CN108118689B - Partially recyclable prefabricated underground diaphragm wall, spreader and construction method - Google Patents

Abstract

The invention discloses a prefabricated underground diaphragm wall capable of being partially recycled, a lifting appliance and a construction method, wherein the diaphragm wall comprises a concrete cushion layer, an arch slab beam base and an assembled diaphragm wall which are sequentially arranged from bottom to top; the assembled continuous wall is formed by assembling a plurality of arch plate beam members, through long round steel and rubber steel plate bases; the arch plate beam members have different length types, the long arch plate beam members and the short arch plate beam members are transversely and longitudinally staggered, and the upper arch plate beam member and the lower arch plate beam member in the excavation depth are connected through arc segment bolts. The invention utilizes the structure assembled by arched beam members to form the continuous wall, and has the advantages of tight connection, good overall performance and easy control of wall deformation; the continuous wall part can be lifted out according to specific conditions and recycled, so that the resources are saved, and the method is economical and environment-friendly.

Description

Partially recyclable prefabricated underground diaphragm wall, spreader and construction method

technical field

The invention relates to an underground building construction device and a construction method, in particular to a partially recyclable prefabricated underground continuous wall, a spreader and a construction method.

Background technique

The underground diaphragm wall is a kind of excavation construction process. Its construction method is to excavate a narrow and long deep groove along the periphery of the deep excavation project with the excavation equipment under the condition of mud retaining wall, and pour into the groove after cleaning the groove Appropriate materials are used to form a wall, and then several sections of the wall are connected into a whole, that is, a continuous underground wall, which is used as a water interception, seepage prevention, load bearing, and water retaining structure. The specific construction process is shown in Figure 1. The construction of this kind of diaphragm wall has the following characteristics: small working vibration, low noise, especially suitable for urban rail construction, and can be constructed at night; using reinforced concrete or plain concrete, the wall has strong rigidity, strength and overall stability, and can be used Reduce the deformation and settlement of structures and foundations; it can adapt to various excavated strata, except for lava geology, and can be safely constructed near weak strata and important buildings; especially the construction near or close to underground pipelines, settlement and displacement changes Relatively easy to control; using bentonite mud wall construction, mainly used to seal and protect the tank wall, can be constructed safely and reliably, and the surrounding foundation and foundation will not produce excessive settlement.

However, the defects of this traditional cast-in-place monolithic underground diaphragm wall are also relatively prominent, mainly in the following aspects: 1. The construction process of the underground diaphragm wall is complicated, the construction period is long, and the cost is very expensive; 2. The underground diaphragm wall is used as a temporary retaining soil 1. The anti-seepage wall cannot be recycled when used, resulting in unnecessary waste; 3. The quality of the joints at the joints of the underground continuous wall is difficult to control, which is a weak link in the construction; and the wall is inclined, and the surface is bulged and exposed Problems such as ribs and leakage need further processing, which not only wastes costs, but also has a great impact on the construction of the main structure in the later stage; 5. Construction technology, selection of groove forming machines, underground groove construction, joint treatment, pouring concrete, mud Every link such as treatment needs to be properly handled, and no omissions can be left, otherwise it will have a serious impact on the quality of the wall; 6. During construction, the groundwater level rises rapidly, and the liquid level of the retaining mud drops rapidly. If the nature of the mud is problematic or deteriorated, Coupled with improper construction management, or the existence of weak and loose sandy interlayers, the tank wall is prone to collapse, ranging from overcubic concrete walls and out-of-bounds structural dimensions, to serious ground subsidence or even collapse, causing damage to adjacent buildings and underground pipelines 7. It is difficult to arrange detection devices for accurate detection of the soil layer on the facing soil surface, and the existing detection methods such as road surface settlement and deformation are relatively lagging behind.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a partially recyclable prefabricated underground diaphragm wall, spreader and construction method, so that the integrity of the diaphragm wall is good, the deformation of the wall is easy to control, and the phenomenon of concrete bypass is not easy to occur, and it also avoids It eliminates the convex belly phenomenon of reinforced concrete wall panels caused by the soil collapse in the groove. At the same time, it has low requirements for mud, small amount of concrete work on site, short construction period, simple construction process, and can be used repeatedly, reducing costs and saving resources.

