CN107574836B - Construction structure and construction method for crossing urban road underground passage - Google Patents

Construction structure and construction method for crossing urban road underground passage Download PDF

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Publication number
CN107574836B
CN107574836B CN201710723576.4A CN201710723576A CN107574836B CN 107574836 B CN107574836 B CN 107574836B CN 201710723576 A CN201710723576 A CN 201710723576A CN 107574836 B CN107574836 B CN 107574836B
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road
construction
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underground passage
reinforced concrete
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CN107574836A (en
Inventor
胡亚琴
张国伟
周月军
沈建明
唐绍明
吴淼
许赵江
陈成
魏小军
魏治科
张平
杨雨春
杨培亮
顾雪飞
程滨生
陈小亮
章铭荣
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Hami Kangjian Engineering Construction Co ltd
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Hami Kangjian Engineering Construction Co ltd
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Abstract

The invention discloses a construction structure crossing an urban road underground passage, which comprises a first construction structure (110) and a second construction structure (120); the first construction structure (110) comprises guard piles (1) and waterproof curtains (2), a first crown beam (3) is arranged at the top of the guard piles (100) at two sides, a thick reinforced concrete cover plate (4) is arranged between the first crown beams (3) at two sides, and a supporting device is arranged between the guard piles (1) at two sides; the second construction structure is the same as the first construction structure except that a reinforced concrete support is arranged between crown beams at the top, and plain concrete cushion layers (9) are arranged below the first construction mechanism (110) and the second construction structure (120) in the underground passage (100). The invention also discloses a construction method for crossing the urban road underground passage. The construction structure and the construction method for crossing the urban road underground passage disclosed by the invention have the advantages of short road sealing time during construction, high construction efficiency and stable structure.

Description

Construction structure and construction method for crossing urban road underground passage
Technical Field
The invention relates to the field of underground passage construction, in particular to a construction structure and a construction method for crossing an urban road underground passage.
Background
The construction methods commonly adopted in the construction of underground passages or subway tunnels at present comprise a large excavation construction method and a shield mechanical tunneling jacking pipe construction method.
The traditional method is a large excavation construction mode, namely, firstly, a construction road surface is sealed, a guard pile is constructed, then an earth is excavated by a construction support, then a lower layer earth is excavated by a construction lower support, the circulation is performed, the construction is performed layer by layer from top to bottom until the construction is performed to the bottom of a foundation pit, then an underground passage structure is constructed, then soil is backfilled, and then road engineering is constructed.
In the shield mechanical tunneling jacking pipe construction method, firstly, a tunnel is dug through the shield mechanical, then a supporting frame is pushed to prop up a channel for supporting along the mechanical tunneling direction, the subsequent concrete frame in the mode needs to be prefabricated by a prefabrication factory, then transported to the site through transportation equipment, installed by large hoisting equipment and influenced by the hoisting equipment, such as in urban subway and underground channel construction: the circular component can be prefabricated and installed in a segmented mode, the special-shaped and rectangular frame structure is required to be prefabricated into a whole, after the circular component is installed on the shield, the reaction force generated during tunneling is transmitted to the back of the final departure well along with the component when the shield machine is tunneled forward, and then the frame component is pushed forward along with the shield by the back jack.
In the shield mechanical tunneling jacking pipe construction method, the sealing construction treatment can be omitted, normal traffic is not affected, but the method also has the following problems that the method can be used for construction when the structural size is smaller and the jacking distance is shorter, the lifting equipment and the jacking equipment can not meet the construction requirement after the tunneling distance is lengthened along with the increase of the structural size.
With the development of urban traffic and the increase of personnel flow, the requirement of people on travel cannot be met by structures with small structure size, and the requirement of building underground passages and structures with large structure size is increasing, so a new underground passage construction structure and a new construction method are needed.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the construction structure which traverses the urban road underground passage has the advantages of short road sealing time, high construction efficiency and stable construction structure during construction.
