CN116335149A - Construction method of small ultra-deep foundation pit by using front-mounted steel support system - Google Patents
Construction method of small ultra-deep foundation pit by using front-mounted steel support system Download PDFInfo
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- CN116335149A CN116335149A CN202310130413.0A CN202310130413A CN116335149A CN 116335149 A CN116335149 A CN 116335149A CN 202310130413 A CN202310130413 A CN 202310130413A CN 116335149 A CN116335149 A CN 116335149A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a construction method of a small ultra-deep foundation pit by using a front-mounted steel support system, which adopts the front-mounted steel support system, wherein the front-mounted steel support system comprises a plurality of lattice columns, a plurality of connecting devices, front-mounted steel supports, a plurality of steel strands, a plurality of through jacks, a plurality of jack foundations, a plurality of steel strand guide frames, a plurality of servo cylinders and a hydraulic system; the adjustable angle brace is arranged on the steel support, so that dead weight of the front-mounted steel support and dead weight of the upper pouring concrete can be effectively transferred to the ground, the front-mounted steel support is kept horizontal, and the servo oil cylinder can be prevented from being subjected to vertical torsion when the servo oil cylinder supports the underground continuous wall in the horizontal direction, so that construction safety and equipment stress rationality are improved.
Description
Technical Field
The invention belongs to the technical field of constructional engineering machinery, and particularly relates to a construction method of a small ultra-deep foundation pit by using a front-mounted steel support system.
Background
The small ultra-deep foundation pit (such as a subway end well) has the characteristics of small area, large depth, high deformation control requirement and the like, and a supporting scheme of adding a steel support (or a concrete support) to the underground diaphragm wall is generally adopted.
The underground diaphragm wall is supported by simply using the traditional steel support (or concrete support), and the defects that the super-excavation has long support time, the deformation of the underground diaphragm wall cannot be actively controlled, the construction concrete support needs to be excavated after the strength of the underground diaphragm wall reaches the standard, the construction period is influenced and the like exist.
Disclosure of Invention
The invention aims to invent a construction method of a small ultra-deep foundation pit by using a front-mounted steel support system, and solves the problems that the prior art has overlong ultra-excavation support-free time, cannot actively control the deformation of an underground diaphragm wall, and influences the construction period because the construction concrete is excavated after the strength of the construction concrete reaches the standard.
In order to solve the technical problems, the invention provides the following technical scheme:
the construction method of the small ultra-deep foundation pit with the front-mounted steel support system comprises the following steps that the front-mounted steel support system is adopted, the front-mounted steel support system comprises a plurality of lattice columns, a plurality of connecting devices, front-mounted steel supports, a plurality of steel strands, a plurality of through jacks, a plurality of jack foundations, a plurality of steel strand guide frames, a plurality of servo cylinders and a hydraulic system, the front-mounted steel support comprises a steel enclosing purlin and a plurality of corner horizontal diagonal braces arranged at four corners of the steel enclosing purlin, the inner side of each corner of the steel enclosing purlin, which is located at the innermost corner, is correspondingly provided with one lattice column, the lattice columns are pressed into a soil layer in advance according to a design position, each corner of the steel enclosing purlin is connected with the corresponding lattice column through the corresponding connecting devices, and the jack foundations are respectively arranged at the four corners of a continuous wall head layer ring beam; the penetrating type jack is arranged on the corresponding jack foundation; the steel strand guide frames are arranged on the corresponding jack foundation or the ring beam at the first layer of the continuous wall; the steel strands are erected on the corresponding steel strand guide frames; the inner side surface of the steel enclosing purlin and the two side surfaces of the corner horizontal diagonal bracing are respectively provided with a plurality of adjustable bracing angles at equal intervals in a bolt connection mode; the hydraulic system is arranged on a continuous wall first layer ring beam or ground or a front-mounted steel support, and the plurality of servo cylinders are arranged on the outer side surface of the steel purlin along the circumferential direction of the steel purlin at intervals, and the method comprises the following steps:
and 6, repeating the steps 3 to 5 until the excavation supporting construction of the small ultra-deep foundation pit is completed, and disassembling the front-mounted steel support at the bottom layer to hoist the components of the front-mounted steel support from the foundation pit.
Preferably, in the construction method of a small ultra-deep foundation pit using a front-mounted steel support system, the connection device includes a bearing tripod, a tripod support plate, two connection angles, a plurality of weld nuts, a plurality of adjustment bolts, an adjustment support plate, two lattice column U-bolts, two lattice column connection plates, four lattice column connection nuts, a horizontal diagonal connection plate, two horizontal diagonal U-bolts and four horizontal diagonal connection nuts, the bearing tripod is a right-angled triangle structure, the bearing tripod has a horizontal plane and a vertical plane, the horizontal diagonal connection plate is fixedly arranged on the horizontal plane, the tripod support plate is fixedly arranged on the vertical plane, the horizontal diagonal connection plate is mutually perpendicular to the tripod support plate, the two connection angles are vertically arranged on the left and right sides of the tripod support plate respectively, the upper and lower parts of the two connecting angle steels are respectively provided with a first through hole for the passing through of a lattice column U-shaped bolt, the two lattice column U-shaped bolts are connected with the lattice column connecting nuts through corresponding lattice column connecting plates after hooping the lattice column, two sides of the horizontal diagonal bracing connecting plates are respectively provided with a row of second through holes for the passing through of corresponding horizontal diagonal bracing U-shaped bolts along the longitudinal direction of the two horizontal diagonal bracing connecting plates, the two horizontal diagonal bracing U-shaped bolts connect the horizontal diagonal bracing connecting plates with the corner horizontal diagonal bracing through corresponding horizontal diagonal bracing connecting nuts, the upper and lower parts of the tripod supporting plates are respectively provided with a third through hole, threaded holes matched with the adjusting bolts are arranged at the third through holes, one end of each adjusting bolt is hinged with the adjusting supporting plate through a spherical hinge mode after passing through the corresponding threaded holes in the tripod supporting plates, the adjusting bolts can be rotated to correspondingly adjust the supporting plates, so that the adjusting support plate is attached to the side surface of the lattice column.
