CN217517597U - Compound supporting construction of deep basal pit - Google Patents
Compound supporting construction of deep basal pit Download PDFInfo
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- CN217517597U CN217517597U CN202220878496.2U CN202220878496U CN217517597U CN 217517597 U CN217517597 U CN 217517597U CN 202220878496 U CN202220878496 U CN 202220878496U CN 217517597 U CN217517597 U CN 217517597U
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Abstract
The utility model relates to a construction supporting construction technical field, concretely relates to compound supporting construction of deep basal pit. The mixing pile of the row pile retaining assembly in the composite supporting structure system is embedded in the side wall of the foundation pit in the direction parallel to the depth of the foundation pit. The mixing piles are arranged along the edge of the foundation pit to form a row pile structure. The struts are embedded in the mixing piles, and the tops of the adjacent struts are connected through the crown beams. The side wall of the crown beam is provided with a first transmission case. The upright posts in the supporting component are arranged in parallel with the support posts. The bottoms of the stand columns are connected with the bottom of the foundation pit, and the adjacent stand columns are connected through the cross beam. One end of the supporting beam is connected with the side wall of the cross beam. The other end of the supporting beam is connected with the second force transmission box. The prestress adjusting device applies prestress between the row pile retaining assembly and the supporting assembly, further strengthens the structural supporting strength of the side wall of the deep foundation pit, optimizes the supporting structure, reduces the construction difficulty, improves the construction efficiency and improves the recycling rate of supporting materials.
Description
Technical Field
The utility model relates to a construction supporting construction technical field, concretely relates to compound supporting construction of deep basal pit.
Background
With the rapid development of the building industry, the requirements for underground space development and application are continuously expanded, and the foundation pit is excavated deeper and deeper, so that the requirements on the safety level of the side wall of the foundation pit and the strength and rigidity of the foundation pit support are higher and higher. The deep foundation pit refers to excavation engineering with excavation depth of 5m and more than 5m, or 3 layers and more than 3 layers of the basement. In addition, when the geological conditions and the surrounding environment are complicated, the excavation work may be called a deep foundation pit.
In order to ensure the safety in the construction process of the deep foundation pit, the side wall of the deep foundation pit is usually supported by a reinforced concrete structure in the prior art. For example, underground continuous walls are constructed around a deep foundation pit, and an internal support structure having vertical and horizontal connections is formed between the underground continuous walls by using a concrete structure. Above-mentioned supporting construction to deep basal pit formation support not only has consumed a large amount of foundation construction materials because construction volume is big, has still occupied a large amount of spaces at deep basal pit top, has compressed the working space of excavation equipment. In addition, the process of breaking the supporting structure after the construction of the deep foundation pit is finished still consumes a large amount of manpower and material resources, the investment of construction cost is further increased, and the resource waste is caused.
To sum up, at the in-process of deep basal pit construction, how to design a supporting construction for strengthen the structural support intensity to the deep basal pit lateral wall, reduce the construction degree of difficulty, improve the efficiency of construction, further promote the recycle who supports the material, just become the technical problem that the skilled person in the art needs a urgent need to solve.
Disclosure of Invention
An object of the utility model is to provide a supporting construction for the in-process of deep basal pit construction for strengthen the structural support intensity to the deep basal pit lateral wall, reduce the construction degree of difficulty, improve the efficiency of construction, further promote supporting material's recycle ratio.