The technical scheme adopted by the invention is as follows: providing a construction structure crossing an urban road underground passage, comprising a first construction structure positioned at a trunk road part and a second construction structure positioned at a peripheral road part;
the first construction structure comprises guard piles which are vertically arranged close to two side surfaces of the underground passage, a waterproof curtain is arranged on one side, far away from the underground passage, of each guard pile, first crown beams are arranged on the tops of the guard piles on two sides, thick reinforced concrete cover plates are arranged between the first crown beams on two sides, and supporting devices are arranged between the inner side walls of the guard piles on two sides of the underground passage;
the second construction structure comprises guard piles which are vertically arranged close to two side surfaces of the underground passage, a waterproof curtain is arranged on one side, far away from the underground passage, of each guard pile, second crown beams are arranged on the tops of the guard piles on two sides, reinforced concrete supports are arranged between the second crown beams on two sides, and supporting devices are arranged between the inner side walls of the guard piles on two sides of the underground passage;
and plain concrete cushion layers are arranged below the first construction mechanism and the second construction mechanism of the underground passage.
Further, strutting arrangement include shaped steel and enclose purlin and steel pipe support, shaped steel enclose the purlin setting on the fender post inside wall of both sides, the both ends that the steel pipe supported enclose the purlin with the shaped steel of both sides respectively and be connected.
Preferably, the section steel surrounding purlin is of a double-spliced structure. The double-spliced structure is more stable and firm, and the construction process is safer.
As an improvement, a support column and a reinforced concrete main body are arranged below the underground passage, and the plain concrete cushion layer is positioned between the lower bottom surface of the underground passage and the reinforced concrete main body.
On the other hand, the technical problems to be solved by the invention are as follows: the construction method for crossing the urban road underground passage has the advantages of short road sealing time, high construction efficiency and stable construction structure during construction.
The technical scheme adopted is as follows: the construction method for crossing the urban road underground passage is characterized by comprising the following steps:
a. constructing guard piles on two sides close to an underground passage along the length direction in a construction pavement guard operation site, wherein the construction pavement guard operation site comprises a trunk road part and a peripheral road part;
b. in order to prevent earthwork collapse caused by water outlet on the side wall when a channel is excavated, constructing a high-pressure jet grouting pile waterproof curtain on one side of the guard pile close to the wall;
c. excavating a main road matrix to a preset position, and constructing a first crown beam at the top of the fender pile;
d. constructing a thick reinforced concrete cover plate on the first crown beam while constructing the first crown beam, backfilling the road surface after the first crown beam and the thick reinforced concrete cover plate meet the design strength requirement, and recovering the trunk road traffic;
e. excavating a part of the matrix of the peripheral road to a preset position, constructing a second crown beam at the top of the fender pile, and simultaneously constructing reinforced concrete supports between the second crown beams at two sides;
f. a deep pumping well is arranged at a position close to a foundation pit where the underground passage is constructed, pre-dewatering is carried out in the pit, and the dewatering depth is less than 1m below the pit bottom;
g. after the second crown beam and the reinforced concrete support reach the design strength, excavating earthwork in a layered and sectional mode,
firstly, excavating a peripheral road part to a preset position along the vertical direction, then, applying profile steel purlins on two side walls, erecting steel pipe supports between the profile steel purlins on two sides, applying prestress to the steel pipe supports, and continuing to excavate to the bottom of a foundation pit;
h. then, layering and sectionally excavating the foundation pit which is excavated by the peripheral road to the lower part of the cover plate along the horizontal direction, after excavating to a preset position, applying profile steel enclosing purlins on the two side walls, erecting steel pipe supports between the profile steel enclosing purlins on the two sides, applying prestress to the steel pipe supports, and continuing excavating to the bottom of the foundation pit;
i. after the trunk road part and the peripheral road part are excavated to the bottom of the foundation pit, pouring a plain concrete cushion layer at the bottom of the foundation pit;
j. after the cushion layer is constructed, constructing a bottom plate of the channel;
k. after the bottom plate reaches the design strength, dismantling the profile steel purlin and the steel pipe support on the side wall, and pouring the side wall and the top plate of the channel;
after the steps are finished, backfilling between the cover plate and the top plate at the trunk road part, and grouting and packing compactly;
m, backfilling partial earthwork of the peripheral road to the positions of the reinforced concrete support and the second crown beam;
n, dismantling the reinforced concrete support and the second crown beam;
and o, constructing a part of road surface of the peripheral road, and recovering the traffic of the peripheral road after finishing.
