CN219175307U - Large-thickness variable-section raft foundation structure - Google Patents

Abstract

The utility model discloses a large-thickness variable-section raft foundation structure, which comprises a retaining wall and raft steel bar steel tube supporting frames, wherein the retaining wall is arranged around the periphery of a raft foundation, the retaining wall comprises a bottom retaining wall and a top retaining wall which are formed in a layered mode from bottom to top, the raft steel bar steel tube supporting frames comprise concrete cushion blocks, lower steel bars, bottom brackets, steel tube stand columns, steel tube cross beams, middle steel bars and upper steel bars, the concrete cushion blocks are distributed on the inner bottom of the raft foundation along a matrix, the lower steel bars are vertically and horizontally connected to the concrete cushion blocks, the bottom brackets are distributed on the lower steel bars along the matrix, each bottom bracket is connected with one steel tube stand column, the middle part of each steel tube stand column is connected with one or more than one layer of steel tube cross beams and middle steel bars, and the top of each steel tube stand column is connected with one layer of steel tube cross beams and upper steel bars. The raft foundation can well form a stable raft foundation, and the consumption of steel bars can be reduced, so that the cost is saved.

Description

Large-thickness variable-section raft foundation structure

Technical Field

The utility model relates to the technical field of building raft foundations, in particular to a large-thickness variable-section raft foundation structure.

Background

The raft foundation is a foundation structure adopted in the existing building according to the conditions of foundation types, soil layer distribution and the like, wherein the large-thickness variable-section raft foundation is also called an ultra-thick variable-section raft foundation, because the lowest height difference at the highest position is large, the raft foundation needs high structural requirements on the pit high side surface in the pit, meanwhile, the foundation bearing capacity of the building is required to be borne, when the number of building layers is higher, the thickness is larger, the height difference of the retaining wall foundation is also larger, and the influences of soil layer constitution, rock mass characteristics and the like are also caused, the structure of the conventional or old raft foundation cannot meet the requirements, because the raft foundation is mainly composed of reinforcing steel bars, the using amount of the reinforcing steel bars is easy to be rapidly increased, and the strength of the conventional structure is reduced along with the thickness increase.

Disclosure of Invention

The purpose of the utility model is that: the large-thickness variable-section raft foundation structure is good in structure, low in economic cost and firm in structure.

The utility model provides a large thickness variable cross section raft foundation structure, includes barricade and raft reinforcing steel bar steel pipe support frame, the barricade sets up at the periphery of raft foundation around the ground, the barricade includes by lower supreme fashioned bottom barricade and top layer barricade, raft reinforcing steel pipe support frame includes concrete pad piece, lower floor's reinforcing steel bar, collet, steel pipe stand, steel pipe crossbeam, middle level reinforcing steel bar and upper reinforcing steel bar, concrete pad piece is on the interior bottom of raft foundation along matrix distribution, lower floor's reinforcing steel bar vertically and horizontally distributed connects on the concrete pad piece, the collet is connected along matrix distribution on the lower floor's reinforcing steel bar, every connect one on the collet steel pipe stand, one deck or more steel pipe crossbeam and middle level reinforcing steel bar are connected to the middle part of steel pipe stand, the top of steel pipe stand is connected with one deck steel pipe crossbeam and upper reinforcing steel bar.

As a preferable scheme of the utility model, the bottom support is shaped like a Chinese character 'Tu', the bottom support is connected with the lower layer of reinforcing steel bar by spot welding, and the lower end of the steel pipe upright post is sleeved with the upper end of the bottom support.

As a preferable scheme of the utility model, the shoe is made of steel pipes with diameters of more than or equal to 28mm, and the height of the shoe is 260-360 mm.

As a preferable scheme of the utility model, the middle layer steel bar and the upper layer steel bar are respectively connected to the upper side of the steel pipe beam through binding.

As a preferable scheme of the utility model, the steel pipe upright post is buckled with the steel pipe cross beam through a fastener.

As the preferable scheme of the utility model, the bottom layer retaining wall is made by backfilling concrete between an earth side slope and a single-sided wood formwork support, and the top layer retaining wall is made by casting concrete in the double-sided wood formwork support.

As a preferable scheme of the utility model, the inner side wall of the raft foundation is provided with a water stop steel plate.

Compared with the prior art, the large-thickness variable-section raft foundation structure has the beneficial effects that: not only can the construction inconvenience of high thickness and large substrate height difference be well solved, but also the stable raft foundation can be well formed, the consumption of reinforcing steel bars can be reduced, and the cost is saved.

