CN110777848A - Movable support based on underground space development above subway and construction method thereof - Google Patents
Movable support based on underground space development above subway and construction method thereof Download PDFInfo
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- CN110777848A CN110777848A CN201911101066.9A CN201911101066A CN110777848A CN 110777848 A CN110777848 A CN 110777848A CN 201911101066 A CN201911101066 A CN 201911101066A CN 110777848 A CN110777848 A CN 110777848A
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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
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention relates to a movable support system arranged at the beam end of a support beam on a subway protection pile, a prestressed beam type underpinning structure and a foundation pit supporting structure based on underground space development above a subway and a construction method thereof, wherein the movable support system comprises a plurality of underpinning piles which are sequentially abutted and arranged and an underpinning beam which is in sliding connection with the underpinning piles, one side of each underpinning pile is provided with a pile body protection wall filled with concrete, a horizontally arranged U-shaped waist beam is embedded in the pile body protection wall, the end part of each underpinning beam is arranged in an opening of the U-shaped waist beam, and a gap is reserved between the end part of each underpinning beam and a web plate; the construction method comprises the following steps: s1, underpinning pile construction; s2, constructing a movable support; s3, constructing a bottom plate conversion structure; s4, underpinning the beam; s5, pre-stress tensioning of the bottom plate; and S6, directly pouring the underpinning beam in the basement bottom plate. The invention has the effect that the underpinning pile cannot be forcibly driven to generate displacement after the underpinning beam generates displacement due to the tensioning of the prestress.
Description
Technical Field
The invention relates to the technical field of development of an upper space of a subway, in particular to a movable support based on development of an underground space above the subway and a construction method thereof.
Background
At present, when building construction such as foundation pit excavation is carried out on the top of a subway tunnel, a underpinning beam is generally required to be arranged on the top of the subway tunnel, an underpinning pile for bearing the underpinning beam is arranged outside the side line of the subway tunnel, and load of a building on the top of the subway tunnel is transmitted to the underpinning pile through the underpinning beam, so that the existing load on the top of the subway tunnel is transmitted to the lower part of the subway tunnel, and the protection effect is achieved on the subway tunnel.
Underpinning piles on two sides of the subway tunnel are generally at least spaced by more than 30m, the section height of the underpinning beam is large, a constructor needs to perform foundation pit excavation above the subway tunnel, and in the excavation process, the constructor needs to support a supporting structure at the periphery of the foundation pit, so that the support at the periphery of the foundation pit is prevented from displacing after the foundation pit excavation.
In the pile foundation underpinning engineering, in order to ensure that the underpinning beam has enough strength and rigidity, a design unit usually enhances the anti-cracking capacity by carrying out bidirectional prestress tensioning on the underpinning beam, but simultaneously, the underpinning beam can generate larger horizontal displacement after being tensioned due to prestress, so that the underpinning beam forcibly drives the underpinning pile fixed with the underpinning beam to cause the underpinning pile to be pulled to generate displacement or cause the joint of the underpinning pile and the underpinning beam to be broken, and the construction hidden danger is larger.
Therefore, it is necessary to develop a movable support system and a construction method thereof, which are arranged at the beam end of a support beam on a subway protection pile, a prestressed beam underpinning structure and a foundation pit supporting structure based on the development of the underground space above the subway.
Disclosure of Invention
One of the purposes of the invention is to provide a movable support based on underground space development above a subway, which has the function of preventing a underpinning pile from being forcibly driven to generate displacement after the underpinning beam generates displacement due to prestress tensioning.
One of the above objects of the present invention is achieved by the following technical solutions:
the utility model provides a movable support based on underground space development above subway, include a plurality of underpinning piles of butt range in proper order and with underpinning pile sliding connection's underpinning roof beam, underpinning pile one side is equipped with the pile body dado that concrete was filled, the U type waist rail that the level was placed is embedded to be fit for in the pile body dado, U type waist rail includes a web and connects in the flange board of web both sides and perpendicular to web, the opening direction of U type waist rail is the underpinning stake dorsad, the tip of underpinning the roof beam is placed in the opening of U type waist rail, leave the clearance between the tip of underpinning the roof beam and the web.
