CN210712864U - Deep foundation pit supporting system of Larsen steel sheet pile and cement mixing pile for soft soil field - Google Patents
Deep foundation pit supporting system of Larsen steel sheet pile and cement mixing pile for soft soil field Download PDFInfo
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- CN210712864U CN210712864U CN201921189043.3U CN201921189043U CN210712864U CN 210712864 U CN210712864 U CN 210712864U CN 201921189043 U CN201921189043 U CN 201921189043U CN 210712864 U CN210712864 U CN 210712864U
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- 239000004568 cement Substances 0.000 title claims abstract description 267
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 249
- 239000010959 steel Substances 0.000 title claims abstract description 249
- 239000002689 soil Substances 0.000 title claims abstract description 63
- 239000010410 layer Substances 0.000 description 55
- 238000010276 construction Methods 0.000 description 24
- 238000000034 method Methods 0.000 description 24
- 238000009412 basement excavation Methods 0.000 description 9
- 239000011083 cement mortar Substances 0.000 description 8
- 230000004888 barrier function Effects 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The deep foundation pit supporting system for the Larsen steel sheet piles and the cement mixing piles in the soft soil field comprises an outer Larsen steel sheet pile enclosure, a first cement mixing pile enclosure among the steel sheet piles, an inner Larsen steel sheet pile enclosure, a horizontal foundation pit support, a second cement mixing pile enclosure serving as a waterproof curtain and a third cement mixing pile grid body in the curtain. Use the utility model discloses, engineering cost is little and the bulk rigidity is big.
Description
Technical Field
The utility model belongs to underground structure engineering field relates to a dark excavation supporting system of larsen steel sheet pile and cement mixing stake for weak soil place.
Background
In recent years, with the increasing strengthening and upgrading of the construction strength of cities and towns and industrial underground infrastructures in China, deep underground facilities (buildings) are constructed in the limited construction land range of the existing cities and towns and industrial bases, and the construction field is concerned more and more. Especially in cities and towns and industrial bases with dense buildings on the coast of the Yangtze river, the upper parts of the foundations in the areas are often formed by stacking deep and soft alluvial soil layers, the underground water level is high, and the underground water level is generally about 0-1.0 m below the ground all year round. In the above-mentioned areas, how to construct underground facilities (buildings) on limited narrow and small sites with densely arranged surrounding structures, and to overcome the adverse effect of the construction of medium-large deep underground facilities (buildings) on the surrounding structures, and to reduce the construction cost as much as possible is the subject of continuous research and study by the majority of engineering technicians.
Through accumulation and development of engineering experience for decades, China forms various mature deep foundation pit supporting construction methods. For a high-groundwater-level weak soil field, three methods are mainly used, namely a pile arrangement method, an underground continuous wall method and a steel sheet pile support method.
In order to enable the rigidity of the supporting structure to meet the requirements, the supporting structure formed by the pile arranging method and the underground diaphragm wall method needs to arrange cement mixing piles in the deep foundation pit in a full-scale mode, and needs to arrange high-pressure jet grouting pile back covers in the deep foundation pit bottom in a full-scale mode, so that the engineering cost is high. The steel sheet pile supporting method is generally a supporting structure formed by single-layer steel sheet piles, the rigidity of the supporting side wall is low, the arrangement interval of horizontal supports required in a pit is dense, and the applicable depth of a foundation pit is small.
In addition, the single-layer steel sheet pile has low rigidity in the traditional steel sheet pile supporting method, and the depth of a foundation pit supported by the single-layer steel sheet pile is not too large for a weak soil field. And the inserted sheet junction often has little gap between each steel sheet pile piece, and groundwater goes deep into the foundation ditch through the gap easily, and waterproof performance is poor, and then causes the peripheral soil body of foundation ditch to subside, can cause secondary harm to peripheral building, structures.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, overcome prior art and have above-mentioned not enough, provide a dark excavation supporting system of larsen steel sheet pile and cement stirring stake for the weak soil place that engineering cost is little and the bulk rigidity is big.
