CN115288154A - Efficient building method of annular ultra-deep permanent foundation pit supporting structure - Google Patents
Efficient building method of annular ultra-deep permanent foundation pit supporting structure Download PDFInfo
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Abstract
The invention provides an efficient construction method of a circular ultra-deep permanent foundation pit supporting structure, and provides an engineering technical problem that a pile-column integrated inner ring supporting structure is added to support a lining wall and a continuous wall, so that the problems that a construction joint between the lining wall and the lining wall has large tensile stress, and a construction joint between the lining wall and the continuous wall has complex stress and cracks and water leakage often occur are solved, the integral supporting capability and durability of the permanent supporting structure are improved, and the service requirement of 50-100 years is met; on the other hand, the technical route and the technical bottleneck of the original design and construction method are broken through, an efficient construction method of 'multi-layer one-time excavation and reverse and forward combination' is provided for constructing the annular ultra-deep permanent foundation pit and the lining wall, namely, at least two layers of earthwork are excavated downwards continuously, the height of each layer of earthwork is at least 2.5 meters, then the lining wall is constructed upwards efficiently and sequentially layer by at least two layers, and the operation is repeated until the bottom of the foundation pit is constructed, so that the working efficiency is greatly improved.
Description
Technical Field
The invention belongs to the technical field of foundation pit design and construction, and particularly relates to an efficient construction method of a ring-shaped ultra-deep permanent foundation pit supporting structure.
Background
The foundation pit supporting engineering is a supporting, blocking, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit. Wherein adopt continuous wall supporting construction + interior brickwork structure usually to the super dark foundation ditch, promptly "wall" supporting construction, traditional ring shape super dark foundation ditch supporting construction design and construction exist following several not enough:
1. the pure theoretical calculation analysis method of the continuous wall supporting structure of the annular ultra-deep foundation pit converts the horizontal thrust of soil into the annular pressure of the continuous wall and the lining wall of the annular ultra-deep permanent foundation pit, so that an inner support is not arranged in the annular ultra-deep foundation pit. However, the annular ultra-deep permanent foundation pit bears water and soil pressure in the horizontal direction, and when various adverse conditions such as uneven distribution of peripheral soil layers, uneven earthwork excavation, uneven stacking and loading of the periphery, inconsistent or asymmetric soil layer excavation depth, other underground spaces at the periphery and the like are met, the continuous wall supporting structure of the annular ultra-deep permanent foundation pit is uneven in stress and even drifts of the annular ultra-deep permanent foundation pit, so that the supporting structure of the annular ultra-deep permanent foundation pit bears not only circumferential pressure but also bending, pressing, shearing and other composite stresses. If no specific measures are taken, a new design, construction and construction method is provided, and only the bearing annular pressure is considered according to the traditional pure theory calculation analysis method, so that the safety risk is easily generated.
2. Because the thickness of the lining wall of the annular ultra-deep foundation pit continuous wall is thicker, generally 1m to 3.0 m, the traditional design and construction method is to reversely design and construct the lining wall with the height of 3m downwards in a layered mode every time, the lining wall with the thickness is hung on the side face of the continuous wall in the traditional technology, and large bending shear stress is borne between the lining wall and a construction joint of a continuous wall supporting structure. Meanwhile, because the lining wall of the upper layer is hung from the lower part of the lining wall of the upper layer by 3 meters, the construction joint between the upper part and the lower part of the lining wall also bears larger tensile stress, the downward load of each square meter of the lining wall of each layer is 75kPa (3 meters high), and the downward load of each square meter of the lining walls of 10 layers to 15 layers is 750kPa to 1125kPa. The connection between each layer of lining wall and the continuous wall and the connection between the upper lining wall and the lower lining wall can generate great complex stress at construction joints during construction to cause cracking and a great amount of water leakage, which is very unfavorable for the safety and the use function of an ultra-deep permanent underground structure, seriously influences the safety, the durability and the use function of the underground structure, and is one of the main reasons for the existence of a great amount of water leakage of the similar underground structure at present.
