CN109680691B - Earth excavation method for annular support of foundation pit - Google Patents
Earth excavation method for annular support of foundation pit Download PDFInfo
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- CN109680691B CN109680691B CN201811586604.3A CN201811586604A CN109680691B CN 109680691 B CN109680691 B CN 109680691B CN 201811586604 A CN201811586604 A CN 201811586604A CN 109680691 B CN109680691 B CN 109680691B
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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
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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
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- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention discloses an earthwork excavation method for a foundation pit annular support, which relates to the technical field of building construction, and has the technical scheme that: excavating the foundation pit layer by layer, wherein the excavation comprises foundation pit dewatering, foundation pit 1 layer earthwork excavation, foundation pit 2 layer earthwork excavation, foundation pit 3 layer earthwork excavation and foundation pit bottom plate earthwork excavation; according to the excavation technology, the inclined trestle is adopted and the backfilling pond slag road is matched, so that an earth vehicle can directly go deep into any region excavated by the excavator in the foundation pit when each layer of earth is excavated, the frequency of dumping and transporting the slag soil is reduced, the earth excavation speed is accelerated, and meanwhile, the construction quality and the construction efficiency of earth excavation are improved.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to an earthwork excavation method of a foundation pit annular support.
Background
In the urban land planning of China, the land blocks which are approximately square occupy most, the support design of the deep foundation pit in the construction engineering of the urban soft soil region in east China at present starts to gradually adopt the foundation pit support system of the annular support, and because the annular support has a better stress state, compared with the traditional symmetrical support, the annular support has lower manufacturing cost under the same support effect, so the support form is certainly more popularized in the central area of the city.
Under the annular support system, the foundation pit earthwork must be excavated in layers according to the principle of the space effect, firstly supported and then excavated, and firstly annular support earthwork excavation is carried out to form annular support and then excavation of annular inner earthwork; at present, the earth excavation forms adopted in the deep foundation pit of the ring support system mainly comprise the following forms: one is to set up the landing stage plate form annular access on the first annular support of foundation ditch, the excavator excavates and dumps the soil in the foundation ditch, and load the unearthing through the platform of borrowing that the landing stage plate stretches into; and the other type is that when the annular support earthwork is excavated, an earthwork slope is reserved from the bottom of the foundation pit to the outside of the foundation pit, and the earthwork vehicle can enter the foundation pit through the earthwork slope to load soil, so that the soil dumping times of the excavator are reduced.
However, the two methods need to meet the condition that the circular ring support integrally forms a rear part capable of bearing force, the supporting part covered by the soil slope is excavated in advance before each support construction, and the part of soil body is backfilled, so that the soil slope can be used for excavating the layer of soil; therefore, the construction method is only suitable for annular support engineering with shallow foundation pit depth, and the construction time of the method is prolonged under the conditions of increased foundation pit depth and poor field soil quality, so that the construction quality and the construction efficiency of earth excavation are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the earthwork excavation method of the annular support of the foundation pit, which has the function of improving the construction quality and the construction efficiency of the earthwork excavation.
