CN109356196B - Method and structure for erecting and supporting steel supports of foundation pit of half-cover subway digging station - Google Patents
Method and structure for erecting and supporting steel supports of foundation pit of half-cover subway digging station Download PDFInfo
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- CN109356196B CN109356196B CN201811388832.XA CN201811388832A CN109356196B CN 109356196 B CN109356196 B CN 109356196B CN 201811388832 A CN201811388832 A CN 201811388832A CN 109356196 B CN109356196 B CN 109356196B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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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 provides a method and a structure for erecting and supporting a steel support of a foundation pit of a half-cover subway digging station. The erection structure comprises a foundation pit support structure, a cover laying structure, a first steel support, a second steel support and a steel support erected side by side with the first steel support and supported, the erection of the steel support and the support is to weld the steel supports and support the supports at two ends of the first steel support at first, then the inclination angle and the weight of the counterweight of the steel support are selected through calculation, the counterweight is hung at one end of the steel support and supported through a steel wire lifting rope, the steel support and the support are hung into the foundation pit from the uncovered area of the foundation pit opening, after the steel support and the support completely enter the foundation pit, the steel support and the support are in a horizontal state through the effect of the support, and two ends of the steel support are arranged on the steel support and the support. The invention solves the problems of difficult erection and high safety risk of the existing semi-covered excavated subway station, can facilitate the erection of steel supports and supports, cancels support replacement and reduces the influence of support replacement installation and disassembly on the construction period.
Description
Technical Field
The invention belongs to the technical field of subway station construction, and particularly relates to a method and a structure for erecting and supporting a foundation pit steel support of a half-cover subway digging station.
Background
In the construction method for constructing large-scale underground projects such as subway stations or underground parking lots in downtown areas with busy traffic, the open cut method has the advantages of simple construction process, high construction efficiency, low engineering cost and the like, but greatly interferes with surrounding traffic conditions, and is not suitable for urban areas with dense traffic. The cover excavation method is a method of excavating downwards from the ground to a certain depth, sealing the top and constructing the rest of lower engineering under the sealed top cover. The cover-excavation method has little influence on the surrounding traffic environment, but has the defects of complex construction process, low construction efficiency, high engineering cost and the like. Based on different characteristics of an open cut method and a cover cut method, in order to solve the contradiction between urgent requirements of construction land and construction period of an urban subway station and ground traffic and surrounding environment, a half cover cut construction method combining the open cut method and the cover cut method is provided, namely, a part of cover plate is firstly made to serve as a part of traffic and construction channel, and then the lower part is excavated.
At present, a Chinese subway station mostly adopts a concrete structure support, a steel support and a steel support replacement support as an inner support structure of a foundation pit; in order to reduce the influence of replacement support installation and disassembly on the construction period, the internal support structure of part of subway stations is optimized, replacement support is cancelled, and a steel support is additionally erected and supported at the interval of the first steel support. And in the construction of half-paved station, because of the influence of original first steel shotcrete tie beam and lapping plate, the steel shotcrete props and can't the level and transfer, and can't take mechanical equipment to cooperate in the station to the strut establishes the degree of difficulty height, implements the difficulty, and the safety risk is great, so can not erect the steel shotcrete and prop.
Disclosure of Invention
The invention provides a method and a structure for erecting and supporting a steel support of a half-cover subway digging station according to the defects of the prior art, wherein the erecting structure can be used for quickly and conveniently erecting and supporting the steel support by combining the erecting method, so that the influence of support replacement, installation and disassembly on the construction period is reduced, the construction difficulty is reduced, and the construction risk is reduced.
