CN214940189U - Large-span foundation pit inner supporting structure - Google Patents
Large-span foundation pit inner supporting structure Download PDFInfo
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- CN214940189U CN214940189U CN202120330882.3U CN202120330882U CN214940189U CN 214940189 U CN214940189 U CN 214940189U CN 202120330882 U CN202120330882 U CN 202120330882U CN 214940189 U CN214940189 U CN 214940189U
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Abstract
The utility model belongs to the technical field of the excavation supporting, a large-span foundation ditch inner supporting structure is disclosed, in order to solve the poor problem of bearing capacity of current anti-floating anchor pole on weak stratum. The utility model can save the construction amount of the support in the large foundation pit compared with the prior art on the premise of ensuring the stability of the support of the large-span foundation pit; meanwhile, according to the favorable characteristics of the periphery of the foundation pit, a single large span is adopted for supporting, so that the influence on later-stage main structure construction is avoided; the use amount of concrete and steel bars is reduced, the construction period is shortened, the construction cost is reduced, and the development direction of the green deep foundation pit is met.
Description
Technical Field
The utility model belongs to the technical field of the excavation supporting, concretely relates to large-span foundation ditch inner supporting structure.
Background
A foundation pit is a space excavated from the ground downward for constructing the underground portion of a building. Usually, the surrounding environment of the foundation pit is complex, and if the surrounding environment is close to municipal roads, subways, high-rise buildings and the like, protection is needed, so that the deformation and stability in the excavation process of the foundation pit are strictly controlled.
The inner support is a support measure which can effectively control the deformation of the foundation pit in the foundation pit support, and is widely used in deep and large foundation pits which need deformation control. The conventional inner support has the main advantages that: the advantages of the material are utilized. And secondly, the excavation and transportation speed of the earthwork is accelerated. And thirdly, the construction cost is reduced. And fourthly, the method is not limited by the shortage of peripheral fields.
However, the inner support of the existing large-span foundation pit has the following technical problems:
firstly, the weight is great; secondly, materials are not easy to recycle; the cost is more expensive than the pile anchor support; and fourthly, influencing the later-stage main structure construction.
SUMMERY OF THE UTILITY MODEL
The utility model provides an inner support structure of a large-span foundation pit, which can save the construction amount of the inner support of the large foundation pit, in order to solve the problem that the inner support of the large-span foundation pit has high cost; according to the favorable characteristics of the periphery of the foundation pit, a single large span is adopted for supporting, so that the influence on later-stage main structure construction is avoided; the usage amount of concrete and steel bars is reduced.
For solving the technical problem, the utility model discloses the technical scheme who adopts is:
a large-span foundation pit inner support structure is characterized by comprising a plurality of supporting piles arranged along the periphery of a foundation pit, wherein the tops of the supporting piles are connected together through crown beams, a plurality of waist beams are sequentially arranged on each supporting pile from top to bottom at intervals, the waist beams connect the supporting piles together, and each waist beam is connected with a horizontal supporting beam formed by pouring reinforced concrete; the fender pile includes upper segment fender pile and hypomere fender pile, hypomere fender pile is for pouring the bored concrete pile that forms by the steel reinforcement cage and hypomere fender pile is located below the bottom surface of large-span foundation ditch, upper segment fender pile including extend into hypomere fender pile in and with many even main muscle of steel reinforcement cage fixed connection, the periphery of main muscle is from last to having strengthened the hoop down to interval connection in proper order, strengthen the hoop including four angle steel that are "L", have the interval between the adjacent angle steel and through steel sheet welded connection together and cladding in the periphery of many main muscle between the adjacent angle steel, the lower terminal surface of main muscle stretches into below the bottom surface of large-span foundation ditch.
In some embodiments, the wale comprises a wale steel bar hoop and concrete poured on the periphery of the wale steel bar hoop, the wale steel bar hoop comprises two first steel bars which are parallel to each other, extend into the upper section supporting pile and are fixedly connected with a main bar and a reinforcing hoop of the upper section supporting pile, the wale steel bar hoop further comprises two second steel bars which are obliquely arranged, one ends of the two second steel bars are connected with each other to form an opening used for accommodating the part of the upper section supporting pile, one ends of the two first steel bars are fixedly connected with the upper section supporting pile, the other ends of the two first steel bars are connected with the second steel bars and extend out of the second steel bars, the wale steel bar hoop further comprises a third steel bar which is horizontally arranged, and the third steel bar connects the second steel bars on the adjacent upper section supporting piles together. That is to say, one end interconnect of two second reinforcing bars on each fender pile, the other end of second reinforcing bar is connected with a second reinforcing bar on the adjacent fender pile through the third reinforcing bar.