In order to achieve the purpose, the invention provides the following technical scheme:
the earthwork excavating method for the annular support of the foundation pit excavates the foundation pit layer by layer, and comprises the following steps: s1, dewatering of the foundation pit: adopting a sand pipe well for dewatering 20 days before the earth excavation, arranging the sand pipe well with the well distance smaller than 10m, and drilling a pressure reduction well at the periphery of the enclosure structure every 20 m; s2, excavating the earthwork of the 1 st layer of the foundation pit: firstly, excavating a ring support area, symmetrically excavating, then excavating a central island area, excavating and constructing a first section of trestle ramp and a ring support at the same time, conveying earthwork to the outside of a foundation pit through an earth outlet at the west side of the foundation pit, constructing a ring-shaped inner support structure of a current layer in the excavated area to support after the excavation is finished, wherein the ring-shaped inner support structure consists of a plurality of support units; s3, excavating the earthwork of the 2 nd layer of the foundation pit: firstly, arranging an earth outlet at the south side of a foundation pit and backfilling a pond slag road, then excavating earth in a second section of trestle ramp and a four-corner ring support region, enabling all earth vehicles to enter the pit through the pond slag road, loading the earth by an excavator, excavating the earth in a central island from far to near to the earth outlet at the south side, and constructing an annular inner support structure of the current layer in the excavated region for supporting after the excavation is finished; s4, excavating foundation pit layer 3 earthwork: firstly, a second section of trestle ramp is used as an earth taking channel, a slag road is arranged at a position away from a horizontal earth taking platform and extends to four corners of a foundation pit, the slag road is used as a travelling path for an earth vehicle to enter the foundation pit, an annular supporting area and the trestle horizontal earth taking platform are excavated and constructed at the same time, after the trestle horizontal earth taking platform is completed, the rest earthwork on the layer enters the trestle through the horizontal earth taking platform all around to be transported out of the earth, and after the excavation is completed, the annular inner supporting structure on the current layer is constructed in the excavated area to support the rest earthwork; s5, excavating earthwork of a base plate of the foundation pit: the method comprises the steps of firstly arranging pond slag roads at four corners of a foundation pit from a trestle horizontal platform, enabling an earthwork vehicle to be close to an excavating area of an excavator to take earth, then excavating the earthwork of a bottom plate in a partitioning mode, retreating and excavating towards the trestle platform, constructing earthwork below the trestle platform at last, parking a loading excavator around the horizontal earth taking platform, and transferring the earthwork below the platform into the earthwork vehicle to take out the earth outside the foundation pit through the trestle.
According to the arrangement, as the main components of the ring support system are arranged at the four corners and the peripheral area of the foundation pit, the central island type excavation method is suitable for being adopted, namely, firstly, earthwork excavation of the peripheral ring support area is carried out, and after the annular inner support structure is constructed, the outer central earthwork of the ring is excavated, so that the ring support system has the effect of stably supporting the foundation pit; the diagonal excavation of the ring bracing area is kept to ensure that the soil unloading in the foundation pit is symmetrical and uniform; the reinforced concrete trestle platform inclined to the pit bottom is arranged from the earth outlet at the outer side of the foundation pit to the middle part of the foundation pit, so that an earth vehicle can directly enter the side of an excavator in the foundation pit through the trestle platform, the excavator directly loads the earth and takes the earth out, the number of earth turnover is reduced, and the earth taking speed is accelerated; the excavation construction technology not only solves the key problem faced in the annular support deep foundation pit, but also has no influence on the stress of the annular support due to the load on the annular support system because the annular support system and the annular support system are independent, is favorable for the stability of the foundation pit, abandons the use of a long-arm excavator and reduces the earthwork excavation cost; the excavation technology relies on the inclined lower trestle type excavation technology arranged in the foundation pit, the problems of slow earth excavation, low mechanical use efficiency, large cost investment and the like of the central island can be effectively solved, the excavation technology has guiding and operability, and on the basis of the guiding and operability, the earth excavation mode under the annular support deep foundation pit can be more economic, safe and effective; through adopting oblique landing stage and being equipped with backfill pond sediment road, make every layer of earthwork excavation all can directly go deep into the arbitrary region of foundation ditch inside excavator excavation, reduce the sediment soil and transport the number of times for unearthing speed has the effect that improves the construction quality and the efficiency of construction of its earthwork excavation simultaneously.
Further setting: the supporting unit comprises an arc-shaped plate, a hollow pile anchor, a driving block, a connecting block and a bending rod, wherein the arc-shaped plate is abutted to the inner wall of the foundation pit, the hollow pile anchor is arranged on the end face of the foundation pit towards the arc-shaped plate, the threaded rod is rotatably arranged in the hollow pile anchor, the thread is rotatably arranged on the driving block, the connecting block is arranged on the driving block in a limiting sliding mode, one end of the connecting block is hinged to the bending rod on the connecting block, a yielding groove is formed in the side wall of the circumference of the hollow pile anchor, the bending part of the bending rod is hinged to the groove wall of the yielding groove, the other end of the bending rod is installed and sealed on.