The invention provides a method for erecting and supporting a steel support of a foundation pit of a half-cover subway digging station, which is characterized by comprising the following specific steps of:
(1) a pair of steel support and support seats are correspondingly welded at the sides of two end parts of an original first steel support of a subway station foundation pit, the steel support and support seats are welded on a steel enclosing purlin of the first steel support, and the height of a support surface of each support seat is flush with the height of the bottom surface of the first steel support;
(2) splicing and supporting steel supports on the ground according to the size of the foundation pit;
(3) determining a hoisting inclination angle and a hoisting point, wherein the inclination angle is obtained according to the length of the steel support and the width of the area of the foundation pit where the cover plate is not arranged, so as to ensure that the steel support and the support can be hoisted into the foundation pit under the inclination angle, the hoisting point is arranged at the joint of the pipe joints, and a hoisting rope is fixed at the hoisting point;
(4) calculating the weight of the counterweight, wherein in order to enable the steel support to be in a balanced state when in a horizontal state, the bending moment Mo at the hanging point of the steel support is 0, and the weight of the counterweight is calculated according to the following formula:
wherein q is the gravity of the steel support and supporting unit length; g0Is the weight of the counterweight; g1The difference value between the movable end pipe joint and the gravity of unit length is obtained; g2The difference value between the fixed end pipe joint and the gravity of the unit length is shown, L is the length of the steel support and support, L' is the distance from the lifting point of the steel support and support to the steel support and support end without the assembled weight;
(5) the counterweight is installed at one end of the steel support and support through a steel wire lifting rope, the steel wire lifting rope consists of two steel wire ropes with different lengths, wherein the longer one is used as a main steel wire lifting rope, the shorter one is used as an auxiliary steel wire lifting rope, one end of the main steel wire lifting rope is fixed on the counterweight, the other end of the main steel wire lifting rope is fixed on the steel support and support, one end of the auxiliary steel wire lifting rope is fixed on the counterweight, the other end of the auxiliary steel wire lifting rope is tied on the main steel wire lifting rope, and the auxiliary steel wire lifting rope is in a loose state;
(6) hoisting the steel support and the support, namely simultaneously hoisting by adopting two lifting hooks, connecting a main lifting hook with the lifting rope at the position of the steel support and the support lifting point determined in the step (3), connecting an auxiliary lifting hook with the auxiliary steel wire lifting rope on the counterweight, lifting the main lifting hook to separate the steel support and the support from the ground, lifting the auxiliary lifting hook to bear the weight of the counterweight, inclining the steel support and the support to a set inclination, and then operating a crane to hoist the steel support and the support to the foundation pit from the uncovered area of the foundation pit opening with the set inclination;
(7) after the steel support and the support completely enter the foundation pit, the auxiliary lifting hook is lowered, the counterweight acts on the end of the steel support and the support, and the steel support and the support are changed into a horizontal posture by utilizing the lever principle; then operating the crane, hoisting the steel support and supporting, simultaneously utilizing the cooperation of a traction rope to respectively place two ends of the steel support and supporting on the steel support and supporting bracket welded in the step (1), and finally simultaneously lowering the main lifting hook and the auxiliary lifting hook to enable the balance weight to completely act on the steel support;
(8) after the main lifting hook and the auxiliary lifting hook descend in place, manually removing the lifting rope at the main lifting hook to enable the lifting rope to be separated from the steel support and be supported, enabling the auxiliary steel wire lifting rope to penetrate through the auxiliary lifting hook, lifting the auxiliary lifting hook to enable the balance weight to act on the auxiliary steel wire lifting rope, removing the main steel wire lifting rope on the main balance weight, and finally lifting the main lifting hook and the auxiliary lifting hook to lift the balance weight and the supporting lifting rope out of the foundation pit;
(9) and applying prestress to the steel support by using the calibrated oil cylinder to a design value.
The method has the advantages that the inclination of the steel support and support lifting in the step (3) is 0.5-1, the minimum value of the inclination angle α meets the requirement that the tan α is equal to the clear distance between the steel support and the cover plate/the width of the half-paved open area, and the anti-skidding blocks are welded at the lifting points.
