阅读说明：本技术 一种框架结构建筑物下坡移位地下增层方法 (Underground storey-adding method for downhill displacement of frame structure building ) 是由 贾强 张鑫 周广强 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种框架结构建筑物下坡移位地下增层方法,属于建筑物地下增层技术领域,其技术方案为：包括以下步骤：开挖土方暴露框架结构建筑物底部的独立基础；在每一独立基础侧部或顶部钻孔施工灌注桩；在框架柱两侧施工顶部为斜面的下坡轨道,在下坡轨道顶面设置滑块托换梁；截断框架柱,使框架柱截断位置上方结构沿下坡轨道移至止挡位置；将相对应的框架柱与灌注桩对齐,将二者固定连接,并将二者之间的空隙填实；拆除滑块托换梁、下坡轨道和独立基础,施工拟建地下室顶梁、顶板、底板；施工地下室外墙,回填土方,恢复地面。(The invention discloses a method for underground storey addition by downhill displacement of a frame structure building, which belongs to the technical field of underground storey addition of buildings and adopts the technical scheme that: the method comprises the following steps: excavating an independent foundation at the bottom of the earthwork exposed frame structure building; drilling a hole on the side or the top of each independent foundation to construct a cast-in-place pile; constructing downhill tracks with inclined surfaces at the tops on two sides of the frame columns, and arranging slide block underpinning beams on the top surfaces of the downhill tracks; cutting off the frame column, and moving the structure above the cutting-off position of the frame column to a stop position along the downhill track; aligning the corresponding frame column with the cast-in-place pile, fixedly connecting the frame column with the cast-in-place pile, and filling a gap between the frame column and the cast-in-place pile; dismantling the slide block underpinning beam, the downhill track and the independent foundation, and constructing and building a top beam, a top plate and a bottom plate of the basement; and (5) constructing the outer wall of the basement, backfilling earth and restoring the ground.)

1. A method for underground storey addition by downhill displacement of a frame structure building is characterized by comprising the following steps:

excavating an independent foundation at the bottom of the earthwork exposed frame structure building;

drilling a hole on the side or the top of each independent foundation to construct a cast-in-place pile;

constructing downhill tracks with inclined surfaces at the tops on two sides of the frame columns, and arranging slide block underpinning beams on the top surfaces of the downhill tracks;

cutting off the frame column, and moving the structure above the cutting-off position of the frame column to a stop position along the downhill track;

aligning the corresponding frame column with the cast-in-place pile, fixedly connecting the frame column with the cast-in-place pile, and filling a gap between the frame column and the cast-in-place pile;

dismantling the slide block underpinning beam, the downhill track and the independent foundation, and constructing and building a top beam, a top plate and a bottom plate of the basement;

and (5) constructing the outer wall of the basement, backfilling earth and restoring the ground.

2. The method of claim 1, wherein the cross-sectional area of the excavated earth is larger than the cross-sectional area of the frame structure building.

3. A method for the downhill displacement of an underground storey according to claim 1, wherein the cast-in-place piles are parallel to the axial direction of the frame columns, and the distance between adjacent cast-in-place piles is equal to the distance between adjacent frame columns.

4. The method for underground story-increasing by moving a building with a frame structure downhill according to claim 1, wherein the slope directions of the downhill rails corresponding to the plurality of frame columns are the same; and a stop is arranged at the lower end of the downhill track, and the horizontal distance from the stop to the end part of the slide block supporting beam is equal to the horizontal distance from the frame column to the cast-in-place pile.

5. A method for moving underground layer by building with frame structure in downhill mode according to claim 1 or 4, characterized by that the slope of the downhill track is such that the horizontal component of oblique force of building is greater than the static friction force between the slide supporting beam and the downhill track.

6. The method for underground story-increasing by moving the building with frame structure downward slope according to claim 1, wherein the downward slope track is parallel to the direction of the line connecting the top of the cast-in-place pile and the bottom of the frame pile.

7. The method as claimed in claim 1, wherein the slide block underpinning beam is obliquely arranged and connected with the frame column by means of bar planting.

8. The method for underground storey addition by downhill displacement of a frame structure building according to claim 1, wherein the way of fixedly connecting the cast-in-place piles and the frame columns is as follows: and welding corresponding cast-in-place pile steel bars and frame column steel bars together in a lap welding mode.

9. A method for downhill displacement of an underground storey according to claim 1, wherein the gaps between the corresponding cast-in-place piles and the frame columns are filled with fine aggregate concrete.

