CN116201132A - Main support applied to foundation pit engineering - Google Patents
Main support applied to foundation pit engineering Download PDFInfo
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- CN116201132A CN116201132A CN202211445218.9A CN202211445218A CN116201132A CN 116201132 A CN116201132 A CN 116201132A CN 202211445218 A CN202211445218 A CN 202211445218A CN 116201132 A CN116201132 A CN 116201132A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention relates to the technical field of foundation pit engineering, and discloses a main support applied to foundation pit engineering, which comprises a main support, a tie bar, a diagonal brace, an enclosing purlin and a pressurizing assembly; the main supports are provided with a plurality of main supports, the main supports are arranged in parallel, and the tie bars are arranged on the upper side and the lower side between two adjacent main supports; the two ends of the diagonal braces are respectively connected with the intersection points of two adjacent sectional materials and the tie rod in a diagonal manner, the diagonal braces are arranged in pairs, and the diagonal braces arranged in pairs are mutually intersected; the enclosing purlin is arranged at the top and the inner side of the middle of the retaining wall body; the enclosing purlin is directly connected with the main support or connected with the pressurizing assembly; the number of supports can be flexibly adjusted, the distance between supports can be flexibly adjusted, and the recycling rate of the section bars can be flexibly improved.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to the technical field of foundation pit engineering, and particularly relates to a main support applied to foundation pit engineering.
Background
In the underground structure engineering, special foundation pit enclosure construction is needed to meet construction excavation conditions and control surrounding environment deformation, wherein part of foundation pit enclosure engineering adopts a plate type support system, namely, a cast-in-place pile, a steel pile, an underground continuous wall and other retaining walls are arranged around a foundation pit, an in-pit support system is needed to be arranged on the inner side of the retaining wall in the foundation pit and used as a counterforce fulcrum on the inner side of the retaining wall for balancing soil pressure on the outer side of the retaining wall, and the support system generally adopts a steel support or reinforced concrete support.
The steel support has the advantages of high installation speed, convenient construction, recycling and reuse, balanced loading, control of foundation pit deformation, low cost and the like, and is widely applied to foundation pit engineering. The steel support commonly used in foundation pit engineering has forms such as concatenation combination shaped steel support, concatenation combination steel pipe support, welding shaped steel support, when single steel support member is insufficient to bear the soil pressure around the foundation pit, needs many steel members to make up the use, can adopt different connection combination modes when many steel members make up, but the following problem generally exists: after the specification of the standard combined steel supporting member is determined, the supporting quantity is difficult to flexibly adjust; after the connection of the tie bar standard components is determined, the support distance is difficult to flexibly adjust; and the recovery rate of the welded profile steel support is low.
Therefore, it is necessary to provide a main support for foundation pit engineering to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a main support applied to foundation pit engineering, which is used for solving the problem that the number of supports is difficult to flexibly adjust after the specification of standard combination steel support members in the background technology is determined; after the connection of the tie bar standard components is determined, the support distance is difficult to flexibly adjust; and the recovery rate of the welded profile steel support is low.
In order to achieve the above purpose, the main support applied to foundation pit engineering is designed, the number of the supports can be flexibly adjusted, the distance between the supports can be flexibly adjusted, and the recycling rate of the section bars can be provided.
