CN103244143B - A kind of underground construction excavating construction method and underground station - Google Patents
A kind of underground construction excavating construction method and underground station Download PDFInfo
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- CN103244143B CN103244143B CN201310201546.9A CN201310201546A CN103244143B CN 103244143 B CN103244143 B CN 103244143B CN 201310201546 A CN201310201546 A CN 201310201546A CN 103244143 B CN103244143 B CN 103244143B
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- 238000010276 construction Methods 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 151
- 239000010959 steel Substances 0.000 claims abstract description 151
- 239000002689 soil Substances 0.000 claims abstract description 47
- 238000009412 basement excavation Methods 0.000 claims abstract description 34
- 239000004567 concrete Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000009415 formwork Methods 0.000 claims description 13
- 239000011378 shotcrete Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 abstract 3
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 229910000679 solder Inorganic materials 0.000 abstract 1
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- 230000000149 penetrating effect Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 1
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- 239000011120 plywood Substances 0.000 description 1
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Abstract
The invention discloses a kind of underground construction excavating construction method and underground station.Along longitudinal some evenly distributed, the mutual occlusions of jacking in the top of underground engineering structure and the periphery of dual-side and the steel pipe of peripheral solder wing plate in the working pit that described underground construction excavating construction method is included in outside underground construction; Excavate the soil body in steel pipe and within the scope of adjacent steel pipe wing plate institute bag in jack-in process in time, and adopt connector by adjacent steel pipe lateral connection; Close the two ends of steel pipe two ends and adjacent steel pipe wing plate institute bag scope, placing of concrete within the scope of steel pipe and adjacent steel pipe wing plate institute bag, make the steel pipe of occlusion mutually form overall stressed board wall; Step excavation underground construction agent structure central sill, the post corresponding position soil body, and after soil excavation, perform beam, the rod structure of agent structure; And with performing each laminate wall construction of agent structure while soil excavation.This construction method can control surface settlement preferably, work progress degree of safety is high, mechanization degree is high.
Description
Technical Field
The invention relates to the technical field of design and construction of tunnels and underground engineering, in particular to an underground engineering underground excavation construction method and an underground station for underground engineering under the conditions of shallow buried depth and weak surrounding rocks.
Background
With the rapid and continuous development of socioeconomic performance in China, large-scale subway construction and underground space development are started in many large and medium-sized cities in China. For underground engineering construction, an open cut method is usually adopted, however, due to the restriction of dense buildings, heavy traffic, high land price, dense underground pipelines and underground structures in downtown businesses, enterprises, finance, residences and the like, part of engineering is difficult to adopt open cut construction, and therefore the proportion of underground excavation subway engineering in domestic subway construction tends to increase.
Due to different geological conditions, the structural form of underground excavation subway engineering and the adopted construction method have great difference, so the structural form and the underground excavation construction method in the underground space construction of China also have the characteristic of diversity. At present, the underground excavation methods which are more applied in China comprise a middle hole method, a PBA construction method, a hole pile method, a double-side-wall pit guiding method, a CRD method and the like, and the common characteristics of the methods are that the excavation process is short in advance support or insufficient in rigidity, a certain self-stabilizing capacity of a tunnel face is required, if the self-stabilizing capacity of the tunnel face is insufficient, a tunnel face stratum needs to be reinforced, the construction period is prolonged, the construction cost is increased, meanwhile, the construction quality is difficult to guarantee, and collapse accidents often occur. Therefore, the common underground excavation construction method is rarely adopted in the particularly weak areas of the southern country rock. Meanwhile, the construction process of the methods needs to excavate the soil body before supporting, so that even if various auxiliary measures are taken, the problems of large ground settlement, high safety risk, difficulty in meeting deformation of upper pipelines and important buildings and the like still exist, and the method can not be used for underground excavation construction even in areas with difficult precipitation. Meanwhile, the existing underground excavation method has narrow operation space, is not suitable for mechanical construction, and depends on great experience components of operators in the construction process, so that casualties and accidents frequently occur in the construction process.
