CN218175854U - M-shaped wall foundation pit supporting structure using transverse single-width underground continuous wall as counterfort - Google Patents

Abstract

The utility model discloses an m-shaped wall foundation pit supporting structure using a transverse single-width underground continuous wall as a counterfort, which comprises a longitudinal underground continuous wall, a transverse single-width underground continuous wall, a vertical prestressed anchor cable, a vertical prestressed anchor head, a rib beam and a crown beam; the transverse single-width underground continuous wall, the rib beam, the vertical prestressed anchor cable and the vertical prestressed anchor head are matched with each other to replace an anchor cable in an anchor-pull type retaining structure, so that the anchor cable is prevented from colliding with a building and an underground pipeline, and the phenomenon that an infrared anchor cable outside the building occupies an underground space by crossing the boundary is avoided; the transverse single-width underground continuous wall, the rib beam, the vertical prestressed anchor cable and the vertical prestressed anchor head are matched with each other to replace an inner support in a supporting type retaining structure, so that the support is prevented from occupying the structural construction space, and the construction cost and the corresponding construction period of a main structure are saved; the longitudinal underground continuous wall and the transverse single-width underground continuous wall are rigidly connected layer by layer along with downward excavation through the rib beams to form a space retaining structure.

Description

M-shaped wall foundation pit supporting structure using transverse single-width underground continuous wall as counterfort

Technical Field

The utility model relates to an m type wall pit supporting construction with horizontal single width of cloth underground continuous wall as counterfort is applicable to the slope pit that faces among the geotechnical engineering and struts, and fungible stock just can effectively improve the stability of foundation ditch lateral wall, guarantees the safety and the normal use of foundation ditch peripheral building (structure) building, underground pipeline, road, belongs to underground works construction and technical field.

Background

In recent years, with the deepening of foundation pits of urban subway stations and high-rise buildings, in order to protect the safety of the construction of underground main body structures and the surrounding environment of the foundation pits, proper measures are required to be adopted for supporting the foundation pits. The prior art related to the technology comprises 3 anchor-pull type retaining structures, support type retaining structures, a deep foundation pit supporting structure (application number: CN 202021205357.0) and an external T-shaped beam supporting structure (application number: CN 202020202182.1) which are commonly used in engineering. The details are as follows:

prior art 1: the anchor pull type supporting structure is a supporting structure which mainly comprises a soil retaining component and an anchor rod, can be suitable for foundation pits with various depths, and is widely applied to engineering. The common retaining member in engineering includes 2 kinds of row piles and underground continuous wall, the row piles are support and block type structural parts or cantilever type support and block structures comprising support piles and crown beams arranged along the side wall of the foundation pit, and the underground continuous wall is a continuous underground wall formed by grooving and pouring reinforced concrete with special machinery in the groove sections. The anchor rod is a pull rod member composed of a rod body (steel strand, prestressed twisted steel, common steel bar or steel pipe), a grouting consolidation body, an anchorage device and a sleeve, one end of the anchor rod is connected with a supporting structure member, the other end of the anchor rod is anchored in the stable rock-soil body, and when the rod body is made of steel strand, the anchor rod is also called as an anchor cable.

Prior art 2: the supporting retaining structure is a retaining structure mainly comprising a retaining member and a support. The soil blocking component is arranged on the side wall of the foundation pit and embedded into the supporting and blocking type structural vertical component on the bottom surface of the foundation pit. Such as support piles, underground continuous walls. The inner support is arranged in a foundation pit and is a structural component which is composed of reinforced concrete or steel components and is used for supporting the soil retaining component. Only from the technical perspective, support formula retaining structure is wider than anchor and draws formula retaining structure application scope, but the setting of interior support causes very big obstacle for later stage major structure construction, so, when can with other supporting structure forms, people generally do not prefer first-selected interior supporting structure. The anchor pulling type retaining structure can provide great convenience for later-stage main structure construction, but is not suitable for using anchor rods under certain conditions. In addition, the anchor rod is left underground for a long time, which causes obstacles for the use of adjacent regions and the development of underground space, and does not meet the requirements of environmental protection and sustainable development.