Based on the thought, the invention provides the following technical scheme:
a main support applied to foundation pit engineering comprises a main support 1, a tie bar 2, a diagonal brace 3, an enclosing purlin 4 and a pressurizing assembly;
the main support 1 is provided with a plurality of main supports 1, the main supports 1 are mutually arranged in parallel, the tie bars 2 are arranged on the upper side and the lower side between two adjacent main supports 1, hot-rolled T-shaped steel is adopted, the flanges of the tie bars are provided with bolt connecting holes for connecting with the main supports 1, when the foundation pit span is smaller, the tie bars can be independently used by a single foundation pit, and when the foundation pit span is larger, the tie bars are arranged in parallel in groups of two or more than two;
the two ends of the diagonal brace 3 are respectively and diagonally connected with the intersection points of the two adjacent sectional materials 101 and the tie bars 2, the diagonal braces 3 are arranged in pairs, the diagonal braces 3 arranged in pairs are intersected with each other, and the diagonal braces 3 are mainly used for restraining supporting deformation when the main brace 1 has a transverse deformation trend, so that the integral stability of the whole supporting system is ensured; the diagonal braces can be in cross section forms such as round steel, reinforcing steel bars, steel pipes and section steel, the ends of the diagonal braces are directly connected with the tie bars 2, welding, bolt connection, pin connection and the like can be adopted, a group of tie bars 2 and two main braces 1 where the diagonal braces 3 are positioned at the intersection points form a truss type supporting system, the horizontal stability of the whole supporting system can be ensured, and when more main braces 1 are arranged and are connected with the tie bars 2, the supporting system is still a stable system, so that only one group of diagonal braces 3 are needed to be arranged for the plurality of main braces 1, and the system is simple and efficient;
the enclosing purlin 4 is arranged at the top and the inner side of the middle of the retaining wall body, is connected with the retaining wall body such as a cast-in-place pile, a section steel pile, an underground continuous wall and the like, and is a member for transmitting the soil pressure outside the enclosing retaining wall body to a supporting system in a foundation pit supporting system, and is commonly used in two forms of reinforced concrete enclosing purlins and steel enclosing purlins;
the enclosing purlin 4 is directly connected with the main support 1 or connected with the pressurizing assembly.
Preferably, the main stay 1 comprises a profile 101 and an end plate 102;
the two ends of the section bar 101 are fixedly connected with the end plates 102, the end plates 102 are used for lengthening connection between the two main supports 1, the section bar 101 adopts hot rolled H-shaped steel, and groups of bolt connection holes are formed in the upper flange and the lower flange and are used for being connected with the tie bars 2; when the length of a single main support 1 is insufficient, splicing and lengthening are needed, an end plate 102 is arranged at the end part of a section bar 101, the end plate 102 is welded with the section bar 101, and bolt connecting holes are formed in the end plate 102 and used for lengthening and connecting two sections of main supports 1.
Preferably, the pressurizing assembly comprises a pressurizing beam 5, a pressurizing cushion block 6, a backing plate 7 and a jack 8;
the pressurizing beam 5 is arranged at one ends of the main supports 1, one side of the pressurizing beam 5 is connected with the main supports 1, the other side of the pressurizing beam 5 is connected with the pressurizing cushion blocks 6, the pressurizing cushion blocks 6 are provided with a plurality of pressurizing cushion blocks, a plurality of setting spaces for the jacks 8 are reserved among the pressurizing cushion blocks 6, the jacks 8 can be arranged among the pressurizing cushion blocks 6, and the pressurizing beam 5 transmits the pressure of the jacks 8 to the main supports 1 in a shoulder pole beam mode. The pressurizing beam 5 is formed by welding profile steel and a steel plate, and bolt connecting holes are formed in the connecting positions of the two sides of the pressurizing beam and the main support 1 and the pressurizing cushion block 6; when the supporting system is pressed to generate shrinkage deformation, the total length reduction of the supporting system can be fully or partially compensated by the jacking action of the jack 8, the enclosing purlin 4 is pushed towards the outer direction of the foundation pit, the deformation of the foundation pit is counteracted or reduced, and the deformation of the external environment of the foundation pit is controlled.
Preferably, the pressurizing cushion block 6 is arranged between the pressurizing beam 5 and the enclosing purlin 4 and aligned with the axis of the main support 1, the pressurizing cushion block 6 is a pressurizing member, the pressurizing cushion block 6 is fixedly connected with the enclosing purlin 4, the pressurizing cushion block 6 and the pressurizing beam 5 can be separated, and the pressurizing cushion block 6 is propped against the pressurizing beam 5.
Preferably, the pad 7 is used for transferring force and adjusting size, after the jack 8 is pressed to jack up a certain distance between the pressure beam 5 and the enclosing purlin 4, one or more layers of the pad 7 are inserted between the pressure beam 5 and the pressure cushion block 6, and after the jack 8 is loosened, the pressure beam 5, the pad 7 and the pressure cushion block 6 are again jacked up for maintaining pressure and transferring force reliably.