Preferably, in the construction method of a small ultra-deep foundation pit using a front-mounted steel support system, the bearing tripod comprises two tripod vertical rods, two tripod horizontal rods, two tripod diagonal rods and three tripod cross rods, the tripod vertical rods, the tripod horizontal rods and the tripod diagonal rods are connected to form a tripod structure, the end parts of the two tripod structures are respectively connected through the three tripod cross rods, the horizontal diagonal connecting plate is arranged on the upper part of the bearing tripod, the horizontal diagonal connecting plate is respectively and rigidly connected with the tripod horizontal rods and the tripod cross rods, and the tripod vertical rods and the tripod cross rods are rigidly connected with the tripod support plate, so that the bearing tripod is supported on the tripod support plate.
Preferably, in the construction method of a small ultra-deep foundation pit using a front-mounted steel support system, each adjusting support plate is hinged with three adjusting bolts, and the three adjusting bolts are arranged at equal intervals along the horizontal direction.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, the steel enclosing purlin of the front-mounted steel support comprises a plurality of straight section steel beams and four L-shaped corner steel beams, the straight section steel beams are assembled to form four strip steel beams in a bolt connection mode, the ends of the four strip steel beams are connected to form a rectangular steel enclosing purlin through the L-shaped corner steel beams, the strip steel beams are connected with the corresponding L-shaped corner steel beams in a bolt connection mode, two ends of the corner horizontal diagonal braces are connected with the inner side wall of the steel enclosing purlin through corner horizontal diagonal brace connecting sections respectively, each corner of the steel enclosing purlin is provided with a plurality of parallel corner horizontal diagonal braces, two parallel corner horizontal diagonal braces located at the inner side are provided with a plurality of connecting beams, and the corner horizontal diagonal braces are paved with scaffold boards as the operation platform.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, the connecting beam comprises a connecting beam steel beam and two connecting beam end connecting plates, the two connecting beam end connecting plates are fixedly arranged at two ends of the connecting beam steel beam, through holes for the connecting beam U-shaped bolts to pass through are formed in the two connecting beam end connecting plates, and the corresponding corner horizontal diagonal braces of the connecting beam U-shaped bolt hoops are fixed on the corresponding connecting beam end connecting plates through connecting beam connecting nuts.
Preferably, in the construction method for a small ultra-deep foundation pit using a front-mounted steel support system, the corner horizontal diagonal bracing includes a gusset steel beam, two gusset end connection plates, and a plurality of gusset leg connection channels, the two gusset end connection plates are respectively fixedly arranged at two ends of the gusset steel beam, the gusset leg connection channels are symmetrically arranged on two sides of the gusset steel beam in pairs at equal intervals along the longitudinal direction of the gusset steel beam, bolt holes for connecting corresponding corner horizontal diagonal bracing connection sections are formed in the two gusset end connection plates, and a plurality of bolt holes for connecting corresponding adjustable gussets are formed in the gusset leg connection channels at intervals;
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, the corner horizontal diagonal bracing connecting section comprises a connecting section steel beam, a connecting section gusset connecting plate and a connecting section steel enclosing purlin connecting plate, the connecting section gusset connecting plate and the connecting section steel enclosing purlin connecting plate are respectively and rigidly connected to two ends of the connecting section steel beam, the connecting section steel enclosing purlin connecting plate is obliquely arranged, the connecting section gusset connecting plate is vertically arranged, a bolt hole for connecting the steel enclosing purlin is formed in the connecting section steel enclosing purlin connecting plate, and a bolt hole for connecting the corresponding corner horizontal diagonal bracing is formed in the connecting section gusset connecting plate.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, the cross section of the straight section steel beam is in a double-web H shape, and is formed by fixedly connecting the straight section steel beam web with straight section steel beam flange plates at two sides; the cross section of the L-shaped corner steel beam is double-web H-shaped, and the L-shaped corner steel beam is formed by fixedly connecting an L-shaped corner steel beam web with L-shaped corner steel beam flange plates on the inner side and the outer side; and holes are formed in the web plate of the L-shaped corner steel beam, the steel strand anchorage devices are arranged at the holes, and stiffening plates are respectively arranged at two sides of the steel strand anchorage devices.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, the servo oil cylinder comprises an oil cylinder sleeve, an adjusting cushion block, sleeve hook rollers and an oil cylinder body, wherein the oil cylinder body is arranged in the oil cylinder sleeve, one end of the oil cylinder sleeve is provided with a vertical end plate, an adjusting cushion block for adjusting the total elongation of the servo oil cylinder is arranged in the oil cylinder sleeve, the adjusting cushion block is located between the vertical end plate and the oil cylinder body, the upper end of the vertical end plate is provided with a sleeve hook which is downwards opened and is used for being hung against a steel purlin, a plurality of sleeve hook rollers are arranged between the vertical end plate and the sleeve hook, and a bolt hole for connecting the steel purlin is formed in the vertical end plate.
Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:
the invention discloses a construction method of a small ultra-deep foundation pit with a front-mounted steel support system, which adopts the front-mounted steel support system, wherein the front-mounted steel support system comprises a plurality of lattice columns, a plurality of connecting devices, front-mounted steel supports, a plurality of steel strands, a plurality of through jacks, a plurality of jack foundations, a plurality of steel strand guide frames, a plurality of servo cylinders and a hydraulic system, the front-mounted steel support comprises a steel enclosing purlin and a plurality of corner horizontal diagonal braces arranged at four corners of the steel enclosing purlin, the inner side of each corner of the steel enclosing purlin, which is positioned at the innermost corner, is correspondingly provided with one lattice column, the lattice column is pressed into a soil layer in advance according to a design position, each corner of the steel enclosing purlin is connected with the corresponding lattice column through the corresponding connecting device, and the jack foundations are respectively arranged at four corner positions of a continuous wall head layer girth beam; the penetrating type jack is arranged on the corresponding jack foundation; the steel strand guide frames are arranged on the corresponding jack foundation or the ring beam at the first layer of the continuous wall; the steel strands are erected on the corresponding steel strand guide frames; the inner side surface of the steel enclosing purlin and the two side surfaces of the corner horizontal diagonal bracing are respectively provided with a plurality of adjustable bracing angles at equal intervals in a bolt connection mode; the hydraulic system is arranged on a continuous wall first layer ring beam or ground or a front-mounted steel support, and the plurality of servo cylinders are arranged on the outer side surface of the steel purlin along the circumferential direction of the steel purlin at intervals, and the method comprises the following steps: step 1, completing pouring construction of an underground diaphragm wall and a diaphragm wall first-layer ring beam, pressing lattice columns into a soil layer according to a designed position, excavating the soil layer to a certain depth, pouring a concrete cushion layer on the soil layer, and setting a jack foundation on the diaphragm wall first-layer ring beam; and installing a penetrating jack and a steel strand guide frame; step 2, hanging the component members of the front-mounted steel support to a concrete cushion layer through gaps of a ring beam of the front-mounted steel support, completing assembly of the front-mounted steel support, distributing steel strand anchors at four corners of a steel enclosing purlin of the front-mounted steel support, connecting each penetrating jack with the corresponding steel strand anchor on the front-mounted steel support through corresponding steel strands, connecting a plurality of servo cylinders and a plurality of penetrating jacks with the hydraulic system respectively, adjusting adjustable supporting feet to extend out and support the adjustable supporting feet on the concrete cushion layer, fine-adjusting the adjustable supporting feet to enable the front-mounted steel support to be horizontal, driving the servo cylinders to extend out through the hydraulic system, applying a certain pressure to the underground continuous wall, and performing active control of deformation of the underground continuous wall; step 3, arranging a concrete support or a steel support above the front-mounted steel support according to a designed position, simultaneously continuously excavating a soil layer, realizing the following-up excavation of the front-mounted steel support, and improving the construction efficiency of the foundation pit; step 4, excavating a soil layer to a certain depth, and pouring a concrete cushion layer on the upper part of the soil layer; step 5, driving the servo oil cylinder to shrink through the hydraulic system, driving the penetrating jack through the pressing system to enable the front-mounted steel support to descend to the upper portion of the current concrete cushion layer by a certain distance, leveling the front-mounted steel support through the penetrating jack, adjusting the adjustable supporting feet 54 to enable the adjustable supporting feet to be supported on the concrete cushion layer, driving the servo oil cylinder to extend through the hydraulic system, applying a certain pressure to the underground diaphragm wall 1, actively controlling deformation of the underground diaphragm wall, and connecting each lattice column with a corresponding corner horizontal diagonal brace through a connecting device; step 6, repeating the steps 3 to 5 until the excavation supporting construction of the small ultra-deep foundation pit is completed, and disassembling the front-mounted steel support at the bottom layer to hoist the components of the front-mounted steel support from the foundation pit; by adopting the front-mounted steel support system, the construction method of the front-mounted concrete support or the steel support along with the excavation, the descending and the supporting can be realized, the construction period and the super-excavation unsupported time are effectively shortened, and the construction method has the advantages of high mechanization degree, high construction safety, high turnover utilization rate and the like; the front-mounted steel support is integrally lifted by adopting the penetrating jack to be matched with the steel strand, so that the lifting device has the advantages of stable descending, safety, reliability and good synchronism; the adjustable angle brace is arranged on the steel support, so that dead weight of the front-mounted steel support and dead weight of the upper pouring concrete can be effectively transferred to the ground, the front-mounted steel support is kept horizontal, and the servo oil cylinder can be prevented from being subjected to vertical torsion when the servo oil cylinder supports the underground continuous wall in the horizontal direction, so that construction safety and equipment stress rationality are improved.
Drawings
Fig. 1 is a three-dimensional view showing the construction state of a front-end steel support system according to the present invention.
Fig. 2 is a plan view showing a construction state of a front-mounted steel support system according to the present invention.
Fig. 3 is a three-dimensional view of a front-end steel support system of the present invention.
Fig. 4 is a three-dimensional view of a lattice column in accordance with the present invention.
Fig. 5 is a front view of the connecting device of the present invention.
Fig. 6 is a top view of the connection device of the present invention.
Fig. 7 is a side view of the connection device of the present invention.
Fig. 8 is a three-dimensional view of the connecting device of the present invention.
Fig. 9 is a three-dimensional view of a straight steel beam according to the present invention.
Fig. 10 is a three-dimensional view of an L-shaped corner steel beam according to the present invention.
FIG. 11 is a three-dimensional view of a servo cylinder in accordance with the present invention.
Fig. 12 is a three-dimensional view of an adjustable foot according to the present invention.
Fig. 13 is a three-dimensional view of a corner horizontal diagonal bracing joint segment in accordance with the present invention.
Fig. 14 is a plan view of a corner horizontal diagonal bracing connection segment in accordance with the present invention.
Fig. 15 is a three-dimensional view of a corner horizontal diagonal brace in accordance with the present invention.
Fig. 16 is a three-dimensional view of a tie beam in the present invention.
Fig. 17 is a schematic structural view of step 1 of a construction method of a small ultra-deep foundation pit using a pre-positioned steel support system.
Fig. 18 is a schematic structural view of step 2 of a construction method of a small ultra-deep foundation pit using a pre-positioned steel support system.
Fig. 19 is a schematic structural view of step 3 of a construction method of a small ultra-deep foundation pit using a pre-positioned steel support system.
Fig. 20 is a schematic structural view of step 4 of a construction method of a small ultra-deep foundation pit using a pre-positioned steel support system.
Fig. 21 is a schematic structural view of step 5 of a construction method of a small ultra-deep foundation pit using a pre-positioned steel support system.
Fig. 22 is a schematic structural view of step 6 of a construction method of a small ultra-deep foundation pit using a pre-positioned steel support system.
In the figure:
1. underground continuous wall,
2. A continuous wall first layer ring beam,
3. Lattice column, 31 lattice column angle steel, 32 angle steel connecting plate,
4. The horizontal diagonal brace and lattice column connecting device comprises 401, a tripod support plate, 402, connecting angle steel, 403, welding nuts, 404, adjusting bolts, 405, adjusting support plates, 406, lattice column U-shaped bolts, 407, lattice column connecting plates, 408, lattice column connecting nuts, 409, a tripod vertical rod, 410, a tripod horizontal rod, 411, a tripod diagonal rod, 412, a tripod cross rod, 413, a horizontal diagonal connecting plate, 414, a horizontal diagonal U-shaped bolt, 415, a horizontal diagonal connecting nut
5. Front-mounted steel support,
51. Straight section steel girder, 511, straight section steel girder web, 512, straight section steel girder flange plate,
52.L-shaped corner steel beam, 521.L-shaped corner steel beam web, 522.L-shaped corner steel beam flange plate, 523.steel strand anchor, 524.stiffening plate,
53. Servo oil cylinder, 531, oil cylinder sleeve, 532, adjusting cushion block, 533, sleeve hook roller, 534, oil cylinder body, 534, vertical end plate, 535, sleeve hook,
54. Adjustable support foot 541, support foot connection board 542, support foot,
55. The corner horizontal diagonal bracing connecting section, 551, connecting section steel girder, 552, connecting section angle brace connecting plate, 553, connecting section steel purlin connecting plate, connecting section steel ring,
56. Corner horizontal diagonal bracing, 561, gusset steel girder, 562, gusset end connecting plate, 563, gusset supporting leg connecting channel steel,
57. Connecting beams, 571, connecting beam steel beams, 572, connecting beam end connecting plates,
58. A U-shaped bolt of a connecting beam,
59. A connecting beam connecting nut,
510. A scaffold board,
6. Steel strand wires,
7. A penetrating jack,
8. Jack foundation,
9. A steel strand guide frame,
10. Concrete or steel supports
11. Soil layer,
12. And a concrete cushion layer.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. The technical contents and features of the present invention will be described in detail below with reference to the attached drawings by way of the illustrated embodiments. It should be further noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. For convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the drawings, but this should not be construed as a limitation of the technical scheme of the present invention.