In order to achieve the above purpose, the utility model adopts the following scheme: the deep foundation pit composite supporting structure comprises a row pile retaining assembly, a supporting assembly and a prestress adjusting device;
the row pile retaining assembly comprises stirring piles, struts and a top beam, wherein the stirring piles are embedded into the side wall of the foundation pit in a direction parallel to the depth direction of the foundation pit, the stirring piles are arranged along the edge of the foundation pit to form a row pile structure, the struts are embedded into the stirring piles, the tops of adjacent struts are connected through the top beam, and a first power transmission box is arranged on the side wall of the top beam;
the supporting assembly comprises upright columns, cross beams, supporting beams and a second force transmission box, the upright columns are arranged in parallel to the supporting columns, the bottoms of the upright columns are connected with the bottom of the foundation pit, the adjacent upright columns are connected through the cross beams, one end of each supporting beam is connected with the side wall of each cross beam, the other end of each supporting beam is connected with the second force transmission box, and a channel for placing a prestress adjusting device is arranged between each second force transmission box and the first force transmission box;
the base of the prestress adjusting device is connected with the side wall of the first force transmission box, and the telescopic end of the prestress adjusting device is connected with the side wall of the second force transmission box.
Preferably the bottom of the first transfer case is provided with bracket assemblies which are connected to the side walls of the column. So set up, bracket assembly is used for forming the auxiliary stay to the bottom of first biography power case, has improved the structural stability that row pile kept off the subassembly, and then is favorable to prestressing force adjusting device to pass power the case through first biography power case to the second and applys prestressing force, has further strengthened the support strength of composite support structure system.
Preferably, the crown beam is provided with a concrete layer, longitudinal steel bars and transverse steel bars are embedded in the concrete layer, and an embedded assembly is embedded in one side, located on the first power transmission case, of the concrete layer. So set up, longitudinal reinforcement and horizontal reinforcing bar are used for strengthening the joint strength on concrete layer, and then have promoted the global rigidity of hat roof beam, and pre-buried subassembly is used for linking to each other with the lateral wall of first transfer case, has reduced the assembly degree of difficulty between first transfer case and the hat roof beam, has further improved the efficiency of construction.
Preferably, the embedded assembly comprises anchor bars, connecting pieces and connecting bolts, one ends of the anchor bars are welded with the longitudinal steel bars, the other ends of the anchor bars are connected with the connecting pieces, and threaded holes matched with the connecting bolts are formed in the end portions of the connecting pieces. So set up, be convenient for connecting bolt implements quick installation to first power transmission case and hat roof beam, and the anchor bar is used for further strengthening the joint strength between embedded component and the hat roof beam, and then has guaranteed the joint strength between first power transmission case and the hat roof beam.
Preferably, one end of the support beam is connected to the second transfer box by a first fastening assembly and the other end of the support beam is connected to the cross-beam by a second fastening assembly. So set up, the quick installation and the dismantlement of the supporting component of being convenient for are favorable to accomplishing deep basal pit construction back, pass the recovery of power case and crossbeam to a supporting beam, second.
Preferably, the bottom of the cross beam is provided with a support, the side wall of the support is connected with the side wall of the upright post through a third fastening assembly, and the top of the support is connected with the bottom of the cross beam through a fourth fastening assembly. So set up, the support is used for further improving the joint strength between crossbeam and the stand, and then has promoted supporting component's bulk rigidity to form the support to the lateral wall of deep basal pit better.
Preferably, the prestress adjusting device is a jack, a base of the jack is connected with the side wall of the first force transmission box, and a telescopic end of the jack is connected with the side wall of the second force transmission box. So set up, the jack of being convenient for applys prestressing force step by step between row stake fender subassembly and supporting component, at the in-process of applying prestressing force, is favorable to producing not hard up junction to composite support structure system and implements further fastening, has further strengthened the structure support intensity to the deep basal pit lateral wall.
Preferably, a support box is arranged in the channel, and the end parts of the support box are respectively connected with the side wall of the first force transmission box and the side wall of the second force transmission box. So set up, the support box is used for bearing the prestressing force between row's stake backstop subassembly and the supporting component, and after prestressing force loading is accomplished, be convenient for tear the jack off from the passageway.
