CN110485430A - A kind of interlocking pile combines foundation pit supporting method with ground-connecting-wall - Google Patents

Abstract

The invention belongs to the technical field of foundation pit support, and relates to a foundation pit support method combined with an occlusal pile and a ground wall. Wall surface; crown beams are poured on the ground connection wall and the upper part of the occlusal piles respectively; the first support is reinforced concrete support, which is connected with the reserved steel bars on the crown beams. Concrete opposite braces and reinforced concrete diagonal braces; purlins are installed on the ground connection wall and outer wall structure according to the design elevation; the second and third supports are steel supports of a double structure, and the steel supports are connected to the purlins, and the occlusal piles and purlins are connected to each other. The combination of ground and wall can make full use of the advantages of both, and can overcome the shortcomings of both. It has good waterproof effect, flexible construction, strong impermeability, and has wide application prospects and good economic effects.

Description

A foundation pit support method combined with occlusal piles and ground-connected walls

Technical field:

The invention belongs to the technical field of foundation pit support, and in particular relates to a combined foundation pit support method of occlusal piles and ground connecting walls.

Background technique:

With the improvement of my country's economic level, traffic pressure is increasing, and deep foundation pit projects are emerging. Due to the large depth of the subway foundation pit, many surrounding buildings, and complex hydrogeological conditions, the safety requirements for foundation pit support are getting higher and higher.

At present, the commonly used deep foundation pit support forms include underground diaphragm wall and occlusal piles. Not only are there differences in support forms, but also their advantages and disadvantages are also different. The underground diaphragm wall is a foundation project that adopts a trenching machine on the ground. Along the peripheral axis of the deep excavation project, trenches are made under the condition of mud retaining walls, steel cages are hung in the trenches, and then underwater concrete is poured to form an underground diaphragm wall. The unit tank section is constructed section by section, and a continuous reinforced concrete wall is built underground as a water interception, seepage prevention, load-bearing, and water retaining structure. The construction speed of the underground diaphragm wall is fast, the vibration is small, and the noise is low. city construction. The ground connection wall has high rigidity, strong bearing capacity and high stability after excavation of the foundation pit. The wall itself has good anti-seepage performance, and is suitable for foundation pit engineering with high groundwater level and high water head pressure; the occlusal pile is part of the circumferential occlusion between adjacent concrete rows, and is hoisted into the steel cage in the occlusal pile. The overall continuous waterproof and soil retaining enclosure structure with anti-seepage effect, the reinforcement ratio of the occlusal pile is low, and the reinforcement ratio of the support structure is reduced. There is no construction cold joint mixed with soil between the occlusal piles, which has strong integrity and strong anti-seepage ability. The construction of occlusal piles is flexible and can be turned as needed, which is more suitable for the construction of foundation pit support with variable planes.

In foundation pit support engineering, the joint foundation pit support structure of occlusal pile and ground connection wall can make full use of the advantages of both, and can overcome the shortcomings of both, so it has wide application prospects and good economic effects. Therefore, it is imminent to design a reasonable and reliable foundation pit support method combined with occlusal piles and ground-connected walls.

Invention content:

The purpose of the present invention is to overcome the shortcomings of the prior art, to design and provide a combined foundation pit supporting method of occlusal piles and ground connecting walls, and to enhance the stability and safety of the supporting structure.

In order to achieve the above object, the present invention is realized through the combined support structure of the occlusal pile and the ground connection wall, and the specific process is as follows:

Step 1: Carry out the construction of occlusal piles. Note that the occlusal piles adjacent to the ground connection wall are plain piles, so that the ground connection wall and the adjacent occlusal piles are occluded. Up to the design hole bottom elevation, the piles should be hoisted with reinforcement cages after the hole inspection is qualified, and then concrete should be poured to form piles.