Referring to fig. 1 to 22, the present embodiment discloses a construction method of a small ultra-deep foundation pit using a front steel support system, which adopts a front steel support system, the front steel support system includes a plurality of lattice columns 3, a plurality of connection devices 4, a front steel support 5, a plurality of steel strands 6, a plurality of penetrating jacks 7, a plurality of jack foundations 8, a plurality of steel strand guide frames 9, a plurality of servo cylinders 53 and a hydraulic system, the front steel support 5 includes a steel enclosing purlin and a plurality of corner horizontal diagonal braces 56 disposed at four corners of the steel enclosing purlin, the inner side of the corner horizontal diagonal brace 56 located at the innermost side on each corner of the steel enclosing purlin is correspondingly provided with a lattice column 3, the lattice column 3 is pressed into the soil layer 11 in advance according to a design position, the corner horizontal diagonal brace 56 located at the innermost side on each corner of the steel enclosing purlin is connected with the corresponding lattice column 3 through the corresponding connection device 4, and the plurality of jack foundations 8 are respectively disposed at four corner positions of the continuous wall layer 2; the penetrating jack 7 is arranged on the corresponding jack foundation 8; the steel strand guide frames 9 are arranged on the corresponding jack foundations 8 or the continuous wall first layer ring beams 2; the steel strand 6 is erected on a corresponding steel strand guide frame 9; the inner side surface of the steel purlin and the two side surfaces of the corner horizontal diagonal bracing 56 are respectively provided with a plurality of adjustable bracing angles 54 at equal intervals in a bolt connection mode; the hydraulic system is arranged on the continuous wall first layer ring beam 2 or the ground or the front steel support 5, and the plurality of servo cylinders 53 are arranged on the outer side surface of the steel purlin along the circumferential interval of the steel purlin, and the method comprises the following steps:
And 6, referring to fig. 22, repeating the steps 3 to 5 until the excavation supporting construction of the small ultra-deep foundation pit is completed, and disassembling the front steel support 5 at the bottom layer to hoist the components from the foundation pit.
The construction method of the small ultra-deep foundation pit with the front-mounted steel support system provided by the invention adopts the front-mounted steel support system, and the front-mounted steel support system can realize the construction method of the front-mounted concrete support or the steel support 10 along with the excavation and the descending, so that the construction period and the ultra-excavation non-support time are effectively shortened, and the construction method has the advantages of high mechanization degree, high construction safety, high turnover utilization rate and the like; the front-mounted steel support 5 is integrally lifted by adopting the penetrating jack 7 and the steel stranded wire 6, so that the lifting device has the advantages of stable descending, safety, reliability and good synchronism; the adjustable angle brace 54 is arranged on the steel support, so that the dead weight of the front-mounted steel support 5 and the dead weight of the upper casting concrete can be effectively transferred to the ground, the front-mounted steel support 5 is kept horizontal, and the servo oil cylinder 53 can be ensured not to bear vertical torsion when supporting the underground continuous wall 1 in the horizontal direction, so that the construction safety and the equipment stress rationality are improved.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, please refer to fig. 5 to 8, the connecting device 4 includes a bearing tripod, a tripod support plate 401, two connecting angles 402, a plurality of welding nuts 403, a plurality of adjusting bolts 404, an adjusting support plate 405, two lattice column U-shaped bolts 406, two lattice column connecting plates 407, four lattice column connecting nuts 408, a horizontal diagonal connecting plate 413, two horizontal diagonal U-shaped bolts 414 and four horizontal diagonal connecting nuts 415, the bearing tripod is a right angle triangle structure, the bearing tripod has a horizontal plane and a vertical plane, the horizontal diagonal connecting plate 413 is fixedly arranged on the horizontal plane, the tripod support plate is fixedly arranged on the vertical plane, the horizontal diagonal connecting plate 413 is perpendicular to the tripod support plate 401, the two connecting angles 402 are vertically arranged on the left side and the right side of the tripod supporting plate 401 respectively, the upper part and the lower part of the two connecting angles 402 are respectively provided with a first through hole for the passing of a lattice column U-shaped bolt 406, the two lattice column U-shaped bolts 406 are connected with the lattice column 3 through corresponding lattice column connecting plates 407 and lattice column connecting nuts 408 after holding the lattice column 3, the two sides of the horizontal diagonal bracing connecting plates 413 are respectively provided with a row of second through holes for the passing of corresponding horizontal diagonal bracing U-shaped bolts 414 along the longitudinal direction of the two sides, the two horizontal diagonal bracing U-shaped bolts 414 connect the horizontal diagonal bracing connecting plates 413 with the corner horizontal diagonal bracing 56 through corresponding horizontal diagonal bracing connecting nuts 415, the upper part and the lower part of the tripod supporting plate 401 are respectively provided with a third through hole, and threaded holes matched with the adjusting bolts 404 are arranged at the third through holes, one end of the adjusting bolt 404 passes through a corresponding threaded hole on the tripod support plate 401 and then is hinged with the adjusting support plate 405 in a ball hinge mode, and the adjusting support plate 405 corresponding to the abnormal movement of the adjusting bolt 404 can be rotated, so that the adjusting support plate 405 is attached to the side face of the lattice column 3. Considering the possibility that the lattice column 3 may have torsion and vertical deflection, the connection is firstly performed by preliminary positioning, so that the horizontal diagonal bracing connecting plate 413 is attached to the bottom surface of the corner horizontal diagonal bracing 56; then the connecting device 4 is rotated, the adjusting bolt 404 is rotated, the two adjusting support plates 405 are attached to the side surfaces of the lattice column 3, and then the connecting device 4 and the lattice column 3 are connected and fixed by adopting the lattice column U-shaped bolts 406, the lattice column connecting plates 407 and the lattice column connecting nuts 408; and then the two horizontal diagonal bracing U-shaped bolts 414 hoop the corner horizontal diagonal bracing 56 and are fastened by the horizontal diagonal bracing connecting nuts 415, so that the connection between the corner horizontal diagonal bracing 56 and the lattice column 3 is realized.