Further, the step e of excavating the substrate of the peripheral road to the preset position means excavating the peripheral road from any side of the trunk road or excavating the peripheral roads from both sides of the trunk road simultaneously.
Preferably, the section steel surrounding purlin in the step g or the step h is of a double-spliced structure.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the construction method, after the guard piles and the waterproof curtains are constructed, a trunk road part is excavated, a first crown beam is constructed to a preset depth, and meanwhile, a cover plate is constructed on the first crown beam, road surface backfilling is carried out after the cover plate and the first crown beam are completed, and trunk road traffic is recovered, so that the cover plate is constructed firstly, road traffic can be recovered after the cover plate is completed, and then the following part of the cover plate is excavated, so that the influence on traffic is reduced to the greatest extent; the peripheral road part is excavated under the condition that the traffic of the trunk road is not influenced, the construction of the peripheral road part adopts an open excavation construction method from top to bottom, supports are immediately applied after excavation is carried out for a certain depth, collapse of two sides of a foundation pit is prevented, multiple layers of supports can be selectively arranged according to the depth of the foundation pit, the supports are uniformly arranged in the foundation pit at intervals along the length direction, the wall body strength of two sides of the foundation pit is ensured to the greatest extent, and because the peripheral road part is the peripheral road, the road sealing construction has little influence on traffic, after excavation of the peripheral road part is completed, the lower part of the trunk road is excavated in a layered and segmented mode from the foundation pit of the excavated peripheral road section, earthwork comes out from the foundation pit of the peripheral road section, and pouring of a bottom plate, a side plate and a top plate of a channel is completed after excavation of all the foundation pit is completed;
after the channel parts are poured and meet the design strength requirement, backfilling is firstly performed between the cover plate of the trunk road part and the top plate of the channel, and a grouting filling mode is adopted, so that the cover plate and the top plate of the channel are firmly poured together, and guard piles are arranged on two sides of the cover plate to serve as supports, so that the strength of a roadbed of the trunk road can be effectively ensured, collapse accidents caused by underground excavation of a channel II can be avoided, backfilling of the peripheral road part is performed after the construction of the trunk road part is completed, and finally, the peripheral road part road surface is made, so that peripheral traffic is restored.
The construction method has high construction efficiency and small influence on traffic, and the construction method has short channel sealing time (only needs to seal channels when the fender piles and the cover plates are constructed) by constructing the cover plates and then carrying out supporting and soil digging construction under the cover plates, so that the influence on the traveling of citizens is small, and the integral structural strength is high after the channels are completed.
Drawings
Fig. 1 is a schematic view of a road top view of a construction structure and a construction method of the present invention crossing an underground passage of an urban road.
Fig. 2 is a sectional view of the main road portion E-E of fig. 1.
FIG. 3 is a schematic cross-sectional view of the peripheral road portion F-F of FIG. 1
Wherein 100, underground passage, 101, bottom plate, 102, side wall, 103, top plate, 1, guard post, 2, waterproof curtain, 3, first crown beam, 4, thick reinforced concrete cover plate, 5, second crown beam, 6, reinforced concrete support, 7, shaped steel purlin, 8, steel pipe support, 9, plain concrete cushion layer, 10, support column, 11, reinforced concrete main body
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 to 3, the construction structure for crossing an underground passage of an urban road provided by the present invention includes a first construction structure 110 located at a trunk road portion and a second construction structure 120 located at a peripheral road portion;
the first construction structure 110 comprises guard piles 1 which are vertically arranged close to two side surfaces of the underground passage 100, wherein a waterproof curtain 2 is arranged on one side, far away from the underground passage 100, of each guard pile 1 on two sides, first crown beams 3 are arranged at the tops of the guard piles 100 on two sides, thick reinforced concrete cover plates 4 are arranged between the first crown beams 3 on two sides, supporting devices are further arranged between the inner side walls of the guard piles 1 on two sides of the underground passage 100, and the guard piles are used for supporting walls on two sides of a foundation pit of the underground passage and preventing collapse during construction;
the second construction structure 120 comprises guard piles 1 which are vertically arranged close to two side surfaces of the underground passage 10, a waterproof curtain 2 is arranged on one side, far away from the underground passage 100, of each guard pile 1, second crown beams 5 are arranged on the tops of the guard piles 1 on two sides, reinforced concrete supports 6 are arranged between the second crown beams 5 on two sides, and supporting devices are arranged between the inner side walls of the guard piles 1 on two sides of the underground passage 100;
the underground passage 100 is positioned below the first construction mechanism 110 and the second construction mechanism 120, and plain concrete cushion layers 9 are arranged below the underground passage.
