the foundation pit and a first support layer and extends to the bottom of the foundation pit. Through set up several back of the body reinforced column between the twice supports, improved unearthed ramp support system's structural bearing nature. The position of the back-jacking reinforcing column is designed according to the construction site, and is preferentially or intensively arranged in or near the area covered by the unearthed ramp.
As a further improvement to the above scheme, the back-jacking reinforcement columns are disposed between the support beams of the adjacent support layers, and the outer support body of the foundation pit is a guide wall disposed outside the foundation pit.
As a further improvement to the scheme, the back-jacking reinforcing column or/and the supporting upright column is/are steel lattice columns. The steel lattice column has good bearing performance and bending resistance, simple construction, simple disassembly and recycling.
As a further improvement of the scheme, steel plates are pre-embedded in the bottom surfaces and the top surfaces of the adjacent supporting layers respectively, and the back-jacking reinforcing columns of the steel lattice structure are arranged between the two supporting layers through the steel plates connecting the top surfaces and the bottom surfaces respectively. The bottom surface of the upper supporting layer and the top surface of the lower supporting layer at the opposite position are both pre-buried steel plates, and the two ends of the back-jacking reinforcing column are respectively welded on the pre-buried steel plates to form a reinforcing structure of the two supporting layers.
As a further improvement to the scheme, reinforcing ribs are further arranged at the joints of the top-returning reinforcing columns and the steel plates of the steel lattice structure, and the structural stability is further improved.
As a further improvement to the above scheme, the support upright of the steel lattice structure is vertically arranged in the foundation pit through an upright pile, and the upright pile is a cast-in-place pile. And hoisting the steel structure column into a steel reinforcement mesh cage of the cast-in-place pile, welding the steel structure column and the steel reinforcement mesh cage, and pouring concrete. During welding, the crane always hangs the lattice column to be positioned at the center of the steel bar mesh cage.
As a further improvement to the scheme, the steel lattice column comprises four angle steels and a plurality of batten plates, the four angle steels are enclosed to form a rectangular column, and the adjacent angle steels are fixedly connected through the plurality of batten plates arranged at intervals. The angle steel and the gusset plate must satisfy the corresponding quality standards.
As a further improvement of the above scheme, the supporting device further comprises a crown beam and a wale, and the supporting beam of the supporting layer is supported between the crown beam and the supporting upright, or between the wale and the supporting upright, or between the supporting upright and the supporting upright. Each supporting layer is positioned on the plane where the crown beam and the waist beam are positioned, the supporting beam is connected with the crown beam and the supporting beam, the waist beam and the supporting beam or the supporting beam and the supporting beam, and the supporting layers have supporting force from the crown beam and the waist beam, so that the structural bearing capacity is improved.
As a further improvement to the above solution, the support beams are arranged crosswise, and the support layer further includes a support plate arranged on the support beams. The supporting beams are arranged in a crossed mode according to actual engineering, and can be in a crisscross rectangular mode or in a random staggered mode. The supporting plate is arranged on the supporting beam, so that stress dispersion is facilitated, the structural stability is improved, and the back-jacking steel structure column can also be arranged between the upper supporting plate and the lower supporting plate.
As a further improvement to the above scheme, the unearthed ramp comprises a ramp plate, and backfill soil is filled below the ramp plate. The ramp plate can be a reinforced concrete pouring plate or an assembled steel plate. The shape of the extending section of the unearthed ramp can be set into a straight long ramp according to the actual construction site, and can also be a zigzag bent ramp or an arc ramp.
The construction method of the active unloading structure of the multi-support system deep foundation pit unearthed ramp comprises the following steps: when an upper supporting beam is constructed, a steel plate is embedded at the bottom of a beam plate and used for welding the upper end of a steel lattice column (a back-jacking reinforcing column), and when a next supporting beam is constructed, a steel plate is embedded at the top surface of the beam plate and used for welding the lower end of the steel lattice column (the back-jacking reinforcing column); immediately welding and manufacturing a mounting steel lattice column (a back-up reinforcing column) after the concrete support beam is poured; after the steel lattice column (the back-jacking reinforcing column) is installed, backfilling earthwork in the middle of two beam plate supports, compacting by using machinery, and then backfilling, trimming and compacting the slope soil to form the unearthed slope. The lattice column and the beam slab support form an active load-reducing and unloading system to resist the self weight of the earthwork ramp and the load of the mud-headed vehicle.
