Concrete trestle and foundation pit connecting node structure and construction method thereof
阅读说明：本技术 混凝土栈桥与基坑连接结点构造及其施工方法 (Concrete trestle and foundation pit connecting node structure and construction method thereof ) 是由 卢焱 李春龙 王丹丹 张创科 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种混凝土栈桥与基坑连接结点构造,包括：基坑支护结构,其包括沿地下连续墙和第一冠梁,所述第一冠梁顶部可拆卸连接有第一栈桥梁；第一栈桥支撑结构,其包括设第一灌注桩、第一钢格构柱及第二冠梁,所述第二冠梁顶部可拆卸连接有第二栈桥梁和第三栈桥梁；第二栈桥支撑结构,其包括第二灌注桩、第二钢格构柱及第三冠梁,所述第三冠梁顶部可拆卸连接有第四栈桥梁；其中,所述第一栈桥梁和第二栈桥梁顶面从连接有倾斜段栈桥,所述第三栈桥梁和第四栈桥梁顶面连接有水平段栈桥。本发明还公开了上述混凝土栈桥与基坑连接结点构造的施工方法。本发明同时改进了原钢筋混凝土栈桥一次性使用无法拆卸和钢结构栈桥刚度弱的问题。(The invention discloses a concrete trestle and foundation pit connection node structure, which comprises: the foundation pit supporting structure comprises an underground continuous wall and a first crown beam, wherein the top of the first crown beam is detachably connected with a first bridge; the first trestle supporting structure comprises a first cast-in-place pile, a first steel lattice column and a second crown beam, wherein the top of the second crown beam is detachably connected with a second trestle beam and a third trestle beam; the second trestle supporting structure comprises a second cast-in-place pile, a second steel lattice column and a third crown beam, and the top of the third crown beam is detachably connected with a fourth trestle; the top surfaces of the first trestle bridge and the second trestle bridge are connected with an inclined section trestle bridge, and the top surfaces of the third trestle bridge and the fourth trestle bridge are connected with a horizontal section trestle bridge. The invention also discloses a construction method of the concrete trestle and foundation pit connection node structure. The invention simultaneously solves the problems that the original reinforced concrete trestle cannot be disassembled after one-time use and the steel structure trestle has weak rigidity.)
1. Concrete trestle and foundation ditch connection node structure, its characterized in that includes:
the foundation pit supporting structure comprises an underground continuous wall arranged along the side wall of a foundation pit and a first crown beam erected at the top end of the underground continuous wall, wherein a first high-strength bolt extending out of the top of the first crown beam is pre-embedded in the first crown beam, the top of the first crown beam is detachably connected with a first bridge beam arranged along the length direction of the first crown beam through the first high-strength bolt, and the top surface of the first bridge beam is obliquely arranged and is higher close to the edge side of the foundation pit than the side close to the center of the foundation pit;
a first trestle supporting structure which is arranged in the area between the edge of the foundation pit and the center of the foundation pit, the first trestle supporting structure comprises a first cast-in-place pile arranged at the bottom of the foundation pit, a first steel lattice column erected at the top of the first cast-in-place pile and a second crown beam arranged at the top of the first steel lattice column, a second high-strength bolt extending out of the top of the second crown beam is embedded in the second crown beam, the top of the second crown beam is detachably connected with a second stack bridge and a third stack bridge which are arranged along the length direction of the second crown beam through the second high-strength bolt, the second trestle bridge is close to the edge of the foundation pit, the third trestle bridge is close to the center of the foundation pit, the top surface of the second trestle bridge is obliquely arranged and the oblique direction of the second trestle bridge is consistent with that of the first trestle bridge, meanwhile, the top surface of the second trestle is coplanar with the top surface of the first trestle, the top surface of the third trestle is horizontal, and the elevation of the top surface of the third trestle is consistent with the elevation of the lowest point of the top surface of the second trestle;
the second trestle supporting structure is arranged in the center area of the foundation pit and comprises a second cast-in-place pile arranged at the bottom of the foundation pit, a second steel lattice column erected at the top of the second cast-in-place pile and a third crown beam arranged at the top of the second steel lattice column, a third high-strength bolt stretching out of the top of the third crown beam is pre-embedded in the third crown beam, the top of the third crown beam is detachably connected with a fourth trestle arranged along the length direction of the third crown beam through the third high-strength bolt, and the top surface of the fourth trestle is horizontal and the elevation of the top surface of the fourth trestle is consistent with the elevation of the top surface of the third trestle;
wherein, first trestle roof beam and second trestle roof beam top surface are supreme slope section I-shaped steel beam and the stack bridge board of slope section of having connected gradually from the bottom, supreme horizontal segment I-shaped steel beam and the stack bridge board of horizontal segment of having connected gradually are followed to third trestle roof beam and fourth trestle roof beam top surface, slope section trestle board one end is set up at the foundation ditch edge, the other end and horizontal segment trestle board butt.