From the above, it is necessary to provide a subsurface excavation construction method for underground works and an underground station, which can be applied to any weak stratum, especially, can well control settlement in the weak stratum with shallow buried depth, large span and high underground water level, and has the advantages of high safety and high mechanization degree in the construction process.
Disclosure of Invention
The invention aims to provide an underground engineering underground excavation construction method and an underground station, which can be applied to any weak stratum, can well control sedimentation particularly in the weak stratum with shallow buried depth, large span and high underground water level, and has high safety and high mechanization degree in the construction process.
According to one aspect of the invention, the underground engineering subsurface excavation construction method for the conditions of shallow buried depth and weak surrounding rocks comprises the following steps:
longitudinally jacking a plurality of steel pipes which are uniformly arranged, mutually occluded and welded with wing plates at the periphery in a working pit at the outer side of the underground engineering along the top of the underground engineering structure and the peripheries of two side edges;
in the jacking process, soil bodies in the steel pipes and in the range covered by the wing plates of the adjacent steel pipes are timely excavated, and the adjacent steel pipes are transversely connected by adopting a connecting piece;
closing the two ends of the steel pipe and the two ends of the range covered by the adjacent steel pipe wing plates, and pouring concrete into the range covered by the steel pipe and the adjacent steel pipe wing plates, so that the mutually occluded steel pipes form an integrally stressed plate wall, namely an advanced formwork primary support;
excavating soil bodies at corresponding parts of beams and columns in a main structure in the underground engineering step by step, and constructing the beam and column structures of the main structure in time after the soil bodies are excavated; and constructing each layer plate and wall structure of the main body structure while excavating along with the soil body.
The method comprises the following steps of excavating soil bodies at corresponding parts of beams and columns in a main structure in the underground engineering step by step, and constructing the beam and column structures of the main structure in time after the soil bodies are excavated; and constructing each plywood of the main structure and the wall structure along with the excavation of the soil body, and the method specifically comprises the following steps:
a first lower pilot tunnel is longitudinally excavated at the position of one bottom beam of the main structure, and a bottom beam lower waterproof plate and a bottom longitudinal beam are constructed in the first lower pilot tunnel;
longitudinally excavating a first small foundation pit at the top longitudinal beam part which is above the first lower pilot tunnel and corresponds to the bottom beam, and constructing a top longitudinal beam top waterproof plate and a top longitudinal beam in the first small foundation pit; and
excavating a first hole at a center pillar above the first lower pilot tunnel between the first lower pilot tunnel and the first small foundation pit; constructing a first upright post for connecting the bottom longitudinal beam and the top longitudinal beam in the first hole;
constructing other one or more groups of bottom longitudinal beam, upright post and top longitudinal beam structures in the main body structure in the same sequence;
after the construction of a plurality of groups of bottom longitudinal beams, upright columns and top longitudinal beams in the main body structure is finished, excavating soil above the middle plate of the station hall layer in a longitudinal subsection mode, and constructing a reinforced concrete structure of the middle longitudinal beams and the middle plate;
after the middle longitudinal beam and the middle plate reach 80% of the design strength, excavating a mid-span soil body to the bottom of the underground engineering, constructing a mid-span bottom plate waterproof layer and pouring mid-span bottom plate concrete;
and after the mid-span bottom plate concrete reaches 80% of the design strength, excavating the side-span soil body to the bottom of the underground engineering in a longitudinal segmentation mode, wherein the length of each segment is not larger than the side-span, and constructing a side-span bottom plate waterproof layer and pouring the side-span bottom plate concrete. And after the bottom plate reaches 80% of the design strength, longitudinally excavating a next section of side span soil body to the bottom of the underground engineering, constructing a side span bottom plate waterproof layer and pouring side span bottom plate concrete.