The present invention is a partially recyclable prefabricated underground continuous wall, which includes concrete cushion, arched plate beam base and assembled continuous wall arranged in sequence from bottom to top; wherein the assembled continuous wall is composed of several arched plate beam members, long round steel and rubber Assembled steel plate base;

The arched plate beam member includes an arched plate, a left vertical beam and a right vertical beam. The upper end surface of the vertical beam, the lower end surface of the arched plate is recessed into the lower end surface of the left vertical beam and the right vertical beam, the cross section of the left vertical beam is concave, the cross section of the right vertical beam is convex, and the groove of the left vertical beam Cooperate with the protrusion size of the right vertical beam, and match the protrusion height of the upper end of the arched plate with the recessed depth of the lower end of the arched plate. Both the left vertical beam and the right vertical beam are symmetrically opened with two thin holes that allow the long round steel to pass through. The wall steel pipe through hole; the rubber steel plate base includes a convex base and a concave base, the surface size of the concave base is consistent with the cross-sectional size of the left vertical beam, the surface size of the convex base is consistent with the cross-sectional size of the right vertical beam, The steel plate base is made of a number of thick steel plates and thick rubber pads that are superimposed and adhered alternately. The concave and convex bases are symmetrically opened with two through holes that allow the long round steel to pass through, and the concave and convex bases A number of bolt holes are evenly distributed on the top, and the thick steel plates and thick rubber pads interlaced on the rubber steel plate base are fastened together with high-strength bolts passing through the bolt holes after a certain pre-tightening force is applied. The large heads of the high-strength bolts are welded with L Shaped steel bar, the other end of the L-shaped steel bar is anchored into the bottom of the left vertical beam and the right vertical beam when the arched plate beam is made, and the lower ends are guaranteed to be flush;

The arched plate beam members have different length models, the long arched plate beam members and the short arched plate beam members are arranged staggered horizontally and vertically, and the upper and lower arched plate beam members within the excavation depth are connected by arc segment bolts;

The base of the arched beam is assembled from rectangular reinforced concrete structures with different lengths. The first layer of the arched beam set on the base of the arched beam is integrally poured with the base of the arched beam and the round steel is pre-anchored into the base of the arched beam. Among them, eight round steels are anchored on the base of the long arch beam, four of which are used to connect the arch beam members set on this base, and the other four round steels are respectively used to connect the adjacent bases on both sides. As for the arched plate beam member, four round steels are anchored on the base of the short arched plate beam, two of which pass through the thin-walled steel pipe holes on one side of the arched plate beam member set on the base, and the other two round steels are set on the The arch plate beam members are on the same side and are used to connect the arch plate beam members arranged on adjacent bases.

Due to its arched structure, the arched plate of the arched plate beam will produce a certain amount of back tension on the left vertical beam and the right vertical beam on both sides, and the weight of the component itself strengthens the tightness and stability of the overall wall connection; The arched plate beam members are arranged alternately by long arched plate beam members and short arched plate beam members to form a continuous wall to improve the shear resistance of the continuous wall; Components, which can ensure the overall installation accuracy of the assembled continuous wall and improve the overall strength and stability; the base of the arch plate beam is spliced by reinforced concrete blocks of different lengths, and pre-anchored into round steel, so that the left and right adjacent arch plate beam components The connection between them is tighter, which greatly improves the overall strength of the diaphragm wall, and is more suitable for places with settlement requirements; the rubber steel plate base between the upper and lower members is compressed and deformed by applying a certain prestress before the connection, and then tightened with high strength Bolts, which effectively reduce the strain generated after splicing, and the rubber steel plate base can relieve the stress concentration of the connecting parts and allow small deformation, so that the force of the long round steel is more coordinated; the arc-shaped segment bolts can limit the overall components of the continuous wall Deformations that occur during excavation after deformation coordination.

In order to further improve the waterproof performance of the continuous wall, the middle part of the arched plate, the outer middle part of the left vertical beam, and the outer middle part of the right vertical beam are all provided with card slots, and the rubber water-stop sheets are covered in the card slots.

Further, a detection device is installed in the arched plate arch, and the detection device includes a strain gauge and a vibration sensor. The above-mentioned detection device can monitor changes in soil pressure, settlement, deformation and water conservancy on the facing soil surface, so as to achieve advance prediction and effective response.

Further, the long round steel is formed by connecting several round steels, and every two round steels are connected by thread connection or pin insertion. Different round steel connection methods can be selected according to different construction requirements. When the whole round steel needs to be hoisted out and disassembled, the two round steels should be connected by threads; The round steel can adopt the pin shaft insertion type.

Further, before assembling, the upper end of each arch beam member is covered with a rubber protective cover, and a rubber protective cover steel plate is arranged inside the rubber protective cover, and each steel plate has a hoisting ring hole. By putting the rubber protective sleeve on the splicing seam of the arch-slab beam members, it can not only have a certain protective effect during transportation, but also prevent the inclusion of debris such as sediment during the splicing process.