The invention has the following excellent technical scheme: when the balance weight is actually selected, the gravity G of the balance weight0Greater than the theoretical value G calculated in the step (4)0。
The invention provides a half-cover subway station foundation pit steel support and bracing structure, which comprises a foundation pit enclosure structure, a covering structure, a first steel support and a second steel support, wherein the covering structure is erected at a foundation pit opening and covers a half of a foundation pit, and the first steel support and the second steel support are erected in the foundation pit, and the structure is characterized in that: the erection structure also comprises a steel support parallel-bracing and parallel-bracing counterweight erected parallel to the first steel support, steel support parallel-bracing supports are arranged at two ends of the steel support parallel-bracing, and the steel support parallel-bracing supports are welded on the steel purlin of the first steel support; the parallel-bracing counterweight is hung at one end of the steel support parallel bracing through a steel wire lifting rope, the steel wire lifting rope comprises a main steel wire lifting rope and an auxiliary steel wire lifting rope, one end of the main steel wire lifting rope is fixed on the parallel-bracing counterweight, the other end of the main steel wire lifting rope is fixed on the steel support parallel bracing, one end of the auxiliary steel wire lifting rope is fixed on the parallel-bracing counterweight, and the other end of the auxiliary steel wire lifting rope is tied on the main steel wire lifting rope; the steel shotcrete props and is the slope form and hangs into the foundation ditch from the foundation ditch mouth uncovered region in, when the steel shotcrete props and props not complete entering foundation ditch, lift by crane vice steel wire lifting rope through hoisting accessory, it props the counter weight and acts on vice steel wire lifting rope, when the steel shotcrete props complete entering foundation ditch, loosen the hoisting accessory on the vice steel wire lifting rope, and under the action of gravity that props the counter weight, the steel shotcrete props and is in the horizontality, its both ends are arranged in the steel shotcrete and are propped on the support, and through the fixed chucking of chucking part.
The technical scheme provided by the invention is as follows: the two ends of the first steel support and the second steel support are respectively provided with a steel support, the two steel support supports of the first steel support and the second steel support are respectively welded on the steel enclosing purlins of the first steel support and the second steel support, and the two ends of the first steel support and the two ends of the second steel support are respectively arranged on the corresponding steel support supports and are fixedly clamped through clamping parts.
The technical scheme provided by the invention is as follows: the length of the main steel wire lifting rope is larger than that of the auxiliary steel wire lifting rope, and the auxiliary steel wire lifting rope is in a loose state.
According to the technical scheme, the steel support parallel-bracing support and the steel support are supports with the same structure, are made of steel plates with the thickness of 20mm, and particularly comprise L type supports and horizontal support plates which are arranged at the top of the L type supports and face opposite to the transverse support plates of the L type supports, wherein the horizontal support plates of the supports are arranged above the steel enclosing purlin and are welded with the steel enclosing purlin through the vertical support plates of the L type supports.
The technical scheme provided by the invention is as follows: the structure of paving includes many temporary support, crossbeam, vertically links roof beam and shop apron, many temporary support equidistance sets up the foundation ditch middle part, separates into two parts with the foundation ditch, and its many vertically links roof beam and many crossbeams and connects respectively at temporary support and one of them side foundation ditch enclosure top to form a braced frame, the shop apron grillage is established on braced frame.
The technical scheme provided by the invention is as follows: the foundation pit enclosure structure adopts an underground continuous wall, or a cast-in-situ bored pile, or a manual hole digging pile.
The technical scheme provided by the invention is as follows: the clamping components are respectively clamped on the wood wedges at two sides of the steel support and support, or the first steel support or the second steel support.
The invention has the advantages that:
(1) the invention solves the problem that the parallel support can not be erected in a semi-covered subway station, implements the scheme of canceling the steel support and replacing the support and increasing the steel support and the support, reduces the mounting and dismounting time of the steel support replacement, saves the construction period, reduces the steel support replacement lease and has good social benefit and economic benefit;
(2) the erecting method provided by the invention has the advantages that the steel support is erected and braced in the semi-covered station, the whole steel support can be erected, the steel support is put down and assembled in a segmented mode, the installation progress can be accelerated, the high-altitude operation of an operator during the connection of the steel support is avoided, and the steel support can be avoided to a certain extent and the risk of bracing is avoided;
the invention has simple structure and convenient construction, solves the problems of difficult erection and high safety risk of the existing semi-covered excavated subway station and bracing, can conveniently erect steel supports and bracing, cancels the bracing replacement, reduces the influence of the erection and disassembly of the bracing replacement on the construction period, and optimizes the support structure in the station.