According to the arrangement, when the hollow pile anchor is inserted into the side wall of the foundation pit, the driving block is in relative motion in the hollow pile anchor insertion by rotating the threaded rod, so that the bending rod is positioned on the abdicating groove to rotate, the abdicating groove is opened, and the bending rod is unfolded and inserted into the side wall of the foundation pit; the concrete slurry is injected into the hollow pile anchor through the grouting port, so that the concrete slurry is filled into the side wall of the foundation pit from the abdicating groove and is condensed with the side wall of the foundation pit, the effect of fixing the hollow pile anchor in the foundation pit is achieved, and the structural strength and the support stability of the support unit fixed on the foundation pit are improved.
Further setting: the driving block is provided with a guide rail along the length direction of the hollow pile anchor, a guide groove is formed in the connecting block, and the connecting block is arranged on the guide rail in a directional sliding mode through the guide groove.
So set up, when the drive block was in the removal of cavity stake anchor, made its connecting block pass through the guide way and be in the oriented slip on the guided way, relative stability when improving the motion between connecting block and the drive block, and then made its bending rod stable be in and step down the groove and rotate, reached the purpose of stable construction.
Further setting: the transversal isosceles trapezoid that personally submits of guided way sets up, and the integrative fixed connection of the last base and the drive block of guided way, and the both ends of guided way all are provided with the stopper, the stopper is with the integrative fixed connection of drive block.
Due to the arrangement, the connecting block can only displace along the length direction of the guide rail, so that the stability of the connecting block moving on the driving block is improved; meanwhile, the two ends of the guide rail are provided with limiting blocks to limit the range of the connecting block sliding on the guide rail, so that the rotation angle of the bending rod and the rotation performance during rotation can be better controlled.
Further setting: the groove of stepping down is counter bore form and arranges, the one end of bending the pole far away from being connected with the connecting block sets up to the boss form with groove matched with of stepping down.
So set up, make its bending rod when sealed in the notch of groove of stepping down, improve its area of contact between them, be convenient for simultaneously the bending rod stable mounting in the effect on the groove of stepping down.
Further setting: the threaded rod is provided with a plurality of driving blocks, and the driving blocks are connected with the bending rods.
Due to the arrangement, after the outer circumferential surface of the hollow pile anchor is constructed, the multi-bending rods are inserted into the side wall of the foundation pit in a multi-angle mode, the contact area and the stress area between the supporting unit and the foundation pit are increased, and the stability of the annular inner supporting structure supported in the foundation pit and the mounting structural strength are improved.
Further setting: the included angle direction of the bending rods and the direction of the hollow pile anchor inserted in the foundation pit are arranged in the opposite direction.
So set up, when the arc atress, the effort that makes its bending rod receive is reverse with the power that the foundation ditch formed to the arc, improves the adhesive force that bending rod acted on the foundation ditch lateral wall, and then improves mounting structure intensity and construction stability between supporting element and the foundation ditch.
Further setting: the bending rods are arranged in a plurality of numbers, and the bending rods are arranged on the circumferential surface of the driving block in a circumferential shape.
Due to the arrangement, after the outer circumferential surface of the hollow pile anchor is constructed, the bending rods are inserted into the side wall of the foundation pit in multiple sections, the contact area and the stress area between the supporting unit and the foundation pit are increased, and the stability of the annular inner supporting structure supported in the foundation pit and the mounting structural strength are improved.
Further setting: one end of the hollow pile anchored in the direction of the foundation pit is pointed.
So set up, be convenient for the cavity stake anchor peg graft in the lateral wall of foundation ditch, reach the purpose of being convenient for operate.
Further setting: the end face, facing the bottom of the foundation pit, of the arc plate is provided with a containing cavity, an extending plate is arranged in the containing cavity in a sliding mode, a stroke groove is formed in the end face, deviating from the side wall of the foundation pit, of the arc plate, the stroke groove is communicated with the containing cavity, an operation block is fixedly connected to the extending plate, and the operation block is arranged on the stroke groove in a sliding mode and protrudes out of a notch of the stroke groove.
So set up, when the arc was installed on the lateral wall of foundation ditch, outside sliding out the stroke groove with the extension board through the drive operation piece, and plug in the basement of foundation ditch, improve the lifting surface area that the arc supported in the foundation ditch, improve the structural strength of its annular inner support structure support stability and installation in the foundation ditch.