The utility model provides a technical scheme that its technical problem adopted is:
the deep foundation pit supporting system for the Larsen steel sheet piles and the cement mixing piles for the weak soil field comprises an outer Larsen steel sheet pile enclosure, a first cement mixing pile enclosure among the steel sheet piles, an inner Larsen steel sheet pile enclosure, a horizontal foundation pit support, a second cement mixing pile enclosure used as a waterproof curtain and a third cement mixing pile grid body in the curtain; the first cement mixing pile enclosure among the steel plate piles is arranged between the outer layer Larsen steel plate pile enclosure and the inner layer Larsen steel plate pile enclosure, the outer layer Larsen steel plate pile enclosure is an annular enclosure defined by a plurality of outer layer Larsen steel plate piles which are arranged at equal intervals, and the inner layer Larsen steel plate pile enclosure is an annular enclosure defined by a plurality of inner layer Larsen steel plate piles which are arranged at equal intervals; the outer Larsen steel sheet pile enclosure is arranged on the outer side of a first cement mixing pile enclosure among the steel sheet piles and clings to the outer side face of the first cement mixing pile enclosure among the steel sheet piles, the inner Larsen steel sheet pile enclosure and a second cement mixing pile enclosure used as a waterproof curtain are both arranged on the inner side of the first cement mixing pile enclosure among the steel sheet piles, and the inner Larsen steel sheet pile enclosure and the second cement mixing pile enclosure used as the waterproof curtain cling to the inner side face of the first cement mixing pile enclosure among the steel sheet piles from top to bottom in sequence; the lower part of the inner Larsen steel sheet pile enclosure is inserted into a second cement mixing pile enclosure used as a waterproof curtain; a second cement mixing pile enclosure used as a waterproof curtain and a third cement mixing pile grid body in the curtain are arranged below the ground; the lower part of the outer Larsen steel sheet pile enclosure is inserted into the ground, the depth of the outer Larsen steel sheet pile enclosure inserted into the ground is larger than the depth of the top surface of a second cement mixing pile enclosure used as a waterproof curtain and the depth of the top surface of a third cement mixing pile grid body in the curtain, namely the bottom surface of the outer Larsen steel sheet pile is lower than the top surface of the second cement mixing pile enclosure used as the waterproof curtain and the top surface of the third cement mixing pile grid body in the curtain; the second cement mixing pile enclosure used as a waterproof curtain is formed by 1-5 circles of second cement mixing piles which are mutually overlapped without gaps, and the first cement mixing pile enclosure among the steel plate piles is formed by a circle of first cement mixing piles which are mutually overlapped without gaps; the second cement mixing pile at the outermost ring of the second cement mixing pile enclosure used as the waterproof curtain is in gapless lap joint with the first cement mixing pile adjacent to the second cement mixing pile enclosure; a third cement mixing pile grid body in the curtain is arranged in an surrounded area of the second cement mixing pile at the innermost ring of the second cement mixing pile surrounding baffle; the third cement mixing pile grid body in the curtain comprises transverse grid strips and longitudinal grid strips, the transverse grid strips are transversely arranged, the longitudinal grid strips are longitudinally arranged, the transverse grid strips and the longitudinal grid strips are vertically arranged to form hollow grids, and the transverse grid strips and the longitudinal grid strips are formed by a plurality of third cement mixing piles which are mutually in gapless lap joint; the second cement mixing pile at the innermost ring of the second cement mixing pile enclosure is in gapless lap joint with the third cement mixing pile adjacent to the second cement mixing pile; the end part of the horizontal support of the foundation pit is propped against the inner side surface of the inner Larsen steel sheet pile enclosure.
Further, the pile diameter of the second cement mixing pile is 300-1000 mm; the adjacent second cement mixing piles in the same circle are in gapless lap joint, and the radial lap joint length between the adjacent second cement mixing piles in the same circle is 150-300 mm; and the adjacent second cement mixing piles positioned in different circles are also in gapless lap joint, and the radial lap joint length between the adjacent second cement mixing piles positioned in different circles is 150-300 mm. When the second cement mixing pile at the outermost ring is in gapless lap joint with the first cement mixing pile adjacent to the second cement mixing pile, the radial lap joint length is 150-300 mm. When the second cement mixing pile at the innermost circle and the third cement mixing pile adjacent to the second cement mixing pile are in gapless lap joint, the radial lap joint length is 150-300 mm.
Further, the lower part of the first cement mixing pile enclosure between the steel plate piles and the lower part of the second cement mixing pile enclosure used as the waterproof curtain are inserted into the weak permeable soil layer. And a gap is formed between the bottom surface of the third cement mixing pile grid body in the curtain and the top surface of the weak permeable soil layer.
Further, the height of a gap between the bottom surface of the grid body of the third cement mixing pile in the curtain and the top surface of the weak permeable soil layer is 1/2-1/3 of the height of the grid body of the third cement mixing pile in the curtain.
Further, the pile diameter of the third cement mixing pile is 300-800 mm, and the radial overlap length when the adjacent third cement mixing piles are overlapped without gaps is 150-300 mm. The cross section of a hollow area of the hollow grids formed by vertically arranging the transverse grid bars and the longitudinal grid bars is square, the side length of the square is 3D-5D, and D is the distance between the central points of the adjacent third cement mixing piles.
Furthermore, the cross section of the outer Larsen steel sheet pile enclosure is wavy, the cross section of the inner Larsen steel sheet pile enclosure is also wavy, the outer Larsen steel sheet pile forming the outer Larsen steel sheet pile enclosure and the inner Larsen steel sheet pile forming the inner Larsen steel sheet pile enclosure are arranged oppositely, namely, the wave crest of the outer Larsen steel sheet pile enclosure with the wavy cross section corresponds to the wave crest of the inner Larsen steel sheet pile enclosure with the wavy cross section, and the wave trough of the outer Larsen steel sheet pile enclosure with the wavy cross section corresponds to the wave trough of the inner Larsen steel sheet pile enclosure with the wavy cross section. The distance between the wave trough of the outer Larsen steel sheet pile enclosure with the wavy section and the wave trough of the inner Larsen steel sheet pile enclosure with the wavy section is 300-1000 mm.
Further, the pile diameter of the first cement mixing pile forming the first cement mixing pile enclosure between the steel plate piles is 300-1000 mm, and the radial lap joint length between the adjacent first cement mixing piles is 150-300 mm.
Furthermore, the depth of the lower part of the Larsen steel sheet pile enclosure forming the inner layer inserted into the second cement mixing pile enclosure serving as a waterproof curtain is 500-1500 mm.