The utility model discloses a set up several back of the top and strengthen the post between two adjacent supporting layers, make the support system can initiatively drop the load uninstallation, improve unearthed ramp bearing property of bearing structure, and whole earthwork transportation bearing structure can not exert an influence to foundation ditch main part support system, guaranteed the stability of foundation ditch, in the deep basal pit earthwork excavation work progress of having solved multichannel concrete support, foundation ditch ramp repeated backfill, the engineering progress is slow, the comprehensive expense is high problem, and compare in natural slope, independently construct steel trestle or concrete trestle, security and economic nature are greatly improved; the top-returning reinforced column and the supporting column adopt steel lattice columns, can be effectively welded with the upper beam plate and the lower beam plate, are convenient to construct and simple in structure, and can be recycled; unearthed ramp bearing structure has guaranteed foundation ditch supporting construction's stability, has avoided braced system backfill incompact and has leaded to the incident, has avoided foundation ditch braced system to receive the extra load that the ramp backfill arouses to lead to the foundation ditch to warp simultaneously, has ensured construction safety.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a plan view of the embodiment of the present invention.
Fig. 3 is a schematic side view of an embodiment of the present invention.
Fig. 4 is an installation schematic diagram of the roof-returning reinforcing column in the embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view a-a of fig. 4.
Fig. 6 is a schematic cross-sectional view of B-B in fig. 4.
Fig. 7 is a schematic cross-sectional view of C-C in fig. 6.
Reference numerals: 1-supporting a column; 2-a support beam; 3-a back-jacking reinforcing column; 4-a support plate; 5-a crown beam; 6-waist rail; 7-a continuous wall; 8-a drainage ditch; 9-a guide wall; 10-pit bottom; 11-unearthed ramp; 12-a post pile; 13-backfilling; 21-steel plate; 31-angle steel; 32-batten plate; 33-reinforcing ribs.
Detailed Description
An active unloading structure of a multi-support system deep foundation pit unearthing ramp 11 is shown in fig. 1-3 and comprises support columns 1, support beams 2, back-jacking reinforcing columns 3 and an unearthing ramp 11, wherein a plurality of the support columns 1 are vertically arranged in a foundation pit, a plurality of the support beams 2 are supported by a plurality of the support columns 1, a plurality of the support beams 2 form a plurality of support layers, a plurality of the back-jacking reinforcing columns 3 are arranged between two adjacent support layers, and the unearthing ramp 11 is supported by an outer support body of the foundation pit and a first support layer and extends to the bottom of the foundation pit. Through set up several back of the body reinforced column 3 between the twice supports, improved unearthed ramp 11 support the structural bearing nature of the system. The position of the roof-back reinforcing columns 3 is designed according to the construction site, and is preferentially or intensively arranged in or near the area covered by the unearthed ramp 11. Referring to fig. 2, the roof-back reinforcing columns 3 are disposed at positions where the support beams 2 cross and at positions where the support beams 2 are spaced apart from each other at a large distance.
As one embodiment, as shown in fig. 3, the active unloading structure further includes a crown beam 5 and a wale 6, and the support beam 2 of the support layer is supported between the crown beam 5 and the support column 1, or between the wale 6 and the support column 1, or between the support column 1 and the support column 1. Each supporting layer is positioned on the plane where the crown beam 5 and the waist beam 6 are positioned, the supporting beam 2 is connected with the crown beam 5 and the supporting beam 2, the waist beam 6 and the supporting beam 2 or the supporting beam 2 and the supporting beam 2, and the supporting layers have supporting force from the crown beam 5 and the waist beam 6, so that the structural bearing capacity is improved. A drainage ditch 8 is arranged outside the foundation pit, and the foundation pit supporting structure comprises a crown beam 5, a waist beam 6 and a continuous wall 7. The number of wales 6 and the number of support layers are determined according to the actual situation, and the number of the wales and the number of the support layers may be the same or different. In this embodiment, two wales 6 and two support layers are provided, and the roof-return reinforcing columns 3 are provided between the support beams 2 of the second support layer and the third support layer.
In this embodiment, the outer support body of the foundation pit is a guide wall 9 arranged outside the foundation pit, the unearthed ramp 11 is supported by the guide wall 9 and the first support layer and extends to the bottom of the foundation pit, and the extension section can be supported by setting a bridge pile. A ramp plate can be paved on the unearthed ramp 11, and backfill soil 13 is filled below the ramp plate. The ramp plate may be a reinforced concrete cast plate or an assembled steel plate 21. The shape of the extension section of the unearthed ramp 11 can be a straight long ramp according to the actual construction site, a zigzag bent ramp or an arc ramp.