In some embodiments, the position of the wale on the support pile and the position of the reinforcement hoop on the support pile correspond to each other. That is to say, the wale is connected with the reinforcing hoop on the upper supporting pile.
In some embodiments, a support plate in an "L" shape for supporting the horizontal support beam is welded to the bottom surface of the reinforcement hoop corresponding to the wale. That is to say, one side plate of the L-shaped supporting plate is connected with the reinforcing hoop, and the upper end surface of the other side plate of the L-shaped supporting plate is just level with the bottom surface of the horizontal supporting beam.
In some embodiments, the rebar within the horizontal support beam extends into the wale and interconnects with a wale rebar hoop of the wale.
In some embodiments, a horizontal support beam perpendicular to the wale is connected to the wale, or a horizontal support beam inclined to the wale is connected to the wale, or a horizontal support beam perpendicular to the wale and a horizontal support beam inclined to the wale are connected to the wale.
In some embodiments, if a horizontal support beam is connected to the wale, an armboard is connected between the wale and the horizontal support beam, and two ends of the steel bar in the armboard are respectively connected with the wale steel bar hoop of the wale and the steel bar in the horizontal support beam; if the waist beam is connected with at least two horizontal supporting beams, armpit plates are arranged between the waist beam and the horizontal supporting beams and between the horizontal supporting beams, and two ends of the reinforcing steel bars in the armpit plates are respectively implanted into the waist beam and the horizontal supporting beams adjacent to the armpit plates or into the two horizontal supporting beams adjacent to the armpit plates.
Compared with the prior art, the utility model discloses following beneficial effect has:
the large-span foundation pit inner supporting structure can save the construction amount of the large-span foundation pit inner support compared with the prior art on the premise of ensuring the stability of the large-span foundation pit support; meanwhile, according to the favorable characteristics of the periphery of the foundation pit, a single large span is adopted for supporting, so that the influence on later-stage main structure construction is avoided; the use amount of concrete and steel bars is reduced, the construction period is shortened, the construction cost is reduced, and the development direction of the green deep foundation pit is met.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the support structure in a large-span foundation pit according to the present invention;
fig. 2 is a schematic structural view of a reinforcing hoop of an upper support pile of the present invention;
FIG. 3 is a schematic view of the connection of the support piles, the wale and the horizontal support beam of the present invention;
fig. 4 is a schematic structural view of a top view of the wale and the support piles when the wale is connected to the support piles according to the present invention;
fig. 5 is a schematic structural view of an embodiment of the present invention when the wale is connected to the horizontal supporting beam, in which the wale is connected to the horizontal supporting beam perpendicular to the wale, and it can be seen from the schematic view that two ends of the reinforcing bar of the armboard are respectively embedded into the wale and the horizontal supporting beam;
fig. 6 is a schematic structural view of an embodiment of the present invention when a wale is connected to a horizontal supporting beam, in which a horizontal supporting beam inclined to the wale is connected to the wale, and it can be seen from the schematic view that two ends of a reinforcing bar of an armboard are respectively embedded in the wale and the horizontal supporting beam;
fig. 7 is a schematic structural view of an embodiment of the present invention when a wale is connected to a horizontal support beam, in which a horizontal support beam perpendicular to the wale and two horizontal support beams inclined to the wale are connected to the wale, and it can be seen from the schematic view that two ends of the steel bar of the armpit between the wale and the horizontal support beam are respectively embedded into the wale and the horizontal support beam, and two ends of the steel bar of the armpit between the horizontal support beam and the horizontal support beam are respectively embedded into two adjacent horizontal support beams;
the labels in the figure are: 1. the supporting pile comprises a supporting pile body 11, an upper supporting pile body 111, main ribs 112, reinforcing hoops 113, angle steel 114, a steel plate 12, a lower supporting pile body 2, a waist beam 21, first reinforcing steel bars 22, second reinforcing steel bars 23, third reinforcing steel bars 3, a horizontal supporting beam 4, reinforcing plates 5, water stop plates 6 and armpits.