Compared with the prior art, the invention has the following advantages by adopting the technical scheme:
1. by adopting the earthwork excavation technology, the problem that the earthwork of the central island under the annular support is difficult to take the earthwork is solved, and simultaneously, each layer of earthwork can be directly transported out through the earthwork vehicle, so that the frequency of transporting the earthwork of the excavator is reduced, and the earthwork excavation construction period is effectively shortened;
2. when the hollow pile anchor is inserted into the side wall of the foundation pit, the driving block is relatively moved in the hollow pile anchor insertion by rotating the threaded rod, so that the bending rod is positioned on the abdicating groove to rotate, the abdicating groove is opened, and the bending rod is unfolded and inserted into the side wall of the foundation pit; the concrete slurry is injected into the hollow pile anchor through the grouting port, so that the concrete slurry is filled into the side wall of the foundation pit from the abdicating groove and is condensed with the side wall of the foundation pit, the effect of fixing the hollow pile anchor in the foundation pit is achieved, and the structural strength and the support stability of the support unit fixed on the foundation pit are improved;
3. when the arc plate is installed on the side wall of the foundation pit, the extension plate is slid out of the stroke groove through the driving operation block and is plugged in the base of the foundation pit, and the support stability of the arc plate in the foundation pit is improved.
Drawings
FIG. 1 is a schematic view of an earthwork structure of a foundation pit annular support;
FIG. 2 is a schematic structural view of an annular inner support structure;
FIG. 3 is a schematic view of a support unit;
FIG. 4 is a schematic structural view of a hollow pile anchor in the support unit;
FIG. 5 is a partial cross-sectional view of a hollow pile anchor in the support unit;
fig. 6 is an enlarged view of a portion a in fig. 5.
In the figure: 1. an annular inner support structure; 2. a support unit; 21. an arc-shaped plate; 211. a grouting port; 212. an accommodating chamber; 213. a stroke slot; 22. a hollow pile anchor; 221. a yielding groove; 23. a threaded rod; 24. a drive block; 241. a guide rail; 25. connecting blocks; 251. a guide groove; 26. bending the rod; 27. a limiting block; 28. an extension plate; 281. and an operation block.
Detailed Description
The method for excavating the earthwork of the annular support of the foundation pit is further explained with reference to the attached drawings.
An earthwork excavation method for a foundation pit annular support is carried out by adopting a layer-by-layer excavation mode for the foundation pit, as shown in figure 1, and comprises the following steps:
s1, dewatering of the foundation pit: and (3) dewatering by adopting a sand pipe well 20 days before the earth excavation, arranging the sand pipe wells with the well spacing smaller than 10m, and drilling a pressure reduction well every 20m on the periphery of the enclosure structure.
S2, excavating the earthwork of the 1 st layer of the foundation pit: firstly, excavating a ring bracing area, symmetrically excavating, and then excavating a central island area; the first section of trestle ramp and the annular support are excavated and constructed at the same time, and earthwork is conveyed to the outside of the foundation pit through an earth outlet at the west side of the foundation pit; after the excavation is finished, as shown in fig. 2, the annular inner supporting structure 1 of the current layer is constructed in the excavated area and is supported, and the annular inner supporting structure 1 is formed by mutually attaching a plurality of supporting units 2.
Referring to fig. 3 to 5, wherein the supporting unit 2 includes an arc plate 21 abutting against the inner wall of the foundation pit, a hollow pile anchor 22 disposed on the end surface of the foundation pit facing the arc plate 21, a threaded rod 23 having two ends disposed in the hollow pile anchor 22 in an idle manner, a plurality of driving blocks 24 disposed on the threaded rod 23 in an equidistant manner along the length direction of the threaded rod 23 and in a threaded rotation manner, a plurality of connecting blocks 25 slidably disposed on the circumferential surface of the driving blocks 24 in an equidistant manner, and bending rods 26 having one ends respectively hinged to the connecting blocks 25 in a one-to-one correspondence manner, one end of the hollow pile anchor 22 in the direction of the foundation pit is set to be pointed, and the other.