Drawings

Fig. 1 is a schematic view of a construction structure of a retaining wall at a bottom layer according to an embodiment of the present utility model;

FIG. 2 is a schematic view of construction structures of a bottom retaining wall and a top retaining wall according to an embodiment of the present utility model;

fig. 3 is a schematic view of a construction structure of a top retaining wall according to an embodiment of the present utility model;

fig. 4 is a schematic view of a construction structure of a raft reinforcement steel pipe support frame in an embodiment of the utility model;

fig. 5 is a schematic view of a partial structure of a raft reinforcement steel tube support frame in an embodiment of the present utility model;

FIG. 6 is an enlarged schematic view of a construction structure at a shoe in an embodiment of the utility model;

fig. 7 is a schematic view of a construction structure of a raft foundation cast and layered forming in an embodiment of the utility model.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly in this application, and may be either fixedly connected, detachably connected, or integrally connected, for example, unless otherwise explicitly stated and defined; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present utility model, it should be further understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the machine or element in question must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the utility model.

Referring to fig. 1-5, an exemplary large-thickness variable-section raft foundation structure comprises a retaining wall and a raft steel bar steel tube support frame, wherein the retaining wall is arranged around the periphery of the raft foundation, the retaining wall comprises a bottom retaining wall and a top retaining wall which are formed in a layered mode from bottom to top, the raft steel bar steel tube support frame comprises a concrete cushion block 31, a lower layer steel bar 32, a bottom bracket 33, a steel tube column 34, a steel tube beam 35, a middle layer steel bar 36 and an upper layer steel bar 37, the concrete cushion block 31 is distributed on the inner bottom of the raft foundation along a matrix, the lower layer steel bar 32 is connected with the concrete cushion block 31 in a longitudinal and transverse distribution manner, the bottom bracket 33 is connected with the lower layer steel bar 32 along the matrix in a distributed manner, each bottom bracket 33 is connected with one steel tube column 34, the middle part of the steel tube column 34 is connected with one or more steel tube beams 35 and the middle layer steel bar 36, and the top of the steel tube column 34 is connected with one layer of beams 35 and the upper layer steel bar 37, thereby the raft foundation is well formed, the high-thickness and the great height difference is well, the consumption of the raft foundation is well reduced, and the construction cost is well reduced.

Illustratively, the shoe 33 is made of a steel pipe with a diameter of 28mm or more, and the height of the shoe 33 is 260mm to 360mm.

Illustratively, the middle layer steel bar 36 and the upper layer steel bar 37 are respectively connected to the upper side of the steel pipe beam 35 through binding, so that the construction is easy, and the structure is firm.

Illustratively, the steel pipe column 34 is fastened to the steel pipe beam 35 by a fastener, which further reduces the construction time.

Referring to fig. 1 to 3, the bottom retaining wall is exemplarily made of concrete backfill between an earth slope and a single-sided timber formwork support 21, and the top retaining wall is made of cast concrete in a double-sided timber formwork support 24, thereby ensuring simple construction of the bottom retaining wall and having a firm structure, and effectively reducing the amount of concrete used for the top retaining wall.

Referring to fig. 1 to 7, a construction process of a large-thickness variable cross-section raft foundation structure according to a preferred embodiment of the present utility model includes the steps of: firstly, after earthwork is excavated, a cushion layer 1 is constructed, when the cushion layer 1 with the base height difference being more than 0.5m and less than 2m is constructed, a single-sided wood template support 21 is vertically arranged at an excavation control line, a steel pipe diagonal bracing 22 is arranged between the inner side of the single-sided wood template support 21 and the cushion layer 1, and then concrete backfilling is carried out between the outer side of the single-sided wood template support 21 and a side slope to form a bottom retaining wall;

setting a single-sided wood formwork support 21 vertically at an excavation control line when the bedding layer 1 with the substrate height difference being larger than 2m is constructed, setting a steel pipe diagonal brace 22 between the inner side of the single-sided wood formwork support 21 and the bedding layer 1, setting a top layer retaining wall reinforcing steel bar 23 at the outer side of the single-sided wood formwork support 21, backfilling concrete between the outer side of the single-sided wood formwork support 21 and the earthwork to form a bottom layer retaining wall, setting a double-sided wood formwork support 24 on the top layer retaining wall reinforcing steel bar 23 extending out of the bottom layer retaining wall, setting a steel pipe diagonal brace 25 between one side of the double-sided wood formwork support 24 and a side slope, setting the steel pipe diagonal brace 22 between one side of the double-sided wood formwork support 24 and the bedding layer 1, pouring concrete into the double-sided wood formwork support 24 to form a top layer retaining wall, and backfilling between the top layer retaining wall and the side slope after the double-sided wood formwork support and the steel pipe support are removed;

thirdly, arranging concrete cushion blocks 31 on the inner bottom surface of the raft foundation in a matrix distribution manner, arranging longitudinal and transverse lower layer steel bars 32 on the concrete cushion blocks 31, binding, welding bottom brackets 33 corresponding to concrete on the lower layer steel bars 32 in a distribution manner, arranging steel pipe upright posts 34 at the upper ends of the bottom brackets 33, arranging one or more layers of spaced steel pipe cross beams 35 and corresponding binding middle layer steel bars 36 in the middle of the steel pipe upright posts 34, arranging one layer of steel pipe cross beams 35 and corresponding binding upper layer steel bars 37 at the top of the steel pipe upright posts 34, and forming the raft steel bar steel pipe support frame, so that the steel bar consumption is greatly reduced, and meanwhile, the support frame is ensured to have enough structural strength.