Drawings
FIG. 1 is a schematic top view of the present invention;
FIG. 2 is a cross-sectional view AA of FIG. 1;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a side view of the present invention when installed in a parallel strut;
FIG. 5 is an enlarged view of portion B of FIG. 4;
FIG. 6 is an enlarged view of section C of FIG. 4;
FIG. 7 is a schematic view of the installation of the steel support of the present invention;
FIG. 8 is a schematic front view of the steel support pedestal of the present invention;
FIG. 9 is a schematic view of the connection of the steel support of the present invention to the steel support pedestal;
fig. 10 is a counterweight calculation balance diagram of the present invention.
In the drawing, 1-a foundation pit enclosing structure, 2-a steel purlin, 3-a steel support and support, 3-1-L type supports, 3-2-a horizontal support plate, 4-a second steel support, 5-a steel wire lifting rope, 5-1, 5-2-a main steel wire lifting rope and an auxiliary steel wire lifting rope, 6-a first steel support, 7-a steel support and support, 8-a covering structure, 8-1-a temporary support, 8-2-a cross beam, 8-3-a longitudinal connecting beam, 8-4-a covering plate, 9-a parallel supporting counterweight, 10-a steel connecting beam, 11-a clamping component, 12-a parallel supporting lifting rope and 13-a steel support.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The steel support and bracing structure in the construction of the half-cover subway digging station as shown in fig. 1, fig. 2 and fig. 3 comprises a foundation pit enclosure structure 1, a cover laying structure 8 erected at a foundation pit opening and covering a half of the foundation pit, a first steel support 6 and a second steel support 4 erected in the foundation pit, wherein the foundation pit enclosure structure adopts an underground continuous wall, a bored pile or a manual hole digging pile. The cover structure 8 comprises a plurality of temporary pillars 8-1, cross beams 8-2, longitudinal connecting beams 8-3 and cover plates 8-4, the temporary pillars 8-1 are arranged in the middle of the foundation pit at equal intervals, the foundation pit is divided into two parts, the longitudinal connecting beams 8-3 and the cross beams 8-2 are respectively connected to the temporary pillars and the top of the foundation pit enclosure on one side of the temporary pillars, a supporting frame is formed, the cover plates 8-4 are erected on the supporting frame, and one half of the foundation pit is covered to form a half-cover construction structure. The erection structure further comprises a steel support parallel-bracing 7 and a parallel-bracing counterweight 9 which are erected side by side with the first steel support 6, as shown in fig. 3, the parallel-bracing counterweight 9 is hung at one end of the steel support parallel-bracing 7 through a steel wire lifting rope 5, steel support parallel-bracing supports 3 are arranged at two ends of the steel support parallel-bracing 7, and the steel support parallel-bracing supports 3 are welded on the steel purlin 2 of the first steel support 6; the steel support and support 7 is hung into the foundation pit from the uncovered area of the foundation pit opening in an inclined shape, when the steel support and support 7 does not completely enter the foundation pit, the support counterweight 9 is in a loose state, the steel support and support 7 is not stressed, after the steel support and support 7 completely enters the foundation pit, the steel support and support 7 is in a horizontal state under the action of gravity of the support counterweight 9, as shown in fig. 4 and 7, two ends of the steel support and support 7 are arranged on the steel support and support 3 and are fixedly clamped through a clamping component 11, as shown in fig. 9, the clamping component 11 is a wood wedge clamped at two sides of the steel support and support 7, and the wood wedge is tightly knocked through tools such as a hammer.
As shown in fig. 2 and 4, steel support supports 13 are arranged at two ends of the first steel support 6 and the second steel support 4, the two steel support supports 13 of the steel supports are respectively welded on the steel purlins 2 of the first steel support 6 and the second steel support 4, two ends of the first steel support 6 and two ends of the second steel support 4 are respectively arranged on the corresponding steel support supports 13 and are fixedly clamped through clamping components 11, the clamping components 11 are wood wedges respectively clamped at two sides of the first steel support 6 or the second steel support 4, and the wood wedges are tightly knocked through tools such as hammers.
