CN109537599B - Construction method of support replacing structure of deep foundation pit support system - Google Patents
Construction method of support replacing structure of deep foundation pit support system Download PDFInfo
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- CN109537599B CN109537599B CN201811172409.6A CN201811172409A CN109537599B CN 109537599 B CN109537599 B CN 109537599B CN 201811172409 A CN201811172409 A CN 201811172409A CN 109537599 B CN109537599 B CN 109537599B
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Abstract
The invention relates to a support replacing structure of a deep foundation pit support system and a construction method, which are characterized in that an annular connecting plate is arranged outside a support pile reinforcement cage, and a hoop connecting body, a pressure dispersion plate and a waist beam positioning groove are arranged at the position of the annular connecting plate; applying prestress to the waist rail and the steel support through the first jacking device and the second jacking device respectively; a supporting and placing hanging groove is arranged on the waist rail; arranging 2-4 rows of steel bar connectors outside the connecting section of the lattice column, and arranging an upper connecting hoop plate, a lower connecting hoop plate and a connecting inner support at the position of a steel support; the post-cast strip end die is subjected to jacking positioning through an internal positioning body inside the post-cast strip reinforcement cage, and a closed baffle is arranged at the position of the post-cast strip; and arranging a waterproof plate on the side of the basement outer wall facing the support pile. The invention can not only improve the positioning precision and the installation construction efficiency of the waist rail, but also improve the integrity and the strength of the support replacing system and reduce the difficulty of the post-cast strip sealing construction.
Description
Technical Field
The invention relates to a construction method of a deep foundation pit support replacing structure, in particular to a deep foundation pit support replacing structure and a construction method with high construction efficiency, strong integrity and small environmental influence, belongs to the field of foundation and foundation engineering, and is suitable for deep foundation pit support replacing engineering.
Background
After the construction of underground building structures such as building foundations, basement exterior walls and the like is completed, the inner supports of the support piles are usually required to be dismantled so as to facilitate the construction of upper structures. Because the inner support is dismantled to influence the stress and deformation of the support pile, the deep foundation pit support system support replacement construction is usually required in the engineering. The common support changing method comprises the support changing of profile steel or the support changing of a reinforced concrete structure, although the method can meet the requirement of load transmission to a certain extent, the method is influenced by a plurality of factors such as construction environment, construction process and technical level, the problems of high construction difficulty, poor integrity of a support changing system, difficult installation and positioning of waist beams and the like exist in actual construction fashion, the construction efficiency is seriously influenced, and the construction quality of the deep foundation pit of the building engineering is reduced.
The support replacing construction technology for the deep foundation pit engineering support system is characterized in that the support scheme adopted by engineering is a double-spliced I-shaped steel waist beam and steel pipe inner support system, double-spliced I-shaped steel is adopted as a steel waist beam at the side close to a foundation pit retaining wall pile, and an inner support hanging plate is installed at the corresponding position by combining the main body structure at the other side; when the steel waist beam is constructed, the total station is used for emitting an inner support mounting positioning line, a supporting pile retaining wall is ground, the steel waist beam support is mounted, and after all the steel waist beam supports are checked and accepted, the steel waist beam is mounted and fixed, and lattice column construction is carried out after the check and acceptance is completed. Although the construction method constructs the deep foundation pit support replacing system, the site construction process is complex, the positioning difficulty of the waist rail is high, the integrity of the support replacing system is poor, and the problem of post-cast strip assembly type sealing is not involved.
In summary, although the existing construction method obtains a better construction effect under a proper working condition, the existing construction method has defects in the aspects of waist rail refinement, structural integrity improvement, construction efficiency improvement and the like. In view of this, in order to improve the efficiency and quality of the support replacement construction of the deep foundation pit support system, the invention of the support replacement structure and the construction method of the deep foundation pit support system, which can not only improve the positioning accuracy and the installation construction efficiency of the waist rail, but also improve the integrity and the strength of the support replacement system and reduce the difficulty of the post-cast strip closing construction, is urgently needed.
Disclosure of Invention
The invention aims to provide a deep foundation pit support system support changing structure and a construction method, which can improve the positioning accuracy and the mounting construction efficiency of a waist rail, improve the integrity and the strength of a support changing system and reduce the sealing construction difficulty of a post-cast strip.