Prior art 3: a deep foundation pit supporting structure (application number: CN 202021205357.0) relates to a deep foundation pit supporting structure. This deep basal pit supporting construction includes envelope and additional strengthening, wherein: the enclosure structure comprises a plurality of enclosure piles distributed circumferentially around the deep foundation pit and an enclosure crown beam formed at the tops of the enclosure piles, and the enclosure crown beam fixedly connects the enclosure piles into a whole; the reinforcing structure comprises a plurality of groups of fulcrum piles arranged at intervals along the circumferential direction of the deep foundation pit and reinforcing crown beams which correspond to each group of fulcrum piles one by one; the reinforced crown beam is formed at the top of each group of fulcrum piles, each group of fulcrum piles and the enclosure crown beam are fixedly connected into a whole, and the reinforced crown beam is perpendicular to the enclosure crown beam. The deep foundation pit supporting structure has the characteristics of high structural rigidity, capability of effectively controlling the deformation of the deep foundation pit, simplicity and convenience in construction and low cost.

Prior art 4: a T-shaped beam supporting structure outside a foundation pit (application number: CN 202020202182.1) discloses a T-shaped beam supporting structure outside the foundation pit, which comprises a crown beam and a plurality of tension beams, wherein the tension beams and the crown beam are on the same horizontal plane, one end of each tension beam is connected with the crown beam, the other end of each tension beam extends to the far pit side, so that the tension beams are perpendicular to the crown beam to form a T shape, and a plurality of tie piles are arranged below each tension beam.

The utility model has wide application range, strong anti-deformation capability, small occupied area and no influence on the use of the site outside the pit; and guarantee that supporting construction does not go out the red line, have the construction of being convenient for, the time limit for a project is short, advantage that the cost is low.

Disclosure of Invention

The technical purpose of the utility model is to provide an m type wall pit supporting construction with horizontal single width of cloth underground continuous wall replaces anchor rope (pole) as supporting, has solved following technical problem that meets in the current excavation supporting construction design work progress:

(1) The transverse single-width underground diaphragm wall, the rib beam (plate) and the vertical prestressed anchor cable are mutually matched, anchor cables (rods) in an anchor-pull type retaining structure commonly used in engineering are replaced, the problems that the anchor cables (rods) extend outwards and collide with buildings (structures) and underground pipelines or are out of bounds underground are solved, the buildings (structures) at the periphery of a foundation pit and the underground pipelines can be effectively guaranteed to be safe and normally used, anchor rods can be prevented from being used outside a building red line, an inner support does not need to be arranged, a good operation environment is provided for structural construction, and the construction cost and the corresponding construction period of the main structure are prevented by the inner support in erection and disassembly and space-time.

(2) A deep foundation pit supporting structure (application number: CN 202021205357.0) and a foundation pit outer T-shaped beam supporting structure (application number: CN 202020202182.1) set up horizontal row pile outside the foundation pit, only set up the crown beam and be connected with foundation pit retaining structure at the top, do not be in middle part and lower part and enclosure rigid connection, with the utility model discloses a compare with a m type wall foundation pit supporting structure with horizontal single width underground continuous wall as counterfort, its foundation pit supporting structure bulk rigidity is weaker, and the foundation pit lateral wall warp greatly, and the foundation pit supporting depth range that is applicable to is shallower.

The utility model discloses a technical scheme be an m type wall pit supporting construction as counterfort with horizontal single width underground continuous wall, including vertical underground continuous wall 1 (or vertical secant pile/campshed), horizontal single width underground continuous wall 2, vertical prestressed anchorage cable 3, vertical prestressed anchorage head 4, rib roof beam (board) 5 and guan liang 6.