The support beams 2 are arranged in a crossed manner, and the support layer further comprises a support plate 4 arranged on the support beams 2. The support beam 2 is arranged crosswise according to the actual engineering, and can be a rectangle crossed vertically and horizontally, or a shape designed according to mechanics as shown in fig. 2. Set up backup pad 4 on supporting beam 2, be favorable to the stress dispersion, improve the structural stability, the reinforcing column 3 that backs down also can set up between backup pad 4 from top to bottom.
In one embodiment, the roof-return reinforcing columns 3 are arranged between the support beams 2 of adjacent support layers.
The reinforcing columns 3 and the supporting columns 1 can be any type of structural supporting columns, and as one embodiment, the reinforcing columns 3 and the supporting columns 1 are steel lattice columns. The steel lattice column has good bearing performance and bending resistance, simple construction, simple disassembly and recycling.
As shown in fig. 1 and 3, the support column 1 of the steel lattice structure is vertically arranged in a foundation pit through a column pile 12, and the column pile 12 is a cast-in-place pile. In this embodiment, the stud pile 12 goes deep into the foundation pit bottom 13, and the steel structure post is hoisted into the steel reinforcement cylinder mould of the stud pile 12, welds the steel structure post and the steel reinforcement cylinder mould, and then pours the concrete. During welding, the crane always hangs the lattice column to be positioned at the center of the steel bar mesh cage.
Referring to fig. 4 and 6, steel plates 21 are embedded in the bottom surfaces and the top surfaces of the adjacent support layers, respectively, and the roof-returning reinforcing columns 3 of the steel lattice structure are arranged between the two support layers through the steel plates 21 connecting the top surfaces and the bottom surfaces, respectively. The bottom surface of the upper supporting layer and the top surface of the lower supporting layer at the opposite position are both pre-embedded steel plates 21, and the two ends of the back-jacking reinforcing column 3 are respectively welded on the pre-embedded steel plates 21 to form a reinforcing structure of the two supporting layers.
As shown in fig. 7, a reinforcing rib 33 is further provided at the joint of the roof-returning reinforcing column 3 and the steel plate 21 of the steel lattice structure, so as to further improve the structural stability.
The steel lattice column can be in any form and structure, and as one embodiment, as shown in fig. 5, the steel lattice column includes four angle steels 31 and a plurality of lacing plates 32, the four angle steels 31 enclose into a rectangular column, and adjacent angle steels 31 are fixedly connected through a plurality of lacing plates 32 arranged at intervals.
Manufacturing and installing the steel lattice column: 1. the angle steel 31 and the gusset plate 32 must meet corresponding quality standards, joints should be staggered during butt welding of lattice columns, and the joints of the angle steel 31 with the same section are not more than 50%; 2. before welding, measuring the mounting position of the back-jacking reinforcing column 3 to ensure the position of the back-jacking column to be accurate, recording, wherein the allowable deviation of the back-jacking column position is less than 50mm, and the verticality deviation of the back-jacking column is controlled according to the first concrete supporting net height and the second concrete supporting net height of < 1/300; 3. when the steel upright is arranged in construction, necessary measures are taken to ensure that each edge of the steel lattice column is strictly vertical or parallel to the axis of the main support and the steel upright is vertical; 4. if the steel lattice column needs to be spliced on site, the splicing material of the steel lattice column needs to use the same section bar of the upright column angle steel 31, the butt joint end part of the angle steel 31 needs to be ground flat, the end face needs to be horizontal, a patch plate 32 is additionally arranged at the splicing part, the periphery of the splicing part of the steel lattice column needs to be fully welded, the height of a welding line needs to be 10mm, and the quality needs to meet the relevant specifications.
The steel lattice column is designed according to a construction site, and must meet design specifications, and as an embodiment of the steel lattice column, the steel lattice column has a size of 600 × 600, is composed of four L160 × 16 angle steels 31, and is welded with a 540 × 300 × 12@600 rectangular batten plate 32 on the outer side. The size of the pre-buried steel plate 21 is 800 multiplied by 20, and the height of a welding seam is required to be 10 mm. The verticality allowable deviation of the steel lattice column is less than or equal to 1/200.