In order to realize the technical purpose, the invention adopts the following technical scheme:
the construction method of the support replacing structure of the deep foundation pit support system is characterized by comprising the following construction steps:
1) constructing a foundation pit supporting pile: arranging an annular connecting plate outside a reinforcing cage of the supporting pile at the height of the waist rail, and presetting a connecting bolt on the annular connecting plate; the top of the structural pile is provided with a connecting section of the lattice column, and the outer side of the connecting section of the lattice column is provided with a row of steel bar connecting bodies, so that the steel bar limiting grooves on the steel bar connecting bodies are firmly connected with the steel reinforcement cage of the structural pile;
2) excavating a foundation pit soil body: after the foundation pit supporting pile forms strength, performing foundation pit soil excavation construction;
3) construction of a basement bottom plate: an internal positioning body is arranged inside a post-cast strip steel bar cage of a basement bottom plate, a position adjusting body is arranged between the internal positioning body and a post-cast strip end mold, and a steel bar passing groove and a grout stopping body are arranged on the post-cast strip end mold; a sealing baffle is arranged on the empty surface of the internal positioning body;
4) waist rail constant head tank sets up: arranging a waist rail hoop, a hoop connecting body, a pressure dispersion plate and a waist rail positioning groove at the position corresponding to the position of the annular connecting plate on the outer side of the support pile (1), arranging a vertical plate on the waist rail positioning groove, arranging a transverse fastening bolt on the vertical plate, and arranging a reinforcing rib body at the bottom of the waist rail positioning groove;
5) and (3) lattice column construction: the lattice column at the upper part is firmly connected with the connecting section of the lattice column, an upper connecting hoop plate and a lower connecting hoop plate are arranged at the position of a steel support, a stay cable is arranged on the upper connecting hoop plate, a connecting inner support and a reinforcing inclined support are arranged on the lower connecting hoop plate, and a stay cable connecting ring plate and a ring plate limiting body are arranged on the connecting inner support;
6) waist rail installation and prestress application: the two ends of the waist beam are provided with pressure-bearing cap plates, and the upper part of the waist beam is provided with a hoisting ring; a transverse limiting plate is arranged on the outer side of the pressure-bearing cap plate; arranging a supporting and placing hanging groove at the position where the steel support is arranged, and firmly connecting the supporting and placing hanging groove with the waist rail through a top bolt; hoisting the waist rail into the waist rail positioning groove, and pressing and fastening the waist rail through a transverse fastening bolt on the vertical plate; after all the waist beams are installed, installing a first jacking device to the upper part of the transverse limiting plate of the pressure-bearing cap plate, and applying prestress to the waist beams through the first jacking device;
7) and (3) mounting a steel support: one end of the steel support is arranged in the support shelving hanging groove, the other end of the steel support is connected with the hoop connected with the end part of the inner support, and a wedge-shaped filling body, a second jacking device and a sliding support body are arranged in the support shelving hanging groove; a flexible seam layer is arranged inside the hoop; the wedge-shaped filling body is connected with the supporting and placing hanging groove through a hanging groove bolt;
8) and (3) support replacement construction: the original foundation pit supporting structure is sequentially dismantled from bottom to top, and internal support is provided for the foundation pit through the steel supports, the lattice columns and the waist beams arranged behind;
9) construction of basement exterior walls and waterproof boards: constructing the basement outer wall, and arranging a post-pouring belt of the basement outer wall at a position corresponding to the post-pouring belt of the basement bottom plate; arranging an internal positioning body inside a post-cast strip steel reinforcement cage of the basement outer wall, and arranging a position adjusting body between the internal positioning body and a post-cast strip end mold; a sealing baffle is arranged on the empty surface of the internal positioning body; arranging a waterproof connecting body on the side of the basement outer wall facing the support pile, and connecting a waterproof plate with the waterproof connecting body through a plate bolt;
10) backfilling construction and steel support dismantling: adopting backfill soil to sequentially fill gaps between the outer wall of the basement and the support piles from bottom to top, and synchronously removing steel supports and waist beams at the positions during backfill soil filling construction;
11) post-cast strip construction: and taking down the sealing baffle, removing the restraint of the position adjusting body on the post-cast strip end mold, taking out the post-cast strip end mold and the internal positioning body, and pouring and maintaining the post-cast strip concrete.
