CN112854238A - Open trench tunnel staged construction joint foundation pit supporting system and construction method thereof - Google Patents
Open trench tunnel staged construction joint foundation pit supporting system and construction method thereof Download PDFInfo
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- CN112854238A CN112854238A CN202110029200.XA CN202110029200A CN112854238A CN 112854238 A CN112854238 A CN 112854238A CN 202110029200 A CN202110029200 A CN 202110029200A CN 112854238 A CN112854238 A CN 112854238A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a foundation pit supporting system for a joint point of open trench tunnel staged construction and a construction method thereof, wherein the joint point supporting system for open trench tunnel staged construction comprises the following components: the first longitudinal enclosing purlin, the first longitudinal row piles and the first longitudinal waterproof curtain are arranged from inside to outside along the longitudinal direction of the early construction structure; the horizontal stagnant water curtain of second is located early construction structure's tip, first horizontal purlin and the horizontal stagnant water curtain interval setting of second, first horizontal stagnant water curtain is located later stage construction structure's tip, first horizontal row of piles and first horizontal purlin are located one side of first horizontal stagnant water curtain towards early construction structure, and first horizontal row of piles is located between first horizontal purlin and the first horizontal stagnant water curtain, the space between first horizontal purlin and the early construction structure can form the open transfer passage in top. Through above structure, can solve the tunnel and implement the impervious, precipitation, the stability problem of reserving hole and supporting system in stages, reduce the construction environment influence simultaneously.
Description
Technical Field
The invention relates to the technical field of multi-stage construction of an open-cut tunnel with bored piles in longitudinal direction, in particular to a foundation pit supporting system for a joint of stage construction of the open-cut tunnel and a construction method thereof.
Background
The improvement of urban traffic efficiency is common sound of citizens, and experience shows that the tunnel serving as a high-efficiency and environment-friendly traffic channel can be regarded as an effective means for improving the urban traffic efficiency due to the avoidance of the intersection of route planes, the centralized emission of waste gas and the control of noise pollution. For land areas and shallow water tunnels with large vehicle flow, the open cut method has considerable technical advantages and economic advantages, so that the open cut method becomes a preferred construction process. However, in urban areas, the traffic is complicated, municipal pipelines are complicated and disordered and often pass through a plurality of transverse intersections, and factors such as uninterrupted traffic demand and temporary pipeline relocation require that tunnel construction must be implemented in stages; in addition, for the long and large tunnel, the construction period is one of the main consideration factors, and the staged implementation of the whole tunnel divided into a plurality of construction sections also has higher recommended value.
The tunnel is divided into a plurality of construction sections to be implemented in stages, and a transverse plugging wall needs to be arranged between two adjacent sections, so that a closed supporting system is formed by the pits during early construction. In the construction in the closed area of earlier stage, need consider personnel and the passageway of material business turn over foundation ditch, from economic nature and constructor security consideration, reserve a hole, later stage shutoff when the roof is pour usually. Thus, a plurality of temporary struts are additionally arranged on the periphery of the hole on the lower edge of the top plate; meanwhile, the reserved holes are blocked by adopting expanded concrete, so that the process is complex and the blocking quality is difficult to control; a vertical construction joint inevitably exists on the top plate, and the leakage risk is increased.
Disclosure of Invention
The invention aims to overcome the defects that holes are reserved on a top plate during the staged construction of an open-cut tunnel in the prior art, the process is complex, and the later-stage plugging quality is difficult to control, and provides a foundation pit supporting system for a staged construction joint of the open-cut tunnel and a construction method thereof.
The invention solves the technical problems through the following technical scheme:
the utility model provides an open cut tunnel construction joint point underground structure supporting system in stages for strut earlier stage construction structure and later stage construction structure, earlier stage construction structure with later stage construction structure interval sets up on the length direction in tunnel, and the length direction in tunnel is longitudinal direction, and width direction is horizontal, and its characterized in that, supporting system includes:
the first longitudinal enclosing purlin, the first longitudinal row piles and the first longitudinal waterproof curtain are arranged from inside to outside along the transverse direction of the early construction structure;
the first transverse waterproof curtain, the first transverse row piles, the first transverse purlin and the second transverse waterproof curtain are arranged along the longitudinal direction of the early construction structure;
the second transverse water-stop curtain is located at the end of the early construction structure, the first transverse purlin and the second transverse water-stop curtain are arranged at intervals, the first transverse water-stop curtain is located at the end of the later construction structure, the first transverse row of piles and the first transverse purlin are located at one side, facing the early construction structure, of the first transverse water-stop curtain, and a transportation channel with an open top is formed between the first transverse purlin and the second transverse water-stop curtain.
The first longitudinal purlin is arranged close to the first longitudinal row of piles as a fulcrum of the support of the prior construction structure; the first transverse purlin is tightly attached to the first transverse row of piles. First horizontal row pile and first horizontal stagnant water curtain are located the tip of later stage construction structure to and earlier construction structure between have certain space, first horizontal purlin is the fulcrum that earlier construction structure foundation ditch supported, is located one side that first horizontal row pile is close to earlier construction structure. The empty space between the first transverse purlin and the early construction structure forms the transportation channel.