The supporting device comprises a section steel enclosing purlin 7 and a steel pipe supporting purlin 8, wherein the section steel enclosing purlin 7 is arranged on the inner side wall of the fender post 1 on two sides, two ends of the steel pipe supporting purlin 8 are respectively connected with the section steel enclosing purlin 7 on two sides, and the section steel enclosing purlin 7 adopts a double-spliced structure as a preferential mode.
The underground passage 100 is characterized in that a support column 10 and a reinforced concrete main body 11 are further arranged below the underground passage 100, and the plain concrete cushion 9 is positioned between the lower bottom surface of the underground passage 100 and the reinforced concrete main body 11.
On the other hand, the invention also provides a construction method for crossing the urban road underground passage, which comprises the following steps:
a. arranging fences on the pavement of the underground passage 100 to be constructed, enclosing a working place comprising a trunk road part and a peripheral road part, and then constructing fender piles 1 on two sides of the position close to the underground passage 100 along the length direction of the passage according to the designed position, wherein the fender piles 1 are uniformly arranged at intervals along the length direction of the underground passage 100;
b. in order to prevent earthwork collapse caused by water outlet on two side surfaces when a channel is excavated, constructing a high-pressure jet grouting pile waterproof curtain 2 on one side of the fender pile 1 close to a wall body;
c. firstly, excavating a main road matrix, and constructing a first crown beam 3 along the length direction of a channel at the tops of fender piles 1 at two sides of the channel of the road section after earthwork is excavated to a preset depth position;
d. constructing a thick reinforced concrete cover plate 4 on the first crown beam 3 while constructing the first crown beam 3, respectively erecting and fixing two ends of the thick reinforced concrete cover plate 4 on the first crown beams 3 on two sides, backfilling the road surface after the first crown beam 3 and the thick reinforced concrete cover plate 4 meet the design strength requirement, and recovering trunk road traffic;
e. then excavating a peripheral road part matrix, constructing a second crown beam 5 on the tops of the fender piles 1 on two sides of a road section channel along the length direction of the channel after earthwork is excavated to a preset depth position, and constructing reinforced concrete supports 6 between the second crown beams 5 on two sides at the same time, wherein in the step, the peripheral road part on any side of a trunk road can be excavated, and the peripheral roads on two sides of the trunk road can be excavated towards the trunk road part at the same time, so that the construction time is shortened, and the construction efficiency is improved;
f. in order to prevent groundwater from influencing construction, a deep pumping well is arranged at a position close to a foundation pit for constructing an underground passage, and pre-dewatering is carried out in the pit, wherein the dewatering depth is less than 1m below the pit bottom;
g. after the second crown beam 5 and the reinforced concrete support 6 reach the design strength, excavating earthwork in a layered and segmented mode, firstly excavating partial earthwork of a peripheral road downwards along the vertical direction, after excavating to a preset depth position, applying profile steel enclosing purlins 7 on two sides of a foundation pit, respectively fixing the profile steel enclosing purlins 7 on the inner walls of the enclosing piles 1, erecting steel pipe supports 8 between the profile steel enclosing purlins 7 on two sides, applying prestress to the steel pipe supports 8 according to the actual construction foundation hardness, wherein the steel pipe supports 8 are used for supporting the enclosing piles 1 on two sides to prevent collapse, the steel pipe supports 8 are uniformly arranged at intervals along the length direction of a channel, and after the steel pipe supports 8 are erected, excavating is continued to the bottom of the foundation pit, and preferably, the profile steel enclosing purlins 7 erected in the step are of a double-spliced structure;