Preferably, the structure further comprises a node plate 9, a bearing plate 10 and a rib plate 11, wherein the node plate 9 is arranged at a node of the connecting position of the tie bar 2 and the diagonal brace 3, the node plate 9 is fixedly connected with the tie bar 2, the outer end face of the node plate 9 is vertically and fixedly connected with the bearing plate 10, the end part of the diagonal brace 3 is fixedly connected with the end face of the bearing plate 10, the bearing plate 10 is fixedly arranged on two sides of the diagonal brace 3, the rib plate 11 is fixedly arranged on the two sides of the diagonal brace 3, the node plate 9 can be connected with the tie bar 2 through a reserved point on the tie bar 2 through bolts, and the main bracing structure is tighter and can bear larger pressure through the arrangement of the bearing plate 10 at two ends of the diagonal brace 3.
Preferably, the device 12 is added to the backing plate includes fixed column 1201, spliced pole 1202 and roof 1203, spliced pole 1202 is fixed to be set up the upside of fixed column 1201, spliced pole 1202's up end with pressurization roof beam 5 sliding connection, the one end of roof 1203 with pressurization roof beam 5's up end fixed connection, the lower terminal surface of roof 1203 with pressurization cushion 6's up end sliding connection when pressurization roof beam 5 is not by jack 8 is jacked up, pressurization roof beam 5 with do not produce the clearance between the pressurization cushion 6, just roof 1203 with spliced pole 1202 aligns in vertical direction.
Preferably, the pad adding device 12 further includes a spring expansion rod 1206 and a clamping block 1207, the fixing column 1201 and the connecting column 1202 are hollow and are mutually communicated, a plurality of spring expansion rods 1206 are arranged at the bottom of the fixing column 1201, the clamping block 1207 is fixedly arranged at the upper side of the spring expansion rods 1206, chamfers are respectively arranged at two sides of the pad 7, the chamfers at the lower end of the pad 7 are matched with the shape of the clamping block 1207, and the lower end face of the pad 7 is clamped by the clamping block 1207.
Preferably, the pad adding device 12 further includes a fixing ring 1205, a strip hole 1208 and a fixing plate 2010, a plurality of fixing plates 1210 are fixedly disposed on a lower end surface of the top plate 1203, the fixing ring 1205 is fixedly disposed on a lower end surface of the fixing plate 1210, the fixing ring 1205 is made of elastic metal, an oblique fracture is disposed on a lower side of the fixing ring 1205, and a strip hole 1208 capable of being matched with the fixing ring 1205 is disposed on an upper side of the pad 7.
Preferably, when the pressure beam 5 is not lifted up by the jack 8, a plurality of the pad plates 7 are disposed inside the connection column 1202, and the spring expansion rod 1206 is in a compressed state, and the first pad plate 7 is located at a bonding position of the pressure beam 5 and the pressure pad 6.
Preferably, when the pressurizing beam 5 is pushed up by the jack 8 to generate a gap smaller than the thickness of the cushion plate 7, the cushion plate 7 can move upwards for a certain distance due to the arrangement of the chamfer and the upward acting force generated by the spring telescopic rod 1206, and the connecting structure of the main support is fastened against the gap between the pressurizing cushion block 6 and the pressurizing beam 5.
Preferably, when the pressurizing beam 5 is jacked up by the jack 8 and the pressurizing pad 6 generates a gap equal to the thickness of the pad 7, one pad 7 slides upwards in the gap by the upward force of the spring telescopic rod 1206, and when the top end of the pad 7 contacts the fixing ring 1205, firstly the oblique fracture of the fixing ring 1205 is jacked up, and then the pad 7 continues to move upwards until the bar-shaped hole 1208 is sleeved and fixed by the fixing ring 1205, at this time, the pad 7 completely fills the distance between the pressurizing beam 5 and the pressurizing pad 6 to further fasten the connection structure of the main support.
Preferably, the pad adding device 12 further includes a first chute 1204 and a second chute 1209, the first chute 1204 is disposed on an upper end surface of the pressurizing pad 6, two sides of a bottom of the top plate 1203 extend into the first chute 1204 to be slidably connected with the first chute 1204, the second chute 1209 is disposed on a bottom of the pressurizing beam 5, and two sides of an upper end of the connecting post 1202 extend into the second chute 1209 to be slidably connected with the second chute 1209.
