CN103866701A

CN103866701A - Construction method for reserved laterally widened structure of underground box culvert structure

Info

Publication number: CN103866701A
Application number: CN201210542246.2A
Authority: CN
Inventors: 薛勇; 温竹茵
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2012-12-14
Filing date: 2012-12-14
Publication date: 2014-06-18
Anticipated expiration: 2032-12-14
Also published as: CN103866701B

Abstract

The invention discloses a construction method for a reserved laterally widened structure of an underground box culvert structure. The method comprises the following steps: carrying out the future expansion on the side walls for the box culvert structure in advance, additionally arranging reinforced concrete pilasters to be used as vertical components for bearing horizontal water and earth pressure during foundation pits excavation in expansion; using top plates, middle plates and bottom plates to support the side walls of expansion sides, and arranging steel bar connectors in the plates. In later expansion, as the pilasters can be used as load-bearing components for lateral support of foundation pits, construction risk, construction difficulty and influence on the normal operation of an already built tunnel are greatly reduced, the construction is simpler and more convenient, and the construction period is shortened.

Description

The Structural Tectonics method of the reserved lateral widening of a kind of Underground Culvert structure

Technical field

The present invention relates to the construction applications of the underground chamber that adopts the construction of Underground Culvert pattern, be particularly related to and adopt the underground chamber (comprising the tunnel such as road, subway) that Underground Culvert pattern is built to require lateral widening that a kind of reserved Structural Tectonics pattern, specifically the Structural Tectonics method of the reserved lateral widening of a kind of Underground Culvert structure are provided for meeting demand at a specified future date.

Background technology

Underground Culvert structure is carried out lateral widening construction often following problem:

1. construction risk is larger, show as and cut the box culvert structure top/bottom part the reinforcement of concrete that put into effect in advance to be connected with the reinforcing bar that the later stage is widened box culvert structure, because box culvert bight hogging moment is larger, cut original box culvert bight concrete and will slacken box culvert structure integrated carrying ability;

2. be consideration 1, can be runing the interim reinforcing of do in box culvert, so by longer the time that affects normally operation;

Due to the box culvert side wall of implementing be in advance difficult to bear construction in later period foundation ditch to support axle power, often difficulty comparatively of the adjustment that now needs to consider Support Position, increases difficulty of construction, duration and construction risk.

Summary of the invention

The object of the present invention is to provide the Structural Tectonics method of the reserved lateral widening of the more simple and convenient Underground Culvert structure of a kind of construction.

To achieve these goals, technical scheme of the present invention is: the Structural Tectonics method of the reserved lateral widening of a kind of Underground Culvert structure, is characterized in that: the method comprises the following steps:

The Underground Culvert structure that A, construction are implemented in advance widen side side wall, the top of its box culvert, in, base plate chooses box culvert side wall and extends to space enclosing structure, and after reserved, build the required top of box culvert, in, baseplate reinforcing bar connector;

B, widen between side structure and space enclosing structure and along box culvert, vertical pilaster is vertically set every a segment distance at box culvert, be convenient to the support arrangement when later stage, excavation was implemented in structure enlarging;

C, the space of widening side box culvert space enclosing structure and its box culvert side wall, side wall pilaster adopt packing material to tamp;

D, later stage are widened enlarging box culvert after space enclosing structure completes, and in foundation ditch, support successively from top to bottom and set up with soil excavation to cheating the end;

E, then successively from the end,, top board dig out successively each laminate connector connect, assembling reinforcement, build each laminate and side wall concrete, return build to top board;

F, dismounting are supported and are recovered ground at top plate earth-covering, and then side wall, vertical pilaster and packing material in the middle of cutting disassembling, complete the concrete structure engineering of extending box culvert.

According to a preferred embodiment of the invention, the packing material in step C adopts air-entrained concrete building block.Support in step D should be erected at vertical pilaster position.

Technical scheme feature of the present invention is: when extending side wall the long term of implementing in advance box culvert structure and adding steel concrete pilaster as enlarging, excavation of foundation pit bears the vertical member of level to Water And Earth Pressures, top, in, base plate chooses enlarging side side wall reinforcing bar connector is set in plate, in when enlarging in later stage, is due to the bearing carrier that can utilize pilaster as foundation ditch cross binding, greatly reduce construction risk and difficulty and the impact on the normal operation of established tunnel, make construction more simple and convenient, save the duration.