Detailed Description
The present invention will be further described with reference to the following examples, which are only some, but not all, of the examples of the present invention. Based on the embodiments in the present invention, other embodiments used by those skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
With reference to the accompanying drawings, the utility model provides a large-span foundation pit internal support structure, including a plurality of support piles 1 arranged along the periphery of the foundation pit, the top of each support pile 1 is connected together through a crown beam (the crown beam is not shown in the accompanying drawings, the crown beam is the reinforced concrete structure connected to the top of each support pile 1, and is used for connecting each support pile together to form a whole, and those skilled in the art can understand and understand the whole, and will not be described herein again); a plurality of waist beams 2 are sequentially arranged on each supporting pile 1 from top to bottom at intervals, the waist beams 2 connect the supporting piles 1 together, and each waist beam 2 is connected with a horizontal supporting beam 3 formed by pouring reinforced concrete; the fender pile 1 includes upper segment fender pile 11 and hypomere fender pile 12, hypomere fender pile 12 is for pouring the bored concrete pile that forms by the steel reinforcement cage and hypomere fender pile 12 is located below the bottom surface of large-span foundation ditch, upper segment fender pile 11 is including extending into in hypomere fender pile 12 and with many even main muscle 111 of steel reinforcement cage fixed connection, the periphery of main muscle 111 has from last to having strengthened hoop 112 down in proper order, it includes four angle steel 113 that are "L", has the interval between the adjacent angle steel 113 and through steel sheet 114 welded connection together and cladding in the periphery of many main muscle 111 between the adjacent angle steel 113, the lower terminal surface of main muscle 111 stretches into below the bottom surface of large-span foundation ditch, it is that main muscle 111 extends to in the hypomere fender pile 12 promptly.
In some embodiments, the angle iron 113 and the steel plate 114 are made of Q235B, and the reinforcing hoop 112 should be connected by butt welding during welding. The spacing distance of the reinforcing bead 112 on the main rib 111 may be set to 600 mm.
In some embodiments, the wale 2 comprises a wale steel hoop and concrete poured around the wale steel hoop, the wale reinforcement hoop 2 comprises a longitudinal wale reinforcement hoop and a transverse wale reinforcement hoop, the longitudinal wale reinforcement hoop comprises first reinforcements 21, second reinforcements 22 and third reinforcements 23, the two first reinforcements 21 which are parallel to each other extend into the upper section supporting pile 1 and are fixedly connected with a main reinforcement 111 and a reinforcing hoop 112 of the upper section supporting pile, the two second reinforcements 22 are arranged in a mutually inclined manner, one ends of the two second reinforcements 22 are connected together and form an opening for accommodating part of the upper section supporting pile 11, one ends of the two first reinforcements 21 are fixedly connected with the upper section supporting pile 11, the other ends of the two first reinforcements 21 are connected with the second reinforcements 22 and extend out of the second reinforcements 22, the third reinforcing bars 23 connect the second reinforcing bars 22 of the adjacent upper-section support piles 11 together. That is to say, one end interconnect of two second reinforcing bars on each fender pile, the other end of second reinforcing bar is connected with a second reinforcing bar on the adjacent fender pile through the third reinforcing bar. Wherein, the transverse reinforcement hoops on the wale reinforcement hoops are laid along the arrangement direction of the support piles 1, so that the support piles are connected together to form a whole.
In some embodiments, the position of the wale 2 on the support pile 1 and the position of the reinforcing hoop 111 on the support pile 1 correspond to each other. That is, the wale 2 is connected to the reinforcing hoop 111 of the upper support pile 1.
In some embodiments, the bottom surface of the reinforcing hoop 111 corresponding to the wale 2 is welded with a support plate 4 having an "L" shape for supporting the horizontal support beam 3. That is, one side plate of the L-shaped supporting plate 4 is connected to the reinforcing hoop 112, and the upper end surface of the other side plate of the L-shaped supporting plate 4 is exactly flush with the bottom surface of the horizontal supporting beam 3. In some embodiments, one side of the "L" -shaped supporting plate 4 is welded inside the upper supporting piles 11, and the other side of the "L" -shaped supporting plate extends into the upper supporting piles 11 and is welded with the side welded inside the upper supporting piles 11, so as to improve the supporting strength of the supporting plate.
In some embodiments, the rebar within the horizontal support beam 3 extends into the wale 2 and interconnects with the wale rebar hoop of the wale 2.
Referring to fig. 5 to 7, in some embodiments, a horizontal support beam 3 perpendicular to the wale 2 is connected to the wale 2, or a horizontal support beam 3 inclined to the wale 2 is connected to the wale 2, or a horizontal support beam 3 perpendicular to the wale 2 and a horizontal support beam 3 inclined to the wale 2 are connected to the wale 2.