A special spreader that can partially recycle the prefabricated underground continuous wall, including a triangular suspender, a flat suspender and two sets of spreaders. There is a distance between the upper and lower hoisting bolts in the lower hoisting bolt hole of the shaped plate, and the triangular suspender is connected with the upper hoisting bolt through a suspender I, and the suspender I includes a steel strand I and a rope buckle I, and the rope buckle The connection position of I is higher than the ground level; the flat suspender is connected to the lower hoisting bolt through the spreader II. On the rope II, the rope buckle II can be fixed at any position of the steel twisted rope II.

The flat suspender is an ordinary long pole type, and the triangular suspender is an isosceles triangle, and the hanger I is suspended at the long side of the lowermost end of the triangular suspender, and the component can be safely and efficiently completed without damaging the structure through the hoisting bolt. Hoisting; the upper and lower hoisting bolts are staggered by a certain distance, and the stability of the hoisting is ensured by offsetting the force components of the same line and the upper triangular suspender; by reserving the steel strands, the prefabricated underground continuous wall can be placed in the After the construction of the main body is completed, part or all of it is hoisted out according to the specific working conditions, and then recycled.

A construction method that can partially recycle the prefabricated underground diaphragm wall, the steps are as follows:

In the first step, when prefabricating the arched plate beam components, the pipelines are pre-embedded in the arched plate beam, and the detection device is installed at the designated position of the arched plate beam and marked;

The second step is to enter the construction site to form a trench under the protection of the mud retaining wall, dig to a certain depth higher than the design elevation to clear the bottom, and then pour concrete through the conduit to the design bottom elevation as a concrete cushion;

The third step is to hoist the base of the arch slab beam to the design elevation after the initial setting of the concrete, level the concrete on the cushion layer, and then lift it out. After the final setting of the concrete, the base of the arch slab beam and the bottom arch slab beam member are accurately hoisted by hoisting bolts into the groove; at the same time, steel strands are reserved on the hoisting ring hole of the rubber protective sleeve steel plate at the upper end of the arch beam member;

In the fourth step, the round steel is pre-anchored into the base of the arched plate beam, among which eight round steels are symmetrically anchored into the base of the long arched plate beam, four round steels are anchored into one side of the base of the short arched plate beam, and two short arched beams are anchored into the base. The slab girder base is symmetrically arranged on both sides of a long arched slab girder base, and the arched slab girder member is hoisted horizontally to directly above the designated position by two cranes, one of which is connected to the flat boom and the other to the Triangular suspender, then remove the shackle on the lower end spreader II, and use the triangular suspender and spreader I to vertically lower the arch plate beam member to the designated position;

The fifth step is to connect the full-length round steel in sequence according to the design method during the lowering process of the second-floor arch-slab beam members until the top elevation of the full-length round steel is higher than the mud surface;

The sixth step is to hoist the next arched plate beam member according to the hoisting method of the fourth step so that the thin-walled steel pipe holes reserved for the arched plate beam member pass through four long round steel bars. When the arched plate beam member is lowered to the joint When hoisting the rubber protective cover of the last arched plate girder and then splicing it in place sequentially; lifting and splicing are carried out alternately according to the long arched plate girder components and the short arched plate girder components;

The seventh step is to construct on both sides in turn. The upper end of the long round steel is anchored into the upper concrete support, and the overall stability is ensured through the upper and lower connections;

In the eighth step, after the construction of the three underground diaphragm walls, joint boxes are placed on both sides, and then cement slurry is injected under high pressure into the gaps with the soil on both sides, so that the soil on both sides is evenly stressed and the settlement of the underground diaphragm walls is reduced; etc. After the cement slurry reaches a certain strength, construct the underground diaphragm walls on both sides; or place joint boxes on both sides during the construction of the first section, while hoisting the arched plate beam components, while injecting high-pressure cement slurry at a depth lower than the elevation of the arched plate beam components;

The ninth step is to connect the upper and lower arch plate beam members with arc-shaped segment bolts at the joint of the arch plate beam when excavating, and then erect steel supports at the joint joint of the arch plate beam to ensure stability and form a plate beam Column force system;

The tenth step, the construction of the main structure is completed, and after the strength and settlement are stable, the arch plate beam at the corner is removed first, and the steel strands are reserved, and the arch plate beam members other than the arch plate beam members connected to the base of the arch plate beam are removed by means of hoisting bolts. The other arch beam members are hoisted out at one time, and then the round steel is disassembled; cement slurry is injected in time after the demolition of an underground diaphragm wall is completed, and the demolition of the adjacent segment of the underground diaphragm wall is continued after the cement slurry reaches a certain strength.

The cement slurry is made of a certain proportion of water, cement, fly ash, clay, construction waste material powder or sand and admixtures.