The construction method of the active unloading structure of the multi-support system deep foundation pit unearthed ramp 11 comprises the following steps: when an upper supporting beam 2 is constructed, a steel plate 21 is embedded at the bottom of a beam plate and used for welding the upper end head of a steel lattice column (a back-jacking reinforcing column 3), and when a next supporting beam 2 is constructed, the steel plate 21 is embedded on the top surface of the beam plate and used for welding the lower end head of the steel lattice column (the back-jacking reinforcing column 3); after the concrete support beam 2 is poured, immediately welding and manufacturing a mounting steel lattice column (a back-jacking reinforcing column 3); after the steel lattice column (the back-jacking reinforcing column 3) is installed, backfilling earthwork in the middle of two beam plate supports, compacting by using machinery, and then backfilling, trimming and compacting the slope soil to form the unearthed slope 11. The lattice column and the beam slab support form an active load-reducing and unloading system to resist the self weight of the earthwork ramp and the load of the mud-headed vehicle.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention should be included within the scope of the present invention.

Claims (10)

1. The active unloading structure of the multi-support system deep foundation pit unearthing ramp is characterized by comprising support columns, support beams, back-jacking reinforcing columns and an unearthing ramp, wherein the support columns are vertically arranged in a foundation pit, the support beams are supported by the support columns, the support beams form a plurality of support layers, the back-jacking reinforcing columns are arranged between every two adjacent support layers, and the unearthing ramp is supported by an outer support body of the foundation pit and a first support layer and extends to the bottom of the foundation pit.
2. The active unloading structure of a multi-support system deep foundation pit unearthing ramp according to claim 1, wherein the back-jacking reinforcing columns are arranged between the supporting beams of the adjacent support layers, and the outer support bodies of the foundation pit are guide walls arranged outside the foundation pit.
3. The active unloading structure of a multi-support system deep foundation pit unearthing ramp according to claim 1, characterized in that the back-jacking reinforcing columns or/and the support columns are steel lattice columns.
4. The active unloading structure of a multi-support system deep foundation pit unearthed ramp according to claim 3, characterized in that steel plates are pre-embedded on the bottom and top surfaces of the adjacent support layers, and the top-returning reinforcing columns of the steel lattice structure are arranged between the two support layers through the steel plates connecting the top and bottom surfaces.
5. The active unloading structure of the multi-support system deep foundation pit unearthed ramp according to claim 4, characterized in that reinforcing ribs are further arranged at the joints of the back-jacking reinforcing columns and the steel plates of the steel lattice structure.
6. The active unloading structure of a multi-support system deep foundation pit unearthing ramp according to claim 3, characterized in that the support columns of the steel lattice structure are vertically arranged in the foundation pit through column piles, and the column piles are cast-in-place piles.
7. The active unloading structure of a multi-support system deep foundation pit unearthed ramp according to claim 3, characterized in that the steel lattice column comprises four angle steels and a plurality of gusset plates, the four angle steels are enclosed into a rectangular column, and adjacent angle steels are fixedly connected through the plurality of gusset plates arranged at intervals.
8. The active unloading structure of a multi-support system deep foundation pit unearthing ramp according to any one of claims 1 to 7, further comprising a crown beam and a wale, wherein the support beams of the support layers are supported between the crown beam and the support columns, or between the wale and the support columns, or between the support columns and the support columns.
9. The active unloading structure of a multi-support system deep foundation pit unearthing ramp according to any one of claims 1 to 7, wherein the support beams are arranged in a cross manner, and the support layers further comprise support plates arranged on the support beams.
10. The active unloading structure of the multi-support system deep foundation pit unearthing ramp according to any one of claims 1 to 7, characterized in that the unearthing ramp comprises a ramp plate, and backfill soil is filled below the ramp plate.
CN202020939323.8U 2020-05-28 2020-05-28 Active unloading structure of multi-support system deep foundation pit unearthing ramp Active CN212956543U (en)

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Application Number Priority Date Filing Date Title
CN202020939323.8U CN212956543U (en) 2020-05-28 2020-05-28 Active unloading structure of multi-support system deep foundation pit unearthing ramp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020939323.8U CN212956543U (en) 2020-05-28 2020-05-28 Active unloading structure of multi-support system deep foundation pit unearthing ramp

Publications (1)

Publication Number Publication Date
CN212956543U true CN212956543U (en) 2021-04-13

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