Further, the horizontal support of the foundation pit can comprise a transverse horizontal support, a longitudinal horizontal support and an oblique horizontal support, the transverse horizontal support and the longitudinal horizontal support are vertically arranged, two ends of the transverse horizontal support respectively abut against different inner-layer Larsen steel sheet piles, two ends of the longitudinal horizontal support also respectively abut against different inner-layer Larsen steel sheet piles, and two ends of the oblique horizontal support respectively abut against the longitudinal horizontal support and the transverse horizontal support. The horizontal support of the foundation pit is of a steel structure and can also be of a reinforced concrete structure.
Furthermore, cement mortar is filled in gaps between adjacent outer Larsen steel sheet piles forming the outer Larsen steel sheet pile enclosure and gaps between adjacent inner Larsen steel sheet piles forming the inner Larsen steel sheet pile enclosure through a pressure grouting method, so that the lateral rigidity and integrity of the whole supporting system are enhanced, and water outside the outer Larsen steel sheet pile enclosure is prevented from entering a foundation pit. The reinforcing steel bars are inserted into the first cement mixing piles forming the enclosure of the first cement mixing piles among the steel plate piles, so that the strength and toughness of the first cement mixing piles are enhanced, and the lateral rigidity of the whole supporting system is enhanced. The lower part of the outer Larsen steel sheet pile enclosure is inserted into the ground, and cement mortar can be poured into the soil body of the lower section of the outer side of the outer Larsen steel sheet pile enclosure by adopting a pressure grouting method, so that the strength of the soil body in the area can be enhanced, and the outer Larsen steel sheet pile enclosure is prevented from warping in the area. The pressure grouting method is the existing mature grouting method.
Further, the top surface that the fender is enclosed to outer Larsen steel sheet pile, the top surface that first cement mixing stake encloses the fender between the steel sheet pile, the top surface that inlayer Larsen steel sheet pile encloses the fender is on same horizontal plane, the top surface that outer Larsen steel sheet pile encloses the fender, the top surface that first cement mixing stake encloses the fender between the steel sheet pile, still can establish the interim crown beam of round on the top surface that inlayer Larsen steel sheet pile encloses the fender, interim crown beam can be reinforced concrete or steel construction, in order to do benefit to the wholeness of reinforcing excavation supporting system, alleviate the damage of construction facilities to supporting the system top during the construction.
The utility model discloses a construction method of dark excavation supporting system of larsen steel sheet pile and cement mixing pile for soft soil place does:
1) and (4) cleaning surface layer building garbage and waste underground facilities of the soft soil field, and leveling the soft soil field.
2) And paying off and positioning the position of the outer Larsen steel sheet pile according to a design construction drawing. And inserting the Larsen steel sheet piles at the outer layer one by one to the designed depth according to the paying-off position.
3) After the construction of the outer Larsen steel sheet pile is finished, a first cement mixing pile and a second cement mixing pile are constructed to the designed depth along the circumferential inner side of the outer Larsen steel sheet pile in the enclosed field, and the first cement mixing pile and the second cement mixing pile are extended into the weak permeable soil layer. And when the first cement mixing pile and the second cement mixing pile are constructed, inserting the Larsen steel plate pile at the inner layer to the designed depth position in the second cement mixing pile piece by piece before the cement final setting of the constructed first cement mixing pile is finished.
4) And after the first cement mixing pile, the second cement mixing pile and the inner layer Larsen steel plate pile are completely constructed, arranging a third cement mixing pile in the second cement mixing pile.
5) After the strength of the first cement mixing pile reaches 80%, excavating foundation soil in an area surrounded by the Larsen steel sheet pile of the inner layer by layer according to design requirements, and meanwhile erecting horizontal supports of the foundation pit layer by layer from top to bottom. After the last layer of foundation pit horizontal support is erected, continuously excavating the foundation pit to the top surface of the second cement mixing pile; finally, the utility model is a deep foundation pit supporting system of the larsen steel sheet pile-cement mixing pile in the soft soil field.
6) After the step 5), cement mortar can be poured and filled into the gaps between the adjacent outer Larsen steel sheet piles and the gaps between the adjacent inner Larsen steel sheet piles by a pressure grouting method, so that the lateral rigidity and the integrity of the support system can be enhanced; and (3) pouring cement mortar into the soil body at the lower section of the outer side of the outer layer Larsen steel sheet pile by adopting a pressure grouting method, so that the strength of the soil body in the area is enhanced, and the outer layer Larsen steel sheet pile is prevented from warping in the area.