Step 2: Carry out the construction of the ground connection wall, set out the line of the ground connection wall to locate the guide wall construction, prepare the mud, and after the groove is formed, hang the reinforcement cage and pour the concrete to form the ground connection wall;

Step 3: Carry out the construction of the joint between the ground connection wall and the occlusal pile. When the ground connection wall is grooved, use a rotary drill to expand the width of the groove wall at least 200mm on the side close to the occlusal pile plain pile to ensure that the concrete can be poured. Flow around the back of the channel steel; use a rotary drill to remove some of the seam piles at the joints, so that the ground connection wall and the adjacent seam piles have at least 300mm of seaming, and after the wall of the seam piles are brushed, hang the steel bars cage, pouring concrete;

Step 4: Carry out crown and beam construction on the top of the occlusal pile plain pile and the top of the ground connection wall. The connected steel bars, the crown beam at the connection between the ground connection wall and the occlusal pile should be poured into one piece;

Step 5: During the construction of the crown beam, construct the first reinforced concrete support, apply the cushion, weld, bind, install the steel bars, install and reinforce the formwork, pour concrete, remove the formwork and then maintain the concrete until the support strength reaches 75% , continue to dig down;

Step 6: Carry out pile-wall combined construction, use anchoring steel bar hanging net sprayed concrete to form a sprayed concrete layer at the construction site of the occlusal pile, the thickness is not less than 100mm, and then make a mortar leveling layer on the sprayed concrete layer, the thickness is not less than 20mm, Then make a waterproof layer on the leveling layer, and finally spray the concrete layer to form the side wall;

Step 7: Install the purlin according to the design elevation, install the triangular bracket on the purlin, fasten the triangular bracket with two YG2 expansion tube bolts with a diameter of 20mm, and fill the gap between the purlin and the side wall with C30 fine stone concrete; Lift the steel purlins close to the wall, and then install YG2 expansion bolts. The steel purlins at the diagonal braces should be embedded with anti-slip parts;

Step 8: The overall splicing and hoisting of the steel support is installed by a 10t gantry crane. After the steel support is installed in place, two 100t hydraulic jacks are used for each support to pre-apply the axial force on the movable end of the steel support and lock it, and add a wedge After the block is removed, the jack is removed to complete the installation of the steel support;

Step 9: After continuing to excavate, support first and then dig, erect the third steel support in time; measure and position, anchor the triangular support, install purlins and steel supports, apply prestress, and after adding wedge blocks, remove the jack to complete the steel support. Support installation.

The main structure of the joint support structure of the occlusal pile and the ground wall includes the ground wall, the occlusal pile plain pile, the crown beam, the reinforced concrete support, the steel support, the outer wall structure, the surrounding purlin and the occlusal pile; Different engineering geological conditions and technical requirements, choose ground connection wall or occlusal pile as the main support structure. The occlusal piles adjacent to the connecting wall are occlusal piles, and the two are occluded and connected; the occlusal piles are connected with the outer wall structure to form a flat wall surface; crown beams are poured on the ground connection wall and the upper part of the occlusal piles; the first support is steel bars Concrete support, connected with the reserved steel bars on the crown beam, use reinforced concrete corner braces, reinforced concrete opposite braces, and reinforced concrete diagonal braces according to the shape and force characteristics of the foundation pit; install them on the ground connection wall and outer wall structure according to the design elevation Purlins; the second and third supports are steel supports with a double structure, and the steel supports are connected to the purlins. According to the shape and force characteristics of the foundation pit, steel support angle braces, steel support opposite braces, and steel support diagonal braces are used for reinforcement. measure.

The specific size of the underground diaphragm wall according to the present invention is determined according to the specific project and the size of the occlusal piles. Generally, the width of the underground diaphragm wall is not more than 6m, the buried depth is 10m to 50m, and the thickness is 0.5m to 1.2m, which is less than that of the adjacent occlusal piles. The diameter of the plain pile should be at least 200mm, which is convenient for the two to occlude tightly; the diameter and buried depth of the occlusal pile should be determined according to the specific project, and the diameter should not be less than 1000mm. 300mm; the diameter and buried depth of the occlusal pile shall be determined according to the specific project, the diameter shall not be less than 1000mm, and at least C45 underwater concrete shall be poured, and the interlocking between adjacent piles shall not be less than 300mm; the size of the crown beam shall be 1200×1000mm , 1500×1000mm, at least poured with C45 concrete; the type, length, and cross-sectional area of the reinforced concrete support are determined to be 800×1000mm according to the size of the foundation pit and the specific load, and poured with at least C45 concrete.

