CN111877407A

CN111877407A - Construction method for reserved interface of underground space connecting channel

Info

Publication number: CN111877407A
Application number: CN202010732157.9A
Authority: CN
Inventors: 胡志强; 孙浩林; 唐达昆; 夏明锬; 粱水斌; 刘永林; 陈明
Original assignee: China Railway 11th Bureau Group Co Ltd; First Engineering Co Ltd of China Railway 11th Bureau Group Co Ltd
Current assignee: China Railway 11th Bureau Group Co Ltd; First Engineering Co Ltd of China Railway 11th Bureau Group Co Ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-11-03

Abstract

The invention relates to a construction method of a reserved interface of an underground space connecting channel, which is characterized in that a trapezoidal plugging block formed by welding common section steel and a panel is installed and fixed on a prior supporting pile; after foundation excavation is finished, pouring a front underground passage bottom plate and front underground passage left and right side retaining walls; pouring the trapezoidal plugging block with the surface adhered with the rubber waterstop on the concrete side wall; when the underground passage at the later stage of excavation reaches the supporting pile, the supporting pile is broken, and the trapezoidal plugging blocks pre-buried in the underground passage are exposed; installing left and right side retaining wall templates and a top template in the excavated later-stage underground passage, and pouring concrete to form left and right side retaining walls of the later-stage underground passage; starting a temporary jack installed in the front-stage underground passage, and ejecting the pre-embedded trapezoidal plugging block out of the concrete front-stage side wall to enable the front-stage underground passage and the rear-stage underground passage to be communicated; chiseling residual walls around the concrete early-stage side wall interface, and trowelling the residual walls with cement to form a flat and smooth surface; and finally, pouring a concrete bottom plate in the later-stage underground passage.

Description

Construction method for reserved interface of underground space connecting channel

Technical Field

The invention belongs to the technical field of underground structural engineering construction, and particularly relates to a construction method of a reserved interface of an underground space connecting channel.

Background

Along with the gradual rise of underground space structure, in city underground space construction, because of receiving construction condition restriction, consider long-term planning and development, have to reserve a plurality of UNICOM interface of plugging into in underground space subject structure, make things convenient for the intercommunication in later stage underground space.

In the prior art, the interface is reserved for the underground space connecting channel, most of the interfaces are not reserved, when long-term construction is carried out, structural reinforced concrete is directly broken at the interface position, and a supporting and waterproof structure is reset. The invention patent application of patent publication No. CN107558501A discloses (a construction method of reserved opening structure of underground passage without post excavation), which is to arrange a ground side corbel on the underground continuous wall, arrange a water stop glue on the connection end surface of the ground side corbel and the channel side corbel to be constructed later, and arrange the side corbel and the water stop glue structure on the end part of the underground passage to form a closed temporary soil retaining and water stopping structure. When the channel is connected with the land, the underground continuous wall can be directly chiseled out of the structure and the structure construction of the connecting section is completed; the permanent waterproof side of the underground passage deformation joint is jointly realized by a buried water stop. By adopting the construction measures, the condition of foundation pit excavation in a narrow space is avoided, temporary retaining wall structures in retaining walls on the upper portion of a roof structure and a channel are omitted, and construction of the tunnel enclosure structure to the connecting section is not required to be reserved. The construction of the reserved joint structure of the later-excavated underground passage plays a certain positive role. However, the method still has the defects that when the underground continuous wall is chiseled in a narrow space of the underground passage, the construction difficulty is high, the progress is slow, and a large amount of manpower and material resources are consumed; and simultaneously, the quality of the underground passage is influenced by chiseling off the underground continuous wall. Therefore, a new construction method for reserving the interface of the underground passage is needed to be adopted, so that the underground early passage and the underground later passage can be quickly and conveniently connected and communicated, the progress of pouring the concrete passage in the early and later periods is accelerated, the quality of the underground passage can be ensured, and the service life is prolonged.

Disclosure of Invention

The invention aims to provide a construction method of reserved interfaces of underground passages, aiming at the defects of the prior art, the method can easily, quickly and conveniently remove the trapezoidal blocks in the reserved interfaces in the reinforced concrete wall body of the underground space, so that the concrete passages poured in the early stage and the later stage are quickly connected and communicated; the process of pouring the concrete channel in the front and the later stages is accelerated, the quality of the underground channel can be guaranteed, and the construction cost is saved.