The invention solves the problems of the existing cast-in-place underground diaphragm wall, such as high cost, long construction period, difficulty in controlling the construction quality of the underground diaphragm wall, and many hidden dangers of the wall body after excavation. The diaphragm wall is composed of a structure assembled with arched beam members , tight connection, good overall performance, and easy control of wall deformation; the continuous wall can also be hoisted out as a whole according to specific conditions, and then reused repeatedly, saving resources, economical and environmentally friendly; at the same time, it can detect the soil-facing surface more safely, conveniently and accurately Condition.

Description of drawings

Fig. 1 is the flow chart of integral type underground diaphragm wall construction procedure in the prior art;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is a schematic structural view of an arched plate beam member in the present invention;

Fig. 4 is a schematic diagram of a three-dimensional structure of a convex-shaped base in the present invention;

Fig. 5 is a schematic diagram of the three-dimensional structure of the concave-shaped base of the present invention;

Fig. 6 is a schematic diagram of the structure of high-strength bolts in the present invention;

Fig. 7 is the assembling drawing of the arch plate girder member, the long round steel and the rubber steel plate base in the present invention;

Fig. 8 is a schematic structural view of a rubber protective sleeve in the present invention;

Fig. 9 is a schematic structural view of the rubber protective sheath steel plate arranged in Fig. 9;

Fig. 10 is a schematic diagram of a pin shaft inserted round steel structure in the present invention;

Fig. 11 is a schematic diagram of a threaded connection structure in the present invention;

Fig. 12 is a schematic diagram of the structure of a triangular suspender;

Fig. 13 is a structural schematic diagram of spreader 1;

Fig. 14 is a structural schematic diagram of the spreader II;

Fig. 15 is a schematic diagram of hoisting and leveling the base of the arched plate beam;

In the figure: 1. Concrete cushion; 2. Arched plate beam base; 21. Long arched plate beam base; 22. Short arched plate beam base; 3. Assembled continuous wall; 4. Arched plate beam component; 41. Arched plate ; 42, left vertical beam; 43, right vertical beam; 44, upper lifting bolt hole; 45, lower lifting bolt hole; 5, long round steel; 51, round steel; 6, rubber steel plate base; 61, convex font base; 62. Concave base; 63. Bolt holes; 64. High-strength bolts; 65. L-shaped steel bars; 7. Arc segment bolts; Steel plate; 92, hoisting ring hole; 10, triangular suspender; 11, upper hoisting bolt; 12, lower hoisting bolt; 13, spreader I; 13-1, steel strand I; 13-2, rope buckle I; 14 , Spreader II; 14-1, steel strand II; 14-2, shackle; 14-3, rope buckle II.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figures 2 to 7, a prefabricated underground continuous wall that can be partially recycled includes a concrete cushion 1, an arch beam base 2 and an assembled continuous wall 3 that are sequentially arranged from bottom to top; wherein the assembled continuous wall 3 is composed of Several arch beam members 4, long round steel 5 and rubber steel plate base 6 are assembled;

Described arched plate beam member 4 comprises arched plate 41, left vertical beam 42 and right vertical beam 43, and the two ends of arched plate 41 are connected in the middle of left vertical beam 42 and right vertical beam 43 respectively, on the arched plate 41 The end faces protrude from the upper end faces of the left vertical beam 42 and the right vertical beam 43, and the lower end surface of the arched plate 41 is recessed into the lower end faces of the left vertical beam 42 and the right vertical beam 43. The cross section of the left vertical beam 42 is concave, and the right vertical beam The beam 43 cross-section is a convex shape, and the groove of the left vertical beam 42 cooperates with the protrusion size of the right vertical beam 43. Both the beam 42 and the right vertical beam 43 are symmetrically opened with two thin-walled steel pipe through holes that allow the long round steel 5 to pass through; the rubber steel plate base 6 includes a convex base 61 and a concave base 62, and the concave base 62 The surface size is consistent with the cross-sectional size of the left vertical beam 42, and the surface size of the convex base 61 is consistent with the cross-sectional size of the right vertical beam 43. The rubber steel plate base 6 is formed by overlapping and adhering several thick steel plates and thick rubber pads. Both the font-shaped base 62 and the convex-shaped base 61 are symmetrically opened with two through holes that allow the long round steel to pass through, and a number of bolt holes 63 are evenly distributed on the concave-shaped base and the convex-shaped base. Thick steel plates and thick rubber pads are fastened together with high-strength bolts 64 passing through bolt holes 63 after a certain pre-tightening force is applied. The large ends of high-strength bolts 64 are welded with L-shaped steel bars 65, and the other end of L-shaped steel bars 65 Anchor into the bottom of the left vertical beam 42 and the right vertical beam 43 when the arch plate beam member 4 is made, and ensure that the lower end is flush;