3. Because the traditional deep foundation pit supporting structure is a temporary supporting structure, the service life of the ultra-deep foundation pit supporting structure such as a bridge annular anchor is 1.5 to 2 years, after the pouring of anchor concrete in the annular anchor ultra-deep foundation pit is completed, the function and the effect of the annular anchor ultra-deep foundation pit supporting are completed, the connection between the lining wall and the continuous wall in each layer and the connection between the upper lining wall and the lower lining wall can generate great complex stress at the construction joint, so that a large amount of water leakage occurs, although the service life requirement of the bridge annular anchor deep foundation pit supporting for 1.5 to 2 years is not influenced, the service life of the permanent ultra-deep foundation pit (note: the service depth of the foundation pit = the excavation depth-the bottom plate thickness, namely the service depth of the foundation pit is different from the excavation depth of the foundation pit by the bottom plate thickness, which is called as the permanent foundation pit, the excavation depth of the foundation pit is 45m, the bottom plate thickness is 4m, the service depth is 41m, namely the service depth of the permanent ultra-deep foundation pit supporting structure) can not meet the service life requirement of 50 to 100 years, namely the water leakage requirement. Meanwhile, the temporary deep foundation pit supporting structure is abandoned and permanently arranged underground after the construction of the underground main body structure is finished, certain temporary supporting structures need to be removed, large resource waste is caused, and the problems of large construction risk, long construction period, environmental pollution and the like exist.
And because the ultra-deep foundation pit such as the annular anchor ingot and the like is a temporary supporting structure with the service life of 1.5-2 years, the service life of the permanent ultra-deep foundation pit supporting structure is 50-100 years, and the construction difficulty and the requirement are much higher than those of the temporary annular ultra-deep foundation pit supporting structure. Therefore, the design and construction method of the temporary annular ultra-deep foundation pit supporting structure is not suitable for the construction of the annular ultra-deep permanent foundation pit supporting structure.
4. The traditional design and construction method of the annular ultra-deep foundation pit supporting structure comprises the steps of constructing a continuous wall with a certain thickness, excavating earthwork layer by layer downwards by taking 3m as a layer, constructing a lining wall by adopting a layer-by-layer reverse construction method by taking 3m as a layer, namely excavating earthwork downwards in layers (rings), wherein the height of each layer (ring) is 3 meters, and sequentially suspending the constructed lining wall downwards layer by layer (rings) and circularly downwards reversely constructing the lining wall layer by layer until the construction is carried out to the bottom of an underground structure according to the flow of excavating earthwork, laying lining wall steel bars, supporting a lining wall template and pouring lining wall concrete. According to different areas and depths of foundation pits, a circular ultra-deep foundation pit with the underground depth of 45m and the construction time of each layer (ring) of foundation pit is generally 20-30 days, the construction of 15 layers (rings) of foundation pits is required, 300-450 days are required, the concrete curing time (such as 10 days/layer) must be considered, the next layer of earthwork can be continuously excavated downwards when the concrete strength reaches 80% of the designed strength, the total construction time reaches 450-600 days, and the efficiency is very low. For a long time, the design and construction bottleneck of the annular ultra-deep foundation pit always breaks through by using a 3m layer (ring) to perform reverse construction downwards layer by layer (ring), so that the annular ultra-deep foundation pit always needs two construction periods of main flood season of Yangtze river, and the safety of the Yangtze river levee is influenced.
Therefore, it is necessary to develop a method for efficiently constructing a ring-shaped ultra-deep permanent foundation pit supporting structure to solve the above problems in the prior art.
Disclosure of Invention
The invention mainly aims to solve 4 major engineering technical problems existing in the background technology, and provides a method for efficiently constructing a circular ultra-deep permanent foundation pit, which solves the engineering technical problems that a construction joint between a lining wall and a lining wall has large tensile stress and a construction joint between the lining wall and a continuous wall has complex stress and cracks and water leakage often occur by adding a pile-column integrated inner ring inner support structure, improves the integral supporting capability and durability of a permanent supporting structure, and meets the service requirement of 50-100 years; on the other hand, the method breaks through the technical route and technical bottleneck of traditional design and construction, provides an efficient construction method of 'multi-layer one-time excavation and reversible combination' for constructing the annular ultra-deep permanent foundation pit and the lining wall, and greatly improves the working efficiency.
