CN108457300B - Construction method for replacing support of underground large-span structure by cover-excavation method - Google Patents
Construction method for replacing support of underground large-span structure by cover-excavation method Download PDFInfo
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- CN108457300B CN108457300B CN201810053132.9A CN201810053132A CN108457300B CN 108457300 B CN108457300 B CN 108457300B CN 201810053132 A CN201810053132 A CN 201810053132A CN 108457300 B CN108457300 B CN 108457300B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
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Abstract
The invention relates to a construction method for replacing a support of an underground large-span structure by a cover-excavation method, which comprises the following steps: s1: constructing an underground continuous wall which is supported between two sides of the enclosure structure in a to-be-constructed area of the underground large-span structure, simultaneously embedding a plurality of lattice columns in the underground continuous wall, and arranging the tops of the lattice columns and the top of the underground continuous wall in a flush manner; s2: constructing a top plate of the underground layer, anchoring and connecting the top plate of the underground layer and the top of the underground continuous wall, and excavating earthwork to a set height by a reverse method to expose part of the underground continuous wall; s3: chiseling the exposed earthwork part of the underground continuous wall, and correspondingly exposing latticed columns in the underground continuous wall; s4: continuing to excavate the earthwork to the elevation of the bottom plate of the underground layer, chiseling the part of the underground continuous wall exposed out of the earthwork, and correspondingly exposing the latticed column; s5: constructing a bottom plate of the underground layer, and synchronously constructing structural columns of the underground layer to support a top plate of the underground layer; and S6: and cutting off the latticed column between the top plate of the underground layer and the bottom plate of the underground layer to finish construction. The method has the advantages of few processes, short construction period, high speed and high precision.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method for replacing a support of an underground large-span structure by a cover-excavation method.
Background
The following working conditions exist in the construction of underground structures: the underground diaphragm wall that sets up divides the underground major structure that the total number of piles is two-layer and the underground additional structure that the total number of piles is one deck, for making to link up each other between major structure and the additional structure, need abolish the underground diaphragm wall between the two, then the construction additional structure burden one deck bottom plate and burden one deck structure post.
In the prior art, in the process of breaking an underground continuous wall, a masonry constructional column is used as a top plate temporary support, and after the installation of a main structural column is finished, the constructional column used as the temporary support is removed. However, the process is complicated, the construction speed is low, the installation precision is low, the deformation of the top plate structure is large, and certain safety risks exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method for replacing a support of a cover-excavation underground large-span structure, and solves the problem of low construction efficiency of replacing the support in the prior art.
The technical scheme for realizing the purpose is as follows:
the invention provides a construction method for replacing a support of an underground large-span structure by a cover-excavation method, which comprises the following steps:
s1: constructing an underground continuous wall which is supported between two sides of an enclosure structure in a to-be-constructed area of an underground large-span structure, and simultaneously embedding a plurality of lattice columns in the underground continuous wall, wherein the tops of the lattice columns are arranged in parallel with the top of the underground continuous wall;
s2: constructing a top plate of an underground layer, anchoring and connecting the top plate of the underground layer and the top of the underground continuous wall, and excavating earth to a set height by a reverse construction method to expose part of the underground continuous wall;
s3: chiseling the exposed earthwork part of the underground continuous wall, and correspondingly exposing latticed columns in the underground continuous wall;
s4: continuing to excavate the earthwork to the elevation position of the bottom plate of the underground layer, chiseling the part of the underground continuous wall exposed out of the earthwork, and correspondingly exposing the latticed column;
s5: constructing a bottom plate of an underground layer, and synchronously constructing structural columns of the underground layer to support a top plate of the underground layer; and
s6: and cutting off the latticed column between the top plate of the underground layer and the bottom plate of the underground layer to finish construction.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method has the beneficial effects that:
in the process of constructing the underground continuous wall, the lattice columns are embedded in the underground continuous wall at intervals, and the lattice columns and the underground continuous wall are combined for construction, so that the construction time is saved, and the working efficiency is improved. Therefore, the lattice column can be exposed to temporarily support the top plate in the process of chiseling off the underground continuous wall, so that the underground continuous wall serving as the support can be dismantled and the structural column can be constructed to support. The construction method has the characteristics of less working procedures, short construction period, high speed, high precision and the like, and solves the problems of complex working procedures of building the constructional column firstly and then dismantling the constructional column, low construction speed, low installation precision and large deformation of a top plate structure in the prior art. After the structural column is installed, the lattice column is cut, recycled and reused, and the construction cost is further reduced.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method is further improved in that when the top plate of the underground layer is constructed, the top part of the underground continuous wall is placed in the pouring space of the top plate of the underground layer.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method is further improved in that when the bottom plate of the underground layer is constructed, the bottom plate of the underground layer is fixedly connected with the top of the part, which is not chiseled, of the underground continuous wall and the corresponding lattice column in an anchoring mode.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method is further improved in that when the lattice column is embedded, the bottom of the lattice column is embedded into a set position below the elevation of the bottom plate of the underground layer in the underground continuous wall.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method is further improved in that the setting position is 2-3 m below the elevation of the bottom plate.
