CN111945766A - Deep foundation pit raft foundation steel bar reverse construction method - Google Patents
Deep foundation pit raft foundation steel bar reverse construction method Download PDFInfo
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- CN111945766A CN111945766A CN202010643949.9A CN202010643949A CN111945766A CN 111945766 A CN111945766 A CN 111945766A CN 202010643949 A CN202010643949 A CN 202010643949A CN 111945766 A CN111945766 A CN 111945766A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
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Abstract
The invention discloses a deep foundation pit raft foundation steel bar reverse construction method, wherein the deep foundation pit is divided into four reverse construction areas from outside to inside and from top to bottom, and the method comprises the following steps: blanking the reinforcing steel bars; constructing a first reverse-construction area bottom rib; constructing bottom ribs of a second reverse construction area; measuring a pay-off control elevation; constructing a steel bar support system in a first reverse-construction area and a second reverse-construction area; performing gluten construction in a first reverse-making area; constructing bottom ribs of a second reverse construction area; fourth, reverse construction of regional steel bars is conducted; thirdly, constructing bottom bars of the reverse construction area; constructing a third reverse-construction area steel bar support system; performing gluten construction in a third reverse-making area, and checking and accepting; the construction area is divided into a plurality of areas, and raft foundation steel bar construction is carried out by adopting an inverse method, so that multi-process alternate construction is realized; support the support body and strengthen the diagonal draw bar through encrypting, improve support body design factor of safety to rationally dispose the workman, increase on-the-spot warning facility, realize deep basal pit raft foundation reinforcing bar safety, high-efficient construction.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a reverse construction method for deep foundation pit raft foundation steel bars.
Background
Through carrying out construction measures such as concrete placement under water, strong drainage, cutting, slip casting, pile extension to the foundation ditch, the foundation ditch infiltration is effectively sealed, because of concrete cutting, pile extension time are long, flood season water level rises gradually, for accelerating basic construction progress, ensure that the basis pours as early as possible smoothly, combine 1# building raft structure form, the comprehensive design, raft foundation reinforcing bar adopts from top to bottom to do the construction, the multiple operation interlude is under construction simultaneously, nevertheless on-the-spot still has following problem:
(1) in rainy season, the water level of Yangtze river rises quickly and the construction period is short.
(2) The raft foundation is thicker and the amount of reinforcing bars is large, the reverse-acting support frame body is not closed, and the integrity is poorer.
(3) The foundation gluten construction is from outside to inside, and central authorities are unsettled, and workman's construction safety risk is high.
(4) The foundation has high reinforcement content, dense reinforcement, large diameter, more foundation steps and irregular pile foundation anchor bars.
Therefore, how to solve the above problems becomes a focus of research by those skilled in the art.
Disclosure of Invention
The invention aims to provide a deep foundation pit raft foundation steel bar reverse construction method, and aims to solve the problems that foundation pit dewatering difficulty is high, foundation steel bar construction difficulty is high when reverse construction needs to be adopted, and operation efficiency is affected due to difficulty in building a support frame.
Based on the technical problems, the technical scheme adopted by the invention is as follows: a deep foundation pit raft foundation steel bar reverse construction method comprises the steps that a deep foundation pit is divided into four reverse construction areas from outside to inside and from top to bottom, wherein an elevator shaft area at the lowest position of the foundation pit is a third reverse construction area, an area around the upper portion of an elevator shaft is a second reverse construction area, the periphery of the second reverse construction area is a first reverse construction area, the periphery of the first reverse construction area is a fourth reverse construction area, and a post-cast strip is further arranged on the outermost periphery of the deep foundation pit;
the method specifically comprises the following steps:
s1, blanking the reinforcing steel bars;
s2, constructing bottom bars of the first reverse construction area;
s3, constructing bottom bars of a second reverse-construction area;
s4, measuring the control elevation of the paying-off;
s5, constructing a steel bar bracket system in the first reverse-construction area and the second reverse-construction area;
s6, performing gluten construction in a first reverse-making area;
s7, constructing bottom bars of a second reverse-construction area;
s8, constructing reinforcing steel bars in a fourth reverse construction area;
s9, constructing bottom bars of a third reverse-construction area;
s10, constructing a third reverse-construction area steel bar support system;
s11, performing gluten construction in a third reverse-making area;
and S12, checking and accepting.