10. The method for underground storey addition by downhill displacement of a frame structure building according to claim 1, wherein a top beam and a top plate of a basement are constructed at the elevation position of an independent foundation base, the top beam and the top plate are connected with a cast-in-place pile, then earthwork is excavated, and precipitation and slope support are carried out; and exposing the cast-in-place pile until the position of the basement bottom plate, and constructing to build the basement bottom plate.

Technical Field

The invention belongs to the technical field of underground storey addition of buildings, and particularly relates to a method for underground storey addition of a frame structure building through downhill displacement.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The method develops and utilizes the underground space resources of the existing buildings orderly, reasonably, comprehensively and efficiently, and becomes one of the most effective ways of expanding the capacity of infrastructure, improving the comprehensive disaster prevention capability of cities, improving the land utilization efficiency and saving land resources. The development and utilization of underground space are considered in the newly built buildings. However, a lot of existing buildings are not designed with underground parking lots, and a parking difficulty occurs as the number of automobiles increases.

In the existing building underground storey-adding technology, due to the existence of vertical members such as upper structure walls, columns and the like, the construction of basement columns and walls under the vertical members is difficult, and due to the fact that the basement columns and walls are not aligned with the upper structure columns and the walls in plane positions and are unreasonable in stress, the existing building underground storey-adding mode is difficult to operate and low in construction efficiency.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a method for underground storey addition by downhill displacement of a frame structure building.

In order to achieve the purpose, the invention is realized by the following technical scheme:

in a first aspect, the invention provides a method for underground storey addition by downhill displacement of a frame structure building, which comprises the following steps:

excavating an independent foundation at the bottom of the earthwork exposed frame structure building;

drilling a hole on the side or the top of each independent foundation to construct a cast-in-place pile;

constructing downhill tracks with inclined surfaces at the tops on two sides of the frame columns, and arranging slide block underpinning beams on the top surfaces of the downhill tracks;

cutting off the frame column, and moving the structure above the cutting-off position of the frame column to a stop position along the downhill track;

aligning the corresponding frame column with the cast-in-place pile, fixedly connecting the frame column with the cast-in-place pile, and filling a gap between the frame column and the cast-in-place pile;

dismantling the slide block underpinning beam, the downhill track and the independent foundation, and constructing and building a top beam, a top plate and a bottom plate of the basement;

and (5) constructing the outer wall of the basement, backfilling earth and restoring the ground.

As a further technical scheme, when the earthwork is excavated, the cross-sectional area of the excavated earthwork is larger than that of the frame structure building.

As a further technical scheme, the axial direction of the cast-in-place piles is parallel to the axial direction of the frame columns, and the distance between every two adjacent cast-in-place piles is equal to the distance between every two adjacent frame columns.

As a further technical scheme, the slope directions of the slope surfaces of the downhill tracks corresponding to a plurality of frame columns are the same; and a stop is arranged at the lower end of the downhill track, and the horizontal distance from the stop to the end part of the slide block supporting beam is equal to the horizontal distance from the frame column to the cast-in-place pile.

As a further technical scheme, the slope of the downhill track enables the inclined horizontal component force of the building to be larger than the static friction force between the slide block underpinning beam and the downhill track.

As a further technical scheme, the downhill track is parallel to the connecting line direction of the top of the cast-in-place pile and the bottom of the frame column.

As a further technical scheme, the slide block underpinning beam is obliquely arranged and is connected with the frame column in a rib planting mode.

As a further technical scheme, the fixed connection mode of the cast-in-place pile and the frame column is as follows: and welding corresponding cast-in-place pile steel bars and frame column steel bars together in a lap welding mode.

As a further technical scheme, gaps between corresponding cast-in-place piles and frame columns are filled with fine aggregate concrete.

As a further technical scheme, a top beam and a top plate of a proposed basement are constructed at the elevation position of an independent foundation base, the top beam and the top plate are connected with a cast-in-place pile, then earthwork is excavated, and precipitation and slope support are carried out; and exposing the cast-in-place pile until the position of the basement bottom plate, and constructing to build the basement bottom plate.

The beneficial effects of the invention are as follows:

the underground storey-adding method for downhill displacement comprises the steps of firstly constructing cast-in-situ bored piles at positions close to a building, then arranging the downhill tracks and the slide block underpinning beams, cutting off the building, displacing the upper part of the building to a stop position along with the downhill tracks, fixedly connecting the cast-in-situ bored piles with the building frame columns, and constructing a basement after excavating earthwork, so that the underground storey-adding construction efficiency of the building is improved, and the underground storey-adding method is convenient and easy to operate.