And fourthly, firstly, performing concrete pouring on the pits in the inner pits of the raft foundation to form a first concrete pouring area 41, and then performing concrete pouring on the pits on the upper part in the raft foundation to form a second concrete pouring area 42, so that the layered forming of the raft foundation pouring is completed, and the pouring construction is smoother.

Referring to fig. 1-3, in the first and second steps, short steel bars 26 for fixedly connecting the steel pipe diagonal braces 22 are pre-buried on the cushion layer 1 at intervals, so that construction is facilitated.

Referring to fig. 1 to 3, in the first and second steps, the steel pipe diagonal braces 22 connected to the single-sided wood form support 21 are two, and the steel pipe diagonal braces 22 and the steel pipe diagonal braces 25 connected to the double-sided wood form support 24 are five, respectively, so that the single-sided wood form support 21 and the double-sided wood form support 24 are firmly fixed.

Referring to fig. 3, in an exemplary second step, the double-sided wood formwork support 24 includes a red formwork, a wood beam vertical edge, a double-steel-pipe transverse edge and a high-strength opposite wire-drawing rod, preferably, the red formwork is 13mm to 18mm thick, the wood beam vertical edge is distributed at a horizontal distance of 300mm, the double-steel-pipe transverse edge is spaced at a horizontal distance of 500mm, and the high-strength opposite wire-drawing rod is ensured to construct and structurally strengthen the top-layer retaining wall.

Referring to fig. 6, in the third step, the shoe 33 is shaped like a letter "earth", the shoe 33 is spot-welded to the lower layer steel bar 32, and the lower end of the steel pipe column 34 is sleeved on the upper end of the shoe 33, so that the shoe 33 is firmly fixed and the steel pipe column 34 is firmly supported.

In the third step, the steel pipe column 34 is fastened to the steel pipe beam 35 through a fastener, and the steel pipe column 34, the steel pipe beam 35 and the fastener are subjected to oil and rust removal treatment, so that the structure is durable and the strength is firm.

In the fourth step, a water stop steel plate is arranged on the periphery of the inner side wall of the raft foundation, so that later-stage water seepage of the raft construction joint is effectively prevented.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (7)

1. The utility model provides a big thickness variable cross section raft foundation structure which characterized in that: including barricade and raft bar steel pipe support frame, the barricade sets up at the periphery of raft foundation around the ground, the barricade includes by lower supreme fashioned bottom layer barricade and top layer barricade, raft bar steel pipe support frame includes concrete pad piece, lower floor's reinforcing bar, collet, steel pipe stand, steel pipe crossbeam, middle level reinforcing bar and upper reinforcing bar, concrete pad piece is followed the matrix and is distributed on the inner bottom of raft foundation, lower floor's reinforcing bar is connected with crisscross the distribution of matrix on the concrete pad piece, the collet is connected with along the matrix on the lower floor's reinforcing bar, every connect one on the collet steel pipe stand, steel pipe crossbeam and the middle level reinforcing bar of one deck or more are connected to the middle part of steel pipe stand, the top of steel pipe stand is connected with one deck steel pipe crossbeam and upper reinforcing bar.

2. The high thickness variable cross-section raft foundation structure of claim 1, wherein: the bottom support is shaped like a Chinese character 'tu', the bottom support is connected with the lower layer steel bars in a spot welding mode, and the lower ends of the steel pipe stand columns are sleeved with the upper ends of the bottom support.

3. The high thickness variable cross-section raft foundation structure of claim 1, wherein: the shoe is made of steel pipes with diameters greater than or equal to 28mm, and the height of the shoe is 260-360 mm.

4. The high thickness variable cross-section raft foundation structure of claim 1, wherein: the middle layer steel bars and the upper layer steel bars are respectively connected to the upper side of the steel pipe beam through binding.

5. The high thickness variable cross-section raft foundation structure of claim 1, wherein: the steel pipe column is buckled with the steel pipe cross beam through a fastener.

6. The high thickness variable cross-section raft foundation structure of claim 1, wherein: the bottom layer retaining wall is made of concrete backfill between an earth side slope and a single-sided wood template support, and the top layer retaining wall is made of cast concrete in the double-sided wood template support.

7. The high thickness variable cross-section raft foundation structure of claim 1, wherein: the raft foundation inside wall is provided with the stagnant water steel sheet.

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