The utility model discloses in, first cement stirring stake encloses to keep off locates that outer Larsen steel sheet stake encloses to keep off and inlayer Larsen steel sheet stake encloses between the fender, first cement stirring stake encloses to keep off between the steel sheet stake, outer Larsen steel sheet stake encloses to keep off and inlayer Larsen steel sheet stake encloses the holistic anti side of keeping off rigidity far away than two inside and outside single steel sheet stakes (or two inside and outside Larsen steel sheet stake enclose the fender) simple arithmetic stack of rigidity of moving of anti side for it is strong to strut system's bulk rigidity, is applicable to the deep basal pit in soft soil place. Through the first cement mixing pile enclosure between the steel plate piles arranged between the outer layer Larsen steel plate pile enclosure and the inner layer Larsen steel plate pile enclosure, the pile spacing between the outer layer Larsen steel plate pile and the inner layer Larsen steel plate pile can be kept relatively stable during foundation pit construction and use. Meanwhile, under the action of lateral soil pressure and the counter force of the horizontal support of the foundation pit, the outer contact surface of the outer Larsen steel sheet pile enclosure and the first cement mixing pile enclosure between the steel sheet piles and the inner contact surface of the inner Larsen steel sheet pile enclosure and the first cement mixing pile enclosure between the steel sheet piles form a sliding trend, longitudinal friction force is formed on the outer wall surface of the outer Larsen steel sheet pile enclosure and the inner wall surface of the inner Larsen steel sheet pile enclosure, and the outer Larsen steel sheet pile enclosure and the inner Larsen steel sheet pile enclosure generate synchronous deformation coordination through the conduction of the friction force, so that the integral coordination function of the outer Larsen steel sheet pile enclosure, the inner Larsen steel sheet pile enclosure and the first cement mixing pile enclosure between the steel sheet piles corresponding to wave crests and wave troughs is exerted, the wave troughs and the whole coordination function of the outer Larsen steel sheet pile enclosure, and the first cement mixing pile enclosure between the steel sheet piles are exerted fully, and a lateral movement resisting foundation pit supporting system with high rigidity can be, the whole supporting system is further suitable for deep foundation pits of weak soil sites. The depth of inserting into the ground of outer Larsen steel sheet pile enclosure is both greater than the top surface place degree of depth that is used as the second cement mixing pile enclosure of waterproof curtain, and be greater than the top surface place degree of depth of third cement mixing pile grid body in the curtain again, and the lower part of inner Larsen steel sheet pile enclosure inserts in the second cement mixing pile enclosure that is used as waterproof curtain, the problem of current steel sheet pile bottom anchor and lateral support structure foundation ditch bottom surface department stake cement mixing pile shear resistance not enough has been solved, strengthen the rigidity of whole payment system, make whole support system further be applicable to the deep basal pit in soft soil place again.
A first cement mixing pile enclosure among the steel plate piles, an inner Larsen steel plate pile enclosure and a second cement mixing pile enclosure used as a waterproof curtain form a firm lateral waterproof barrier, no gap exists on the lateral waterproof barrier, underground water at the periphery of the lateral waterproof barrier is difficult to enter a foundation pit, soil bodies at the periphery of the foundation pit are not caused to settle, and secondary damage to peripheral buildings and structures is avoided; and the lateral waterproof barrier is combined with the weak permeable soil layer to jointly form an underground box-type impermeable space, and the support system has good waterproof performance and creates basic conditions for excavation construction of dry operation of the foundation pit. In the excavation and use process of a foundation pit, in order to prevent the embedding instability failure of the second cement mixing pile enclosure used as a waterproof curtain and the anti-sliding stability failure of the weakly permeable soil layer, a third cement mixing pile grid body in the curtain is arranged in the second cement mixing pile enclosure used as the waterproof curtain, and the two instability can be effectively prevented by depending on the horizontal resistance and the shearing resistance of the third cement mixing pile grid body in the curtain, so that the stability and the reliability of an underground box type impermeable space are ensured, and the feasibility and the safety of the excavation construction of the foundation pit are ensured.
Use the utility model discloses, solved under the weak soil site condition, the problem of deep basal pit support construction difficulty. For current general steel sheet pile method, the utility model discloses a support the whole rigidity of system strong, waterproof performance is good, and it is big to use the foundation ditch degree of depth. For foundation ditch support construction methods such as current row's pile method, underground diaphragm wall method, use the utility model discloses a when strutting the system, the horizontal grid strip and the vertical grid strip of third cement mixing pile grid body arrange perpendicularly in the curtain and form the fretwork net, when whole payment system rigidity satisfies the demand, need not to arrange third cement mixing pile in the foundation ditch all over to do benefit to and reduce engineering cost. And a gap is formed between the bottom surface of the third cement mixing pile grid body in the curtain and the top surface of the weak permeable soil layer, and the bottom of the foundation pit does not need to be fully provided with a high-pressure jet grouting pile back cover, so that the engineering cost is further reduced. Use the utility model discloses, strut the system main part and adopt Larsen steel sheet pile and cement mixing stake, it is little to have the construction noise, and dust and mud pollute few characteristics, influence little characteristics to all ring edge borders.
Drawings
FIG. 1 is a schematic elevation view of a deep foundation pit supporting system of Larsen steel sheet piles and cement mixing piles for soft soil sites;
FIG. 2 is a schematic cross-sectional view of a deep foundation pit supporting system of the weak soil field shown in FIG. 1, wherein the deep foundation pit supporting system comprises Larsen steel sheet piles and cement mixing piles;
FIG. 3 is a schematic DD sectional view of a deep foundation pit supporting system of the weak soil field shown in FIG. 1 by Larsen steel sheet piles and cement mixing piles;
fig. 4 is a schematic sectional view of the deep foundation pit supporting system EE using the larsen steel sheet pile and the cement mixing pile for the soft soil field shown in fig. 1.