The longitudinal underground continuous wall 1 (or the longitudinal secant pile/row pile) is arranged along the side wall of the foundation pit, the transverse single-width underground continuous wall 2 is vertical to the side wall of the foundation pit and is arranged at intervals along the trend of the side wall of the foundation pit, and the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2 form an m-shaped wall foundation pit supporting structure; the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2 are rigidly connected by a crown beam 6 and a rib beam (plate) 5; and a vertical prestressed anchor cable 3 is arranged on the inner side of the transverse single-width underground continuous wall 2 at the joint position of the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2. The top surface of a crown beam 6 of the transverse single-width underground continuous wall 2 at the joint position of the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2 is provided with a vertical prestressed anchor head 4, and the vertical prestressed anchor head 4 consists of an anchorage device welded on a steel backing plate; rib beams (plates) 5 are horizontally arranged between alternate wall surfaces of the transverse single-width underground continuous walls 2 and a space enclosed by the side surfaces of the longitudinal underground continuous walls 1, and adjacent rib beams (plates) 5 are rigidly connected with the transverse single-width underground continuous walls 2 and the longitudinal underground continuous walls 1 by adopting embedded bars; the crown beam 6 is formed by pouring reinforced concrete, is positioned at the tops of the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2, and is rigidly connected with the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2.

Further, the longitudinal underground continuous wall 1, the transverse single-width underground continuous wall 2, and the rib beams (plates) 5 are structures formed by pouring reinforced concrete.

Furthermore, the bottom anchoring section of the vertical prestressed anchor cable 3 is anchored in a stable stratum at the bottom of the wall by wrapping cement slurry outside steel strands, the upper free section of the steel strands penetrates through the wall through a vertical reserved hole, and a structure is formed by preloading and locking the steel strands at the anchor head 4.

Further, the longitudinal underground continuous wall 1 can be replaced by occlusive piles or row piles.

Further, the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2 are rigidly connected layer by layer through rib beams (plates) 5 to form a space structure.

Compared with the prior art, the utility model discloses following technical advantage has:

(1) The transverse single-width underground continuous wall, the rib beam (plate), the vertical prestressed anchor cable and the vertical prestressed anchor head are matched with each other, so that an anchor cable in an anchor-pull type retaining structure commonly used in engineering is replaced, the anchor cable is prevented from colliding with a building and an underground pipeline, and a non-environment-friendly event that the anchor cable occupies an underground space outside a building infrared line is eliminated;

(2) The transverse single-width underground continuous wall, the rib beam (plate), the vertical prestressed anchor cable and the vertical prestressed anchor head are mutually matched, so that an inner support in a common supporting type retaining structure in engineering is replaced, the construction time and space of the structure occupied by the support are avoided, and the cost and the corresponding construction period for erecting and dismantling the support and obstructing the construction of a main structure in time and space are saved;

(3) The vertical prestressed anchor cables and the vertical prestressed anchor heads are arranged at the joint position of the longitudinal underground continuous wall (or the longitudinal secant piles/row piles) and the transverse single-width underground continuous wall, so that the anti-overturning capacity of the transverse single-width underground continuous wall is improved, and the deformation of the side wall of the foundation pit is reduced;

(4) The longitudinal underground continuous wall (or the longitudinal secant pile/row pile) and the transverse single-width underground continuous wall are rigidly connected layer by layer along with downward excavation through the rib beams (plates) to form a space retaining structure, the integral rigidity of the space retaining structure is obviously improved, and the stability of foundation pit support is enhanced.

The utility model discloses a horizontal single width of cloth underground continuous wall, rib roof beam (board) and vertical prestressed anchorage cable mutually support, replaced anchor rope (pole) in "anchor draw formula retaining structure" commonly used in the engineering, overcome anchor rope (pole) the border-crossing defect of current "anchor draw formula retaining structure", provided one kind and regarded as the m type wall foundation pit supporting structure of counterfort with horizontal single width of cloth underground continuous wall.

Drawings

Fig. 1 is an integral structure I of an m-shaped wall foundation pit supporting structure of an underground continuous wall.

Fig. 2 is an integral II of the m-shaped wall foundation pit supporting structure of the underground continuous wall.

Fig. 3 is a schematic diagram I of a supporting structure of an m-shaped wall foundation pit of the underground continuous wall.

Fig. 4 is a schematic view II of an m-shaped wall foundation pit supporting structure of the underground continuous wall.