Preferably, the main structure of the underground engineering comprises two groups of bottom longitudinal beams, vertical columns and top longitudinal beam structures, and the other groups of bottom longitudinal beams, vertical columns and top longitudinal beams are respectively constructed after a second lower pilot tunnel, a second hole and a second small foundation pit are excavated; wherein,
an upright column between the bottom longitudinal beam in the second lower pilot tunnel and the top longitudinal beam in the second small foundation pit is a second upright column;
and after the top longitudinal beam is constructed and completed in the first small foundation pit and the second small foundation pit respectively, excavating the soil body between the first small foundation pit and the second small foundation pit to enable the first small foundation pit and the second small foundation pit to be communicated, and constructing a mid-span top plate.
Wherein the first lower pilot tunnel and the second lower pilot tunnel are supported by a grid and shotcrete, an
And the side walls and the bottom plates of the first small foundation pit and the second small foundation pit are supported by adopting grids and sprayed concrete.
Wherein, all be equipped with the preformed hole on every steel pipe, utilize the connecting piece with adjacent steel pipe transverse connection specifically be:
penetrating the connecting piece out of the prepared hole of the steel pipe in the steel pipe, penetrating the connecting piece into the prepared hole of the adjacent steel pipe, and installing reinforcing bolts at two ends of the connecting piece, wherein,
the connecting piece is a short steel bar or an anchor bolt.
Furthermore, in the process of excavating the mid-span soil body to the bottom of the underground engineering, after excavating a part of the mid-span soil body, a temporary bracket support for supporting the middle plate is erected below the middle plate,
the temporary bracket supports and is fixed on the steel pipe of the advanced formwork primary support.
Preferably, the two ends of the steel pipe and the two ends of the range covered by the adjacent steel pipe wing plates are sealed by using plugging plates; and
concrete pouring to the steel pipe and the range covered by the adjacent steel pipe wing plates specifically comprises the following steps:
and inserting a concrete pouring pipe into one end of the range covered by the steel pipe and the adjacent steel pipe wing plate, inserting an exhaust pipe into the other end of the range covered by the steel pipe and the adjacent steel pipe wing plate, and pouring concrete into the range covered by the steel pipe and the adjacent steel pipe wing plate through the pouring pipe.
According to another aspect of the present invention, there is also provided an underground station, including a top plate, a bottom plate, and two side walls of a station hall layer, the top plate, the two side walls of the station hall layer, and the bottom plate enclosing a main support of the underground station, the underground station further including a steel pipe support frame, a middle plate, a first steel pipe column, and a second steel pipe column, wherein,
the top plate is provided with a first top longitudinal beam and a second top longitudinal beam, the bottom plate is provided with a first bottom longitudinal beam and a second bottom longitudinal beam, and the first steel pipe upright is arranged between the first top longitudinal beam and the first bottom longitudinal beam; the second steel pipe upright is arranged between the second top longitudinal beam and the second bottom longitudinal beam;
middle longitudinal beams are respectively arranged on the two side walls of the station hall layer, and the middle plate is arranged between the middle longitudinal beams of the two side walls;
the steel pipe support frame is arranged on the periphery of the main support.
Furthermore, a waterproof layer is arranged between the steel pipe support frame and the main support.
The steel pipe support frame is composed of a plurality of steel pipes which are equal in interval, mutually meshed and welded with wing plates on the periphery, the range covered by the adjacent steel pipe wing plates forms a closed space, and concrete is poured into the range covered by the steel pipes and the adjacent steel pipe wing plates.
As can be seen from the above, the construction method of the present invention first performs the preliminary support of the advanced formwork before the soil body is excavated. Because the advanced formwork primary support supports the whole underground excavation construction working face, the strength of the soil body is not required, the influence of the excavation process on the ground is small, and even if the underground excavation construction working face is in a weak stratum under severe conditions of shallow buried depth, large span, high underground water level and the like, the underground excavation construction method can still smoothly construct the underground excavation construction working face and well control the ground settlement. Therefore, the invention has the advantages of small ground settlement, high safety degree in the construction process and high degree of mechanization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other embodiments and drawings may be devised by those skilled in the art based on the exemplary embodiments shown in the drawings.