The invention further improves the construction method for replacing the support of the underground large-span structure by the cover-excavation method, and the construction of the underground continuous wall comprises the following steps:
excavating to form groove sections, and inserting the lattice columns into the groove sections at intervals; and
and pouring concrete into the groove sections to form the underground continuous wall.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method is further improved in that the set height is half of the height of the underground layer.
The invention further improves the construction method for replacing the support of the underground large-span structure by the cover-excavation method, and the construction method also comprises the following steps before constructing the top plate of the underground layer:
and leveling the bottom of the excavated earthwork, erecting a support frame body and installing a top plate template.
Drawings
Fig. 1 to 6 are schematic diagrams of steps of the construction method for replacing the support of the underground large-span structure by the cover excavation method.
Fig. 7 is a top view of fig. 1.
Fig. 8 is a top view of fig. 5.
Fig. 9 is a cross-sectional view a-a of fig. 8.
Fig. 10 is a sectional view of B-B of fig. 8.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1 to 6, steps of the construction method for replacing the support of the underground large-span structure by the cover excavation method are schematically shown. Referring to fig. 7, a top view of fig. 1 is shown. Fig. 8 is a top view of fig. 5. Referring to fig. 10, a cross-sectional view B-B of fig. 8 is shown. Referring to fig. 1 to 8 and 10, the underground continuous wall 10 is used to support an underground large-span structure previously enclosed by the underground continuous wall. In the present embodiment, an underground continuous wall 10 is provided as a support between the underground main structure 1 having two total floors and the underground auxiliary structure 2 having one total floor. In the subsequent construction, in order to enable the underground main structure 1 and the underground auxiliary structure 2 to be communicated with each other, the underground continuous wall 10 between the underground main structure and the underground auxiliary structure is firstly broken, then the bottom plate 20 of the underground layer is constructed, and the structure column 30 of the underground layer is constructed at the position where the underground continuous wall 10 is removed for supporting. In the process, the support of the underground continuous wall 10 which plays a supporting role needs to be replaced, so the construction method for replacing the support of the underground large-span structure by the cover and excavation method comprises the following steps:
s1: constructing an underground continuous wall which is supported between two sides of the enclosure structure in a to-be-constructed area of the underground large-span structure, simultaneously embedding a plurality of lattice columns in the underground continuous wall, and arranging the tops of the lattice columns and the top of the underground continuous wall in a flush manner;
s2: constructing a top plate of the underground layer, anchoring and connecting the top plate of the underground layer and the top of the underground continuous wall, and excavating earthwork to a set height by a reverse method to expose part of the underground continuous wall;
s3: chiseling the exposed earthwork part of the underground continuous wall, and correspondingly exposing latticed columns in the underground continuous wall;
s4: continuing to excavate the earthwork to the elevation of the bottom plate of the underground layer, chiseling the part of the underground continuous wall exposed out of the earthwork, and correspondingly exposing the latticed column;
s5: constructing a bottom plate of the underground layer, and synchronously constructing structural columns of the underground layer to support a top plate of the underground layer; and
s6: and cutting off the latticed column between the top plate of the underground layer and the bottom plate of the underground layer to finish construction.
In the process of constructing the underground continuous wall, the lattice columns are embedded in the underground continuous wall at intervals, and the lattice columns and the underground continuous wall are combined for construction, so that the construction time is saved, and the working efficiency is improved. Therefore, the lattice columns can be exposed to temporarily support the top plate of the underground layer in the process of chiseling off the underground continuous wall, so that the underground continuous wall serving as the support can be dismantled and the structural columns can be constructed to support. The construction method has the characteristics of less working procedures, short construction period, high speed, high precision and the like, and solves the problems of complex working procedures of building the constructional column firstly and then dismantling the constructional column, low construction speed, low installation precision and large deformation of a top plate structure in the prior art. After the structural column is installed, the lattice column is cut, recycled and reused, and the construction cost is further reduced.