Furthermore, the bottom ribs and the gluten in the reverse-acting area are both configured into bidirectional phi 26mm reinforcing steel bars with the spacing of 150 mm.
Further, a 3-meter raft area is arranged at the bottom of the first reverse-making area, and in step S5, construction of a first basic steel bar support of the first reverse-making area is further performed, wherein the first basic steel bar support of the 3-meter raft area comprises 8# channel steel upright columns which are arranged in a 1.9m by 1.9m rectangular mode, 0.4m channel steel bases are arranged at the bottoms of the 8# channel steel upright columns, 8# channel steel cross bars are arranged at the tops of the 8# channel steel upright columns, a plurality of rows of phi 18mm diagonal bars and a layer of phi 18mm horizontal tie bars are welded in the longitudinal and transverse directions of the 8# channel steel upright columns, the phi 18mm horizontal tie bars are arranged at positions 1.5m higher than the 0.4m channel steel bases, the distance between the phi 18mm horizontal tie bars and the 8# channel steel cross bars is actually set, and the 0.4m channel steel bases are welded on bottom bars; the top 8# channel steel cross bar is continuously communicated and touches the raft plate edge structure.
Further, a 4-meter raft plate area is arranged at the bottom of the second reverse-machining area, and in step S5, construction of a second basic steel bar support of the second reverse-machining area is further performed, wherein the second basic steel bar support of the 4-meter raft plate area comprises 8# channel steel upright columns which are arranged in a 1.9m x 1.9m rectangular mode, 0.4m channel steel bases are arranged at the bottoms of the 8# channel steel upright columns, 8# channel steel cross bars are arranged at the tops of the 8# channel steel upright columns, multiple rows of phi 18mm diagonal bars and two layers of phi 18mm horizontal tie bars are welded longitudinally and transversely to the 8# channel steel upright columns, the lower layer of phi 18mm horizontal tie bars are arranged at positions 1.5m higher than the 0.4m channel steel bases, the distance between the lower layer of phi 18mm horizontal tie bars and the upper layer of phi 18mm horizontal tie bars is 1.5m, and the distance between the phi 18mm horizontal tie bars and the 8# channel steel cross bars is actually set, and 0.4m channel; the top 8# channel steel cross bar is continuously communicated and touches the raft plate edge structure.
Further, in step S10, constructing a third foundation steel bar support in the third reverse-construction area 3, where the third foundation steel bar support includes 20# i-steel columns arranged in a rectangular manner with a minimum spacing of 2m × 2m, a 0.6m channel steel base is arranged at the bottom of the 20# i-steel column, and the 0.6m channel steel base is welded to the bottom rib; welding a plurality of layers of 8# channel steel cross rods in the vertical direction of the 20# I-steel upright column, wherein the distance between the 8# channel steel cross rods is gradually increased from bottom to top, the distance is not more than two meters, and the 8# channel steel cross rods arranged at the top are continuously communicated and contact with a raft edge structure; and a plurality of rows of diagonal braces with the diameter of 18mm are welded in the longitudinal direction and the transverse direction of the 20# I-steel upright post.
Further, still make regional juncture in first contrary in the contrary region of doing of second before step S2, and the second is contrary to doing regional juncture and the regional juncture of third is provided with and faces frontier defense guardrail, include the long protection stand of welding 1.5m on 8# channel-section steel stand, protection stand adopts phi 25mm reinforcing bar, wherein, protection stand is 300mm with 8# channel-section steel stand weld zone coincidence interval, set up two welding points, and set up two-layer horizontal railing at protection stand, horizontal railing adopts phi 25mm reinforcing bar, set up the safety warning area on facing frontier defense guardrail, wait to face to cut off after the empty regional gluten construction.