By adopting the technical scheme, the flange plate of the U-shaped waist beam is in sliding contact with the underpinning beam, after the underpinning beam is deformed by prestress tension, the end part of the underpinning beam slides in the U-shaped waist beam, so that a force towards the underpinning beam is not easy to generate on the underpinning pile, and after the underpinning pile is extruded by the pressure generated by the foundation in the direction back to the underpinning beam, the underpinning pile leans against the underpinning beam, and the U-shaped waist beam slides relative to the underpinning beam; the load of the building above the subway tunnel is transmitted to the underpinning pile through the underpinning beam, so that the existing load above the subway tunnel is transmitted to the lower part of the subway tunnel, the subway tunnel is protected, and the potential safety hazard of foundation underpinning engineering construction is small.
Preferably, the underpinning beam comprises four horizontal rods which are arranged in parallel and have L-shaped sections, and the two adjacent horizontal rods are same in interval and are symmetrically designed; a plurality of end-to-end diagonal braces are connected to two adjacent horizontal rods, and a plurality of vertical rods perpendicular to the length direction of the horizontal rods are connected between the two adjacent horizontal rods.
Through adopting above-mentioned technical scheme, the diagonal brace is fixed in on the lateral wall of horizon bar, and underpinning roof beam load distribution is comparatively balanced, is difficult for producing great deformation, and underpinning roof beam structural strength is better, and the underpinning roof beam is better to the effect of strutting of underpinning the stake, is difficult for taking place the incident.
Preferably, the joint of the horizontal rod and the vertical rod corresponds to the joint of the head and the tail of two adjacent inclined supporting rods, and a reinforcing rod is obliquely arranged between the two vertical rods which are perpendicular to each other and adjacent to each other.
By adopting the technical scheme, the arrangement of the reinforcing rods ensures that the structural strength inside the underpinning beam is better, the underpinning beam is not easy to deform due to stress, the deformation bearing capacity of the underpinning beam is better, the underpinning beam is not easy to damage when prestress is applied to the underpinning beam, the supporting effect of the underpinning beam on the underpinning pile is better, and the construction hidden danger is smaller.
Preferably, the inclined supports and the vertical rods are welded with the horizontal rods, and the reinforcing rods are welded with the vertical rods.
By adopting the technical scheme, the underpinning pile supporting structure has the advantages that workers can conveniently process the underpinning pile, the connecting structure among the components is compact, the underpinning pile is not prone to large deformation, the underpinning pile can bear large deformation well, the supporting effect of the underpinning pile on the underpinning pile is good, and construction hidden dangers are small.
Preferably, a stiffening rib plate is welded at one end of the horizontal rod, which is placed on the U-shaped waist beam.
By adopting the technical scheme, the contact area between the underpinning beam and the U-shaped waist beam is larger, the firmness between the underpinning beam and the U-shaped waist beam is improved, the contact end between the underpinning beam and the U-shaped waist beam is not easy to damage, and the engineering construction quality is improved.
Preferably, reinforcing ribs are planted in the underpinning piles, and the reinforcing ribs are welded with one side of the web plate, which is back to the underpinning beam.
Through adopting above-mentioned technical scheme, because the underpinning roof beam is great to the load that U type waist rail applyed, bar planting and mutual welded effect, U type waist rail bearing capacity is great, is difficult for the pressurized emergence to destroy, reduces the emergence of potential safety hazard, and the work progress is comparatively safe.
In conclusion, the beneficial technical effects of the invention are as follows:
after the underpinning beam is subjected to prestress tensioning, a worker can not easily generate an acting force towards the underpinning beam on the underpinning pile by the underpinning beam, and after the underpinning pile is extruded by pressure generated by a foundation in the direction back to the underpinning beam, the underpinning pile leans against the underpinning beam, and the U-shaped waist beam slides relative to the underpinning beam; the load of the building above the subway tunnel is transmitted to the underpinning pile through the underpinning beam, so that the existing load above the subway tunnel is transmitted to the lower part of the subway tunnel, the subway tunnel is protected, and the potential safety hazard of foundation underpinning engineering construction is small.