Compared with the prior art, the invention has the beneficial effects that:
1. the supporting system can be completely recycled, has strong universality, is energy-saving and environment-friendly;
2. the supporting distance can be flexibly adjusted through the angle change between the diagonal braces, so that the applicability is strong;
3. the supporting system has simple structure, convenient installation and disassembly and high speed; the backing plate adding device is arranged between the pressurizing beam and the pressurizing cushion block, so that the supporting system structure is more convenient to install;
4. the supporting member is convenient for standardized production, and the concatenation combination is convenient.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a plan view of the present invention;
FIG. 2 is a cross-sectional view of a main stay;
FIG. 3 is a main strut end plate view;
FIG. 4 is a schematic illustration of tie bar and main brace connection;
FIG. 5 is a schematic view of the compression end of the main support;
FIG. 6 is a schematic view of the main structure of a gusset;
FIG. 7 is a schematic view of the main structure of the pad adding device;
FIG. 8 is an enlarged schematic view of the structure of FIG. 7 at A;
FIG. 9 is a schematic view of the main structure of the compression beam;
FIG. 10 is a cross-sectional view of the shim plate adding device;
FIG. 11 is a schematic view of the structure of the pad in the connecting column;
FIG. 12 is a cross-sectional view of a compression beam and a compression pad with a gap therebetween that is less than the thickness of the pad;
FIG. 13 is an enlarged schematic view of FIG. 12 at B;
FIG. 14 is an enlarged schematic view of FIG. 12 at C;
FIG. 15 is a cross-sectional view of a compression beam and a compression pad with a gap therebetween equal to the thickness of the pad;
FIG. 16 is an enlarged schematic view of FIG. 15 at D;
FIG. 17 is a schematic view of the main structure of the shim plate and the retaining ring when mated;
fig. 18 is an enlarged schematic view at E of fig. 17.
In the figure: 1. a main support; 101. a section bar; 102. an end plate; 2. tie bars; 3. a diagonal brace; 4. enclosing purlin; 5. a pressurizing beam, a pressurizing cushion block and a pressurizing support; 7. a backing plate; 8. a jack; 9. a gusset plate; 10. a pressure bearing plate; 11. rib plates; 12. the backing plate is additionally provided with a device; 1201. fixing the column; 1202. a connecting column; 1203. a top plate; 1204. a first chute; 1205. a fixing ring; 1206. a spring telescoping rod; 1207. a clamping block; 1208. a bar-shaped hole; 1209. a second chute; 1210. and a fixing plate.
Detailed Description
Embodiment one:
a main support applied to foundation pit engineering comprises a main support 1, a tie bar 2, a diagonal brace 3, an enclosing purlin 4 and a pressurizing assembly;
the main support 1 is provided with a plurality of main supports 1, the main supports 1 are mutually arranged in parallel, the tie bars 2 are arranged on the upper side and the lower side between two adjacent main supports 1, hot-rolled T-shaped steel is adopted, the flanges of the tie bars are provided with bolt connecting holes for connecting with the main supports 1, when the foundation pit span is smaller, the tie bars can be independently used by a single foundation pit, and when the foundation pit span is larger, the tie bars are arranged in parallel in groups of two or more than two;
the two ends of the diagonal brace 3 are respectively and diagonally connected with the intersection points of the two adjacent sectional materials 101 and the tie bars 2, the diagonal braces 3 are arranged in pairs, the diagonal braces 3 arranged in pairs are intersected with each other, and the diagonal braces 3 are mainly used for restraining supporting deformation when the main brace 1 has a transverse deformation trend, so that the integral stability of the whole supporting system is ensured; the diagonal braces can be in cross section forms such as round steel, reinforcing steel bars, steel pipes and section steel, the ends of the diagonal braces are directly connected with the tie bars 2, welding, bolt connection, pin connection and the like can be adopted, a group of tie bars 2 and two main braces 1 where the diagonal braces 3 are positioned at the intersection points form a truss type supporting system, the horizontal stability of the whole supporting system can be ensured, and when more main braces 1 are arranged and are connected with the tie bars 2, the supporting system is still a stable system, so that only one group of diagonal braces 3 are needed to be arranged for the plurality of main braces 1, and the system is simple and efficient;
the enclosing purlin 4 is arranged at the top and the inner side of the middle of the retaining wall body, is connected with the retaining wall body such as a cast-in-place pile, a section steel pile, an underground continuous wall and the like, and is a member for transmitting the soil pressure outside the enclosing retaining wall body to a supporting system in a foundation pit supporting system, and is commonly used in two forms of reinforced concrete enclosing purlins and steel enclosing purlins;
the enclosing purlin 4 is directly connected with the main support 1 or connected with the pressurizing assembly.