Further, in step S4, the control elevation of the paying-off is measured to ensure that the thickness of the concrete protective layer is 30-40mm and the thickness of the concrete protective layer on the upstream surface is 50 mm.
Furthermore, the bottom ribs and the gluten at the basic step changing and corner parts of each reverse processing area are mutually anchored.
Compared with the prior art, the invention has the following beneficial technical effects: the construction area is divided into a plurality of areas, and raft foundation steel bar construction is carried out by adopting an inverse method, so that multi-process alternate construction is realized; support the support body and strengthen the diagonal draw bar through encrypting, improve support body design factor of safety to rationally dispose the workman, increase on-the-spot warning facility, realize deep basal pit raft foundation steel bar's safety, high-efficient construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a plan view of a construction area of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a schematic view of a 4 meter raft area and a 3 meter raft area of the present invention;
fig. 4 is a structural diagram of a 4m raft foundation steel bar support system of the invention;
fig. 5 is a second structural view of a 3 m raft foundation steel bar support system of the invention;
FIG. 6 is a three-structure diagram of a steel bar support system of the foundation of the elevator pit;
figure 7 is a block diagram of the frontier guardrail of the present invention.
Description of reference numerals: 1. a first inversion region; 2. the steel structure comprises a second reverse-construction area, a third reverse-construction area, a fourth reverse-construction area, a 5 post-cast strip, a 6.4 m raft plate area, a 7.3 m raft plate area, an 8.8# channel steel upright post, a 9.8# channel steel cross bar, a 10 # phi 18mm diagonal brace, an 11 # phi 18mm horizontal brace, an 12.0.4m8# channel steel base, a 13.20# I-steel upright post, a 14.0.6m8# channel steel base, a 15-horizontal rail, a 16-welding point and a 17-protection upright post.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
A deep foundation pit raft foundation steel bar reverse construction method comprises the steps that steel bar reverse construction is divided into four reverse construction areas from outside to inside and from top to bottom, wherein an elevator shaft area at the lowest position of a foundation pit is a third reverse construction area 3, an area around the upper portion of an elevator shaft is a second reverse construction area 2, the periphery of the second reverse construction area 2 is a first reverse construction area 1, the periphery of the first reverse construction area 1 is a fourth reverse construction area 4, and a post-cast strip 5 is further arranged on the outermost periphery of a deep foundation pit; three reinforcing steel bar processing areas of 15 x 20m are arranged around a main building foundation, wherein the materials of the No. 1 reinforcing steel bar processing area and the No. 2 reinforcing steel bar processing area are dispatched and transported by a 100t truck crane, the materials of the No. 3 reinforcing steel bar processing area are dispatched and transported by a No. 2 tower crane, and the construction organization details are shown in a figure 1 of the reverse-making plane arrangement of the No. 1 building foundation reinforcing steel bars.
The method specifically comprises the following steps as shown in figure 2:
s1, blanking the reinforcing steel bars;
s2, constructing bottom bars in the first reverse construction area 1;
s3, constructing bottom bars in a second reverse construction area 2;
s4, measuring the control elevation of the paying-off;
s5, constructing a steel bar support system in the first reverse-working area 1 and the second reverse-working area 2;
s6, performing gluten construction in a first reverse-making area 1;
s7, constructing bottom bars in a second reverse construction area 2;
s8, constructing the reinforcing steel bars in the fourth reverse construction area 4;
s9, constructing bottom bars in a third reverse construction area 3;
s10, constructing a steel bar bracket system in a third reverse construction area 3;
s11, performing gluten construction in a third reverse-making area 3;
and S12, checking and accepting.
Furthermore, the bottom ribs and the gluten in the reverse-acting area are both configured into bidirectional phi 26mm reinforcing steel bars with the spacing of 150 mm.