h. then, excavating a foundation pit from the position of an excavated foundation pit of a peripheral road section along the lower part of a thick reinforced concrete cover plate 4 in a layered and segmented mode along the horizontal direction, after excavating to a preset position as in the step g, constructing profile steel enclosing purlins 7 on the enclosing piles 1 on two sides, erecting steel pipe supports 8 between the profile steel enclosing purlins 7 on two sides, applying prestress to the steel pipe supports 8 according to the actual construction foundation hardness, uniformly arranging the steel pipe supports 8 at intervals along the length direction of a channel, and then continuously excavating to the bottom of the foundation pit, wherein the profile steel enclosing purlins 7 erected in the step are of a double-spliced structure;
i. after the trunk road part and the peripheral road part are excavated to the bottom of the foundation pit, pouring a plain concrete cushion layer 9 at the bottom of the foundation pit, in the embodiment of the invention, as the soil quality at the bottom of the foundation pit is loose or softer, the support columns 10 are applied to the two sides of the bottom of the foundation pit near the guard piles 1, then the reinforced concrete main bodies 11 are applied to the support columns 10 at the two sides, and finally the plain concrete cushion layer 9 is poured above the main body structures 11;
j. after the construction of the plain concrete cushion layer 9 at the bottom of the foundation pit of the trunk road and the peripheral road is completed, constructing the bottom plate 101 of the underground passage 10;
k. after the bottom plate 101 reaches the design strength, sectional steel purlins 7 and steel pipe supports 8 on the side walls are removed in a sectional mode along the length direction of the channel, then the side walls 102 and top plates 103 of the underground channel 100 are poured, and after one end of the sectional steel purlins 7 and the steel pipe supports 8 are removed, the corresponding side walls 102 and top plates 103 of the underground channel 100 are immediately poured, and the removal is repeated, and the construction is completed until pouring of all the side walls 102 and the top plates 103 of the whole underground channel 100 is completed;
l, after the steps are finished, backfilling is carried out between the thick reinforced concrete cover plate 4 and the top plate 103 at the trunk road part, grouting and compaction are needed, so that the thick reinforced concrete cover plate 4 and the top plate 103 are firmly poured together, and the overall structural strength is improved;
m, after the trunk road part is completed, backfilling the earthwork of the peripheral road part, and after the earthwork is backfilled to the positions of the reinforced concrete support 6 and the second crown beam 5, dismantling the reinforced concrete support 6 and the second crown beam 5;
and o, finally, constructing partial road surfaces of the peripheral roads, and recovering all the peripheral road traffic after finishing.
The foregoing description of the preferred embodiments of the present invention is provided for illustration and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to be changed, and all changes made within the scope of the invention as independently claimed are within the scope of the invention.

