CN216640538U - Assembled prism supporting structure suitable for foundation engineering of foam light soil replacement and filling - Google Patents
Assembled prism supporting structure suitable for foundation engineering of foam light soil replacement and filling Download PDFInfo
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- CN216640538U CN216640538U CN202122678073.4U CN202122678073U CN216640538U CN 216640538 U CN216640538 U CN 216640538U CN 202122678073 U CN202122678073 U CN 202122678073U CN 216640538 U CN216640538 U CN 216640538U
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Abstract
The utility model discloses an assembled prism supporting structure suitable for foam light soil foundation-changing engineering, which is characterized in that an assembled prism supporting structure is adopted on one side of a foundation-changing processing area to be subjected to slope-releasing excavation, the structure consists of an upright template erected on the slope bottom of a slope and a plurality of straight prisms, each straight prism comprises a straight triangular prism body with a right-angled triangle bottom surface and a straight quadrangular prism body with a rectangular bottom surface, the inclination angle of the triangular bevel edge of the bottom surface of the straight triangular prism body is formed according to the slope-releasing gradient, and the inclined surface of the straight triangular prism body is attached to the slope surface. The stacked straight prisms form a prism integral supporting structure, and the top end of the prism integral supporting structure is horizontal and is as high as the top end of the upright template. The utility model is used for slope-laying excavation construction of foam light soil foundation-changing engineering, and can provide effective support for slope-laying construction.
Description
Technical Field
The utility model relates to the technical field of foundation treatment, in particular to an assembled prism supporting structure suitable for foundation engineering of foam light soil replacement and filling.
Background
The reconstruction and extension project for the offshore airport generally comprises a pavement structure project and a foundation treatment project of runway areas, such as runways, taxiways, crossing lanes and the like. However, the ground treatment project in the field area often involves areas with no navigation stop, limited high requirements, and areas covered with various underground pipelines such as fire fighting pipelines, power supply pipelines, navigation light pipelines, air traffic pipeline communication pipelines, security and protection pipelines, drainage pipelines, water supply pipelines, and the like.
The restriction time of the non-navigation-stop construction area is very strict, and the effective construction time is very short; moreover, the height-limited area generally has strict height-limiting requirements; in addition, the construction progress of the area covered by various underground pipelines is greatly influenced by the underground pipelines. In view of this, the drainage consolidation method and the general composite foundation treatment method (cement mixing pile method, PHC pipe pile method, high pressure jet grouting pile method, gravel pile method, etc.) are not suitable for the foundation treatment project of the offshore airport reconstruction and extension project, considering the construction work efficiency, height limit requirements, underground pipeline limitation, etc. comprehensively.
Therefore, the development of a soft foundation treatment technology suitable for the reconstruction and extension project of the offshore airport is urgently needed. In consideration of the difficulties and objective condition limitations of the soft foundation treatment engineering, the applicable supporting structure is also very critical.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a supporting structure suitable for soft foundation treatment engineering of offshore airport reconstruction and extension engineering.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the assembled prism supporting structure is suitable for foundation engineering of foam light soil replacement and filling, one side of a foundation treatment area to be subjected to slope excavation is provided with the assembled prism supporting structure, the assembled prism supporting structure is composed of an upright template erected on the slope bottom of a slope and a plurality of straight prisms, each straight prism comprises a straight triangular prism body with a right-angled triangle bottom surface and a straight quadrangular prism body with a rectangular bottom surface, the inclination angle of the triangular bevel edge of the bottom surface of the straight triangular prism body is manufactured and formed according to the slope of the slope, the inclined surface of the inclined surface is attached to the slope surface, the stacked straight prisms form an integrated prism supporting structure, and a fixed connecting mechanism is arranged between the horizontal top end of the integrated prism supporting structure and the connecting surface of the stacked straight prisms with the same height as the top end of the upright template so as to avoid mutual dislocation between the stacked straight prisms.
Specifically, the fixed connecting mechanism is arranged on the horizontal plane and the longitudinal side surface of the adjacent straight prism.