The arched plate beam members 4 have different length models, the long arched plate beam members and the short arched plate beam members are arranged alternately in the horizontal and vertical directions, and the upper and lower arched plate beam members within the excavation depth are connected by arc-shaped segment bolts 7 ;

As shown in Fig. 7, the arched plate beam base 2 is assembled from cuboid reinforced concrete structures with different lengths. The steel 51 is pre-anchored into the arch beam base 2, and eight round steels 51 are anchored on the long arch beam base 21, among which four round steels 51 are used to connect the arch beam members 4 set on the base, and the other four The round steels are respectively used to connect the arch beam members 4 set on the adjacent bases on both sides, and four round steels are anchored on the base 22 of the short arch beams, two of which pass through the arch beam members set on the base 4 through the thin-walled steel pipe on one side, and the other two round steels are arranged on the same side of the arched plate beam member and are used to connect the arched plate beam member 4 provided on the adjacent base.

Due to its arched structure, the arched plate 41 of the arched plate beam member will produce a certain amount of back tension on the left vertical beam 42 and the right vertical beam 43 on both sides, and the weight of the component itself strengthens the tightness and tightness of the overall wall connection. Stability; the arched plate beam member 4 is arranged alternately by the long arched plate beam member and the short arched plate beam member to form a continuous wall, which improves the shear resistance of the continuous wall; on the arched plate beam base 2, the long round steel 5 is spliced in advance Install the arch beam member 4 again, which can ensure the overall installation accuracy of the assembled continuous wall 3 and improve the overall strength and stability; , so that the connection between the left and right adjacent arch beam members 4 is tighter, which greatly improves the overall strength of the diaphragm wall, and is more suitable for places with settlement requirements; the rubber steel plate base 6 between the upper and lower arch beam members is in the Before the connection, the high-strength bolts 64 are tightened to produce a certain compression deformation by applying a certain prestress, thereby effectively reducing the strain generated after splicing, and the rubber steel plate base 6 can relieve the stress concentration of the connecting parts and allow small deformations, so that through The stress of the elongated round steel 5 is more coordinated; the arc-shaped segment bolts 7 can limit the deformation produced in the excavation process after the deformation coordination of the overall component of the continuous wall.

As shown in Figure 7, in order to further improve the waterproof performance of the continuous wall, the middle part of the arched plate 41, the middle part of the outer side of the left vertical beam 42, and the outer middle part of the right vertical beam 43 are all provided with card slots, and rubber water-stop sheets are covered in the card slots 8.

Further, a detection device is installed in the arch of the arch plate 41, and the detection device includes a strain gauge, a vibration sensor, a displacement sensor, a liquid level sensor and a temperature sensor.

The above-mentioned detection device can monitor changes in soil pressure, settlement, deformation and water conservancy on the facing soil surface, so as to achieve advance prediction and effective response.

As shown in FIG. 10 and FIG. 11 , the long round steel 5 is formed by connecting several round steels 51 , and every two round steels 51 are connected by thread connection or pin insertion. Different round steel connection methods can be selected according to different construction requirements. When the whole round steel needs to be hoisted out and disassembled, the two round steels should be connected by threads; The round steel can adopt the pin shaft insertion type.

As shown in Fig. 8 and Fig. 9, before assembling, the upper end of each arch beam member 4 is covered with a rubber protective cover 9, and the rubber protective cover 9 is provided with a rubber protective cover steel plate 91, and each steel plate has a hoisting ring hole 92 . By putting the rubber protective sleeve on the splicing seam of the arch-slab beam members, it can not only have a certain protective effect during transportation, but also prevent the inclusion of debris such as sediment during the splicing process.

As shown in Figures 12 to 14, a special spreader that can partially recycle the prefabricated underground diaphragm wall includes a triangular hanger 10, a flat hanger (not shown in the figure) and two sets of hangers, and the upper lifting bolt 11 is installed on In the upper hoisting bolt hole 44 of the arched plate 41, the lower hoisting bolt 12 is installed in the lower hoisting bolt hole 45 of the arched plate 41, there is a section of distance between the upper and lower hoisting bolts, and the triangular suspender 10 passes through the hanger I13 and The upper hoisting bolt 11 is connected, and the sling I13 includes a steel strand I13-1 and a rope buckle I13-2, and the connection position of the rope buckle I13-2 is higher than the ground level; connected, the spreader II14 includes a steel strand rope II14-1, a shackle 14-2 and a rope buckle II14-3, the shackle 14-2 connects the lower lifting bolt 12 to the steel strand rope II14-1, and the rope buckle II14 -3 can be fixed at any position of the strand rope II14-1.