As shown in fig. 6, the steel wire lifting rope 5 includes a main steel wire lifting rope and an auxiliary steel wire lifting rope, wherein one end of the main steel wire lifting rope is fixed on and supported by the counterweight 9, the other end of the main steel wire lifting rope is fixed on and supported by the steel support 7, one end of the auxiliary steel wire lifting rope is fixed on and supported by the counterweight 9, the other end of the auxiliary steel wire lifting rope is tied on the main steel wire lifting rope, when the steel support 7 does not completely enter the foundation pit, the auxiliary steel wire lifting rope is lifted by the lifting device to enable the counterweight 9 to act on the auxiliary steel wire lifting rope, and when the steel support 7 completely enters the foundation pit, the lifting device on the auxiliary steel wire lifting rope is released to enable the counterweight 9 to completely act.
The steel support and support seat 3 and the steel support seat 13 are both made of steel plates with the thickness of 20mm, have the same structure, and particularly comprise an L type seat 3-1 and a horizontal support plate 3-2 which is arranged at the top of the L type seat 3-1 and is opposite to the direction of a transverse support plate of the L type seat, wherein the horizontal support plate 3-2 of the steel support and support seat 3 is arranged above the steel purlin 2, and is welded with the steel purlin 2 through a vertical support plate of the L type seat 3-1.
The invention is further explained by combining the embodiment, the embodiment is a subway station, the width of the foundation pit is 23300mm, the width in the non-covering range is 10650mm, the distance between the support center and the bottom of the crown beam is 5770mm, and the support length is 22355 mm; in the steel support parallel bracing, when the steel support parallel bracing is not placed in place, the steel wire rope of the steel support hoisting point is clamped at the half-paved position and cannot be placed, so that the optimized scheme of canceling the support replacement and increasing the steel support parallel bracing cannot be implemented in the half-covered excavation station. In order to solve the problems, the project adopts the parallel bracing method in the invention, in order to keep the steel support parallel bracing consistent with the original first steel support and second steel support, when the original first steel support and second steel support are erected, steel support supports 13 are respectively added at two ends of the original first steel support and second steel support, and the concrete erection method of the parallel bracing is as follows:
(1) installing a steel support and support base 3 for erecting a steel support and support 7 at a steel purlin 2 of an original first steel support 6 of a subway station, wherein the welding position of the steel support and support base 3 is parallel to the first steel support 6, so that the installation of the steel support and support 7 is facilitated;
(2) according to the size calculation of the foundation pit half-cover structure, the inclination is minimum 0.54, for implementation, the actual value is 0.65, the lifting point is arranged at the pipe joint connecting position (approximately located at 0.7 times the length of the steel support), and anti-slipping measures are welded at the lifting point;
(3) one end of the lifting rope penetrates through a lifting point of the steel support and support 7, and the other end of the lifting rope is firmly connected with a main lifting hook of the crane;
(4) installing a counterweight, as shown in fig. 1, wherein T is the pulling force of the crane when the steel support is adjusted to be in a horizontal state; in order to make the steel support be in a balanced state when in a horizontal state, the bending moment Mo at the hanging point is 0, and the counterweight can be calculated according to the following formula:
the length of the steel support is 22.02m, the length of the piping adopts a fixed end (1.2m, 0.414t)0.25m pipe joint (0.185t) +6m pipe joint (1.531t) 3+ + movable end (2.59m, 1.034t), the mass q per unit length is 0.26t/m, the length of the piping adopts a fixed end (1.2m, 0.414t)0.25m pipe joint (0.185t) +6m pipe joint (1.531t) 3+ + movable end (2.59m, 1.034t), the G4 is 0.414+0.185- (1.2+0.25) 0.26t, the G5 is the difference between the movable end and the short joint, the G5 is the length of the fixed end, the G31 t, the G5 t is 0.2 +0.25) 0.26t, the G5 t is the difference between the movable end and the short joint (4832.25) 0.26t, the actual weight of the fixed end is 0.361t, the weight is calculated as the minimum length of the short joint (0.361, the weight of the counterweight is 0.361t, the counterweight is 0.9, the actual weight of the fixed end, the counterweight is 0.590.361 t, the counterweight is calculated as the minimum weight of the unit length of the fixed end, the counterweight is 0.9, the minimum weight of the counterweight is 0.361, the counterweight is 0.;