Claims (3)

1. A construction method for crossing an urban road underground passage, the construction structure of which comprises a first construction structure (110) located at a trunk road portion and a second construction structure (120) located at a peripheral road portion;
the first construction structure (110) comprises guard piles (1) which are vertically arranged close to two side surfaces of the underground passage (100), a waterproof curtain (2) is arranged on one side, far away from the underground passage (100), of each guard pile (1), first crown beams (3) are arranged on the tops of the guard piles (1) on two sides, thick reinforced concrete cover plates (4) are arranged between the first crown beams (3) on two sides, and supporting devices are arranged between the inner side walls of the guard piles (1) on two sides of the underground passage (100);
the second construction structure (120) comprises guard piles (1) which are vertically arranged close to two side surfaces of the underground passage (100), a waterproof curtain (2) is arranged on one side, far away from the underground passage (100), of each guard pile (1), second crown beams (5) are arranged on the tops of the guard piles (1) on two sides, reinforced concrete supports (6) are arranged between the second crown beams (5) on two sides, and supporting devices are arranged between the inner side walls of the guard piles (1) on two sides of the underground passage (100); the supporting device comprises a section steel enclosing purlin (7) and a steel pipe support (8), wherein the section steel enclosing purlin (7) is arranged on the inner side wall of the enclosure pile (1) at two sides, and two ends of the steel pipe support (8) are respectively connected with the section steel enclosing purlins (7) at two sides;
the underground passage (100) is positioned below the first construction structure (110) and the second construction structure (120), and plain concrete cushion layers (9) are arranged below the first construction structure and the second construction structure; the construction method of the underground passage (100) is characterized by comprising the following steps of:
a. constructing guard piles (1) on two sides close to an underground passage (100) along the length direction in a construction pavement guard operation site comprising a trunk road part and a peripheral road part;
b. in order to prevent collapse caused by water outlet on the side walls of two sides when a channel is excavated, constructing a high-pressure jet grouting pile waterproof curtain (2) on one side of the guard pile (1) close to a wall body;
c. excavating a main road matrix to a preset position, and constructing a first crown beam (3) at the top of the fender post (1);
d. constructing a thick reinforced concrete cover plate (4) on the first crown beam (3) while constructing the first crown beam (3), and backfilling the road surface after the first crown beam (3) and the thick reinforced concrete cover plate (4) meet the design strength requirement, so as to recover the trunk road traffic;
e. excavating a part of the matrix of the peripheral road to a preset position, constructing a second crown beam (5) on the top of the guard pile (1), and simultaneously constructing reinforced concrete supports (6) between the second crown beams (5) on two sides;
f. a deep pumping well is arranged at a position close to a foundation pit where the underground passage (100) is constructed, pre-dewatering is carried out in the pit, and the dewatering depth is less than 1m below the pit bottom;
g. after the second crown beam (5) and the reinforced concrete support (6) reach the design strength, excavating earthwork in a layered and sectional mode,
firstly, excavating a peripheral road part downwards in the vertical direction to a preset position, then applying profile steel enclosing purlins (7) on two side walls, erecting steel pipe supports (8) between the profile steel enclosing purlins (7) on two sides, applying prestress to the steel pipe supports (8), and continuing excavating to the bottom of a foundation pit;
h. then, excavating the foundation pit which is excavated by the peripheral road and is completed in a layered and sectional mode along the horizontal direction below the thick reinforced concrete cover plate (4), after excavating to a preset position, applying steel enclosing purlins (7) on the two side walls, erecting steel pipe supports (8) between the two side steel enclosing purlins, applying prestress to the steel pipe supports (8), and continuing excavating to the foundation pit bottom;
i. after the trunk road part and the peripheral road part are excavated to the bottom of the foundation pit, pouring a plain concrete cushion layer (9) at the bottom of the foundation pit;
j. after the cushion layer is constructed, constructing a bottom plate (101) of the underground passage (100);
k. after the bottom plate (101) reaches the design strength, dismantling the profile steel purlin (7) and the steel pipe support (8) on the side wall, and pouring the side wall (102) and the top plate (103) of the underground passage (100);
after the steps are finished, backfilling is carried out between the thick reinforced concrete cover plate (4) and the top plate (103) at the trunk road part, and grouting filling is compact;
m, backfilling the earth of the peripheral road part, and dismantling the reinforced concrete support (6) and the second crown beam (5) after backfilling to the positions of the reinforced concrete support (6) and the second crown beam (5);
and n, constructing a part of road surface of the peripheral road, and recovering the traffic of the peripheral road after finishing.
2. The construction method for crossing an urban road subterranean passageway according to claim 1, wherein: the section steel enclosing purlin (7) is of a double-spliced structure.
3. The construction method for crossing an urban road subterranean passageway according to claim 1, wherein: and e, excavating the peripheral road part matrix to a preset position, wherein the excavation of the peripheral road part matrix from any side of the trunk road or the simultaneous excavation of the peripheral roads from both sides of the trunk road is performed.
CN201710723576.4A 2017-08-22 2017-08-22 Construction structure and construction method for crossing urban road underground passage Active CN107574836B (en)

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