CN212129154U - Prefabricated assembled steel and concrete combined support's underground structure - Google Patents
Prefabricated assembled steel and concrete combined support's underground structure Download PDFInfo
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- CN212129154U CN212129154U CN202020086355.8U CN202020086355U CN212129154U CN 212129154 U CN212129154 U CN 212129154U CN 202020086355 U CN202020086355 U CN 202020086355U CN 212129154 U CN212129154 U CN 212129154U
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Abstract
The utility model discloses a prefabricated assembled steel and concrete combination support's excavation supporting construction, including the prefabricated reinforced concrete board that is equipped with recess and tooth and reserves the bolt hole, be equipped with the prefabricated girder steel that reserves the bolt hole, connect the high strength bolt of prefabricated reinforced concrete board and prefabricated girder steel, the steel stand that vertical direction was squeezed into is followed to the excavation front side and rear side, sets up the steel corbel on the steel stand outer wall, sets up the steel waist rail on the steel stand steel corbel, encloses the steel of wall body round around the excavation and encloses the purlin to and place the hydraulic jack between the vertical board of angle steel and steel enclosure purlin. The utility model discloses combined the advantage that steel shotcrete and reinforced concrete supported, it is big to have rigidity, and the dead weight is light, easy to assemble and dismantlement, but reuse to accessible jack exerts precompression and plays supporting role and adjustable supporting power size, and the reduction of erection time reduces the advantage of cost.
Description
Technical Field
The utility model relates to a supporting construction of foundation ditch and structure of building thereof, concretely relates to a structure that is used for excavation supporting's prefabricated assembled steel-concrete combination to support.
Background
The foundation pit support is a measure for temporarily retaining, reinforcing, protecting and controlling underground water adopted by the foundation pit in order to protect the construction of an underground main body structure and the surrounding environment of the foundation pit.
The common deep foundation pit supporting structure types include cantilever type supporting, soil nailing wall supporting, inner support supporting, anchor pulling type supporting, cement soil gravity type supporting wall, underground continuous wall and combined supporting. The cantilever type support has the defects of poor water stopping capability, long construction period, sensitivity to excavation depth, easy generation of larger deformation and the like. The soil nailing wall support has the defects of long construction period, inapplicability to regions with poor soil property and the like. The anchor pulling type support is only suitable for the environment and geological conditions of pulling in the surrounding field, and has large limitation. The cement soil gravity type supporting wall has the defects of large occupied space, large deformation of the enclosure wall structure and large influence on the adjacent environment. The underground diaphragm wall is difficult to construct under some special geological conditions, the phenomena of misalignment and water leakage of adjacent wall sections can occur, the cost is high, and the waste slurry treatment is troublesome.
The inner support has the advantages of directly balancing the pressure of soil and water on the retaining walls at the two ends, simple structure, definite stress and capability of effectively controlling the deformation of the foundation pit, is very wide in application, is suitable for deep foundation pit engineering of various soil layers and depths, and is particularly suitable for the conditions of large foundation pit area and deep excavation depth in complex soil and soft soil areas. The common internal support supporting structure can be structurally divided into a single-layer or multi-layer plane supporting system and a vertical inclined strut system; distinguished from the type of support member, it can be classified into a cast-in-place reinforced concrete support system and a steel support system. The traditional reinforced concrete support system has the advantages of high rigidity, good compression resistance, larger bearing capacity, flexible shape, capability of being used as a trestle, capability of accelerating the excavation and transportation speed of the earthwork, low manufacturing cost and no limitation of the shortage of peripheral fields; but simultaneously, the reinforced concrete support system has the defects of great weight, long test piece manufacturing and maintenance, incapability of immediately playing a supporting role after manufacturing, difficulty in material recovery, harm to the environment and the like. For a steel support system, the steel support system has the advantages of light dead weight, high construction speed, convenience and quickness in construction, no need of maintenance, low support cost, recycling, environmental protection and the like; but simultaneously, compared with the reinforced concrete support, the steel structure support has the defects of small rigidity and easy instability.