In the scheme, a first longitudinal waterproof curtain and a second transverse waterproof curtain are arranged in the longitudinal direction and the transverse direction of the early construction structure to form a closed waterproof curtain, so that the leakage of the early construction structure is prevented; first vertical purlin, first vertical row of stake, first horizontal row of stake and first horizontal purlin enclose earlier construction structure and enclose, be aided with interior support in order to guarantee going on smoothly of earlier construction structure. Form an open transport passage in top through setting up first horizontal row pile and the horizontal stagnant water curtain of second certain distance beyond the early construction structure scope for personnel and material get into the foundation ditch and provide the passageway, thereby avoided row pile to strut trompil on the long tunnel implementation early structure roof in stages so that daylighting, personnel's material transport and the seepage problem of the construction joint that causes. Through above structural style, can solve tunnel stage implementation and reserve hole and support system's impervious, precipitation, stability problem, reduce construction environment influence simultaneously.
Preferably, the open trench tunnel staged construction joint foundation pit supporting system further comprises a second longitudinal purlin, second longitudinal row piles and a second longitudinal waterproof curtain, wherein the second longitudinal purlin, the second longitudinal row piles and the second longitudinal waterproof curtain are arranged from inside to outside along the transverse direction of the later construction structure;
the second longitudinal waterproof curtain is in lap joint with the first longitudinal waterproof curtain, and the second longitudinal row of piles is continuous with the first longitudinal row of piles.
The second longitudinal purlin is arranged on the inner side of the second longitudinal row of piles, the inner support is used for supporting the second longitudinal row of piles, and the second longitudinal purlin is tightly attached to the second longitudinal row of piles.
Preferably, the second transverse waterproof curtain and the first longitudinal waterproof curtain are sleeved and perforated at the joint part to form a closed first waterproof curtain. Through beating first vertical waterproof curtain and first horizontal waterproof curtain at handing-over department cover, form continuous first waterproof curtain, appear impervious, gushing water problem when preventing earlier construction structure.
Preferably, the second transverse waterproof curtain and the first longitudinal waterproof curtain are sleeved and perforated at the joint part to form a closed second waterproof curtain.
Preferably, the first longitudinal waterproof curtain, the second transverse waterproof curtain, the second longitudinal waterproof curtain and the first transverse waterproof curtain all adopt triaxial soil cement mixing pile waterproof piles, and the triaxial soil cement mixing pile waterproof piles are lapped.
Preferably, the first longitudinal row pile, the first transverse row pile and the second longitudinal row pile all adopt drilled pile row piles.
Preferably, the distance between the first transverse purlin and the early construction structure is not less than 1 m.
Preferably, the second transverse waterproof curtain and the first transverse waterproof curtain are cut by the drilled piles at the junctions of the first longitudinal row piles and the second longitudinal row piles, and high-pressure jet grouting piles are arranged at the surfaces of the second transverse waterproof curtain and the first transverse waterproof curtain, which are cut by the drilled piles.
Preferably, a vertical column pile is further arranged in the post construction structure, the first transverse waterproof curtain is cut by the vertical column pile, and a high-pressure jet grouting pile is arranged at the surface of the first transverse waterproof curtain cut by the vertical column pile.
Preferably, corner supports are arranged at corners where the first transverse purlin and the first longitudinal purlin are connected.
Preferably, a first steel support is further arranged in the transverse direction of the later construction structure, and two ends of the first steel support are respectively abutted against the side faces of the second longitudinal enclosing purlins on two sides of the later construction structure.
A construction method of an open trench tunnel staged construction joint foundation pit supporting system is characterized in that the construction method is used for constructing the open trench tunnel staged construction joint foundation pit supporting system, and comprises the following steps:
s1, constructing a first longitudinal row pile and a first transverse row pile after the first longitudinal waterproof curtain, the second transverse waterproof curtain and the first transverse waterproof curtain are constructed, arranging a high-pressure jet grouting pile at the cut part of the second transverse waterproof curtain, and sealing the second transverse waterproof curtain; when the first transverse row piles are constructed, lattice column piles of a later construction structure can be constructed at the same time, and high-pressure jet grouting piles are arranged on the surfaces of the second transverse waterproof curtain cut by the column piles;
s2, excavating earthwork at the early construction structure from top to bottom, and arranging a first longitudinal purlin, a first transverse purlin and a corner support until the bottom of a foundation pit;
s3, paving a cushion layer at the bottom of the pit, and removing the first longitudinal purlin and the first transverse purlin from bottom to top as required to form a primary construction structure main body;
s4, after the second longitudinal waterproof curtain is constructed, constructing a second longitudinal row of piles; if the vertical column piles and the first transverse row piles are constructed simultaneously, constructing high-pressure jet grouting piles on the cutting surfaces of the vertical column piles and the first waterproof curtain;
s5, excavating earthwork at the later construction structure from top to bottom, arranging a second longitudinal purlin and a first steel support, and cutting the first transverse row piles and the first transverse waterproof curtain while excavating;
s6, the second longitudinal enclosing purlin extends to the inner side of the early construction structure through a turning enclosing purlin, and a second steel support is arranged on the inner side of the second longitudinal enclosing purlin on the inner side of the early construction structure, so that the second longitudinal enclosing purlin can effectively support second longitudinal row piles.
In the scheme, as the first transverse row piles and the first transverse waterproof curtain are moved outwards, when the early construction structure main body finishes the later-stage structural construction, and the first transverse row piles and the first transverse waterproof curtain are cut off, a plurality of second longitudinal row piles between the early construction structure main body and the later-stage construction structure foundation pit support are not supported, so that the first transverse row piles and the first transverse waterproof curtain are easy to tilt inwards; even if extend to earlier construction structure's tip with the vertical purlin of second, because the vertical purlin of second is close to earlier construction structure side tip and is in free state, it is right last the support intensity of the vertical row of stake of several second is far away not enough, still can lead to above-mentioned several row of stake can leanin, leads to the vertical waterproof curtain of second leanin to can lead to the seepage of second waterproof curtain. This scheme encloses the purlin through a turn and vertically encloses the purlin with the second and extends to the inboard of earlier construction structure to set up the second steel shotcrete in earlier construction structure inboard, form a complete supporting system, avoided above-mentioned some vertical row of second pile not have horizontal displacement that the supporting leads to too big, appear crack seepage scheduling problem between the stake.