Fig. 5 is a side view of an m-type wall pit supporting structure of the underground diaphragm wall.

Fig. 6 is an elevation view of an m-type wall pit supporting structure of the underground continuous wall.

Fig. 7 is a schematic view of a m-shaped wall foundation pit supporting structure of the secant pile replacing the longitudinal underground continuous wall.

In fig. 1 to 7, 1 is a longitudinal underground diaphragm wall; 2. a transverse single underground continuous wall; 3. a vertical pre-stressed anchor cable; 4. a vertically prestressed anchor head; 5. a rib (plate); 6. a crown beam.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

The utility model provides an m type wall foundation pit supporting construction as counterfort with horizontal single width underground continuous wall includes vertical underground continuous wall 1 (or vertical secant pile/campshed), horizontal single width underground continuous wall 2, vertical prestressed anchorage cable 3, vertical prestressed anchorage head 4, rib roof beam (board) 5 and guan liang 6, totally 6 parts, as shown in fig. 1 ~ 6. When geotechnical conditions permit, the longitudinal underground continuous wall can also be replaced by occlusive piles or row piles, as shown in fig. 7.

The longitudinal underground continuous wall 1 (or the longitudinal secant pile/row pile) is formed by pouring reinforced concrete and is arranged along the side wall of the foundation pit; the transverse single-width underground continuous walls 2 are formed by pouring reinforced concrete, are perpendicular to the side wall of the foundation pit, are arranged at intervals along the trend of the side wall of the foundation pit, and are determined according to calculation, wherein the interval between every two adjacent transverse single-width underground continuous walls 2 is 3.0-6.0 m; the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2 are rigidly connected by a crown beam 6 and a rib beam (plate) 5, the vertical prestressed anchor cable 3 is formed by wrapping cement (sand) slurry outside a steel strand, is positioned at the inner side of the transverse single-width underground continuous wall 2 at the joint position of the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2, the vertical prestressed anchor cable 3 is drilled into a hole below the wall (pile) body, the crown beam reserved hole and the wall (pile) end through the position of the vertical prestressed anchor cable, and then the lower part is grouted to apply prestress on a top anchor head 4 and is locked. The vertical prestressed anchor head 4 consists of a steel base plate and an anchorage, is positioned on the top surface of a crown beam 6 of the transverse single-width underground continuous wall 2 at the joint position of the longitudinal underground continuous wall 1 and the transverse single-width underground continuous wall 2, and is a component which is connected with the top of a vertical prestressed anchor cable 3 and the transverse single-width underground continuous wall 2 through the crown beam 6 and can apply prestress; the ribbed beams (plates) 5 are formed by pouring reinforced concrete, are horizontally arranged between alternate wall surfaces of the transverse single-width underground continuous wall 2 and a space enclosed by the side surface of the longitudinal underground continuous wall 1, are constructed downwards layer by layer along with excavation below soil and stones of a foundation pit, adjacent ribbed beams (plates) are rigidly connected with the transverse single-width underground continuous wall 2 and the longitudinal underground continuous wall 1 by embedded steel bars, the vertical distance between the adjacent ribbed beams (plates) 5 is 2.0-6.0 m, and the specific distance is determined according to calculation; the crown beam 6 is formed by pouring reinforced concrete and is positioned at the top of the longitudinal underground continuous wall 1 (or the longitudinal secant pile/row pile) and the transverse single-width underground continuous wall 2.

Fig. 1 to 2 show an integral model of a m-shaped wall and pit supporting structure of a longitudinal lower continuous wall, fig. 3 to 4 show a schematic diagram of the m-shaped wall and pit supporting structure of the longitudinal lower continuous wall, fig. 5 shows a side view of the m-shaped wall and pit supporting structure of the longitudinal lower continuous wall, fig. 6 shows an elevation view of the m-shaped wall and pit supporting structure of the longitudinal lower continuous wall, and fig. 7 shows a schematic diagram of the m-shaped wall and pit supporting structure of the longitudinal lower continuous wall instead of the longitudinal lower continuous wall.