Specifically, the main stay 1 comprises a profile 101 and an end plate 102;
the two ends of the section bar 101 are fixedly connected with the end plates 102, the end plates 102 are used for lengthening connection between the two main supports 1, the section bar 101 adopts hot rolled H-shaped steel, and groups of bolt connection holes are formed in the upper flange and the lower flange and are used for being connected with the tie bars 2; when the length of a single main support 1 is insufficient, splicing and lengthening are needed, an end plate 102 is arranged at the end part of a section bar 101, the end plate 102 is welded with section steel, and bolt connecting holes are formed in the end plate 102 and used for lengthening and connecting two sections of main supports 1.
Specifically, the pressurizing assembly comprises a pressurizing beam 5, a pressurizing cushion block 6, a backing plate 7 and a jack 8;
the pressurizing beam 5 is arranged at one ends of the main supports 1, one side of the pressurizing beam 5 is connected with the main supports 1, the other side of the pressurizing beam 5 is connected with the pressurizing cushion blocks 6, the pressurizing cushion blocks 6 are provided with a plurality of pressurizing cushion blocks, a plurality of setting spaces for the jacks 8 are reserved among the pressurizing cushion blocks 6, the jacks 8 can be arranged among the pressurizing cushion blocks 6, and the pressurizing beam 5 transmits the pressure of the jacks 8 to the main supports 1 in a shoulder pole beam mode. The pressurizing beam 5 is formed by welding profile steel and steel plates, and bolt connecting holes are formed in the connecting positions of the two sides of the pressurizing beam and the main support 1; when the supporting system is pressed to generate shrinkage deformation, the total length reduction of the supporting system can be fully or partially compensated by the jacking action of the jack 8, the enclosing purlin 4 is pushed towards the outer direction of the foundation pit, the deformation of the foundation pit is counteracted or reduced, and the deformation of the external environment of the foundation pit is controlled.
Specifically, the pressurization cushion block 6 is arranged between the pressurization beam 5 and the enclosing purlin 4, the pressurization cushion block 6 is a pressurization member, the pressurization cushion block 6 is fixedly connected with the enclosing purlin 4, the pressurization cushion block 6 and the pressurization beam 5 can be separated, and the pressurization cushion block 6 jacks up the pressurization beam 5.
Specifically, the pad 7 is used for transferring force and adjusting size, after the jack 8 is pressurized to jack up a certain distance between the pressurizing beam 5 and the enclosing purlin 4, one or more layers of pad 7 are inserted between the pressurizing beam 5 and the pressurizing cushion block 6, and after the jack 8 is loosened, the pressurizing beam 5, the pad 7 and the pressurizing cushion block 6 are again jacked up, so that force is transferred reliably.
Excavating foundation pit engineering, namely excavating to the elevation of the bottom surfaces of the enclosing purlins and the steel supports, wherein the elevation is generally 1-2 m below the natural ground, firstly arranging the enclosing purlins 4 at the tops of the enclosing retaining walls, arranging a plurality of parallel main supports 1 on the inner sides of the enclosing purlins 4 on one side of the foundation pit, splicing and lengthening the main supports 1 in multiple sections when the length of the main supports 1 is insufficient, and arranging upright columns in the pits when the total length of the main supports 1 is too long to serve as middle supports of the main supports 1; the inner side of the enclosing purlin 4 at the other side of the foundation pit is provided with a pressurizing cushion block 6 which is aligned with the main support 1 and is generally connected with the enclosing purlin 4 by adopting an anchor bolt; the pressurizing beam 5 is arranged between the main support 1 and the pressurizing cushion block 6, the pressurizing beam 5 is connected with the main support 1 by bolts, and the pressurizing beam 5 and the pressurizing cushion block 6 are not fixedly connected but tightly propped against each other.
A plurality of transverse tie bars 2 are arranged among a plurality of main supports 1, the tie bars 2 are arranged in pairs on the upper side and the lower side of the main support 1, the horizontal direction is arranged at equal intervals, the local interval is adjustable, the tie bars 2 are orthogonal to the main support 1, and the tie bars 2 are fixedly connected with the main support 1 by adopting a bolt connection mode.