One of the purposes of the invention is to provide a construction method of a movable support based on underground space development above a subway, which is convenient to construct and high in safety.
One of the above objects of the present invention is achieved by the following technical solutions:
a construction method of a movable support based on underground space development above a subway comprises the following steps:
s1, underpinning pile construction, namely, according to a design drawing, paying off and positioning an underpinning range, dismantling a ground structure of a building structure above the subway tunnel, performing pile foundation construction, and constructing underpinning piles which are sequentially abutted and arranged on the periphery of a sideline of the subway tunnel, wherein the underpinning piles adopt manual hole digging piles;
s2, constructing a movable support, filling one side of the underpinned pile close to the center of the foundation pit with cement mortar to form a pile body retaining wall, arranging two U-shaped waist beams along the horizontal direction;
s3, constructing a bottom plate conversion structure, pouring a lower pile top bearing platform, pouring concrete around and below the original bearing platform to form a new bearing platform, and pouring concrete upwards to form a bottom plate;
s4, underpinning the beam, transversely constructing the underpinned beam above the set elevation higher than the bottom surface of the foundation pit, wherein one end of the underpinned beam is connected with the bottom plate, and the other end of the underpinned beam corresponds to the U-shaped waist beam; the underpinning beam plays a role in supporting the underpinning pile;
s5, performing bidirectional prestress tensioning, wherein the operator performs bidirectional prestress tensioning on the bottom plate to enable the underpinning beam and the underpinning pile to generate relative displacement;
s6, directly pouring the underpinned beam in the basement bottom plate;
by adopting the technical scheme, the underpinning beam is connected with the U-shaped waist beam in a sliding manner, the loading capacity of the U-shaped waist beam is high, the underpinning beam slides in the U-shaped waist beam after being stretched and displaced due to prestress, the underpinning beam is not easy to generate an acting force towards the underpinning beam on the underpinning pile, and the underpinning pile leans against the underpinning beam and the U-shaped waist beam slides relative to the underpinning beam after being extruded by pressure generated by a foundation in the direction of the underpinning pile back to the underpinning beam; the load of the building above the subway tunnel is transmitted to the underpinning pile through the underpinning beam, so that the existing load above the subway tunnel is transmitted to the lower part of the subway tunnel, the subway tunnel is protected, and the potential safety hazard of foundation underpinning engineering construction is small.
Preferably, before the underpinning beam is tensioned, one end of the underpinning beam is placed in the U-shaped waist rail corresponding to the underpinning beam, and the end part of the underpinning beam is abutted against the flange plate.
By adopting the technical scheme, when the underpinned beam is subjected to prestress tensioning, the underpinned beam deforms and moves relative to the U-shaped waist beam, the underpinned beam is not fixedly connected with the U-shaped waist beam, the underpinned beam is not easy to generate a force towards the underpinned beam on the underpinned pile, the flange plate of the U-shaped waist beam bears the load of the underpinned beam, and the underpinned beam slides on the flange plate back to the web plate.
Preferably, in the movable support construction process, when the concrete strength of the pile body dado reaches the preset 80%, the underpinning pile is subjected to a bar planting process, then two parallel U-shaped waist beams are arranged along the horizontal direction, and the U-shaped waist beams are welded with the steel bars on the underpinning pile.
Through adopting above-mentioned technical scheme, make U type waist rail construction and installation convenient, load distribution is even, and difficult stress concentration leads to the damage, and the work progress is simple, has improved effective protection dynamics and construction safety to existing protective building structure.
In conclusion, the beneficial technical effects of the invention are as follows:
the flange plate of the U-shaped waist rail is in sliding contact with the underpinning beam, after the underpinning beam is deformed by prestress tension, the end part of the underpinning beam slides in the U-shaped waist rail, so that a force towards the underpinning beam is not easy to generate on the underpinning pile, and after the underpinning pile is extruded by the pressure generated by the foundation in the direction opposite to the underpinning beam, the underpinning pile leans against the underpinning beam, and the U-shaped waist rail slides relative to the underpinning beam; the load of the building above the subway tunnel is transmitted to the underpinning pile through the underpinning beam, so that the existing load above the subway tunnel is transmitted to the lower part of the subway tunnel, the subway tunnel is protected, and the potential safety hazard of foundation underpinning engineering construction is small.