FIG. 1 is a flow chart showing the steps of the underground excavation construction method of the underground engineering;
FIG. 2 shows a cross-sectional view of the intermeshed steel tubes of the present invention;
FIG. 3 is a schematic structural diagram of the bottom longitudinal beam, the first upright post and the top longitudinal beam after construction is completed;
FIG. 4 is a schematic view of the construction of a mid-span roof panel after completion;
FIG. 5 is a schematic illustration of the mid-span floor construction;
FIG. 6 shows a schematic structural diagram of the side span floor after concrete pouring is completed;
fig. 7 shows a schematic structural view of an underground station;
fig. 8 is a cross-sectional view showing the steel pipes engaged with each other in the steel pipe support frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Fig. 1 is a flow chart showing steps of the underground excavation construction method of the underground engineering, as shown in fig. 1, comprising the following steps:
s101: and a plurality of steel pipes which are uniformly arranged, mutually occluded and welded with wing plates on the peripheries are longitudinally jacked in a working pit outside the underground engineering along the top and the peripheries of two side edges of the underground engineering structure, and the wing plates between the adjacent steel pipes seal the space between the adjacent steel pipes.
Figure 2 shows a cross-sectional view of the intermeshing steel pipes of the present invention. As shown in FIG. 2, two wing plates 11 are welded on the left and right sides of the steel pipe 1, respectively, the two wing plates 11 are symmetrical about the transverse axis of the steel pipe, the distance between the two wing plates is smaller than the diameter of the steel pipe, and the wing plates 11 on the left and right sides are symmetrical about the longitudinal axis of the steel pipe.
Meanwhile, a channel steel 12 is welded between the two wing plates 11 on one side of the steel pipe 1, and a T-shaped engaging piece 13 is welded between the two wing plates 11 on the other side. A gap is formed in the middle of the bottom of the channel steel 12, and the width of the upper end of the T-shaped occluding piece 13 is larger than that of the gap of the channel steel 12.
After one steel pipe 1 is pushed in, the T-shaped occluding piece 13 of the other steel pipe penetrates into the channel steel 12 through the notch of the channel steel 12 which is pushed in, and then is pushed in, so that the occlusion between the adjacent steel pipes is realized. . The flanges 11 between the adjacent steel pipes are overlapped with each other so that the space between the adjacent steel pipes is closed.
In the invention, the steel pipe 1 is constructed by adopting a jacking method, and the direction of the steel pipe 1 needs to be controlled during jacking construction, so that the steel pipe does not deflect. Preferably, the adjacent steel pipes 1 are pushed in parallel and have equal spacing, and the length of the spacing is determined by construction requirements. The diameter of the steel pipe used in this embodiment is 0.8 to 1.0 m.
S102: and in the jacking process, soil bodies in the steel pipes and in the range covered by the adjacent steel pipe wing plates 11 are timely dug out, and the adjacent steel pipes are transversely connected by utilizing the connecting pieces.
In the embodiment of the present invention, each steel pipe 1 is provided with a plurality of preformed holes (not shown in the figure). The transverse connection of the adjacent steel pipes by using the connecting piece 14 is specifically as follows: the connecting piece 14 penetrates out of the preformed hole of the steel pipe in one steel pipe, penetrates into the preformed hole of the adjacent steel pipe, and reinforcing bolts are arranged at two ends of the connecting piece, so that the two adjacent steel pipes are connected. In the embodiment of the present invention, the connecting member 14 is a short reinforcing bar or an anchor bolt.
S103: and closing the two ends of the steel pipe and the two ends of the range covered by the adjacent steel pipe wing plates 11, and pouring concrete into the range covered by the steel pipe and the adjacent steel pipe wing plates 11, so that the mutually occluded steel pipes form an integrally stressed plate wall, namely the early-stage formwork construction support is formed.