The diagonal brace 3 is connected with the tie rod 2, the connection point is positioned at the intersection point of the tie rod 2 and the main brace 1, the connection mode can adopt welding, bolt connection, pin connection and the like, and the connected diagonal brace 3 is in a flat or tensed state.
And a jack and a pressurizing propping rod are arranged between the enclosing purlin 4 and the pressurizing beam 5, the pressurizing propping rod is propped in stages according to the construction working condition of the foundation pit and the requirement of deformation control, and each time the jack props the pressurizing beam 5 and the enclosing purlin 4 for a certain distance, a backing plate 7 with corresponding thickness is additionally arranged between the pressurizing cushion block 6 and the pressurizing beam 5 layer by layer so as to keep the pressurizing deformation.
And continuing to excavate soil bodies below the steel supports to the pit bottom, constructing a structural bottom plate, and for general engineering, gradually dismantling the steel support system after the bottom plate reaches the design strength, wherein the process of dismantling the steel supports is opposite to the installation.
After the steel support is dismantled, foundation pit engineering construction is completed, and components such as basement structure wall columns and top plates are continuously constructed.
Embodiment two:
the section bar 101 of the main support 1 adopts hot rolled H-shaped steel of HW400X400, phi 28 bolt holes are formed on the upper flange and the lower flange in groups, M24 bolts can be matched, and the end plate 102 adopts a 20mm thick steel plate, as shown in figures 1, 2 and 3.
Wherein the tie rod 2 adopts the hot-rolled T-shaped steel of TW200X400, phi 28 bolt holes are formed on the flanges, and M24 bolts can be matched, as shown in figures 1 and 4.
Wherein, the diagonal brace 3 adopts phi 32 non-longitudinal rib twisted steel, and the end part is welded with the tie rod 2 to form a crisscross supporting pull rod.
The purlin 4 is drawn by taking reinforced concrete purlin as an example, and the cross section is 1200×700, as shown in fig. 1 and 5.
Wherein the pressurizing beam 5 and the pressurizing cushion block 6 are welded by adopting hot rolled H-shaped steel of HW400X400 and a steel plate, as shown in figure 5.
Wherein the backing plate 7 is made of a steel plate with the thickness of 20 mm.
Embodiment III:
specifically, still include gusset plate 9, bearing plate 10 and gusset 11, gusset plate 9 sets up tie rod 2 with the node department of diagonal brace 3 hookup location, gusset plate 9 with tie rod 2 fixed connection, the outer terminal surface vertical fixedly connected with of gusset plate 9 bearing plate 10, the tip fixed connection of diagonal brace 3 in bearing plate 10's terminal surface, bearing plate 10 is located diagonal brace 3's both sides are fixed to be equipped with gusset plate 11, and gusset plate 9 accessible tie rod 2 is last to reserve the point and tie rod 2 bolted connection, makes the main stay structure inseparabler through bearing plate 10 setting at diagonal brace 3 both ends, can bear bigger pressure.
Embodiment four:
referring to fig. 7 and 8, the pad adding device 12 includes a fixing column 1201, a connecting column 1202 and a top plate 1203, the bottom of the fixing column 1201 is connected to the bottom of the foundation pit, a reinforcing rib plate is disposed at the connection position between the periphery of the fixing column 1201 and the foundation pit, which strengthens the supporting force of the pressurizing beam 5 in the vertical direction, so that the main supporting structure is more fastened, the connecting column 1202 is fixedly disposed on the upper side of the fixing column 1201, the upper end surface of the connecting column 1202 is slidably connected with the pressurizing beam 5, one end of the top plate 1203 is fixedly connected with the upper end surface of the pressurizing beam 5, the lower end surface of the top plate 1203 is slidably connected with the upper end surface of the pressurizing pad 6, and the pad further includes a first chute 1204, the first chute 1204 is disposed on the upper end surface of the pressurizing pad 6, and the two sides of the bottom of the top plate 1203 extend into the first chute 1204 to slidably connect with the first chute 1204, and the guiding function during the movement of the top plate 1203 is completed through the arrangement of the first chute 1204, so that the top plate slides along the path of the first chute 1204;
referring to fig. 9, the second sliding groove 1209 is further included, the second sliding groove 1209 is disposed at the bottom of the pressure beam 5, two sides of the upper end of the connecting column 1202 extend toward the inside of the second sliding groove 1209 and are slidably connected with the second sliding groove 1209, and the guiding function on the pressure beam 5 is completed through the arrangement of the second sliding groove 1209, so that the pressure beam cannot be tilted by the jack 8.