In some embodiments, if a horizontal support beam 3 is connected to the wale 2, an armboard 6 is connected between the wale 2 and the horizontal support beam 3, and two ends of the steel bar in the armboard 6 are respectively connected with the wale steel bar hoop of the wale 2 and the steel bar in the horizontal support beam 3; if the wale 2 is connected with at least two horizontal supporting beams 3, armpit plates 6 are arranged between the wale 2 and the horizontal supporting beams 3 and between the horizontal supporting beams 3 and the horizontal supporting beams 3, and two ends of the steel bars in the armpit plates 6 are respectively implanted into the wale 2 adjacent to the armpit plate 4 and the horizontal supporting beams 3 or into the two horizontal supporting beams 3 adjacent to the armpit plate 6. Thereby ensuring the connection strength between the wale and the horizontal support beam.
The large-span foundation pit inner supporting structure can save the construction amount of the large-span foundation pit inner support compared with the prior art on the premise of ensuring the stability of the large-span foundation pit support; meanwhile, according to the favorable characteristics of the periphery of the foundation pit, a single large span is adopted for supporting, so that the influence on later-stage main structure construction is avoided; the use amount of concrete and steel bars is reduced, the construction period is shortened, the construction cost is reduced, and the development direction of the green deep foundation pit is met.
The utility model discloses a construction method of large-span foundation ditch inner support structure includes:
(1) leveling the field; leveling a construction site, and clearing away ground obstacles; numbering and drawing supporting pile holes, and compiling a drilling operation route map; and completing equipment debugging, inspection, material acceptance and test preparation.
(2) Construction and paying-off; and accurately positioning the hole positions of the support piles according to the construction drawing and the serial numbers, marking, and performing recheck inspection.
(3) Burying monitoring points; the burying of the monitoring points belongs to the prior art, and the monitoring points can be understood and understood by technical personnel in the field, namely, in the process of foundation pit excavation and underground engineering construction, the geotechnical characteristics of the foundation pit, the displacement of a supporting structure and the change of surrounding environment conditions are observed and analyzed, monitoring results are fed back in time, the deformation and the development of a stable state which are caused after further construction are predicted, and the degree of influence of construction on the surrounding environment is judged according to prediction to guide design and construction.
(4) Constructing a dewatering well; the dewatering well is designed mainly for discharging underground water, the underground water is prevented from permeating into a foundation pit when the foundation pit is excavated, and the inside of the foundation pit is ensured to be dry, so that construction is facilitated and the construction safety is improved.
(5) Constructing a support pile;
mechanical hole forming should be performed first; according to the measurement line map of paying-off and drilling operation, the drilling machine enters a field and is in place, the drill bit is aligned with the anchor rod position identification point, the levelness of the frame of the drilling machine and the verticality of the vertical shaft are adjusted, and the drilling machine is stabilized after the requirements on the levelness and the verticality are met; drilling with a drilling machine along with a pipe, impacting to form a hole, removing slag along with the drilling process, stopping drilling after the designed depth is reached, and not stopping the drilling, wherein the drilling depth is not more than 500 mm. After the pile hole is finished, sediment and hole wall mud skin in the pile hole are required to be cleaned, and the hole cleaning requirement is met. And after the hole depth, the hole position, the hole diameter deviation and the pile hole deflection are accepted, the enclosure treatment is carried out within the range of 20cm of the hole opening, so that slag and sewage are prevented from entering the hole.
And then welding the upper supporting pile and the lower supporting pile, putting the welded upper supporting pile and lower supporting pile into the pile hole, vertically putting the welded upper supporting pile and lower supporting pile into the pile hole, and paying attention to verticality in the installation process so as to avoid slag generated by impacting the hole wall from falling into the hole.
And finally, pouring the lower section of the support pile 12, namely pouring cement paste into the part below the designed elevation of the foundation pit, thereby completing the construction of the support pile.
(6) Construction of a crown beam, ground hardening and precipitation;
(7) performing first-layer earthwork excavation, performing inter-pile soil support in the first-layer earthwork excavation process, and then performing construction of a first-layer waist beam and a first-layer horizontal support beam;
(8) continuing to excavate earthwork downwards, constructing a second layer of waist beam and a second layer of horizontal supporting beam according to the set requirements, and circulating in this way until the construction of the waist beam at the lowest layer and the horizontal supporting beam at the lowest layer is completed; when the waist beam and the horizontal supporting beam on the same layer are poured, the waist beam and the horizontal supporting beam are integrally poured.