The utility model provides a pair of deep basal pit composite supporting construction compares with prior art, has following substantive characteristics and progress: this deep basal pit composite supporting structure utilizes prestressing force adjusting device to exert prestressing force between campshed fender subassembly and supporting component, further strengthened the structural support intensity to the deep basal pit lateral wall, the pillar, the hat roof beam, the stand, crossbeam and a supporting beam's structural design, supporting structure has been optimized, the construction degree of difficulty has been reduced, construction efficiency has been improved, a large amount of templates have been saved, the reinforcing bar, the concrete work, and the broken process of removing in construction later stage has been avoided, greatly reduced noise pollution and raise dust pollution, little to the environmental impact, the recycle who has promoted supporting material, accord with the new theory of the green energy-conserving development of building industry.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a novel deep foundation pit composite supporting system in an embodiment of the present invention;
fig. 2 is a reference diagram of a use state of the novel deep foundation pit composite supporting system in fig. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is an enlarged partial schematic view at A of FIG. 3;
FIG. 5 is a schematic view of a connection structure of the crown beam and the first transfer case;
FIG. 6 is a schematic view showing a connection structure of the support beam;
FIG. 7 is an enlarged partial schematic view at B of FIG. 6;
fig. 8 is a schematic structural diagram of the embedded assembly.
Reference numerals: the pile comprises a mixing pile 1, a support column 2, a crown beam 3, a first force transmission box 4, a bracket assembly 5, a supporting box 6, a jack 7, a second force transmission box 8, a supporting beam 9, a vertical column 10, a cross beam 11, a support 12, a foundation pit earthwork 13, a pre-embedded assembly 14, a first fastening assembly 15, a second fastening assembly 16, a third fastening assembly 17, a fourth fastening assembly 18, a connecting bolt 19, a concrete layer 31, a longitudinal reinforcing steel bar 32, a transverse reinforcing steel bar 33, an anchor bar 141 and a connecting piece 142.
Detailed Description
The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
The composite supporting structure for the deep foundation pit is used for enhancing the structural supporting strength of the side wall of the deep foundation pit in the process of deep foundation pit construction, reducing the construction difficulty and improving the construction efficiency. This deep basal pit composite supporting structure utilizes prestressing force adjusting device to exert prestressing force between row's pile retaining subassembly and supporting component, has further strengthened the structural support intensity to the deep basal pit lateral wall. The structural design of pillar, stand, crossbeam and a supporting beam adopts the high strength shaped steel of factory's modularization processing, can realize the assembled construction after transporting to the scene, has optimized bearing structure, has reduced the construction degree of difficulty, has improved the efficiency of construction. A large amount of templates, steel bars and concrete operations are saved, the breaking process in the later construction period is avoided, the noise pollution and the dust pollution are greatly reduced, the environmental influence is small, and the recycling rate of the supporting materials is improved.
As shown in fig. 1, a deep foundation pit composite supporting structure includes a row pile retaining assembly, a supporting assembly and a prestress adjusting device. As shown in connection with fig. 2, the row pile retaining assembly comprises a mixing pile 1, a pillar 2 and a crown beam 3. The mixing pile 1 is embedded in the side wall of the foundation pit in the direction parallel to the depth of the foundation pit. The mixing piles 1 are arranged along the edge of the foundation pit to form a row pile structure. The support column 2 is embedded in the mixing pile 1. The tops of adjacent pillars 2 are connected by a crown beam 3. The side wall of the crown beam 3 is provided with a first force transmission box 4.
As shown in fig. 2, the support assembly comprises a column 10, a beam 11, a support beam 9 and a second transfer box 8. The uprights 10 are arranged parallel to the uprights 2. The bottom of the column 10 is connected to the bottom of the foundation pit. As shown in fig. 3, adjacent columns 10 are connected by a cross beam 11. One end of the support beam 9 is connected to a side wall of the cross beam 11. The other end of the support beam 9 is connected to a second transfer box 8. Between the second transfer box 8 and the first transfer box 4 there is a passage for the prestress adjusting device.
As shown in fig. 3, the base of the prestress adjusting device is connected to the side wall of the first transfer case 4. The telescopic end of the prestress adjusting device is connected with the side wall of the second force transmission box 8.