2. The concrete trestle and foundation pit connection node structure of claim 1, wherein a plurality of first auxiliary support steel lattice columns are uniformly arranged between the underground continuous wall and the first steel lattice column at intervals, the elevation of the top of the plurality of first auxiliary support steel lattice columns is gradually reduced from the underground continuous wall to the first steel lattice columns, and the top of each first auxiliary support steel lattice column is connected with the bottom surface of the inclined section trestle plate;
even interval is provided with a plurality of second auxiliary stay steel lattice columns between first steel lattice column and the second steel lattice column, and the top elevation of a plurality of second auxiliary stay steel lattice columns is unanimous, and the top and the horizontal segment landing stage board bottom surface of each second auxiliary stay steel lattice column are connected.
3. The concrete trestle and foundation pit connection node structure of claim 2, wherein first horizontal supporting beams are arranged between the underground continuous wall and the first auxiliary supporting steel lattice column, between two adjacent first auxiliary supporting steel lattice columns and between the first auxiliary supporting steel lattice column and the first steel lattice column;
and second horizontal supporting beams are arranged between the first steel lattice column and the second auxiliary supporting steel lattice column, between two adjacent second auxiliary supporting steel lattice columns and between the second auxiliary supporting steel lattice column and the second steel lattice column.
4. The concrete trestle and foundation pit connection node structure of claim 1, wherein the inclined section trestle plate and the horizontal section trestle plate are both provided with anti-skid strips, the distance between two adjacent anti-skid strips is not more than 2m, and the height of the anti-skid strips is 3-10 cm.
5. The concrete trestle and foundation pit connection node structure of claim 1, wherein guardrails are arranged on both sides of the inclined section trestle plate and the horizontal section trestle plate.
6. The method of constructing a concrete trestle and foundation pit joint structure of claim 1, comprising:
designing and determining a construction scheme of the trestle according to a supporting construction drawing, an investigation report and construction organization design content, and determining the total plane arrangement of the trestle by combining with the actual situation of a site;
constructing an underground continuous wall at the edge of a foundation pit, constructing a first crown beam at the top of the underground continuous wall, wherein a first high-strength bolt extending out of the top of the first crown beam is pre-embedded in the first crown beam, and excavating and repairing soil in the foundation pit until the elevation of a trestle construction scheme is reached;
measuring and lofting to determine the pile positions of a first cast-in-place pile and a second cast-in-place pile, constructing the first cast-in-place pile and the second cast-in-place pile, manufacturing a first steel lattice column and a second steel lattice column outside a foundation pit field at the same time, connecting the first steel lattice column to the top of the first cast-in-place pile after the first cast-in-place pile and the second cast-in-place pile are constructed, constructing a second crown beam on the top of the first steel lattice column, wherein a second high-strength bolt extending out of the top of the second crown beam is embedded in the second crown beam, connecting the second steel lattice column to the top of the second cast-in-place pile, and constructing a third crown beam on the top of the second steel lattice column, wherein a third high-strength bolt extending out of the top of the third crown beam is embedded in the third crown beam;
the method comprises the steps of installing a first trestle girder to the top of a first crown girder, installing a second trestle girder and a third trestle girder to the top of a second crown girder, installing a fourth trestle girder to the top of a third crown girder, then erecting an inclined section I-shaped steel girder between the first trestle girder and the second trestle girder, erecting a horizontal section I-shaped steel girder between the third trestle and the fourth trestle girder, finally laying an inclined section trestle plate on the top surface of the inclined section I-shaped steel girder, and laying a horizontal section trestle plate on the top surface of the horizontal section I-shaped steel girder.