The exterior wall structure of the present invention includes a sprayed concrete layer, a mortar leveling layer, a construction waterproof layer, and a side wall. The sprayed concrete layer is formed by hanging the sprayed concrete on the anchoring steel bars inside the occlusal piles, the thickness of which is not less than 80 mm, and the sprayed concrete layer. The outer side of the mortar leveling layer is a mortar leveling layer with a thickness of not less than 20mm, and a waterproof layer is constructed outside the mortar leveling layer, and a side wall is poured outside the waterproof layer with a thickness of not less than 20mm.

The purlins of the present invention are made of combined double I-beams, usually Q235B steel, and the purlins are erected on triangular supports, and the triangular supports are connected to the ground connection wall by YG2 expansion tube bolts with a diameter of 20mm, and the connection length is not less than 280mm. Anti-slip parts are pre-embedded in the inner wall of the purlin with diagonal braces to enhance the anti-slip ability of the purlin. The anti-slip parts are welded by steel plates and steel bars. The thickness of the steel plates is not less than 20mm, and the steel bars are ribbed steel bars. The diameter is not less than 20mm.

The length, diameter, and wall thickness of the steel support in the present invention should be determined according to the size of the foundation pit and the specific load. According to the shape of the foundation pit, steel support angle braces, steel support opposite braces, and steel support diagonal braces are used. The fastening members of the steel support are Weld the first round steel hook and the second round steel hook with a diameter of 20mm to the steel support and YG2 expansion tube bolts respectively. The first round steel hook and the second round steel hook are bent into a U Type, the length is not less than 50mm, YG2 expansion tube bolts are buried 800mm above the purlin, the round steel hook and YG2 expansion tube bolts are connected by round steel S-shaped connectors with a diameter of 20mm and fastening screws, and the steel support is oblique When supporting, the shear block is welded between the steel support and the purlin, and the size and material of the shear block meet the specific engineering requirements.

Compared with the prior art, the present invention combines the occlusal pile and the ground connection wall, makes full use of the advantages of the two, and overcomes the shortcomings of the two, has good waterproof effect, flexible construction, strong anti-seepage ability, and has a wide range of applications Prospects and good economic effects.

Description of the drawings:

Fig. 1 is a plan view of the connection between the occlusal pile and the underground diaphragm wall according to the present invention.

Fig. 2 is a plan view of the inner wall of the occlusal pile according to the present invention.

Fig. 3 is an internal support elevation view of the combined support structure of the occlusal pile and the underground diaphragm wall according to the present invention.

Fig. 4 is a plan view of the first reinforced concrete support of the occlusal pile and the underground diaphragm wall according to the present invention.

Fig. 5 is a plan view of the occlusal pile and the second and third double reinforcement bars of the underground diaphragm wall according to the present invention.

Fig. 6 is an elevational view of the connection between the double steel support, the purlin and the wall according to the present invention.

Fig. 7 is a plan view of the connection between the double steel support, the purlin and the wall according to the present invention.

Fig. 8 is an elevational view of the connection between the double steel diagonal bracing, the purlin and the wall according to the present invention.

Fig. 9 is a plan view of the connection between the double steel diagonal brace, the purlin and the wall according to the present invention.

Fig. 10 is a detailed view of the embedded anti-slip part of the present invention.

Detailed ways:

The present invention will be described in further detail below through specific examples and in conjunction with the accompanying drawings. However, it should not be understood that the scope of the above-mentioned themes of the present invention is limited to the following examples, and all technologies realized based on the contents of the present invention belong to the scope of the present invention.

Example 1:

The main structure of the combined support structure of the occlusal pile and the ground wall in this embodiment includes the ground wall 1, the occlusal pile plain pile 2, the crown beam 3, the reinforced concrete support 4, the steel support 5, the outer wall structure 6, and the surrounding purlin. 7 and the occlusal pile 8; according to different engineering geological conditions and technical requirements, the ground connection wall 1 or the occlusal pile is selected as the main support structure, and the occlusal pile 2 and the occlusal pile 8 are occluded to form an occlusal pile body; At the joint between the ground connection wall 1 and the occlusal pile, the occlusal pile adjacent to the ground connection wall 1 is the occlusal pile plain pile 2, and the two are occluded and connected; the occlusal pile is connected with the outer wall structure 6 to form a flat wall surface; The crown beam 3 is poured on the wall 1 and the upper part of the occlusal pile respectively; the first support is a reinforced concrete support 4, which is connected with the reserved steel bars on the crown beam 3, and reinforced concrete corner braces and reinforced concrete pairs are used according to the shape and force characteristics of the foundation pit. Braces, reinforced concrete diagonal braces; the purlins 7 are installed on the ground connection wall 1 and the outer wall structure 6 according to the design elevation; the second and third supports are steel supports 5 with a double structure, and the steel supports 5 are connected with the purlins 7. According to the shape and stress characteristics of the foundation pit, use steel support angle braces, steel support counter braces, steel support diagonal braces and take reinforcement measures.