Preferably, the abutting surfaces of the stacked right prisms are fixedly connected by a double-faced claw-shaped connecting piece.
The utility model provides a supporting structure for slope-making excavation construction of foam light soil foundation-changing foundation engineering.
Drawings
Fig. 1 is a schematic plan view of a construction area of a field area-crossing road foam light soil reclamation.
FIG. 2 is a schematic diagram of the construction steps of the interlaced excavation method, wherein step a divides a to-be-constructed area into lines; b, carrying out foundation pit excavation construction in an interlaced mode, and using a vertical template and an assembled prism as foundation pit support; c, pouring foam light soil; step d, constructing the unfinished foundation pit; and e, paving a gravel cushion layer.
Wherein: 1-poor soil property (penetration number) of soil body within excavation range<4) An area; 2-the soil body in the excavation range has better soil property (penetration number)>4) An area; 3-subregion boundary; 4-steel sheet pile; 5, controlling the bottom elevation of the foundation pit; 6-geotextile; 7-erecting the template; 8-initial height marking of underground water level; 9-floating ball; 10-underwater foam light soil (volume weight of 11 kN/m)3) (ii) a 11-waterborne foam light soil (volume weight of 8 kN/m)3) (ii) a 12-a gravel cushion; 13-releasing a slope and excavating a line; 14-a right prism; 14.1-first right triangular prism; 14.2-a first rectilinear quadrangular prism; 14.3-a second straight quadrangular prism; 14.4-a second right triangular prism body; 15-top steel plate.
Fig. 3 is an assembled prism support structure according to the present invention.
Detailed Description
Fig. 1 is a schematic construction plan view of soft foundation treatment for the expansion project of the offshore airport. According to the soil property (standard penetration number) of the soil body in the excavation range, two different construction modes can be adopted, and the grid-shaped partition and the grid jumping excavation construction can be adopted when the standard penetration number is less than 4; and strip-shaped partitions with the standard penetration number greater than 4 can be adopted for alternate excavation construction.
As shown in fig. 2, a schematic diagram of construction steps of strip partition interlaced excavation construction is shown, and the construction steps are as follows:
(1) measuring and lofting an area to be subjected to soft foundation treatment, and preparing two kinds of foam light soil with different volume weights above and below water based on a preset construction matching proportion; because the underground water level in the coastal airport foundation is generally higher, the overwater foamed light soil is adopted above the underground water level, and the volume weight is 7-9 kN/m3(ii) a Underwater foam light soil is adopted below the underground water level, and the volume weight is 10-12 kN/m3And the underwater foamed light soil formula contains a plasticizer to prevent the segregation phenomenon.
(2) The soil property of the soil body in the excavation range is better (the penetration number of the standard soil)>4) Area 2 is divided into 100m2～300m2The strip sub-area is excavated by adopting an interlaced/row mode;
(3) before excavation of the foundation pit in the corresponding sub-area, not only the design of a foundation pit supporting structure needs to be carried out, but also the limit time and airworthiness recovery requirements of the non-navigation construction area and the height limit conditions of the height limit area need to be determined with an airport operation manager, and meanwhile, the distribution condition of underground pipelines needs to be found. Before and during excavation of the foundation pit in the corresponding sub-area, a drainage measure of the foundation pit needs to be made, and preparation work of the foam light soil, such as cement paste preparation, foam preparation, full-automatic mixing of foam and cement paste and the like, is carried out based on a preset construction mixing ratio.
For the interlaced foundation pit excavation mode, the section B-B excavation construction is shown in fig. 2, and the implementation is carried out according to the following steps:
(3.1) measuring and lofting the plane position of the steel sheet pile at the boundary of the strip-shaped subarea to be constructed;
(3.2) preparing U-shaped long and dense buckling Laulin steel sheet piles according to the designed quantity;
(3.3) preparing the crawler-type vibratory hammer pile driver in place;
(3.4) coating grease in the locking notch of the steel sheet pile;
and (3.5) supporting only the boundary of the strip sub-area to be subjected to soft foundation treatment by using a steel sheet pile 4, then performing slope releasing excavation along the long side direction of the strip sub-area by taking one side provided with the steel sheet pile support as an initial position, and designing the slope of the slope according to the soil property of an excavated soil layer. And a polystyrene plate with the thickness of 20-30 mm or a splint with the thickness of 10-20 mm is arranged on the inner side of the steel sheet pile and is used as a settlement joint filling material.