(5) installing a counterweight, namely installing a counterweight 9 by using a steel wire lifting rope 5, wherein the steel wire lifting rope 5 comprises a main steel wire lifting rope and an auxiliary steel wire lifting rope, the main steel wire lifting rope 5-1 is longer than the auxiliary steel wire lifting rope 5-2, the auxiliary steel wire lifting rope 5-2 is used as an auxiliary steel wire rope, and as a measure for removing the counterweight, the main steel wire lifting rope 5-1 penetrates through the counterweight 9 and a steel support and support 7 and penetrates through an auxiliary lifting hook of a crane, the auxiliary steel wire lifting rope 5-2 penetrates through the counterweight and does not penetrate through the steel support and support, the auxiliary steel wire lifting rope 5-2 can be tied on the main steel wire lifting rope 5-1 by using a common rope, so that the auxiliary steel wire lifting rope is convenient to use at the back, but the auxiliary steel wire lifting rope 5;
(6) installing the steel support and support 7, as shown in fig. 4, lifting a main lifting hook to enable the steel support and support 7 to be separated from the ground, simultaneously lifting an auxiliary lifting hook to enable the auxiliary lifting hook to bear the weight of a counterweight 9 to enable the steel support and support 7 to be inclined to a set inclination, then operating a crane to place the steel support and support 7 into a foundation pit, lowering the auxiliary lifting hook to enable the counterweight to act on the end of the steel support, and enabling the steel support and support to be in a horizontal posture by utilizing a lever principle; operating the crane, and simultaneously placing the steel support and brace 7 on the steel support and brace support 3 by using the cooperation of the traction rope, and placing the steel support and brace 7 in place; then, the main lifting hook and the auxiliary lifting hook are lowered, so that the counterweight 9 completely acts on the steel support 7;
(8) and (3) removing the balance weight 9 and the lifting rope 12, removing the main lifting hook and the lifting rope 12, penetrating the auxiliary steel wire lifting rope 5-2 through the auxiliary lifting hook, lifting the auxiliary lifting hook to enable the balance weight to act on the auxiliary steel wire lifting rope 5-2, removing the main steel wire lifting rope 5-1, and finally lifting the main lifting hook and the auxiliary lifting hook to lift the balance weight 9 and the steel wire rope out of the foundation pit.
(9) And finally, applying prestress to the steel support by using the calibrated oil cylinder to a design value. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for erecting and supporting a steel support of a foundation pit of a half-cover subway digging station is characterized by comprising the following specific steps:
(1) a pair of steel support and support seats are correspondingly welded at the sides of two end parts of an original first steel support of a subway station foundation pit, the steel support and support seats are welded on a steel enclosing purlin of the first steel support, and the height of a support surface of each support seat is flush with the height of the bottom surface of the first steel support;
(2) splicing and supporting steel supports on the ground according to the size of the foundation pit;
(3) determining a hoisting inclination angle and a hoisting point, wherein the inclination angle is obtained according to the length of a steel support and the width of an open area of a half-covered excavation foundation pit, the inclination of the steel support and support hoisting is 0.5-1, the steel support and support can be guaranteed to be hoisted into the foundation pit under the inclination angle, the hoisting point is arranged at the joint of pipe joints, an anti-skid block is welded at the hoisting point, and a hoisting rope is fixed at the hoisting point;
(4) calculating the weight of the counterweight, wherein in order to enable the steel support to be in a balanced state when in a horizontal state, the bending moment Mo at the hanging point of the steel support is 0, and the weight of the counterweight is calculated according to the following formula:
Mo＝∫0 L-L'qLdL+(G0+G1)(L-L')-∫0 L'qLdL-G2L'＝0
wherein q is the gravity of the steel support and supporting unit length; g0Is the weight of the counterweight; g1The difference value between the movable end pipe joint and the gravity of unit length is obtained; g2The difference between the gravity of a fixed end pipe joint and a short joint and the gravity of unit length is represented by L, the length of a steel support and support is represented by L ', and the distance from a lifting point of the steel support and support to a steel support and support end without the assembled weight is represented by L';
(5) mounting a counterweight, wherein when the actual counterweight is selected, the gravity G0 of the counterweight is greater than the theoretical value G0 calculated in the step (4); the counterweight is arranged at one end of the steel support and support through a steel wire lifting rope, the steel wire lifting rope consists of two steel wire ropes with different lengths, wherein the longer one is used as a main steel wire lifting rope, the shorter one is used as an auxiliary steel wire lifting rope, one end of the main steel wire lifting rope is fixed on the counterweight, the other end of the main steel wire lifting rope is fixed on the steel support and support, one end of the auxiliary steel wire lifting rope is fixed on the counterweight, the other end of the auxiliary steel wire lifting rope is tied on the main steel wire lifting rope, and the auxiliary steel wire lifting rope is;