The specific size of the underground diaphragm wall 1 described in this embodiment is determined according to the specific project and the size of the occlusal pile. Generally, the width of the underground diaphragm wall is not more than 6m, the buried depth is 10m to 50m, and the thickness is 0.5m to 1.2m, which is less than the adjacent wall. The diameter of the plain pile 2 of the occlusal pile is at least 200mm, which is convenient for the two to occlude tightly; the diameter and depth of the occlusal pile 2 should be determined according to the specific project, and the diameter should not be less than 1000mm. The interocclusion of the interlocking pile is not less than 300mm; the diameter and buried depth of the interlocking piles and piles 8 are determined according to the specific project, the diameter is not less than 1000mm, and at least C45 underwater concrete is poured, and the interocclusion between the adjacent piles is not less than 300mm; the crown beam 3 The dimensions are 1200×1000mm, 1500×1000mm, at least poured with C45 concrete; the type, length, and cross-sectional area of the reinforced concrete support 4 are determined to be 800×1000mm according to the size of the foundation pit and the specific load, and poured with at least C45 concrete.

The exterior wall structure 6 described in this embodiment includes a net shotcrete layer 9, a mortar leveling layer 10, a construction waterproof layer 11, and a side wall 12, and the net shotcrete layer 9 is formed by hanging the net shotcrete on the anchoring steel bar 13 inside the occlusal pile, and the thickness Not less than 80mm, the outside of the sprayed concrete layer 9 is a mortar leveling layer 10 with a thickness of not less than 20mm, and a waterproof layer 11 is constructed outside the mortar leveling layer 10, and a side wall 12 is poured outside the waterproof layer 11, and the thickness is not less than 20mm.

The purlin 7 in this embodiment adopts combined double I-beams, usually Q235B steel, and the purlin 7 is erected on the triangular support 23, and the triangular support 23 is connected to the ground connection wall 1 by YG2 expansion tube bolts 19 with a diameter of 20mm. , the connection length is not less than 280mm, anti-slip parts 24 are pre-embedded in the inner wall of the purlin 7 provided with diagonal braces to enhance the anti-slip ability of the purlin 7, and the anti-slip parts 24 are welded by steel plates 29 and steel bars 30, The thickness of the steel plate 29 is not less than 20 mm, and the steel bar 30 is a ribbed steel bar with a diameter of not less than 20 mm.

The length, diameter, and wall thickness of the steel support 5 described in this embodiment should be determined according to the size of the foundation pit and the specific load. The solid component is to weld the first round steel hook 21 and the second round steel hook 22 with a diameter of 20mm to the steel support 5 and the YG2 expansion tube bolt 18 respectively, and the first round steel hook 21 and the second round steel hook 22 are all bent into a U-shape by smooth round steel bars, and the length is not less than 50mm. YG2 expansion tube bolts 18 are buried 800mm above the purlin 7, and a circle with a diameter of 20mm is used between the round steel hooks 21, 22 and YG2 expansion tube bolts 18. Steel S-shaped connectors 26, 27 are connected with fastening screws 28. When the steel support 5 is a diagonal brace, a shear block 25 is welded between the steel support 5 and the purlin 7. The size and material of the shear block 25 conform to the specific project Require.