In the figure: 1-outer Larsen steel sheet pile surrounding baffle, 2-inner Larsen steel sheet pile surrounding baffle, 3-first cement mixing pile surrounding baffle between steel sheet piles, 4-second cement mixing pile surrounding baffle used as waterproof curtain, 5-third cement mixing pile grating body in the curtain, and 6-foundation pit horizontal support; 6-1, horizontally supporting in the transverse direction; 6-2, longitudinally and horizontally supporting; 6-3, obliquely and horizontally supporting; a, a gap between adjacent outer Larsen steel sheet piles; b, a gap between adjacent inner Larsen steel sheet piles; a, the top surface (the designed bottom elevation of the foundation pit) of a waterproof curtain of a second cement mixing pile; b, a weak permeable soil layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1-4, the deep foundation pit supporting system for the Larsen steel sheet piles and the cement mixing piles in the soft soil field comprises an outer Larsen steel sheet pile enclosure 1, a first cement mixing pile enclosure 3 among the steel sheet piles, an inner Larsen steel sheet pile enclosure 2, a foundation pit horizontal support 6, a second cement mixing pile enclosure 4 used as a waterproof curtain and a third cement mixing pile grid body 5 in the curtain. The steel plate inter-pile first cement mixing pile enclosure 3 is arranged between an outer layer Larsen steel plate pile enclosure 1 and an inner layer Larsen steel plate pile enclosure 2, the outer layer Larsen steel plate pile enclosure 1 is an annular enclosure defined by a plurality of outer layer Larsen steel plate piles in an equidistant arrangement, and the inner layer Larsen steel plate pile enclosure 2 is an annular enclosure defined by a plurality of inner layer Larsen steel plate piles in an equidistant arrangement; the outer Larsen steel sheet pile enclosure 1 is arranged on the outer side of a first cement mixing pile enclosure 3 among the steel sheet piles and clings to the outer side face of the first cement mixing pile enclosure 3 among the steel sheet piles, the inner Larsen steel sheet pile enclosure 2 and a second cement mixing pile enclosure 4 used as a waterproof curtain are both arranged on the inner side of the first cement mixing pile enclosure 3 among the steel sheet piles, and the inner Larsen steel sheet pile enclosure 2 and the second cement mixing pile enclosure 4 used as the waterproof curtain cling to the inner side face of the first cement mixing pile enclosure 3 among the steel sheet piles from top to bottom in sequence; the lower part of the inner Larsen steel sheet pile enclosure 2 is inserted into a second cement mixing pile enclosure 4 used as a waterproof curtain; a second cement mixing pile enclosure 4 used as a waterproof curtain and a third cement mixing pile grid body 5 in the curtain are arranged below the ground; the lower part of the outer Larsen steel sheet pile enclosure 1 is inserted into the ground, the depth of the outer Larsen steel sheet pile enclosure 1 inserted into the ground is larger than the depth of the top surface of a second cement mixing pile enclosure 4 used as a waterproof curtain and the depth of the top surface of a third cement mixing pile grid body 5 in the curtain, namely the bottom surface of the outer Larsen steel sheet pile 1 is lower than the top surface of the second cement mixing pile enclosure 4 used as the waterproof curtain and the top surface of the third cement mixing pile grid body 5 in the curtain; the second cement mixing pile surrounding baffle 4 used as a waterproof curtain is composed of two circles of second cement mixing piles which are mutually overlapped without gaps, and the first cement mixing pile surrounding baffle 3 between the steel plate piles is composed of one circle of first cement mixing piles which are mutually overlapped without gaps; the second cement mixing pile at the outermost ring is in gapless lap joint with the first cement mixing pile adjacent to the second cement mixing pile; a third cement mixing pile grid body 5 in the curtain is arranged in the surrounding area of the second cement mixing pile at the innermost circle; the third cement mixing pile grid body 5 in the curtain comprises transverse grid strips and longitudinal grid strips, the transverse grid strips are transversely arranged, the longitudinal grid strips are longitudinally arranged, the transverse grid strips and the longitudinal grid strips are vertically arranged to form hollow grids, and the transverse grid strips and the longitudinal grid strips are formed by a plurality of third cement mixing piles which are mutually in gapless lap joint. The second cement mixing pile at the innermost circle is in gapless lap joint with the third cement mixing pile adjacent to the second cement mixing pile; the end part of the foundation pit horizontal support 6 is propped against the inner side surface of the inner Larsen steel sheet pile enclosure 2.
In this embodiment, the pile diameter of the second cement mixing pile is 800 mm; the adjacent second cement mixing piles in the same circle are in gapless lap joint, and the radial lap joint length between the adjacent second cement mixing piles in the same circle is 200 mm; and the adjacent second cement mixing piles positioned in different circles are also in gapless lap joint, and the radial lap joint length between the adjacent second cement mixing piles positioned in different circles is 200 mm. When the second cement mixing pile at the outermost ring is in gapless lap joint with the first cement mixing pile adjacent to the second cement mixing pile, the radial lap joint length is 200 mm. When the second cement mixing pile at the innermost circle and the third cement mixing pile adjacent to the second cement mixing pile are in gapless lap joint, the radial lap joint length is 200 mm.
In this embodiment, the pile diameter of the third cement mixing pile is 800mm, and the radial overlap length when the adjacent third cement mixing piles are overlapped without a gap is 200 mm. The transverse grid bars and the longitudinal grid bars are vertically arranged to form square hollow grids.
The lower part of the first cement mixing pile enclosure 3 among the steel plate piles and the lower part of the second cement mixing pile enclosure 4 serving as a waterproof curtain are inserted into the weak permeable soil layer b. A gap is formed between the bottom surface of the third cement mixing pile grid body 5 in the curtain and the top surface of the weak permeable soil layer b. The height of a gap between the bottom surface of the third cement mixing pile grid body 5 in the curtain and the top surface of the weak permeable soil layer b is 1/2 which is the height of the third cement mixing pile grid body 5 in the curtain.