The technical scheme of the invention is as follows: a construction method for reserved interfaces of underground space connecting channels is characterized by comprising the following steps: the construction method comprises the following steps:

the first step is as follows: welding a framework 1 by using common section steel, and welding a panel 2 on the surface of the framework 1 to form a trapezoidal block 9; the included angle between the inclined edge c and the straight edge b of the trapezoidal plugging block is set to be 15-75 degrees;

step two: firstly, driving an early-stage supporting pile, and pouring concrete into a supporting pile hole to form a supporting pile 6; after excavating the early-stage underground passage foundation, pouring a concrete bottom plate 3 of the early-stage underground passage; drilling anchoring steel bars 7 on the early-stage concrete support piles 6;

step three: installing front-stage underground passage left and right concrete retaining wall templates and top templates, and pouring concrete retaining walls (12, 12') in the left and right concrete retaining wall templates; then respectively welding the anchoring steel bars 7 at one end of the trapezoidal plugging block 9; the other end of the trapezoidal block 9 is contacted with the side wall template 8 together, so that the trapezoidal block 9 is positioned at a reserved interface position of the side wall between the early-stage concrete support pile 6 and the side wall template;

step four: after the trapezoidal block 9 is installed in place, a rubber water stop belt 11 is adhered to the surface of the trapezoidal block 9;

step five: binding vertical steel bars 15 and transverse steel bars 17 between the side wall template 8 and the early-stage concrete support piles 6 respectively, and pouring concrete in the space 10 between the side wall template 8 and the support piles 4 to form early-stage concrete side walls (transverse walls) 16;

step six: installing an underground space early-stage connecting channel top template, and pouring concrete in the top template to form an early-stage connecting channel concrete top plate 5;

step seven: after the reserved later underground passage is excavated to the position of the reserved interface of the underground passage and soil reaches the early-stage supporting pile 6, the concrete supporting pile between the early-stage concrete supporting pile 6 and the early-stage concrete supporting pile 6' in the reserved later-stage underground passage is broken, and the concrete side wall (transverse wall) 16 and the pre-buried trapezoidal block 9 (reserved connection interface) in the early-stage underground passage are exposed; then, installing retaining wall templates and top templates at the front side and the rear side of the later underground passage 4', and pouring concrete in the templates to form a left concrete retaining wall, a right concrete retaining wall (18, 18') and a top plate 13 of the later concrete passage of the later underground passage;

step eight: a temporary supporting seat is arranged in the early underground space, and a backing plate is additionally arranged at the left end of the trapezoidal block 9; the tail end of the jack is propped against the temporary supporting seat, and a piston rod of the jack is propped against a base plate at the left end of the trapezoidal plugging block 9; the jack is started to apply pressure to the backing plate, the pre-buried trapezoidal blocks 9 are ejected (separated) out of the concrete early-stage side wall 16 under the action of the jack, and after the trapezoidal blocks 9 are separated from a reserved connecting port on the concrete early-stage side wall 16, the early-stage underground channel 4 is communicated with the excavated (later-stage) underground channel 4';

step nine: removing a temporary supporting seat, an additionally arranged base plate and a side wall template (8) in the early underground space;

step ten: chiseling (removing) residual walls around the joints of the concrete early side wall 16, and trowelling the residual walls with cement to form a flat and smooth surface; finally, a concrete bottom plate 14 is poured in the later underground passage 4'.

The invention has the beneficial effects that: the method can easily, quickly and conveniently integrally remove the trapezoidal blocks in the reserved joints of the reinforced concrete wall body of the underground space, so that the concrete channels poured in the early stage and the later stage are quickly connected and communicated; the construction progress of the concrete channel poured in the front and the later stages is accelerated, the manpower and the construction cost are saved, and the quality of the underground channel can be ensured.

Drawings

The present invention will be described in detail with reference to the accompanying drawings and examples.

FIG. 1 is a schematic diagram of the structure of underground passages in the front and rear stages of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1 (front and rear concrete walls of the front underpass);

FIG. 3 is a schematic view of a trapezoidal block structure;

FIG. 4 is a schematic representation of the underpass before and after concrete placement;

FIG. 5 is a sectional view taken along line B-B of FIG. 4 (front and rear underground passages after passage);

the concrete wall comprises a framework 1, a panel 2, a front concrete bottom plate 3, a front channel 4, a rear channel 4', a front concrete channel top plate 5, a front concrete supporting pile 6, a front concrete supporting pile 7, an anchoring reinforcing steel bar 8, a formwork 9, a trapezoidal block 10, a formwork and front supporting pile space 11, a rubber water stop belt 12, a front left concrete retaining wall 12, a front right concrete retaining wall 12, a rear concrete channel top plate 13, a rear concrete bottom plate 14, a longitudinal reinforcing steel bar 15, a front concrete wall side wall (inner transverse wall of the channel) 16, a transverse reinforcing steel bar 17, a rear left concrete retaining wall 18, a rear right concrete retaining wall 18', a rear right concrete retaining wall a.15-75 degrees, a bevel edges c and b straight edges.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout.