Example 2:

In this embodiment, the support structure described in Example 1 is used in the combined support of the occlusal pile and the underground diaphragm wall in a certain subway station. The main structure of the joint support of the occlusal pile and the ground connection wall includes an underground diaphragm wall 1 with a wall thickness of 800 mm. , with a width of 6.0m and a buried depth of 26m. It is poured with C45 underwater concrete. The ground connection wall 1 is connected by H-shaped steel. Slow-setting concrete pouring; occlusal pile concrete pile 8, diameter 1000mm, occlusal with adjacent piles 300mm, buried depth 26m, using C45 underwater concrete pouring; crown beam 3, crown beam 3 of ground connection wall 1 with a size of 1200×1000mm, occlusal The size of the crown beam 3 of the pile is 1500×1000mm; the concrete support 4, the concrete support is used as the first support, the size is 800×1000mm, and it is made of C45 concrete; the steel support 5 adopts double steel support, and the double steel support adopts Φ609mm, wall thickness t=16mm steel pipe; purlin 7 is made of double I56c combined I-beam, and the steel material is Q235B steel.

The concrete implementation method of this embodiment is:

Step 1: Use Φ1000@700mm casing occlusal piles. When constructing occlusal piles, the occlusal piles adjacent to the ground connection wall 1 are plain piles 2. After setting the line and positioning, the drilling rig is in place, and soil is taken to form holes until the designed holes Bottom elevation, if it is an occlusal pile, the steel cage shall be hoisted after the hole-forming inspection is qualified, and then the concrete shall be poured and the pipe shall be pulled out to form a pile;

Step 2: According to the design requirements and the guide wall, determine the position of ground connection wall 1, and excavate the groove machine. In this embodiment, XCMG 480 hydraulic grab groove machine is used to form grooves. When forming grooves, mud protection walls are used until the depth is equal to Adjacent occlusal piles have the same burial depth, and then the slot hole acceptance is carried out;

Step 3: Carry out the construction of the joint between the ground connection wall 1 and the occlusal pile plain pile 2. When the ground connection wall 1 forms a groove, the side close to the occlusal pile plain pile 2 is expanded into a groove wall with a width of 200 mm to ensure pouring When concrete is used, the concrete can flow around the back of the channel steel; use a rotary drill to drill out some of the seam piles 2, so that the ground wall 1 and the adjacent seam pile 2 are occluded by 300mm, and the seam pile 2 is occluded. After painting the walls, hang the reinforcement cage and pour concrete;

Step 4: Carry out crown beam 3 construction on the top of the occlusal pile 2 and the top of the ground connection wall 1, first position and set out the wires, then tie the steel bars, then support the formwork, pour concrete to form a reinforced concrete crown beam 3, and reserve The steel bars connected by the concrete support 4 and the crown beam 3 at the connection between the ground connection wall 1 and the occlusal pile plain pile 2 should be poured into one;

Step 5: During the construction of the crown beam 3, construct the first reinforced concrete support 4, apply the cushion layer, weld, bind, install the steel bars, install and reinforce the formwork, pour concrete, and maintain the concrete after the formwork is removed until the support strength reaches 75%, continue to dig down, use 2000mm×2000mm×300mm concrete slab braces at the corners of the foundation pit, and use reinforced concrete opposite braces and reinforced concrete diagonal braces for the rest;

Step 6: Use anchoring steel bars 13 to hang the sprayed concrete on the construction site of the occlusal pile to form a sprayed concrete layer 9 with a thickness of 100 mm, and then make a mortar leveling layer 10 on the sprayed concrete layer 9 with a thickness of 20 mm, and then place it on the leveling layer 10 Make the waterproof layer 11, and finally spray the concrete layer 12 with a thickness of 100mm to form the side wall 6;

Step 7: Install the purlin 7 according to the design elevation, install the triangular bracket 23 on the purlin 7, fasten the triangular bracket 23 with two YG2 expansion tube bolts 19 with a diameter of 20mm, and the gap between the purlin 7 and the side wall 12 Fill with C30 fine stone concrete; hoist the steel purlin 7 close to the wall, and then install YG2 expansion tube bolts 18, and the steel purlin 7 at the diagonal brace should embed anti-slip parts 24;

Step 8: The overall splicing and hoisting of the steel support 5 is installed by a 10t gantry crane. After the steel support 5 is installed in place, two 100t hydraulic jacks are used for each support to apply axial force in pre-graded and graded at the movable end of the steel pipe support, and lock it. After the wedge-shaped block 25 is set, the jack is removed to complete the installation of the steel support 5; at the corner of the foundation pit, a double-piece I56c steel corner brace is used, and the rest are double-piece steel support braces and double-piece steel support diagonal braces.