Therefore, in the case where the span of the foundation pit is relatively large, in order to prevent buckling of the steel shotcrete, a steel-concrete composite beam in which a steel beam is combined with a reinforced concrete member cast in place may be used as the supporting member. In this case, the steel beam and the cast-in-place reinforced concrete member are combined by welding studs as shear connectors. However, the steel-concrete composite girder as a supporting member requires a long time for casting concrete in situ, like the reinforced concrete supporting member. In addition, when the support is dismantled after the foundation pit supporting engineering is finished, not only can great vibration and noise be generated, but also the dismantling period is long. From the perspective of material recycling, in the combined beam support, because the steel beam and the cast-in-place reinforced concrete part are combined into a whole through the welding studs, the steel beam cannot be effectively recycled during dismantling and can only be discarded, and the treatment cost of construction waste is increased.
Disclosure of Invention
An object of the utility model is to overcome prior art's shortcoming, provide a rigidity big, the dead weight is light, the installation with demolish convenient, construction speed is fast, can reuse, the foundation ditch supporting construction that prefabricated steel-thoughtlessly mix concrete combined support that holding power can be adjusted.
In order to achieve the above object, the utility model discloses a technical scheme specifically as follows:
the utility model discloses a prefabricated assembled steel and concrete combined supporting's foundation ditch supporting construction, including the round steel purlin that encloses that sets up along the enclosure wall body of foundation ditch, squeeze into front-seat steel stand and back-seat steel stand along the vertical direction respectively in front side and rear side in the foundation ditch, front-seat steel stand and back-seat steel stand respectively include the many steel stands that control the interval and set up; a steel corbel with an I-shaped steel structure is welded on the outer wall of each steel upright along the same height; the front and the rear steel waist beams are respectively fixed on the upper flange plates of the steel brackets of the front row of steel upright columns and the upper flange plates of the steel brackets of the rear row of steel upright columns through high-strength bolts;
a plurality of groups of steel-concrete combined supporting structures are respectively arranged on the front steel waist beam and the rear steel waist beam at intervals from left to right, each group of steel-concrete combined supporting structures comprises two steel brackets welded on the steel purlin at the position between every two rear rows of steel upright columns adjacent to the left and the right at intervals from left to right, and the position of each steel bracket is consistent with the rear end position of a prefabricated steel beam to be arranged on the steel waist beam; the rear ends of a plurality of prefabricated steel beams are respectively supported and welded on the steel bracket in a one-to-one correspondence mode, inclined supports are respectively welded between the left side and the right side of a lower flange plate of the prefabricated steel beam and the surrounding purlin, the front end of each prefabricated steel beam is respectively connected with a vertical plate of an angle steel through a high-strength bolt, a horizontal plate of the angle steel is connected with the steel surrounding purlin in a welding mode, and the plurality of prefabricated steel beams are perpendicular to the steel waist beam; the prefabricated concrete plate comprises a rectangular body, grooves and convex teeth are alternately arranged on the front side and the rear side of the rectangular body in the left-right direction, concrete plate reserved through holes are formed in the four corners of the rectangular body in the vertical direction, longitudinal steel bars and transverse steel bars are arranged in the body, and the prefabricated concrete plate is fixedly connected with the prefabricated steel beams through high-strength bolts penetrating through the concrete plate reserved through holes and bolt holes in the prefabricated steel beam upper flange plates; the groove and the convex tooth between the two adjacent precast concrete plates on the left and the right are connected in a mortise and tenon way; pouring shrinkage-free high-strength mortar in the reserved through hole of the concrete plate; a hydraulic jack is arranged between the vertical plate of each angle steel and the steel enclosing purlin, and a push rod of the hydraulic jack can be in contact with the angle steel along the horizontal direction.
The utility model has the advantages that: 1) the combined support is formed by combining precast concrete blocks and steel beams, is convenient to install and dismantle, has high construction speed and can be repeatedly used; 2) the combined support has high rigidity and light dead weight and has the function of a trestle; 3) the pre-pressure is applied by the jack to play a supporting role and the size of the supporting force can be adjusted.