According to the underground storey-adding method for downhill displacement, disclosed by the invention, the traction or pushing device for horizontal displacement is saved by adopting downhill sliding in the displacement process, the cost is saved, the operation is simpler and more convenient, and the displacement is easier.

The method for underground storey addition by downhill displacement disclosed by the invention has the advantages that the constructed cast-in-situ bored pile is used as a temporary support for the construction basement of the existing building and a permanent member for the proposed basement, subsequent treatment is not needed, and two purposes are achieved by one action, so that the construction time is saved, and reliable support is provided for the existing building.

According to the method for underground storey addition through downhill displacement, firstly, a cast-in-place bored pile is constructed, then, after a frame structure building is cut off, the cast-in-place bored pile is vertically aligned with a frame column, which is more convenient than the method for directly constructing basement columns and walls under the frame column, and the cast-in-place bored pile after storey addition is vertically aligned with the frame column, so that the stress of vertical members of the basement constructed on the periphery of the frame column is more reasonable than that of vertical members of the basement constructed on the periphery of the frame column; meanwhile, the arrangement of the slide block underpinning beam in the shifting process can transfer upper load, and the problem of unreasonable stress is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a flow diagram of a method for downhill shifting a subterranean zone according to one or more embodiments of the present disclosure;

FIG. 2 is an elevation of an underground storey building to be displaced;

FIG. 3 is a plan view of an underground story-building to be displaced;

FIG. 4 is an elevation view of an exposed foundation of an excavated foundation pit;

FIG. 5 is a plan view of an exposed foundation of an excavated pit;

FIG. 6 is an elevation view of a bored pile constructed on one side of a foundation;

FIG. 7 is a plan view of a bored pile constructed on one side of a foundation;

FIG. 8 is an elevation view of a construction downhill track;

FIG. 9 is a plan view of a construction downhill track;

FIG. 10 is an elevation view of a construction slide underpinning beam;

FIG. 11 is a plan view of a construction slide underpinning beam;

FIG. 12 is an elevation view of the frame structure slid down over and connected to the cast-in-place pile;

FIG. 13 is a plan view of the frame structure being slid down over and connected to the cast-in-place pile;

FIG. 14 is an elevational view of the underpinning beam, downhill track and free-standing foundation removed;

FIG. 15 is a plan view of the underpinning beam, downhill track and isolated foundation removed;

FIG. 16 is an elevation view of the top slab and cap of a construction basement;

FIG. 17 is a plan view of the top slab and top beam of the construction basement;

FIG. 18 is a bottom elevation view of a proposed basement after earthwork excavation;

FIG. 19 is an elevation view of a basement floor under construction;

FIG. 20 is an elevation view of the basement after backfilling earth and recovering the ground;

in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;

the method comprises the following steps of 1, independent foundation, 2, frame column, 3, frame beam plate, 4, shallow foundation soil, 5, deep foundation soil, 6, foundation pit, 7, cast-in-place pile, 8, downhill track, 9, stop, 10, slide block supporting and changing beam, 11, building top beam of basement, and 12, building bottom plate of basement.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

As shown in fig. 2, the frame structure building is formed by arranging frame columns 2 at the bottom of an independent foundation 1, the independent foundation 1 is buried in shallow foundation soil 4 of a stratum, deep foundation soil 5 is arranged below the shallow foundation soil, the frame columns 2 are vertically arranged, and transverse frame beam plates 3 are arranged between the frame columns.

In an exemplary embodiment of the present invention, as shown in fig. 1, a method for downhill shifting an underground story-building of a frame structure building is provided, which includes the following steps:

s1: excavating an independent foundation 1 at the bottom of the earthwork exposed frame structure building;

in the process of the step, earthwork is excavated around the frame structure building, the excavated cross section area is larger than that of the frame structure building, so that an independent foundation can be exposed, and a foundation pit 6 is formed at the independent foundation of the frame structure building after excavation.

S2: drilling a hole on the side or the top of each independent foundation to construct a cast-in-place pile 7;

in the process of the step, the cast-in-place pile can be arranged on the side part of the independent foundation, the side part of the cast-in-place pile is tightly attached to the side edge of the independent foundation, and the reinforced concrete cast-in-place pile is constructed in a drilling mode; the bottom of the cast-in-place pile extends inwards to the foundation and can extend to deep foundation soil.