Step 9: After continuing the excavation, brace first and then dig, erect the third steel support 5 in time, measure and position, anchor the triangular support 23, install purlin 7 and steel support 5, apply prestress, add wedge blocks, dismantle Lower the jack to complete the installation of the steel support.

Claims (6)

1. a kind of interlocking pile combines foundation pit supporting method with ground-connecting-wall, it is characterised in that pass through interlocking pile and ground-connecting-wall combined supporting Structure realization, detailed process are as follows:

Step 1: carry out the construction of interlocking pile, pay attention to the interlocking pile adjacent with ground-connecting-wall for plain stake, in order to ground-connecting-wall with it is adjacent Interlocking pile element stake occlusion, after unwrapping wire positioning, drilling machine is in place, and for soil taking hole forming until design bottom hole absolute altitude, meat or fish stake should be in pore-forming inspection Steel reinforcement cage, after-pouring concrete tube drawing pile are hung after qualification.

Step 2: carrying out the construction of ground-connecting-wall, the unwrapping wire of ground-connecting-wall positions construction of guide wall, prepares mud, after grooving, hang reinforcing bar Cage casting concrete forms ground-connecting-wall；

Step 3: the construction of ground-connecting-wall and interlocking pile seam crossing is carried out, when ground-connecting-wall grooving, close to the use of interlocking pile element stake side Churning driven expands grooving width of wall body at least 200mm, it is ensured that when casting concrete, concrete can be around flowing through the channel steel back side；Using Churning driven is bored except interlocking pile element stake at Partial seams, is engaged ground-connecting-wall with adjacent interlocking pile element stake at least 300mm, to occlusion After the plain stake brush wall of stake, steel reinforcement cage, casting concrete are hung；

Step 4: carrying out crown beam construction, first line setting, then assembling reinforcement in interlocking pile element stake top and ground-connecting-wall wall top, then Support template, casting concrete form armored concrete crown beam, and the reserved reinforcing bar with armored concrete support connection, ground-connecting-wall with The crown beam of interlocking pile element stake connecting place should pour integrally；

Step 5: in crown beam construction, first of reinforced concrete support of constructing applies bed course, reinforcement welding, binding, installation, Template installation and reinforcing, casting concrete, curing concrete after demoulding when intensity to be supported reaches 75%, continue to cut the earth downwards；

Step 6: carrying out piling wall and combine construction, construction part uses anchor bar m esh-hanging sprayed concrete to form net in interlocking pile Pneumatically placed concrete layer, thickness is not less than 100mm, then mortar levelling layer is done on in-network processing layer, and thickness is not less than 20mm, then Waterproof layer is done on screed-coat, last shotcrete layer forms side wall；

Step 7: purlin being installed by designed elevation, triangular supports are installed in purlin, with the YG2 type tube expansion of two diameter 20mm Bolt fastening triangular supports, the gap between purlin and side wall are filled with C30 pea gravel concreten；It lifts steel purlin and is close to wall Body, then YG2 tube expansion bolt is installed, the steel purlin at diagonal brace answers pre-buried antiskid part；

Step 8: bracing members integrally splice lifting to be installed using 10t gantry crane, and after bracing members installation is in place, every Pin support is with two 100t platform hydraulic jack withstands on the classification of steel pipe support movable end pre-add and applies axle power, and is locked, and after adding wedge block, removes The installation of jack completion bracing members；

Step 9: continuing first support after excavating and dig afterwards, set up third road bracing members in time；Measurement and positioning anchors triangular supports, Purlin, bracing members are installed, prestressing force is applied, after adding wedge block, removes the installation that jack completes bracing members.