Drawings
Fig. 1 is a precast concrete plate of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the utility model;
fig. 2 is a reinforced plan view of a precast concrete plate of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the utility model;
fig. 3 is a sectional view of a precast concrete slab of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the utility model;
fig. 4 is a schematic structural view of a prefabricated steel beam with reserved bolt holes of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the utility model;
fig. 5 is a schematic structural view of a prefabricated steel beam of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the utility model;
fig. 6 is a schematic view of the connection between the precast steel beam and the precast concrete slab of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 7 is a schematic view of the connection between the precast steel beam and the precast concrete slab of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 8(a) is a bolt connection diagram of a prefabricated steel beam and a prefabricated concrete plate of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 8(b) is a nut connection diagram of a prefabricated steel beam and a prefabricated concrete plate of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 8(c) is a grouting diagram of the preformed holes of the precast steel beams and the precast concrete plates of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 9 is a schematic cross-sectional view of a prefabricated assembled steel-concrete composite support according to the present invention;
fig. 10(a) is a front view of a column arrangement of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 10(b) is a front view of the arrangement of the steel waist beam of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 10(c) is a front view of the arrangement of the prefabricated steel beams of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 10(d) is a front view of a precast concrete slab layout of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 10(e) is a finished front view of the prefabricated concrete plate arrangement of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 11(a) is a schematic diagram of an arrangement structure of steel columns and steel waist beams of a prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 11(b) is a schematic view of the prefabricated steel beam layout structure of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 11(c) is a schematic diagram of the arrangement structure of precast concrete slabs of the prefabricated assembly type steel-concrete combined supporting foundation pit supporting structure of the present invention;
fig. 12 is the utility model discloses a prefabricated assembled steel and concrete combination support's underground structure's top view.
Detailed Description
The invention is explained in more detail below by means of specific examples.
The utility model discloses a prefabricated assembled steel-concrete combined supporting's foundation pit supporting construction, as shown in the attached drawing, including the round steel purlin 10 that sets up along the enclosure wall body of foundation pit, squeeze into front steel stand and back steel stand 8 of row before and behind in the foundation pit along the vertical direction respectively, front steel stand and back steel stand 8 of row include respectively about many steel stands that the interval set up; preferably, the distance between two steel stand 8 about in the many steel stand of front row and the many steel stand of back row is 6 ~ 9m, and the distance between two steel stand 8 that correspond the setting each other in front and back is 6 ~ 9m, and structural design is reasonable like this, and the plane layout is reasonable, convenient construction.
A steel corbel 9 with an I-shaped steel structure is welded on the outer wall of each steel upright 8 along the same height;
the front and rear steel wales 11 are respectively fixed on the upper flange plates of the steel brackets 9 of the front row of steel columns 8 and the upper flange plates of the steel brackets 9 of the rear row of steel columns 8 through high-strength bolts, wherein the high-strength bolts refer to bolts with performance grade above 8.8, and refer to fig. 10(b) and fig. 11 (a);
a plurality of groups of steel-concrete combined supporting structures are respectively installed on the front and the rear steel waist beams 11 at intervals from left to right, and the top view of the steel-concrete combined supporting structures is shown in fig. 12; each group of steel-concrete combined supporting structure comprises two steel brackets 12 welded on a steel purlin 10 at the position between every two rear rows of adjacent steel upright posts 8 at left and right intervals, and the position of each steel bracket 12 is consistent with the rear end position of a prefabricated steel beam 7 to be installed on a steel waist beam; the rear ends of a plurality of prefabricated steel beams 7 are respectively in one-to-one correspondence and are supported and welded on the steel bracket 12, inclined supports 13 are respectively welded between the left side and the right side of a lower flange plate of the prefabricated steel beam and the surrounding purlin 10, the front end of each prefabricated steel beam is respectively connected with a vertical plate of an angle steel 14 through a high-strength bolt, and a horizontal plate of the angle steel 14 is connected with the steel surrounding purlin 10 in a welding mode. The plurality of prefabricated steel beams 7 are perpendicular to the steel waist beam; the prefabricated concrete block 15 is continuously installed on two prefabricated steel beams 7 between every two left and right adjacent rear rows of two steel columns 8 and between every two left and right adjacent front rows of two steel columns 8 from left to right, the left end and the right end of the prefabricated concrete block 15 are respectively supported on upper flange plates of the two prefabricated steel beams 7, referring to fig. 1, the prefabricated concrete block 15 comprises a rectangular body, grooves 2 and convex teeth 3 are respectively and alternately arranged on the front side and the rear side of the rectangular body from left to right, concrete block reserved through holes 1 are respectively formed in four corners of the rectangular body along the vertical direction, referring to fig. 2, longitudinal steel bars and transverse steel bars are arranged in the body. The precast concrete plate 15 is fixedly connected with the precast steel beam 7 through a high-strength bolt which penetrates through the reserved through hole 1 of the precast concrete plate and the bolt hole 6 on the flange plate of the precast steel beam 7; the groove 2 and the convex tooth 3 between two adjacent precast concrete plates 15 on the left and right are connected in a mortise and tenon way; pouring shrinkage-free high-strength mortar in the reserved through hole 1 of the concrete plate; a hydraulic jack 16 is arranged between the vertical plate of each angle steel 14 and the steel purlin 10, a push rod of the hydraulic jack 16 can be in contact with the angle steel 14 along the horizontal direction, and pressure is uniformly loaded on the precast steel beam 7 and the precast concrete plate 15 through the angle steel 14.