In the step process, if the drilling machine can break the concrete, the cast-in-place pile can be drilled on the top surface of the independent foundation and extend downwards to form the cast-in-place pile.

The bearing capacity and stability of the cast-in-place pile are calculated according to the load borne by the basement column during use.

The bored concrete pile is parallel with the frame post axis direction, in this embodiment, sets up the bored concrete pile vertically.

The distance between adjacent cast-in-place piles is equal to the distance between adjacent frame columns, and the cast-in-place piles are aligned with the frame columns after the frame structure building is horizontally displaced.

The positions of the cast-in-place piles and the frame columns are distributed and the number of the cast-in-place piles and the frame columns are in one-to-one correspondence.

The pile top of the cast-in-place pile is higher than the bottom of the foundation pit, and the pile top elevation of the cast-in-place pile is determined according to the elevation of the pile root and the downward sliding gradient.

S3: constructing concrete downhill tracks 8 with inclined surfaces at the tops on two sides of the frame columns;

the downhill tracks on the two sides of the frame column are arranged in parallel and oppositely, and the downhill tracks on the two sides of the frame column form a pair for displacing the same frame column in the subsequent process.

The downhill track is parallel to the direction of the connecting line between the top of the cast-in-place pile and the bottom of the frame column, and in this embodiment, the downhill track is arranged horizontally.

The tops of the downhill rails are inclined planes, and the inclined planes at the tops of the downhill rails corresponding to the plurality of frame columns have the same inclination direction, so that the frame columns can be conveniently displaced.

The lower end of the downhill track is provided with a stop 9, the horizontal distance from the stop to the end part of the underpinning beam is the horizontal distance from the frame column to the cast-in-place pile, and the stop can limit the displacement position of the frame column.

The downhill track extends 500mm outwards from the side of the frame column remote from the cast-in-place pile and the other end to the cast-in-place pile and extends 500mm outwards.

The slope of the downhill track should ensure that the inclined horizontal component force of the building is greater than the static friction force between the underpinning beam and the track, namely:

α≥arctgμ

in the formula, alpha is the gradient of the downhill track; mu is the static friction coefficient between the underpinning beam and the downhill track.

S4: arranging a slide block underpinning beam 10 on the top surface of the downhill track;

the slide block underpinning beam is also arranged obliquely and can move along the downhill track.

The arrangement steps of the slide block underpinning beam are as follows:

and (3) paving channel steel on the top of the downhill track to serve as a bottom template of the underpinning beam, and pouring concrete at the top of the channel steel to form the slide block underpinning beam.

Because the downhill tracks are arranged on two sides of the frame column, the molded slide block underpinning beams are also arranged on two sides of the frame column; the underpinning beams on the two sides are connected with the frame columns in a rib planting mode.

In this embodiment the underpinning beams extend 500mm outwards from the frame post.

S5: the cut-off frame column is connected with the independent foundation, so that the upper structure becomes a movable structure taking the sliding block underpinning beam as a walking device;

in the process of the step, the cutting-off position of the frame column is the position where the frame column is positioned at the bottom of the underpinning beam.

Because the underpinning beam is connected with the frame column, the part of the frame structure building above the cutting position and the slide block underpinning beam can walk along the downhill track, namely the movable structure.

S6: after the frame column and the independent foundation are cut off, the upper structure slides to the position above the cast-in-place pile along the downhill track, and the sliding is stopped at the stop position, so that the frame column is aligned with the corresponding cast-in-place pile;

during the step, the bottom of the slide block underpinning beam slides obliquely along the downhill track, and then the whole structure moves along the downhill track.

S7: fixedly connecting the corresponding cast-in-place pile with the frame column, and filling a gap between the corresponding cast-in-place pile and the frame column;

in the process of the step, corresponding cast-in-place pile steel bars and frame column steel bars are welded together in a lap welding mode, so that the cast-in-place piles and the frame columns are fixedly connected.

The gap between the cast-in-place pile and the frame column can be filled with fine aggregate concrete.

S8: and (4) removing the underpinning beam, and removing the downhill track and the independent foundation.

S9: a top beam 11 and a top plate of the basement are constructed at the elevation position of the original independent foundation base, and the top beam and the top plate are connected with a cast-in-place pile.

S10: excavating earthwork step by step, and carrying out precipitation and slope support; and exposing the cast-in-place pile until the position of the basement bottom plate.

S11: the basement bottom plate 12 is planned for construction.

S12: and (5) constructing the outer wall of the basement, backfilling earth and restoring the ground.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.