One side of the slope is provided with the assembled prism supporting structure, which comprises an upright template 7 erected at the slope bottom of the slope and a plurality of straight prisms 14 horizontally stacked on the slope surface. The right prisms include first and second right triangular prisms 14.1 and 14.4 having right triangle-shaped bottom surfaces, and first and second right quadrangular prisms 14.2 and 14.3 having rectangular bottom surfaces. The inclined angles of the triangular inclined edges of the bottom surfaces of the first right triangular prism 14.1 and the second right triangular prism 14.4 are manufactured and formed according to the slope of the slope, and the inclined surfaces of the inclined surfaces are attached to the corresponding slope surfaces. The length-width ratio and the height of the first straight quadrangular prism 14.2 and the second straight quadrangular prism 14.3 are determined according to actual requirements. The vertical prisms of various specifications are stacked together to form the prism integral supporting structure, and the top end of the prism integral supporting structure is horizontal and is as high as the top end of the vertical template.
The vertical template 7 and the prism 14 combined structure are used as a supporting structure during foam light soil filling, after a foundation pit is excavated to a control bottom elevation, a layer of geotextile 6 is laid, and a polystyrene plate is arranged on the inner side of the steel sheet pile 4 and used as a settlement joint filling material. The upstanding forms 7 may act as a sinker joint caulking material. The fabricated prism 14 is made of a dense material such as EPS material. The shape and the size of the prism body are designed according to the slope, the width and the height of the slope. The length of the prism is the same as the width of the strip-shaped subarea, one side surface of the prism is attached to the slope surface, and the outer side surface of the stacked prism is attached to the upright template;
in order to prevent the blocks from being staggered, double-sided claw-shaped connecting pieces are adopted among the layers of the stacked prism bodies, and single-sided claw-shaped connecting pieces are adopted on the top surface and the side surfaces, so that a good whole is formed with the vertical template;
on top of the uppermost layer of prism, a top steel plate 15 or precast concrete plate is fastened as counter pressure load.
After the foundation pit of the corresponding sub-area is excavated to the control bottom elevation 5, laying a layer of integral geotextile 6;
(4) placing a plurality of floating balls 9 at a certain distance from the two sides of the foundation pit of the corresponding sub-area to 1m from the inner side of the steel sheet pile enclosure structure 4, wherein the elevation of each floating ball 9 is equal to the initial elevation 8 of the underground water level in the soil layer;
(5) and filling foam light soil into the foundation pit of the corresponding sub-area to a designed elevation. The foam light soil filling construction is carried out according to the following steps:
(A) because underground water exists in the foundation pit, when the foamed light soil is poured through the pumping pipe, the pipe orifice is in a horizontal state and is always tangent to the surface of the light soil;
(B) and adopting a layered pouring construction sequence from bottom to top, and pouring the upper layer after the lower layer is finally set. During the pouring process, the underground water in the foundation pit can be lifted upwards due to 100% replacement of the foamed light soil; the volume weight of the underwater foamed light soil adopted below the underground water level is 10-12 kN/m3Preferably 11kN/m3. The underwater foamed light soil is prepared according to the following formula: 1m3The underwater foamed light soil is prepared from cement (42.5 grade) 0.68t and water 0.41m30.80kg of foaming agent and 0.08kg of plasticizer (fatty acid waterproof agent) are evenly stirred and prepared.
(C) When the underground water level exceeds the elevation of the floating ball 9, the water suction pump is started to pump water, so that the floating ball is always kept at the original underground water level 8.