After the adjacent steel pipes 1 are connected in sequence, the two ends of the range covered by the steel pipes and the adjacent steel pipe wing plates 11 are sealed by using the plugging plates. After the steel pipe and the area covered by the adjacent steel pipe wing plate 11 are closed, a concrete pouring pipe is inserted into one end, an exhaust pipe is inserted into the other end, and concrete is poured into the area covered by the steel pipe and the adjacent steel pipe wing plate 11 through the pouring pipe, so that the independent steel pipe forms an integrally stressed plate wall, namely the early-stage formwork construction support.
S104: after the advanced formwork primary support reaches the design strength, excavating soil bodies at the corresponding parts of beams and columns in a main structure in the underground engineering step by step, and timely constructing the beam and column structures in the main structure after the soil bodies are excavated so as to form a support for the primary support; and constructing each layer of slab and wall structure of the main structure along with the excavation of the soil body, thereby completing the underground excavation construction of the underground engineering.
Excavating soil bodies at corresponding parts of beams and columns in a main structure in the underground engineering step by step, and constructing the beam and column structures in the main structure in time after the soil bodies are excavated so as to form support for primary support; and constructing each laminate and wall structure of the main body structure along with the excavation of the soil body, comprising the following concrete steps:
the method comprises the steps of firstly, longitudinally excavating a first lower pilot tunnel 2 at a position corresponding to a bottom longitudinal beam of a main structure, longitudinally excavating a first small foundation pit 3 at the upper part of the bottom longitudinal beam and at a top longitudinal beam position corresponding to the bottom longitudinal beam, and excavating a first hole at a center column above the first lower pilot tunnel 2 between the first lower pilot tunnel 2 and the first small foundation pit 3. And constructing a bottom longitudinal beam lower waterproof plate 4 and a bottom longitudinal beam 5 in the excavated first lower pilot tunnel 2, constructing a first upright post 6 in the first hole, and constructing a top longitudinal beam top waterproof plate and a top longitudinal beam 7 in the first small foundation pit 3. Fig. 3 shows a structural schematic diagram of the bottom longitudinal beam, the first upright post and the top longitudinal beam after construction is completed.
And after the construction of one bottom longitudinal beam, the first upright post 6 and the top longitudinal beam 7 in the main body structure is finished, constructing one or more groups of beam and column structures in the same sequence.
Preferably, the main structure of the present invention comprises two sets of beam and column structures. And the other group of beam and column structures are respectively used as a bottom longitudinal beam, a top longitudinal beam 7 and a second upright column by excavating a second lower pilot tunnel, a second small foundation pit and a second hole at the middle column above the second lower pilot tunnel.
In the embodiment of the invention, the first lower pilot tunnel 2 and the second lower pilot tunnel are longitudinally excavated in a segmented manner by a step method, and the excavated first lower pilot tunnel 2 and the excavated second lower pilot tunnel are initially supported by a grid and sprayed concrete. Preferably, the first grids of the first lower pilot tunnel 2 and the second lower pilot tunnel are reserved with node plates, so that the bottom sealing grids between the subsequent pilot tunnels are conveniently connected.
And the side walls and the bottom plates of the first small foundation pit and the second small foundation pit are subjected to primary support by adopting grids and sprayed concrete, and the tops of the grids are welded with steel pipes of the advanced formwork primary support.
Further, soil between the first small foundation pit 3 and the second small foundation pit is excavated, and reinforced concrete is poured between the top longitudinal beam 75 of the first small foundation pit 3 and the top longitudinal beam 7 in the second small foundation pit, so that the two top longitudinal beams 7 are connected to form a mid-span top plate 8. Fig. 4 shows a schematic construction of the mid-span roof after the construction is completed.
The second step is that: and excavating the soil above the station hall layer middle plate in a longitudinal subsection manner, and constructing a reinforced concrete structure of the middle longitudinal beam 9 and the middle plate 10.
The third step: and after the middle longitudinal beam 9 and the middle plate 10 reach 80% of the design strength, excavating a mid-span soil body to the bottom of the underground engineering, constructing a mid-span bottom plate waterproof layer and pouring mid-span bottom plate concrete 11. Fig. 5 shows a schematic view of the construction of the mid-span floor after completion.