On the other hand, since the horizontal diagonal brace 56 and the connecting device 4 are connected by the horizontal diagonal brace U-shaped bolt 414, after the horizontal diagonal brace connecting plate 413 is attached to the bottom surface of the horizontal diagonal brace 56, the connecting device 4 is rotated to ensure the connection between the lattice column 3 and the connecting device 4 when the lattice column 3 has a torsion deviation and a horizontal position deviation, and since the horizontal diagonal brace connecting plate 413 is provided with a plurality of holes, i.e., two rows of second through holes, the connecting device 4 can be rotated to select the appropriate second through holes to insert the corresponding horizontal diagonal brace U-shaped bolt 414, thereby realizing the connection between the horizontal diagonal brace 56 and the connecting device 4.
On the other hand, because the screws at the two ends of the U-shaped bolt of the lattice column can freely rotate in the corresponding first through holes corresponding to the connecting angle steel, and one end of the adjusting bolt 404 passes through the corresponding threaded holes in the tripod support plate 401 and then is hinged with the adjusting support plate 405 in a ball hinge mode through the adjusting bolt 404, the adjusting bolt 404 is rotated, the two adjusting support plates 405 can be attached to the side surfaces of the lattice column 3, the effective force transmission connection, namely the effective supporting connection, of the lattice column 3 and the horizontal diagonal brace is ensured when the perpendicularity deviation exists in the lattice column 3, and the connecting device 4 can always be in effective supporting connection with the lattice column 3 by means of the adjusting support plate 405, so that the connecting device 4 has high adaptability and can adapt to the embedded errors such as the deviation of the horizontal distance, plane torsion, vertical inclination and the like of the lattice column 3.
Moreover, because the adjusting support plate 405 is attached to the side surface of the lattice column 3, the vertical force of the corner horizontal diagonal brace 56 supported by steel can be well transmitted to the lattice column 3, and because the connection between the connecting device 4 and the corner horizontal diagonal brace 56 adopts a U-shaped bolt hoop mode, the connecting device 4 is not restrained in the horizontal direction, the corner horizontal diagonal brace 56 can be effectively prevented from transmitting the horizontal force to the lattice column 3, and the safety is ensured.
In order to improve the rigidity and the bearing performance of the bearing tripod, the bearing tripod comprises two tripod vertical rods 409, two tripod horizontal rods 410, two tripod diagonal rods 411 and three tripod cross rods 412, the tripod vertical rods 409, the tripod horizontal rods 410 and the tripod diagonal rods 411 are connected to form a tripod structure, the end parts of the two tripod structures are respectively connected through the three tripod cross rods 412, the horizontal diagonal connecting plates 413 are arranged on the upper part of the bearing tripod, the horizontal diagonal connecting plates 413 are respectively and rigidly connected with the tripod horizontal rods 410 and the tripod cross rods 412, and the tripod vertical rods 409 and the tripod cross rods 412 are rigidly connected with the tripod support plates 401, so that the bearing tripod is supported on the tripod support plates 401.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, each adjusting support plate 405 is hinged with three adjusting bolts 404, and the three adjusting bolts 404 are arranged at equal intervals along the horizontal direction, so that the adjusting support plates 405 are tightly attached to the side surfaces of the lattice columns 3, and the force transmission performance between the adjusting support plates is improved.
Referring to fig. 4, the lattice column 3 is formed by connecting four lattice column angle steels 31 through a plurality of angle steel connecting plates 32.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, the steel enclosing purlin of the front-mounted steel support 5 comprises a plurality of straight section steel beams 51 and four L-shaped corner steel beams 52, the straight section steel beams 51 are assembled to form four strip steel beams in a bolt connection mode, the ends of the four strip steel beams are connected to form a rectangular steel enclosing purlin through the L-shaped corner steel beams 52, the strip steel beams and the corresponding L-shaped corner steel beams 52 are connected in a bolt connection mode, two ends of the corner horizontal diagonal braces 56 are respectively connected with the inner side wall of the steel enclosing purlin through corner horizontal diagonal brace connecting sections 55, each corner of the steel enclosing purlin is provided with a plurality of parallel corner horizontal diagonal braces 56, two parallel corner horizontal diagonal braces 56 positioned on the inner side are provided with a plurality of connecting beams 57, so that the overall stability of the front-mounted steel support 5 is improved, and the corner horizontal diagonal braces 56 are paved with scaffold plates 510 as working platforms to facilitate construction operations of constructors.
Preferably, in the above construction method for a small ultra-deep foundation pit using a front-mounted steel support system, please refer to fig. 5 to 8, the adjustable support leg 54 includes a support leg connecting plate 541 and a support leg body 542, the support leg connecting plate 541 is fixedly disposed on an upper portion of the support leg body 542, the support leg connecting plate 541 is vertically disposed, and a plurality of bolt holes for adjusting the height of the adjustable support leg 54 are vertically disposed on the support leg connecting plate 541 along a vertical interval, so as to realize the support height of the adjustable support leg 54.
Preferably, in the above construction method of a small ultra-deep foundation pit using a front-mounted steel support system, please refer to fig. 9, the cross section of the straight steel beam 51 is in a double-web H shape, and is formed by fixedly connecting a straight steel beam web 511 with straight steel beam flange plates 512 on both sides; referring to fig. 10, the cross section of the L-shaped corner steel beam 52 is a double-web H-shape, and is formed by fixedly connecting an L-shaped corner steel beam web 521 with L-shaped corner steel beam flange plates 522 on the inner side and the outer side; the L-shaped corner steel beam web 521 is provided with a hole, and a steel strand anchor 523 is arranged at the hole so as to form effective connection between the penetrating jack 7 and the steel purlin, thereby finally realizing stable lifting of the steel purlin and improving construction safety.