Drawings
Fig. 1 is a first schematic view of the connection of the underpinning beam and underpinning pile of the present invention.
Fig. 2 is a schematic cross-sectional view at a in fig. 1, showing the overall construction of the underpinning beam.
Fig. 3 is a second schematic view of the connection of the underpinning beams and underpinning piles of the present invention.
In the figure, 1, underpinning a pile; 2. pile body protecting wall; 3. a U-shaped waist rail; 4. a web; 5. a flange plate; 6. a horizontal bar; 7. a diagonal brace; 8. a vertical rod; 9. a reinforcing bar; 10. a stiffening rib plate; 11. the bottom plate changes the plate structure.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As can be seen from fig. 1 and 3, the movable support system for arranging at the beam end of a support beam on a subway protection pile, a prestressed beam type underpinning structure and a foundation pit supporting structure based on the development of the underground space above the subway and the construction method thereof disclosed by the invention comprises an underpinning pile 1 and an underpinning beam arranged in a sliding manner with the underpinning pile 1, wherein one end of the underpinning beam, which faces away from the underpinning pile 1, is connected with a bottom plate conversion plate structure 11, a pile body protection wall 2 is cast at one side of the underpinning pile 1, which is close to the underpinning beam, and two parallel U-shaped waist beams 3 are embedded in the pile body protection wall 2 along the horizontal direction; the underpinning pile 1 is a manual hole digging pile.
As shown in fig. 1, the U-shaped wale 3 includes a web 4 and flange plates 5 connected to both sides of the web 4 and perpendicular to the web 4, the opening direction of the U-shaped wale 3 faces away from the underpinning pile 1, and the end of the underpinning pile is placed in the opening of the U-shaped wale 3 and is slidably connected with the flange plates 5; the underpinning pile 1 is internally planted with a reinforcing rib with the diameter of phi 25, and the reinforcing rib is welded with one side of the web plate 4 back to the underpinning beam.
When the staff installed U type waist rail 3, need chisel in advance and remove 3 mounted position of U type waist rail corresponding pile body dado 2 to implant the strengthening rib, weld U type waist rail 3 on underpinning stake 1 after the strengthening rib is fixed.
As can be seen from fig. 1 to 3, the underpinning beam includes four horizontal rods 6 which are arranged in parallel and have L-shaped cross sections, and a stiffening rib plate 10 is welded at one end of the horizontal rod 6 which is placed on the U-shaped waist rail 3; the distance between two adjacent horizontal rods 6 is the same and the two horizontal rods are symmetrically designed; a plurality of end-to-end diagonal braces 7 are connected to two adjacent horizontal rods 6, and a plurality of vertical rods 8 perpendicular to the horizontal rods 6 in the length direction are connected between the two adjacent horizontal rods 6. The joint of the horizontal rod 6 and the vertical rod 8 corresponds to the joint of the head and the tail of two adjacent inclined supporting rods 7, and a reinforcing rod 9 is arranged between the two vertical rods 8 which are perpendicular to each other and inclined; the inclined support and the vertical rod 8 are welded with the horizontal rod 6, and the reinforcing rod 9 is welded with the vertical rod 8; the welding seams among the components are fillet welding seams and full welding seams, and the welding seams are at least 6mm later.