The top surface of the second cement mixing pile fence 4 used as a waterproof curtain and the top surface of the third cement mixing pile grid body 5 in the curtain are on the same horizontal plane. The bottom surface of the first cement mixing pile fence 3 between the steel plate piles and the bottom surface of the second cement mixing pile fence 4 serving as a waterproof curtain are on the same horizontal plane. The bottom surface of the grid body 5 of the third cement mixing piles in the curtain is higher than the bottom surface of the fence 4 of the second cement mixing piles used as a waterproof curtain.
The cross section of the outer Larsen steel sheet pile surrounding baffle 1 is wavy, the cross section of the inner Larsen steel sheet pile surrounding baffle 2 is also wavy, the outer Larsen steel sheet pile forming the outer Larsen steel sheet pile surrounding baffle 1 and the inner Larsen steel sheet pile forming the inner Larsen steel sheet pile surrounding baffle 2 are arranged oppositely, namely the wave crest of the outer Larsen steel sheet pile surrounding baffle 1 with the wavy cross section corresponds to the wave crest of the inner Larsen steel sheet pile surrounding baffle 2 with the wavy cross section, and the wave trough of the outer Larsen steel sheet pile surrounding baffle 1 with the wavy cross section corresponds to the wave trough of the inner Larsen steel sheet pile surrounding baffle 2 with the wavy cross section. The distance between the wave trough of the outer Larsen steel sheet pile enclosure 1 with the wavy section and the wave trough of the inner Larsen steel sheet pile enclosure 2 with the wavy section is 300-1000 mm.
The pile diameter (pile diameter refers to the diameter of the cross section of the pile) of the first cement mixing pile 3 forming the first cement mixing pile enclosure 3 among the steel plate piles is 600mm, and the radial lap joint length between the adjacent first cement mixing piles 3 is 200 mm.
Herein, the radial overlap length between two adjacent piles refers to the maximum overlapping length of two adjacent piles in the diameter direction.
The depth of the lower part constituting the inner Larsen steel sheet pile surround 2 inserted into the second cement mixing pile surround 4 serving as a waterproof curtain is 1500 mm.
The foundation pit horizontal support 6 can comprise a transverse horizontal support 6-1, a longitudinal horizontal support 6-2 and an oblique horizontal support 6-3, the transverse horizontal support 6-1 and the longitudinal horizontal support 6-2 are vertically arranged, two ends of the transverse horizontal support 6-1 respectively abut against different inner-layer Larsen steel sheet piles, two ends of the longitudinal horizontal support 6-2 also respectively abut against different inner-layer Larsen steel sheet piles 2, and two ends of the oblique horizontal support 6-3 respectively abut against the longitudinal horizontal support 6-2 and the transverse horizontal support 6-1. The foundation pit horizontal support 6 is of a steel structure and can also be of a reinforced concrete structure. In this embodiment, the deep foundation pit supporting system may be provided with two layers of foundation pit horizontal supports 6, and the structures of each layer of foundation pit horizontal support 6 are the same.
In the gaps (namely the positions marked by the marks A in the drawing) between the adjacent outer Larsen steel plate piles forming the outer Larsen steel plate pile enclosure 1 and in the gaps (namely the positions marked by the marks B in the drawing) between the adjacent inner Larsen steel plate piles forming the inner Larsen steel plate pile enclosure 2, cement mortar is filled in the gaps through a pressure grouting method, so that the lateral rigidity and the integrity of the whole supporting system are enhanced. The reinforcing steel bars are inserted into the first cement mixing piles forming the first cement mixing piles enclosing barrier 3 among the steel plate piles, so that the strength and toughness of the first cement mixing piles 3 are enhanced, and the lateral rigidity of the whole supporting system is enhanced. The lower part of the outer Larsen steel plate pile enclosure 1 is inserted into the ground, cement mortar can be poured into the soil body of the lower section of the outer side of the outer Larsen steel plate pile enclosure 1 by adopting a pressure grouting method, so that the strength of the soil body in the area can be enhanced, and the outer Larsen steel plate pile enclosure 1 is prevented from warping in the area. The pressure grouting method is the existing mature grouting method.
Outer larsen steel sheet pile encloses the top surface that keeps off 1, the top surface that first cement mixing stake encloses fender 3 between the steel sheet pile, the top surface that inlayer larsen steel sheet pile encloses fender 2 is on same horizontal plane, the top surface that outer larsen steel sheet pile encloses fender 1, the top surface that first cement mixing stake encloses fender 3 between the steel sheet pile, still can establish the interim crown beam of round (not shown in the figure) on the top surface that inlayer larsen steel sheet pile encloses fender 2, interim crown beam can be reinforced concrete or steel construction, in order to do benefit to the wholeness of reinforcing excavation supporting system, alleviate the damage of construction facilities to supporting the system top during the construction.
The utility model discloses a construction method of dark excavation supporting system of larsen steel sheet pile and cement mixing pile for soft soil place does:
1) and (4) cleaning surface layer building garbage and waste underground facilities of the soft soil field, and leveling the soft soil field.
2) And paying off and positioning the position of the outer Larsen steel sheet pile according to a design construction drawing. And inserting the Larsen steel sheet piles at the outer layer one by one to the designed depth according to the paying-off position.
3) After the construction of the outer Larsen steel sheet pile is finished, a first cement mixing pile and a second cement mixing pile are constructed to the designed depth along the circumferential inner side of the outer Larsen steel sheet pile in the enclosed field, and the first cement mixing pile and the second cement mixing pile are extended into the weak permeable soil layer b. And when the first cement mixing pile and the second cement mixing pile are constructed, inserting the Larsen steel plate pile at the inner layer to the designed depth position in the second cement mixing pile piece by piece before the cement final setting of the constructed first cement mixing pile is finished.