Preferably, in the construction method of the small ultra-deep foundation pit using the pre-positioned steel support system, please refer to fig. 11, the servo cylinder 53 includes a cylinder casing 531, an adjusting pad 532, a casing hanger roller 533, and a cylinder body 534, the cylinder body 534 is disposed in the cylinder casing 531, one end of the cylinder casing 531 is provided with a vertical end plate 535, an adjusting pad 532 for adjusting the total elongation of the servo cylinder 53 is disposed in the cylinder casing 531, the adjusting pad 532 is disposed between the vertical end plate 535 and the cylinder body 534, the upper end of the vertical end plate 535 is provided with a casing hanger 536 which is opened downwards and is used for hanging against the steel purlin, a plurality of casing hanger rollers 533 are disposed between the vertical end plate 535 and the casing hanger 536, and bolt holes for connecting the steel purlin are formed in the vertical end plate 535. Through setting up the cover case couple gyro wheel 533, can make things convenient for servo cylinder 53 to enclose the purlin along the steel, reduce the friction force between the two, after servo cylinder 53 reaches the preset position, can enclose the purlin fixed connection through vertical end plate 535 last the bolt hole that is used for connecting the steel, utilize bolt and steel to set up.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, please refer to fig. 13 to 14, the corner horizontal diagonal bracing connecting section 55 includes a connecting section steel beam 551, a connecting section gusset connecting plate 552 and a connecting section steel enclosing purlin connecting plate 553, the connecting section gusset connecting plate 552 and the connecting section steel enclosing purlin connecting plate 553 are respectively and just connected to two ends of the connecting section steel beam 551, the connecting section steel enclosing purlin connecting plate 553 is obliquely arranged, the connecting section gusset connecting plate 552 is vertically arranged, the connecting section steel enclosing purlin connecting plate 553 is provided with a bolt hole for connecting the steel enclosing purlin, and the connecting section gusset connecting plate 552 is provided with a bolt hole for connecting the corresponding corner horizontal diagonal bracing 56, thereby realizing detachable connection between the corner horizontal diagonal bracing connecting section 55 and the corner horizontal diagonal bracing 56 and the steel enclosing purlin, and improving the convenience of installation and turnover and use rate.
Preferably, in the construction method of a small ultra-deep foundation pit using a front-mounted steel support system as described above, please refer to fig. 15, the corner horizontal diagonal brace 56 includes a gusset steel beam 561, two gusset end connection plates 562, and a plurality of gusset foot connection channels 563, the two gusset end connection plates 562 are respectively fixed at two ends of the gusset steel beam 561, the gusset foot connection channels 563 are symmetrically disposed on two sides of the gusset steel beam 561 at equal intervals along a longitudinal direction of the gusset steel beam 561, bolt holes for connecting the corresponding corner horizontal diagonal brace connection sections 55 are formed in the two gusset end connection plates 562, and a plurality of bolt holes for connecting the corresponding adjustable angle braces 54 are formed on the gusset foot connection channels 563 at intervals.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, please refer to fig. 16, the tie beam 57 includes a tie beam steel beam 571 and two tie beam end connection plates 572, the two tie beam end connection plates 572 are fixedly disposed at two ends of the tie beam steel beam 571, through holes for the tie beam U-bolts 58 to pass through are disposed on the two tie beam end connection plates 572, and the corresponding corner horizontal diagonal braces 56 of the tie beam U-bolts 58 are fixed on the corresponding tie beam end connection plates 572 through the tie beam connection nuts 59 after hooping, thereby realizing detachable connection between the tie beam 57 and the corner horizontal diagonal braces 56 and improving the convenience of assembly and disassembly and turnover use rate.
Preferably, in the construction method of the small ultra-deep foundation pit using the front-mounted steel support system, an integral platform plate (not shown) can be arranged on the front-mounted steel support 5, and the construction method can be used as an operation platform for bearing operators, engineering materials and side templates of concrete supports and can also be used as a bottom die for casting the concrete supports on the upper part, so that frequent assembly and disassembly of the die carrier can be avoided, the turnover use efficiency of the die carrier is effectively improved, the construction efficiency of the foundation pit is further improved, and the construction period is shortened.
The construction method of the small ultra-deep foundation pit by using the front-mounted steel support system has the following principle and effects: the front-mounted steel support 5 is matched with the underground diaphragm wall 1 and the traditional concrete support or the steel support 10 to form a small ultra-deep foundation pit support system; the front-mounted steel support 5 is arranged in front of the traditional concrete support or the steel support 10, and is supported along with the excavation and the descent, so that the super-excavation unsupported time can be shortened, and the construction safety is enhanced; the servo cylinder 53 is integrated on the front-mounted steel support 5, so that pressure can be applied to the inner wall of the underground diaphragm wall 1, and active control of foundation pit deformation is realized; the front-mounted steel support 5 is integrally slid down by using the through jack 7 and matching with the steel stranded wire 6, so that the stability and safety of landing can be improved; the corner horizontal diagonal braces 56 of the front-mounted steel support 5 are connected by adopting the detachable high-adaptability connecting device 4, so that the overall stability and the construction efficiency are improved; the front steel support 5 is provided with the adjustable supporting feet 54, so that the overall stability can be improved; the working platform is arranged at the upper part of the front-mounted steel support 5, so that the construction convenience is enhanced; the front-mounted steel support 5 members are all of standard modularized design and are assembled, so that the convenience in assembly and disassembly and the turnover utilization efficiency of the members can be effectively improved.