A construction method of a movable support based on underground space development above a subway comprises the following steps:
s1, carrying out underpinning range setting-out positioning according to a design drawing, dismantling a ground structure of an existing protective building structure above a subway tunnel where a construction section is located, carrying out pile foundation construction, constructing underpinning piles 1 which are sequentially abutted and arranged on the periphery of a sideline of the subway tunnel, and manually digging piles for the underpinning piles 1;
s2, constructing a movable support, filling one side of the underpinning pile 1 close to the center of the foundation pit with cement mortar to form a pile body retaining wall 2, arranging two U-shaped waist beams 3 on the pile body retaining wall 2 in the horizontal direction; when the concrete strength of the pile body protecting wall 2 reaches a preset value of 80%, removing the concrete on the pile body protecting wall 2 close to the position where the U-shaped waist rail 3 is placed, exposing the pile body protecting wall 2, performing a bar planting process on the underpinning pile 1, implanting a reinforcing bar with the diameter of 25 into the underpinning pile 1, firstly drilling a hole at a preset position where the underpinning pile 1 is in contact with the U-shaped waist rail 3 by a worker, spirally inserting the reinforcing bar into the drilled hole of the underpinning pile 1, and exposing partial reinforcing bar; the gap between the U-shaped waist rail 3 and the underpinning pile 1 is filled with M20 cement mortar, the reinforcing rib is welded with one side of the web plate 4 back to the underpinning beam, and two parallel U-shaped waist rails 3 are arranged along the horizontal direction.
S3, constructing a bottom plate conversion structure, pouring a lower pile top bearing platform, pouring concrete around and below the original bearing platform to form a new bearing platform, and pouring concrete upwards to form a bottom plate; and constructing a bottom plate conversion structure, and fixedly connecting the underpinning beam and the bottom plate conversion structure.
S4, underpinning the beam, transversely constructing the underpinned beam above the set elevation higher than the bottom surface of the foundation pit, wherein one end of the underpinned beam is connected with the bottom plate, and the other end of the underpinned beam corresponds to the U-shaped waist beam 3; before the underpinning beam is tensioned, one end of the underpinning beam is placed in the U-shaped waist beam 3 corresponding to the underpinning beam, and the underpinning beam plays a role in supporting the underpinning pile 1.
And S5, performing bidirectional prestress tensioning, wherein the bottom plate is subjected to bidirectional prestress tensioning by a worker to enable the underpinning beam to generate displacement, and the underpinning beam plays a role in supporting the underpinning pile 1.
And S6, directly pouring the underpinning beam in the basement bottom plate. The underpinning beam is connected with the U-shaped waist beam 3 in a sliding manner, the loading capacity of the U-shaped waist beam 3 is high, the underpinning beam slides in the U-shaped waist beam 3 after being stretched and displaced due to prestress, the underpinning beam is not easy to generate a force towards the underpinning beam on the underpinning pile 1, and after the underpinning pile 1 is extruded by the pressure generated by a foundation in the direction back to the underpinning beam, the underpinning pile 1 leans to the underpinning beam, and the U-shaped waist beam 3 slides relative to the underpinning beam; the load of the building above the subway tunnel is transmitted to the underpinning pile 1 through the underpinning beam, so that the existing load above the subway tunnel is transmitted to the lower part of the subway tunnel, the subway tunnel is protected, and the potential safety hazard of foundation underpinning engineering construction is small.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a movable support based on underground space development above subway which characterized in that: underpinning stake (1) and underpinning roof beam with underpinning stake (1) sliding connection including a plurality of butt arrangements in proper order, underpinning stake (1) one side is equipped with pile body dado (2) that the concrete was filled, U type waist rail (3) that the level was placed are embedded to be closed in pile body dado (2), U type waist rail (3) include a web (4) and connect in web (4) both sides and perpendicular to flange board (5) of web (4), the opening direction of U type waist rail (3) is underpinned stake (1) dorsad, the tip of underpinning roof beam is placed in the opening of U type waist rail (3), leave the clearance between the tip of underpinning roof beam and web (4).
2. The movable support saddle based on underground space development above the subway according to claim 1, characterized in that: the underpinning beam comprises four horizontal rods (6) which are arranged in parallel and have L-shaped sections, and the two adjacent horizontal rods (6) have the same interval and are symmetrically designed; a plurality of end-to-end diagonal braces (7) are connected to two adjacent horizontal rods (6), and a plurality of vertical rods (8) which are vertical to the horizontal rods (6) in the length direction are connected between the two adjacent horizontal rods (6).