Preferably, the turning purlin includes a first supporting section, a second supporting section and a third supporting section, the first supporting section and the third supporting section extend along the longitudinal direction, in the transverse direction, the first supporting section and the third supporting section are arranged at intervals, two ends of the second supporting section are respectively fixed with end portions of the first supporting section and the third supporting section, one end of the first supporting section departing from the second supporting section extends to an end portion of the second longitudinal purlin, one end of the third supporting section departing from the second supporting section extends to be in lap joint with an inner side of the prior construction structure, and an inner side of the third supporting section is supported by at least one second steel support.
Preferably, the first supporting section, the second supporting section and the third supporting section each include two section steel base materials arranged at intervals and a plurality of first reinforcing plates, the plurality of first reinforcing plates are arranged at intervals along the length direction of the section steel base materials, and two ends of each first reinforcing plate are connected to two side walls of the section steel base materials respectively.
Preferably, second reinforcing plates are fixed to both ends of the two section steel base materials in the length direction.
Preferably, the second support section further comprises a third reinforcing plate, the third reinforcing plate is located between the two section steel base materials and connected with the first reinforcing plate, and the extending direction of the third reinforcing plate is consistent with the extending direction of the section steel base materials.
Preferably, the folding purlin further comprises two fourth reinforcing plates, and one fourth reinforcing plate is fixed to one side of the first support section, which faces one end of the second support section, and faces one side of the third support section; the other fourth reinforcing plate is fixed with the second supporting section and the third supporting section and is positioned on one side facing the first supporting section.
Preferably, the turning surrounding purlin further comprises at least two fifth reinforcing plates, the fifth reinforcing plates are arranged at intervals along the height direction of the turning surrounding purlin, and two adjacent side surfaces of the fifth reinforcing plates are respectively fixed to the side surfaces of the two fourth reinforcing plates.
Preferably, in step S6, the first support section is connected to the second longitudinal purlin, the side surfaces of the third support sections abut against the inner side of the main body of the prior construction structure, a second steel support is disposed between the two third support sections in the transverse direction, two ends of the second steel support abut against the side surfaces of the two third support sections, respectively, a first steel support is disposed between the two first support sections, and two ends of the first steel support abut against the side surfaces of the two second support sections, respectively.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: according to the open-cut tunnel staged construction joint foundation pit supporting system, the first transverse row piles and the first transverse waterproof curtain are arranged outside the range of the prior construction structure at a certain distance to form a transportation channel with an open top, so that a channel is provided for personnel and materials to enter a foundation pit, and the problem of leakage of a construction joint caused by opening holes in a top plate of the prior structure in staged implementation of a long tunnel for pile supporting so as to facilitate lighting and personnel material transportation is solved. In order to achieve the effect, a first longitudinal waterproof curtain and a first transverse waterproof curtain are arranged in the longitudinal direction and the transverse direction of the early construction structure to form a closed waterproof curtain, so that the leakage of the early construction structure is prevented; the first longitudinal enclosing purlin, the first longitudinal row piles, the first transverse row piles and the first transverse enclosing purlin enclose the early construction structure so as to guarantee the smooth proceeding of the early construction structure.
The second transverse waterproof curtain and the first longitudinal waterproof curtain are bound together, and the first transverse waterproof curtain and the second longitudinal waterproof curtain are bound together. Meanwhile, according to a conventional construction sequence, longitudinal row piles (upright piles) are constructed later than waterproof curtain piles, and high-pressure jet grouting piles are required to be additionally arranged on cutting surfaces of the longitudinal row piles and the waterproof curtain to be firmly sealed.
Drawings
Fig. 1 is a schematic structural view of a foundation pit supporting system of a joint for staged construction of an open-cut tunnel according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a foundation pit supporting system of a joint of open trench tunnel staged construction in the process of forming an early construction structure according to a preferred embodiment of the present invention.
Fig. 3 is a schematic structural view of a foundation pit support system of a joint of the open cut tunnel in the staged construction after the primary construction structural body is connected with the second longitudinal purlin according to the preferred embodiment of the invention.
Fig. 4 is a schematic structural diagram of a turning surrounding purlin in a foundation pit supporting system of an open trench tunnel staged construction joint according to a preferred embodiment of the invention.
Fig. 5 is a partially enlarged structural view of a turning surrounding purlin in the foundation pit supporting system of the open trench tunnel staged construction joint according to the preferred embodiment of the present invention.
Fig. 6 is a schematic flow chart of a construction method of a foundation pit supporting system of a joint for staged construction of an open-cut tunnel according to a preferred embodiment of the present invention.
Description of reference numerals:
First longitudinal purlin 11
First longitudinal row of piles 12
First longitudinal waterproof curtain 13
First transverse purlin 14
First transverse row of piles 15
A second transverse water-stop curtain 16
Pre-construction structural body 19
Later stage construction structures 2
Second longitudinal purlin 21
Second longitudinal row of piles 22
Second longitudinal waterproof curtain 23
First transverse waterproof curtain 24
High-pressure jet grouting pile 3
First reinforcing plate 44
Second reinforcing plate 45
Third reinforcing plate 46
Fourth reinforcing plate 47
Fifth reinforcing plate 48
Detailed Description
The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.