Referring to fig. 1 and 7, as a preferred embodiment of the construction method for replacing the support of the underground large-span structure by the cover-excavation method according to the present invention, the construction of the underground diaphragm wall 10 includes: excavating to form groove sections, and inserting the lattice columns 40 into the groove sections at intervals; and pouring concrete into the groove sections to form the underground continuous wall 10.
Specifically, the position of the structural column 30 to be installed is measured and positioned according to the design requirements of construction, and the lattice column 40 is placed at a position 2m lateral to the position of each structural column 30 to be installed in the groove section. When the lattice column 40 is pre-buried, the bottom of the lattice column 40 is embedded into a set position below the elevation of the bottom plate 20 of the underground layer in the underground continuous wall 10, so that the bottom of the lattice column 40 is firmly fixed with the underground continuous wall 10, and the lattice column 40 is vertically and stably arranged. In the present embodiment, the bottom of the lattice column 40 is embedded in the underground continuous wall 10 at 2m to 3m below the floor level of the underground story. The number of the lattice columns 40 is determined according to actual needs, and after the lattice columns 40 are installed, concrete is poured into the groove sections to complete the construction of the underground continuous wall 10. In this embodiment, the lattice column 40 is a double-spliced lattice column, which enhances the firmness of the lattice column 40 and can be disassembled for use.
Referring to fig. 1 and 2, as a preferred embodiment of the construction method for replacing the support of the underground large-span structure by the cover excavation method according to the present invention, during the construction of the top slab 50 of the underground story, the top portion of the underground continuous wall 10 is placed in the casting space of the top slab 50 of the underground story, so that the top portion of the underground continuous wall 10 and the top slab 50 are connected by anchoring after the top slab 50 is cast. Because the lattice column 40 is pre-buried in the underground continuous wall 10, so the lattice column 40 just anchors in the roof 50 of one-tenth underground to fix the top of lattice column 40, prevent that the lattice column 40 from taking place the slope, guaranteed the stability of the position of lattice column 40, thereby guaranteed the stability of the supporting role of lattice column 40.
As a preferred embodiment of the construction method for replacing the support of the underground large-span structure by the cover-excavation method, before constructing the top plate 50 of the underground layer, the method further comprises the steps of leveling the bottom of the excavated earthwork, setting up a support frame body and installing a template of the top plate 50. Specifically, the earthwork of the underground layer 1/2 is dug downwards and downwards, a concrete cushion layer is poured to harden the flat base layer, a full hall disc buckle type supporting frame body is erected on the cushion layer and a template of the top plate 50 is installed, the concrete of the top plate 50 of the underground layer is poured by using the template of the top plate 50, and the lattice column 40 is anchored into the top plate 50 for fixing, so that the stability of the position of the lattice column 40 is ensured.
As shown in fig. 3, the support frame for casting the top plate 50 is removed. And (3) breaking the underground continuous wall 10 within the range of high earth excavation of an 1/2 underground layer by using an air pick, so that the lattice columns 40 are exposed out of the underground continuous wall 10 to serve as structural supports. The lattice columns 40 support the top plate 50 to prevent the top plate 50 from collapsing, and the stability of the structure is guaranteed.
And as shown in fig. 4, the earthwork is excavated downwards to the elevation of the bottom plate of the underground layer, and the underground continuous wall 10 in the area above the elevation of the bottom plate of the underground layer is chiseled off, so that the lattice column 40 is exposed out of the underground continuous wall 10, and the lattice column replacement support is formed. That is, the underground continuous wall 10 is chiseled to expose the lattice columns 40 between the ceiling 50 and the floor 20, and the lattice columns 40 are used to temporarily support the ceiling 50 instead of the underground continuous wall 10, thereby ensuring the stability of the structure.