Further, as shown in fig. 3 and 4, a 3 m raft plate area 7 is arranged at the bottom of the first reverse-machining area 1, and in step S5, a first construction of a foundation steel bar support of the first reverse-machining area 1 is also performed, wherein the 3 m raft plate area 7 foundation steel bar support comprises a 8# channel steel upright 8 in rectangular arrangement, the space between the 8# channel steel upright 8 is integrally calculated by pin safety software to be 2.2m and 2.2m, so that construction safety can be met, and an integral framework is not formed in reverse construction, so that the 8# channel steel upright 8 of the 3 m raft plate area 7 is arranged according to a 1.9m x 1.9m rectangle, a 0.4m channel steel base 12 is arranged at the bottom of the 8# channel steel upright 8, the 0.4m channel steel base 12 is welded to arrange ribs at the bottom, the welding of the channel steel bases reduces the burning of the bottom steel bars as much as possible, the channel steel columns are effectively connected, a 8# channel steel upright 8 is provided with a cross bar 9 at the top, a plurality of rows of transverse 18mm vertical bars and a layer of 18mm diagonal ribs are, the phi 18mm horizontal tie bar 11 is arranged at a position 1.5m higher than the channel steel base 12 with the distance of 0.4m, and the channel steel base 12 with the distance of phi 18mm from the channel steel cross bar 9 with the distance of 8# is welded on the bottom bar according to actual setting; the top 8# channel steel cross bar 9 is continuous and communicated with the raft plate edge structure.
Further, as shown in fig. 3 and 5, a 4-meter raft area 6 is arranged at the bottom of the second reverse-construction area 2, and in step S5, construction of a second basic steel bar support of the second reverse-construction area 2 is also performed, wherein the second basic steel bar support of the 4-meter raft area 6 comprises 8# channel steel upright columns 8 in 1.9m x 1.9m rectangular arrangement, 0.4m channel steel bases 12 are arranged at the bottom of the 8# channel steel upright columns 8, 0.4m channel steel bases 12 are welded to bottom rows of bars, welding is performed to reduce the burning of bottom plate steel bars as much as possible, effective connection is achieved, 8# channel steel cross bars 9 are arranged at the top of the 8# channel steel upright columns 8, a plurality of rows of 18 mm-diameter diagonal bars 10 and two layers of 18 mm-diameter horizontal tie bars 11 are welded in the longitudinal and transverse directions of the 8# channel steel upright columns 8, the lower layer 18 mm-diameter horizontal tie bar 11 is arranged at a position 1.5m higher than the 0.4m channel steel bases 12, the lower layer 18mm horizontal tie bar 11 and the upper layer tie bar 11 mm, the distance between the phi 18mm horizontal tie bar 11 and the 8# channel steel cross bar 9 is set according to the actual situation, and the channel steel base 12 with the thickness of 0.4m is welded on the bottom bar; the top 8# channel steel cross bar 9 is continuous and communicated with the raft plate edge structure.
Further, as shown in fig. 6, in step S10, a third construction of a third foundation steel bar support in a third reverse-construction area 3 is further performed, where the third foundation steel bar support includes # 20 i-steel columns 13 arranged in a rectangular manner with a minimum distance of 2m × 2m, a 0.6m channel steel base 14 is arranged at the bottom of the # 20 i-steel column 13, the 0.6m channel steel base 14 is welded to a bottom rib, the 0.6m channel steel base 14 is welded to a bottom row rib, and the welding minimizes the burning of bottom plate steel bars and is effective in connection; welding multiple layers of 8# channel steel cross rods 9 in the vertical direction of the 20# I-steel upright columns 13, wherein the distance between the 8# channel steel cross rods 9 is gradually increased from bottom to top, the distance is not more than two meters, and the 8# channel steel cross rods 9 arranged at the tops are continuously communicated and touch the raft edge structure; and a plurality of rows of diagonal braces 10 with the diameter of 18mm are welded in the longitudinal direction and the transverse direction of the 20# I-shaped steel upright post 13.