As shown in fig. 3 to 5, the driving block 24 is provided with a plurality of guide rails 241 along the length direction of the hollow pile anchor 22, and the plurality of guide rails 241 are circumferentially and equidistantly arranged on the circumferential surface of the hollow pile anchor 22; the cross section of the guide rail 241 is in an isosceles trapezoid shape, the upper bottom edge of the guide rail 241 is fixedly connected with the driving block 24 integrally, the connecting blocks 25 are provided with guide grooves 251 matched with the guide rail 241, and the connecting blocks 25 are in one-to-one correspondence to the guide rails 241 through the guide grooves 251 to directionally slide.
Referring to fig. 5 and 6, the two ends of the guide rail 241 are provided with the limiting blocks 27, and the limiting blocks 27 are integrally and fixedly connected with the driving block 24, so that the connecting block 25 is limited to slide on the driving block 24, and the bending rod 26 is circumferentially arranged on the circumferential surface of the driving block 24.
Referring to fig. 5 and 6, an abdicating groove 221 is formed on the circumferential side wall of the hollow pile anchor 22, and the bending portion of the bending rod 26 is hinged to the groove wall of the abdicating groove 221; the abdicating groove 221 is arranged in a counter bore shape, one end of the bending rod 26, which is far away from the connecting block 25, is arranged in a boss shape matched with the abdicating groove 221, in an initial state, the other end of the bending rod 26 is installed and sealed on the abdicating groove 221, and the outer end face of the bending rod 26 at the end is arranged in parallel and level with the circumferential face of the hollow pile anchor 22.
As shown in fig. 5 and 6, the arc plate 21 is provided with a grouting opening 211, when the hollow pile anchor 22 is inserted into the side wall of the foundation pit, the driving block 24 is positioned in the insertion of the hollow pile anchor 22 and moves relatively by rotating the threaded rod 23, so that the bending rod 26 is positioned on the abdicating groove 221 to rotate, the abdicating groove 221 is opened, and the bending rod 26 is unfolded and inserted into the side wall of the foundation pit; the concrete slurry is injected into the hollow pile anchor 22 through the grouting port 211, and is made to condense with the concrete slurry in the side wall of the foundation pit from the abdicating groove 221, so that the hollow pile anchor 22 is fixed in the foundation pit, and the structural strength and the support stability of the support unit 2 fixed on the foundation pit are improved.
Referring to fig. 5 and 6, in order to improve the stability of the bending rod 26 inserted into the sidewall of the foundation pit, the included angle direction of the bending rod 26 and the direction of the hollow pile anchor 22 inserted into the foundation pit are arranged in the opposite direction; meanwhile, an accommodating cavity 212 is formed in the end face, facing the bottom of the foundation pit, of the arc-shaped plate 21, an extending plate 28 is arranged in the accommodating cavity 212 in a sliding mode, a stroke groove 213 is formed in the end face, facing away from the side wall of the foundation pit, of the arc-shaped plate 21, the stroke groove 213 is communicated with the accommodating cavity 212, an operating block 281 is fixedly connected to the extending plate 28, and the operating block 281 is arranged on the stroke groove 213 in a sliding mode and protrudes out of a notch of the stroke groove 213; when the arc plate 21 is installed on the sidewall of the foundation pit, the extension plate 28 is slid out of the stroke slot 213 by driving the operation block 281 and is inserted into the base of the foundation pit, so that the support stability of the arc plate 21 supported in the foundation pit is improved.
S3, excavating the earthwork of the 2 nd layer of the foundation pit: firstly, arranging an earth outlet at the south side of a foundation pit and backfilling a pond slag road, then excavating earthwork of a second section of trestle ramp and a four-corner ring support region, enabling all earthwork vehicles to enter the pit through the pond slag road, loading the earthwork vehicles by an excavator to remove the earth, and retreating and excavating the earthwork of a central island from a far side to a near side at the earth outlet at the south side; after the excavation is finished, constructing an annular inner supporting structure 1 of the current layer in the excavated area for supporting; and the upper end of the arc-shaped plate 21 in the layer of annular inner supporting structure 1 is in fit arrangement with the lower end face of the arc-shaped plate 21 excavated in the layer 1 of earthwork of the foundation pit.