(9) And continuously downwards excavating to the designed elevation of the foundation pit and constructing a bottom drainage ditch. And a water stop plate should be welded to the lower support piles 12.
The utility model discloses in the work progress, before the horizontal support beam was dismantled to needs, should construct earlier on a fender pile and trade the brace belt, then dismantle again and hang horizontal support beam to the construction safety when ensureing to demolish horizontal support beam.
Claims (7)
1. A large-span foundation pit inner support structure is characterized by comprising a plurality of supporting piles arranged along the periphery of a foundation pit, wherein the tops of the supporting piles are connected together through crown beams, a plurality of waist beams are sequentially arranged on each supporting pile from top to bottom at intervals, the waist beams connect the supporting piles together, and each waist beam is connected with a horizontal supporting beam formed by pouring reinforced concrete; the fender pile includes upper segment fender pile and hypomere fender pile, hypomere fender pile is for pouring the bored concrete pile that forms by the steel reinforcement cage and hypomere fender pile is located below the bottom surface of large-span foundation ditch, upper segment fender pile including extend into hypomere fender pile in and with many even main muscle of steel reinforcement cage fixed connection, the periphery of main muscle is from last to having strengthened the hoop down to interval connection in proper order, strengthen the hoop including four angle steel that are "L", have the interval between the adjacent angle steel and through steel sheet welded connection together and cladding in the periphery of many main muscle between the adjacent angle steel, the lower terminal surface of main muscle stretches into below the bottom surface of large-span foundation ditch.
2. The large-span foundation pit internal support structure of claim 1, wherein the wale comprises a wale reinforcement hoop and concrete poured around the wale reinforcement hoop, the wale reinforcement hoop comprises two first reinforcement bars which are parallel to each other, extend into the upper section support pile and are fixedly connected with the main reinforcement bars and the reinforcement hoop of the upper section support pile, the wale reinforcement hoop further comprises two second reinforcement bars which are obliquely arranged, one ends of the two second reinforcement bars are connected with each other and form an opening for accommodating the upper section support pile, one ends of the two first reinforcement bars are fixedly connected with the upper section support pile, the other ends of the two first reinforcement bars are connected with the second reinforcement bars and extend out of the second reinforcement bars, the wale reinforcement hoop further comprises a horizontally arranged third reinforcement bar, and the third reinforcement bar connects the second reinforcement bars on the adjacent upper section support piles together.
3. The support structure in a large-span foundation pit according to claim 1, wherein the position of the wale on the support pile corresponds to the position of the reinforcement hoop on the support pile.
4. The large-span foundation pit inner support structure according to claim 3, wherein a support plate in an L shape for supporting a horizontal support beam is welded to the bottom surface of the reinforcement hoop corresponding to the wale.
5. The large-span foundation pit internal support structure of claim 2, wherein the reinforcing bars in the horizontal support beams extend into the wale and are interconnected with the wale reinforcing hoops of the wale.
6. The support structure in a large-span foundation pit according to any one of claims 2-5, wherein a horizontal support beam perpendicular to the wale is connected to the wale, or a horizontal support beam inclined to the wale is connected to the wale, or a horizontal support beam perpendicular to the wale and a horizontal support beam inclined to the wale are connected to the wale.
7. The large-span foundation pit inner support structure of claim 6, wherein if a horizontal support beam is connected to the wale, an armboard is connected between the wale and the horizontal support beam, and two ends of the steel bar in the armboard are respectively connected with a wale steel bar hoop of the wale and the steel bar in the horizontal support beam; if the waist beam is connected with at least two horizontal supporting beams, armpit plates are arranged between the waist beam and the horizontal supporting beams and between the horizontal supporting beams, and two ends of the reinforcing steel bars in the armpit plates are respectively implanted into the waist beam and the horizontal supporting beams adjacent to the armpit plates or into the two horizontal supporting beams adjacent to the armpit plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120330882.3U CN214940189U (en) | 2021-02-05 | 2021-02-05 | Large-span foundation pit inner supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120330882.3U CN214940189U (en) | 2021-02-05 | 2021-02-05 | Large-span foundation pit inner supporting structure |
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| Publication Number | Publication Date |
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| CN214940189U true CN214940189U (en) | 2021-11-30 |
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| CN202120330882.3U Active CN214940189U (en) | 2021-02-05 | 2021-02-05 | Large-span foundation pit inner supporting structure |
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- 2021-02-05 CN CN202120330882.3U patent/CN214940189U/en active Active
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