In summary, the servo oil cylinders 53 are arranged around the steel purlin of the front-mounted steel support 5 to realize active control of deformation of the underground diaphragm wall 1, the turnover utilization rate is improved by adopting a modularized assembly design, the construction method of the front-mounted concrete support or the steel support 10 along with the excavation and the descending and the support is adopted to shorten the construction period and the super-excavation and support-free time, and the invention has the advantages of high mechanical degree, high construction safety, high turnover utilization rate and the like. Moreover, (1) the corner horizontal support of the front-mounted steel support 5 is connected with the lattice column 3 by adopting a special connecting device 4, and the connecting device 4 can adapt to the position error of the lattice column 3, can descend along with the front-mounted steel support 5 and can be quickly installed and removed; (2) The penetrating jack 7 is matched with the steel strand 6 to integrally lift the front-mounted steel support 5, so that the lifting device has the advantages of stable descending, safety, reliability and good synchronism; (3) The steel support is provided with the adjustable angle brace 54, so that the dead weight of the front-mounted steel support 5 and the dead weight of the upper casting concrete can be effectively transferred to the ground, the front-mounted steel support 5 is kept horizontal, and the servo oil cylinder 53 can be ensured not to bear vertical torsion force when supporting the underground continuous wall 1 in the horizontal direction, thereby improving the construction safety and the equipment stress rationality; (4) The integral platform plate is arranged on the front-mounted steel support 5, so that the front-mounted steel support can be used as an operation platform for bearing operators, engineering materials and side templates of the concrete support and can be used as a bottom die for casting the concrete support on the upper part, frequent assembly and disassembly of the die carrier can be avoided, the turnover utilization efficiency of the die carrier is effectively improved, the construction efficiency of a foundation pit is further improved, and the construction period is shortened.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (10)
1. The construction method of the small ultra-deep foundation pit with the front-mounted steel support system is characterized in that the front-mounted steel support system is adopted and comprises a plurality of lattice columns, a plurality of connecting devices, front-mounted steel supports, a plurality of steel strands, a plurality of through jacks, a plurality of jack foundations, a plurality of steel strand guide frames, a plurality of servo cylinders and a hydraulic system, wherein the front-mounted steel support comprises a steel enclosing purlin and a plurality of corner horizontal diagonal braces arranged at four corners of the steel enclosing purlin, the inner side of each corner of the steel enclosing purlin, which is positioned at the innermost corner, is correspondingly provided with one lattice column, the lattice column is pressed into a soil layer in advance according to a design position, each corner of the steel enclosing purlin is connected with the corresponding lattice column through the corresponding connecting device, and the jack foundations are respectively arranged at the four corner positions of the continuous wall layer ring beam; the penetrating type jack is arranged on the corresponding jack foundation; the steel strand guide frames are arranged on the corresponding jack foundation or the ring beam at the first layer of the continuous wall; the steel strands are erected on the corresponding steel strand guide frames; the inner side surface of the steel enclosing purlin and the two side surfaces of the corner horizontal diagonal bracing are respectively provided with a plurality of adjustable bracing angles at equal intervals in a bolt connection mode; the hydraulic system is arranged on a continuous wall first layer ring beam or ground or a front-mounted steel support, and the plurality of servo cylinders are arranged on the outer side surface of the steel purlin along the circumferential direction of the steel purlin at intervals, and the method comprises the following steps:
Step 1, completing pouring construction of an underground diaphragm wall and a diaphragm wall first-layer ring beam, pressing lattice columns into a soil layer according to a designed position, excavating the soil layer to a certain depth, pouring a concrete cushion layer on the soil layer, and setting a jack foundation on the diaphragm wall first-layer ring beam; and installing a penetrating jack and a steel strand guide frame;
step 2, hanging the component members of the front-mounted steel support to a concrete cushion layer through gaps of a ring beam of the front-mounted steel support, completing assembly of the front-mounted steel support, distributing steel strand anchors at four corners of a steel enclosing purlin of the front-mounted steel support, connecting each penetrating jack with the corresponding steel strand anchor on the front-mounted steel support through corresponding steel strands, connecting a plurality of servo cylinders and a plurality of penetrating jacks with the hydraulic system respectively, adjusting adjustable supporting feet to extend out and support the adjustable supporting feet on the concrete cushion layer, fine-adjusting the adjustable supporting feet to enable the front-mounted steel support to be horizontal, driving the servo cylinders to extend out through the hydraulic system, applying a certain pressure to the underground continuous wall, and performing active control of deformation of the underground continuous wall;
step 3, arranging a concrete support or a steel support above the front-mounted steel support according to a designed position, and simultaneously continuously excavating a soil layer downwards, so that the support-following excavation is realized through the front-mounted steel support;
Step 4, excavating a soil layer to a certain depth, and pouring a concrete cushion layer on the upper part of the soil layer;
step 5, driving the servo oil cylinder to shrink through the hydraulic system, driving the penetrating jack through the pressing system to enable the front-mounted steel support to descend to the upper portion of the current concrete cushion layer by a certain distance, leveling the front-mounted steel support through the penetrating jack, adjusting the adjustable supporting feet 54 to enable the adjustable supporting feet to be supported on the concrete cushion layer, driving the servo oil cylinder to extend through the hydraulic system, applying a certain pressure to the underground diaphragm wall 1, actively controlling deformation of the underground diaphragm wall, and connecting each lattice column with a corresponding corner horizontal diagonal brace through a connecting device;
and 6, repeating the steps 3 to 5 until the excavation supporting construction of the small ultra-deep foundation pit is completed, and disassembling the front-mounted steel support at the bottom layer to hoist the components of the front-mounted steel support from the foundation pit.
2. The construction method for a small ultra-deep foundation pit using a front-mounted steel support system according to claim 1, wherein the connecting device comprises a bearing tripod, a tripod support plate, two connecting angle steels, a plurality of welding nuts, a plurality of adjusting bolts, an adjusting support plate, two lattice column U-shaped bolts, two lattice column connecting plates, four lattice column connecting nuts, a horizontal diagonal connecting plate, two horizontal diagonal U-shaped bolts and four horizontal diagonal connecting nuts, the bearing tripod is a right-angle triangle structure, the bearing tripod has a horizontal plane and a vertical plane, the horizontal diagonal connecting plate is fixedly arranged on the horizontal plane, the tripod support plate is fixedly arranged on the vertical plane, the horizontal diagonal connecting plate is mutually perpendicular to the tripod support plate, the two connecting angle steels are respectively vertically arranged on the left side and the right side of the tripod support plate, the upper and lower parts of the two connecting angle steels are respectively provided with a first through hole for the passing through of a lattice column U-shaped bolt, the two lattice column U-shaped bolts are connected with the lattice column connecting nuts through corresponding lattice column connecting plates after hooping the lattice column, two sides of the horizontal diagonal bracing connecting plates are respectively provided with a row of second through holes for the passing through of corresponding horizontal diagonal bracing U-shaped bolts along the longitudinal direction of the two horizontal diagonal bracing connecting plates, the two horizontal diagonal bracing U-shaped bolts connect the horizontal diagonal bracing connecting plates with the corner horizontal diagonal bracing through corresponding horizontal diagonal bracing connecting nuts, the upper and lower parts of the tripod supporting plates are respectively provided with a third through hole, threaded holes matched with the adjusting bolts are arranged at the third through holes, one end of each adjusting bolt is hinged with the adjusting supporting plate through a spherical hinge mode after passing through the corresponding threaded holes in the tripod supporting plates, the adjusting bolts can be rotated to correspondingly adjust the supporting plates, so that the adjusting support plate is attached to the side surface of the lattice column.