As shown in fig. 1 to 5, the present embodiment provides an open trench tunnel staged construction joint foundation pit supporting system, which is used for supporting an early construction structure 1 and a later construction structure 2, wherein the early construction structure 1 and the later construction structure 2 are arranged at intervals in the length direction of the tunnel, the length direction of the tunnel is the longitudinal direction, and the width direction of the tunnel is the transverse direction. As shown in fig. 1 to 3, the left-right direction is a longitudinal direction, and the up-down direction is a lateral direction. Open cut tunnel staged construction joint point foundation pit support system includes: the first longitudinal purlin 11, the first longitudinal row piles 12 and the first longitudinal waterproof curtain 13 are arranged from inside to outside along the longitudinal direction of the early construction structure; the second transverse waterproof curtain 16, the first transverse purlin 14, the first transverse row piles 15 and the first transverse waterproof curtain 24 are sequentially arranged along the transverse direction of the prior construction structure; wherein, the horizontal waterproof curtain 16 of second is located the tip of earlier construction structures 1, first horizontal purlin 14 sets up with the horizontal waterproof curtain 16 interval of second, first horizontal waterproof curtain 24 is located the tip of later construction structures 2, first horizontal row of piles 15 and first horizontal purlin 14 are located one side of first horizontal waterproof curtain 24 towards earlier construction structures 1, and first horizontal row of piles 15 is located between first horizontal purlin 14 and the first horizontal waterproof curtain 24, form an open transport passage 17 in top between first horizontal purlin 14 and the earlier construction structures 1.
In the scheme, a first longitudinal waterproof curtain 13 and a first transverse waterproof curtain 24 are arranged in the longitudinal direction and the transverse direction of the early construction structure 1 to form a closed waterproof curtain, so that pit leakage in the early construction structure 1 is prevented; the first longitudinal enclosing purlin 11, the first longitudinal row piles 12, the first transverse row piles 15 and the first transverse enclosing purlin 14 enclose the early construction structure 1 so as to guarantee stable stress of foundation pit construction of the early construction structure 1. A transportation channel 17 with an open top is formed at a certain distance outside the range of the early construction structure 1 by arranging a first transverse row pile 15 and a first transverse waterproof curtain 24 to provide a channel for personnel and materials to enter a foundation pit, so that the problem of leakage of a construction joint caused by opening holes in a top plate of the early construction structure to facilitate lighting and personnel material transportation in stages of a long pile supporting tunnel is solved. Through above structural style, can solve the seepage hidden danger that the structure roof shrinkage porosity brought when the tunnel implements 1 foundation ditch construction of early structure in stages and the impervious, precipitation, the stability problem of supporting system, reduce the construction environment influence simultaneously.
Certainly, the open trench tunnel staged construction joint foundation pit supporting system further comprises a second longitudinal purlin 21, a second longitudinal row of piles 22 and a second longitudinal waterproof curtain 23 which are arranged from inside to outside along the longitudinal direction of the later construction structure 2; the second longitudinal waterproof curtain 23 is overlapped with the first longitudinal waterproof curtain 13, and the second longitudinal row of piles 22 are positioned between the second longitudinal waterproof curtain 23 and the second longitudinal purlin 21 and are continuously connected with the first longitudinal row of piles 12.
In this embodiment, in order to further improve the anti-seepage effect of the prior construction structure 1, the second transverse water-stop curtain 16 and the first longitudinal water-stop curtain 13 are at least perforated and formed as a closed first water-stop curtain at the junction to further improve the anti-seepage effect of the prior construction structure 1. Similarly, the first transverse waterproof curtain 24 and the second longitudinal waterproof curtain 23 are also at least sleeved with a hole at the joint and form a closed second waterproof curtain.
The first longitudinal waterproof curtain 13, the second transverse waterproof curtain 16, the second longitudinal waterproof curtain 23 and the first transverse waterproof curtain 24 respectively comprise a plurality of triaxial soil-cement mixing pile waterproof piles, and the waterproof piles are connected in an overlapping mode. The waterproof curtain is a three-axis cement soil mixing pile, and a lapping process is adopted between two adjacent three-axis cement soil mixing piles so as to improve the sealing performance of the waterproof curtain.
In order to allow sufficient space for the entry of personnel and materials, in this embodiment it is ensured that, in addition to the first purlin of the previous construction structure 1, there is more than 1m open space, i.e. the width of the transport channel 17 is not less than 1m, which makes the first transverse purlin 14 spaced from the first construction structure 1 by a distance not less than 1 m. The distance between the first transverse row of piles 15 and the previously constructed structure 1 is then the width of the first transverse purlin 14 and the width of the transport channel 17.
In the present embodiment, the first longitudinal row piles 12, the first transverse row piles 15 and the second longitudinal row piles 22 are drilled piles. In order to complete the construction smoothly, the water-stopping piles are generally driven first, and then the drilled piles are driven. The second transverse waterproof curtain 16 and the first longitudinal waterproof curtain 13 are sleeved to form a closed waterproof curtain, and the first transverse waterproof curtain 24 and the second longitudinal waterproof curtain 23 are sleeved to form a closed waterproof curtain. And because the first longitudinal waterproof curtain 13 and the second longitudinal waterproof curtain 23 are arranged at the outer sides of the first longitudinal row pile 12 and the second longitudinal row pile 22, when the first longitudinal row pile 12 and the second longitudinal row pile 22 are constructed, the second transverse waterproof curtain 16 and the first transverse waterproof curtain 24 are inevitably cut, in the embodiment, in order to keep the sealing performance of the first waterproof curtain and the second waterproof curtain, the high-pressure jet grouting piles 3 are arranged on the cut surfaces of the second transverse waterproof curtain 16 and the first transverse waterproof curtain 24, so as to block the cut surfaces of the waterproof curtains. Of course, the number of the high-pressure jet grouting piles 3 is not limited so as to seal the cut surface. Still set up the stand stake 25 in later stage construction structure 2, stand stake 25 is located later stage construction structure 2's horizontal direction, if it implements with first horizontal campshed simultaneously, should consider that first horizontal waterproof curtain 24 is cut by stand stake 25, sets up high-pressure jet grouting pile 3 in the face department of cutting. Wherein, the central point of the high-pressure jet grouting pile 3 is tightly attached to the thinnest point formed by cutting the waterproof curtain as much as possible, and the elevation of the high-pressure jet grouting pile 3 is as deep as the waterproof curtain.