The invention is realized in the following way:
the invention provides a high-efficiency construction method of a ring-shaped ultra-deep permanent foundation pit supporting structure, which comprises the following steps:
s1: constructing a continuous wall of the annular ultra-deep permanent foundation pit; the continuous wall is formed by pouring reinforced concrete along the edge of the foundation pit and is used for supporting the foundation pit;
s2: constructing pile-column integrated inner ring support piles, and arranging a plurality of pile-column integrated inner ring support piles along the continuous wall in the plane of the annular ultra-deep permanent foundation pit;
s3: excavating earthwork in an annular ultra-deep permanent foundation pit, constructing a lining wall and a ring-shaped beam, and adopting a construction method of 'multi-layer one-time excavation and forward-backward combination' for the annular ultra-deep permanent foundation pit and the lining wall, namely excavating at least two layers of earthwork continuously downwards in the annular ultra-deep permanent foundation pit, wherein the height of each layer of earthwork is at least 2.5m, then constructing the lining wall in a mode of upwards forward-backward doing at least two layers layer by layer from bottom to top, and meanwhile horizontally arranging the ring-shaped beam at the lower part of each layer of lining wall, and connecting the ring-shaped beam with an integral pile-column inner ring support pile to enable the integral pile-column inner ring support pile and the ring-shaped beam to form an integral pile-column inner ring support structure to support the lining wall and the continuous wall;
s4: and repeating the step S3 after the strength of the interior lining wall meets the design requirement until the whole interior lining wall is built from top to bottom, and then constructing the bottom plate.
Through the steps, the annular ultra-deep permanent foundation pit supporting structure of the 'continuous wall + pile integrated inner ring supporting structure + lining wall' is efficiently built.
Furthermore, the distance between two adjacent pile-column integrated inner ring support piles in the same foundation pit is 3.5-10 m.
Furthermore, the distance between the central line of the pile-column integrated inner ring support pile and the central line of the continuous wall is 1.8-8 m.
Furthermore, the pile-integrated inner ring support piles can also be vertically arranged outside the lining wall, a radial connecting beam corresponding to the pile-integrated inner ring support piles is arranged at the lower part of each layer of the lining wall, one end of the radial connecting beam is connected with the continuous wall, the other end of the radial connecting beam is connected with the pile-integrated inner ring support piles, the continuous wall, the lining wall, the radial connecting beams and the annular beams are connected into a whole together, and the pile-integrated inner ring support piles support the lining wall and the continuous wall outside the lining wall.
Furthermore, the pile-integrated inner ring support piles can be arranged outside the lining wall in an inclined manner, a radial connecting beam corresponding to the pile-integrated inner ring support piles is arranged on the lower portion of each layer of lining wall, one end of each radial connecting beam is connected with the continuous wall, the other end of each radial connecting beam is connected with the pile-integrated inner ring support pile, and the pile-integrated inner ring support piles, the continuous wall, the lining wall, the radial connecting beams and the annular beam are connected into a whole together, so that the pile-integrated inner ring support piles can bear a certain transverse water and soil pressure while obliquely supporting the lining wall and the continuous wall, and the water and soil pressure resistance of the continuous wall is further improved.
Further, the pile-column integrated inner ring support pile can be a drilled pile, a precast pile or a steel structure pile, a reinforced concrete pile, a steel or concrete combined pile.
The invention has the beneficial effects that:
1. the construction method of the annular ultra-deep (permanent) foundation pit supporting structure comprehensively considering the compound stress of annular pressure, bending, pressing, shearing and the like is provided, so that a wall supporting pile supporting structure system of an inner ring supporting pile and an inner lining wall integrated with an annular continuous wall and piles and columns and a design and construction method thereof are formed, the integral supporting capacity and deformation resistance of the annular ultra-deep permanent foundation pit supporting structure are improved, the adverse conditions of uneven peripheral soil layer distribution, uneven earthwork excavation, uneven peripheral pile loading, uneven and asymmetric depth of soil layer excavation, close connection with underground space and the like can be effectively dealt with, and the safety risk of the annular ultra-deep permanent foundation pit is effectively controlled.