The pillars 2, the columns 10, the beams 11 and the supporting beams 9 are all made of high-strength steel processed in a factory modularization mode, assembly type construction can be achieved after the pillars are transported to the site, and meanwhile recycling after construction is facilitated. For example, the pillars 2 and the columns 10 are made of H-shaped steel with the model number of HN 700 × 300 × 13 × 24, the beams 11 are made of H-shaped steel with the model number of HN 300 × 300 × 10 × 15, and the support beams 9 are made of H-shaped steel with the model number of HN 400 × 400 × 13 × 21 and welded with the end plates.
The embodiment of the utility model provides a deep basal pit composite supporting construction who proposes supports through hat roof beam and biography power case complex with worker's method stake and shaped steel combination together, and the shear force that the connected node department that hat roof beam and shaped steel supported received is the biggest. The reinforced concrete shear pier can be arranged along the stress direction in construction to resist shear load.
As shown in fig. 4, the prestress adjusting means is a jack 7. The base of the jack 7 is connected to the side wall of the first transfer case 4. The telescopic end of the jack 7 is connected with the side wall of the second force transmission box 8. So set up, be convenient for jack 7 applys prestressing force step by step between row pile retaining subassembly and supporting component, at the in-process of applying prestressing force, is favorable to producing not hard up junction to composite support structure system and implements further fastening, has further strengthened the structure support intensity to the deep basal pit lateral wall. For example, the jack 7 may be a hydraulic jack.
A support box 6 is arranged in the channel. The ends of the support box 6 are connected to the side walls of the first transfer box 4 and the second transfer box 8, respectively. So arranged, the support box 6 is used for bearing the prestress between the pile guide assembly and the support assembly, and after the prestress loading is finished, the jack 7 is convenient to be detached from the channel.
As shown in fig. 5, the crown beam 3 has a concrete layer 31. Concrete layer 31 has embedded therein longitudinal reinforcements 32 and transverse reinforcements 33. The concrete layer 31 is embedded with the embedded component 14 at one side of the first transmission case 4. So set up, longitudinal reinforcement 32 and transverse reinforcement 33 are used for strengthening concrete layer 31's joint strength, and then have promoted hat roof beam 3's bulk rigidity, and pre-buried subassembly 14 is used for linking to each other with the lateral wall of first biography power case 4, has reduced the assembly degree of difficulty between first biography power case 4 and the hat roof beam 3, has further improved the efficiency of construction.
As shown in figure 6, one end of the support beam 9 is connected to the second transfer box 8 by a first fastening assembly 15. The other end of the support beam 9 is connected to the cross beam 11 by a second fastening assembly 16. So set up, the quick installation and the dismantlement of the supporting component of being convenient for are favorable to accomplishing deep basal pit construction back, to supporting beam 9, second pass power case 8 and crossbeam 11's recovery. The bottom of the beam 11 is provided with a support 12. The side walls of the support 12 are connected to the side walls of the upright 10 by means of a third fastening assembly 17. The top of the support 12 is connected to the bottom of the beam 11 by a fourth fastening assembly 18. So set up, support 12 is used for further improving the joint strength between crossbeam 11 and the stand 10, and then has promoted supporting component's bulk rigidity to form the support to the lateral wall of deep basal pit better.
As shown in fig. 6 in combination with fig. 7, the first fastening member 15, the second fastening member 16, the third fastening member 17 and the fourth fastening member 18 are each composed of a bolt, a nut, an elastic pad and a flat pad. And selecting fasteners of different sizes and types according to the requirement of design strength.
As shown in fig. 2, the bottom of the first force transfer box 4 is provided with a bracket assembly 5. The bracket assembly 5 is connected to the side wall of the strut 2. So set up, bracket assembly 5 is used for forming the auxiliary stay to the bottom of first biography power case 4, has improved the structural stability that the campshed kept off the subassembly, and then is favorable to prestressing force adjusting device to pass power case 8 to the second through first biography power case 4 and applys prestressing force, has further strengthened the support intensity of composite support structure system.