S4, excavating foundation pit layer 3 earthwork: firstly, a second section of trestle ramp is used as an earth taking channel, a slag road is arranged at a position away from a horizontal earth taking platform and extends to four corners of a foundation pit, the slag road is used as a travelling path for an earth vehicle to enter the foundation pit, an annular supporting area and the trestle horizontal earth taking platform are excavated and constructed at the same time, after the trestle horizontal earth taking platform is completed, the rest earthwork on the layer enters the trestle through the horizontal earth taking platform all around to be transported out of the earth, and after the excavation is completed, an annular inner supporting structure on the current layer is constructed in the excavated area to support the rest earthwork; and the upper end of the arc-shaped plate 21 in the layer of annular inner supporting structure 1 is in fit arrangement with the lower end face of the arc-shaped plate 21 excavated in the foundation pit layer 2 earthwork.
S5, excavating earthwork of a base plate of the foundation pit: the method comprises the steps of firstly arranging pond slag roads at four corners of a foundation pit from a trestle horizontal platform, enabling an earthwork vehicle to be close to an excavating area of an excavator to take earth, then excavating the earthwork of a bottom plate in a partitioning mode, retreating and excavating towards the trestle platform, constructing earthwork below the trestle platform at last, parking a loading excavator around the horizontal earth taking platform, and transferring the earthwork below the platform into the earthwork vehicle to take out the earth outside the foundation pit through the trestle.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The earth excavation method for the annular support of the foundation pit is characterized by excavating the foundation pit layer by layer, and comprises the following steps:
s1, dewatering of the foundation pit: adopting a sand pipe well for dewatering 20 days before the earth excavation, arranging the sand pipe well with the well distance smaller than 10m, and drilling a pressure reduction well at the periphery of the enclosure structure every 20 m;
s2, excavating the earthwork of the 1 st layer of the foundation pit: firstly, excavating a ring support area, symmetrically excavating, then excavating a central island area, excavating and constructing a first section of trestle ramp and a ring support at the same time, conveying earthwork to the outside of a foundation pit through an earth outlet at the west side of the foundation pit, constructing a ring-shaped inner support structure (1) of the current layer in the excavated area to support after the excavation is finished, wherein the ring-shaped inner support structure (1) consists of a plurality of support units (2); the supporting unit (2) comprises an arc-shaped plate (21) abutted to the inner wall of the foundation pit, a hollow pile anchor (22) arranged on the end face of the arc-shaped plate (21) facing the foundation pit, a threaded rod (23) rotatably arranged in the hollow pile anchor (22), a driving block (24) rotatably arranged on the threaded rod (23) in a threaded manner, a connecting block (25) arranged on the driving block (24) in a limiting and sliding manner, and a bending rod (26) with one end hinged to the connecting block (25), wherein a yielding groove (221) is formed in the circumferential side wall of the hollow pile anchor (22), the bending part of the bending rod (26) is rotatably arranged in the yielding groove (221), the other end of the bending rod (26) is installed and sealed on the yielding groove (221) in the initial state, and a grouting port (211) is formed in the arc-shaped plate (21); a guide rail (241) is arranged on the driving block (24) along the length direction of the hollow pile anchor (22), a guide groove (251) is arranged on the connecting block (25), and the connecting block (25) is directionally and slidably arranged on the guide rail (241) through the guide groove (251);
s3, excavating the earthwork of the 2 nd layer of the foundation pit: firstly, arranging an earth outlet at the south side of a foundation pit and backfilling a pond slag road, then excavating earth in a second section of trestle ramp and a four-corner ring support region, enabling all earth vehicles to enter the pit through the pond slag road, loading the earth by an excavator, excavating the earth in a central island from far to near to the earth outlet at the south side, and after the excavation is finished, constructing an annular inner support structure (1) of the current layer in the excavated region for supporting;
s4, excavating foundation pit layer 3 earthwork: firstly, a second section of trestle ramp is used as an earth taking channel, a slag road is arranged at a position away from a horizontal earth taking platform and extends to four corners of a foundation pit, the slag road is used as a travelling crane route for an earth vehicle to enter the foundation pit, an annular supporting area and the trestle horizontal earth taking platform are excavated and constructed at the same time, after the trestle horizontal earth taking platform is completed, the rest earthwork on the layer enters the trestle through the horizontal earth taking platform all around to be transported out of the earth, and after the excavation is completed, the annular inner supporting structure (1) on the current layer is constructed in the excavated area to be supported;
s5, excavating earthwork of a base plate of the foundation pit: the method comprises the steps of firstly arranging pond slag roads at four corners of a foundation pit from a trestle horizontal platform, enabling an earthwork vehicle to be close to an excavating area of an excavator to take earth, then excavating the earthwork of a bottom plate in a partitioning mode, retreating and excavating towards the trestle platform, constructing earthwork below the trestle platform at last, parking a loading excavator around the horizontal earth taking platform, and transferring the earthwork below the platform into the earthwork vehicle to take out the earth outside the foundation pit through the trestle.