In order to enhance the connection stability of the first transverse purlin 14 and the first longitudinal purlin 11, corner supports 18 are arranged at the corners where the first transverse purlin 14 and the first longitudinal purlin 11 are connected. In order to enhance the stability of the second longitudinal purlin 21, a first steel support 26 is further arranged in the transverse direction of the later construction structure 2, and two ends of the first steel support respectively abut against the side faces of the second longitudinal purlin 21 on two sides of the later construction structure 2 so as to prevent the second longitudinal purlin 21 and the second longitudinal row piles 22 from inclining inwards.
As shown in fig. 6, the present embodiment further provides a construction method of an open trench tunnel staged construction joint foundation pit support system, which is used for constructing the open trench tunnel staged construction joint foundation pit support system, and includes the following steps:
s1, constructing the first longitudinal water stop curtain 13, the second transverse water stop curtain 16 and the first transverse water stop curtain 24. It should be noted that when the first longitudinal waterproof curtain 13, the second transverse waterproof curtain 16 and the first transverse waterproof curtain 24 are constructed, a hole is ensured to be punched in the sleeve at the corner point where the longitudinal waterproof curtain and the transverse waterproof curtain meet. Constructing a first longitudinal row pile 12 and a first transverse row pile 15, if considering that a vertical column pile 25 of a later construction structure and the first transverse row pile 15 are implemented at the same time (the distance is short and the vertical column pile can be taken along the same situation), cutting the second transverse waterproof curtain 16 possibly by the vertical column pile 25, arranging a high-pressure jet grouting pile 3 at the cut part, and sealing the second transverse waterproof curtain 16;
s2, excavating foundation pit earthwork at the early construction structure 1 from top to bottom according to the construction process of the tunnel, and arranging a first longitudinal enclosing purlin 11, a first transverse enclosing purlin 14 and supports (including corner supports 18);
s3, after the excavation is finished, constructing a bottom plate, a side wall and a top plate of the prior construction structure 1, forming a prior construction structure main body 19, and dismantling a first longitudinal enclosing purlin 11 and a first transverse enclosing purlin 14 from bottom to top according to requirements;
and S4, constructing the second longitudinal water-stopping surrounding purlin, and constructing the second longitudinal row piles 22 and the upright piles 25. If the vertical column piles 25 and the first transverse row piles 15 are implemented simultaneously, the first transverse waterproof curtain 24 can be cut off during construction to form gaps for water leakage, and the high-pressure jet grouting piles 3 are arranged on the surfaces, cut by the vertical column piles 25, of the first transverse waterproof curtain 24;
s5, excavating foundation pit earthwork at the later construction structure 2 from top to bottom according to the construction process of the open cut tunnel, arranging a second longitudinal enclosing purlin 21 and a first steel support 26, and cutting off a first transverse row pile 15 and a first transverse waterproof curtain 24 while excavating;
s6, extending the second longitudinal enclosing purlin 21 to the inner side of the early construction structure 19 through a turning enclosing purlin 4, and arranging the second steel supports 5 on the inner side of the early construction structure 19 and arranging the first steel supports 26 on the inner side of the second longitudinal enclosing purlin 21 to enable the second longitudinal enclosing purlin and the turning enclosing purlin 4 to be continuous, so that the second longitudinal row of piles 22 can be effectively supported.
In this embodiment, because the column pile 25 is not allowed to cause unbalance loading, only one second steel support 5 can be arranged on one side of the column pile 25, the second longitudinal purlin 21 cannot be too long for a cantilever, and because the first transverse row pile 15 and the first transverse waterproof curtain 24 are moved outwards, the construction of the early-stage structure is completed, and after the first transverse row pile 15 and the first transverse waterproof curtain 24 are cut off along with the excavation of the foundation pit of the later-stage construction structure, a plurality of drilled pile rows of the second longitudinal row pile 22 at the joint position between the early-stage construction structure main body 19 and the later-stage construction structure 2 cannot be supported, so that the row piles are unstable and are easy to tilt inwards; even if extend to the tip of earlier construction structures 1 with second vertical purlin 21, because the tip of second vertical purlin 21 is in free state, its support intensity to second vertical row of piles 22 is far away not enough, still can lead to being located several drilled piles between earlier construction structures 1 and later stage construction structures 2 and can inwards incline, lead to the inside slope of second vertical waterproof curtain 23 to can lead to the second waterproof curtain seepage. In order to facilitate understanding of the technical scheme of the embodiment, it is assumed that the first longitudinal row piles 12 and the first transverse row piles 15 of the tunnel are surrounded by row pile drilled piles of 1m, the first longitudinal enclosing purlins 11, the first transverse enclosing purlins 14, the second transverse enclosing purlins and the second longitudinal enclosing purlins 21 are formed by double-spliced H700 300 13 24 profile steel, the minimum value of 1m is obtained when the early construction structure 1 is constructed and a material access, and the distance between the edge of the early construction structure 1 and the nearest support of the foundation pit of the later construction structure 2 is not less than 2.7m according to the specification requirement. Then, at least 3-4 row pile supporting piles can not be effectively supported. If above-mentioned campshed can't be effectively supported, when digging the foundation ditch to later stage construction structure 2, will lead to several bored concrete piles to inwards incline, and then lead to the vertical waterproof curtain of second 23 to inwards move to lead to the seepage of second waterproof curtain.