3. The movable support saddle based on underground space development above the subway as claimed in claim 2, wherein: the joint of the horizontal rod (6) and the vertical rod (8) corresponds to the joint of the head and the tail of the two adjacent inclined supporting rods (7), and the two vertical rods (8) which are perpendicular to each other are obliquely provided with a reinforcing rod (9).
4. The movable support saddle based on underground space development above the subway according to claim 3, characterized in that: the inclined supports and the vertical rods (8) are welded with the horizontal rods (6), and the reinforcing rods (9) are welded with the vertical rods (8).
5. The movable support saddle based on underground space development above the subway as claimed in claim 2, wherein: and a stiffening rib plate (10) is welded at one end of the horizontal rod (6) which is arranged on the U-shaped waist beam (3).
6. The movable support saddle based on underground space development above the subway according to claim 1, characterized in that: reinforcing ribs are planted in the underpinning pile (1), and the reinforcing ribs are welded with one side, back to the underpinning beam, of the web plate (4).
7. A construction method of a movable support based on underground space development above a subway is characterized by comprising the following steps: the method comprises the following steps:
s1, constructing underpinning piles (1), setting out and positioning underpinning ranges according to design drawings, dismantling a ground structure of a building structure above a subway tunnel, constructing pile foundations, constructing at the periphery of a sideline of the subway tunnel, sequentially abutting the underpinning piles (1) in arrangement, and manually digging holes for the underpinning piles (1);
s2, constructing a movable support, filling one side of the underpinning pile (1) close to the center of the foundation pit with cement mortar to form a pile body retaining wall (2), arranging the pile body retaining wall (2), and arranging two U-shaped waist beams (3) along the horizontal direction;
s3, constructing a bottom plate conversion structure, pouring a lower pile top bearing platform, pouring concrete around and below the original bearing platform to form a new bearing platform, and pouring concrete upwards to form a bottom plate;
s4, underpinning the beam, transversely constructing the underpinned beam above the set elevation higher than the bottom surface of the foundation pit, wherein one end of the underpinned beam is connected with the bottom plate, and the other end of the underpinned beam corresponds to the U-shaped waist beam (3); the underpinning beam plays a role in supporting the underpinning pile (1);
s5, bidirectional prestress tensioning, wherein the bottom plate is tensioned in a bidirectional prestress manner by workers to enable the underpinning beam and the underpinning pile (1) to generate relative displacement;
and S6, directly pouring the underpinning beam in the basement bottom plate.
8. The production method of the movable support seat developed based on the underground space above the subway as claimed in claim 7, wherein: before the underpinning beam is tensioned, one end of the underpinning beam is placed in the U-shaped waist beam (3) corresponding to the underpinning beam, and the end part of the underpinning beam is abutted against the flange plate (5).
9. The production method of the movable support seat developed based on the underground space above the subway as claimed in claim 8, wherein: before the underpinning beam is tensioned, one end of the underpinning beam is placed in the U-shaped waist beam (3) corresponding to the underpinning beam, and a margin allowing the underpinning beam to slide is reserved between the end part of the underpinning beam and a web plate (4) of the U-shaped waist beam (3).
10. The production method of the movable support seat developed based on the underground space above the subway as claimed in claim 9, wherein: in the construction process of the movable support, when the concrete strength of the pile body protecting wall (2) reaches 80% of the preset strength, a bar planting process is carried out on the underpinning pile (1), then two parallel U-shaped waist beams (3) are arranged along the horizontal direction, and the U-shaped waist beams (3) are welded with steel bars on the underpinning pile (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911101066.9A CN110777848B (en) | 2019-11-12 | 2019-11-12 | Construction method of movable support based on underground space development above subway |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911101066.9A CN110777848B (en) | 2019-11-12 | 2019-11-12 | Construction method of movable support based on underground space development above subway |
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| CN110777848A true CN110777848A (en) | 2020-02-11 |
| CN110777848B CN110777848B (en) | 2020-08-25 |
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| CN110777848B (en) | 2020-08-25 |
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