The flat suspender is an ordinary long pole type, the triangular suspender is an isosceles triangle, and the hanger I13 is hung on the long side of the lowermost end of the triangular suspender, and the component can be safely and efficiently completed without damaging the structure through the hoisting bolt. Hoisting; the upper and lower hoisting bolts are staggered by a certain distance, and the stability of the hoisting is ensured by offsetting the force components of the same line and the upper triangular suspender; by reserving the steel strands, the prefabricated underground continuous wall can be placed in the After the construction of the main body is completed, part or all of it is hoisted out according to the specific working conditions, and then recycled.

As shown in Figures 2 to 15, a construction method that can partially recycle the prefabricated underground diaphragm wall, the steps are as follows:

In the first step, when prefabricating the arched plate beam member 4, the pipeline is pre-embedded in the arched plate beam, and the detection device is installed on the designated position of the arched plate beam and marked;

The second step is to enter the construction site and form a trench under the protection of the mud retaining wall, dig to a certain depth higher than the design level to clear the bottom, and then pour concrete through the conduit to the design bottom level as the concrete cushion 1;

The third step is to hoist the base of the arch slab beam to the design elevation after the initial setting of the concrete, level the concrete on the cushion layer, and then hoist it out. 4 Precise hoisting into the groove; meanwhile, a steel strand is reserved on the hoisting ring hole 92 of the rubber protective sheath steel plate 91 at the upper end of the arch beam member 4;

In the fourth step, the round steel 51 is pre-anchored into the base 2 of the arched plate beam, wherein eight round steels 51 are symmetrically anchored into the base 21 of the long arched plate beam, and four round steels are anchored into one side of the base 22 of the short arched plate beam Two short arched beam bases 22 are symmetrically arranged on both sides of a long arched beam base 22 respectively, and the arched beam member 4 is hoisted horizontally to directly above the designated position by two cranes, and one of the cranes is connected to the horizontal Suspender, another crane connects the triangular suspender, then disassembles the shackle 14-2 on the lower end suspender II14, and utilizes the triangular suspender 10 and the suspender I13 to vertically lower the arch plate beam member 4 to a designated position;

In the fifth step, during the lowering process of the arched plate beam member 4 on the second floor, the full-length round steel bars 5 are sequentially connected together according to the design method until the top elevation of the full-length round steel bars is higher than the mud surface;

The sixth step is to hoist the next arched plate beam member 4 according to the hoisting method of the fourth step so that the thin-walled steel pipe through holes reserved by the arched plate beam member 4 pass through four long round steel bars 5. When the arched plate beam member 4 is lowered to the At the splicing seam, first lift the rubber protective cover 9 of the last arched plate beam and then splice it in place sequentially; the lifting and splicing are carried out alternately according to the long arched plate beam member and the short arched plate beam member;

The seventh step is to construct on both sides in turn. The upper end of the long round steel 5 is anchored into the upper concrete support, and the overall stability is ensured through the upper and lower connections;

In the eighth step, after the construction of the three underground diaphragm walls, joint boxes are placed on both sides, and then cement slurry is injected under high pressure into the gaps with the soil on both sides, so that the soil on both sides is evenly stressed and the settlement of the underground diaphragm walls is reduced; etc. After the cement slurry reaches a certain strength, construct the underground diaphragm walls on both sides; or place joint boxes on both sides during the first construction, and while hoisting the arch beam member 4, inject cement at a depth lower than the elevation of the arch beam member 4 under high pressure. slurry;

The ninth step is to connect the upper and lower arch plate beam members with arc segment bolts 7 when excavating to the joint of the arch plate beam, and then erect steel supports at the joint joint of the arch plate beam to ensure stability and form a slab Beam-column stress system;

The tenth step, the construction of the main structure is completed, and after the strength and settlement are stable, the arch plate beam at the corner is removed first, and the steel strands are reserved, and the arch plate beam members other than the arch plate beam members connected to the base of the arch plate beam are removed by means of hoisting bolts. The other arch beam members are hoisted out at one time, and then the round steel is disassembled; cement slurry is injected in time after the demolition of an underground diaphragm wall is completed, and the demolition of the adjacent segment of the underground diaphragm wall is continued after the cement slurry reaches a certain strength.

The cement slurry is made of a certain proportion of water, cement, fly ash, clay, construction waste material powder or sand, and admixtures.