(D) And leading the pumped water to a pulp returning ditch, and uniformly discharging the water to a water discharging open ditch in the airport after the water is precipitated.
(E) And when the foam light soil is poured to the in-situ water level position 8, replacing the foam light soil with the water foam light soil until the foam light soil is poured to the designed top surface elevation. The volume weight of the waterborne foamed light soil is 7-9 kN/m3Preferably 8kN/m3. The waterborne foam light soil is prepared according to the following formula: 1m3The water foamed light soil is prepared from cement (42.5 grade) 0.55t and water 0.33m30.90kg of foaming agent is evenly stirred and prepared;
(6) the top layer steel sheet piles 15 (or precast concrete plates) are sequentially paved on the tops of foundation pits of corresponding sub-areas so as to meet the seaworthiness recovery requirement of a non-navigation construction area;
(7) and after the foam light soil of the corresponding sub-area reaches the design strength, removing the top steel sheet pile 15 (or the precast concrete slab) paved on the top of the pit, and paving a layer of integral high-strength geotextile 6. Because the underground water level in the foundation of the offshore airport is generally higher, the 28d unconfined compressive strength of the foamed light soil 10 above the underground water level 8 is not lower than 2.5MPa, and the 28d unconfined compressive strength of the foamed light soil 11 below the underground water level 8 is not lower than 3.5 MPa;
(8) removing the steel sheet pile enclosure structure 4 of the corresponding sub-area by adopting a crawler-type vibrating hammer pile extractor, and using the steel sheet pile enclosure structure 4 for the foundation pit supporting construction of the next group of sub-areas;
(9) paving a broken stone cushion layer 12 in the corresponding sub-area according to the designed thickness, and rolling and leveling to the foundation treatment cross elevation;
(14) and (4) replacing and filling the foamed light soil in the next group of subareas in the same steps (3) - (9).
Claims (4)
1. The assembled prism supporting structure is suitable for the foundation engineering of foam light soil reclamation, and the assembled prism supporting structure is adopted on one side of the planned slope excavation in the foundation reclamation processing area, and is characterized in that: the assembled prism supporting structure is composed of an upright template and a plurality of straight prisms, the upright template is upright on the slope bottom of the slope, the straight prisms comprise straight triangular prisms with right-angled triangles on the bottom surfaces and straight quadrangular prisms with rectangular bottom surfaces, the inclination angles of triangular bevel edges on the bottom surfaces of the straight triangular prisms are manufactured and formed according to the slope of the slope, the inclined surfaces of the inclined prisms are attached to the slope surface, the stacked straight prisms form a prism integral supporting structure, and the top end of the prism integral supporting structure is horizontal and is as high as the top end of the upright template.
2. The fabricated prism support structure suitable for foam lightweight soil reclamation ground engineering according to claim 1, wherein: the fixed connecting mechanism is arranged between the joint surfaces of the stacked right prisms.
3. The fabricated prism supporting structure suitable for foam light soil foundation-changing engineering according to claim 2, wherein: the fixed connecting mechanism is arranged on the horizontal plane and the longitudinal side surface of the adjacent straight prism.
4. The fabricated prism supporting structure suitable for foam light soil foundation-changing engineering according to claim 2, wherein: the joint surfaces of the stacked right prisms are fixedly connected by a double-faced claw-shaped connecting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122678073.4U CN216640538U (en) | 2021-11-03 | 2021-11-03 | Assembled prism supporting structure suitable for foundation engineering of foam light soil replacement and filling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122678073.4U CN216640538U (en) | 2021-11-03 | 2021-11-03 | Assembled prism supporting structure suitable for foundation engineering of foam light soil replacement and filling |
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| Publication Number | Publication Date |
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| CN216640538U true CN216640538U (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122678073.4U Active CN216640538U (en) | 2021-11-03 | 2021-11-03 | Assembled prism supporting structure suitable for foundation engineering of foam light soil replacement and filling |
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2021
- 2021-11-03 CN CN202122678073.4U patent/CN216640538U/en active Active
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