3. The construction method for the small ultra-deep foundation pit using the front-mounted steel support system according to claim 2, wherein the bearing tripod comprises two tripod vertical rods, two tripod horizontal rods, two tripod diagonal rods and three tripod cross rods, the tripod vertical rods, the tripod horizontal rods and the tripod diagonal rods are connected to form a tripod structure, the end parts of the two tripod structures are respectively connected through the three tripod cross rods, the horizontal diagonal connecting plates are arranged on the upper part of the bearing tripod, the horizontal diagonal connecting plates are respectively and rigidly connected with the tripod horizontal rods and the tripod cross rods, and the tripod vertical rods and the tripod cross rods are respectively and rigidly connected with the tripod support plate, so that the bearing tripod is supported on the tripod support plate.
4. The construction method for a small ultra-deep foundation pit using a front-mounted steel support system according to claim 2, wherein each of the adjusting support plates is hinged with three adjusting bolts, and the three adjusting bolts are arranged at equal intervals along the horizontal direction.
5. The construction method for the small ultra-deep foundation pit with the front-mounted steel support system according to claim 1, wherein the steel enclosing purlin of the front-mounted steel support comprises a plurality of straight section steel beams and four L-shaped corner steel beams, the straight section steel beams are assembled to form four strip steel beams in a bolt connection mode, the end parts of the four strip steel beams are connected to form a rectangular steel enclosing purlin in the L-shaped corner steel beams, the strip steel beams are connected with the corresponding L-shaped corner steel beams in the bolt connection mode, two ends of the corner horizontal diagonal bracing are connected with the inner side wall of the steel enclosing purlin through corner horizontal diagonal bracing connecting sections respectively, each corner of the steel enclosing purlin is provided with a plurality of parallel corner horizontal diagonal bracing, two parallel corner horizontal diagonal bracing positioned on the inner side are provided with a plurality of connecting beams, and a scaffold plate is paved on the corner horizontal diagonal bracing as an operation platform.
6. The construction method for the small ultra-deep foundation pit using the front-mounted steel support system according to claim 1, wherein the connecting beam comprises a connecting beam steel beam and two connecting beam end connecting plates, the two connecting beam end connecting plates are fixedly arranged at two ends of the connecting beam steel beam, through holes for the connecting beam U-shaped bolts to pass through are formed in the two connecting beam end connecting plates, and the corresponding corner horizontal diagonal braces of the connecting beam U-shaped bolt hoops are fixed on the corresponding connecting beam end connecting plates through connecting beam connecting nuts.
7. The construction method for the small ultra-deep foundation pit with the preposed steel support system according to claim 1, wherein the corner horizontal diagonal bracing comprises a gusset steel beam, two gusset end connection plates and a plurality of gusset leg connection channel steels, the two gusset end connection plates are respectively fixedly arranged at two ends of the gusset steel beam, the gusset leg connection channel steels are symmetrically arranged on two side surfaces of the gusset steel beam in pairs at equal intervals along the longitudinal direction of the gusset steel beam, bolt holes for connecting corresponding corner horizontal diagonal bracing connection sections are formed in the two gusset end connection plates, and a plurality of bolt holes for connecting corresponding adjustable support legs are formed in the gusset connection channel steels at intervals.
8. The construction method for the small ultra-deep foundation pit with the preposed steel support system according to claim 1, wherein the corner horizontal diagonal bracing connecting section comprises a connecting section steel beam, a connecting section angle brace connecting plate and a connecting section steel enclosing purlin connecting plate, the connecting section angle brace connecting plate and the connecting section steel enclosing purlin connecting plate are respectively and just connected to two ends of the connecting section steel beam, the connecting section steel enclosing purlin connecting plate is obliquely arranged, the connecting section angle brace connecting plate is vertically arranged, bolt holes for connecting the steel enclosing purlin are formed in the connecting section steel enclosing purlin connecting plate, and bolt holes for connecting corresponding corner horizontal diagonal bracing are formed in the connecting section angle brace connecting plate.
9. The construction method of the small ultra-deep foundation pit with the front-mounted steel support system according to claim 1, wherein the cross section of the straight section steel beam is in a double-web H shape and is formed by fixedly connecting a straight section steel beam web with straight section steel beam flange plates on two sides; the cross section of the L-shaped corner steel beam is double-web H-shaped, and the L-shaped corner steel beam is formed by fixedly connecting an L-shaped corner steel beam web with L-shaped corner steel beam flange plates on the inner side and the outer side; and holes are formed in the web plate of the L-shaped corner steel beam, the steel strand anchorage devices are arranged at the holes, and stiffening plates are respectively arranged at two sides of the steel strand anchorage devices.
10. The construction method for the small ultra-deep foundation pit with the preposed steel support system according to claim 1, wherein the servo oil cylinder comprises an oil cylinder sleeve, an adjusting cushion block, sleeve hook rollers and an oil cylinder body, the oil cylinder body is arranged in the oil cylinder sleeve, one end of the oil cylinder sleeve is provided with a vertical end plate, an adjusting cushion block for adjusting the total elongation of the servo oil cylinder is arranged in the oil cylinder sleeve, the adjusting cushion block is arranged between the vertical end plate and the oil cylinder body, the upper end of the vertical end plate is provided with a sleeve hook which is downwards opened and is used for being hung against a steel purlin, a plurality of sleeve hook rollers are arranged between the vertical end plate and the sleeve hook, and bolt holes for connecting the steel purlin are formed in the vertical end plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310130413.0A CN116335149A (en) | 2023-02-17 | 2023-02-17 | Construction method of small ultra-deep foundation pit by using front-mounted steel support system |
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| CN202310130413.0A CN116335149A (en) | 2023-02-17 | 2023-02-17 | Construction method of small ultra-deep foundation pit by using front-mounted steel support system |
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