Preferably, in the process of excavating the mid-span soil body to the bottom of the underground engineering, after a part of the mid-span soil body is excavated, a temporary bracket support 12 for supporting the middle plate is erected below the middle plate, so that the construction safety is improved. Wherein, the temporary bracket support is fixed on the steel pipe of the forepoling.
The fourth step: and after the mid-span bottom plate concrete reaches 80% of the design strength, excavating the side-span soil body to the bottom of the underground engineering in a longitudinal segmentation manner, wherein the length of each section of the side-span soil body is not more than the side-span, and constructing a side-span bottom plate waterproof layer and pouring the side-span bottom plate concrete after the side-span soil body is excavated to the bottom of the underground engineering.
In the embodiment of the invention, after the design strength of each section of side-span bottom plate concrete reaches 80%, the next section of side-span soil body can be excavated, and a side-span bottom plate waterproof layer and side-span bottom plate concrete 13 are poured. Fig. 6 shows a schematic structural diagram of the side span floor after concrete pouring is finished.
The fifth step: and (4) constructing the remaining side wall of the station hall layer and the waterproof layer of the top plate, and pouring the remaining structures of the side wall and the top plate.
S105: and after the main body structure reaches the design strength, finishing the underground engineering construction.
According to the scheme, the construction method firstly carries out advanced formwork primary support before the soil body is excavated. The early-stage support is a wholly stressed plate wall formed by pouring concrete into the mutually occluded steel pipes and gaps among the steel pipes. Because the advanced formwork primary support supports the whole underground excavation construction working face, the strength of a soil body is not required, the influence of the excavation process on the ground is small, and even if the underground excavation construction method is in a weak stratum under severe conditions of shallow buried depth, large span, high underground water level and the like, the underground excavation construction method can still smoothly construct and well control the ground settlement. Therefore, the invention has the advantages of small ground settlement, high safety degree in the construction process and high degree of mechanization.
According to another aspect of the present invention, there is also provided a subway station. Fig. 7 shows a schematic structural view of an underground station. As shown in fig. 7, the underground station includes a steel pipe support 701, a roof 702, a middle plate 703, a floor 704, a first steel pipe column 705, a second steel pipe column 706, and both side walls 707 of a hall floor, wherein,
the steel pipe support 701 includes steel pipes 801 that engage with each other. Fig. 8 is a cross-sectional view showing the steel pipes engaged with each other in the steel pipe support frame. As shown in fig. 8, two wing plates 802 are welded to the left and right sides of a steel pipe 801, respectively, the two wing plates 802 are symmetrical with respect to the transverse axis of the steel pipe, the distance between the two wing plates 802 is smaller than the diameter of the steel pipe, and the wing plates 802 on the left and right sides are symmetrical with respect to the longitudinal axis of the steel pipe. The flanges 802 between adjacent steel pipes 801 are overlapped with each other to close the space between the adjacent steel pipes.
Meanwhile, a channel steel 803 is further welded between the two wing plates 802 and one side of the steel pipe 801, and a T-shaped engaging piece 804 is further welded between the two wing plates 802 and the other side of the steel pipe 801. The width of the upper end of the T-shaped engaging piece 804 is greater than the width of the gap of the channel 803.
Furthermore, each steel pipe 801 is provided with a plurality of prepared holes (not shown in the figure). The adjacent steel pipes are transversely connected by penetrating a connecting piece 805 into the reserved hole, wherein reinforcing bolts are arranged at two ends of the connecting piece 805. In the embodiment of the present invention, the connecting member 805 is a short steel bar or an anchor bolt.
The top plate 702, two side walls 707 of the station hall layer and the bottom plate 704 form a main support of the underground station;
the top plate 702 is provided with a first top longitudinal beam 708 and a second top longitudinal beam 709, the bottom plate 704 is provided with a first bottom longitudinal beam 710 and a second bottom longitudinal beam 711, and the first steel pipe column 705 is arranged between the first top longitudinal beam 708 and the first bottom longitudinal beam 710; the second steel pipe column 706 is arranged between the second top longitudinal beam 709 and the second bottom longitudinal beam 711;
middle longitudinal beams 712 are respectively arranged on two side walls 707 of the station hall layer, and the middle plate 703 is arranged between the middle longitudinal beams 712 of the two side walls 707.