2. The construction technical problem that water leakage is caused due to the fact that large bending shear stress exists in construction joints between lining walls and continuous walls and large tensile stress exists in construction joints between the lining walls, and therefore cracking is easy to occur is solved, and the foundation pit supporting structure can meet the functional requirement and the structural durability requirement that the service life of an ultra-deep permanent foundation pit is 50-100 years and water leakage does not occur. And this foundation pit supporting construction can also directly regard as partly of secret major structure, has effectively avoided wasting of resources and environmental pollution, has shortened construction cycle, has reduced the construction risk, has reduced engineering cost.
3. Because a 'multi-layer one-time excavation and a backward and forward combined' new design and construction process of the annular ultra-deep permanent foundation pit are formed, for example, earthwork with the depth of 7.5m can be excavated once (namely, earthwork with the height of 2.5m is used as a small layer, three small layers of earthwork are excavated continuously downwards, and a large layer of earthwork with the total height of 7.5m is excavated), then three layers of lining walls (namely, lining walls with the height of 2.5m are constructed on each layer) or two layers of lining walls (namely, lining walls with the height of 3.75m are constructed on each layer) are constructed continuously upwards and sequentially, the design and construction bottleneck that the traditional annular ultra-deep foundation pit lining wall always adopts 3m layers (rings) to perform backward construction layer by layer (rings) downwards is broken through, the work efficiency is greatly improved, and the construction of the annular ultra-deep permanent foundation pit can be completed in the main flood season period of the Yangtze river.
Drawings
Fig. 1 is a top view of a pile-column integrated inner ring support pile of an annular ultra-deep permanent foundation pit supporting structure provided by an embodiment of the invention vertically arranged in an inner lining wall;
fig. 2 is a cross sectional view of a pile-column integrated inner ring support pile of the annular ultra-deep permanent foundation pit supporting structure provided by the embodiment of the invention vertically arranged in an inner lining wall;
fig. 3 is a top view of a pile-column integrated inner ring support pile of the annular ultra-deep permanent foundation pit supporting structure provided by the embodiment of the invention vertically arranged outside an inner lining wall;
fig. 4 is a cross sectional view of a pile-column integrated inner ring support pile of the annular ultra-deep permanent foundation pit supporting structure provided by the embodiment of the invention vertically arranged outside an inner lining wall;
fig. 5 is a cross sectional view of a pile-column integrated inner ring support pile of the annular ultra-deep permanent foundation pit supporting structure provided by the embodiment of the invention obliquely arranged outside an inner lining wall;
FIG. 6 is a cross-sectional view of the stress condition of construction joints between a lining wall and a continuous wall and between the upper part and the lower part of the lining wall of the conventional annular ultra-deep permanent foundation pit supporting structure; wherein P is the tensile stress of the lower lining wall acting on the upper lining wall, M is the bending stress of the lining wall acting on the continuous wall, and F is the shear stress of the lining wall on the continuous wall.
In the figure: 1-continuous wall, 2-lining wall, 3-pile-column integrated inner ring support pile, 4-ring beam, 5-radial connecting beam and 6-soil layer.
Detailed Description
Embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides a high-efficiency construction method of a ring-shaped ultra-deep permanent foundation pit supporting structure, which is characterized in that a pile-column integrated inner ring supporting structure is added to support a lining wall 2 and a continuous wall 1, wherein the pile-column integrated inner ring supporting structure comprises a plurality of ring beams 4 horizontally arranged in the lining wall 2 and pile-column integrated inner ring supporting piles 3 arranged on the inner side of a foundation pit and connected with the ring beams 4, then a construction method of multi-layer one-time excavation and reverse and forward combination is adopted to construct the ring-shaped ultra-deep permanent foundation pit and the lining wall 2 based on the pile-column integrated inner ring supporting structure, namely at least two layers of earthwork are continuously excavated downwards, the height of each layer of earthwork is at least 2.5 meters, and then the lining wall 2 is efficiently constructed upwards in sequence by at least two layers.