This scheme encloses purlin 4 through design a turn, vertically encloses purlin 21 with the second and is connected with turn purlin 4, through setting up second steel shotcrete 5, first steel shotcrete 26, can form continuous supporting effect, has avoided many drilled piles to support the horizontal displacement that unstable leads to among the vertical row of stake 22 of second earlier construction structure and the first steel shotcrete too big, the fracture seepage scheduling problem appears between the stake.
The construction method of the open trench tunnel staged construction joint foundation pit supporting system provided by the embodiment comprises the steps of constructing the first longitudinal waterproof curtain 13, the second transverse waterproof curtain 16 and the first transverse waterproof curtain 24 firstly, so that the continuous waterproof curtain is formed below the early construction structure 1, underground water below the early construction structure 1 cannot flow into a later foundation pit during subsequent construction, the precipitation range and the water pumping amount are reduced, the risk of holes and settlement caused by water and soil loss below the early construction structure 1 is reduced, and the problem of settlement of the surrounding environment caused by excessive precipitation is avoided.
In this embodiment, the second longitudinal purlin 21 that encloses adopts the double pin H shaped steel (or single H shaped steel), can be provided with the batten plate in two H shaped steel length direction ground at intervals, wherein, the both ends of batten plate and the edge of a wing welding of H shaped steel to vertically enclose purlin 21 to the second and strengthen.
In step S6, as shown in fig. 4, the folding purlin 4 includes a first supporting section 41, a second supporting section 42, and a third supporting section 43 from right to left, the first supporting section 41 and the third supporting section 43 extend along the longitudinal direction, in the transverse direction, the first supporting section 41 and the third supporting section 43 are disposed at an interval, two ends of the second supporting section 42 are respectively fixed with ends of the first supporting section 41 and the third supporting section 43, one end of the first supporting section facing away from the second supporting section extends to an end of the second longitudinal purlin, one end of the third supporting section facing away from the second supporting section extends to an inner side of the previous construction structure and is overlapped with the inner side, and the inner side of the third supporting section supports at least one second steel support. The third support section 43 is positioned on the inner side of the early construction structure main body 19, and the length of the third support section can meet the requirement of arranging at least 1 first steel support; the first supporting section 41 is connected with the end part of the second longitudinal purlin 21, so that the turning purlin 4 is set into "
And (4) type. Influenced by the transverse plugging wall, the upright piles 25 in the later construction structure 2 must be apart from the second transverse waterproof curtain by 2% H, wherein H is the height of the longer pile in the row piles of the upright piles and the transverse dividing wall.
Wherein, first support section 41, second support section 42 and third support section 43 all include two shaped steel base materials 49 and a plurality of first reinforcing plate 44 that the interval set up, and a plurality of first reinforcing plate 44 set up along the length direction interval of shaped steel base materials, and the spacing distance between per two first reinforcing plate 44 is not more than 1.5m, and the both ends of first reinforcing plate 44 are connected respectively in the flange of two shaped steel base materials. In this example, the base material of the section steel was H-shaped steel. In the embodiment, the H-shaped steel can be H700 multiplied by 300 multiplied by 13 multiplied by 24, wherein the height of the web plate of the H-shaped steel is 700mm, the width of the flange plate is 300mm, the thickness of the web plate is 13mm, and the thickness of the flange plate is 24 mm. The second longitudinal purlin 21 also adopts H-shaped steel with the same model. That is, the basic structures of the first supporting section 41 and the second supporting section 42 of the turning purlin 4 are the same as the structure of the second longitudinal purlin 21, and the difference is that the second reinforcing plates 45 are fixed at the two ends of the two section steel base materials, that is, the two ends of the H-shaped steel in the length direction. The thickness of the second reinforcing plate 45 is not less than 20mm, the second reinforcing plate 45 and the first reinforcing plate 44 are the same in size and dimension, the second reinforcing plate 45 is welded with flanges and webs of the end portions of the H-shaped steel, and the height of a welding seam of the second reinforcing plate 45 is not less than 8 mm. And the other side surface of the second reinforcing plate 45 is welded to the flange of the H-section steel of the second support section 42. The second reinforcing plate 45 reinforces the strength of the first and second support sections 41 and 42, on the one hand, and allows the ends of the first and second support sections 41 and 42 to form a large connecting surface to facilitate connection with the second support section 42, on the other hand. Of course, the second reinforcing plates 45 are also provided at both ends of the second and third support sections 42 and 43.
In the present embodiment, the second support section 42 is used for connecting the first support section 41 and the second support section 42, which requires higher strength, and in order to improve the strength of the second support section 42, the second support section 42 further includes a third reinforcing plate 46, the third reinforcing plate 46 is located between the two base materials of the section steel and connected to the first reinforcing plate 44, and the extending direction of the third reinforcing plate 46 coincides with the extending direction of the base materials of the section steel.