Accompanying drawing explanation

Fig. 1 is the structural representation of first building Underground Culvert.

Fig. 2 is the partial schematic diagram of Fig. 1, the partial enlarged drawing that Fig. 2 a is A, the partial enlarged drawing that Fig. 2 b is B, the partial enlarged drawing that Fig. 2 c is C.

Fig. 3 builds the plan view of Underground Culvert after being.

Fig. 4 builds the sectional drawing of Underground Culvert after being.

Fig. 5 has been the structural representation of rear overall box culvert.

The specific embodiment

Below in conjunction with drawings and Examples, the present invention will be further described.

Below in conjunction with accompanying drawing, this method is further described, its methods && steps of implementation is as follows:

The Underground Culvert structure that A, construction are implemented is in advance widened side side wall, widen side at need, to be reinforcing bar be not connected as diaphragm wall reinforcing bar with space enclosing structure for space enclosing structure 2 and inner box culvert structure separation, the top board of box culvert 10, middle plate 11, base plate 12 are chosen to box culvert side wall 3 and extended to and first build space enclosing structure 2, and after reserved, build the required connection of box culvert top, in, baseplate reinforcing bar connector 8(is shown in Fig. 1 and Fig. 2), side wall and the spacing of first building between space enclosing structure 2 are generally 20 ~ 30cm;

B, between box culvert structure and space enclosing structure 2 every a segment distance (according to a particular embodiment of the invention, this distance is preferably 2.5 ~ 3.5m) along box culvert, vertical pilaster 4(is vertically set and sees Fig. 3, material can adopt steel concrete or other), the horizontal support power transmission of being convenient to when the later stage, excavation of foundation pit was implemented in structure enlarging loads, the width and thickness of vertical pilaster meets structural bearing requirement, generally be not less than 80cm, thickness is according to foundation depth and support arrangement, by calculative determination, the computational process is here those skilled in the art's known technology, do not repeat them here,

C, between space enclosing structure 2 and its box culvert side wall pilaster 4 of implementing in advance and side wall 3, adopt and tamp (see figure 3) as the packing materials such as air-entrained concrete building block 5;

D, later stage are built space enclosing structure 6 after widening enlarging enforcement, then in foundation ditch, support successively from top to bottom and 7 set up (support avoid top, in, base plate, but should support in vertical pilaster 4 positions) and soil excavation to cheating at the end (seeing Fig. 3 and Fig. 4), in this step, also should remove more than excavation of foundation pit face the space enclosing structure 2 of part, after build the Excavation Process of box culvert in remove while digging;

E, then successively from the end,, top board (from bottom to up) connector of digging out successively each laminate in order to connecting, assembling reinforcement, build each laminate and side wall concrete until top board (seeing Fig. 3 and Fig. 4);

F, remove to support also and recover ground at top plate earth-covering, then can cutting disassembling side wall 3, vertical pilaster 4 and packing material 5(be shown in part shown in dotted line in Fig. 5), complete the concrete structure engineering of enlarging box culvert.

Claims

1. the Structural Tectonics method of the reserved lateral widening of Underground Culvert structure, it is characterized in that: the method comprises the following steps: the Underground Culvert structure that A, construction are implemented in advance widen side side wall, the top of its box culvert, in, base plate chooses box culvert side wall and extends to space enclosing structure, and after reserved, build the required top of box culvert, in, baseplate reinforcing bar connector; B, widen between side structure and space enclosing structure and along box culvert, vertical pilaster is vertically set every a segment distance at box culvert, be convenient to the support arrangement when later stage, excavation was implemented in structure enlarging; C, the space of widening side box culvert space enclosing structure and its box culvert side wall, side wall pilaster adopt packing material to tamp; D, later stage are widened enlarging box culvert after space enclosing structure completes, and in foundation ditch, support successively from top to bottom and set up with soil excavation to cheating the end; E, then successively from the end,, top board dig out successively each laminate connector connect, assembling reinforcement, build each laminate and side wall concrete, return build to top board; F, dismounting are supported and are recovered ground at top plate earth-covering, and then side wall, vertical pilaster and packing material in the middle of cutting disassembling, complete the concrete structure engineering of extending box culvert.

2. method according to claim 1, is characterised in that: the packing material in step C adopts air-entrained concrete building block.

3. method according to claim 1, is characterised in that: the support in step D should be erected at vertical pilaster position.