The method specifically comprises the following steps:
s1, constructing a continuous wall 1 of a circular ultra-deep permanent foundation pit; the continuous wall 1 is formed by pouring reinforced concrete along the edge of the annular ultra-deep permanent foundation pit and is used for supporting the annular ultra-deep permanent foundation pit.
In the step, the continuous wall 1 firstly adopts a grooving machine, a long and narrow deep groove is excavated along the peripheral axis of the foundation pit engineering under the condition of slurry wall protection, a reinforcement cage is hung in the groove after the groove is cleared, then underwater concrete is poured by a conduit method to form a unit groove section, and the steps are carried out section by section, so that a continuous reinforced concrete wall is built under the soil layer 6 to be used as a water-intercepting, seepage-proofing, bearing and soil-retaining structure of the annular ultra-deep permanent foundation pit.
S2: constructing the pile-column integrated inner ring supporting pile 3; and arranging a plurality of pile-column integrated inner ring supporting piles 3 along the continuous wall 1 in the plane of the annular ultra-deep permanent foundation pit.
In the step, according to the point positions measured on the foundation pit, a hole is formed at an interval of 3.5-10 m along the inner side of the continuous wall 1 of the annular foundation pit by using a hole forming device, then a reinforcement cage is hung, and concrete is poured to form the pile-column integrated inner ring support pile 3. When the foundation pit earthwork is excavated subsequently, the pile-integrated inner ring support piles 3 gradually expose out of the ground, and serve as support columns (therefore, referred to as pile-integrated inner ring support piles 3) to support the inner lining wall 2 and the continuous wall 1 together with the annular beams 4.
Of course, the pile-integrated inner ring support pile 3 may be not only the reinforced concrete pile, but also a precast pile, a steel structure pile, or a combined pile of steel and concrete.
S3: excavating earthwork in the annular ultra-deep permanent foundation pit, and constructing a lining wall 2 and an annular beam 4; the lining wall 2 and the ring beam 4 are both formed by pouring reinforced concrete, and the pile-column integrated inner ring support piles 3 and the ring beam 4 are added, so that most of the load of the lining wall 2 in the invention is borne by the pile-column integrated inner ring support piles 3, therefore, the invention adopts an efficient construction method of 'multilayer one-time excavation and inverse and direct combination' for the annular ultra-deep permanent foundation pit and the lining wall 2, namely, the annular ultra-deep permanent foundation pit is continuously excavated downwards to form three layers of earthwork, the height of each layer of earthwork is at least 2.5 meters, earthwork with the height of at least 7.5m is excavated in total, the ring beam 4 is horizontally arranged at the lower part of each layer of the lining wall 2, the ring beam 4 is connected with the pile-column integrated inner ring support piles 3, and the lining wall 2 and the lining wall inner ring support piles are constructed upwards in a three-layer-by-layer (namely, the lining wall 2.5m high lining wall is constructed at least) or two layers (namely, the lining wall is constructed at least 3.75m high) are constructed layer by layer according to form the lining wall 2 and the continuous pile-layer structure and the lining wall and the pile support piles and the inner ring wall 2 and the continuous pile wall are constructed by layer.
Of course, according to the soil condition, the peripheral load and the underground water condition, two layers of earthwork can be continuously excavated downwards, the height of each layer of earthwork is 3.75m, a large layer of earthwork with the height of 7.5m is excavated in total, and then the lining wall 2 is constructed in a way of sequentially working upwards layer by layer (namely constructing the lining wall with the height of 3.75m on each layer), so that the pile-column integrated inner ring support pile 3 and the annular beam 4 form a pile-column integrated inner ring support structure to support the lining wall 2 and the continuous wall 1.
Excavating a large layer of earthwork 7.5m high from top to bottom in the whole ultra-deep foundation pit, and constructing a 7.5m high inner lining wall on each large layer from layer to layer, which is called reverse construction; however, the lining wall 2 with 7.5m height of each large floor is constructed upwards in three layers or two layers, which is called as sequential construction; the whole is reverse construction, but the lining wall 2 constructed upwards in layers is smooth, so the new design and construction process is called 'multi-layer once excavation, reverse and smooth combination'.