Claims (8)

1. A partially recyclable prefabricated underground continuous wall is characterized in that it comprises a concrete cushion (1), an arch beam base (2) and an assembled continuous wall (3) arranged sequentially from bottom to top; wherein the assembled continuous wall (3) It is assembled from several arched plate beam members (4), long round steel (5) and rubber steel plate base (6); Described arch plate beam member (4) comprises arch plate (41), left vertical beam (42) and right vertical beam (43), and the two ends of arched plate (41) are respectively connected on left vertical beam (42) and right vertical beam (43). In the middle of the right vertical beam (43), the upper end surface of the arched plate (41) protrudes from the upper end surface of the left vertical beam (42) and the right vertical beam (43), and the lower end surface of the arched plate (41) is recessed into the left vertical beam (42) and the lower end surface of the right vertical beam (43), the left vertical beam (42) cross section is a concave shape, the right vertical beam (43) cross section is a convex shape, and the groove of the left vertical beam (42) is in line with the right The protruding dimensions of the vertical beams (43) cooperate with each other, and the convex height of the upper end of the arched plate (41) cooperates with the recessed depth of the lower end of the arched plate (41), and the left vertical beam (42) and the right vertical beam (43) Both are symmetrically provided with two thin-walled steel pipe through holes that allow long round steel (5) to pass through; the rubber steel plate base (6) includes a convex-shaped base (61) and a concave-shaped base (62), and the concave-shaped base ( 62) is consistent with the cross-sectional size of the left vertical beam (42), the surface size of the convex base (61) is consistent with the cross-sectional size of the right vertical beam (43), and the rubber steel plate base (6) is made of several thick steel plates and thick The rubber pads are staggered and superimposed and adhered. The concave base (62) and the convex base (61) are symmetrically provided with two through holes that allow the long round steel (5) to pass through, and the concave base and the convex base Some bolt holes (63) are also evenly distributed on the base, and the thick steel plates and thick rubber pads superimposed on the rubber plate base (6) apply a certain pre-tightening force and tighten with high-strength bolts (64) passing through the bolt holes (63). Fixed together, the big head of high-strength bolt (64) is welded with L-shaped steel bar (65), and the other end of L-shaped steel bar (65) is anchored into left vertical beam (42) and The bottom of the right vertical beam (43), and ensure that the lower end is flush; the arched plate beam members (4) have different length models, and the long arched plate beam members and short arched plate beam members are arranged in a staggered horizontal and vertical direction. The upper and lower arch plate beam members are connected by arc-shaped segment bolts (7); The arched plate beam base (2) is assembled from cuboid reinforced concrete structures with different lengths, and the arch plate beam member (4) on the first layer of the arched plate beam base (2) is integrated Pouring and pre-anchoring the round steel (51) into the arched plate beam base (2), anchoring eight round steels (51) on the long arched plate beam base (21), four of which are used for connecting The arch beam member (4) arranged on this base, the other four round steels are respectively used to connect the arch beam members (4) arranged on the adjacent bases on both sides, and the short arch beam base (22) is anchored into four Two round steels pass through the thin-walled steel pipe holes on one side of the arched plate beam member (4) set on the base, and the other two round steels are arranged on the same side of the arched plate beam member and are used to connect adjacent The arch plate beam member (4) arranged on the base. 2. The partially recyclable prefabricated underground continuous wall according to claim 1, characterized in that, the middle part of the arched plate (41), the middle part of the left vertical beam (42) and the middle part of the outer side of the right vertical beam (43) are all open There is a card slot, and the rubber water-stop sheet (8) is covered in the card slot. 3. The partially recyclable prefabricated underground diaphragm wall as claimed in claim 2 is characterized in that a detection device is installed in the arched plate (41) arch, and the detection device includes a strain gauge, a vibration sensor, a displacement sensor, a liquid position sensor and temperature sensor. 4. The partially recyclable prefabricated underground continuous wall as claimed in claim 3, characterized in that the long round steel (5) is formed by connecting several round steels (51), and passes between every two round steels (51). Threaded connection or pin plug-in connection. 5. The partially recyclable prefabricated underground continuous wall according to any one of claims 1 to 4, characterized in that, before assembly, the upper end of each arch beam member (4) is covered with a rubber protective sleeve (9 ), the rubber protective cover (9) is provided with a rubber protective cover steel plate (91), and each steel plate has a hoisting ring hole (92). 