As shown in fig. 8, the fastener insert 14 includes anchor bars 141, connecting members 142, and connecting bolts 19. As shown in fig. 5, one end of the anchor bar 141 is welded to the longitudinal reinforcing bar 32. The other end of the anchor bar 141 is connected to the connecting member 142. The end of the connecting piece 142 is provided with a threaded hole matching the connecting bolt 19. So set up, be convenient for connecting bolt 19 to first pass force box 4 and crown beam 3 implementation quick installation. The anchor bars 141 are used for further enhancing the connection strength between the embedded component 14 and the crown beam 3, so that the connection strength between the first force transmission box 4 and the crown beam 3 is ensured.
The embodiment of the utility model provides an in deep basal pit composite supporting construction's stirring stake 1 mainly uses the triaxial mixer, after boring the certain degree of depth of the soil body, mix the stirring repeatedly through blowout cement reinforcer and foundation ditch earthwork 13, insert pillar 2 as its stress reinforcement material before treating the cement soil mixture initial set, after the cement soil solidification and stress reinforcement material combined action, form one continuous complete, have high strength high rigidity, seamless underground wall, when as the waterproof curtain, do foundation ditch supporting construction concurrently.
When the mixing pile 1 is constructed, attention should be paid to: a product qualification certificate and a detection qualification certificate are provided before a pile driver enters a field, pile testing is carried out before the construction of the three-axis deep mixing pile, and a control method for determining cement using amount, water cement ratio, slurry pumping time, drill rod sinking and lifting time, pile length and verticality is used as a construction standard for controlling the three-axis deep mixing pile.
When the triaxial deep mixing pile is constructed, the time for pile-to-pile construction lap joint is less than or equal to 24 hours. If the lapping is overtime, the stirring speed of the drill rod needs to be slowed down in the lapping construction so as to ensure the lapping quality of the pile body. If the overlap joint is not available or poor due to too long time, the cold seam treatment is regarded as cold seam treatment and the record is made, and after the confirmation of a design unit, technical measures such as pile repairing or jet grouting are taken to ensure the forming quality of the mixing pile.
The service time of the prepared cement paste is not more than 2h, the cement paste with the shelf time of more than 2h is treated as waste slurry, and the slurry is strictly forbidden to be cut off in the construction process of the pile body. If the slurry is broken due to reasons, the drill rod is sunk to be 0.5m below the cement-soil mixed liquid level before slurry supply is recovered, and then grouting and stirring are carried out, so that the continuity of the pile body is ensured. And (4) checking and accepting materials such as cement, H-shaped steel and the like on site and collecting product qualification certificates. And (4) performing spot inspection on the cement raw material, and using the cement raw material after the cement raw material is detected to be qualified. And (5) carrying out field verification on the H-shaped steel welding process, and carrying out flaw detection on the welding seam.
After the triaxial deep stirring pile is constructed for one circle, core check is carried out, and if the pile quality does not meet the design requirement, the construction process is adjusted in time. The strength of the waterproof curtain after pile forming is comprehensively evaluated by adopting methods such as test block test, coring and the like.
When the prestress adjusting device applies prestress, the method comprises the following steps: after the section steel support is installed, a closed stress system is formed, prestress is applied, before the prestress is applied, attention is paid to the connection state of the force transmission box and the crown beam, and the connection state of the force transmission box and the section steel support, and whether bolts at the connection position of each component are fastened or not is checked; jacks are symmetrically arranged on two sides of the profile steel support axis for synchronous pressure application, and the pressure application points of the jacks and the profile steel combined inner support axis are kept in the same straight line, so that the pressure balance of the profile steel support is ensured; and (3) applying prestress in stages, after the first-stage pressure loading is finished and the pressure is kept stable (the stabilization time is more than or equal to 10min), applying pressure in the next stage, and locking the jack after the prestress application reaches a design value and the pressure is ensured to be stable and balanced.