Further, the internal positioning body in the step 3) and the step 9) is made of steel or plastic plates or wood, and the cross section of the internal positioning body is I-shaped or
The shape or the shape of a square is that a baffle connecting bolt is arranged on the free surface of the internal positioning body; the position adjusting body adopts a pressure jack or a mechanical bolt.
Step 1), the steel bar connector is positioned at the outer side of the lattice column and uniformly arranged at intervals along the circumferential direction, one end of the steel bar connector is welded with the lattice column, and the other end of the steel bar connector is provided with a steel bar limiting groove; the diameter of the reinforcing steel bar limiting groove is 5-10 mm larger than the longitudinal reinforcing steel bar of the structural pile reinforcement cage.
Step 6) the cross section of the pressure-bearing cap plate is shaped as
The shape is sleeved at the two ends of the waist rail; the cross section of the supporting and placing hanging groove is rectangular or trapezoidal.
And 7) the cross section of the wedge-shaped filling body is in a right trapezoid shape and is formed by welding steel plates.
And 6) and 7) the cross section of the supporting and placing hanging groove is Z-shaped and is formed by rolling a steel plate, and the direction of a bottom plate of the supporting and placing hanging groove is parallel to that of the steel support.
And 9) adopting a steel template or an aluminum alloy template or a wood template as the post-cast strip end mold, and arranging a steel bar passing groove, an adjusting body connecting plate and a grout stopping body on the post-cast strip end mold.
The present invention has the following features and advantageous effects
(1) According to the invention, the annular connecting plate is arranged in the support pile, and the waist beam hoop is arranged on the outer side of the support pile, so that the connecting strength of the waist beam and the support pile can be effectively improved, and the positioning precision of a structural system is improved.
(2) The steel bar connector connected with the steel bar cage of the structural pile is arranged in the structural pile, and is connected with the connecting section of the lattice column, so that the connecting strength of the lattice column and the structural column can be effectively improved.
(3) According to the invention, the upper connecting hoop plate and the lower connecting hoop plate are arranged on the lattice column, and the pulling force and the jacking force are respectively applied to the connecting inner support through the inhaul cable and the reinforcing inclined support, so that the mounting and positioning accuracy and the bearing capacity of the connecting inner support are improved.
(4) The jacking device is arranged at the joint of the waist rail, so that pre-jacking pressure can be applied to the waist rail, and the stress performance of the waist rail is improved.
(5) According to the invention, the support placing hanging groove and the hoop are arranged at the joint of the steel support and the waist beam, so that the difficulty in hoisting and positioning the steel support can be reduced, and the structural integrity is improved.
(6) According to the invention, the closed baffle and the post-cast strip end mold are arranged at the post-cast strip part of the building, and the post-cast strip end mold can be positioned through the internal positioning body, so that not only can the construction quality of the post-cast strip part be improved, but also sundries can be prevented from entering the post-cast strip.
Drawings
FIG. 1 is a schematic view of a support replacement construction structure of a deep foundation pit support system of the invention;
FIG. 2 is a schematic illustration of the layout of the wale of FIG. 1;
FIG. 3 is a schematic view of the transverse waist rail attachment structure of FIG. 2;
FIG. 4 is a schematic diagram of the arrangement of the lattice columns of FIG. 1;
FIG. 5 is a schematic view of the connection structure of the lattice column and the structural pile of FIG. 4
FIG. 6 is a schematic diagram of a post-cast strip construction structure of the present invention;
FIG. 7 is a schematic view of the post-cast strip end mold structure of FIG. 6;
FIG. 8 is a schematic structural section view after the construction of the deep foundation pit engineering of the present invention is completed;
fig. 9 is a construction flow chart of the deep foundation pit supporting system support replacing structure and the construction method of the invention.