4) And after the first cement mixing pile, the second cement mixing pile and the inner layer Larsen steel plate pile are completely constructed, arranging a third cement mixing pile in the second cement mixing pile.
5) After the strength of the first cement mixing pile reaches 80%, excavating foundation soil in the area surrounded by the Larsen steel sheet pile 2 in a subsection and layer-by-layer mode according to design requirements, and meanwhile erecting foundation pit horizontal supports 6 layer by layer from top to bottom. After the last layer of foundation pit horizontal support 6 is erected, continuously excavating the foundation pit to the top surface of the second cement mixing pile, wherein the designed bottom elevation of the foundation pit is a; finally, the utility model is a deep foundation pit supporting system of the larsen steel sheet pile-cement mixing pile in the soft soil field.
6) After the step 5), cement mortar can be poured and filled into the gaps between the adjacent outer Larsen steel sheet piles and the gaps between the adjacent inner Larsen steel sheet piles by a pressure grouting method, so that the lateral rigidity and the integrity of the support system can be enhanced; and (3) pouring cement mortar into the soil body at the lower section of the outer side of the outer layer Larsen steel sheet pile by adopting a pressure grouting method, so that the strength of the soil body in the area is enhanced, and the outer layer Larsen steel sheet pile is prevented from warping in the area.
The utility model discloses in the Larsen steel sheet pile be daily used Larsen steel sheet pile, the cement stirring stake is daily used cement stirring stake, the foundation ditch horizontal brace is daily used foundation ditch horizontal brace.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are within the scope of the present invention provided they are within the scope of the claims and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (9)
1. The deep foundation pit supporting system for the Larsen steel sheet piles and the cement mixing piles in the soft soil field is characterized by comprising an outer Larsen steel sheet pile enclosure, a first cement mixing pile enclosure among the steel sheet piles, an inner Larsen steel sheet pile enclosure, a foundation pit horizontal support, a second cement mixing pile enclosure serving as a waterproof curtain and a third cement mixing pile grid body in the curtain; the first cement mixing pile enclosure among the steel plate piles is arranged between the outer layer Larsen steel plate pile enclosure and the inner layer Larsen steel plate pile enclosure, the outer layer Larsen steel plate pile enclosure is an annular enclosure defined by a plurality of outer layer Larsen steel plate piles which are arranged at equal intervals, and the inner layer Larsen steel plate pile enclosure is an annular enclosure defined by a plurality of inner layer Larsen steel plate piles which are arranged at equal intervals; the outer Larsen steel sheet pile enclosure is arranged on the outer side of a first cement mixing pile enclosure among the steel sheet piles and clings to the outer side face of the first cement mixing pile enclosure among the steel sheet piles, the inner Larsen steel sheet pile enclosure and a second cement mixing pile enclosure used as a waterproof curtain are both arranged on the inner side of the first cement mixing pile enclosure among the steel sheet piles, and the inner Larsen steel sheet pile enclosure and the second cement mixing pile enclosure used as the waterproof curtain cling to the inner side face of the first cement mixing pile enclosure among the steel sheet piles from top to bottom in sequence; the lower part of the inner Larsen steel sheet pile enclosure is inserted into a second cement mixing pile enclosure used as a waterproof curtain; a second cement mixing pile enclosure used as a waterproof curtain and a third cement mixing pile grid body in the curtain are arranged below the ground; the lower part of the outer Larsen steel sheet pile enclosure is inserted into the ground, the depth of the outer Larsen steel sheet pile enclosure inserted into the ground is larger than the depth of the top surface of a second cement mixing pile enclosure used as a waterproof curtain and the depth of the top surface of a third cement mixing pile grid body in the curtain, namely the bottom surface of the outer Larsen steel sheet pile is lower than the top surface of the second cement mixing pile enclosure used as the waterproof curtain and the top surface of the third cement mixing pile grid body in the curtain; the second cement mixing pile enclosure used as a waterproof curtain is formed by 1-5 circles of second cement mixing piles which are mutually overlapped without gaps, and the first cement mixing pile enclosure among the steel plate piles is formed by a circle of first cement mixing piles which are mutually overlapped without gaps; the second cement mixing pile at the outermost ring of the second cement mixing pile enclosure used as the waterproof curtain is in gapless lap joint with the first cement mixing pile adjacent to the second cement mixing pile enclosure; a third cement mixing pile grid body in the curtain is arranged in an surrounded area of the second cement mixing pile at the innermost ring of the second cement mixing pile surrounding baffle; the third cement mixing pile grid body in the curtain comprises transverse grid strips and longitudinal grid strips, the transverse grid strips are transversely arranged, the longitudinal grid strips are longitudinally arranged, the transverse grid strips and the longitudinal grid strips are vertically arranged to form hollow grids, and the transverse grid strips and the longitudinal grid strips are formed by a plurality of third cement mixing piles which are mutually in gapless lap joint; the second cement mixing pile at the innermost ring of the second cement mixing pile enclosure and the third cement mixing pile adjacent to the second cement mixing pile are in gapless lap joint; the end part of the horizontal support of the foundation pit is propped against the inner side surface of the inner Larsen steel sheet pile enclosure.