(6) hoisting the steel support and the support, namely simultaneously hoisting by adopting two lifting hooks, connecting a main lifting hook with the lifting rope at the position of the steel support and the support lifting point determined in the step (3), connecting an auxiliary lifting hook with the auxiliary steel wire lifting rope on the counterweight, lifting the main lifting hook to separate the steel support and the support from the ground, lifting the auxiliary lifting hook to bear the weight of the counterweight, inclining the steel support and the support to a set inclination, and then operating a crane to hoist the steel support and the support to the foundation pit from the uncovered area of the foundation pit opening with the set inclination;
(7) after the steel support and the support completely enter the foundation pit, the auxiliary lifting hook is lowered, the counterweight acts on the end of the steel support and the support, and the steel support and the support are changed into a horizontal posture by utilizing the lever principle; then operating the crane, hoisting the steel support and supporting, simultaneously utilizing the cooperation of a traction rope to respectively place two ends of the steel support and supporting on the steel support and supporting bracket welded in the step (1), and finally simultaneously lowering the main lifting hook and the auxiliary lifting hook to enable the balance weight to completely act on the steel support;
(8) after the main lifting hook and the auxiliary lifting hook descend in place, manually removing the lifting rope at the main lifting hook to enable the lifting rope to be separated from the steel support and be supported, enabling the auxiliary steel wire lifting rope to penetrate through the auxiliary lifting hook, lifting the auxiliary lifting hook to enable the balance weight to act on the auxiliary steel wire lifting rope, removing the main steel wire lifting rope on the main balance weight, and finally lifting the main lifting hook and the auxiliary lifting hook to lift the balance weight and the supporting lifting rope out of the foundation pit;
(9) and applying prestress to the steel support by using the calibrated oil cylinder to a design value.
2. The utility model provides a half lid digs subway station foundation ditch steel shotcrete and strut and establishes structure, includes foundation ditch retaining structure (1), erects at basic pithead and with the blanket structure (8) that half foundation ditch covers, erects first steel shotcrete (6) and second way steel shotcrete (4) in the foundation ditch, its characterized in that: the erection structure further comprises a steel support parallel support (7) and a parallel support counter weight (9) which are erected side by side with the first steel support (6), two ends of the steel support parallel support (7) are provided with steel support parallel support supports (3), and the steel support parallel support supports (3) are welded on a steel purlin (2) of the first steel support (6); the parallel-bracing counterweight (9) is hung at one end of the steel support parallel bracing (7) through a steel wire lifting rope (5), the steel wire lifting rope (5) comprises a main steel wire lifting rope (5-1) and an auxiliary steel wire lifting rope (5-2), one end of the main steel wire lifting rope (5-1) is fixed on the parallel-bracing counterweight (9), the other end of the main steel wire lifting rope is fixed on the steel support parallel bracing (7), one end of the auxiliary steel wire lifting rope (5-2) is fixed on the parallel-bracing counterweight (9), the other end of the auxiliary steel wire lifting rope is tied on the main steel wire lifting rope (5-1), the length of the main steel wire lifting rope (5-1) is greater than that of the auxiliary steel wire lifting rope (5-2), and the auxiliary steel wire lifting rope (5-2) is in a; the steel supports and supports (7) are inclined and hung into the foundation pit from the uncovered area of the foundation pit opening, when the steel supports and supports (7) do not completely enter the foundation pit, the auxiliary steel wire lifting rope (5-2) is lifted through the lifting device, the auxiliary steel wire lifting rope (5-2) acts on the auxiliary steel wire lifting rope (9) and supports the counterweight (9), when the steel supports and supports (7) completely enter the foundation pit, the lifting device on the auxiliary steel wire lifting rope (5-2) is loosened, under the action of gravity of the counterweight (9), the steel supports and supports (7) are in a horizontal state, two ends of the steel supports are placed on the steel supports and support the support (3), and the steel supports and supports are fixedly clamped through the clamping component (11).