In the figure: 1-supporting a pile; 2-waist rail; 3-supporting pile reinforcement cages; 4-a ring-shaped connecting plate; 5-connecting bolts; 6-structural piles; 7-lattice columns; 8-a steel bar connector; 9-reinforcing steel bar limiting groove; 10-structural pile cages; 11-basement floor; 12-post-pouring a steel reinforcement cage; 13-an internal positioning body; 14-post-cast strip end mold; 15-a position adjuster; 16-the bar passes through the slot; 17-stopping the pulp body; 18-a closure flap; 19-wale hoop; 20-a hoop connector; 21-a pressure dispersion plate; 22-a waist rail positioning groove; 23-vertical plates; 24-transverse fastening bolts; 25-steel support; 26-upper connecting strap; 27-lower connection strap; 28-a pull cable; 29-connecting an inner support; 30-reinforcing diagonal bracing; 31-a cable connecting ring plate; 32-ring plate spacing body; 33-a pressure-bearing cap plate; 34-hoisting ring; 35-transverse limiting plate; 36-supporting hanging grooves; 37-a first pressing device; 38-a ferrule; 39-wedge shaped packing; 40-hanging slot bolts; 41-a second jacking device; 42-a gliding support; 43-a flexible seam layer; 44-basement exterior walls; 45-waterproof board; 46-a waterproof connector; 47-plate bolt; 48-backfilling; 49-baffle plate connecting bolts; 50-an adjustment body connection plate; 51-top bolt; 52-reinforcing rib body.
Detailed Description
The design and construction technical requirements of the support piles, the manufacturing and installation construction technical requirements of the support placing hanging grooves, the design and pouring construction technical requirements of concrete mix proportion, the design and construction technical requirements of basement bottom plates and the like are not repeated in the embodiment, and the embodiment of the structure and the method related to the invention is mainly explained.
Fig. 1 is a schematic view of a support changing construction structure of a deep foundation pit support system of the invention, fig. 2 is a schematic view of a layout structure of a wale of fig. 1, fig. 3 is a schematic view of a transverse connection structure of a wale of fig. 2, fig. 4 is a schematic view of a layout structure of lattice columns of fig. 1, fig. 5 is a schematic view of a connection structure of lattice columns and structural piles of fig. 4, fig. 6 is a schematic view of a construction structure of a post-cast strip of the invention, fig. 7 is a schematic view of an end mold structure of the post-cast strip of fig. 6, and fig. 8 is.
Referring to the support replacing structure of the deep foundation pit support system shown in fig. 1 to 8, an annular connecting plate 4 is arranged outside a support pile reinforcement cage 3, and a hoop connecting body 20, a pressure dispersion plate 21 and a waist rail positioning groove 22 are arranged at the position of the annular connecting plate 4; applying prestress to the wale 2 and the steel support 25 through the first jacking device 37 and the second jacking device 41 respectively; the waist beam 2 is provided with a supporting hanging groove 36; 2-4 rows of steel bar connectors 8 are arranged on the outer side of the connecting section of the lattice column 7, and an upper connecting hoop plate 26, a lower connecting hoop plate 27 and a connecting inner support 29 are arranged at the position of a steel support 25; the post-cast strip end die 14 is pressed and positioned through an internal positioning body 13 inside the post-cast strip reinforcement cage 12, and a closed baffle 18 is arranged at the position of the post-cast strip; the basement outer wall 44 is provided with a waterproof plate 45 facing the side of the support pile 1.
The support pile 1 adopts a concrete cast-in-place pile with the diameter of 800 mm; and a supporting pile reinforcement cage 3 is arranged in the supporting pile 1, and the longitudinal reinforcement of the supporting pile reinforcement cage adopts a threaded reinforcement with the diameter of 22 mm.
The wale 2 is rolled by using H-shaped steel with the strength grade of Q235 and the model number of 400 multiplied by 13 multiplied by 21.
The annular connecting plate 4 is formed by rolling a steel plate with the strength grade of Q235 and the thickness of 10mm, and the height of the annular connecting plate is 6 cm.
The connecting bolt 5 is a high-strength bolt with the diameter of 24 mm.
The top of the structural pile 6 is provided with a connecting section of a lattice column 7, 2-4 rows of steel bar connecting bodies 8 are arranged on the outer side of the connecting section of the lattice column 7, and a steel bar limiting groove 9 on each steel bar connecting body 8 is firmly connected with a structural pile steel reinforcement cage 10; the structural pile 6 and the lattice column 7 are of a reinforced concrete structure, the steel bar connector 8 is formed by cutting a steel plate with the thickness of 5mm, the width of the steel bar limiting groove 9 is 30mm, and the longitudinal steel bar of the structural pile steel reinforcement cage 10 adopts a threaded steel bar with the diameter of 22 mm.
An internal positioning body 13 is arranged inside a post-cast strip steel reinforcement cage 12 of a basement bottom plate 11, a position adjusting body 15 is arranged between the internal positioning body 13 and a post-cast strip end mold 14, a steel reinforcement passing groove 16 and a grout stopping body 17 are arranged on the post-cast strip end mold 14, and a sealing baffle 18 is arranged on the empty surface of the internal positioning body 13.