2. interlocking pile combines foundation pit supporting method with ground-connecting-wall according to claim 1, it is characterised in that the interlocking pile and ground are even Wall joint foundation pit supporting construction main structure include ground-connecting-wall, the stake of interlocking pile element, crown beam, reinforced concrete support, bracing members, External wall structure, purlin and Yao He Zhuan Quan；According to different engineering geological conditions, technical requirements, ground-connecting-wall or interlocking pile are selected As main body supporting construction, the stake of interlocking pile element is engaged formation occlusion pile body with conjunction stake Quan is stung；In ground-connecting-wall and interlocking pile seam Place, the interlocking pile adjacent with ground-connecting-wall are the stake of interlocking pile element, and the two occlusion is connected；Interlocking pile is connected with external wall structure, is formed flat Whole metope；Crown beam is poured respectively in ground-connecting-wall and interlocking pile top；First of support is on reinforced concrete support, with crown beam Reserved steel bar is connected, according to foundation pit shape and loading characteristic using armored concrete angle brace, armored concrete to support, reinforced concrete Native diagonal brace；Purlin is installed by designed elevation on ground-connecting-wall and external wall structure；The support of second and third road is the steel branch of Two bors d's oeuveres structure Support, bracing members are connected with purlin, oblique to support, bracing members using bracing members angle brace, bracing members according to foundation pit shape and loading characteristic It supports and takes reinforcement measure.

3. interlocking pile combines foundation pit supporting method with ground-connecting-wall according to claim 2, it is characterised in that the underground is continuous The specific size of wall according to the size of concrete engineering and interlocking pile determine, diaphram wall breadth be not more than 6m, buried depth be 10m extremely 50m is less than adjacent interlocking pile element stake diameter at least 200mm with a thickness of 0.5m to 1.2m, close convenient for the two occlusion；Interlocking pile The diameter and buried depth of plain stake should determine that diameter is not less than 1000mm according to concrete engineering, at least be poured with C25 ultra-retardation concrete It builds, is engaged between adjacent studs stake not less than 300mm；The diameter and buried depth of Yao He Zhuan Quan determines that diameter is not according to concrete engineering Less than 1000mm, at least with the underwater coagulation concreting of C45, it is engaged between adjacent studs stake not less than 300mm；The size of crown beam For 1200 × 1000mm, 1500 × 1000mm, C45 concreting is at least used；The type of reinforced concrete support, length, cross Sectional area is determined as 800 × 1000mm according to foundation pit size and specific load, at least uses C45 concreting.

4. interlocking pile combines foundation pit supporting method with ground-connecting-wall according to claim 2, it is characterised in that the external wall structure Including in-network processing layer, mortar levelling layer, construction waterproof layer, side wall, linked network injection is mixed on anchor bar on the inside of the interlocking pile Solidifying soil forms in-network processing layer, and thickness is not less than 80mm, and the outside of in-network processing layer is the mortar that thickness is not less than 20mm Screed-coat, construction waterproof layer on the outside of mortar levelling layer pour side wall on the outside of waterproof layer, and thickness is not less than 20mm.

5. interlocking pile combines foundation pit supporting method with ground-connecting-wall according to claim 2, it is characterised in that the purlin uses Two bors d's oeuveres I-steel is combined, Q235B steel is generally used, purlin is erected in triangular supports, and triangular supports use diameter 20mm YG2 type tube expansion bolt be connected with ground-connecting-wall, connection length is not less than 280mm, pre- in the purlin inside wall body of setting diagonal brace Non-slip material is buried, for enhancing the resistant slide ability of purlin, Non-slip material is formed by steel plate and reinforcement welding, and the thickness of steel plate is not less than 20mm, reinforcing bar are Ribbed Bar, and diameter is not less than 20mm.

6. interlocking pile combines foundation pit supporting method with ground-connecting-wall according to claim 2, it is characterised in that the bracing members Length, diameter, wall thickness should be determined according to foundation pit size and specific load, use bracing members angle brace, bracing members according to foundation pit shape To support, bracing members diagonal brace, the fastening members of bracing members be by the first round steel suspension hook of diameter 20mm, the second round steel suspension hook respectively with It is welded between bracing members, YG2 tube expansion bolt, the first round steel suspension hook, the second round steel suspension hook are bent to U-shaped, length by plain bar Not less than 50mm, YG2 tube expansion bolt is embedded in above purlin at 800mm, uses diameter between round steel suspension hook and YG2 tube expansion bolt The round steel S type connector of 20mm is connected with fastening screw, and when bracing members are diagonal brace, shearing is welded between bracing members and purlin Block, shears the size of block and material meets concrete engineering requirement.