The pile-column integrated inner ring supporting structure supports the lining wall 2 and the continuous wall 1, on one hand, the unfavorable stress state of the whole load of the lining wall 2 born by the connecting construction joint between the lining wall 2 and the continuous wall 1 in the traditional technology shown in figure 6 is efficiently changed, the bending and shearing stress of the construction joint between the lining wall 2 and the continuous wall 1 supporting structure is greatly reduced, and the unfavorable stress state of the tensile stress born by the construction joint between two layers of adjacent lining walls 2 is efficiently changed, thereby efficiently solving the major engineering technical problems of cracking and water leakage of the construction joint between two layers of adjacent lining walls 2, the construction joint between the lining wall 2 and the continuous wall 1, the integral supporting capacity, the deformation resistance and the safety performance of a supporting structure are improved, on the other hand, the technical route and the technical bottleneck of the traditional design and construction are broken through, a high-efficiency construction method of 'multilayer one-time excavation and reverse and forward combination' is provided for constructing the annular ultra-deep permanent foundation pit and the lining wall 2, so that the depth of the foundation pit which can be excavated downwards at one time is deeper (for example, three layers of earthwork, namely 7.5m high earthwork, can be excavated downwards at one time), the lining wall 2 can be constructed into three layers (namely, each layer is constructed with 2.5m high lining wall) or two layers (namely, each layer is constructed with 3.75m high lining wall 2) from bottom to top, the construction is continuously and efficiently performed, the whole is easier to be connected, water leakage is not easy to occur, the construction efficiency is higher, and the construction period is shorter;
s4: and repeating the step S3 after the strength of the interior lining wall 2 meets the design requirement until the whole interior lining wall 2 is built from top to bottom, and then constructing a bottom plate.
Through the steps, the annular ultra-deep permanent foundation pit supporting structure of the 'continuous wall + pile integrated inner ring supporting structure + inner lining wall' is efficiently built.
Furthermore, the central line of the pile-integrated inner ring support piles 3 is 1.8 m-8 m away from the central line of the continuous wall 1, so that the pile-integrated inner ring support structure can flexibly support the lining wall 2 and the continuous wall 1 according to different use and construction requirements, as shown in fig. 1 and 2, when the lining wall 2 is thick or when the pile-integrated inner ring support piles 3 are required to bear the water and soil pressure of a foundation pit, the pile-integrated inner ring support piles 3 are vertically arranged inside the lining wall 2, so that the overall support effect on the lining wall 2 and the continuous wall 1 is improved.
As shown in fig. 3 and 4, when the thickness of the lining wall 2 is thin or when the pile-integrated inner ring support piles 3 are required to bear large water and soil pressure of the foundation pit, the pile-integrated inner ring support piles 3 are vertically arranged outside the lining wall 2, a radial connecting beam 5 corresponding to the pile-integrated inner ring support piles 3 is arranged at the bottom of each layer of the lining wall 2, one end of the radial connecting beam 5 is connected with the continuous wall 1, and the other end of the radial connecting beam is connected with the pile-integrated inner ring support piles 3, so that the continuous wall 1, the lining wall 2, the pile-integrated inner ring support piles 3, the radial connecting beams 5 and the annular beams 4 are connected into a whole together, the lining wall 2 and the continuous wall 1 are supported outside the lining wall 2, and most of the load of the reinforced concrete lining wall 2 and part of horizontal force generated when the annular ultra-deep permanent foundation pit drifts can be effectively borne.
Similarly, as shown in fig. 5, as a preferred embodiment, the pile-integrated inner ring support piles 3 may also be arranged outside the inner lining wall 2 in an inclined manner, and a radial coupling beam 5 corresponding to the pile-integrated inner ring support pile 3 is arranged at the bottom of each layer of the inner lining wall 2, one end of the radial coupling beam 5 is connected to the continuous wall 1, and the other end is connected to the pile-integrated inner ring support pile 3, so that the continuous wall 1, the inner lining wall 2, the pile-integrated inner ring support piles 3, the radial coupling beam 5, and the ring beam 4 are connected together into a whole, and the inner lining wall 2 and the continuous wall 1 are supported in an inclined manner outside the inner lining wall 2, and can also bear a certain transverse pressure, thereby further improving the ability of the continuous wall 1 to resist water and soil pressure.