The thickness of the basement bottom plate 11 is 300mm, and commercial concrete with the strength of C35 is poured; the main reinforcement of the post-cast steel reinforcement cage 12 adopts a twisted steel with the diameter of 16 mm; the internal positioning body 13 is made of a plastic plate, the cross section of the internal positioning body is I-shaped, and the height of the internal positioning body is 200 mm. A baffle connecting bolt 49 is arranged on the free surface of the internal positioning body 13, and the baffle connecting bolt 49 is a high-strength bolt with the diameter of 24 mm; the post-cast strip end die 14 is a steel plate die with the thickness of 2 mm; the position adjusting body 15 adopts a pressure jack, and the tonnage is 10 t; the width of the steel bar passing through the groove 16 is 25 mm; the grout stopping body 17 is a rubber plate with the thickness of 2 mm; the sealing baffle 18 is a gluing template with the thickness of 1 cm.
The wale hoop 19 is formed by rolling a steel plate with the strength grade of Q235 and the thickness of 10mm, and the height is 10 cm.
The hoop connector 20 is a high-strength bolt with a diameter of 24 mm.
The pressure dispersion plate 21 is cut from a steel plate having a strength rating of Q235 and a thickness of 10 mm.
The width of the waist rail positioning groove 22 is 300mm, and the height is 300 mm; the bottom of the waist rail positioning groove 22 is provided with a reinforcing rib body 52; the vertical plate 23 is made of a steel plate with the thickness of 10mm, the transverse fastening bolt 24 is made of a bolt with the diameter of 24mm, and the reinforcing rib body 52 is formed by cutting the steel plate with the strength grade of Q235 and the thickness of 10 mm.
The steel support 25 is a steel pipe with a diameter of 100mm and a wall thickness of 2 mm.
The lower and upper tie straps 27, 26 are each rolled from steel sheet of strength grade Q235, thickness 10mm and height 20 cm.
The pull cable 28 is made of a screw or a steel pipe.
The connecting inner support 29 and the reinforcing inclined support 30 are both made of steel pipes with the strength grade of Q235 and the diameter of 100 mm.
The stay cable connecting ring plate 31 and the ring plate limiting body 32 are formed by cutting steel plates with strength grade of Q235 and thickness of 10 mm.
The hoisting ring 34 is made into a ring shape with the diameter of 10cm by adopting a steel bar with the diameter of 10 mm.
The pressure-bearing cap plate 33 is rolled by a steel plate with the strength grade of Q235 and the thickness of 1cm, and has a cross section of
And (4) shaping.
The transverse limiting plate 35 is made of a steel plate with the strength grade of Q235 and the thickness of 10 mm.
The cross section of the supporting and placing hanging groove 36 is rectangular or trapezoidal and comprises a hanging plate bottom plate and a hanging plate vertical plate which are connected in a welding mode.
The first pressing device 37 and the second pressing device 41 adopt a pressure jack with the tonnage of 20 t.
The ferrule 38 is rolled from a steel plate having a strength rating of Q235, a thickness of 1cm and a width of 30 cm.
The cross section of the wedge-shaped filling body 39 is in a right trapezoid shape and is formed by welding steel plates with the strength grade of Q235 and the thickness of 1 cm.
The hanging groove bolt 40 is a high-strength bolt with the diameter of 24 mm.
The sliding support 42 is made of a steel plate having a strength grade of Q235 and a thickness of 10 mm.
The flexible seam layer 43 is cut from a sheet of rubber having a thickness of 2 mm.
The basement exterior wall 44 is a reinforced concrete structure with a concrete strength rating of C30.
The waterproof sheet 45 is a waterproof roll.
The waterproof connector 46 is a rubber plate with a thickness of 2 cm.
The plate bolts 47 are stainless steel bolts having a diameter of 12 mm.
The backfill soil 48 adopts medium sand with good gradation.
The baffle plate connecting bolt 49 and the top bolt 51 are high-strength bolts with the diameter of 24 mm.
The adjusting body connecting plate 50 is formed by cutting a steel plate with the strength grade of Q235 and the thickness of 10 mm.
