GB2171741A

GB2171741A - Multi section pile

Info

Publication number: GB2171741A
Application number: GB08504915A
Authority: GB
Inventors: Peter Anderson Kennedy
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-02-26
Filing date: 1985-02-26
Publication date: 1986-09-03
Also published as: GB2171741B; GB8604897D0; GB8504915D0

Abstract

A multi-section pile system has connecting means for the pile sections (1) comprising a pin (7) secured to one of the sections (1) for a portion (7A) to project axially from an end of the section (1) for location in a female socket (8) in an adjoining pile section (1). Removable securing means comprising a securing pin (9) is provided to secure said projecting portion (7A) in the female socket (8), the pin (9) being received in aligned bores (10,11) in the projecting pin portion and in said adjoining pile section (1). <IMAGE>

Description

SPECIFICATION Pile system The present invention relates to a multi-section pile system, and more especially to connecting means for the pile sections in this system.

A prior multi-section pile system comprised reinforced concrete section members of square cross-sectional form, and these section members were connected by joints comprising steel lined female bores in the ends of the concrete members and removable male pins inserted into the female bores of adjoining section to link sections. It is an object of the present invention to provide improved section connecting means in such a pile system.

According to the present invention there is provided in a multi-section pile system, connecting means for the pile sections comprising a pin secured to one of the sections and having a portion projecting axially from an end of the section, said projecting portion of the pin fitting into a female socket in an adjoining pile section.

Preferably removable securing means are provided to secure said projecting portion in the female socket. In a preferred embodiment the securing means comprises a removable pin received in aligned bores in the projecting pin portion and said adjoining pile section.

Preferably, the pile sections are of reinforced concrete form, and the pin is cast in situ in said one section. Preferably further, the concrete sections include reinforcing end plates, and said pin is fixedly secured to an end plate of the one section, for example, by welding.

An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings wherein Figure 1 shows a single pile section of a multi-part pile system in accordance with the present invention; Figure 2 shows to a larger scale the end joint or connection between two of the sections of Fig. 1; and Figure 3 shows a cross-sectional view through section A-A in Fig. 1.

Referring to the drawings, a multi-section pile system includes a series of sections each comprising an elongate reinforced-concrete member 1 having main longitudinal steel reinforcing rods 2 (Fig. 3) and annular reinforcements or stirrups 3. The elongate member 1 is of square cross-section, and square-form steel reinforcing plates 4 are provided at the ends of each member 1. Additionally, steel collars 5 (Fig. 2) serve for further reinforcement at the section ends.

Adjoining pile sections (1) are connected by joint means 6 (Fig. 2) comprising a square section pin 7 cast in situ into one end of a section 1 and having an axially projecting portion 7A which is received in a female socket 8 in the adjacent end of the adjoining section.

The pin 7 comprises a steel tube filled with concrete, but other forms of pin are of course possible. The socket 8 is formed by a squaresection steel tube cast into said adjacent section end, and the pin 7 is secured in the socket 8 by means of a securing pin 9 which can slide between aligned open-ended tubes 10 cast in the section 1 so as to extend transversely to the socket 8 with open ends of the tubes 10 aligning with apertures in the socket tube. The projecting portion 7A of the pin includes a transverse steel lined bore 11 to receive the pin 9.

For increased securement of the pin 7, the pin 7 is welded to the respective end plate 4 by annular weld 12 (preferably this welding is carried out prior to casting of the elongate member 1). In the example shown, each member 1 includes a pin 7 at one end and a socket 8 at the other, i.e. the sections of the pile system are similar, but it would be possible to have a pile system embodying the present invention having successive sections of solely male or female form with respectively pins at both ends or sockets at both ends.

During the piling operation, each new section is fitted to the preceding section by the joint 6 with the pin 9 fitted prior to pile driving in the new section. In contrast to the prior pile arrangement, the joint 6 can withstand tension loading due to the securement of the pin 7 at both ends.

Due to the nature of the securement of the pin 7 in the present pile joint, the joint will be stronger and more rigid than that of the aforesaid prior art pile system. Also, the present pile joint system dispenses with one of the two facing female section ends of the prior system, and consequently economies are provided since the expense of installing one of the female socket tubes in a section end is avoided. The elongate section member 1 could have a square outside size of 255mmX255mm, and by way of example the pin 7 could comprise a square 70mm steel tube of length 800mm, with a 40mm pin portion embedded into the respective pile section end: the female socket 8 in this case will comprise a 80mm square steel tube.

1. In a multi-section pile system, connecting means for the pile sections comprising a pin secured to one of the sections and having a portion projecting axially from an end of the section, said projecting portion of the pin fitting into a female socket in an adjoining pile section.