Referring to fig. 10 and 11, when the pressure beam 5 is not pushed up by the jack 8, no gap is generated between the pressure beam 5 and the pressure pad 6, the top plate 1203 is aligned with the connection column 1202 in the vertical direction, the pad adding device 12 further includes a spring expansion rod 1206 and a clamping block 1207, the fixing column 1201 and the connection column 1202 are both hollow and are mutually communicated, a plurality of spring expansion rods 1206 are arranged at the bottom of the fixing column 1201, the clamping block 1207 is fixedly arranged at the upper side of the spring expansion rod 1206, chamfers are arranged at both sides of the pad 7, the chamfer shape of the lower end of the pad 7 is matched with the shape of the clamping block 1207, and the lower end face of the pad 7 is clamped by the clamping block 1207;
the pad adding device 12 further comprises a bar hole 1208, the bar hole 1208 is formed in the upper side of the pad 7, when the pressurizing beam 5 is not jacked up by the jack 8, the top of the pad 7 props against the bottom of the pressurizing beam 5, all the pads are arranged in the connecting column 1202, the spring telescopic rod 1206 is in a compressed state, and the first pad 7 is located at the joint position of the pressurizing beam 5 and the pressurizing pad 6.
Referring to fig. 12, 13, and 14, when the pressurizing beam 5 is pushed up by the jack 8 and the pressurizing pad 6 generates a gap smaller than the thickness of the pad 7, the pad 7 can move upwards for a certain distance due to the chamfer arrangement and the upward acting force generated by the spring expansion link 1206, and the connecting structure of the main support is fastened against the gap between the pressurizing pad 6 and the pressurizing beam 5.
Referring to fig. 15, 16, 17, 18, the pad adding device 12 further includes a fixing ring 1205 and a fixing plate 2010, a plurality of fixing plates 1210 are fixedly disposed on a lower end surface of the top plate 1203, the fixing ring 1205 is fixedly disposed on a lower end surface of the fixing plate 1210, the fixing ring 1205 is made of elastic metal, and an oblique fracture is disposed on a lower side of the fixing ring 1205;
when the pressurizing beam 5 is jacked up by the jack 8 and the pressurizing cushion block 6 generates a gap equal to the thickness of the cushion plate 7, one cushion plate 7 slides upwards in the gap by the upward acting force of the spring telescopic rod 1206, when the top end of the cushion plate 7 contacts the fixed ring 1205, firstly, the oblique fracture of the fixed ring 1205 is jacked up, then the cushion plate 7 continues to move upwards until the strip-shaped hole 1208 is sleeved and fixed by the fixed ring 1205, and at the moment, the cushion plate 7 completely fills the distance between the pressurizing beam 5 and the pressurizing cushion block 6 to further fasten the connection structure of the main support.
Example 4 principle of operation:
when the main bracing structure is installed, the fixed column 1201 is arranged at the bottom of a foundation pit, the connecting column 1202 is in sliding fit with the second sliding groove 1209 of the pressurizing beam 5, meanwhile, the bottom of the pressurizing beam 5 is propped against the base plate 7, the upward trend of the base plate 7 brought by the spring telescopic rod 1206 is restrained, the top of the pressurizing beam 5 is connected or welded with the top plate 1203 through bolts, the lower end face of the top plate 1203 extends to the upper end face of the pressurizing cushion block 6 and is in sliding connection with the upper end face of the pressurizing cushion block, then the pressurizing beam 5 is pressurized through the jack 8, the pressurizing cushion block 6 is relatively displaced, when the pressurizing beam 5 is propped up by the jack 8 and generates a gap smaller than the thickness of the base plate 7 with the pressurizing cushion block 6, the base plate 7 can move upwards by a certain distance through the arrangement of the chamfer and the spring telescopic rod 1206, the gap between the base plate 7 and the pressurizing beam 5 is propped up against the gap between the pressurizing cushion block 6 and the pressurizing beam 5, the main bracing structure is fastened, when the top of the base plate 7 is propped up by the jack 8 and the gap 7 is in contact with the fixed ring 1205, the gap between the base plate 7 is not required to be completely filled up by the gap between the pressurizing beam 7 and the pressurizing beam 7, the base plate 7 is further arranged, the gap is completely and the gap is saved by the gap between the pressurizing beam 7 and the pressurizing beam is further arranged through the gap-shaped structure and the gap-filled up gap between the pressurizing beam 7 and the pressurizing beam 5 through the gap-down device, the gap can also be propped up through the chamfer through the ascending power of spring telescopic link 1206, compares the manual work and adds backing plate 7, and the thickness that the gap can not just fit with backing plate 7 is safer, through the setting of fixed plate 1210 and solid fixed ring 1205 of roof 1203 downside, accomplishes the further fixation of backing plate 7 voluntarily, prevents that backing plate 7 from taking place sideslip or displacement from top to bottom, and overall structure has safe operability, easily implementation.