Fig. 9 is a construction flow chart of the deep foundation pit supporting system support replacing structure and the construction method of the invention. Referring to fig. 9, the construction method of the deep foundation pit supporting system support replacing structure includes the following construction steps:
1) constructing a foundation pit supporting pile 1: arranging an annular connecting plate 4 outside the supporting pile reinforcement cage 3 at the height of the wale 2, and presetting a connecting bolt 5 on the annular connecting plate 4; the top of the structural pile 6 is provided with a connecting section of a lattice column 7, and 2-4 rows of steel bar connectors 8 are arranged on the outer side of the connecting section of the lattice column 7, so that steel bar limiting grooves 9 on the steel bar connectors 8 are firmly connected with a structural pile steel reinforcement cage 10;
2) excavating a foundation pit soil body: after the foundation pit supporting pile 1 is formed to be strong, foundation pit soil body excavation construction is carried out;
3) construction of a basement bottom plate 11: an internal positioning body 13 is arranged inside a post-cast strip steel reinforcement cage 12 of a basement bottom plate 11, a position adjusting body 15 is arranged between the internal positioning body 13 and a post-cast strip end mold 14, and a steel reinforcement passing groove 16 and a grout stopping body 17 are arranged on the post-cast strip end mold 14; a sealing baffle 18 is arranged on the empty surface of the internal positioning body 13;
4) waist rail positioning groove 22 is provided with: a wale hoop 19, a hoop connecting body 20, a pressure dispersion plate 21 and a wale positioning groove 22 are arranged at the corresponding position of the annular connecting plate 4 on the outer side of the support pile 1, a vertical plate 23 is arranged on the wale positioning groove 22, a transverse fastening bolt 24 is arranged on the vertical plate 23, and a reinforcing rib body 52 is arranged at the bottom of the wale positioning groove 22;
5) and (3) constructing a lattice column 7: firmly connecting the upper lattice column 7 with the connecting section of the lattice column 7, arranging an upper connecting hoop plate 26 and a lower connecting hoop plate 27 at the position of a steel support 25, arranging a guy cable 28 on the upper connecting hoop plate 26, arranging a connecting inner support 29 and a reinforcing inclined support 30 on the lower connecting hoop plate 27, and arranging a guy cable connecting ring plate 31 and a ring plate limiting body 32 on the connecting inner support 29;
6) waist rail 2 installation and prestressing: the two ends of the waist rail 2 are provided with pressure-bearing cap plates 33, and the upper part is provided with a hoisting ring 34; a transverse limiting plate 35 is arranged on the outer side of the pressure-bearing cap plate 33; a supporting and placing hanging groove 36 is arranged at the position where the steel support 25 is arranged, and the supporting and placing hanging groove 36 is firmly connected with the waist rail 2 through a top bolt 51; hoisting the wale 2 into the wale positioning groove 22, and pressing and fastening the wale 2 through a transverse fastening bolt 24 on the vertical plate 23; after all the wales 2 are installed, installing the first jacking device 37 to the upper part of the transverse limiting plate 35 of the pressure-bearing cap plate 33, and applying prestress to the wales 2 through the first jacking device 37;
7) and (3) mounting the steel support 25: one end of the steel support 25 is arranged in the support placing hanging groove 36, the other end of the steel support is connected with a hoop 38 connected with the end part of the inner support 29, and a wedge-shaped filling body 39, a second jacking device 41 and a sliding support body 42 are arranged in the support placing hanging groove 36; a flexible seam layer 43 is disposed within the cuff 38; the wedge-shaped filling body 39 is connected with the supporting and placing hanging groove 36 through a hanging groove bolt 40;
8) and (3) support replacement construction: the original foundation pit supporting structure is sequentially dismantled from bottom to top, and internal support is provided for the foundation pit through the steel supports 25, the lattice columns 7 and the waist beams 2 arranged behind;
9) construction of basement outer wall 44 and waterproof board 45: constructing the basement outer wall 44, and arranging a post-pouring belt of the basement outer wall 44 at a position corresponding to the post-pouring belt of the basement bottom plate 11; an internal positioning body 13 is arranged inside a post-cast strip steel reinforcement cage 12 of the basement outer wall 44, and a position adjusting body 15 is arranged between the internal positioning body 13 and a post-cast strip end mold 14; a sealing baffle 18 is arranged on the empty surface of the internal positioning body 13; arranging a waterproof connecting body 46 on the side of the basement outer wall 44 facing the support pile 1, and connecting a waterproof plate 45 with the waterproof connecting body 46 through a plate bolt 47;
10) construction of backfill 48 and dismantling of steel supports 25: adopting backfill 48 to sequentially fill gaps between the basement outer wall 44 and the support piles 1 from bottom to top, and synchronously removing the steel supports 25 and the waist beams 2 at the positions during the filling construction of the backfill 48;
11) post-cast strip construction: and (3) taking down the sealing baffle 18, removing the restraint of the position adjusting body 15 on the post-cast strip end mold 14, taking out the post-cast strip end mold 14 and the internal positioning body 13, and pouring and curing the post-cast strip concrete.