The supporting method of the structure comprises the following steps:
step one, referring to fig. 10(a), a circle of steel purlin 10 is arranged along a retaining wall of a foundation pit, a front row of steel columns and a rear row of steel columns 8 are respectively driven into the front side and the rear side of the foundation pit along the vertical direction, and the front row of steel columns and the rear row of steel columns 8 respectively comprise a plurality of steel columns which are arranged at intervals left and right; preferably, the distance between two steel stand 8 about in the many steel stand of front row and the many steel stand of back row is 6 ~ 9m, and the distance between two steel stand 8 that correspond the setting each other in front and back is 6 ~ 9m, and structural design is reasonable like this, and the plane layout is reasonable, convenient construction.
Step two, welding a steel corbel 9 with an I-shaped steel structure on the outer wall of each steel upright 8 along the same height;
thirdly, fixing the front and rear steel wales 11 on the upper flange plates of the steel brackets 9 of the front row of steel columns 8 and the upper flange plates of the steel brackets 9 of the rear row of steel columns 8 respectively through high-strength bolts, wherein the high-strength bolts refer to bolts with the performance grade above 8.8 grade, and refer to fig. 10(b) and fig. 11 (a);
fourthly, a plurality of groups of steel-concrete combined supporting structures are respectively arranged on the front steel waist beam 11 and the rear steel waist beam 11 at intervals left and right, and the top view of the steel-concrete combined supporting structures is shown in figure 12; the mounting method of each group of steel-concrete combined support is as follows:
firstly, welding two steel brackets 12 on a steel purlin 10 between every two left and right adjacent rear row steel upright posts 8 at intervals left and right respectively, wherein the position of each steel bracket 12 is consistent with the rear end position of a prefabricated steel beam 7 to be installed on a steel waist beam;
and secondly, referring to fig. 10(c), the rear ends of a plurality of prefabricated steel beams 7 are respectively welded on the steel bracket 12 in a one-to-one corresponding supporting mode, inclined supports 13 are respectively welded between the left side and the right side of a lower flange plate of the prefabricated steel beams and the surrounding purlin 10, the front end of each prefabricated steel beam is respectively connected with a vertical plate of an angle steel 14 through a high-strength bolt, and then a horizontal plate of the angle steel 14 is connected with the steel surrounding purlin 10 in a welding mode. The plurality of prefabricated steel beams 7 are perpendicular to the steel waist beam and penetrate through the steel waist beam;
thirdly, referring to fig. 3, 6, 7, 10(d) and 10(e), a precast concrete slab 15 is placed on one side of two precast steel beams 7 between every two rear steel columns 8 adjacent to each other left and right and between every two front steel columns 8 adjacent to each other left and right, the left and right ends of the precast concrete slab 15 are respectively supported on the upper flange plates of the two precast steel beams 7, referring to fig. 1, the precast concrete slab 15 comprises a rectangular body, grooves 2 and convex teeth 3 are respectively and alternately arranged on the left and right sides of the rectangular body, concrete slab reserved through holes 1 are respectively formed in the four corners of the rectangular body along the vertical direction, and referring to fig. 2, longitudinal steel bars and transverse steel bars are arranged in the body.