2. Multi-section pile system as claimed in Claim 1, wherein removable securing means are provided to secure said projecting portion in the female socket.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pile system The present invention relates to a multi-section pile system, and more especially to connecting means for the pile sections in this system. A prior multi-section pile system comprised reinforced concrete section members of square cross-sectional form, and these section members were connected by joints comprising steel lined female bores in the ends of the concrete members and removable male pins inserted into the female bores of adjoining section to link sections. It is an object of the present invention to provide improved section connecting means in such a pile system. According to the present invention there is provided in a multi-section pile system, connecting means for the pile sections comprising a pin secured to one of the sections and having a portion projecting axially from an end of the section, said projecting portion of the pin fitting into a female socket in an adjoining pile section. Preferably removable securing means are provided to secure said projecting portion in the female socket. In a preferred embodiment the securing means comprises a removable pin received in aligned bores in the projecting pin portion and said adjoining pile section. Preferably, the pile sections are of reinforced concrete form, and the pin is cast in situ in said one section. Preferably further, the concrete sections include reinforcing end plates, and said pin is fixedly secured to an end plate of the one section, for example, by welding. An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings wherein Figure 1 shows a single pile section of a multi-part pile system in accordance with the present invention; Figure 2 shows to a larger scale the end joint or connection between two of the sections of Fig. 1; and Figure 3 shows a cross-sectional view through section A-A in Fig. 1. Referring to the drawings, a multi-section pile system includes a series of sections each comprising an elongate reinforced-concrete member 1 having main longitudinal steel reinforcing rods 2 (Fig. 3) and annular reinforcements or stirrups 3. The elongate member 1 is of square cross-section, and square-form steel reinforcing plates 4 are provided at the ends of each member 1. Additionally, steel collars 5 (Fig. 2) serve for further reinforcement at the section ends. Adjoining pile sections (1) are connected by joint means 6 (Fig. 2) comprising a square section pin 7 cast in situ into one end of a section 1 and having an axially projecting portion 7A which is received in a female socket 8 in the adjacent end of the adjoining section. The pin 7 comprises a steel tube filled with concrete, but other forms of pin are of course possible. The socket 8 is formed by a squaresection steel tube cast into said adjacent section end, and the pin 7 is secured in the socket 8 by means of a securing pin 9 which can slide between aligned open-ended tubes 10 cast in the section 1 so as to extend transversely to the socket 8 with open ends of the tubes 10 aligning with apertures in the socket tube. The projecting portion 7A of the pin includes a transverse steel lined bore 11 to receive the pin 9. For increased securement of the pin 7, the pin 7 is welded to the respective end plate 4 by annular weld 12 (preferably this welding is carried out prior to casting of the elongate member 1). In the example shown, each member 1 includes a pin 7 at one end and a socket 8 at the other, i.e. the sections of the pile system are similar, but it would be possible to have a pile system embodying the present invention having successive sections of solely male or female form with respectively pins at both ends or sockets at both ends. During the piling operation, each new section is fitted to the preceding section by the joint 6 with the pin 9 fitted prior to pile driving in the new section. In contrast to the prior pile arrangement, the joint 6 can withstand tension loading due to the securement of the pin 7 at both ends. Due to the nature of the securement of the pin 7 in the present pile joint, the joint will be stronger and more rigid than that of the aforesaid prior art pile system. Also, the present pile joint system dispenses with one of the two facing female section ends of the prior system, and consequently economies are provided since the expense of installing one of the female socket tubes in a section end is avoided. The elongate section member 1 could have a square outside size of 255mmX255mm, and by way of example the pin 7 could comprise a square 70mm steel tube of length 800mm, with a 40mm pin portion embedded into the respective pile section end: the female socket 8 in this case will comprise a 80mm square steel tube. CLAIMS

3. Multi-section pile system as claimed in Claim 2, wherein the securing means comprises a removable securing pin received in aligned bores in the projecting pin portion and said adjoining pile section.

4. Multi-section pile system as claimed in Claims 1, 2 or 3, wherein the pile sections are of reinforced concrete form, and the pin is cast in situ in said one section.

5. Multi-section pile system as claimed in Claim 4, wherein the concrete sections include reinforcing end plates, and said pin is fixedly secured to an end plate of the one section.

6. Multi-section pile system as claimed in Claim 5, wherein the pin is fixedly secured by welding to said metal end plate of the one section.

6. Multi-section pile system as claimed in Claim 5, wherein the pin is a metal tube filled with concrete, the tube being fixedly secured by welding to said metal end plate of the one section.

7. Multi-section pile system as claimed in any one of the preceding claims, wherein a metal collar is provided to reinforce each section.

8. Multi-section pile system as claimed in Claim 7, wherein the collar is secured to the reinforcing plate.

9. Multi-section pile system substantially as hereinbefore described with reference to the accompanying drawings.

CLAIMS Amendments to the claims have been filed, and have the following effect: Claims 1 and 6 above have been deleted or textually amended.

New or textuaily amended claims have been filed as follows:-

1. In a multi-section pile system, connecting means for the pile sections comprising a pin which is a concrete filled metal box section secured to one of the sections and having a portion projecting axially from an end of the section, said projecting portion of the pin fitting into a female socket in an adjoining pile section, wherein the total shear resistance of the box section is balanced to the tensile strength of the pin.