2. The method of earth excavation with annular bracing for foundation pits of claim 1, wherein: the transversal isosceles trapezoid shape setting of personally submitting of guided way (241), and the integrative fixed connection of last base and drive block (24) of guided way (241), and the both ends of guided way (241) all are provided with stopper (27), stopper (27) and the integrative fixed connection of drive block (24).
3. The method of earth excavation with annular bracing for foundation pits of claim 1, wherein: the abdicating groove (221) is arranged in a counter bore shape, and one end of the bending rod (26) far away from the connecting block (25) is arranged in a boss shape matched with the abdicating groove (221).
4. The earth excavation method for the annular bracing of the foundation pit according to any one of claims 1 to 3, wherein: the threaded rod (23) is provided with a plurality of driving blocks (24), and the driving blocks (24) are connected with the bending rods (26).
5. The earth excavation method for the annular bracing of the foundation pit according to any one of claims 1 to 3, wherein: the included angle direction of the bending rod (26) and the direction of the hollow pile anchor (22) inserted in the foundation pit are arranged in the opposite direction.
6. The earth excavation method for the annular bracing of the foundation pit according to any one of claims 1 to 3, wherein: the bending rods (26) are arranged in a plurality, and the bending rods (26) are circumferentially arranged on the circumferential surface of the driving block (24).
7. The method of earth excavation with annular bracing for foundation pits of claim 1, wherein: one end of the hollow pile anchor (22) connected to the foundation pit direction is pointed.
8. The method of earth excavation with annular bracing for foundation pits of claim 1, wherein: the arc plate (21) has been seted up towards the terminal surface of foundation ditch bottom and has been held chamber (212) hold chamber (212) and slide and be provided with extension board (28) in holding chamber (212) the arc plate (21) have been seted up stroke groove (213) on deviating from the terminal surface of foundation ditch lateral wall, stroke groove (213) communicate with each other with holding chamber (212) and arrange, fixedly connected with operation piece (281) on extension board (28), operation piece (281) sliding arrangement is on stroke groove (213) and outstanding outside the notch of stroke groove (213) arranges.
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| CN109680691B true CN109680691B (en) | 2021-04-06 |
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| CN110158604B (en) * | 2019-06-19 | 2021-07-02 | 北京城建北方集团有限公司 | Construction method of supporting structure at underpass of foundation pit |
| CN110593275B (en) * | 2019-09-04 | 2021-03-19 | 浙江化工工程地质勘察院有限公司 | Foundation pit support system |
| CN111784123A (en) * | 2020-06-12 | 2020-10-16 | 江苏省广电有线信息网络股份有限公司南京分公司 | Building block model-based broadcast and television pipeline engineering cost fine generation method |
| CN113668548B (en) * | 2021-07-28 | 2023-01-03 | 中国建筑一局(集团)有限公司 | Narrow foundation pit ramp supporting structure and construction method |
| CN114032910B (en) * | 2021-07-28 | 2023-10-03 | 中建一局集团华南建设有限公司 | Narrow foundation pit ramp structure and soil discharging method using same |
| CN114197553B (en) * | 2021-12-27 | 2023-04-04 | 上海市机械施工集团有限公司 | Foundation pit excavation device and method |
| CN114319444B (en) * | 2022-01-10 | 2023-12-01 | 中铁工程装备集团有限公司 | Shaft construction method and device |
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