The utility model discloses a technical scheme be an m type wall foundation pit supporting construction concrete implementation engineering as the counterfort with horizontal single width underground continuous wall as follows:

(1) Constructing a longitudinal underground continuous wall 1 and a transverse single-width underground continuous wall 2 one by one according to the sequence of guide wall construction, slurry preparation, groove digging and cleaning, reinforcement cage manufacturing and hoisting, underground continuous wall joint construction and concrete pouring; when the foundation pit geotechnical engineering conditions are allowed, longitudinal secant piles or row piles can be adopted to replace the longitudinal underground continuous wall 1, plain concrete piles and reinforced concrete piles can be driven at intervals according to the sequence of slurry preparation, hole forming, reinforcement cage manufacturing and hoisting, and concrete pouring, and the longitudinal secant piles are driven (the plain concrete piles among the piles are not required to be driven when the row piles are adopted only).

(2) And (3) after the construction of the longitudinal underground continuous wall 1 (or the longitudinal secant pile/row pile) is finished, constructing the crown beam 6.

(3) Constructing a vertical prestressed anchor cable 3, and applying prestress through a vertical prestressed anchor head 4 to improve the anti-overturning capability of the transverse single-width underground continuous wall 2;

(4) Along with the downward excavation of the earth and stone direction, the rib beam (plate) 5 is constructed layer by layer until the bottom of the foundation pit.

Claims (3)

1. M type wall foundation pit supporting construction with horizontal single width underground continuous wall as counterfort, its characterized in that: the vertical single-width underground continuous wall comprises a longitudinal underground continuous wall, a transverse single-width underground continuous wall, a vertical pre-stressed anchor cable, a vertical pre-stressed anchor head, a rib beam and a crown beam; the longitudinal underground continuous wall and the transverse single-width underground continuous wall are rigidly connected layer by layer from top to bottom through the rib beams to form a space structure;

the longitudinal underground continuous walls are arranged along the side wall of the foundation pit, and the transverse single-width underground continuous walls are arranged in the direction vertical to the side wall of the foundation pit and at intervals along the trend of the side wall of the foundation pit; the longitudinal underground continuous wall and the transverse single-width underground continuous wall are rigidly connected by a wall top crown beam and a rib beam; a vertical prestressed anchor cable is arranged on the inner side of the transverse single-width underground continuous wall at the joint position of the longitudinal underground continuous wall and the transverse single-width underground continuous wall; the top surface of a crown beam of the transverse single-width underground continuous wall at the joint position of the longitudinal underground continuous wall and the transverse single-width underground continuous wall is provided with a vertical prestressed anchor head, the vertical prestressed anchor head consists of a steel backing plate and an anchorage device, and the vertical prestressed anchor head is a member which is arranged on the top surface of the crown beam of the transverse single-width underground continuous wall at the top of a vertical prestressed anchor cable and can apply prestress; the rib beams are formed by pouring reinforced concrete, are horizontally arranged between alternate wall surfaces of the transverse single-width underground continuous wall and a space surrounded by the side surface of the longitudinal underground continuous wall, are constructed downwards layer by layer along with the downward excavation of the earth and stones of the foundation pit, and are rigidly connected with the transverse single-width underground continuous wall and the longitudinal underground continuous wall by embedded bars; the top beam is formed by pouring reinforced concrete and is positioned on the top of the longitudinal underground continuous wall and the top of the transverse single-width underground continuous wall;

the longitudinal underground continuous wall, the transverse single-width underground continuous wall and the rib beam are of structures formed by pouring reinforced concrete;

the vertical prestressed anchor cable is a structure formed by wrapping cement paste outside a steel strand.

2. An m-type wall pit supporting structure using a transverse single underground continuous wall as a buttress according to claim 1, wherein: the longitudinal underground continuous wall is replaced by either occlusive piles or row piles.

3. The m-type wall foundation pit supporting structure using the transverse single-width underground continuous wall as the counterfort as claimed in claim 1, wherein: the longitudinal underground continuous wall and the transverse single-width underground continuous wall are rigidly connected layer by layer through the rib beams to form a space structure.

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