7. The method of claim 6, wherein after the first cast-in-place pile and the second cast-in-place pile are constructed, the positions of the first auxiliary supporting steel lattice columns are determined by measuring and lofting between the underground continuous wall and the first cast-in-place pile, the positions of the second auxiliary supporting steel lattice columns are determined by measuring and lofting between the first cast-in-place pile and the second cast-in-place pile, and after the first steel lattice column and the second steel lattice column are constructed respectively, the construction of the first auxiliary supporting steel lattice columns and the second auxiliary supporting steel lattice columns is resumed.
8. The construction method of the connection node structure of the concrete trestle and the foundation pit according to claim 7, wherein after the construction of the first auxiliary support steel lattice columns and the second auxiliary support steel lattice columns is finished, first horizontal support beams are arranged between the underground continuous wall and the first auxiliary support steel lattice columns, between two adjacent first auxiliary support steel lattice columns and between the first auxiliary support steel lattice columns and the first steel lattice columns;
and second horizontal supporting beams are arranged between the first steel lattice column and the second auxiliary supporting steel lattice column, between two adjacent second auxiliary supporting steel lattice columns and between the second auxiliary supporting steel lattice column and the second steel lattice column.
Technical Field
The invention relates to the field of building construction. More particularly, the present invention relates to a concrete trestle and foundation pit connection node structure and a construction method thereof.
Background
At present, the supporting form of interior support is generally adopted to super large foundation ditch in the work progress, and its supporting member is mostly concrete structure, in order to satisfy the construction requirement of earthwork excavation, needs construction trestle for the vehicle walking of operation or equipment is placed. The traditional trestle is generally an ordinary concrete trestle, but the concrete trestle construction cycle is long, and the concrete can be used after reaching certain intensity, and the underground supporting structure of building needs to be broken away again when the construction, further causes very big influence to construction period and construction environment.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a concrete trestle and foundation pit connection node structure and a construction method thereof, which improve a trestle structure system on the basis of the traditional reinforced concrete trestle and steel structure trestle and simultaneously improve the problems that the original reinforced concrete trestle cannot be disassembled after one-time use and the steel structure trestle has weak rigidity.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a concrete trestle and foundation pit connection node construction including:
the foundation pit supporting structure comprises an underground continuous wall arranged along the side wall of a foundation pit and a first crown beam erected at the top end of the underground continuous wall, wherein a first high-strength bolt extending out of the top of the first crown beam is pre-embedded in the first crown beam, the top of the first crown beam is detachably connected with a first bridge beam arranged along the length direction of the first crown beam through the first high-strength bolt, and the top surface of the first bridge beam is obliquely arranged and is higher close to the edge side of the foundation pit than the side close to the center of the foundation pit;
a first trestle supporting structure which is arranged in the area between the edge of the foundation pit and the center of the foundation pit, the first trestle supporting structure comprises a first cast-in-place pile arranged at the bottom of the foundation pit, a first steel lattice column erected at the top of the first cast-in-place pile and a second crown beam arranged at the top of the first steel lattice column, a second high-strength bolt extending out of the top of the second crown beam is embedded in the second crown beam, the top of the second crown beam is detachably connected with a second stack bridge and a third stack bridge which are arranged along the length direction of the second crown beam through the second high-strength bolt, the second trestle bridge is close to the edge of the foundation pit, the third trestle bridge is close to the center of the foundation pit, the top surface of the second trestle bridge is obliquely arranged and the oblique direction of the second trestle bridge is consistent with that of the first trestle bridge, meanwhile, the top surface of the second trestle is coplanar with the top surface of the first trestle, the top surface of the third trestle is horizontal, and the elevation of the top surface of the third trestle is consistent with the elevation of the lowest point of the top surface of the second trestle;
the second trestle supporting structure is arranged in the center area of the foundation pit and comprises a second cast-in-place pile arranged at the bottom of the foundation pit, a second steel lattice column erected at the top of the second cast-in-place pile and a third crown beam arranged at the top of the second steel lattice column, a third high-strength bolt stretching out of the top of the third crown beam is pre-embedded in the third crown beam, the top of the third crown beam is detachably connected with a fourth trestle arranged along the length direction of the third crown beam through the third high-strength bolt, and the top surface of the fourth trestle is horizontal and the elevation of the top surface of the fourth trestle is consistent with the elevation of the top surface of the third trestle;
wherein, first trestle roof beam and second trestle roof beam top surface are supreme slope section I-shaped steel beam and the stack bridge board of slope section of having connected gradually from the bottom, supreme horizontal segment I-shaped steel beam and the stack bridge board of horizontal segment of having connected gradually are followed to third trestle roof beam and fourth trestle roof beam top surface, slope section trestle board one end is set up at the foundation ditch edge, the other end and horizontal segment trestle board butt.