Fourthly, fixedly connecting the precast concrete plate 15 through a high-strength bolt penetrating through the reserved through hole 1 of the concrete plate and the bolt hole 6 on the flange plate of the precast steel beam 7;
and fifthly, repeating the third step and the fourth step, and continuously fixing the precast concrete plates 15 on the upper flange plates of the two precast steel beams 7 from left to right until all the precast concrete plates 15 are installed on the upper flange plates 4 of the precast steel beams, which is shown in fig. 7 and 11 (c). The groove 2 and the convex tooth 3 between two adjacent precast concrete plates 15 on the left and right are connected in a mortise and tenon manner;
sixthly, pouring non-shrinkage high-strength mortar (the high-strength mortar refers to a composite material consisting of high-strength cement, mineral admixture, cement superplasticizer, aggregate and other functional additives) in the reserved through holes 1 of the concrete plate;
and step five, referring to fig. 10(e) and fig. 12, a hydraulic jack 16 is arranged between the vertical plate of each angle steel 14 and the steel purlin 10, and the hydraulic jack 16 uniformly loads pressure on the precast steel beam 7 and the precast concrete slab 15 through the angle steel 14.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above examples, and that the foregoing examples and descriptions are illustrative only, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and the invention is intended to be limited only to the details shown and described herein. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. Prefabricated assembled steel and concrete combined support's excavation supporting construction, its characterized in that: the steel column retaining structure comprises a circle of steel purlin arranged along a retaining wall of a foundation pit, a front row of steel columns and a rear row of steel columns are driven into the front side and the rear side in the foundation pit respectively along the vertical direction, and the front row of steel columns and the rear row of steel columns respectively comprise a plurality of steel columns arranged at intervals left and right; a steel corbel with an I-shaped steel structure is welded on the outer wall of each steel upright along the same height; the front and the rear steel waist beams are respectively fixed on the upper flange plates of the steel brackets of the front row of steel upright columns and the upper flange plates of the steel brackets of the rear row of steel upright columns through high-strength bolts;
a plurality of groups of steel-concrete combined supporting structures are respectively arranged on the front steel waist beam and the rear steel waist beam at intervals from left to right, each group of steel-concrete combined supporting structures comprises two steel brackets welded on the steel purlin at the position between every two rear rows of steel upright columns adjacent to the left and the right at intervals from left to right, and the position of each steel bracket is consistent with the rear end position of a prefabricated steel beam to be arranged on the steel waist beam; the rear ends of a plurality of prefabricated steel beams are respectively supported and welded on the steel bracket in a one-to-one correspondence mode, inclined supports are respectively welded between the left side and the right side of a lower flange plate of the prefabricated steel beam and the surrounding purlin, the front end of each prefabricated steel beam is respectively connected with a vertical plate of an angle steel through a high-strength bolt, a horizontal plate of the angle steel is connected with the steel surrounding purlin in a welding mode, and the plurality of prefabricated steel beams are perpendicular to the steel waist beam; the prefabricated concrete plate comprises a rectangular body, grooves and convex teeth are alternately arranged on the front side and the rear side of the rectangular body in the left-right direction, concrete plate reserved through holes are formed in the four corners of the rectangular body in the vertical direction, longitudinal steel bars and transverse steel bars are arranged in the body, and the prefabricated concrete plate is fixedly connected with the prefabricated steel beams through high-strength bolts penetrating through the concrete plate reserved through holes and bolt holes in the prefabricated steel beam upper flange plates; the groove and the convex tooth between the two adjacent precast concrete plates on the left and the right are connected in a mortise and tenon way; pouring shrinkage-free high-strength mortar in the reserved through hole of the concrete plate; a hydraulic jack is arranged between the vertical plate of each angle steel and the steel enclosing purlin, and a push rod of the hydraulic jack can be in contact with the angle steel along the horizontal direction.
2. The prefabricated assembled steel-concrete composite supported foundation pit supporting structure according to claim 1, wherein: the distance between two steel stand columns on the left and right in the many steel stand columns of front row and the back row is 6 ~ 9m, and the distance between two steel stand columns that set up each other front and back is 6 ~ 9 m.
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| CN202020086355.8U CN212129154U (en) | 2020-01-15 | 2020-01-15 | Prefabricated assembled steel and concrete combined support's underground structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062326A (en) * | 2021-03-16 | 2021-07-02 | 上海市城市建设设计研究总院（集团）有限公司 | Foundation pit reinforced concrete inner support system and construction method for rapid installation of foundation pit reinforced concrete inner support system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062326A (en) * | 2021-03-16 | 2021-07-02 | 上海市城市建设设计研究总院（集团）有限公司 | Foundation pit reinforced concrete inner support system and construction method for rapid installation of foundation pit reinforced concrete inner support system |
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