The steel pipe support frame 701 is arranged on the periphery of the main support and used for supporting underground station underground excavation construction.
Further, a waterproof layer (not shown) is disposed between the steel pipe support 701 and the main support. The waterproof layers include a top plate 702 waterproof layer between the top plate 702 and the steel pipe support 701, a bottom plate 704 waterproof layer on the lower side of the bottom plate 704, and side wall waterproof layers between two side walls 707 of the station hall layer and the steel pipe support 701.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A subsurface excavation construction method for underground engineering comprises the following steps:
longitudinally jacking a plurality of steel pipes which are uniformly arranged, mutually occluded and welded with wing plates at the periphery in a working pit at the outer side of the underground engineering along the top of the underground engineering structure and the peripheries of two side edges;
in the jacking process, soil bodies in the steel pipes and in the range covered by the wing plates of the adjacent steel pipes are timely excavated, and the adjacent steel pipes are transversely connected by adopting a connecting piece;
closing the two ends of the steel pipe and the two ends of the range covered by the adjacent steel pipe wing plates, and pouring concrete into the range covered by the steel pipe and the adjacent steel pipe wing plates, so that the mutually occluded steel pipes form an integrally stressed plate wall, namely an advanced formwork primary support;
after the advanced formwork primary support reaches the design strength, a first lower pilot tunnel is longitudinally excavated at the part of one bottom beam of the main structure, and a bottom beam lower waterproof plate and a bottom longitudinal beam are constructed in the first lower pilot tunnel;
longitudinally excavating a first small foundation pit at the top longitudinal beam part which is above the first lower pilot tunnel and corresponds to the bottom beam, and constructing a top longitudinal beam top waterproof plate and a top longitudinal beam in the first small foundation pit; and
excavating a first hole at a center pillar above the first lower pilot tunnel between the first lower pilot tunnel and the first small foundation pit; constructing a first upright post for connecting the bottom longitudinal beam and the top longitudinal beam in the first hole;
constructing other one or more groups of bottom longitudinal beam, upright post and top longitudinal beam structures in the main body structure in the same sequence;
after the construction of a plurality of groups of bottom longitudinal beams, upright columns and top longitudinal beams in the main body structure is finished, excavating soil above the middle plate of the station hall layer in a longitudinal subsection mode, and constructing a reinforced concrete structure of the middle longitudinal beams and the middle plate;
after the middle longitudinal beam and the middle plate reach 80% of the design strength, excavating a mid-span soil body to the bottom of the underground engineering, constructing a mid-span bottom plate waterproof layer and pouring mid-span bottom plate concrete;
after the mid-span bottom plate concrete reaches 80% of the design strength, excavating side-span soil to the bottom of the underground engineering in a longitudinal subsection mode, wherein the length of each section is not larger than the side-span, and constructing a side-span bottom plate waterproof layer and pouring side-span bottom plate concrete; and after the side span bottom plate concrete reaches 80% of the design strength, longitudinally excavating a next section of side span soil body to the bottom of the underground engineering, and applying a side span bottom plate waterproof layer and pouring the side span bottom plate concrete.
2. The construction method according to claim 1, wherein the main structure of the underground engineering comprises two groups of bottom longitudinal beams, vertical columns and top longitudinal beam structures, and the other groups of bottom longitudinal beams, vertical columns and top longitudinal beams are respectively constructed after a second lower pilot tunnel, a second hole and a second small foundation pit are excavated; wherein,
an upright column between the bottom longitudinal beam in the second lower pilot tunnel and the top longitudinal beam in the second small foundation pit is a second upright column;
and after the top longitudinal beam is constructed and completed in the first small foundation pit and the second small foundation pit respectively, excavating the soil body between the first small foundation pit and the second small foundation pit to enable the first small foundation pit and the second small foundation pit to be communicated, and constructing a mid-span top plate.