In order to improve the connection strength between the first supporting section 41 and the third supporting section 43 in the whole turning surrounding purlin 4, at least two fifth reinforcing plates 48 are connected at the internal corner formed after the first supporting section 41, the second supporting section 42 and the third supporting section 43 are connected, and the fifth reinforcing plates 48 are arranged at intervals along the height direction of the turning surrounding purlin 4. In order to realize that the fifth reinforcing plate 48 is connected with the first supporting section 41, the second supporting section 42 and the third supporting section 43, a fourth reinforcing plate 47 is arranged at the turning point of the turning surrounding purlin 4 to be used as a foundation of the fifth reinforcing plate 48. That is, the folding purlin 4 further includes two fourth reinforcing plates 47, and one fourth reinforcing plate 47 is fixed to one end of the first supporting section 41 facing the second supporting section 42 and one side facing the third supporting section 43; a further fourth reinforcing plate 47 is fixed to both the second support section 42 and the third support section 43 and is located on the side facing the first support section 41. Two adjacent side surfaces of the fifth reinforcing plate 48 are fixed to the side surfaces of the fourth reinforcing plates 47, respectively. The fifth reinforcing plate 48 is arranged at the internal corner of the turning surrounding purlin 4, so that the bending resistance and the shearing resistance of the turning surrounding purlin 4 are enhanced.
In step S6, the first supporting segments 41 are connected to the second longitudinal purlin, the side surfaces of the third supporting segments 43 abut against the inner side of the construction structure body 19, the first steel supports 26 are disposed between the two first supporting segments 41 in the transverse direction, and the two ends of the second steel supports 5 abut against the side surfaces of the two third supporting segments 43 respectively. The two ends of the second steel supports 5 are respectively abutted against the side face of the early construction structure, and the first steel supports 26 support the second longitudinal enclosing purlin, so that the turning enclosing purlin 4 and the second longitudinal enclosing purlin continuous body can be stably kept under the supporting action of the second steel supports 5 and the first steel supports 26, and further the inward inclination of the row pile drilling piles and the leakage of the foundation pit are prevented from being supported on the outer side.
In the present embodiment, in order to solve the problem of the prepared hole of the pre-construction structure, the first transverse row piles 15 and the first transverse waterproof curtain 24 of the pre-construction structure 1 are moved outwards, thereby avoiding the problem of leaving a permanent construction joint on the structural roof and the like.
At the same time, during post construction, it is skillfully adopted "
The structural measure of the' type turning surrounding purlin solves the problem of stress on the row pile drilled pile. Meanwhile, the construction method provided by the embodiment does not need to introduce other machines and materials to enter the field, so that the safety of foundation pit construction is greatly improved, the construction efficiency is improved, the operation environment of operators is improved, the construction cost can be further saved, and the adverse effect on the environment can be reduced.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (19)
1. The utility model provides an open cut tunnel construction joint point underground structure supporting system in stages for strut earlier stage construction structure and later stage construction structure, earlier stage construction structure with later stage construction structure interval sets up on the length direction in tunnel, and the length direction in tunnel is longitudinal direction, and width direction is horizontal direction, its characterized in that, supporting system includes:
the first longitudinal enclosing purlin, the first longitudinal row piles and the first longitudinal waterproof curtain are arranged from inside to outside along the transverse direction of the early construction structure;
the first transverse waterproof curtain, the first transverse row piles, the first transverse purlin and the second transverse waterproof curtain are arranged from outside to inside along the longitudinal direction of the early construction structure;
the second transverse water-stop curtain is located at the end of the early construction structure, the first transverse purlin and the second transverse water-stop curtain are arranged at intervals, the first transverse water-stop curtain is located at the end of the later construction structure, the first transverse row of piles and the first transverse purlin are located at one side, facing the early construction structure, of the first transverse water-stop curtain, and a transportation channel with an open top is formed between the first transverse purlin and the early construction structure.
2. The open trench tunnel staged construction joint foundation pit support system according to claim 1, further comprising a second longitudinal purlin, a second longitudinal row of piles and a second longitudinal waterproof curtain arranged from inside to outside along the longitudinal direction of the post construction structure;
the second longitudinal waterproof curtain and the second longitudinal enclosing purlin are arranged at intervals and are in lap joint with the first longitudinal waterproof curtain, and the second longitudinal row piles are located between the second longitudinal waterproof curtain and the second longitudinal enclosing purlin and are adjacent to the first longitudinal row piles.
3. The open trench tunnel staged construction joint excavation supporting system of claim 1, wherein the second transverse waterproof curtain and the first longitudinal waterproof curtain are at least one hole drilled and formed as a closed first waterproof curtain at a junction.
4. The open trench tunnel staged construction joint excavation supporting system of claim 2, wherein the first transverse waterproof curtain and the second longitudinal waterproof curtain are at least one hole drilled and formed as a closed second waterproof curtain at a junction.
5. The open trench tunnel staged construction joint excavation supporting system of claim 2, wherein the first longitudinal water stop curtain, the second transverse water stop curtain, the second longitudinal water stop curtain, and the first transverse water stop curtain each include a plurality of water stop piles, and the water stop piles overlap.
6. The open trench tunnel staged construction joint excavation supporting system of claim 1, wherein the first transverse purlin is spaced from the prior construction structure by a distance of not less than 1 m.
7. The open-cut tunnel staged construction joint foundation pit supporting system according to claim 2, wherein the first longitudinal row pile, the first transverse row pile and the second longitudinal row pile are all drilled pile row piles.
8. The open trench tunnel staged construction joint excavation supporting system of claim 7, wherein the second transverse water-stop curtain and the first transverse water-stop curtain are cut by the bored piles at the junctions with the first longitudinal row piles, the second longitudinal row piles, and high pressure jet grouting piles are provided at the faces of the second transverse water-stop curtain and the first transverse water-stop curtain cut by the bored piles.