Referring to fig. 8, a top view of fig. 5 is shown. Referring to fig. 9, a cross-sectional view a-a of fig. 8 is shown. Referring to fig. 10, a cross-sectional view B-B of fig. 8 is shown. As shown in fig. 5 and 8 to 10, the bottom plate 20 of the underground floor is poured, and the bottom plate 20 of the underground floor is connected to the top of the non-chiseled part of the underground continuous wall 10 and the corresponding lattice column 40 in an anchoring manner, so that the bottom plate 20 is supported by the underground continuous wall 10 located below the bottom plate 20 of the underground floor, and the stability of the bottom plate 20 is ensured. The structural columns 30 are constructed synchronously, so that the whole structure can be supported by the structural columns 30 later, and the stability of the structure is ensured. As shown in fig. 8 and 9, the structural columns 30 to be poured later and the lattice columns 40 to be used as temporary supports are arranged at intervals. The specific spacing is determined according to actual needs.
As shown in fig. 6, the lattice column 40 as the temporary support is cut out and recycled, and the support replacement construction is completed.
The construction method for replacing the support of the underground large-span structure by the cover-excavation method has the beneficial effects that:
in the process of constructing the underground continuous wall, the lattice columns are embedded in the underground continuous wall at intervals, and the lattice columns and the underground continuous wall are combined for construction, so that the construction time is saved, and the working efficiency is improved. Therefore, the lattice column can be exposed to temporarily support the top plate in the process of chiseling off the underground continuous wall, so that the underground continuous wall serving as the support can be dismantled and the structural column can be constructed to support. The construction method has the characteristics of less working procedures, short construction period, high speed, high precision and the like, and solves the problems of complex working procedures of building the constructional column firstly and then dismantling the constructional column, low construction speed, low installation precision and large deformation of a top plate structure in the prior art. After the structural column is installed, the lattice column is cut, recycled and reused, and the construction cost is further reduced.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (4)
1. A construction method for replacing a support of an underground large-span structure by a cover-excavation method is characterized by comprising the following steps:
s1: constructing an underground continuous wall which is supported between two sides of an enclosure structure in a to-be-constructed area of an underground large-span structure, and simultaneously embedding a plurality of lattice columns in the underground continuous wall, wherein the tops of the lattice columns are arranged in parallel with the top of the underground continuous wall;
s2: constructing a top plate of an underground layer, anchoring and connecting the top plate of the underground layer and the top of the underground continuous wall, and excavating earth to a set height by a reverse construction method to expose part of the underground continuous wall;
s3: chiseling the exposed earthwork part of the underground continuous wall, and correspondingly exposing latticed columns in the underground continuous wall;
s4: continuing to excavate the earthwork to the elevation position of the bottom plate of the underground layer, chiseling the part of the underground continuous wall exposed out of the earthwork, and correspondingly exposing the latticed column;
s5: constructing a bottom plate of an underground layer, and synchronously constructing structural columns of the underground layer to support a top plate of the underground layer;
s6: cutting off the latticed column between the top plate of the underground layer and the bottom plate of the underground layer to finish construction;
constructing the underground diaphragm wall includes:
excavating to form groove sections, and inserting the lattice columns into the groove sections at intervals;
pouring concrete into the groove sections to form the underground continuous wall;
when a top plate of an underground layer is constructed, the top part of the underground partition wall is placed in a pouring space of the top plate of the underground layer;
when the bottom plate of the underground layer is constructed, the bottom plate of the underground layer is fixedly connected with the top of the part, which is not chiseled, of the underground partition wall and the corresponding latticed column in an anchoring mode;
when the lattice column is pre-buried, the bottom of the lattice column is embedded into a set position in the underground continuous wall, wherein the set position is located below the bottom plate elevation of the underground layer.
2. The construction method for replacing a support of an underground large-span structure by a cover excavation method according to claim 1,
the setting position is 2m to 3m below the bottom plate elevation.
3. The construction method for replacing a support of an underground large-span structure by a cover excavation method according to claim 1,
the set height is half the height of the underground layer.
4. The method of constructing a cap excavation underground large-span structure for replacing a support according to claim 1, further comprising, before constructing the top slab of the underground story:
and leveling the bottom of the excavated earthwork, erecting a support frame body and installing a top plate template.
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| CN103122642B (en) * | 2013-01-30 | 2014-10-29 | 上海市政工程设计研究总院（集团）有限公司 | Construction method of vertical post support change |
| CN204590038U (en) * | 2015-04-15 | 2015-08-26 | 广东省基础工程集团有限公司 | A kind of permanent foundation pit supporting construction |
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