Claims (7)
1. The construction method of the support replacing structure of the deep foundation pit support system is characterized by comprising the following construction steps:
1) constructing a foundation pit supporting pile (1): arranging an annular connecting plate (4) outside a supporting pile reinforcement cage (3) at the height of the waist rail (2), and presetting a connecting bolt (5) on the annular connecting plate (4); the top of the structural pile (6) is provided with a connecting section of the lattice column (7), and 2-4 rows of steel bar connectors (8) are arranged on the outer side of the connecting section of the lattice column (7), so that steel bar limiting grooves (9) on the steel bar connectors (8) are firmly connected with a structural pile steel reinforcement cage (10);
2) excavating a foundation pit soil body: after the foundation pit supporting pile (1) is formed to be strong, foundation pit soil body excavation construction is carried out;
3) construction of a basement bottom plate (11): an internal positioning body (13) is arranged inside a post-cast strip steel reinforcement cage (12) of a basement bottom plate (11), a position adjusting body (15) is arranged between the internal positioning body (13) and a post-cast strip end mold (14), and a steel bar passing groove (16) and a grout stopping body (17) are arranged on the post-cast strip end mold (14); a sealing baffle (18) is arranged on the empty surface of the internal positioning body (13);
4) waist rail constant head tank (22) set up: the outer side of the support pile (1) is provided with a wale hoop (19), a hoop connecting body (20), a pressure dispersion plate (21) and a wale positioning groove (22) at a position corresponding to the position of the annular connecting plate (4), the wale positioning groove (22) is provided with a vertical plate (23), the vertical plate (23) is provided with a transverse fastening bolt (24), and the bottom of the wale positioning groove (22) is provided with a reinforcing rib body (52);
5) constructing the lattice column (7): firmly connecting the lattice column (7) at the upper part with the connecting section of the lattice column (7), arranging an upper connecting hoop plate (26) and a lower connecting hoop plate (27) at the outer side of the lattice column (7), arranging a guy cable (28) on the upper connecting hoop plate (26), arranging a connecting inner support (29) and a reinforcing inclined support (30) on the lower connecting hoop plate (27), and arranging a guy cable connecting ring plate (31) and a ring plate limiting body (32) on the connecting inner support (29);
6) the installation and prestress application of the wale (2) are as follows: pressure-bearing cap plates (33) are arranged at two ends of the waist rail (2), and hoisting rings (34) are arranged at the upper part of the waist rail; a transverse limiting plate (35) is arranged on the outer side of the pressure-bearing cap plate (33); a supporting and hanging groove (36) is arranged at the position where the steel support (25) is arranged; hoisting the waist rail (2) into the waist rail positioning groove (22), and pressing and fastening the waist rail (2) through a transverse fastening bolt (24) on a vertical plate (23); after all the waist beams (2) are installed, a first jacking device (37) is installed on the upper portion of a transverse limiting plate (35) of a pressure-bearing cap plate (33), and prestress is applied to the waist beams (2) through the first jacking device (37); the supporting and placing hanging groove (36) is firmly connected with the waist rail (2) through a top bolt (51);
7) and (3) installing a steel support (25): one end of the steel support (25) is arranged in the support placing and hanging groove (36), the other end of the steel support is connected with a hoop (38) connected with the end part of the inner support (29), and a wedge-shaped filling body (39), a second jacking device (41) and a sliding support body (42) are arranged in the support placing and hanging groove (36); providing a flexible seam layer (43) within the cuff (38); the wedge-shaped filling body (39) is connected with the supporting and placing hanging groove (36) through a hanging groove bolt (40);
8) and (3) support replacement construction: the original foundation pit supporting structure is sequentially dismantled from bottom to top, and internal support is provided for the foundation pit through a steel support (25), a lattice column (7) and a waist beam (2) which are arranged at the back;