3. The construction method according to claim 2, wherein the first and second lower pilot tunnels are supported by a grating and shotcrete, and
and the side walls and the bottom plates of the first small foundation pit and the second small foundation pit are supported by adopting grids and sprayed concrete.
4. The construction method according to claim 1, wherein each steel pipe is provided with a prepared hole, and the transverse connection of the adjacent steel pipes by adopting the connecting piece is specifically as follows:
the connecting piece penetrates out of the preformed hole of the steel pipe in one steel pipe and penetrates into the preformed hole of the adjacent steel pipe, and reinforcing bolts are arranged at the two ends of the connecting piece, wherein,
the connecting piece is a short steel bar or an anchor bolt.
5. The construction method according to claim 1, wherein a temporary bracket support for supporting the middle plate is erected below the middle plate after a part of the mid-span soil body is excavated during the excavation of the mid-span soil body to the bottom of the underground works,
the temporary bracket supports and is fixed on the steel pipe of the advanced formwork primary support.
6. The construction method according to claim 1, wherein both ends of the steel pipe and both ends of a range surrounded by the adjacent steel pipe flanges are closed by plugging plates; and
concrete pouring to the steel pipe and the range covered by the adjacent steel pipe wing plates specifically comprises the following steps:
and inserting a concrete pouring pipe into one end of the range covered by the steel pipe and the adjacent steel pipe wing plate, inserting an exhaust pipe into the other end of the range covered by the steel pipe and the adjacent steel pipe wing plate, and pouring concrete into the range covered by the steel pipe and the adjacent steel pipe wing plate through the pouring pipe.
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| CN201310201546.9A CN103244143B (en) | 2013-05-27 | 2013-05-27 | A kind of underground construction excavating construction method and underground station |
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| CN201310201546.9A CN103244143B (en) | 2013-05-27 | 2013-05-27 | A kind of underground construction excavating construction method and underground station |
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| CN104863597B (en) * | 2015-05-27 | 2018-03-02 | 北京市市政工程设计研究总院有限公司 | A kind of construction method transverse direction hole lid method in shallow buried covered excavation Large Underground space |
| CN104963705B (en) * | 2015-07-20 | 2017-10-27 | 上海市机械施工集团有限公司 | A kind of underground space tunneling construction method |
| CN107100653A (en) * | 2017-05-23 | 2017-08-29 | 中铁四局集团第五工程有限公司 | A kind of flat top wall pipe curtain structure builds the construction method of super Shallow Covered Metro Station |
| CN108930544A (en) * | 2018-07-27 | 2018-12-04 | 中铁十四局集团有限公司 | A kind of broken ground underground large space method of construction |
| CN111287759B (en) * | 2020-02-12 | 2021-08-24 | 中铁五局集团有限公司 | Shallow-buried close-connection underground excavation tunnel construction method |
| CN113279787B (en) * | 2021-05-24 | 2024-05-14 | 苏州大学 | Construction method for constructing pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station |
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| CN101349154A (en) * | 2007-07-18 | 2009-01-21 | 株式会社Ntsenc | Structure construction method for forming subterranean tunnel |
| CN101864959A (en) * | 2009-04-17 | 2010-10-20 | 中铁工程设计咨询集团有限公司 | Method for tunneling construction of main structure of underground station |
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| KR100834076B1 (en) * | 2006-09-18 | 2008-06-04 | 김현경 | None open cut tunnelling method and tunnel |
| KR100995384B1 (en) * | 2008-04-30 | 2010-11-19 | 김진수 | Parallelly connected iron tube assembly and construction method for underground structure using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101349154A (en) * | 2007-07-18 | 2009-01-21 | 株式会社Ntsenc | Structure construction method for forming subterranean tunnel |
| CN101864959A (en) * | 2009-04-17 | 2010-10-20 | 中铁工程设计咨询集团有限公司 | Method for tunneling construction of main structure of underground station |
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