In the description of the present invention, it should be noted that, for the orientation words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate that the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "before" and "after" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, where the definitions of "earlier" and "later" features may or may not explicitly include temporal features, the definitions of "separately" and "a number" in the description of the invention mean two or more, unless a specific definition is explicitly stated otherwise.

The technical scheme and the beneficial effects of the invention are clearer and clearer by further describing the specific embodiment of the invention with the accompanying drawings of the specification. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the application, with reference to the drawings.

Referring to fig. 1 and 2, an embodiment of the present invention provides a construction method for a reserved interface of an underground space connecting channel, where the method includes the following steps:

the first step is as follows: welding a framework 1 by using common section steel, and welding a panel 2 on the surface of the framework 1 to form a trapezoidal block 9; the included angle between the inclined edge c and the straight edge b of the trapezoidal plugging block is set to be 15-75 degrees; the thickness of the trapezoidal block 9 is consistent with that of the side wall (transverse partition wall) of the underground space;

step five: binding vertical steel bars 15 and transverse steel bars 17 between the side wall template 8 and the early-stage concrete support piles 6 respectively, and pouring concrete between the side wall template 8 and the support piles 4 to form early-stage concrete side walls (transverse walls) 16;

Claims

1. A construction method for reserved interfaces of underground space connecting channels is characterized by comprising the following steps: the construction method comprises the following steps:

the first step is as follows: welding a skeleton (1) by using common steel, and welding a panel (2) on the surface of the skeleton to form a trapezoidal block (9); the included angle between the inclined edge (c) and the straight edge (b) of the trapezoidal plugging block is set to be 15-75 degrees;

step two: firstly, driving an early-stage support pile (6), and pouring concrete in a support pile hole to form a support pile; after excavating the early-stage underground passage foundation, pouring a early-stage underground passage concrete bottom plate (3); drilling anchoring steel bars (7) on the early-stage concrete support piles;

step three: installing a front-stage underground passage left and right concrete retaining wall template and a top template, and pouring concrete retaining walls in the left and right concrete retaining wall templates; then respectively welding the anchoring steel bars (7) at one end of the trapezoidal plugging block (9); the other end of the trapezoidal block is contacted with the side wall template (8) together, so that the trapezoidal block (9) is positioned at the position of a reserved interface of the side wall between the early-stage concrete support pile (6) and the side wall template;

step four: after the trapezoidal block (9) is installed in place, a rubber water stop (11) is adhered to the surface of the trapezoidal block (9);

step five: binding vertical steel bars (15) and transverse steel bars (17) between the side wall formwork (8) and the early-stage concrete supporting piles (6) respectively, and pouring concrete between the side wall formwork (8) and the supporting piles (6) to form early-stage concrete side walls (16);

step seven: after the reserved later underground passage is excavated to the reserved interface position of the underground passage and soil reaches the early-stage supporting pile (6), the concrete supporting pile between the early-stage concrete supporting pile (6) and the early-stage concrete supporting pile (6') in the reserved later-stage underground passage is broken, and the concrete side wall (16) and the pre-buried trapezoidal plugging block (9) in the early-stage underground passage are exposed; then, installing retaining wall templates and top templates at the front side and the rear side of the later underground passage (4 '), and pouring concrete in the templates to form a left concrete retaining wall, a right concrete retaining wall (18, 18') and a later concrete passage top plate (13) of the later underground passage;

step eight: a temporary supporting seat is arranged in the early underground space, and a backing plate is additionally arranged at the left end of the trapezoidal plugging block (9); the tail end of the jack is propped against the temporary supporting seat, and a piston rod of the jack is propped against a base plate at the left end of the trapezoidal plugging block (9); the jack is started to apply pressure to the backing plate, the pre-buried trapezoidal plugging blocks (9) are ejected out of the pre-buried trapezoidal plugging blocks (9) from the concrete early-stage side wall (16) under the action of the jack force, and after the trapezoidal plugging blocks (9) are separated from a reserved connecting port on the concrete early-stage side wall (16), the early-stage underground channel (4) is communicated with the later-stage underground channel (4');

step ten: chiseling residual walls around the joints of the concrete early side walls (16), and troweling with cement to form a flat and smooth surface; and finally, pouring a concrete bottom plate (14) in the underground passage (4') in the later period.