2. The deep foundation pit supporting system of the Larsen steel sheet pile and the cement mixing pile for the soft soil field according to claim 1, wherein the pile diameter of the second cement mixing pile is 300-1000 mm; the adjacent second cement mixing piles in the same circle are in gapless lap joint, and the radial lap joint length between the adjacent second cement mixing piles in the same circle is 150-300 mm; the adjacent second cement mixing piles positioned in different circles are also in gapless lap joint, and the radial lap joint length between the adjacent second cement mixing piles positioned in different circles is 150-300 mm; when the second cement mixing pile at the outermost ring is in gapless lap joint with the first cement mixing pile adjacent to the second cement mixing pile, the radial lap joint length is 150-300 mm; when the second cement mixing pile at the innermost circle and the third cement mixing pile adjacent to the second cement mixing pile are in gapless lap joint, the radial lap joint length is 150-300 mm.
3. The deep foundation pit supporting system for the Larsen steel sheet pile and the cement mixing pile used for the soft soil field according to claim 1 or 2, wherein the lower part of the first cement mixing pile enclosure between the steel sheet piles and the lower part of the second cement mixing pile enclosure used as a waterproof curtain are inserted into the weak permeable soil layer; and a gap is formed between the bottom surface of the third cement mixing pile grid body in the curtain and the top surface of the weak permeable soil layer.
4. The deep foundation pit supporting system for the Larsen steel sheet pile and the cement mixing pile used in the soft soil field according to claim 3, wherein the height of the gap between the bottom surface of the grid body of the third cement mixing pile in the curtain and the top surface of the weak permeable soil layer is 1/2-1/3 of the height of the grid body of the third cement mixing pile in the curtain.
5. The deep foundation pit supporting system of the Larsen steel sheet pile and the cement mixing pile for the soft soil field according to claim 1 or 2, wherein the pile diameter of the third cement mixing pile is 300-800 mm, and the radial overlap length when the adjacent third cement mixing piles are overlapped without a gap is 150-300 mm.
6. The deep foundation pit supporting system for the Larsen steel sheet pile and the cement mixing pile used in the soft soil field according to claim 1 or 2, wherein the cross section of the outer Larsen steel sheet pile enclosure is wavy, the cross section of the inner Larsen steel sheet pile enclosure is also wavy, the outer Larsen steel sheet pile forming the outer Larsen steel sheet pile enclosure and the inner Larsen steel sheet pile forming the inner Larsen steel sheet pile enclosure are oppositely arranged, that is, the wave crest of the outer Larsen steel sheet pile enclosure with wavy cross section corresponds to the wave crest of the inner Larsen steel sheet pile enclosure with wavy cross section, and the wave trough of the outer Larsen steel sheet pile enclosure with wavy cross section corresponds to the wave trough of the inner Larsen steel sheet pile enclosure with wavy cross section;
the distance between the wave trough of the outer Larsen steel sheet pile enclosure with the wavy section and the wave trough of the inner Larsen steel sheet pile enclosure with the wavy section is 300-1000 mm.
7. The deep foundation pit supporting system of Larsen steel sheet piles and cement mixing piles for soft soil sites according to claim 1 or 2, wherein the pile diameter of the first cement mixing pile forming the first cement mixing pile enclosure between the steel sheet piles is 300-1000 mm, and the radial overlap length when the adjacent first cement mixing piles are overlapped without gaps is 150-300 mm.
8. The deep foundation pit supporting system for Larsen steel sheet piles and cement mixing piles for soft soil ground according to claim 1 or 2, wherein the depth of the lower portion of the Larsen steel sheet pile enclosure constituting the inner layer inserted into the second cement mixing pile enclosure serving as the waterproof curtain is 500-1500 mm.
9. The deep foundation pit supporting system for the Larsen steel sheet piles and the cement mixing piles for the soft soil ground according to claim 1 or 2, wherein the horizontal supports of the foundation pit comprise horizontal supports, longitudinal horizontal supports and oblique horizontal supports, the horizontal supports and the longitudinal horizontal supports are vertically arranged, two ends of each horizontal support respectively abut against different Larsen steel sheet piles on the inner layer, two ends of each longitudinal horizontal support also respectively abut against different Larsen steel sheet piles on the inner layer, and two ends of each oblique horizontal support respectively abut against the longitudinal horizontal supports and the horizontal supports.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921189043.3U CN210712864U (en) | 2019-07-26 | 2019-07-26 | Deep foundation pit supporting system of Larsen steel sheet pile and cement mixing pile for soft soil field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921189043.3U CN210712864U (en) | 2019-07-26 | 2019-07-26 | Deep foundation pit supporting system of Larsen steel sheet pile and cement mixing pile for soft soil field |
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| CN210712864U true CN210712864U (en) | 2020-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374112A (en) * | 2019-07-26 | 2019-10-25 | 中国能源建设集团湖南省电力设计院有限公司 | Weak soil site system of deep foundation pit support and its construction method |
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2019
- 2019-07-26 CN CN201921189043.3U patent/CN210712864U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110374112A (en) * | 2019-07-26 | 2019-10-25 | 中国能源建设集团湖南省电力设计院有限公司 | Weak soil site system of deep foundation pit support and its construction method |
| CN110374112B (en) * | 2019-07-26 | 2024-03-26 | 中国能源建设集团湖南省电力设计院有限公司 | Deep foundation pit supporting system for weak soil field and construction method thereof |
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