Claims (6)
1. The main support for foundation pit engineering is characterized by comprising a main support, a tie bar, a diagonal brace, an enclosing purlin and a pressurizing assembly;
the main supports are provided with a plurality of main supports, the main supports are arranged in parallel, and the tie bars are arranged on the upper side and the lower side between two adjacent main supports;
the two ends of the diagonal braces are respectively connected with the intersection points of two adjacent sectional materials and the tie rod in a diagonal manner, the diagonal braces are arranged in pairs, and the diagonal braces arranged in pairs are mutually intersected;
the enclosing purlin is arranged at the top and the inner side of the middle of the retaining wall body;
the enclosing purlin is directly connected with the main support or connected with the pressurizing assembly.
2. A main support for foundation pit engineering according to claim 1, wherein the main support comprises a profile and an end plate;
the two ends of the section bar are fixedly connected with the end plates, and the end plates are used for lengthening connection between the two main supports.
3. The main support for foundation pit engineering according to claim 1, wherein the pressurizing assembly comprises a pressurizing beam, a pressurizing cushion block, a cushion plate and a jack;
the pressurizing beam is arranged at one ends of the main supports, one side of the pressurizing beam is connected with the main supports, the other side of the pressurizing beam is connected with the pressurizing cushion blocks, the pressurizing cushion blocks are provided with a plurality of pressurizing cushion blocks, a plurality of setting spaces for the jack are reserved among the pressurizing cushion blocks, and the jack can be arranged among the pressurizing cushion blocks.
4. A main support for foundation pit engineering according to claim 3, wherein the pressurizing cushion block is arranged between the pressurizing beam and the enclosing purlin, the pressurizing cushion block is a pressurizing member, the pressurizing cushion block is fixedly connected with the enclosing purlin, the pressurizing cushion block and the pressurizing beam can be separated from each other, and the pressurizing cushion block is tightly propped against the pressurizing beam.
5. A main support for foundation pit engineering according to claim 3, wherein the pad is used for transferring force and adjusting size, one or more layers of the pad are inserted between the pressure beam and the pressure pad after the jack is pressed to jack up a certain distance between the pressure beam and the surrounding purlin, and the pressure beam, the pad and the pressure pad are again jacked up after the jack is loosened.
6. The main support for foundation pit engineering according to claim 1, further comprising a node plate, a bearing plate and a rib plate, wherein the node plate is arranged at a node of the connection position of the tie bar and the diagonal brace, the node plate is fixedly connected with the tie bar, the bearing plate is vertically and fixedly connected with the outer end face of the node plate, the end part of the diagonal brace is fixedly connected with the end face of the bearing plate, and the bearing plate is positioned on two sides of the diagonal brace and fixedly provided with the rib plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211445218.9A CN116201132A (en) | 2022-11-18 | 2022-11-18 | Main support applied to foundation pit engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211445218.9A CN116201132A (en) | 2022-11-18 | 2022-11-18 | Main support applied to foundation pit engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116201132A true CN116201132A (en) | 2023-06-02 |
Family
ID=86513662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211445218.9A Pending CN116201132A (en) | 2022-11-18 | 2022-11-18 | Main support applied to foundation pit engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116201132A (en) |
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2022
- 2022-11-18 CN CN202211445218.9A patent/CN116201132A/en active Pending
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