6. A special spreader for partially recyclable prefabricated underground diaphragm walls as claimed in any one of claims 1-5, characterized in that it comprises a triangular hanger (10), a flat hanger and two groups of hangers, The upper lifting bolt (11) is installed in the upper lifting bolt hole (44) of the arched plate (41), and the lower lifting bolt (12) is installed in the lower lifting bolt hole (45) of the arched plate (41). There is a certain distance between the lower lifting bolts, and the triangular suspender (10) is connected with the upper lifting bolt (11) by a suspender I (13), and the suspender I (13) includes a steel strand I (13-1) and The rope buckle I (13-2), the connection position of the rope buckle I (13-2) is higher than the ground level; the flat suspender is connected with the lower hoisting bolt (12) by the suspender II (14), and the suspender II ( 14) Including steel strand rope II (14-1), shackle (14-2) and rope buckle II (14-3), shackle (14-2) connects the lower lifting bolt (12) to the steel strand rope II (14-1), rope buckle II (14-3) can be fixed at any position of steel strand rope II (14-1). 7. A construction method for partially recyclable prefabricated underground diaphragm walls as claimed in any one of claims 1-5, using the special spreader as claimed in claim 6, wherein the steps are as follows: In the first step, when prefabricating the arched plate beam member (4), the pipeline is pre-embedded in the arched plate beam, and the detection device is installed on the designated position of the arched plate beam and marked; The second step is to enter the construction site and form a trench under the protection of the mud retaining wall, dig to a position deeper than the design level to clear the bottom, and then pour concrete through the conduit to the design bottom level as a concrete cushion (1); The third step is to lift the base of the arch plate beam (2) to the design elevation after the initial setting of the concrete, level the concrete on the cushion layer, and then lift it out. The arched plate beam member (4) is accurately hoisted into the groove; at the same time, a steel strand is reserved on the hoisting ring hole (92) of the rubber protective sleeve steel plate (91) at the upper end of the arched plate beam member (4); In the fourth step, the round steel (51) is pre-anchored into the arched plate beam base (2), wherein the long arched plate beam base (21) is symmetrically anchored into eight round steels (51), and the short arched plate beam base (22 ), one side of which is anchored into four round steels, two short arched plate beam bases (22) are symmetrically arranged on both sides of a long arched plate beam base (22), and the arched plate beam member (4 ) to lift horizontally to directly above the designated position, one of the cranes is connected to the flat boom, and the other crane is connected to the triangular boom, and then the shackle (14-2) on the lower end spreader II (14) is removed, and the triangular boom is used to Rod (10) and hanger 1 (13) vertically lower the arch plate beam member (4) to the designated position; In the fifth step, during the lowering process of the arched plate beam member (4) on the second floor, the full-length round steel (5) is sequentially connected together according to the design method, until the elevation of the top of the full-length round steel is higher than the mud surface; The sixth step is to hoist the next arched plate beam member (4) according to the hoisting method of the fourth step so that the thin-walled steel pipe through holes reserved by the arched plate beam member (4) pass through four long round steel bars (5), and when the arched plate When the beam member (4) is lowered close to the splicing seam, the rubber protective cover (9) of the upper arched plate beam (9) is lifted first, and then spliced in place sequentially; the hoisting splicing is performed alternately according to the long arched plate beam member and the short arched plate beam member conduct; The seventh step is to construct on both sides in turn, the upper end of the long round steel (5) is anchored into the upper concrete support, and the overall stability is ensured through the upper and lower connections; In the eighth step, after the construction of the three underground diaphragm walls, joint boxes are placed on both sides, and then cement slurry is injected under high pressure into the gaps with the soil on both sides, so that the soil on both sides is evenly stressed and the settlement of the underground diaphragm walls is reduced; etc. The underground diaphragm walls on both sides shall be constructed after the cement slurry reaches a certain strength; or joint boxes shall be placed on both sides during the first construction, and the arched plate beam member (4) shall be hoisted while the high-pressure injection is lower than the elevation of the arched plate beam member (4). depth of cement slurry; In the ninth step, when excavating to the joint of the arch-slab beam, use arc-shaped segment bolts (7) to connect the upper and lower two arch-slab beam members, and then erect steel supports at the joint of the arch-slab beam to ensure stability. Composition of plate-beam-column stress system; The tenth step, the construction of the main structure is completed, and after the strength and settlement are stable, the arch plate beam at the corner is removed first, and the steel strands are reserved, and the arch plate beam members other than the arch plate beam members connected to the base of the arch plate beam are removed by means of hoisting bolts. The other arch beam members are hoisted out at one time, and then the round steel is disassembled; cement slurry is injected in time after the demolition of an underground diaphragm wall is completed, and the demolition of the adjacent segment of the underground diaphragm wall is continued after the cement slurry reaches a certain strength. 8. The construction method of partially recyclable prefabricated underground diaphragm wall as claimed in claim 7, wherein the cement slurry adopts a certain proportion of water, cement, water glass, fly ash, clay, construction waste material powder or sand and Additives are made.

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