3. The semi-covered subway station foundation pit steel supporting and bracing structure as claimed in claim 2, wherein: the steel support seat (13) are arranged at the two ends of the first steel support (6) and the second steel support (4), the steel support seats (13) of the two steel supports are respectively welded on the steel enclosing purlins (2) of the first steel support (6) and the second steel support (4), the two ends of the first steel support (6) and the second steel support (4) are respectively arranged on the corresponding steel support seats (13), and the two ends of the first steel support (6) and the second steel support (4) are fixedly clamped through the clamping component (11).
4. The semi-covered subway station foundation pit steel supporting and bracing structure according to claim 2 or 3, wherein: the cover laying structure (8) comprises a plurality of temporary pillars (8-1), cross beams (8-2), longitudinal connecting beams (8-3) and cover laying plates (8-4), the plurality of temporary pillars (8-1) are arranged in the middle of the foundation pit at equal intervals, the foundation pit is divided into two parts, the plurality of longitudinal connecting beams (8-3) and the plurality of cross beams (8-2) are respectively connected to the temporary pillars and the top of the foundation pit enclosure on one side of the temporary pillars, a supporting frame is formed, and the cover laying plates (8-4) are erected on the supporting frame.
5. The semi-covered subway station foundation pit steel supporting and bracing structure according to claim 2 or 3, wherein: the foundation pit enclosure structure adopts an underground continuous wall, or a cast-in-situ bored pile, or a manual hole digging pile.
6. The semi-cover excavation subway station foundation pit steel supporting and bracing structure as claimed in claim 2, wherein the steel supporting and bracing support (3) and the steel supporting support (13) are supports with the same structure, and both are composed of L type steel plate support (3-1) and horizontal support plate (3-2) which is arranged on top of L type steel plate support (3-1) and faces opposite to the transverse support plate of L type support, the horizontal support plate (3-2) of the support is arranged above the steel purlin (2), and is welded with the steel purlin (2) through the vertical steel plate of L type steel plate support (3-1).
7. The semi-covered subway station foundation pit steel supporting and bracing structure as claimed in claim 2, wherein: the clamping components (11) are respectively clamped on wood wedges at two sides of the steel support and support (7), the first steel support (6) or the second steel support (4).
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| CN201811388832.XA CN109356196B (en) | 2018-11-21 | 2018-11-21 | Method and structure for erecting and supporting steel supports of foundation pit of half-cover subway digging station |
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| CN201811388832.XA CN109356196B (en) | 2018-11-21 | 2018-11-21 | Method and structure for erecting and supporting steel supports of foundation pit of half-cover subway digging station |
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| CN2045336U (en) * | 1988-03-10 | 1989-10-04 | 西安冶金建筑学院 | Special-purpose equipment for making polygon spiral hoop |
| CN104140037B (en) * | 2014-07-29 | 2016-06-08 | 南京奥捷墙体材料有限公司 | Wallboard Lift-on/Lift-off System |
| CN106013241B (en) * | 2016-07-12 | 2018-06-08 | 中铁第一勘察设计院集团有限公司 | Guan Liang foundation trench uprightly performs and cap excavation method station integrated structure system and construction method |
| CN206916751U (en) * | 2017-06-30 | 2018-01-23 | 中国建筑第六工程局有限公司 | Horizontal bracing members have bad luck peace and tear constructing structure open below a kind of half base hole cover-digging cover plate |
| CN108487297B (en) * | 2018-03-01 | 2020-02-21 | 中铁隧道集团二处有限公司 | Construction method for erecting steel support in half-cover excavation construction of subway station |
| CN108331021A (en) * | 2018-03-22 | 2018-07-27 | 重庆建工第七建筑工程有限责任公司 | Half cap excavation method large span bedding structure of one kind and its construction method |
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