Preferably, a plurality of first auxiliary supporting steel lattice columns are uniformly arranged between the underground continuous wall and the first steel lattice columns at intervals, the elevations of the tops of the plurality of first auxiliary supporting steel lattice columns are gradually reduced from the underground continuous wall to the first steel lattice columns, and the top of each first auxiliary supporting steel lattice column is connected with the bottom surface of the inclined section trestle plate;
even interval is provided with a plurality of second auxiliary stay steel lattice columns between first steel lattice column and the second steel lattice column, and the top elevation of a plurality of second auxiliary stay steel lattice columns is unanimous, and the top and the horizontal segment landing stage board bottom surface of each second auxiliary stay steel lattice column are connected.
Preferably, first horizontal supporting beams are arranged between the underground continuous wall and the first auxiliary supporting steel lattice column, between two adjacent first auxiliary supporting steel lattice columns and between the first auxiliary supporting steel lattice column and the first steel lattice column;
and second horizontal supporting beams are arranged between the first steel lattice column and the second auxiliary supporting steel lattice column, between two adjacent second auxiliary supporting steel lattice columns and between the second auxiliary supporting steel lattice column and the second steel lattice column.
Preferably, the surfaces of the inclined section trestle plate and the horizontal section trestle plate are both provided with anti-slip strips, the distance between every two adjacent anti-slip strips is not more than 2m, and the height of each anti-slip strip is 3-10 cm.
Preferably, the two sides of the inclined section bridge plate and the horizontal section bridge plate are both provided with guardrails.
The invention also provides a construction method of the concrete trestle and foundation pit connection node structure, which comprises the following steps:
designing and determining a construction scheme of the trestle according to a supporting construction drawing, an investigation report and construction organization design content, and determining the total plane arrangement of the trestle by combining with the actual situation of a site;
constructing an underground continuous wall at the edge of a foundation pit, constructing a first crown beam at the top of the underground continuous wall, wherein a first high-strength bolt extending out of the top of the first crown beam is pre-embedded in the first crown beam, and excavating and repairing soil in the foundation pit until the elevation of a trestle construction scheme is reached;
measuring and lofting to determine the pile positions of a first cast-in-place pile and a second cast-in-place pile, constructing the first cast-in-place pile and the second cast-in-place pile, manufacturing a first steel lattice column and a second steel lattice column outside a foundation pit field at the same time, connecting the first steel lattice column to the top of the first cast-in-place pile after the first cast-in-place pile and the second cast-in-place pile are constructed, constructing a second crown beam on the top of the first steel lattice column, wherein a second high-strength bolt extending out of the top of the second crown beam is embedded in the second crown beam, connecting the second steel lattice column to the top of the second cast-in-place pile, and constructing a third crown beam on the top of the second steel lattice column, wherein a third high-strength bolt extending out of the top of the third crown beam is embedded in the third crown beam;
the method comprises the steps of installing a first trestle girder to the top of a first crown girder, installing a second trestle girder and a third trestle girder to the top of a second crown girder, installing a fourth trestle girder to the top of a third crown girder, then erecting an inclined section I-shaped steel girder between the first trestle girder and the second trestle girder, erecting a horizontal section I-shaped steel girder between the third trestle and the fourth trestle girder, finally laying an inclined section trestle plate on the top surface of the inclined section I-shaped steel girder, and laying a horizontal section trestle plate on the top surface of the horizontal section I-shaped steel girder.