Further, as shown in fig. 7, before step S2, a boundary between the first reverse-making area 1 and the second reverse-making area 2 and a boundary between the second reverse-making area 2 and the third reverse-making area 3 are provided with an edge protection guardrail, including welding a 1.5m long protection column 17 on the 8# channel steel column 8, wherein the protection column 17 adopts a steel bar with a diameter of 25mm, wherein the overlapping distance between the protection column 17 and the 8# channel steel column 8 is 300mm, providing two welding points 16, providing two layers of horizontal railings 15 on the protection column 17, the horizontal railings 15 adopt steel bars with a diameter of 25mm, providing a safety warning band on the edge protection guardrail, and cutting off gluten in the edge protection area after construction. Safety belts are worn near the reinforcing steel bar construction of the temporary vacant areas, and at least 2 full-time safeners are configured for management
Further, in step S4, the control elevation of the paying-off is measured to ensure that the thickness of the concrete protective layer is 30-40mm and the thickness of the concrete protective layer on the upstream surface is 50 mm.
Furthermore, the bottom ribs and the gluten at the basic step changing and corner parts of each reverse processing area are mutually anchored.
The construction area is divided into a plurality of areas, and raft foundation steel bar construction is carried out by adopting an inverse method, so that multi-process alternate construction is realized; support the support body and strengthen the diagonal draw bar through encrypting, improve support body design factor of safety to rationally dispose the workman, increase on-the-spot warning facility, realize deep basal pit raft foundation steel bar's safety, high-efficient construction.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A deep foundation pit raft foundation steel bar reverse construction method comprises the steps that a deep foundation pit is divided into four reverse construction areas from outside to inside and from top to bottom, wherein an elevator shaft area at the lowest position of the foundation pit is a third reverse construction area (3), an area around the upper portion of the elevator shaft is a second reverse construction area (2), the periphery of the second reverse construction area (2) is a first reverse construction area (1), the periphery of the first reverse construction area (1) is a fourth reverse construction area (4), and a post-cast strip (5) is further arranged on the outermost periphery of the deep foundation pit;
the method specifically comprises the following steps:
s1, blanking the reinforcing steel bars;
s2, constructing bottom bars in the first reverse-construction area (1);
s3, constructing bottom ribs of the second reverse-construction area (2);
s4, measuring the control elevation of the paying-off;
s5, constructing a steel bar support system in the first reverse-working area (1) and the second reverse-working area (2);
s6, performing gluten construction in the first reverse-making area (1);
s7, constructing bottom ribs of the second reverse-construction area (2);
s8, constructing the reinforcing steel bars in the fourth reverse construction area (4);
s9, constructing bottom ribs of the third reverse construction area (3);
s10, constructing a steel bar bracket system in a third reverse construction area (3);
s11, performing gluten construction in a third reverse-making area (3);
and S12, checking and accepting.
2. The reverse construction method of deep foundation pit raft foundation steel bars according to claim 1, wherein the bottom bars and the gluten in the reverse construction area are both configured as bidirectional phi 26mm steel bars with a distance of 150 mm.
3. The deep foundation pit raft foundation reinforcement reverse construction method according to claim 2, wherein a 3 m raft plate area (7) is arranged at the bottom of the first reverse construction area (1), and in step S5, a foundation reinforcement support first construction of the first reverse construction area (1) is further performed, wherein the foundation reinforcement support first construction of the 3 m raft plate area (7) comprises 8# channel steel columns (8) in a 1.9m x 1.9m rectangular arrangement, a 0.4m channel steel base (12) is arranged at the bottom of the 8# channel steel columns (8), 8# channel steel cross bars (9) are arranged at the top of the 8# channel steel columns (8), a plurality of rows of 18mm diagonal braces (10) and a layer of 18mm horizontal tie bars (11) are welded in the longitudinal and transverse directions of the 8# channel steel columns (8), the 18mm horizontal tie bars (11) are arranged at a position 1.5m higher than the 0.4m channel steel base (12), and the distances between the 18mm horizontal tie bars (11) and the 8mm horizontal tie bars (9) are set according to actual distances of the # channel steel cross bars (9), a channel steel base (12) of 0.4m is welded on the bottom rib; the top 8# channel steel cross bar (9) is continuously communicated and touches the raft plate edge structure.