9) construction of basement outer walls (44) and waterproof plates (45): constructing the basement outer wall (44), and arranging a post-pouring belt of the basement outer wall (44) at a position corresponding to the post-pouring belt of the basement bottom plate (11); an internal positioning body (13) is arranged inside a post-cast strip steel reinforcement cage (12) of a basement outer wall (44), so that a position adjusting body (15) is arranged between the internal positioning body (13) and a post-cast strip end mold (14); a sealing baffle (18) is arranged on the empty surface of the internal positioning body (13); arranging a waterproof connecting body (46) on the side of the basement outer wall (44) facing the support pile (1), and connecting a waterproof plate (45) with the waterproof connecting body (46) through a plate bolt (47);
10) constructing backfill (48) and dismantling the steel support (25): sequentially filling gaps between the outer wall (44) of the basement and the support piles (1) with backfill soil (48) from bottom to top, and synchronously removing steel supports (25) and waist beams (2) at positions to be backfilled during backfill soil (48) filling construction;
11) post-cast strip construction: and (3) taking down the sealing baffle (18), releasing the restraint of the position adjusting body (15) on the post-cast strip end mold (14), taking out the post-cast strip end mold (14) and the internal positioning body (13), and pouring and maintaining the post-cast strip concrete.
2. The construction method according to claim 1, characterized in that: step 3) and step 9) the internal positioning body (13) is made of steel or plastic plates or wood, the cross section of the internal positioning body is I-shaped or ㄷ -shaped or mouth-shaped, and a baffle plate connecting bolt (49) is arranged on the free surface of the internal positioning body (13); the position adjusting body (15) adopts a pressure jack or a mechanical bolt.
3. The construction method according to claim 1, characterized in that: step 1), the steel bar connecting bodies (8) are positioned on the outer sides of the lattice columns (7) and are uniformly arranged at intervals along the circumferential direction, one ends of the steel bar connecting bodies (8) are welded with the lattice columns (7), and the other ends of the steel bar connecting bodies are provided with steel bar limiting grooves (9); the diameter of the steel bar limiting groove (9) is 5-10 mm larger than the longitudinal steel bar of the structural pile steel reinforcement cage (10).
4. The construction method according to claim 1, characterized in that: step 6), the cross section of the pressure-bearing cap plate (33) is in the shape of ㄷ and is sleeved at the two ends of the waist rail (2); the cross section of the supporting hanging groove (36) is rectangular or trapezoidal.
5. The construction method according to claim 1, characterized in that: and 7), the cross section of the wedge-shaped filling body (39) is in a right trapezoid shape and is formed by welding steel plates.
6. The construction method according to claim 1, characterized in that: and 6) and 7), the cross section of the supporting and placing hanging groove (36) is Z-shaped and is formed by rolling a steel plate, and the direction of a bottom plate of the supporting and placing hanging groove is parallel to that of the steel support (25).
7. The construction method according to claim 1, characterized in that: and 9), adopting a steel template or an aluminum alloy template or a wood template as the post-cast strip end mold (14), and arranging a steel bar passing groove (16), an adjusting body connecting plate (50) and a grout stopping body (17) on the post-cast strip end mold (14).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101300078B1 (en) * | 2011-10-10 | 2013-08-23 | 삼정건설 주식회사 | Variable supporting device for sheathing work pile |
| CN106013172A (en) * | 2016-07-01 | 2016-10-12 | 杭州江润科技有限公司 | Double row pile and diagonal brace combined soft soil deep foundation pit supporting structure and construction method |
| CN108005084A (en) * | 2017-11-29 | 2018-05-08 | 杭州江润科技有限公司 | The supporting of deep basal pit combined type and construction method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101300078B1 (en) * | 2011-10-10 | 2013-08-23 | 삼정건설 주식회사 | Variable supporting device for sheathing work pile |
| CN106013172A (en) * | 2016-07-01 | 2016-10-12 | 杭州江润科技有限公司 | Double row pile and diagonal brace combined soft soil deep foundation pit supporting structure and construction method |
| CN108005084A (en) * | 2017-11-29 | 2018-05-08 | 杭州江润科技有限公司 | The supporting of deep basal pit combined type and construction method |
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