It should be noted that the pile-integrated inner ring support piles 3 of the present invention have the same appearance as the conventional double-row pile support piles of the ultra-deep foundation pit, but have fundamentally different arrangement and functions. The method is characterized in that the in-pit supporting piles of the traditional double-row pile support are in a continuous small-spacing dense distribution mode, the spacing is small, the spacing is generally 0.5-0.8 m, the out-pit supporting piles are also in a continuous small-spacing dense distribution mode, the spacing is small, the spacing is generally 0.5-2.0 m, the out-pit supporting piles are closely connected with a supported soil layer 6, and the in-pit supporting piles and the out-pit supporting piles share the horizontal force transmitted by the soil body and play roles in retaining soil and stopping water. If the supporting piles in the pit are arranged at large intervals, the situations of water leakage and soil flowing among the piles can occur; particularly, in the traditional double-row pile supporting mode, before earth excavation, the top of double-row piles is provided with crown beams and capping beams to connect the tops of the double-row piles (but other elevations cannot be connected), namely, after the front-row piles (in-pit piles) and the rear-row piles (out-pit piles) are connected into a whole on the pile tops, the earth excavation is carried out, and after the earth excavation, the front-row supporting piles and the rear-row supporting piles are simultaneously stressed together. The pile-integrated inner ring supporting pile 3 is different from the row piles in arrangement position, stress, connection mode and play different roles, and firstly, the pile-integrated inner ring supporting pile 3 is arranged inside a foundation pit but not outside the foundation pit; before the foundation pit is excavated, because the pile-column integrated inner ring supporting pile 3 is not directly connected with the continuous wall 1, when the continuous wall 1 is stressed after the foundation pit is excavated, and the pile-column integrated inner ring supporting pile 3 positioned in the foundation pit is not stressed; because the earthwork excavation is firstly carried out, then the lining wall 2 is constructed, and then the lining wall 2 and the continuous wall 1 are connected into a whole through the pile-column integrated inner ring supporting structure, when the earthwork is continuously excavated downwards after the concrete strength of the lining wall 2 reaches the design requirement, the pile-column integrated inner ring supporting pile 3 and the continuous wall 1 start to bear the force together. Thirdly, the pile-column integrated inner ring support pile 3 is connected with the continuous wall 1 at the position of each layer of lining wall; fourthly, the pile-column integrated inner ring supporting piles 3 are arranged at large intervals of 3.5-10 m, are not closely connected with a supported soil body, mainly play a role in supporting the vertical load of the lining wall 2 and simultaneously bear certain horizontal force.
According to the invention, the pile-column integrated inner ring supporting structure is additionally arranged inside the lining wall 2 or outside the lining wall 2, most of load of the lining wall 2 is borne by the pile-column integrated inner ring supporting piles 3, the pile-column integrated inner ring supporting structure, the continuous wall 1 and the lining wall 2 jointly form a novel wall supporting pile supporting structure of 'circular continuous wall + pile-column integrated inner ring supporting structure + lining wall', the engineering technical problem that a construction joint between the lining wall 2 and the continuous wall 1 has large bending and shearing stress and a construction joint between the upper part and the lower part of the lining wall 2 has large tensile stress due to the traditional technology, so that water leakage is easily generated due to cracking is solved, the durability of a permanent supporting structure is improved, the service requirement of 50-100 years is met, and the integral supporting capability and deformation resistance of a circular ultra-deep permanent foundation pit are improved. Meanwhile, by implementing novel design and construction process and method of 'multi-layer one-time excavation and reversible combination' on the annular ultra-deep permanent foundation pit, the problem that the lining wall 2 of the annular ultra-deep foundation pit can only be constructed in a reverse construction mode of 3m one layer (ring) downwards layer by layer (ring) in the traditional construction process is solved, the working efficiency is greatly improved, the construction period is shortened, and the purpose of efficiently and safely completing the supporting structure of the annular ultra-deep permanent foundation pit in the main flood season period of the Yangtze river by 40m of the ultra-deep permanent foundation pit is realized.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (6)