4. The deep foundation pit raft foundation reinforcement reverse construction method according to claim 2, wherein a 4m raft plate area (6) is arranged at the bottom of the second reverse area (2), and in step S5, construction of a second foundation reinforcement support of the second reverse area (2) is further performed, wherein the second foundation reinforcement support of the 4m raft plate area (6) comprises 8# channel steel columns (8) in a 1.9m x 1.9m rectangular arrangement, a 0.4m channel steel base (12) is arranged at the bottom of the 8# channel steel column (8), 8# channel steel cross bars (9) are arranged at the top of the 8# channel steel columns (8), a plurality of rows of 18mm diagonal reinforcements (10) and two layers of 18mm horizontal reinforcements (11) are welded in the longitudinal and transverse directions of the 8# channel steel columns (8), the lower layer of 18mm horizontal reinforcements (11) are arranged at a position 1.5m higher than the 0.4m channel steel base (12), and the lower layer of 18mm horizontal reinforcements (11) are horizontally spaced from the upper layer of 18mm reinforcements (11) by 1.5m, the distance between the phi 18mm horizontal tie bar (11) and the 8# channel steel cross bar (9) is set according to the actual situation, and a 0.4m channel steel base (12) is welded on the bottom bar; the top 8# channel steel cross bar (9) is continuously communicated and touches the raft plate edge structure.
5. The deep foundation pit raft foundation reinforcement reverse construction method according to claim 2, wherein in step S10, foundation reinforcement support three construction of a third reverse construction area (3) is further performed, wherein the foundation reinforcement support three comprises 20# i-steel columns (13) which are arranged in a rectangle with a minimum spacing of 2m x 2m, 0.6m channel steel bases (14) are arranged at the bottoms of the 20# i-steel columns (13), and the 0.6m channel steel bases (14) are welded on bottom ribs; welding multiple layers of 8# channel steel cross rods (9) in the vertical direction of a 20# I-steel upright post (13), wherein the distance between the 8# channel steel cross rods (9) is gradually increased from bottom to top, the distance is not more than two meters, and the 8# channel steel cross rods (9) arranged at the top are continuously communicated and contact with a raft side structure; and a plurality of rows of diagonal braces (10) with the diameter of 18mm are welded in the longitudinal direction and the transverse direction of the 20# I-shaped steel upright post (13).
6. The deep foundation pit raft foundation reinforcement reverse construction method according to claim 2, wherein a frontier defense guardrail is further arranged at a junction of the first reverse area (1) and the second reverse area (2) and a junction of the second reverse area (2) and the third reverse area (3) before the step S2, the method comprises the steps of welding a 1.5m long protection upright (17) on an 8# channel steel upright (8), adopting phi 25mm reinforcement for the protection upright (17), wherein the superposition distance between the protection upright (17) and the 8# channel steel upright (8) is 300mm, arranging two welding points (16), arranging two layers of horizontal railings (15) on the protection upright (17), adopting phi 25mm reinforcement for the horizontal railings (15), arranging a safety warning belt on the frontier defense guardrail, and cutting off gluten in the frontier defense area after the construction is finished.
7. The reverse construction method of the deep foundation pit raft foundation steel bars according to claim 1, wherein in step S4, the paying-off control elevation is measured to ensure that the thickness of the concrete protective layer is 30-40mm and the thickness of the upstream concrete protective layer is 50 mm.
8. The deep foundation pit raft foundation rebar reverse construction method according to claim 2, wherein bottom bars and gluten at foundation step changing and corner positions of each reverse construction area are mutually anchored.
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| CN202010643949.9A CN111945766A (en) | 2020-07-01 | 2020-07-01 | Deep foundation pit raft foundation steel bar reverse construction method |
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Application publication date: 20201117 |
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