Preferably, after the construction of the first cast-in-place pile and the second cast-in-place pile is completed, measuring lofting between the underground continuous wall and the first cast-in-place pile to determine a plurality of first auxiliary support steel lattice column pile positions, measuring lofting between the first cast-in-place pile and the second cast-in-place pile to determine a plurality of second auxiliary support steel lattice column pile positions, and after the first steel lattice column and the second steel lattice column are respectively constructed, starting to construct a plurality of first auxiliary support steel lattice columns and a plurality of second auxiliary support steel lattice columns.
Preferably, after the construction of the plurality of first auxiliary support steel lattice columns and the plurality of second auxiliary support steel lattice columns is finished, first horizontal support cross beams are arranged between the underground continuous wall and the first auxiliary support steel lattice columns, between two adjacent first auxiliary support steel lattice columns and between the first auxiliary support steel lattice columns and the first steel lattice columns;
and second horizontal supporting beams are arranged between the first steel lattice column and the second auxiliary supporting steel lattice column, between two adjacent second auxiliary supporting steel lattice columns and between the second auxiliary supporting steel lattice column and the second steel lattice column.
The invention at least comprises the following beneficial effects: the underground continuous wall of the foundation pit supporting structure is used as a part of a trestle system, so that the support can be provided for the trestle, the underground continuous wall can be kept for continuous use after foundation pit construction is finished, manpower and capital are saved, the construction period is shortened, meanwhile, the bottom supporting part of the cast-in-place pile serving as the steel lattice column fully exerts the characteristics of large rigidity and strong bearing capacity of the steel-concrete structure, the steel lattice column is adopted at the top of the cast-in-place pile, the high-strength bolt is embedded in the crown beam to connect the I-shaped steel beam and the trestle plate through the bolt, the steel structure is also fully exerted to be detachable, the installation is convenient and fast, meanwhile, the steel structure components can be reused, and the cost is.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic side view of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a concrete trestle and foundation pit connection node structure, including:
the foundation pit supporting structure comprises an underground continuous wall 1 arranged along the side wall of a foundation pit and a
the first trestle supporting structure is arranged in an area between the edge of a foundation pit and the center of the foundation pit, the first trestle supporting structure comprises a first cast-in-
the second trestle supporting structure is arranged in the center area of the foundation pit and comprises a second cast-in-
wherein,
In another embodiment, a plurality of first auxiliary supporting
even interval is provided with a plurality of second auxiliary stay
In another embodiment, a first horizontal supporting
second horizontal supporting
In another embodiment, the surfaces of the inclined
In another embodiment, the inclined
The invention also provides a construction method of the concrete trestle and foundation pit connection node structure, which comprises the following steps:
designing and determining a construction scheme of the trestle according to a supporting construction drawing, an investigation report and construction organization design content, and determining the total plane arrangement of the trestle by combining with the actual situation of a site;
constructing an underground continuous wall 1 at the edge of a foundation pit, and constructing a
measuring and lofting to determine the pile positions of a first cast-in-
the method comprises the steps of installing a
In another embodiment, after the first cast-in-
In another embodiment, after the construction of the first auxiliary supporting
second horizontal supporting
In the use process of the embodiment, the underground continuous wall 1 of the foundation pit supporting structure is used as one part of a trestle system, the support can be provided for the trestle, the underground continuous wall can be kept to be continuously used after foundation pit construction is finished, labor and capital are saved, the construction period is shortened, meanwhile, the bottom supporting part of the cast-in-place pile used as the steel lattice column fully exerts the characteristics of large rigidity and strong bearing capacity of the steel-concrete structure, the steel lattice column is adopted at the top of the cast-in-place pile, and the high-strength bolts embedded in the crown beam are used for connecting the I-shaped steel beam and the trestle plate through the bolts, so that the characteristics of being detachable and convenient to install are fully exerted, meanwhile, the steel structural components can be repeatedly used, and the cost is saved.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
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