1. A high-efficiency construction method of a ring-shaped ultra-deep permanent foundation pit supporting structure is characterized by comprising the following steps: the method comprises the following steps:
s1: constructing a continuous wall of the annular ultra-deep permanent foundation pit; the continuous wall is formed by pouring reinforced concrete along the edge of the foundation pit and is used for supporting the annular ultra-deep permanent foundation pit;
s2: constructing pile-integrated inner ring supporting piles, and arranging a plurality of pile-integrated inner ring supporting piles along the continuous wall in the plane of the annular ultra-deep permanent foundation pit;
s3: excavating earthwork in a circular ultra-deep permanent foundation pit, constructing a lining wall and a ring-shaped beam, and adopting a construction method of 'multilayer one-time excavation and reverse and forward combination' for the circular ultra-deep permanent foundation pit and the lining wall, namely excavating at least two layers of earthwork continuously downwards in the circular ultra-deep permanent foundation pit, wherein the height of each layer of earthwork is at least 2.5m, then dividing the circular ultra-deep permanent foundation pit into at least two layers from bottom to top, constructing the lining wall in a mode of upward and forward construction layer by layer, horizontally arranging the ring-shaped beam at the lower part of the lining wall in each layer, and connecting the ring-shaped beam with the pile-integrated inner ring support pile to enable the pile-integrated inner ring support pile and the ring-shaped beam to form a pile-integrated inner ring support structure to support the lining wall and the continuous wall;
s4: repeating S3 after the strength of the lining wall meets the design requirement until the whole lining wall is built from top to bottom, and then constructing a bottom plate;
through the steps, the annular ultra-deep permanent foundation pit supporting structure of the 'continuous wall + pile integrated inner ring supporting structure + inner lining wall' is efficiently built.
2. The efficient construction method of the annular ultra-deep permanent foundation pit supporting structure of claim 1, characterized by comprising the following steps: the distance between the two pile-column integrated inner ring supporting piles is 3.5-10 m.
3. The efficient construction method of the annular ultra-deep permanent foundation pit supporting structure of claim 1, characterized by comprising the following steps: the distance between the central line of the pile-column integrated inner ring support pile and the central line of the continuous wall is 1.8-8 m.
4. The efficient construction method of the annular ultra-deep permanent foundation pit supporting structure of claim 1, characterized by comprising the following steps: the pile-column integrated inner ring support piles are vertically arranged outside the inner lining wall, the lower portion of each layer of the inner lining wall is provided with a radial connecting beam corresponding to the pile-column integrated inner ring support piles, one end of each radial connecting beam is connected with the continuous wall, and the other end of each radial connecting beam is connected with the pile-column integrated inner ring support pile, so that the pile-column integrated inner ring support piles, the continuous wall, the inner lining wall, the radial connecting beams and the annular beams are connected into a whole together, and the pile-column integrated inner ring support piles support the inner lining wall and the continuous wall outside the inner lining wall.
5. The efficient construction method of the annular ultra-deep permanent foundation pit supporting structure of claim 1, characterized in that: the pile-column integrated inner ring support piles are arranged outside the lining wall in an inclined mode, the lower portion of each layer of lining wall is provided with a radial connecting beam corresponding to the pile-column integrated inner ring support piles, one end of each radial connecting beam is connected with the continuous wall, the other end of each radial connecting beam is connected with the pile-column integrated inner ring support pile, and the pile-column integrated inner ring support piles, the continuous wall, the lining wall, the radial connecting beams and the annular beams are connected into a whole together, so that the pile-column integrated inner ring support piles can bear certain transverse water and soil pressure while obliquely supporting the lining wall and the continuous wall, and the water and soil pressure resistance of the continuous wall is further improved.
6. The efficient construction method of the annular ultra-deep permanent foundation pit supporting structure of claim 1, characterized by comprising the following steps: the pile-column integrated inner ring support pile is a reinforced concrete pile, a precast pile, a steel structure pile or a steel and concrete combined pile.
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