9. The open trench tunnel staged construction joint excavation supporting system according to claim 2, wherein a post pile is further provided in the post construction structure, the post pile is located in a lateral direction of the post construction structure, the first lateral water stop curtain is cut by the post pile, and a high pressure jet grouting pile is provided at a face of the first lateral water stop curtain cut by the post pile.
10. The open trench tunnel staged construction joint excavation supporting system of claim 1, wherein corner braces are provided at corners where the first transverse purlin and the first longitudinal purlin meet.
11. The open trench tunnel staged construction joint foundation pit supporting system according to claim 2, wherein a first steel support is further arranged in the transverse direction of the post construction structure, and two ends of the first steel support are respectively abutted against the side faces of the second longitudinal enclosing purlins on two sides of the post construction structure.
12. A construction method of an open trench tunnel staged construction joint foundation pit support system, which is used for constructing the open trench tunnel staged construction joint foundation pit support system according to any one of claims 1-11, and comprises the following steps:
s1, constructing a first longitudinal row pile and a first transverse row pile after the first longitudinal waterproof curtain, the second transverse waterproof curtain and the first transverse waterproof curtain are constructed, arranging a high-pressure jet grouting pile at the cut part of the second transverse waterproof curtain, and sealing the second transverse waterproof curtain; when the first transverse row piles are constructed, lattice column piles of a later construction structure can be constructed at the same time, and high-pressure jet grouting piles are arranged on the surfaces of the second transverse waterproof curtain cut by the column piles;
s2, excavating earthwork at the early construction structure from top to bottom, and arranging a first longitudinal purlin, a first transverse purlin and a corner support until the bottom of a foundation pit;
s3, paving a cushion layer at the bottom of the pit, and removing the first longitudinal purlin and the first transverse purlin from bottom to top as required to form a primary construction structure main body;
s4, after the second longitudinal waterproof curtain is constructed, constructing a second longitudinal row of piles; if the vertical column piles and the first transverse row piles are constructed simultaneously, constructing high-pressure jet grouting piles on the cutting surfaces of the vertical column piles and the first waterproof curtain;
s5, excavating earthwork at the later construction structure from top to bottom, arranging a second longitudinal purlin and a first steel support, and cutting the first transverse row piles and the first transverse waterproof curtain while excavating;
s6, the second longitudinal enclosing purlin extends to the inner side of the early construction structure through a turning enclosing purlin, and a second steel support is arranged on the inner side of the second longitudinal enclosing purlin on the inner side of the early construction structure, so that the second longitudinal enclosing purlin can effectively support second longitudinal row piles.
13. The method of constructing an open trench tunnel staged construction joint pit supporting system according to claim 12, wherein in step S6, the turning purlin includes a first bracing section, a second bracing section and a third bracing section, the first bracing section and the third bracing section extend along a longitudinal direction, the first bracing section and the third bracing section are arranged at intervals in a transverse direction, two ends of the second bracing section are respectively fixed with the ends of the first bracing section and the third bracing section, one end of the first bracing section departing from the second bracing section extends to the end of the second longitudinal purlin, one end of the third bracing section departing from the second bracing section extends to overlap with the inner side of the previous construction structure, and the inner side of the third bracing section is at least supported by the second steel bracing.
14. The method of constructing an open trench tunnel staged construction joint foundation pit support system according to claim 13, wherein the first support section, the second support section and the third support section each comprise two spaced apart profiled steel base materials and a plurality of first reinforcement plates, the plurality of first reinforcement plates are spaced apart along a length direction of the profiled steel base materials, and both ends of the first reinforcement plates are respectively connected to sidewalls of the two profiled steel base materials.
15. The method of constructing an open trench tunnel staged construction joint foundation pit supporting system according to claim 14, wherein second reinforcing plates are fixed to both lengthwise ends of both of the profiled steel base materials.
16. The method of constructing an open trench tunnel staged construction joint excavation supporting system according to claim 15, wherein the second support section further comprises a third reinforcement plate, the third reinforcement plate is located between the two section steel base materials and connected to the first reinforcement plate, and the third reinforcement plate extends in the same direction as the section steel base materials.
17. The method of constructing an open trench tunnel staged construction joint pit bracing system according to claim 14, wherein the break purlin further comprises two fourth reinforcing plates, one of the fourth reinforcing plates being fixed to the first support section towards one end of the second support section and towards one side of the third support section; the other fourth reinforcing plate is fixed with the second supporting section and the third supporting section and is positioned on one side facing the first supporting section.
18. The construction method of a foundation pit supporting system for an open trench tunnel staged construction joint as claimed in claim 17, wherein the turning surrounding purlin further comprises at least two fifth reinforcing plates, the fifth reinforcing plates are arranged at intervals along the height direction of the turning surrounding purlin, and two adjacent side surfaces of the fifth reinforcing plates are respectively fixed to the side surfaces of the two fourth reinforcing plates.
19. The construction method of a foundation pit supporting system for an open trench tunnel staged construction joint according to claim 14, wherein in step S6, the first supporting segments are connected with the second longitudinal purlin, the side surfaces of the third supporting segments abut against the inner side of the prior construction structural body, in the transverse direction, a second steel brace is arranged between the two third supporting segments, the two ends of the second steel brace respectively abut against the side surfaces of the two third supporting segments, a first steel brace is arranged between the two first supporting segments, and the two ends of the first steel brace respectively abut against the side surfaces of the two second supporting segments.
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