In the prestress loading process, if conditions such as bolt looseness of a connecting position, cracking of a welding point of the section steel, local bending deformation of a section steel support and the like occur, pressure must be released immediately. After the abnormal part is processed, the pressure can be applied again. If the supporting box is arranged at the position where the section steel supports and pressurizes, the jack can be taken out after pressurizing is finished; if the force-retaining box is not arranged, the jack is retained and locked after the pressure application is finished.
The utility model discloses not be limited to the concrete technical scheme that above-mentioned embodiment said, except above-mentioned embodiment, the utility model discloses can also have other embodiments. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention.
Claims (8)
1. A deep foundation pit composite supporting structure is characterized by comprising a row pile retaining assembly, a supporting assembly and a prestress adjusting device;
the row pile retaining assembly comprises stirring piles, struts and a crown beam, wherein the stirring piles are embedded in the side wall of the foundation pit in the direction parallel to the depth direction of the foundation pit, the stirring piles are arranged along the edge of the foundation pit to form a row pile structure, the struts are embedded in the stirring piles, the tops of adjacent struts are connected through the crown beam, and the side wall of the crown beam is provided with a first transmission case;
the supporting assembly comprises upright columns, cross beams, supporting beams and a second force transmission box, wherein the upright columns are arranged in parallel to the supporting columns, the bottoms of the upright columns are connected with the bottom of a foundation pit, the adjacent upright columns are connected through the cross beams, one end of each supporting beam is connected with the side wall of each cross beam, the other end of each supporting beam is connected with the second force transmission box, and a channel for placing a prestress adjusting device is arranged between each second force transmission box and the corresponding first force transmission box;
the base of the prestress adjusting device is connected with the side wall of the first force transmission box, and the telescopic end of the prestress adjusting device is connected with the side wall of the second force transmission box.
2. The deep foundation pit composite support structure of claim 1, wherein a bracket assembly is provided at the bottom of the first force transfer box, the bracket assembly being connected to a side wall of a column.
3. The deep foundation pit composite supporting structure of claim 1, wherein the crown beam is provided with a concrete layer, longitudinal steel bars and transverse steel bars are embedded in the concrete layer, and a pre-embedded assembly is embedded in one side of the first transmission box of the concrete layer.
4. The deep foundation pit composite supporting structure of claim 3, wherein the embedded assembly comprises anchor bars, connecting pieces and connecting bolts, one ends of the anchor bars are welded with the longitudinal steel bars, the other ends of the anchor bars are connected with the connecting pieces, and threaded holes matched with the connecting bolts are formed in the end portions of the connecting pieces.
5. The deep foundation pit composite supporting structure of claim 1, wherein one end of the supporting beam is connected with the second force transmission box through a first fastening assembly, and the other end of the supporting beam is connected with the cross beam through a second fastening assembly.
6. The deep foundation pit composite supporting structure according to claim 1, wherein a support is arranged at the bottom of the cross beam, the side wall of the support is connected with the side wall of the upright column through a third fastening assembly, and the top of the support is connected with the bottom of the cross beam through a fourth fastening assembly.
7. The deep foundation pit composite supporting structure of claim 1, wherein the prestress adjusting device is a jack, a base of the jack is connected with a side wall of the first force transmission box, and a telescopic end of the jack is connected with a side wall of the second force transmission box.
8. The deep foundation pit composite supporting structure of claim 1, wherein a supporting box is arranged in the channel, and the end parts of the supporting box are respectively connected with the side wall of the first force transmission box and the side wall of the second force transmission box.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115450221A (en) * | 2022-10-19 | 2022-12-09 | 中铁十五局集团城市轨道交通工程有限公司 | Construction method for subway crossing river channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115450221A (en) * | 2022-10-19 | 2022-12-09 | 中铁十五局集团城市轨道交通工程有限公司 | Construction method for subway crossing river channel |
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